Power Management

S8351

Seiko Instruments Inc

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER

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www.sii-ic.com STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER © SII Semiconductor Corporation, 2002-2010 Rev.3.0_01 The S-8351/8352 Series is a CMOS step-up sw itching regulator controller which main ly consists of a reference voltage source, an oscillation circuit, a comparator and PFM control circuit. The PFM contro l circuit allows the duty ratio to be automatically switched according to the load (at light load : 50%, at high output cu rrent : 75%), enabling products with a low ripple over a wide range, high efficiency, and high output current (A, B, and D type). Products with a fixed duty ratio of 75% are also available (C type). The S-8351 Series can configure a step-up switching regulator with an external coil, capacitor, and di ode. A protection circuit turns off the built-in MOS FET when the voltage at the CONT pin exceeds the limit to prevent it from being damaged. In addition to the above features, the small package and low current consumpti on, makes the S-8351 Series ideal for applications such as the power supply unit of portable equipment. The S-8352 Series, which features an external transistor, is suitable for applications requiring a high output current.  Features

Low voltage operation : Startup at 0.9 V min. (IOUT = 1 mA) guaranteed
Low current consumption : During operation 23.2 μA (VOUT = 3.3 V, typ.) During shutdown 0.5 μA (max.)
Duty ratio : 50 % / 75 % built-in auto-switching-type PFM control circuit (A, B, and D type) 75 % built-in fixed-type PFM control circuit (C type)
External parts : Coil, capacitor, and diode
Output voltage : Selectable in 0.1 V steps between 2.0 V to 6.5 V (A, B, and C type) Selectable in 0.1 V steps between 1.5 V to 6.5 V (D type)
Output voltage accuracy : ±2.4%
Shutdown function (A type)
V DD / VOUT separate type (D type)
External transistor type available (S-8352 Series)
Lead-free, Sn 100%, halogen-free*1 *1. Refer to “ Product Name Structure” for details.  Applications
Power supplies for portable equipment such as digital cameras, electronic notebooks, and PDAs
Power supplies for audio equipment such as portable CD / MD players
Constant voltage power supplies for cameras, video equipment, and communications equipment
Power supplies for microcomputers  Packages
SOT-23-3
SOT-23-5
SOT-89-3

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01  Product Name Structure The product types, output voltage, and pa ckages for the S-8351/8352 Series can be selected at the user’s request. Please refer to the “ 3. Product Name ” for the definition of the product name, “ 4. Package ” regarding the package drawings and “5. Product Name List ” for the full product names. 1. Function List (1) Built-in Power MOS FET Type Table 1 Product Name Controll system Duty ratio [%] Switching frequency [kHz] Shutdown function VDD / VOUT separate type Package Application S-8351AxxMC PFM 50 / 75 100 Yes − SOT-23-5 Applications requiring shutdown function S-8351BxxMA PFM 50 / 75 100 − − SOT-23-3 Applications not requiring shutdown function S-8351CxxMA PFM 75 100 − − SOT-23-3 Applications not requiring shutdown function S-8351CxxUA PFM 75 100 − − SOT-89-3 Applications not requiring shutdown function S-8351DxxMC PFM 50 / 75 100 − Yes SOT-23-5 Applications in which output voltage is adjusted by external resistor (2) External Power MOS FET Type Table 2 Product Name Controll System Duty Ratio [%] Switching Frequency [kHz] Shutdown Function VDD / VOUT Separate Type Package Application S-8352AxxMC PFM 50 / 75 100 Yes − SOT-23-5 Applications requiring shutdown function S-8352BxxMA PFM 50 / 75 100 − − SOT-23-3 Applications not requiring shutdown function S-8352CxxMA PFM 75 100 − − SOT-23-3 Applications not requiring shutdown function S-8352CxxUA PFM 75 100 − − SOT-89-3 Applications not requiring shutdown function S-8352DxxMC PFM 50 / 75 100 − Yes SOT-23-5 Applications in which output voltage is adjusted by external resistor

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series 2. Package and Function List by Product Type Table 3 Series Name Type Package Name (Abbreviation) Shutdown Function Yes / No VDD / VOUT Separate Type Yes / No S-8351 Series, S-8352 Series A (Duty ratio 50% / 75% auto-switching type) A = 100 kHz MC Yes No B (Duty ratio 50% / 75% auto-switching type) B = 100 kHz MA No No C (Duty ratio 75% fixed type) C = 100 kHz MA / UA No No D (Duty ratio 50% / 75% auto-switching type) D = 100 kHz MC No Yes 3. Product Name (1) SOT-23-3 S-835 x x xx MA - xxx T2 G Environmental code G : Lead-free (for details, please contact our sales office) IC direction in tape specifications *1 Product name (abbreviation) *2 Package name (abbreviation) MA : SOT-23-3 Output voltage 15 to 65 (e.g. When the output voltage is 1.5 V, it is expressed as 15.) Product type A : With shutdown function, f OSC = 100 kHz B : 50% / 75% automatic duty ratio switching type, f OSC = 100 kHz C : 75% duty ratio fixed type, f OSC = 100 kHz D : V DD / VOUT separate type, f OSC = 100 kHz Series name 1 : Built-in power MOS FET 2 : External power MOS FET *1. Refer to the tape specifications. *2. Refer to the Table 4, 5 in the “5. Product Name List ”.

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 (2) SOT-23-5, SOT-89-3 S-835 x x xx xx - xxx T2 x Environmental code U : Lead-free (Sn 100%), halogen-free G : Lead-free (for details, please contact our sales office) IC direction in tape specifications *1 Product name (abbreviation) *2 Package name (abbreviation) MC : SOT-23-5 UA : SOT-89-3 Output voltage 15 to 65 (e.g. When the output voltage is 1.5 V, it is expressed as 15.) Product type A : With shutdown function, f OSC = 100 kHz B : 50% / 75% automatic duty ratio switching type, f OSC = 100 kHz C : 75% duty ratio fixed type, f OSC = 100 kHz D : V DD / VOUT separate type, f OSC = 100 kHz Series name 1 : Built-in power MOS FET 2 : External power MOS FET *1. Refer to the tape specifications. *2. Refer to the Table 4, 5 in the “5. Product Name List ”. 4. Package Package Name Drawing Code Package Tape Reel SOT-23-3 MP003-A-P-SD MP003-A-C-SD MP003-A-R-SD SOT-23-5 MP005-A-P-SD MP005-A-C-SD MP005-A-R-SD SOT-89-3 UP003-A-P-SD UP 003-A-C-SD UP003-A-R-SD

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series 5. Product Name List (1) S-8351 Series Table 4 Output voltage S-8351AxxMC Series S-8351BxxMA Series S-8351CxxMA Series S-8351CxxUA Series S-8351DxxMC Series

1.5 V − − − − S-8351D15MC-J8AT2x

2.0 V S-8351A20MC-J2FT2x S-8351B20MA-J4FT2G − − S-8351D20MC-J8FT2x

2.2 V S-8351A22MC-J2HT2x − − − −

2.5 V S-8351A25MC-J2KT2x S-8351B25MA-J4KT2G − S-8351C25UA-J6KT2x −

2.6 V S-8351A26MC-J2LT2x − − − −

2.7 V S-8351A27MC-J2MT2x S-8351B27MA-J4MT2G − − −

2.8 V S-8351A28MC-J2NT2x − − − −

3.0 V S-8351A30MC-J2PT2x S-8351B30MA-J4PT2G − S-8351C30UA-J6PT2x S-8351D30MC-J8PT2x

3.1 V − − − S-8351C31UA-J6QT2x −

3.2 V S-8351A32MC-J2RT2x − − S-8351C32UA-J6RT2x −

3.3 V S-8351A33MC-J2ST2x S-8351B33MA-J4ST2G S-8351C33MA-J6ST2G S-8351C33UA-J6ST2x −

3.5 V S-8351A35MC-J2UT2x − − S-8351C35UA-J6UT2x −

4.0 V S-8351A40MC-J2ZT2x − − − S-8351D40MC-J8ZT2x

4.5 V S-8351A45MC-J3ET2x S-8351B45MA-J5ET2G − − −

4.6 V − S-8351B46MA-J5FT2G − − −

4.7 V S-8351A47MC-J3GT2x − − − −

5.0 V S-8351A50MC-J3JT2x S-8351B50MA-J5JT2G − S-8351C50UA-J7JT2x S-8351D50MC-J9JT2x

5.5 V S-8351A55MC-J3OT2x S-8351B55MA-J5OT2G − − −

5.6 V S-8351A56MC-J3PT2x − − − −

6.0 V S-8351A60MC-J3TT2x − − − S-8351D60MC-J9TT2x

(2) S-8352 Series Table 5 Output voltage S-8352AxxMC Series S-8352BxxMA Series S-8352CxxUA Series S-8352DxxMC Series

2.0 V − − − S-8352D20MC-K8FT2x

2.5 V S-8352A25MC-K2KT2x − − −

3.0 V S-8352A30MC-K2PT2x S- 8352B30MA-K4PT2G S-8352C30UA-K6PT2x S-8352D30MC-K8PT2x

3.1 V − − S-8352C31UA-K6QT2x −

3.2 V S-8352A32MC-K2RT2x − S-8352C32UA-K6RT2x −

3.3 V S-8352A33MC-K2ST2x − S-8352C33UA-K6ST2x S-8352D33MC-K8ST2x

3.5 V S-8352A35MC-K2UT2x − − −

3.7 V S-8352A37MC-K2WT2x − − −

4.0 V S-8352A40MC-K2ZT2x − − −

4.6 V S-8352A46MC-K3FT2x − − −

4.7 V S-8352A47MC-K3GT2x − − −

5.0 V S-8352A50MC-K3JT2x S- 8352B50MA-K5JT2G S-8352C50UA-K7JT2x −

5.4 V S-8352A54MC-K3NT2x − − −

5.6 V − − S-8352C56UA-K7PT2x −

Remark 1. Please contact the SII Semiconductor Corporation mark eting department for products with an output voltage other than those specified above. 2. x: G or U 3. Please select products of environmental code = U for Sn 100%, halogen-free products.

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01  Pin Configurations 2 3 SOT-23-3 Top view Figure 7 Table 6 S-8351 Series B and C Types (Without shutdown function, VDD / VOUT non-separate type) Pin No. Symbol Pin Description

1 VOUT Output voltage pin and IC power supply pin

2 VSS GND pin

3 CONT External inductor connection pin (Open-drain output)

Table 7 S-8352 Series B and C Types (Without shutdown function, VDD / VOUT non-separate type) Pin No. Symbol Pin Description

3 EXT External transistor connection pin (CMOS output)

Table 8 S-8351 Series A Type (With shutdown function, VDD / VOUT non-separate type) Pin No. Symbol Pin Description

1 OFF/ON

“H”: Normal operation (Step-up operating) “L”: Step-up stopped (Entire circuit stopped)

2 VOUT Output voltage pin and IC power supply pin

3 NC*1 No connection

4 VSS GND pin

5 CONT External inductor connection pin (Open-drain output)

Figure 8 *1. The NC pin indicates electrically open. Table 9 S-8352 Series A Type (With shutdown function, VDD / VOUT non-separate type) Pin No. Symbol Pin Description “H”: Normal operation (Step-up operating) “L”: Step-up stopped (Entire circuit stopped)

5 EXT External transistor connection pin (CMOS output)

*1. The NC pin indicates electrically open.

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series Table 10 S-8351 Series D Type (Without shutdown function, VDD / VOUT separate type) Pin No. Symbol Pin Description

1 VOUT Output voltage pin

2 VDD IC power supply pin

*1. The NC pin indicates electrically open. Table 11 S-8352 Series D Type (Without shutdown function, VDD / VOUT separate type) Pin No. Symbol Pin Description *1. The NC pin indicates electrically open. SOT-89-3 Top view 3 2 1 Figure 9 Table 12 S-8351 Series C Type (Without shutdown function, VDD / VOUT non-separate type) Pin No. Symbol Pin Description

1 VSS GND pin

Table 13 S-8352 Series C Type (Without shutdown function, VDD / VOUT non-separate type) Pin No. Symbol Pin Description

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01  Absolute Maximum Ratings Table 14 (Ta = 25°C unless otherwise specified) Item Symbol Absolute maximum rating Unit VOUT pin voltage V OUT V SS − 0.3 to VSS + 12 V OFF/ON pin voltage *1 OFF/ONV VSS − 0.3 to VSS + 12 V VDD pin voltage *2 VDD V SS − 0.3 to VSS + 12 V CONT pin voltage V CONT V SS − 0.3 to VSS + 12 V EXT pin voltage D type VEXT VSS − 0.3 to VDD + 0.3 V Others V SS − 0.3 to VOUT + 0.3 V CONT pin current I CONT 300 mA EXT pin current I EXT ±50 mA Power dissipation SOT-23-3 PD 150 (When not mounted on board) mW 430*3 mW SOT-23-5 250 (When not mounted on board) mW 600*3 mW SOT-89-3 500 (When not mounted on board) mW 1000*3 mW Operating ambient temperature T opr − 40 to + 85 °C Storage temperature T stg − 40 to + 125 °C *1. With shutdown function *2. For VDD / VOUT separate type *3. When mounted on board [Mounted board] (1) Board size : 114.3 mm × 76.2 mm × t1.6 mm (2) Board name : JEDEC STANDARD51-7 Caution The absolute maximum ra tings are rated values exceeding whic h the product could suffer physical damage. These values must therefor e not be exceeded under any conditions. (1) When mounted on board (2) When not mounted on board 0 50 100 150 800 400 Power dissipation (PD) [mW] Ambient temperature (Ta) [°C] 1000 600 200 1200 SOT-23-3 SOT-23-5 SOT-89-3 0 50 100 150 400 200 Power dissipation (PD) [mW] Ambient temperature (Ta) [°C] 500 300 100 600 SOT-23-3 SOT-23-5 SOT-89-3 Figure 10 Power Dissipation of Packages

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series  Electrical Characteristics (1) S-8351 Series Table 15 (1 / 2) (Ta = 25°C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Measurement circuit Output voltage V OUT − VOUT(S) × 0.976 VOUT(S) VOUT(S) × 1.024 V 1 Input voltage V IN − − − 10 V 1 Operation start voltage V ST1 I OUT = 1 mA − − 0.9 V 1 Oscillation start voltage V ST2 No external parts, Voltage applied to VOUT, CONT pin pulled up to VOUT with 300 Ω resistor − − 0.8 V 2 Input current during no- load I IN I OUT = 0 mA S-8351x15 to 29 − 8.5 − μA 1 S-8351x30 to 49 − 9.0 − μA 1 S-8351x50 to 65 − 9.5 − μA 1 Current consumption 1 I SS1 V OUT = VOUT(S) × 0.95 S-8351x15 to 19 − 9.6 16.0 μA 2 S-8351x20 to 29 − 15.7 26.2 μA 2 S-8351x30 to 39 − 23.2 38.6 μA 2 S-8351x40 to 49 − 32.0 53.3 μA 2 S-8351x50 to 59 − 42.1 70.2 μA 2 S-8351x60 to 65 − 54.9 91.5 μA 2 Current consumption 2 I SS2 V OUT = VOUT(S) + 0.5 V S-8351x15 to 19 − 2.3 3.5 μA 2 S-8351x20 to 29 − 2.5 3.8 μA 2 S-8351x30 to 39 − 2.7 4.1 μA 2 S-8351x40 to 49 − 2.9 4.4 μA 2 S-8351x50 to 59 − 3.1 4.7 μA 2 S-8351x60 to 65 − 3.3 5.1 μA 2 Current consumption during shutdown (With shutdown function) I SSS OFF/ONV = 0 V − − 0.5 μA 2 Switching current I SW V CONT = 0.4 V S-8351x15 to 19 50.2 91.2 − mA 2 S-8351x20 to 24 65.0 118.2 − mA 2 S-8351x25 to 29 78.5 142.7 − mA 2 S-8351x30 to 39 90.7 164.8 − mA 2 S-8351x40 to 49 110.9 201.6 − mA 2 S-8351x50 to 59 125.7 228.6 − mA 2 S-8351x60 to 65 135.2 245.8 − mA 2 Switching transistor leakage current ISWQ No external parts, VCONT = VOUT = 10 V, OFF/ONV = 0 V − − 0.5 μA 2 CONT pin limit voltage V CONTLMT Apply to CONT pin, Confirm oscillation stop − 0.9 − V 2 Line regulation ΔVOUT1 V IN = VOUT(S) × 0.4 to × 0.6 − 30 60 mV 1 Load regulation ΔVOUT2 I OUT = 10 μA to VOUT(S) / 250 × 1.25 − 30 60 mV 1 Output voltage temperature coefficient OUT OUT VTa∆ Ta = − 40°C to + 85°C − ±50 − ppm / °C 1 Oscillation frequency f OSC VOUT = VOUT(S) × 0.95, Measured waveform at CONT pin 90 100 110 kHz 2 Duty ratio 1 Duty1 VOUT = VOUT(S) × 0.95, Measured waveform at CONT pin 70 75 80 % 2 Duty ratio 2 (For A, B, D type) Duty2 Measured waveform at CONT pin at light load − 50 − % 1

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 Table 15 (2 / 2) (Ta = 25°C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Measurement circuit OFF/ON pin input voltage (With shutdown function) VSH VOUT = VOUT(S) × 0.95, Measured oscillation at CONT pin 0.75 − − V 2 VSL1 VOUT = VOUT(S) × 0.95, Judged oscillation stop at CONT pin At V OUT≥1.5 V − − 0.3 V 2 VSL2 At V OUT<1.5 V − − 0.2 V 2 OFF/ON pin input current (With shutdown function) ISH OFF/ONV = 10 V − 0.1 − 0.1 μA 2 ISL OFF/ONV = 0 V − 0.1 − 0.1 μA 2 Efficiency EFFI − S-8351x30 − 86 − % 1 S-8351x50 − 88 − % 1 External parts Coil: CDRH6D28-101 (100 μH) of Sumida Corporation Diode: MA2Z748 (Shottky type) of Matsus hita Electric Industrial Co., Ltd. Capacitor: F93 (16 V, 47 μF tantalum type) of Nichicon Corporation VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 250 Ω With shutdown function : OFF/ON pin is connected to V OUT For VDD / VOUT separate type : VDD pin is connected to VOUT pin Remark 1. V OUT(S) specified above is the set output voltage value, and V OUT is the typical value of the actual output voltage. 2. VDD / VOUT separate type A step-up operation is performed from VDD = 0.8 V. However, 1.8 V ≤VDD<10 V is recommended stabilizing the output voltage and oscillation frequency. (V DD≥1.8 V must be applied for products with a set value of less than 1.9 V.)

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series (2) S-8352 Series Table 16 (1 / 2) (Ta = 25°C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Measurement circuit Output voltage V OUT − VOUT(S) × 0.976 VOUT(S) VOUT(S) × 1.024 V 3 Input voltage V IN − − − 10 V 3 Operation start voltage V ST1 I OUT = 1 mA − − 0.9 V 3 Oscillation start voltage V ST2 No external parts, Voltage applied to V OUT − − 0.8 V 4 Current consumption 1 I SS1 V OUT = VOUT(S) × 0.95 S-8352x15 to 19 − 7.4 12.3 μA 4 S-8352x20 to 29 − 12.0 20.0 μA 4 S-8352x30 to 39 − 17.8 29.6 μA 4 S-8352x40 to 49 − 24.7 41.1 μA 4 S-8352x50 to 59 − 32.7 54.5 μA 4 S-8352x60 to 65 − 43.0 71.6 μA 4 Current consumption 2 I SS2 V OUT = VOUT(S) + 0.5 V S-8352x15 to 19 − 2.3 3.5 μA 4 S-8352x20 to 29 − 2.5 3.8 μA 4 S-8352x30 to 39 − 2.7 4.1 μA 4 S-8352x40 to 49 − 2.9 4.4 μA 4 S-8352x50 to 59 − 3.1 4.7 μA 4 S-8352x60 to 65 − 3.3 5.1 μA 4 Current consumption during shutdown (With shutdown function) I SSS OFF/ONV = 0 V − − 0.5 μA 4 EXT pin output current IEXTH V EXT = VOUT − 0.4 V S-8352x15 to 19 − 3.5 − 6.3 − mA 4 S-8352x20 to 24 − 5.2 − 9.4 − mA 4 S-8352x25 to 29 − 6.8 − 12.3 − mA 4 S-8352x30 to 39 − 8.2 − 14.9 − mA 4 S-8352x40 to 49 − 10.7 − 19.4 − mA 4 S-8352x50 to 59 − 12.5 − 22.8 − mA 4 S-8352x60 to 65 − 13.9 − 25.2 − mA 4 IEXTL V EXT = − 0.4 V S-8352x15 to 19 3.8 6.9 − mA 4 S-8352x20 to 24 5.6 10.2 − mA 4 S-8352x25 to 29 7.3 13.3 − mA 4 S-8352x30 to 39 8.9 16.2 − mA 4 S-8352x40 to 49 11.6 21.1 − mA 4 S-8352x50 to 59 13.7 25.0 − mA 4 S-8352x60 to 65 15.3 27.8 − mA 4 Line regulation ΔVOUT1 V IN = VOUT(S) × 0.4 to × 0.6 − 30 60 mV 3 Load regulation ΔVOUT2 I OUT = 10 μA to VOUT(S) / 100 × 1.25 − 30 60 mV 3 Output voltage temperature coefficient OUT OUT VTa∆ Ta = − 40°C to + 85°C − ±50 − ppm / °C 3 Oscillation frequency f OSC VOUT = VOUT(S) × 0.95, Measured waveform at EXT pin 90 100 110 kHz 4 Duty ratio 1 Duty1 VOUT = VOUT(S) × 0.95, Measured waveform at EXT 70 75 80 % 4 Duty ratio 2 (For A, B, D type) Duty2 Measured waveform at EXT pin at light load − 50 − % 3

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 Table 16 (2 / 2) (Ta = 25°C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Measurement circuit OFF/ON pin input voltage (With shutdown function) VSH VOUT = VOUT(S) × 0.95, Measured oscillation at EXT 0.75 − − V 4 VSL1 VOUT = VOUT(S) × 0.95, Judged oscillation stop at EXT pin At V OUT≥1.5 V − − 0.3 V 4 VSL2 At V OUT<1.5 V − − 0.2 V 4 OFF/ON pin input current (With shutdown function) ISH OFF/ONV = 10 V − 0.1 − 0.1 μA 4 ISL OFF/ONV = 0 V − 0.1 − 0.1 μA 4 Efficiency EFFI − S-8352x30 − 83 − % 3 S-8352x50 − 85 − % 3 External parts Coil: CDRH6D28-101 (100 μH) from Sumida Corporation Diode: MA2Z748 (Shottky type) from Matsus hita Electric Industrial Co., Ltd. Capacitor: F93 (16 V, 47 μF tantalum type) from Nichicon Corporation Transistor: CPH3210 from Sanyo Electric Co., Ltd. Base resistor (Rb): 1 k Ω Base capacitor (Cb): 2200 pH (ceramic type) VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 100 Ω With shutdown function : OFF/ON pin is connected to V OUT For VDD / VOUT separate type : VDD pin is connected to VOUT pin Remark 1. V OUT(S) specified above is the set output voltage value, and V OUT is the typical value of the actual output voltage. 2. VDD / VOUT separate type A step-up operation is performed from VDD = 0.8 V. However, 1.8 V ≤VDD<10 V is recommended stabilizing the output voltage and oscillation frequency. (V DD≥1.8 V must be applied for products with a set value of less than 1.9 V.)

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series 2. OFFON/ Pin (Shutdown Pin) (A Type) OFF/ON pin stops or starts step-up operation. Setting the OFF/ON pin to the “L” level stops operation of all the internal circuits and reduces the current consumption significantly. DO NOT use the OFF/ON pin in a floating state because it has the structure shown in Figure 17 and is not pulled up or pulled down internally. DO NOT apply a voltage of between 0.3 V and 0.75 V to the OFF/ON pin because applying such a voltage increases the current consumption. If the shutdown pin is not used, connect it to the VOUT pin. The OFF/ON pin does not have hysteresis. Table 17 OFF/ON pin CR oscillation circuit Output voltage “H” Operation Fixed “L” Stop ≅VIN*1 *1. Voltage obtained by subtracting the voltage drop due to the DC resistance of the inductor and the diode forward voltage from VIN. VSS VOUT OFF/ON Figure 17 OFFON/ Pin Structure

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 3. Operation The following are the basic equations [(1) through (7)] of the step-up switching regulator. (Refer to Figure 18.) OSC CL CONT VIN L Di OFF/ON VOUT Figure 18 Step-Up Switching Regulator Circuit for Basic Equation Voltage at CONT pin at the moment M1 is turned ON (VA) *1 : VA = VS *2 (1) *1. Current flowing through L (IL) is zero. *2. Non-saturated voltage of M1. The change in IL over time : L VV L V dt dI SINLL −== (2) Integration of equation (2) (IL) : t L VVI SIN L •  −= (3) IL flows while M1 is ON (tON). The time of t ON is determined by the oscillation frequency of OSC. The peak current (IPK) after tON : ON SIN PK tL VVI •  −= (4) The energy stored in L is represented by 1/2 • L (IPK)2. When M1 is turned OFF (tOFF), the energy stored in L is emitted through a diode to the output capacitor. Then, the reverse voltage (VL) is generated : VL = (VOUT + VD*1) − VIN (5) *1. Diode forward voltage The voltage at CONT pin rises only by VOUT+VD. The change in the current (IL) flowing through the diode into VOUT during tOFF : L VVV L V dt dI INDOUTLL −+== (6)

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series Integration of the equation (6) is as follows : tL VVVII INDOUT PKL •  −+−= (7) During tON, the energy is stored in L and is not transmitted to V OUT. When receiving the output current (I OUT) from VOUT, the energy of the capacitor (C L) is consumed. As a result, the pin voltage of C L is reduced, and goes to the lowest level after M1 is turned ON (t ON). When M1 is turned OFF, the energy stored in L is transmitted through the diode to CL, and the voltage of C L rises rapidly. V OUT is a time function, and therefore indicates the maximum value (ripple voltage (VP−P) ) when the current flowing through into VOUT and load current (IOUT) match. Next, the ripple voltage is determined as follows. IOUT vs. t1 (time) from when M1 is turned OFF (after tON) to when VOUT reaches the maximum level : INDOUT PKOUT tL VVVII •  −+−= (8) −+•−=∴ INDOUT OUTPK1 VVV L)II(t (9) When M1 is turned OFF (tOFF), IL = 0 (when the energy of the inductor is completely transmitted). Based on equation (7) : PK OFF INDOUT I t VVV L = −+ (10) When substituting equation (10) for equation (9) : OFF PK OUT OFF1 tI Itt • −= (11) Electric charge ΔQ1 which is charged in CL during t1 : INDOUT 1PK INDOUT1t

0 PKL

L VVVtItdtL When substituting equation (12) for equation (9) : () 1 OUTPK 1OUTPKPK t2 IItII2 1I1Q •+=•−−=Δ (13) A rise in voltage (VP−P) due to ΔQ 1 : OUTPK LL PP t2 II C C Q∆V •  +•==− (14) When taking into consideration IOUT to be consumed during t1 and the Equivalent Series Resistance (RESR) of CL : L 1OUT ESR OUTPKOUTPK LL PP C tIR2 II1t2 II C C QV •−•  ++•  +•=Δ=− (15) When substituting equation (11) for equation (15) : ESR OUTPK L OFF PK OUTPK PP R2 II C t )II(V •  ++•−=− (16) Therefore to reduce the ripple voltage, it is important t hat the capacitor connected to the output pin has a large capacity and a small RESR.

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01  External Parts Selection 1. Inductor To minimize the loss due to inductor direct current resistance, select an inductor with the smallest possible direct current resistance (less than 1 Ω). Set the inductance value (L value) to around 22 μH to 1 mH. To make the average value of the output voltage (V OUT) constant, it is necessary to supply the energy corresponding to the output current (IOUT) from the inductor. The amount of charge required for I OUT is IOUT × (tON + tOFF). Because the inductor can supply energy only during t OFF, the charge is obtained by integrating equation (7) in the “ 3. Operation” in the “ Operation” with 0 → tOFF, namely, OFF PK t2 I • . Thus, )tt(It2 I OFFONOUTOFF PK +×=• (17) OUT OFF OFFON PK It tt2I •+•=∴ (18) When the oscillation duty ratio of OSC is 75%, IPK = 8 • IOUT. Therefore, an I PK current which is eight times IOUT flows into transistor (M1). The S-8351 Series includes a switching current controller wh ich monitors the current flowing into the CONT pin by the voltage (CONT control voltage) and controls the current. This controller prevents destruction of the IC due to excess current. If an inductor with a large L value is selected, both I PK and IOUT decrease. Since the energy stored in the inductor is equal to 2 PK )I( L2 1 • , the energy decreases because I PK decreases in steps of squares offsetting the increase of L value. As a result, stepping up at a low voltage becomes difficult and the minimum operating input voltage becomes high. However, the direct current resistance loss of L value and the M1 transistor decreases by the amount I PK decreased, and the inductance efficiency improves. On the other hand, if an inductor with a smaller L value is selected, both I PK and I OUT increase. Accordingly, the minimum operating input voltage becomes low but the inductance efficiency deteriorates. Caution An excessively large I PK may cause magnetic saturation for some core materials, leading to the destruction of the IC. Use a core with material that satisfies I sat *1 > IPK *1. Level of current that causes magnetic saturation. 2. Diode Use an external diode that meets the following requirements :

Low forward voltage : V F < 0.3 V
High switching speed : 500 ns max.
Reverse voltage : V OUT + VF or more
Current rate : I PK or more

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 4. 2 Bipolar (NPN) Type A circuit example using the CPH3210 (h FE = 200 to 560) from Sanyo Electric Co., Ltd. as a bipolar transistor (NPN) is shown in Figure 24 to 26 in the “ Standard Circuits ”. The h FE value and R b value of the bipolar transistor determine the driving capacity to increase the output current using a bipolar transistor. A peripheral circuit example of the transistor is shown in Figure 20. Nch Pch VOUT*1 IPK EXT Cb 2200 pF Rb 1 kΩ *1. VDD for D type. Figure 20 External Transistor Peripheral Circuit The recommended Rb value is around 1 k Ω. Actually, calculate the necessary base current (I b) from the bipolar transistor (hFE) using FE PK b h II = , and select the smaller Rb value than EXTHb OUT b I 4.0 I 7.0VR −−= *1. A small Rb value can increase the output current, but the efficiency decreases. Since a current may flow on the pulse and the voltage may drop due to wiring resistance or other factors in the actual circuit, therefore the optimum R b value should be determined by experiment. Connecting the speed-up capacitor (C b) in parallel with the R b resistance as shown in Figure 20 , decreases switching loss and improves the efficiency. The Cb value is calculated according to 7.0fRπ2 oscb b

••≤ . Select a C b value after performing sufficient evaluation since the optimum C b value differs depending upon the characteristics of the bipolar transistor. *1. For D type, EXTHb DD b I 4.0 I 7.0VR −−= .

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series 5. V DD / VOUT Separate Type (For S-8351/8352 Series D Type) The D type provides separate internal circuit power supply (VDD pin) and output voltage setting pin (VOUT pin) in the IC, making it ideal for the following applications. (1) Changing the output voltage value using an external resistor (2) Setting a high output voltage value, such as +15 V Cautions 1. This IC starts a step-up operation at VDD = 0.8 V, but set 1.8 ≤ VDD ≤ 10 V to stabilize the output voltage and frequency of the oscillator. (Input a voltage of 1.8 V or more at the VDD pin for all products with a setting less than 1.9 V.) An input voltage of 1.8 V or more at the VDD pin allows connection of the VDD pin to either the input voltage VIN pin or output VOUT pin. 2. Choose external resistors R A and RB so as to not affect the output voltage, considering that there is impedance between the VOUT pin and VSS pin in the IC chip. The internal resistance between the VOUT pin and VSS pin is as follows : (1) S-835xx18 : 2.1 MΩ to 14.8 MΩ (2) S-835xx20 : 1.4 MΩ to 14.8 MΩ (3) S-835xx30 : 1.4 MΩ to 14.2 MΩ (4) S-835xx50 : 1.4 MΩ to 12.1 MΩ 3. Attach a capacitor (C C) in parallel to the RA resistance when an unstable event such as oscillation of the output voltage occurs. Calculate C C using the following equation : kHz 20R2 A C

••= π F

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series (3) D type VREF Protection circuit L CONT SD VSS VIN CL CIN PFM control circuit IC internal power supply VDD Cc RB RA VOUT Figure 23 Caution The above connection diagram will not guarantee successful operation. Perform through evaluation using the actual application to set the constant.

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series (3) D type CL VREF SD VDD VSS PFM control circuit 2200 pF 1 kΩ CIN VIN EXT L Cc RB RA VOUT − + IC internal power supply Figure 26 Caution The above connection diag ram and constants will not guarantee successful operation. Perform through evaluation using the actual application to set the constant.

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01  Precautions

Mount the external capacitors, the diode, and the coil as close as possible to the IC.
Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover, rush current flows at the time of a power supply injection. Because they largely depend on the coil and the capacitor and impedance used, fully check them using an actually mounted model.
Make sure that the dissipation of the switching transisto r (especially at a high temperature) does not exceed the allowable power dissipation of the package.
The performance of this IC varies depending on the design of the PCB patterns, peripheral circuits and external parts. Thoroughly test all settings with your device. Also, try to use the recommended external parts. If not, contact an SII Semiconductor Corporation sales person.
When the impedance of the power supply is high, the shutdown pin is switched from “L” to “H”, or V IN is connected to the power supply, note that the power supply voltage drops temporarily because a rush current flows into the power supply.
Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic protection IC.
SII Semiconductor Corporation claims no responsibility for any and all disputes arising out of or in connection with any infringement of the products including this IC upon patents owned by third party.

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series  Characteristics (Typical Data) 1. Input voltage (V IN) vs. Powe Supply Input Current at No Load (IIN) Ta = 25°C 0 1 2 3 4 5 V IN [V] IIN [μA] S-8351A30MC S-8351A50MC 2. Output Voltage (V OUT) vs. Current Consumption 1 (ISS1) S-8351A S-8352A

80 ISS1 [μA]

VOUT [V] Ta = 25 °C 80ISS1 [μA] VOUT [V] 1234 5 6 7 Ta = 25 °C 3. Temperature (Ta) vs. Current Consumption 1 (I SS1)

50 ISS1 [μA]

−50 −25 0 25 50 75 100 Ta [°C] S-8351A30MC S-8351A50MC 50ISS1 [μA] −50 −25 0 25 50 75 100 Ta [°C] S-8352A30MC S-8352A50MC 4. Output Voltage (V OUT) vs. Current Consumption 2 (ISS2) 5. Temperature (Ta) vs. Current Consumption 2 (I SS2) Ta = 25°C ISS2 [μA] VOUT [V] 1 2 3 4 5 6 7 ISS1 [μA] −50 −25 0 25 50 75 100 Ta [°C] S-8351A30MC S-8351A50MC

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 6. Temperature (Ta) vs. Oscillation Frequency (f OSC) 100 110 120 130 140 −50 −25 0 25 50 75 100 Ta [°C] fOSC [kHz] S-8351A30MC S-8351A50MC 7. Temperature (Ta) vs. Duty Ratio 1 (Duty1) 8. Temperature (Ta) vs. Duty Ratio 2 (Duty2) Duty1 [%] −50 −25 0 25 50 75 100 Ta [°C] S-8351A30MC S-8351A50MC Duty2 [%] −50 −25 0 25 50 75 100 Ta [°C] S-8351A30MC S-8351A50MC 9. Output Voltage (V OUT) vs. Switching Current (ISW) 10. Temperature (Ta) vs. Switching Current (I SW) Ta = 25°C 0 1 2 3 4 5 6 7 VOUT [V] ISW [mA] 100 150 200 250 300 400ISW [mA] −50 −25 0 25 50 75 100 Ta [°C] 200 250 300 350 150

100 S-8351A30MC

Output Voltage (V OUT) vs. EXT Pin Output Current “H” (IEXTH) 12. Temperature (Ta) vs. EXT Pin Output Current “H” (I EXTH) Ta = 25°C

35 IEXTH [mA]

VOUT [V] 40IEXTH [mA] −50 −25 0 25 50 75 100 Ta [°C] S-8352A30MC S-8352A50MC

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series 13. Output Voltage (V OUT) vs. EXT Pin Output Current “L” (IEXTL) 14. Temperature (Ta) vs. EXT Pin Output Current “L” (I EXTL) Ta = 25°C

35 IEXTL [mA]

VOUT [V] 40IEXTL [mA] −50 −25 0 25 50 75 100 Ta [°C] S-8352A30MC S-8352A50MC 15. Temperature (Ta) vs. Operation Start Voltage (V ST1) 16. Temperature (Ta) vs. Retention Voltage (V HLD) 0.6 0.7 0.8 0.9

1.0 VST1 [V]

−50 −25 0 25 50 75 100 Ta [°C] S-8351A30MC S-8351A50MC 0.4 0.5 0.6 0.7 0.8VHLD [V] −50 −25 0 25 50 75 100 Ta [°C] 0.2 0.3 S-8351A30MC S-8351A50MC

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 17. Transient Response Characteristics The conditions for external parts are the same as those specified in the electrical characteristics. (1) Power-on (Ta = 25 °C, RL = 250 Ω) S-8351A30MC VIN = 0 → 1.8 V S-8351A50MC VIN = 0 → 3 V t [0.2 ms / div] Input voltage [0.5 V / div] Output voltage [0.5 V / div] 0 V 0 V 1.8 V 3 V t [0.2 ms / div] Input voltage [1 V / div] Output voltage [1 V / div] 0 V 0 V 3 V 5 V S-8352A30MC VIN = 0 → 1.8 V S-8352A50MC VIN = 0 → 3 V t [0.2 ms / div] Input voltage [0.5 V / div] Output voltage [0.5 V / div] 0 V 0 V 1.8 V 3 V t [0.2 ms / div] Input voltage [1 V / div] Output voltage [1 V / div] 0 V 0 V 3 V 5 V (2) Power Supply Voltage Fluctuation (Ta = 25 °C, RL = 250 Ω) S-8351A30MC VIN = 1.2 → 1.8 V S-8351A30MC VIN = 1.8 → 1.2 V t [0.1 ms / div] Input voltage [0.5 V /div] Output voltage [0.1 V / div ] 1.2 V 1.8 V 3 V t [0.1 ms / div] Input voltage [0.5 V / div] Output voltage [0.1 V / div] 1.8 V 1.2 V 3 V S-8351A50MC VIN = 2 → 3 V S-8351A50MC VIN = 3 → 2 V t [0.1 ms / div] Input voltage [0.5 V / div] Output voltage [0.1 V / div] 2 V 3 V 5 V t [0.1 ms / div] Input voltage [0.5 V / div] Output voltage [0.1 V / div] 3 V 2 V 5 V

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series S-8352A30MC VIN = 1.2 → 1.8 V S-8352A30MC VIN = 1.8 → 1.2 V t [0.1 ms / div] Output voltage [0.1 V / div] 1.2 V 1.8 V 3 V Input voltage [0.5 V /div] t [0.1 ms / div] Input voltage [0.5 V / div] Output voltage [0.1 V / div] 1.8 V 1.2 V 3 V S-8352A50MC VIN = 2 → 3 V S-8352A50MC VIN = 3 → 2 V t [0.1 ms / div] Output voltage [0.1 V / div ] 2 V 3 V 5 V Input voltage [0.5 V /div] t [0.1 ms / div] Input voltage [0.5 V / div] Output voltage [0.1 V / div] 3 V 2 V 5 V (3) Load Current Fluctuation (Ta = 25 °C) S-8351A30MC VIN = 1.8 V, IOUT = 10 μA → 12 mA S-8351A30MC VIN = 1.8 V, IOUT = 12 mA → 10 μA t [0.1 ms / div] Output current Output voltage [0.1 V / div] 3 V IOUT = 12 mA t [0.1 ms / div] Output current Output voltage [0.1 V / div] 3 V IOUT = 10 μA S-8351A50MC VIN = 3 V, IOUT = 10 μA → 20 mA S-8351A50MC VIN = 3 V, IOUT = 20 mA → 10 μA t [0.1 ms / div] 5 V Output current Output voltage [0.1 V / div] IOUT = 20 mA t [0.1 ms / div] 5 V Output current Output voltage [0.1 V / div] IOUT = 10 μA

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 S-8352A30MC VIN = 1.8 V, IOUT = 10 μA → 12 mA S-8352A30MC VIN = 1.8 V, IOUT = 12 mA → 10 μA t [0.1 ms / div] Output current Output voltage [0.1 V / div] 3 V IOUT = 12 mA t [0.1 ms / div] Output current Output voltage [0.1 V / div] 3 V IOUT = 10 μA S-8352A50MC VIN = 3 V, IOUT = 10 μA → 20 mA S-8352A50MC VIN = 3 V, IOUT = 20 mA → 10 μA t [0.1 ms / div] 5 V Output current Output voltage [0.1 V / div] IOUT = 20 mA t [0.1 ms / div] 5 V Output current Output voltage [0.1 V / div] IOUT = 10 μA (4) OFFON/ Pin Response (Ta = 25 °C, RL = 250 Ω) S-8351A30MC VIN = 1.8 V S-8351A50MC VIN = 3 V t [0.1 ms / div] Output voltage [0.3 V / div]

3 VOFF

t [0.1 ms / div] Output voltage [0.5 V / div]

5 VOFF

VIN = 1.8 V S-8352A50MC VIN = 3 V t [0.1 ms / div ] 3 V Output voltage [0.3 V / div] OFF ON OFF/ON voltage t [0.1 ms / div ] 5 V Output voltage [0.5 V / div] OFF ON OFF/ON voltage

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series  Reference Data Use this reference data to choose the external parts. This reference data makes it possible to choose the recommended external part based on the application and characteristics data. 1. External Parts for Reference Data Table 18 Condition Product Name Output Voltage V Power MOS FET Coil 1 S-8351A30MC 3.0 Built-in CDRH6D28-470 2 S-8351A30MC 3.0 Built-in CDRH6D28-101 3 S-8351A30MC 3.0 Built-in CXLP120-101 4 S-8351A50MC 5.0 Built-in CDRH6D28-101 5 S-8351A50MC 5.0 Built-in CDRH125-221 6 S-8351A50MC 5.0 Built-in CXLP120-470 7 S-8352A30MC 3.0 External CDRH6D28-220 8 S-8352A30MC 3.0 External CDRH6D28-101 9 S-8352A30MC 3.0 External CXLP120-470 10 S-8352A50MC 5.0 External CDRH6D28-220 11 S-8352A50MC 5.0 External CDRH6D28-101 12 S-8352A50MC 5.0 External CXLP120-101 The properties of the external parts are shown below. Table 19 Evaluation coil Part Product Name Manufacturer Characteristics Coil CDRH6D28-220 Sumida Corporation 22 μH, DCR *1 = 0.128 Ω, IMAX *2 = 1200 mA CDRH6D28-470 Sumida Corporation 47 μH, DCR *1 = 0.238 Ω, IMAX *2 = 800 mA CDRH6D28-101 Sumida Corporation 100 μH, DCR *1 = 0.535 Ω, IMAX *2 = 540 mA CDRH125-221 Sumida Corporation 220 μH, DCR *1 = 0.4 Ω, IMAX *2 = 800 mA CXLP120-470 Sumitomo Special Metals Co., Ltd 47 μH, DCR *1 = 0.95 Ω, IMAX *2 = 450 mA CXLP120-101 Sumitomo Special Metals Co., Ltd 100 μH, DCR *1 = 2.5 Ω, IMAX *2 = 200 mA *1. Direct current resistance *2. Maximum allowable current Table 20 Properties of External Parts Part Product Name Manufacturer Characteristics Diode MA2Z748 Matsushita Electronic Components Co., Ltd. VF*1 = 0.4V, IF*2 = 0.3A (Shottky type) Capacitor (Output capacitance) F93 Nichicon Corporation 16V, 47μF (Tantalum type) Transistor (NPN) CPH3210 Sanyo Electric Co.,Ltd. V CBO*3 = 40V, VCEO*4 = 30V hFE*5 = 200 min. (VCE = 2V, IC = 500mA) fT*6 = 290 MHz typ. (VCE = 10V, IC = 500mA) current gain, *6. Gain-bandwidth product Caution The above values shown in the characteristics column of Table 19 and 20 are based on the materials provided by each manufacture. However, consider the characteristics of the original materials when using the above products.

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 2. Step-up Characteristics (Ta = 25 °C) The data of the step-up characteristics ((a) Input voltage (V IN) vs. Output voltage (VOUT) characteristics (Input voltage stepped up), (b) Input voltage (VIN) vs. Output voltage (VOUT) characteristics (Input voltage stepped down), (c) Output current (I OUT) vs. Output voltage (V OUT) characteristics, (d) Output current (I OUT) vs. Efficiency ( η) characteristics under conditions of 1 to 12 in Table 18 is shown below. Condition 1 S-8351A30MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 2.8 2.9 3.0 3.1 3.2 2.6

2.7 VOUT [V]

VIN [V] 2 3 41 0 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 20 mA I OUT = 50 mA I OUT = 100 mA 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 410 3.2 2.6 2.7 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 20 mA I OUT = 50 mA I OUT = 100 mA (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (I OUT) vs. Efficiency (η) 2.8 2.9 3.0 3.1 IOUT [mA] VOUT [V] 100 150 200 50 0 3.2 2.6 2.7 250 V IN = 1.0 V, V IN = 2.0 V V IN = 1.5 V, V IN = 2.5 V V IN = 1.8 V 70η [%] IOUT [mA] 1 10 100 10000.10.01 VIN = 1.0 V V IN = 1.5 V V IN = 1.8 V V IN = 2.0 V V IN = 2.5 V Condition 2 S-8351A30MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 41 0 3.2 2.6 2.7 I OUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 20 mA I OUT = 50 mA I OUT = 100 mA 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 410 3.2 2.6 2.7 I OUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 20 mA I OUT = 50 mA I OUT = 100 mA (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) 3.0 2.8 2.9 3.1 IOUT [mA] VOUT [V] 100 150 200 50 0 3.2 2.6 2.7 250 V IN = 1.0 V, V IN = 2.0 V V IN = 1.5 V, V IN = 2.5 V V IN = 1.8 V 80η [%] IOUT [mA] 1 10 100 10000.10.01 VIN = 1.0 V V IN = 1.5 V V IN = 1.8 V V IN = 2.0 V V IN = 2.5 V

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series Condition 3 S-8351A30MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 41 0 3.2 2.6 2.7 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 20 mA I OUT = 50 mA 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 410 3.2 2.6 2.7 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 20 mA I OUT = 50 mA (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) 3.0 2.8 2.9 3.1 IOUT [mA] VOUT [V] 100 150 200 50 0 3.2 2.6 2.7 250 VIN = 1.0 V V IN = 1.5 V V IN = 1.8 V V IN = 2.0 V V IN = 2.5 V 70η [%] IOUT [mA] 1 10 100 10000.10.01 VIN = 1.0 V V IN = 1.5 V V IN = 1.8 V V IN = 2.0 V V IN = 2.5 V Condition 4 S-8351A50MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 4.8 4.9 5.0 5.1 VIN [V] VOUT [V] 2 3 5 1 0 5.2 4.6 4.7 4 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA 4.8 4.9 5.0 5.1 VIN [V] VOUT [V] 5.2 4.6 4.7 23 5 104 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) 5.1 5.0 4.8 4.9 IOUT [mA] VOUT [V] 100 150 200 50 0 5.2 4.6 4.7 250 VIN = 1.5 V V IN = 2.0 V V IN = 3.0 V 90η [%] IOUT [mA] 1 10 100 10000.10.01 100 VIN = 1.0 V V IN = 1.5 V V IN = 2.0 V V IN = 3.0 V V IN = 4.0 V

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 Condition 5 S-8351A50MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 4.8 4.9 5.0 5.1 VIN [V] VOUT [V] 2 3 5 1 0 5.2 4.6 4.7 4 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA 4.8 4.9 5.0 5.1 VIN [V] VOUT [V] 4.6 4.7 23 5 104 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA 5.2 (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) 4.8 4.9 5.0 5.1 IOUT [mA] VOUT [V] 100 150 200 50 0 5.2 4.6 4.7 250 VIN = 1.5 V V IN = 2.0 V V IN = 3.0 V 90η [%] IOUT [mA] 1 10 100 10000.10.01 100 VIN = 1.0 V V IN = 1.5 V V IN = 2.0 V V IN = 3.0 V VIN = 4.0 V Condition 6 S-8351A50MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 4.8 4.9 5.0 5.1 VIN [V] VOUT [V] 2 3 5 1 0 4.6 4.7 4 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA 5.2 4.8 4.9 5.0 5.1 VIN [V] VOUT [V] 4.6 4.7 23 5 104 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA 5.2 (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) 4.8 4.9 5.0 5.1 IOUT [mA] VOUT [V] 5.2 4.6 4.7 100 150 200 50 0 250 VIN = 1.5 V V IN = 2.0 V V IN = 3.0 V 80η [%] IOUT [mA] 1 10 100 10000.10.01 VIN = 1.0 V V IN = 1.5 V V IN = 2.0 V V IN = 3.0 V V IN = 4.0 V

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series Condition 7 S-8352A30MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 41 0 3.2 2.6 2.7 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 410 3.2 2.6 2.7 IOUT = 0.1 mA I OUT = 1 mA I OUT = 0 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) 2.8 2.9 3.0 3.1 IOUT [mA] VOUT [V] 100 150 200 50 0 3.2 2.6 2.7 250 300 350 V IN = 1.5 V V IN = 1.8 V V IN = 2.0 V V IN = 2.5 V 80η [%] IOUT [mA] 1 10 100 10000.10.01 VIN = 1.5 V V IN = 1.8 V V IN = 2.0 V V IN = 2.5 V Condition 8 S-8352A30MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 41 0 3.2 2.6 2.7 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 410 3.2 2.6 2.7 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) 2.8 2.9 3.0 3.1 IOUT [mA] VOUT [V] 3.2 2.6 2.7 100 150 200 50 0 250 300 350 VIN = 1.5 V V IN = 1.8 V V IN = 2.0 V V IN = 2.5 V 80η [%] IOUT [mA] 1 10 100 10000.10.01 VIN = 1.5 V V IN = 1.8 V V IN = 2.0 V V IN = 2.5 V

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series Rev.3.0_01 Condition 9 S-8352A30MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 41 0 2.6 2.7 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA 3.2 2.8 2.9 3.0 3.1 VIN [V] VOUT [V] 2 3 410 3.2 2.6 2.7 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) IOUT [mA] VOUT [V] 100 150 200 50 2.8 2.9 3.0 3.1 3.2 2.6 2.7 0 250 300 350 VIN = 1.5 V V IN = 1.8 V V IN = 2.0 V V IN = 2.5 V 80η [%] IOUT [mA] 1 10 100 10000.10.01 VIN = 1.5 V V IN = 1.8 V V IN = 2.0 V V IN = 2.5 V Condition 10 S-8352A50MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 4.8 4.9 5.0 5.1 VIN [V] VOUT [V] 2 3 5 1 0 5.2 4.6 4.7 4 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA 4.8 4.9 5.0 5.1 VIN [V] VOUT [V] 5.2 4.6 4.7 23 5 104 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) 4.8 4.9 5.0 5.1 IOUT [mA] VOUT [V] 100 200 300 50 0 5.2 4.6 4.7 400150 250 350 450 VIN = 1.5 V V IN = 2.0 V V IN = 3.0 V V IN = 4.0 V 50 80η [%] IOUT [mA] 1 10 100 10000.10.01 VIN = 2.0 V V IN = 3.0 V V IN = 4.0 V

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER Rev.3.0_01 S-8351/8352 Series Condition 11 S-8352A50MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 4.8 4.9 5.0 5.1 VIN [V] VOUT [V] 2 3 5 1 0 4.6 4.7 4 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA 5.2 VIN [V] VOUT [V] 23 5 1 4.8 4.9 5.0 5.1 5.2 4.6 4.7 0 4 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA I OUT = 150 mA (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) 4.8 4.9 5.0 5.1 IOUT [mA] VOUT [V] 4.6 4.7 100 200 300 50 0 400 150 250 350 450 VIN = 1.5 V V IN = 2.0 V V IN = 3.0 V V IN = 4.0 V 5.2 80η [%] IOUT [mA] 1 10 100 10000.10.01 VIN = 2.0 V V IN = 3.0 V V IN = 4.0 V Condition 12 S-8352A50MC (a) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage raising) (b) Input voltage (VIN) vs. Output voltage (VOUT) (Input voltage falling) 4.8 4.9 5.0 5.1 VIN [V] VOUT [V] 2 3 5 1 0 5.2 4.6 4.7 4 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA 4.8 4.9 5.0 5.2 VIN [V] VOUT [V] 4.6 4.7 23 5 104 6 IOUT = 0.1 mA I OUT = 1 mA I OUT = 10 mA I OUT = 50 mA I OUT = 100 mA 5.1 (c) Output current (IOUT) vs.Output voltage (VOUT) (d) Output current (IOUT) vs. Efficiency (η) 4.8 4.9 5.0 5.1 IOUT [mA] VOUT [V] 5.2 4.6 4.7 100 200 300 50 0 400 150 250 350 450 VIN=2.0 V V IN=3.0 V V IN=4.0 V 80η [%] IOUT [mA] 1 10 100 10000.10.01 VIN = 3.0 V V IN = 4.0 V

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Product Information

S8351 specifications and overview.

Summary

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER

Description

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER

Source title S8351 Datasheet(PDF) - Seiko Instruments Inc

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