SC632

SC632_1 SEMTECH | Alldatasheet

Document overview

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Technical content

Features

Input voltage range — 2.9V to 5.5V VOUT tolerance — 5.0V ±3% Continuous output current — 275mA Peak output current — 500mA Three charge pump modes — 1x, 1.5x and 2x Output ripple ≤ 30mV PP for IOUT ≤ 400mA Short circuit, over-voltage, and over-temperature protection Soft-start functionality Shutdown current — 0.1μA, typical Ultra thin package — 2 x 2 x 0.6 (mm) Lead free and Halogen free WEEE and RoHS compliant

Applications

Compact fl ash/CF+ products PMPs Digital video cameras Digital still cameras PDAs

Description

The SC632 is a high-current voltage regulator using Semtech’s proprietary low-noise charge pump technol- ogy. Performance is optimized for use in single Li-Ion battery cell applications. The regulator provides the per- formance of a linear, low drop-out (LDO) voltage regulator when the input is greater than 5.0V. Unlike an LDO, drop- out is avoided when the input is less than 5.0V. Instead, a charge pump is activated to provide voltage boost and the head-room needed for voltage regulation. Only two 2.2 μF bucket capacitors are required to deliver the full output current. The charge pump provides a low EMI solution compared to inductive boost regulators. The SC632’s charge pump has three modes of operation: 2x, 1.5x, and 1x modes. The 2x and 1.5x modes deliver current to the load in each of two phases. The 1x mode turns off the charge pump, delivering current through an LDO. When active, the charge pump provides low-ripple operation at 200kHz, which is typically less than 30mVpp at the output. The SC632 is capable of delivering 275mA continuous current, with peak current to 500mA. A 22 μF output capacitor is used for decoupling the load and for smoothing mode transitions. Hysteresis is provided to prevent chatter between charge pump modes. SC632 VBAT VOUT = 5.0V @ 275mA OUT C1+ IN GND EN C1- C2+ C2- CIN 22μF COUT 22μF 2.2μF 2.2μF Chip enable Typical Application Circuit October 7, 2009 Patents Pending

Ordering Information

SC632ULTRT(1)(2) MLPD-UT-8 2x2 SC632EVB Evaluation Board Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free packaging only. Device is WEEE and RoHS compliant, and halogen free. TOP VIEW T 4 5 C2+ C2- OUT EN GND C1+ C1- IN 632 yw MLPD-UT-8; 2x2, 8 LEAD θJA = 68°C/W yw = Datecode

Exceeding the above specifi cations may result in permanent damage to the device or device malfunction. Operation outside of the parameters specifi ed in the Electrical Characteristics section is not recommended. NOTES (1) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. (2) Tested according to JEDEC standard JESD22-A114-B. Absolute Maximum Ratings OUT + 0.3) Recommended Operating Conditions Thermal Information Thermal Resistance, Junction to Ambient(1) (°C/W) . . . . 68 Parameter Symbol Condition Min Typ Max Units Output Voltage V OUT VIN = 4.2V, IOUT = 1mA 4.85 5.0 5.15 V Output Voltage Ripple V PP IOUT ≤ 400mA 30 mV Maximum Output Current I OUT Peak Load - thermally limited(1), TJ <150°C, 3.3V ≤ VIN ≤ 5.5V 500 mA Continuous Load, TA ≤ 55°C, 3.15V ≤ VIN ≤ 4.2V 400 mA Continuous Load, 3.10V ≤ VIN ≤ 4.2V 275 mA Shutdown Current I SD Shutdown (EN = GND), VIN = 3.6V 0.1 2 μA Total Quiescent Current I Q EN high, IOUT = 1mA 1.5 2.5 mA Charge Pump Frequency f PUMP VIN = 3.2V 140 200 260 kHz Start-Up Time t SU (EN transitions from low to high), 4.85V ≤ VOUT ≤ 5.15V, No load 400 μs Line Regulation ΔV LINE IOUT = 1mA, 2.85V ≤ VIN ≤ 4.2V 21 mV Load Regulation ΔV LOAD VIN =4.2V, 1mA ≤ IOUT ≤ 400mA 37.5 mV

Electrical Characteristics

Parameter Symbol Condition Min Typ Max Units EN Input High Threshold V IH VIN = 5.5V 1.6 V EN Input Low Threshold V IL VIN = 2.7V 0.4 V EN Input High Current I IH VIN = 5.5V 2 μA EN Input Low Current I IL VIN = 5.5V 2 μA Open-Loop Output Resistance R OUT 1x mode 0.25 Ω 1.5x mode, VIN = 3.7V 2.85 Ω 2x mode, VIN = 3.1V 2.9 Ω Mode Transition Voltage (2) VTRANS 1X IOUT = 200mA 5.05 V VTRANS 1.5X IOUT = 200mA 3.71 V Fault Protection Short-Circuit Current I SC VOUT = 0V, IOUT = IIN 300 600 980 mA Input Current Limit I LIMIT VOUT > 2V, 1x mode 0.6 1.2 2.0 A VOUT > 2V, 1.5x and 2x modes 1.2 2.0 2.8 A VOUT ≤ 2V, IOUT = IIN 700 mA Over Temperature TOTP Rising Threshold 165 °C THYS Hysteresis(3) 20 °C Electrical Characteristics (continued) Notes: (1) Thermal limitation is dependent upon the thermal performance of the printed circuit board in support of the package standar d of 68° C/W. (2) Voltage at the IN pin where a mode transition takes place in the charge pump with V IN falling. (3) Guaranteed by design — not tested in production.

Output Current (mA) VOUT = 5V, VIN = 4.2V TA=85°C TA=25°C TA=-40°C Output Voltage Variation — ΔVLOAD (mV) -15 -10 Output Voltage Variation — ΔVLINE (mV) VOUT = 5V, IOUT = 1mA Input Voltage (V) 3.6V, 0mV 85°C 25°C -40°C Line Regulation PSRR versus Frequency — 1.5x Mode -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 10 100 1000 1000 0 Frequency (Hz) Gain (dB) VIN = 4.2V, VOUT = 5V, IOUT = 50mA PSRR versus Frequency — 1.5x Mode -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 10 100 1000 1000 0 Frequency (Hz) Gain (dB) VIN = 3.6V, VOUT = 5V, IOUT = 50mA CIN=COUT=22μF (0805) C1=C2=2.2μF (0603) PSRR versus Frequency — 2x Mode -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 10 100 1000 10000 Frequency (Hz) Gain (dB) VIN = 2.9V, VOUT = 5V, IOUT = 50mA CIN=COUT=22μF (0805) C1=C2=2.2μF (0603) CIN=COUT=22μF (0805) C1=C2=2.2μF (0603)

Typical Characteristics (continued) Effi ciency — 10mA Effi ciency — 50mA Effi ciency — 200mA Effi ciency — 100mA Effi ciency — 400mA Effi ciency — 300mA 100 Input Voltage (V) Efficiency(%) VOUT = 5V, IOUT = 10mA 1.5x Mode Mode Transition Hysteresis 2x Mode 100 VOUT = 5V, IOUT = 50mA 1.5x Mode 2x Mode Mode Transition Hysteresis Input Voltage (V) Efficiency(%) 100 V OUT = 5V, IOUT = 200mA 1.5x Mode 2x Mode Mode Transition Hysteresis Efficiency(%) Input Voltage (V) 100 VOUT = 5V, IOUT = 100mA Efficiency(%) Input Voltage (V) Mode Transition Hysteresis 1.5x Mode 2x Mode 100 Input Voltage (V) 2x Mode 1.5x Mode VOUT = 5V, IOUT = 300mA Efficiency(%) 100 Input Voltage (V) Efficiency(%) VOUT = 5V, IOUT = 400mA 1.5x Mode 2x Mode

Ripple — 1x Mode Time (10μs/div) VIN -PP (20mV/div) VOUT -PP (20mV/div) IOUT (200mA/div) VIN = 5.2V, VOUT = 5.0V, IOUT = 400mA CIN=COUT=22μF (0805) C1=C2=2.2μF (0603) Ripple — 1.5x Mode Ripple — 2x Mode VIN -PP (100mV/div) VOUT -PP (100mV/div) IOUT (200mA/div) VIN -PP (50mV/div) VOUT -PP (50mV/div) IOUT (200mA/div) Time (10μs/div) Time (10μs/div) CIN=COUT=22μF (0805) C1=C2=2.2μF (0603) CIN=COUT=22μF (0805) C1=C2=2.2μF (0603) 0mA 400mA VIN = 4.2V, VOUT= 5.0V, IOUT = 400mA VIN = 3.2V, VOUT = 5.0V, IOUT = 400mA 0mA 400mA 0mA 400mA Startup (No Load) VIN = 3.6V, IOUT = 0mA VEN (2V/div)– 0V— VOUT (2V/div)– 0V— 0V— IOUT (200mA/div) Startup (400mA) VIN = 3.6V, IOUT = 400mA VEN (2V/div)– 0V — VOUT (2V/div)– 0V— 0V— IOUT (200mA/div)– Typical Characteristics (continued) Time (200μs/div) Time (200μs/div) Quiescent Current 0.5 1.0 1.5 2.0 2.5 -45C 25C85C CIN=COUT=22μF (0805) C1=C2=2.2μF (0603) CIN=COUT=22μF (0805) C1=C2=2.2μF (0603) VOUT = 5V, IOUT = 1mA VIN (V) IQ (mA)

1 GND Ground — connect to ground plane with multiple vias

2 C1+ Positive terminal of bucket capacitor 1

3 C1- Negative terminal of bucket capacitor 1

4 IN Input supply voltage

— active-high

6 OUT Output

7 C2+ Positive terminal of bucket capacitor 2

8 C2- Negative terminal of bucket capacitor 2

T Thermal Pad This pad is for heat sinking and is not connected internally. It must be connected to a ground plane using multiple vias.

The SC632 is a 5.0V output charge pump regulator designed to support up to 400mA (TA ≤ 55°C, 3.15V ≤ VIN ≤ 4.2V) and 275mA (TA ≤ 85°C, 3.15V ≤ VIN ≤ 5.5V) of continu- ous current for powering 5.0V devices in portable handheld equipment including Compact Flash and CF+ products. The SC632 has three operating modes — 1x, 1.5x, and 2x. The 1x mode is a linear series regulation mode with a low open-loop output resistance of only 250m Ω. The 1x mode functions as a low-noise series linear regulator. The 1.5x and 2x modes are a low noise, constant frequency, con- stant duty cycle switch mode, using two bucket capacitors. One bucket supports the full output current while the other bucket charges from the input. The two buckets exchange roles in the next phase, supplying continuous output current in both phases and reducing the need for a large output decoupling capacitor. The constant fre- quency, constant duty cycle operation also produces predictable constant frequency harmonics. Mode Transition Hysteresis Hysteresis is provided to prevent chatter between charge pump modes for input steps of up to 120mV. Decouple the input to prevent steps greater than 120mV, for optimum transient performance, when the input voltage reaches the mode transition thresholds. Thermal Resistance The SC632 package is thermally effi cient when the circuit board layout connects the thermal pad through multiple vias to the ground plane. The thermal resistance rating is dependent upon the connection between the thermal pad and the ground plane. A layout that is done correctly should keep the junction temperature below the over- temperature limit while operating the SC632 within the specifi ed electrical conditions. A poor layout may allow the junction temperature to reach the over temperature limit, so it is important to maintain adequate ground plane around the device to maximize heat transfer to the PCB. Temperature Derating The VIN supply range and ambient temperature range of the application should be compared with the following derating curve to determine the maximum safe continu- ous load current. The DC operating points beneath each curve are in the safe operating temperature range of the MLP package. 150 200 250 300 350 400 450 35 45 55 65 75 85 95 105 Ambient Temp (°C) IOUT (mA) Derating for VIN < 4.2V Derating for VIN < 5.5V Maximum Continuous Output Protection Circuitry The SC632 also provides protection circuitry that pre- vents the device from operating in an unspecifi ed state. These functions include: Over-Current Protection (OCP) Short-Circuit Current Protection (SCCP) Over-Temperature Protection (OTP) Over-Current Protection Over-current protection is provided to limit the output current. When V OUT is greater than 2V, OCP limits the output to 1A typical. The threshold at 2V allows the device to recover from excessive voltage droop during an over current. Applications Information

Short-Circuit Current Protection Short-circuit current protection is provided to limit the current that can be sourced when the output is shorted to ground. When a short circuit forces V OUT to drop below 2V, the SCCP detects the condition and limits the output current to 600mA (typical). Over-Temperature Protection The over-temperature circuit helps prevent the device from overheating and experiencing a catastrophic failure. When the junction temperature exceeds 165°C, the device is disabled. It remains disabled until the junction tempera- ture drops below this threshold. Hysteresis is included that prevents the device from re-enabling until the junc- tion temperature is reduced by 20°C. Capacitor Selection The SC632 is designed to use low-ESR ceramic capacitors for the input and output bypass capacitors as well as the charge pump bucket capacitors. Ideal performance is achieved when the bucket capacitors are exactly equal. The value of input and output decoupling capacitors will vary with system requirements. For best ripple perfor- mance C IN and C OUT are normally 22μF and the bucket capacitors C1 and C2 are 2.2μF. For low profi le designs, two 10μF capacitors may be used in place of each 22μF. Applications Information (continued) When selecting capacitors for an application, fi rst consider the DC voltage characteristic of the capacitor. The value of capacitance at the DC operating voltage may be con- siderably lower than the rated value. The following table lists recommended capacitor values which have been chosen to minimize the impact of this limitation. Table 1 — Recommended Capacitors Capacitor Value μF Case Size Notes CIN , COUT 22 0805 Typical output VPP ≤ 20mV in all charge pump modes Typical input ripple ≤ 100mV in all charge pump modes CBUCKET 2.2 0603 Required for the full rated output current CBUCKET 2.2 0402 Useful for load current up to 300mA NOTE: Use only X5R type capacitors, with a 6.3V rating or higher The highest capacitance values in the smallest package sizes will tend to have poor DC voltage characteristics. The highest value 0402 size capacitor retains as little as 35% of its rated value at 5VDC. The same value chosen in the next larger package size, 0603, will retain about 60% of its rated value at 5VDC.

Applications Information (continued) PCB Layout Considerations Poor layout can degrade the performance of the regula- tor and can be a contributory factor in EMI problems, ground bounce, thermal issues, and resistive voltage losses. Poor regulation and instability can result. The following design rules are recommended: Place the bucket capacitors as close to the device as possible and on the same side of the board. Use short wide copper areas between the capacitor pins and the device pins. Place the input and output decoupling capacitors as close as possible to the device and connect these capacitors’ ground pads together to the ground plane using multiple vias through a short wide copper area. Connect pin 1 directly to the copper area under the thermal pad. The thermal pad at the center of the device is not electrically connected. Connect this pad to the ground plane using multiple vias. Use a ground plane to further reduce noise interference on sensitive circuit nodes. COUT EN IN CIN SC632 OUT C2+ C2- C1+ C1- GND C2GND EN

Outline Drawing — MLPD-UT-8 2x2 2.00.079 PIN 1 INDICATOR (LASER MARK) SEATING PLANE C B A aaa C N E 2.10 2.10 1.90 1.90 .083 .083 .075 .075 D e/2 e bxN bbb C A B COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.2. D/2 E/2 E LxN INCHES .020 BSC b .007 bbb aaa N L e D .012 DIM A MIN .000 .020 0.400.30 .004 .003 .014 .079 .016 0.08 0.10 0.35 2.00

0.50 BSC

0.05 0.60 DIMENSIONS MIN 0.00 NOM (.006) MAX .002 .024 NOM 0.50 (0.1524) CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). NOTES: A

Power Management Products Division

200 Flynn Road, Camarillo, CA 93012

Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com Contact Information SC632 Land Pattern — MLPD-UT-8 2x2 INCHES DIMENSIONS P Z X Y C G DIM MILLIMETERS FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF THE DEVICE. SHALL BE CONNECTED TO A SYSTEM GROUND PLANE. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD3. H .067 1.70 K .031 0.80 R .006 0.15 Y R G Z P X (C) 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). H K .030 .106 (.077) .047 0.75 2.70 (1.95) 1.20 0.30 0.50.020 .012 THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. NOTES: