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LT3464_1 LINER

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Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
PDF pages: 16

Technical content

25µA in Active Mode
0.5µA in Shutdown Mode n Internal 115mA, 36V Switch n Integrated Schottky Diode n Integrated PNP Output Disconnect with Short-Circuit Protection n Internal Reference Override Pin n 16V at 8mA from 3.6V Input n 12V at 20mA from 5V Input n Input Range: 2.3V to 10V n High Output Voltage: Up to 34V n Low Profile (1mm) SOT-23 Package Micropower Boost Converter with Schottky and Output Disconnect in ThinSOT™ The LT 3464 is a micropower step-up DC/DC converter with integrated Schottky diode and output disconnect packaged in an 8-lead low profile (1mm) SOT-23. The small package size, high level of integration, and the use of tiny SMT components yield a solution size of less than 40mm 2. The LT3464 has a typical current limit of 115mA as well as fast switching speed to allow the use of a chip inductor and small ceramic capacitors. The internal PNP disconnects the output load from the input during shut- down, and also provides output short-circuit protection. An auxiliary reference input allows the user to override the internal 1.25V feedback reference with any lower value, allowing full control of the output voltage during opera- tion. This device features a low 25 µA quiescent current, which is further reduced to less than 0.5µA in shutdown. A current limited fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad range of operating current. The rugged 36V switch and output disconnect circuitry allow outputs up to 34V to be easily generated in a simple boost topology. , LTC and LT are registered trademarks of Linear Technology Corporation. n OEL Panel Bias n LCD Bias n Handheld Computers n Battery Backup n Digital Cameras n Cellular Phones CTRL SHDN VIN VIN 2.3V TO 10V VOUT 16V SW GND OUT CAP FB LT3464 22µH 1µF 0.22µF 0.33µF 3.48M 294k

3464 TA01a

ThinSOT is a trademark of Linear Technolgy Corporation Efficiency LOAD CURRENT (mA) EFFICIENCY (%) 0.01 1 10 100

3634 TA01b

0.1 VIN = 8.4V VIN = 4.2V

Operating Temperature Range (Note 2) .. – 40°C to 85°C ORDER PART NUMBER TJMAX = 125°C, θJA = 140°C/W, θJC = 85°C/W LT3464ETS8 ABSOLUTE AXI U RATI GSW WW U PACKAGE/ORDER I FOR ATIOUU W (Note 1) ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage 2.0 2.3 V Quiescent Current Not Switching 25 36 µA VSHDN = 0.2V 0.01 0.5 µA FB Comparator Trip Voltage V FB Falling, VCTRL = 3.6V l 1.215 1.250 1.275 V FB Comparator Hysteresis 10 mV FB Pin Bias Current V FB = 1.25V, VCTRL = 3.6V l 33 0 n A FB Voltage Line Regulation 2.3V < V IN < 10V 0.05 0.1 %/V Switch Off Time V CAP-VIN = 5V 250 ns VCAP-VIN = 0V 1.0 µs Switch Leakage Current V SW = 36V 0.02 1 µA Switch VCESAT ISW = 80mA 190 300 mV Switch Current Limit 85 115 140 mA Schottky Forward Voltage I SCHOTTKY = 110mA 600 750 mV Schottky Reverse Leakage V CAP-SW = 36V 1 10 µA PNP Disconnect VCAP-OUT IOUT = 200µA 100 mV IOUT = 10mA 190 mV PNP Disconnect Q Current I OUT = 0, VCAP = 36V (Note 3) 1.5 5 µA PNP Disconnect Leakage SHDN = 0.2, V CAP = 10V, VOUT = 0V 0.1 5 µA PNP Disconnect Current Limit V CAP = 10V, VOUT = 0V 25 45 75 mA SHDN Pin Current V SHDN = 3.6V 5 10 µA SHDN Input Voltage High 2.3 V SHDN Input Voltage Low 0.2 V CTRL Pin Bias Current V CTRL = 0.5V, VFB = 1V l 68 0 n A CTRL to FB Offset V CTRL = 0.5V (Note 4) 2 7 mV Consult LTC Marketing for parts specified with wider operating temperature ranges. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT3464E is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40 °C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Current consumed by Disconnect PNP when there is no load on the OUT pin. Note 4: This figure is computed according to ((VFB falling + VFB rising)/2) –VCONTROL. CTRL 1 FB 2 OUT 3 GND 4

8 SHDN

7 VIN

5 CAP

TYPICAL PERFOR A CE CHARACTERISTICSUW Switch Saturation Voltage ISW = 80mA Switch Current Limit Switch Off-Time, VCAP – VIN = 5V Minimum Switch On-Time Switch Off-Time, VCAP – VIN = 0V Output Disconnect Voltage Drop Output Disconnect Quiescent Current Output Disconnect Current Limit Output Disconnect Voltage Drop SWITCH VOLTAGE (mV) 220 200 180 160 140 120 100

3464 G01

CURRENT LIMIT (mA) COLLECTOR CURRENT (mA) VOLTAGE DROP (mV) 300 250 200 150 100 10 20

3464 G09

VOLTAGE DROP (mV) 300 250 200 150 100

3464 G06

TEMPERATURE (°C) SWITCH CURRENT (mA) 140 120 100

3464 G02

–50 –25 0 25 50 75 100 TEMPERATURE (°C) –50 –25 0 25 50 75 100 TEMPERATURE (°C) –50 –25 0 25 50 75 100 TEMPERATURE (°C) –50 –25 0 25 50 75 100 TEMPERATURE (°C) –50 –25 0 25 50 75 100 TEMPERATURE (°C) –50 –25 0 25 50 75 100 SWITCH OFF-TIME (ns)

3464 G03

SWITCH OFF-TIME (µs)

3464 G05

1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 SWITCH ON-TIME (ns)

3464 G04

TEMPERATURE (°C) –50 –25 0 25 50 75 100

3464 G07

TEMPERATURE (°C) –50 –25 0 25 50 75 100

3464 G08

QUIESCENT CURRENT (µA) 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 IOUT = 200µA IOUT = 10mA

SHUTDOWN PIN CURRENT (µA)

3464 G13

TEMPERATURE (°C) –50 –25 0 25 50 75 100 FB PIN VOLTAGE (V) 1.30 1.28 1.26 1.24 1.22 1.20

3464 G16

TEMPERATURE (°C) –50 –25 0 25 50 75 100 LEAKAGE CURRENT (µA) TEMPERATURE (°C) –50 –25 0 25 50 75 100 SCHOTTKY CURRENT (mA) 250 200 150 100

3464 G11

FORWARD VOLTAGE (mV) 200 300 400 500 600 700 800 TEMPERATURE (°C) –50 –25 0 25 50 75 100 VOLTAGE DROP (mV)

3464 G10

TEMPERATURE (°C) –50 –25 0 25 50 75 100 QUIESCENT CURRENT (µA)

3464 G12

TEMPERATURE (°C) –50 –25 0 25 50 75 100 SHDN PIN VOLTAGE (V)

3464 G15

3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0

3464 G20

TEMPERATURE (°C) –50 –25 0 25 50 75 100 QUIESCENT CURRENT (nA)

3464 G14

VOUT (V) 12 16

3464 G18

QUIESCENT CURRENT (µA) VIN = 5V FRONT PAGE SCHEMATIC VCAP – SW = 36V Schottky Forward Drop at ID = 110mA Schottky Forward Voltage Quiescent Current TYPICAL PERFOR A CE CHARACTERISTICS UW Shutdown Pin Current VSHDN = 3.6V Quiescent Current in Shutdown Mode SHDN Pin Threshold Voltage FB Pin Voltage Quiescent Current in Regulation with No Load Schottky Reverse Leakage

CTRL (Pin 1): Internal Reference Override Pin. This allows the FB voltage to be externally set between 0V and 1.25V. Tie this pin to above 1.5V (V IN for example) to use the internal 1.25V reference. VV R R OUT CTRL=+  when VCTRL is less than 1.25V (see Figure 4) FB (Pin 2): Feedback Pin. The LT3464 regulates its feed- back pin to 1.25V if the internal reference is used or to VCTRL if the CTRL pin is between 0V and 1.25V. Connect the feedback resistor divider tap to this pin. Set the output voltage by selecting R1 and R2 (see Figure 4). RR V V OUT REF 21 1=  ± OUT (Pin 3): PNP Collector. This is the output of the Output Disconnect circuit. Bypass this pin with at least a 0.1µF capacitor connected to the CAP pin or to ground. GND (Pin 4): Ground. Tie this pin directly to the ground plane. CAP (Pin 5): PNP Emitter and Schottky Cathode. This pin connects to the output capacitor, and optionally to the external phase-lead capacitor. SW (Pin 6): Switch Pin and Schottky Anode. This is the collector of the internal NPN power switch. Minimize the metal trace area connected to the pin to minimize EMI. VIN (Pin 7): Input Supply Pin: Bypass this pin with a capacitor located as close to the device as possible. SHDN (Pin 8): Shutdown Pin. This pin is used to put the device in shutdown mode. Tie the pin low to shut down the LT3464. Tie high for normal operation See the electrical specifications for the required voltages. UUUPI FU CTIO S FB Pin Voltage vs CTRL Pin Voltage FB and CTRL Pin Bias Currents TYPICAL PERFOR A CE CHARACTERISTICS UW HYSTERESIS (mV)

3464 G19

TEMPERATURE (°C) –50 –25 0 25 50 75 100 TEMPERATURE (°C) –50 –25 0 25 50 75 100 BIAS CURRENT (nA) FB PIN VOLTAGE (V) 1.50 1.25 1.00 0.75 0.50 0.25

3464 G17

CONTROL PIN VOLTAGE (V) FB Pin Hysteresis

The LT3464 uses a constant off-time control scheme in conjunction with Burst Mode operation to provide high efficiency over a wide range of output current. Operation can best be understood by studying the Block Diagram. When the FB pin voltage is lower than the 1.25V reference, the hysteretic comparator enables the power section, causing the chip to start switching, thus charging the output capacitor. When the output voltage increases enough to overcome the hysteresis, the feedback com- parator shuts off the power section leaving only low power circuitry running until the output voltage falls again. This cycle repeats, keeping the output voltage within a small window. The switching action is as follows: The switch turns on, and current through it starts to ramp up until the OPERATIOU point where the current limit is reached, at which point the switch turns off for a fixed amount of time. While the switch is off the inductor is delivering current to the load. When the off time expires, the switch turns on again until the current limit is reached, and the cycle repeats. This chip includes an internal power Schottky diode and a PNP transistor for output disconnect. The PNP transistor disconnects the load from the input during shutdown. The PNP control circuitry is designed to keep the PNP out of saturation across a wide range of current, to keep quies- cent current to a minimum and to provide current limiting to protect the chip during short-circuit conditions. Burst Mode is a registered a trademark of Linear Technolgy Corporation. BLOCK DIAGRA W S R Q Q DELAY 12mVOUT OUT VREF 1.25V CTRL VIN SW GND OUT ANTI SAT 7 6 5 3 SHDN FB CAP 3464 BD CPL 0.1Ω

SWITCHI G TI E WAVEFOR S UW W Operating Waveforms Start up Waveforms Shutdown Waveforms CAP PIN VOLTAGE VOUT: THE OUTPUT DISCONNECT ALLOWS VOUT TO BE AT GROUND DURING SHUTDOWN 5V/DIV GND 1ms/DIV IL 0.1A/DIV VOUT 50mV/DIV 5µs/DIV IL 0.1A/DIV VOUT 10V/DIV 50µs/DIVVIN = 5V VOUT = 20V ILOAD = 1mA L = 22µH VIN = 5V SHDN

3464 F02

3464 F03

3464 F01

Table 1. Recommended Inductors maximum output current. Otherwise, use Equation 2. when the LT3464 is operating in continuous mode. when the LT3464 is operating in discontinuous mode. switch saturation voltage. See the Electrical Specifications. limited to 25mA by the output disconnect circuitry. maximum output current given V IN, VOUT and L values. Figure 3. Maximum Output Current Figure 1. Maximum Output Current

Table 2. Recommended Ceramic Capacitor Manufacturers inductor current, then delivering that current to the load. reduce this effect, a larger output capacitor may be used. chosen capacitor has a sufficient voltage rating. according to the following equation (see Figure 4). VREF = VCTRL if VCTRL is between 0V and 1.2V. cusses how to compensate for this drop.

CE(SAT) and low quiescent current. a value of at least 0.1µF is a good choice. Figure 5. This voltage drop (VDROP) can be accounted for the maximum junction temperature. inductor with a low saturation current. the inrush current should not be allowed to exceed 1 amp.

paid to the PCB board layout and component placement. Figure 6. Recommended Layout ommended component placement is shown in Figure 6.

3464 F07

2.3V TO 10V VOUT 15V SW GND OUT CAP FB LT3464 22µH 1µF 0.22µF 0.22µF 3.32M 301k 7 6

3464 TA02

C1: TAIYO YUDEN LMK107 BJ105MA-T C2: TAIYO YUDEN EMK107 BJ224MA-T C3: TAIYO YUDEN EMK107 BJ224MA-T L1: MURATA LQH32CN220K CTRL SHDN VIN VIN 2.3V TO 10V VOUT 34V SW GND OUT CAP FB LT3464 47µH 1µF 0.33µF 0.22µF 2.61M 100k 7 6

3464 TA03

C1: TAIYO YUDEN LMK107 BJ105MA-T C2: TAIYO YUDEN GMK212 BJ334MG-T C3: TAIYO YUDEN UMK212 BJ224MG-T L1: MURATA LQH32CN470K 15V Output Converter with Output Disconnect 34V Output Converter with Output Disconnect VIN (V) I OUT (mA) 3.6 3.5 5.0 4.5 8.4 7.5 VIN (V) I OUT (mA) 3.6 7.0 5.0 10.0 8.4 19.0 CTRL SHDN VIN VIN 2.3V TO 10V VOUT 20V SW GND OUT CAP FB LT3464 10µH 1µF 0.1µF 0.1µF 4.53M 301k 7 6

3464 TA04

C1: TAIYO YUDEN LMK107 BJ105MA-T C2: TAIYO YUDEN TMK107 BJ104MA-T C3: TAIYO YUDEN TMK107 BJ104MA-T L1: TAIYO YUDEN LB 2012T100MR 20V Output Converter with Output Disconnect Using an 0805 Inductor and 0603 Capacitors VIN (V) I OUT (mA) 3.6 3.0 5.0 4.0 8.4 6.0

2.3V TO 10V VOUT 20V SW GND OFF ON OUT CAP FB LT3464 22µH 1µF 0.1µF 0.33µF 0.22µF 4.53M 300k 301k 7 6

3464 TA06

C1: TAIYO YUDEN LMK107 BJ105MA-T C2: TAIYO YUDEN GMK212 BJ334MG-T C3: TAIYO YUDEN EMK107 BJ224MA-T L1: MURATA LQH32CN220K 20V Output Converter with Output Disconnect CTRL SHDN VIN VIN 2.3V TO 10V VOUT 20V SW GND OUT CAP FB LT3464 47µH 1µF 0.33µF 0.22µF 4.53M 301k 7 6

3464 TA05

C1: TAIYO YUDEN LMK107 BJ105MA-T C2: TAIYO YUDEN GMK212 BJ334MG-T C3: TAIYO YUDEN UMK212 BJ224MG L1: MURATA LQH32CN470K TYPICAL APPLICATIO SU VIN (V) I OUT (mA) 3.6 6.0 5.0 9.0 8.4 16.5 20V Output Converter with Soft Start VIN (V) I OUT (mA) 3.6 5.0 5.0 6.5 8.4 11.0

2.3V TO 7V VOUT SW GND OUT CAP FB LT3464 22µH 1µF 2.2µF 20pF 0.47µF 1.62M 301k 7 6

3464 TA07

C1: TAIYO YUDEN CE LMK107 BJ105MA-T C2: TAIYO YUDEN CE LMK212 BJ225MG-T C3: TAIYO YUDEN CE LMK107 BJ474MA-T L1: MURATA LQH32CN220K VIN (V) I OUT (mA) 3.6 13.5 5.0 20 TYPICAL APPLICATIO SU ±20V Dual Output Converter with Output Disconnect 8V Output Converter with Output Disconnect CTRL SHDN VIN VIN 2.3V TO 10V VOUT 20V –VOUT –20V SW GND OUT CAP FB LT3464 47µH 1µF 0.33µF 0.33µF 0.22µF 4.53M 301k 7 6

3464 TA08

0.33µF C1: TAIYO YUDEN LMK107 BJ105MA-T C2, C4, C5: TAIYO YUDEN GMK212 BJ334MG-T C3: TAIYO YUDEN UMK212 BJ224MG-T L1: MURATA LQH32CN470K D1, D2: CENTRAL CMDSH-3 IOUT = 2.5mA AT VIN = 3.6V IOUT = 2.5mA AT VIN = 3.6V

1.50 – 1.75 (NOTE 4)2.80 BSC 0.22 – 0.36

8 PLCS (NOTE 3)

DATUM ‘A’ 0.09 – 0.20 (NOTE 3) TS8 TSOT-23 0802

2.90 BSC

(NOTE 4)

0.65 BSC

1.95 BSC

0.80 – 0.90

1.00 MAX

0.01 – 0.100.20 BSC 0.30 – 0.50 REF PIN ONE ID NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193

3.85 MAX

0.52 MAX 0.65 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 1.4 MIN2.62 REF

1.22 REF

(Reference LTC DWG # 05-08-1637) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

PART NUMBER DESCRIPTION COMMENTS LT1613 550mA (I SW), 1.4MHz, High Efficiency V IN = 0.9V to 10V, VOUT(MAX) = 34V, IQ = 3mA, ISD = <1µA, Step-Up DC/DC Converter ThinSOT Package LT1615/ 300mA/80mA (I SW), Constant Off-Time, V IN = 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20µA, ISD = <1µA, LT1615-1 High Efficiency Step-Up DC/DC Converter ThinSOT Package LT1618 Constant Current, Constant Voltage, 1.4MHz, V IN = 1.6V to 18V, VOUT(MAX) = 34V, IQ = 1.8mA, ISD = <1µA, High Efficiency Boost Regulator MS Package, Up to 6 White LEDs LT1932 Constant Current, 1.2MHz, High Efficiency V IN = 1V to 10V, VOUT(MAX) = 34V, IQ = 1.2mA, ISD = <1µA, White LED Boost Regulator ThinSOT Package, Up to 8 White LEDs LT1937 Constant Current, 1.2MHz, High Efficiency V IN = 2.5V to 10V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD = <1µA, White LED Boost Regulator SC-70, ThinSOT Packages, Up to 4 White LEDs LT1944 Dual Output 350mA (I SW), Constant Off-Time, V IN = 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20µA, ISD = <1µA, High Efficiency Step-Up DC/DC Converter MS Package LT1944-1 Dual Output 150mA (I SW), Constant Off-Time, V IN = 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20µA, ISD = <1µA, High Efficiency Step-Up DC/DC Converter MS Package LT1945 Dual Output, ±350mA (ISW), Constant Off-Time, V IN = 1.2V to 15V, VOUT(MAX) = ±34V, IQ = 20µA, ISD = <1µA, High Efficiency Step-Up DC/DC Converter MS Package LTC3200/ Low Noise, 2MHz, Regulated Charge Pump V IN = 2.7V to 4.5V, IQ = 8mA, ISD = <1µA, LTC3200-5 White LED Driver MS, ThinSOT Packages, Up to 6 White LEDs LTC3201 Low Noise, 1.7MHz, Regulated Charge Pump V IN = 2.7V to 4.5V, IQ = 6.5mA, ISD = <1µA, White LED Driver MS Package, Up to 6 White LEDs LTC3202 Low Noise, 1.5MHz, Regulated Charge Pump V IN = 2.7V to 4.5V, IQ = 5mA, ISD = <1µA, White LED Driver MS Package, Up to 8 White LEDs LTC3400/ 600mA (I SW), 1.2MHz, Synchronous V IN = 0.85V to 5V, VOUT(MAX) = 5V, IQ = 19µA/300µA, ISD = <1µA, LTC3400B Step-Up DC/DC Converter ThinSOT Package LTC3401 1A (I SW), 3MHz, Synchronous V IN = 0.5V to 5V, VOUT(MAX) = 6V, IQ = 38µA, ISD = <1µA, Step-Up DC/DC Converter MS Package LTC3402 2A (I SW), 3MHz, Synchronous V IN = 0.5V to 5V, VOUT(MAX) = 6V, IQ = 38µA, ISD = <1µA, Step-Up DC/DC Converter MS Package Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 l FAX: (408) 434-0507 l www.linear.com  LINEAR TECHNOLOGY CORPORATION 2003 LT/TP 0204 1K • PRINTED IN USA RELATED PARTS 20V Output Converter with Variable Output Voltage and Shutdown CTRL SHDN VIN VIN 2.3V TO 10V VOUT 20V SW GND OUT CAP FB LT3464 22µH 1µF 0.33µF 0.22µF 4.53M 301k 7 6

3464 TA09

C1: TAIYO YUDEN LMK107 BJ105MA-T C2: TAIYO YUDEN GMK212 BJ334MG-T C3: TAIYO YUDEN GMK212 BJ224MG-T L1: MURATA LQH32CN220K DAC µC VIN (V) I OUT (mA) 3.6 5.0 5.0 6.5 8.4 11.0 TYPICAL APPLICATIO SU

Selected Specification

Linear Technology LTG2 overview.

Summary

Micropower Boost Converter with Schottky and Output Disconnect in ThinSOT?

Description

Micropower Boost Converter with Schottky and Output Disconnect in ThinSOT?

Source title LTG2 Datasheet(PDF) - Linear Technology

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