Datasheet LT3462, LT3462A (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky |
| Pages / Page | 12 / 7 — TYPICAL APPLICATIONS. 3.3V to –12V with Soft-Start Circuit. –12V … |
| Revision | A |
| File Format / Size | PDF / 480 Kb |
| Document Language | English |
TYPICAL APPLICATIONS. 3.3V to –12V with Soft-Start Circuit. –12V Efficiency. VOUT Reaches –12V in 750µs; Input
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Text Version of Document
LT3462/LT3462A
TYPICAL APPLICATIONS 3.3V to –12V with Soft-Start Circuit –12V Efficiency
80 L1 C2 L2 TA = 25°C 47µH 1µF 47µH VIN 75 3.3V VIN = 3.3V VOUT 70 –12V R1 C4 30mA SW D 267k 15pF C3 65 C1 VIN FB 2.2µF 4.7µF C LT3462 R2 S1 100nF EFFICIENCY (%) 60 27.4k SDREF GND 55 OFF M1 22nF 50 C1: TAIYO YUDEN X5R JMK212BJ475MG 0 5 10 15 20 25 30 35 3462 TA02a C2: TAIYO YUDEN X5R EMK212BJ105MG LOAD CURRENT (mA) 3462 TA02b C3: TAIYO YUDEN EMK316BJ225 L1, L2: MURATA LQH32CN470
VOUT Reaches –12V in 750µs; Input VOUT Reaches –12V in 7.5ms; Input Current Peaks at 300mA without CS1 Current Peaks at 125mA with CS1 = 100nF
OFF OFF VOUT VOUT 10V/DIV 10V/DIV I I IN IN 100mA/DIV 50mA/DIV 2ms/DIV 3462 TA02c 2ms/DIV 3462 TA02d
Li+ to –8V Supply –8V Efficiency
80 L1A C2 L1B TA = 25°C 22µH 1µF 22µH VIN 75 2.7V VIN = 3.3V TO 4.2V VOUT 70 R1 –8V C4 SW D 267k 15pF 65 C1 VIN FB 4.7µF LT3462 R2 C3 EFFICIENCY (%) 60 42.2k 4.7µF SDREF GND 55 50 C1: TAIYO YUDEN X5R JMK212BJ475MG 0 10 20 30 40 50 3462 TA03a C2: TAIYO YUDEN X5R EMK212BJ105MG LOAD CURRENT (mA) 3462 TA03b C3: TAIYO YUDEN LMK316BJ475 L1: SUMIDA CLS62-220 OR 2X MURATA LQH32CN330 Rev A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL APPLICATIONS 3.3V to –12V with Soft-Start Circuit –12V Efficiency
80 L1 C2 L2 TA = 25°C 47µH 1µF 47µH VIN 75 3.3V VIN = 3.3V VOUT 70 –12V R1 C4 30mA SW D 267k 15pF C3 65 C1 VIN FB 2.2µF 4.7µF C LT3462 R2 S1 100nF EFFICIENCY (%) 60 27.4k SDREF GND 55 OFF M1 22nF 50 C1: TAIYO YUDEN X5R JMK212BJ475MG 0 5 10 15 20 25 30 35 3462 TA02a C2: TAIYO YUDEN X5R EMK212BJ105MG LOAD CURRENT (mA) 3462 TA02b C3: TAIYO YUDEN EMK316BJ225 L1, L2: MURATA LQH32CN470
VOUT Reaches –12V in 750µs; Input VOUT Reaches –12V in 7.5ms; Input Current Peaks at 300mA without CS1 Current Peaks at 125mA with CS1 = 100nF
OFF OFF VOUT VOUT 10V/DIV 10V/DIV I I IN IN 100mA/DIV 50mA/DIV 2ms/DIV 3462 TA02c 2ms/DIV 3462 TA02d
Li+ to –8V Supply –8V Efficiency
80 L1A C2 L1B TA = 25°C 22µH 1µF 22µH VIN 75 2.7V VIN = 3.3V TO 4.2V VOUT 70 R1 –8V C4 SW D 267k 15pF 65 C1 VIN FB 4.7µF LT3462 R2 C3 EFFICIENCY (%) 60 42.2k 4.7µF SDREF GND 55 50 C1: TAIYO YUDEN X5R JMK212BJ475MG 0 10 20 30 40 50 3462 TA03a C2: TAIYO YUDEN X5R EMK212BJ105MG LOAD CURRENT (mA) 3462 TA03b C3: TAIYO YUDEN LMK316BJ475 L1: SUMIDA CLS62-220 OR 2X MURATA LQH32CN330 Rev A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
