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LT1615

Linear Technology
Part Number LT1615
Manufacturer Linear Technology
Description Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter
Published Mar 22, 2005
Detailed Description LT1615/LT1615-1 Micropower Step-Up DC/DC Converters in SOT-23 FEATURES s DESCRIPTIO s s s s s Low Quiescent Current:...
Datasheet PDF File LT1615 PDF File

LT1615
LT1615

Overview
LT1615/LT1615-1 Micropower Step-Up DC/DC Converters in SOT-23 FEATURES s DESCRIPTIO s s s s s Low Quiescent Current: 20µA in Active Mode <1µA in Shutdown Mode Operates with VIN as Low as 1V Low VCESAT Switch: 250mV at 300mA Tiny 5-Lead SOT-23 Package Uses Small Surface Mount Components High Output Voltage: Up to 34V U APPLICATIO S s s s s LCD Bias Handheld Computers Battery Backup Digital Cameras The LT®1615/LT1615-1 are micropower step-up DC/DC converters in a 5-lead SOT-23 package.
The LT1615 is designed for higher power systems with a 350mA current limit and an input voltage range of 1.
2V to 15V, whereas the LT1615-1 is intended for lower power and single-cell applications with a 100mA current limit and an extended input voltage range of 1V to 15V.
Otherwise, the two devices are functionally equivalent.
Both devices feature a quiescent current of only 20µA at no load, which further reduces to 0.
5µA in shutdown.
A current limited, fixed offtime control scheme conserves operating current, resulting in high efficiency over a broad range of load current.
The 36V switch allows high voltage outputs up to 34V to be easily generated in a simple boost topology without the use of costly transformers.
The LT1615’s low off-time of 400ns permits the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO L1 10µH 1-Cell Li-Ion to 20V Converter for LCD Bias 85 D1 20V 12mA SW LT1615 SHDN C1 4.
7µF GND FB R2 130k 1615/-1 TA01 VIN 2.
5V TO 4.
2V VIN 80 VIN = 4.
2V 75 EFFICIENCY (%) R1 2M C2 1µF 70 65 60 55 50 0.
1 C1: TAIYO YUDEN LMK316BJ475 C2: TAIYO YUDEN TMK316BJ105 D1: MOTOROLA MBR0530 L1: MURATA LQH3C100K24 0.
3 U Efficiency VIN = 2.
5V VIN = 3.
3V 1 3 10 LOAD CURRENT (mA) 30 1615/-1 TA01a U 1 LT1615/LT1615-1 ABSOLUTE (Note 1) AXI U RATI GS U W U PACKAGE/ORDER I FOR ATIO TOP VIEW SW 1 GND 2 FB 3 4 SHDN 5 V...


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