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LT1617| Datasheet

By datasheet - November 4th, 2008

LT1617| Datasheet

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LT1617/LT1617-1 Micropower Inverting DC/DC Converters in SOT-23

FEATURES
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DESCRIPTIO

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Low Quiescent Current: 20uA in Active Mode <1uA in Shutdown Mode Operates with VIN as Low as 1V Low VCESAT Switch: 250mV at 300mA Uses Small Surface Mount Components High Output Voltage: Up to 34V Tiny 5-Lead SOT-23 Package

APPLICATIO S
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LCD Bias Handheld Computers Battery Backup Digital Cameras

The LT 1617/LT1617-1 are micropower inverting DC/DC converters in a 5-lead SOT-23 package. The LT1617 is designed for higher power systems with a 350mA current limit and an input voltage range of 1.2V to 15V, whereas the LT1617-1 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 20uA at no load, which further reduces to 0.5uA 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 without the use of costly transformers. The LT1617'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 APPLICATION
1-Cell Li-Ion to 15V Inverting Converter
L1 22uH 5 VIN LT1617 4 C1 4.7uF SHDN GND 2 NFB 3 24.9k C3 0.22uF 1 SW D1 267k C2 4.7uF L2 22uH

80
15V 12mA EFFICIENCY (%)

VIN 2.5V TO 4.2V

75 70 65 60 55

C1: TAIYO YUDEN LMK316BJ475 C2: TAIYO YUDEN EMK316BJ475 C3: TAIYO YUDEN TMK316BJ224 L1, L2: MURATA LQH3C220K34 D1: MOTOROLA MBR0530

1617/-1 TA01

50 0.1

U
Efficiency
VIN = 4.2V VIN = 2.5V 1 10 LOAD CURRENT (mA) 30
1617/-1 TA01a

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1


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