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LT1616| Datasheet

By datasheet - November 4th, 2008

LT1616| Datasheet

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LT1616 600mA, 1.4MHz Step-Down Switching Regulator in SOT-23

FEATURES
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DESCRIPTIO

Wide Input Range: 3.6V to 25V 5V at 400mA from 7V to 25V Input 3.3V at 400mA from 4.7V to 25V Input Fixed Frequency 1.4MHz Operation Uses Tiny Capacitors and Inductors Internally Compensated Low Shutdown Current: <1uA Low VCESAT Switch: 220mV at 300mA Tiny 6-Lead SOT-23 Package

APPLICATIO S
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The LT 1616 is a current mode PWM step-down DC/DC converter with internal 0.6A power switch, packaged in a tiny 6-lead SOT-23. The wide input range of 3.6V to 25V makes the LT1616 suitable for regulating a wide variety of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers and lead-acid batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors. With its internal compensation eliminating additional components, a complete 400mA step-down regulator fits onto 0.15 square inches of PC board area. The constant frequency current mode PWM architecture and stable operation with ceramic capacitors results in low, predictable output ripple. Current limiting provides protection against shorted outputs. The low current (<1uA) shutdown provides complete output disconnect, enabling easy power management in battery-powered systems.
, LTC and LT are registered trademarks of Linear Technology Corporation.

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Wall Transformer Regulation Local Logic Supply Conversion: 12V to 5V 12V or 5V to 3.3V, 2.5V or 1.8V Distributed Supply Regulation Digital Cameras Battery-Powered Equipment

TYPICAL APPLICATIO

3.3V Step-Down Converter
VIN 4.5V TO 25V 5 VIN BOOST LT1616 OFF ON 4 SHDN GND 2 C1 1uF SW FB 3 R2 10k 6 R1 16.5k 1 D2 C3 0.01uF L1 10uH
100 90

EFFICIENCY (%)

D1

VOUT 3.3V 300mA: VIN = 4.5V TO 25V 400mA: VIN = 4.7V TO 25V C2 10uF

C1: TAIYO-YUDEN TMK316BJ105 C2: TAIYO-YUDEN JMK316BJ106ML D1: ON SEMICONDUCTOR MBR0530 D2: 1N4148 L1: SUMIDA CR43-100

1616 TA01

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Efficiency
VIN = 5V VIN = 12V 80 70 60 50 40 30 0 100 200 300 400 LOAD CURRENT (mA) 500
1616 G02

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VIN = 20V

1


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