LT1766| Datasheet

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LT1766/LT1766-5 5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator
FEATURES

DESCRIPTIO

Wide Input Range: 5.5V to 60V 1.5A Peak Switch Current Constant 200kHz Switching Frequency Saturating Switch Design: 0.2 Peak Switch Current Rating Maintained Over Full Duty Cycle Range Low Effective Supply Current: 2.5mA Low Shutdown Current: 25uA 1.2V Feedback Reference Voltage (LT1766) 5V Fixed Output (LT1766-5) Easily Synchronizable Cycle-by-Cycle Current Limiting Small 16-Pin SSOP and Thermally Enhanced TSSOP Packages

The LT 1766/LT1766-5 are 200kHz monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 1.5A, 0.2 switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode control architecture delivers fast transient response and excellent loop stability. Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry* maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 25uA and the device can be externally synchronized from 228kHz to 700kHz with logic level inputs. The LT1766/LT1766-5 are available in a 16-pin fused-lead SSOP package or a TSSOP package with exposed backside for improved thermal performance.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Protected by U.S. Patents including 6498466, 6531909

APPLICATIO S

High Voltage, Industrial and Automotive Portable Computers Battery-Powered Systems Battery Chargers Distributed Power Systems

TYPICAL APPLICATIO
6 VIN 5.5V* TO 60V BOOST 4 2.2uF 100V CERAMIC OFF ON 15 14

5V Buck Converter
1N4148W

0.33uF SW 2

47uH

VIN LT1766 SHDN SYNC GND

10MQ060N

VOUT 5V 1A

+
BIAS FB VC 11 220pF 10 12 15.4k 4.99k

100uF 10V SOLID TANTALUM
EFFICIENCY (%)

1, 8, 9, 16 2.2k 0.022uF

1766 TA01

*FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY TDK C4532X7R2A225K

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Efficiency vs Load Current
100 VOUT = 5V L = 47uH VIN = 12V 90 VIN = 42V 80 70 60 50 0 0.25 0.75 1.00 0.50 LOAD CURRENT (A) 1.25
1766 TA02

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1766fb

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LT1766 DATASHEET