LINEAR TECHNOLOGY LT1766 LT1766-5 Specifications User Guide
Summary
This datasheet describes the Linear Technology LT1766 and LT1766-5 monolithic buck switching regulators accepting 5.5V to 60V input with an integrated 1.5A peak switch rated at 0.2Ω. Operating at a constant 200kHz switching frequency with current mode control for fast transient response, the devices maintain peak switch current over the full duty cycle range using patented circuitry. The LT1766 provides a 1.2V feedback reference for adjustable output, while the LT1766-5 delivers a fixed 5V outpu
Page 1 Text Content
LT1766/LT1766-5
5.5V to 60V 1.5A, 200k Hz Step-Down Switching Regulator
FEATURES DESCRIPTIO
®1766/LT1766-5 are 200k Hz monolithic buck
Wide Input Range: 5.5V to 60V The LT 1.5A Peak Switch Current switching regulators that accept input voltages up to 60V.
Constant 200k Hz Switching Frequency A high efficiency 1.5A, 0.2Ω switch is included on the die
Saturating Switch Design: 0.2Ω along with all the necessary oscillator, control and logic cir- Peak Switch Current Rating Maintained Over cuitry. A current mode control architecture delivers fast
Full Duty Cycle Range transient response and excellent loop stability.
Low Effective Supply Current: 2.5m A
Special design techniques and a new high voltage process
Low Shutdown Current: 25µA
achieve high efficiency over a wide input range. Efficiency
1.2V Feedback Reference Voltage (LT1766)
is maintained over a wide output current range by using the
5V Fixed Output (LT1766-5)
output to bias the circuitry and by utilizing a supply boost
Easily Synchronizable
capacitor to saturate the power switch. Patented circuitry*
Cycle-by-Cycle Current Limiting
maintains peak switch current over the full duty cycle range.
Small 16-Pin SSOP and Thermally Enhanced
A shutdown pin reduces supply current to 25µA and the
TSSOP Packages
device can be externally synchronized from 228k Hz to 700k Hz with logic level inputs.
APPLICATIO S
The LT1766/LT1766-5 are available in a 16-pin fused-lead
High Voltage, Industrial and Automotive
SSOP package or a TSSOP package with exposed backside
EF FI CI EN CY
Portable Computers
for improved thermal performance.
Battery-Powered Systems
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
Battery Chargers trademarks are the property of their respective owners. *Protected by U.S. Patents
including 6498466, 6531909
Distributed Power Systems
TYPICAL APPLICATIO
5V Buck Converter
BOOST 47µH
VIN VOUT Efficiency vs Load Current 5.5V* VIN SW 5V TO 60V 2.2µF† 1A
10MQ060N VOUT = 5V
100V LT1766
L = 47µH VIN = 12V
CERAMIC 100µF 10V
SOLID
ONOFF SHDN BIAS
TANTALUM
15.4k VIN = 42V
SYNC FB
VCGND 4.99k
1766 TA01 LOAD CURRENT (A)
FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY 1766 TA02
TDK C4532X7R2A225K
1766fb
Page Summary Contents For LINEAR TECHNOLOGY LT1766 LT1766-5 Specifications User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 308.96 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What is the optimal operating temperature range for this regulator?
The datasheet lists multiple ranges; specific grades vary, but some models support -40°C to 125°C or even –40°C to 140°C.
How does the LT1766-5 maintain its fixed output voltage?
It uses a 5V output to bias the circuitry and implements supply boosting for stable output.
What features are included for reliability and stability?
Features include current mode control architecture, Cycle-by-Cycle Current Limiting, and saturating switch design with reduced internal resistance (0.2Ω).