LINEAR TECHNOLOGY LT1956 LT1956-5 Specifications User Guide
Summary
The LT1956 series are high-efficiency, 1.5A step-down switching regulators designed for demanding applications requiring stable power from wide input voltages (up to 60V). Featuring advanced current mode control, these robust converters maintain peak performance and efficiency across a full duty cycle range. This manual provides comprehensive technical specifications, operational guidelines, detailed application circuits, and packaging information needed for integration into portable computers, battery chargers, and distributed industrial/automotive power systems.
Page 1 Text Content
LT1956/LT1956-5 High Voltage, 1.5A, 500k Hz Step-Down Switching Regulators
FEATURES DESCRIPTIO
®1956/LT1956-5 are 500k Hz monolithic buck
Wide Input Range: 5.5V to 60V The LT 1.5A Peak Switch Current switching regulators with an input voltage capability up to Small 16-Pin SSOP or Thermally Enhanced 60V. A high efficiency 1.5A, 0.2Ω switch is included on the
TSSOP Package die along with all the necessary oscillator, control and logic
Saturating Switch Design: 0.2Ω circuitry. A current mode architecture provides fast tran- Peak Switch Current Maintained Over sient response and good loop stability. Full Duty Cycle Range
Special design techniques and a new high voltage process
Constant 500k Hz Switching Frequency
achieve high efficiency over a wide input range. Efficiency
Effective Supply Current: 2.5m A
is maintained over a wide output current range by using the
Shutdown Current: 25µA
output to bias the circuitry and by utilizing a supply boost
1.2V Feedback Reference (LT1956)
capacitor to saturate the power switch. Patented circuitry
5V Fixed Output (LT1956-5)
maintains peak switch current over the full duty cycle
Easily Synchronizable
range*. A shutdown pin reduces supply current to 25µA and
Cycle-by-Cycle Current Limiting
the device can be externally synchronized from 580k Hz to 700k Hz with a logic level input.
APPLICATIO S
EF FI CI EN CY
The LT1956/LT1956-5 are available in fused-lead 16-pin
High Voltage, Industrial and Automotive
SSOP and thermally enhanced TSSOP packages.■
Portable Computers
, LTC and LT are registered trademarks of Linear Technology Corporation. Battery-Powered Systems *U.S. PATENT NO. 6,498,466
Battery Chargers Distributed Power Systems
TYPICAL APPLICATIO
5V Buck Converter Efficiency vs Load Current
MMSD914TI
VIN = 12V L = 18µH
VOUT = 5V
VIN BOOST
10µH VOUT
VIN SW 5V
(TRANSIENTS VOUT = 3.3V
TO 60V) 10MQ060N
100V LT1956-5
CERAMIC
6.3V SHDN BIAS CERAMIC
SYNC FB
VCGND
4.7k LOAD CURRENT (A)
1956 TA02
†UNITED CHEMI-CON THCS50EZA225ZT
1956 TA01
Page Summary Contents For LINEAR TECHNOLOGY LT1956 LT1956-5 Specifications User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 304.52 KB |
| Published | June 19, 2026 |
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Frequently Asked Questions
What is the input voltage range for this regulator?
The LT1956/LT1956-5 supports a wide input range from 5.5V to 60V.
Do these regulators support external synchronization?
Yes, the device can be externally synchronized with a logic level input ranging from 580kHz to 700kHz.
What is the shutdown current of the LT1956-5?
The shutdown pin reduces supply current down to 25mA.