LINEAR TECHNOLOGY LTC1142 LTC1142L LTC1142HV Dual High Efficiency Synchronous Step-Down Switching Regulators Data Manual User Guide
Summary
These high-efficiency dual step-down switching regulators are engineered for demanding power delivery in space-constrained, battery-powered systems. Offering exceptional efficiency (over 95%) and constant off-time regulation, the LTC1142 series provides extremely stable 3.3V/5V outputs across a wide input voltage range (as low as 3.5V). This manual details critical parameters, operating modes, and performance characteristics, making it essential for designing portable instruments, notebook computers, and robust DC power distribution systems that require reliable, long-lasting operation.
Page 1 Text Content
LTC1142/LTC1142L/LTC1142HV Dual High Efficiency Synchronous Step-Down Switching Regulators FEATURES DESCRIPTIO Dual Outputs: 3.3V and 5V or User Programmable The LTC®1142/LTC1142L/LTC1142HV are dual synchro- Ultrahigh Efficiency: Over 95% Possible nous step-down switching regulator controllers featuring Current Mode Operation for Excellent Line and Load automatic Burst Mode TM operation to maintain high efficien- Transient Response cies at low output currents. The devices are composed of two High Efficiency Maintained over 3 Decades of separate regulator blocks, each driving a pair of external Output Current complementary power MOSFETs, at switching frequencies Low Standby Current at Light Loads: 160µA/Output up to 250k Hz, using a constant off-time current mode archi- Independent Micropower Shutdown: IQ < 40µA tecture providing constant ripple current in the inductor.
Wide VIN Range: 3.5V to 20V
The operating current level for both regulators is user pro-
Very Low Dropout Operation: 100% Duty Cycle
grammable via an external current sense resistor. Wide input
Synchronous FET Switching for High Efficiency
supply range allows operation from 3.5V* to 18V (20V
Available in Standard 28-Pin SSOP
maximum). Constant off-time architecture provides low drop- out regulation limited only by the RDS(ON) of the external APPLICATIO MOSFET and resistance of the inductor and current sense resistor.
Notebook and Palmtop Computers
The LTC1142 series is ideal for applications requiring dual
Battery-Operated Digital Devices
output voltages with high conversion efficiencies over a wide
Portable Instruments
load current range in a small amount of board space.
DC Power Distribution Systems
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN 5.2V TO 18V
0V = NORMAL 25V
>1.5V = SHDN × 2
P-CH P-CH Si9430DY VIN3 Si9430DY
SHDN3 SHDN5 VIN5
RSENSE3 L1 L2 RSENSE5
PDRIVE 3 PDRIVE 5
0.05ΩVOUT3 50µH 50µH 0.05Ω
VOUT5
SENSE+ 3 LTC1142HV SENSE+ 5
SENSE– 3 SENSE– 5
NDRIVE 3 NDRIVE 5
MBRS130L MBRS130L
N-CH PGND3 SGND3 CT3 ITH3 ITH5 CT5 SGND5 PGND5 N-CH
COUT3 COUT5
Si9410DY Si9410DY
RC3 RC5
RSENSE3, RSENSE5 : DALE WSL-2010-.05 L1, L2: COILTRONICS CTX50-2-MP CT3 CC3 CC5 CT5 PINS 5, 7, 8, 19, 21, 22: NC 560p F 3300p F 3300p F 390p F
1142 F01NOTE: COMPONENTS OPTIMIZED FOR HIGHEST EFFICIENCY, NOT MINIMUM BOARD SPACE.
Figure 1. High Efficiency Dual 3.3V, 5V Supply
Page Summary Contents For LINEAR TECHNOLOGY LTC1142 LTC1142L LTC1142HV Dual High Efficiency Synchronous Step-Down Switching Regulators Data Manual User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 248.17 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the maximum efficiency of this step-down regulator?
It offers Ultrahigh Efficiency, exceeding 95%.
Does it function correctly at low loads or during standby?
Yes, it features a constant off-time architecture with a low standby current below 40mA.
What is the supported input voltage range for this device?
The operating range allows operation from 3.5V up to 20V (LTC1142HV).
What types of applications are ideal for the LTC1142 series?
It is ideal for notebooks, portable instruments, and DC power distribution needing dual voltage outputs.