LINEAR TECHNOLOGY LT1946A Data Sheet
Summary
The LT1946A is a high-efficiency step-up DC/DC converter featuring an integrated 1.5A switch and sophisticated Soft-Start functionality, delivering adjustable power up to 35V. Ideal for powering large TFT-LCD panels, GPS receivers, and other low-voltage communication modules. This manual serves as comprehensive technical documentation for system designers, detailing critical electrical characteristics, application circuits, efficiency curves, and performance guarantees needed to implement robust, highly reliable power solutions in professional electronics designs.
Page 1 Text Content
LT1946A
2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
FEATURES DESCRIPTIO 1.5A, 36V Internal Switch The LT®1946A is a fixed frequency step-up DC/DC con- 2.7MHz Switching Frequency verter containing an internal 1.5A, 36V switch. Capable of Integrated Soft-Start Function generating 12V at 430m A from a 5V input, the LT1946A is Adjustable Output from VIN to 35V ideal for powering large TFT-LCD panels. The LT1946A
Low VCESAT Switch: 300m V at 1.5A (Typical) switches at 2.7MHz, allowing the use of tiny, low profile 12V at 430m A from a 5V Input inductors and low value ceramic capacitors. Loop com- Small Thermally Enhanced 8-Lead MSOP Package pensation can be either internal or external, giving the user flexibility in setting loop compensation and allowing opti- mized transient response with low ESR ceramic output
APPLICATIO S
capacitors. Soft-start is controlled with an external capaci- tor which determines the input current ramp rate during
TFT-LCD Bias Supplies
start up. The 8-lead MSOP package and high switching
GPS Receivers EF FI CI EN CY
frequency ensure a low profile overall solution less than
DSL Modems
1.1mm high.
Local Power Supply
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
D1 Efficiency
2.2µH VOUT
VIN SW
OFF ON SHDN C1 LT1946A FB 2.2µF C2
VC COMP
GND*SS
CC CSS 270p F 100n F
C1: 2.2µF, X5R or X7R, 6.3V 1946A TA01
C2: 2.2µF, X5R or X7R, 16V D1: MICROSEMI UPS120 OR EQUIVALENT L1: SUMIDA CR43-2R2 * EXPOSED PAD MUST ALSO BE GROUNDED
LOAD CURRENT (m A)
Figure 1. 5V to 12V, 430m A Step-Up DC/DC Converter 1946A TA01
sn1946a 1946afs
Page Summary Contents For LINEAR TECHNOLOGY LT1946A Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 12 |
| File Size | 312.58 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the operating temperature range for this converter?
The operating temperature range is –40°C to 85°C.
Does it have a soft-start function and how is it controlled?
Yes, it has integrated soft-start functionality. It is controlled by an external capacitor which determines the input current ramp rate.
How low can the device detect a switch point?
The device switches at 300mV with a current of 1.5A (typical).
What are the recommended types for capacitors C1 and C2?
C1 should be X5R or X7R, 6.3V, and C2 should be X5R or X7R, 16V.