LT1946A - 2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start

The LT1946A is a fixed frequency step-up DC/DC converter containing an internal 1.5A, 36V switch. Capable of generating 12V at 430mA from a 5V input, the LT1946A is ideal for powering large TFT-LCD panels. The LT1946A switches at 2.7MHz, allowing the use of tiny, low profile inductors and low value ceramic capacitors. Loop compensation can be either internal or external, giving the user flexibility in setting loop compensation and allowing optimized transient response with low ESR ceramic output capacitors. Soft-start is controlled with an external capacitor which determines the input current ramp rate during start up. The 8-lead MSOP package and high switching frequency ensure a low profile overall solution less than 1.1mm high.

Features

1.5A, 36V Internal Switch
2.7MHz Switching Frequency
Integrated Soft-Start Function
Adjustable Output from VIN to 35V
Low VCESAT Switch: 300mV at 1.5A (Typical)
12V at 430mA from a 5V Input
Small Thermally Enhanced 8-Lead MSOP Package

Typical Application

Applications

TFT-LCD Bias Supplies
GPS Receivers
DSL Modems
Local Power Supply

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LT1946AEMS8E#PBF	MS-8	E	$2.08	$1.75
LT1946AEMS8E#TRPBF	MS-8	E		$1.81

Demo Boards

Part Number	Description	Price
DC459A	LT1946EMS8 LT1946AEMS8E \| 12Vout Boost Converter, +5Vin, +12Vout/400mA and Triple Output TFT LCD Bias Supply, 3.3Vin, Vout=+23V/5mA, +8V/350mA, -8V/10mA	Contact Factory