LT3471

Features:

1.2MHz Switching Frequency
Low VCESAT Switches: 330mV at 1.3A
High Output Voltage: Up to 40V
Wide Input Range: 2.4V to 16V
Inverting Capability
5V at 630mA from 3.3V Input
12V at 320mA from 5V Input
12V at 200mA from 5V Input
Uses Tiny Surface Mount Components
Low Shutdown Current: <1µA
Low Profile (0.75mm) 10-Lead 3mm * 3mm DFN Package


Application

Organic LED Power Supply
Digital Cameras
White LED Power Supply
Cellular Phones
Medical Diagnostic Equipment
Local ±5V or ±12V Supply
TFT-LCD Bias Supply
xDSL Power Supply


Specifications

VIN Voltage .............................................................. 16V
SW1, SW2 Voltage ....................................0.4V to 42V
FB1N, FB1P, FB2N, FB2P Voltage ....... 12V or VIN  1.5V
SHDN/SS1, SHDN/SS2 Voltage .............................. 16V
VREF Voltage ........................................................... 1.5V
Maximum Junction Temperature ......................... 125°C
Operating Temperature Range (Note 2) .. 40°C to 85°C
Storage Temperature Range ................. 65°C to 125°C

Description

The LT®3471 dual switching regulator combines two 42V,1.3A switches with error amplifiers that can sense to ground providing boost and inverting capability. The low VCESAT bipolar switches enable the device to deliver high
current outputs in a small footprint. The LT3471 switches at 1.2MHz, allowing the use of tiny, low cost and low
profile inductors and capacitors. High inrush current at start-up is eliminated using the programmable soft-start
function, where an external RC sets the current ramp rate. A constant frequency current mode PWM architecture
results in low, predictable output noise that is easy to filter.

The LT3471 switches are rated at 42V, making the device ideal for boost converters up to ±40V as well as SEPIC and
flyback designs. Each channel can generate 5V at up to 630mA from a 3.3V supply, or 5V at 510mA from four

alkaline cells in a SEPIC design. The device can be configured as two boosts, a boost and inverter or two inverters.
The LT3471 is available in a low profile (0.75mm) 10-lead 3mm × 3mm DFN package.