LT1931 - 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT

The LT1931/LT1931A operate in a dual inductor inverting topology that filters both the input side and output side current. Very low output voltage ripple approaching 1mVP-P can be achieved when ceramic output capacitors are used. Fixed frequency switching ensures a clean output free from low frequency noise typically present with charge pump solutions. The low impedance output remains within 1% of nominal during large load steps. The 36V switch allows VIN to VOUT differential of up to 34V.

The LT1931/LT1931A are available in the 5-lead ThinSOT package.

Features

Fixed Frequency 1.2MHz/2.2MHz Operation
Very Low Noise: 1mVP-P Output Ripple
–5V at 350mA from 5V Input
–12V at 150mA from 5V Input
Uses Small Surface Mount Components
Wide Input Range: 2.6V to 16V
Low Shutdown Current: <1µA
Low VCESAT Switch: 400mV at 1A
Pin-for-Pin Compatible with the LT1611
Low Profile (1mm) ThinSOT™ Package

Typical Application

Applications

Disk Drive MR Head Bias
Digital Camera CCD Bias
LCD Bias
GaAs FET Bias
Local Low Noise/Low Impedance Negative Supply

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LT1931AES5#PBF	SOT-23	E	$2.46
LT1931AES5#TRMPBF	SOT-23	E	$2.46	$2.08
LT1931AES5#TRPBF	SOT-23	E	$2.46	$2.06
LT1931AIS5#PBF	SOT-23	I	$3.07
LT1931AIS5#TRMPBF	SOT-23	I	$3.07	$2.18
LT1931AIS5#TRPBF	SOT-23	I	$3.07	$2.16
LT1931ES5#PBF	SOT-23	E	$2.46
LT1931ES5#TRMPBF	SOT-23	E	$2.46	$2.08
LT1931ES5#TRPBF	SOT-23	E	$2.46	$2.06
LT1931IS5#PBF	SOT-23	I	$3.07
LT1931IS5#TRMPBF	SOT-23	I	$3.07	$2.18
LT1931IS5#TRPBF	SOT-23	I	$3.07	$2.16

Demo Boards

Part Number	Description	Price
DC383B	LTC1930ES5/LTC1931ES5 Demo Board \| 3 Circuits: Boost/SEPIC/Inverter, 5Vin to 12Vout1@300mA, 10V-16Vin to 12Vout2@300mA, 12Vin to -12Vout3@350mA	$75.00
DC397A	LT1930AES5/LT1931AES5 Demo Board \| 3 Circuits: Boost/SEPIC/Inverter: 5Vin to 12Vout1@250mA, 10V-16Vin to 12Vout2@250mA, 12Vin to -12Vout3@250mA	$75.00