LT1614

Features:

*Better Regulation Than a Charge Pump
*0.1Ω Effective Output Impedance
* 5V at 200mA from a 5V Input
* 600kHz Fixed Frequency Operation
* Operates with VIN as Low as 1V
*1mA Quiescent Current
*Low Shutdown Current: 10µA
* Low-Battery Detector
* Low VCESAT Switch: 295mV at 500mA


Application

*MR Head Bias
*LCD Bias
*GaAs FET Bias
* Positive-to-Negative Conversion


Specifications

VIN, SHDN, LBO Voltage .........................................  12V
SW Voltage ..............................................  0.4V to 30V
NFB Voltage ..........................................................  3V
VC Voltage ..............................................................  2V
LBI Voltage .........................................  0V VLBI 1V
Current into FB Pin ............................................  ±1mA
Junction Temperature ........................................125°C
Operating Temperature Range
LT1614C.................................................  0°C to 70°C
LT1614I ...........................................  40°C to 85°C
Extended Commercial
Temperature Range (Note 1) ........... 40°C to 85°C
Storage Temperature Range .........  65°C to 150°C
Lead Temperature (Soldering, 10 sec)............  300°C


Description

The LT®1614 is a fixed frequency, inverting mode switching reglator that operates from an input voltage as low as 1V. Utilizing a low noise topology, the LT1614 can generate a negative output down to 24V from a 1V to 5V input. Fixed frequency switching ensures a clean output free from low frequency noise. The device contains a lowbattery detector with a 200mV reference and shuts down to less than 10µA. No load quiescent current of the LT1614 is 1mA and the internal NPN power switch handles a 500mA current with a voltage drop of just 295mV.

High frequency switching enables the use of small inductors and capacitors. Ceramic capacitors can be used in many applications, eliminating the need for bulky tantalum types.

The LT1614 is available in 8-lead MSOP or SO packages.