LT1371

Features:

Faster Switching with Increased Efficiency
 Uses Small Inductors: 4.7µH
 All Surface Mount Components
 Low Minimum Supply Voltage: 2.7V
 Quiescent Current: 4mA Typ
 Current Limited Power Switch: 3A
 Regulates Positive or Negative Outputs
 Shutdown Supply Current: 12µA Typ
 Easy External Synchronization


Application

 Boost Regulators
Laptop Computer Supplies
 Multiple Output Flyback Supplies
 Inverting Supplies


Pinout




Specifications

Supply Voltage .......................................................     30V
Switch Voltage
    LT1371 ...............................................................     35V
    LT1371HV ..........................................................      42V
S/S, ,SHDN, SYNC Pin Voltage ................................       30V
Feedback Pin Voltage (Transient, 10ms) ..............     ±10V
Feedback Pin Current ...........................................     10mA
Negative Feedback Pin Voltage
    (Transient, 10ms) .............................................     ±10V
Operating Ambient Temperature Range ......  0°C to 70°C
Operating Junction Temperature Range
Commercial ..........................................       0°C to 125°C
Industrial .........................................      40°C to 125°C
Short Circuit .........................................       0°C to 150°C
Storage Temperature Range ................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................  300°C


Description

The LT^® 1371 is a monolithic high frequency current mode switching regulator. It can be operated in all standard switching configurations including boost, buck, flyback, forward, inverting and "Cuk." A 3A high efficiency switch is included on the die, along with all oscillator, control and protection circuitry.

The LT1371 typically consumes only 4mA quiescent current and has higher efficiency than previous parts. High frequency switching allows for very small inductors to be used.

New design techniques of LT1371 increase flexibility and maintain ease of use. Switching is easily synchronized to an external logic level source. A logic low on the Shutdown pin reduces supply current to 12µA. Unique error amplifier circuitry can regulate positive or negative output voltage while maintaining simple frequency compensation techniques. Nonlinear error amplifier transconductance reduces output overshoot on start-up or overload recovery.
Oscillator frequency shifting protects external components during overload conditions.