LT1956EFE

Series: -
Output Type: Adjustable
Number of Outputs: 1
Current - Output: 1.5A
Synchronous Rectifier: No
Mounting Type: Surface Mount
Frequency - Switching: 500kHz
Operating Temperature: -40°C ~ 125°C
Packaging: Tube
Type: Step-Down (Buck)
PWM Type: Current Mode
Package / Case: 16-TSSOP (0.173", 4.40mm Width) Exposed pad
Manufacturer: Linear Technology
Supplier Device Package: 16-TSSOP-EP
Voltage - Input: 5.5 V ~ 60 V
Voltage - Output: 1.2 V ~ 45 V


Features:

Wide Input Range: 5.5V to 60V
1.5A Peak Switch Current
Small 16-Pin SSOP or Thermally Enhanced TSSOP Package
Saturating Switch Design: 0.2Ω
Peak Switch Current Maintained Over Full Duty Cycle Range
Constant 500kHz Switching Frequency
Effective Supply Current: 2.5mA
Shutdown Current: 25µA
1.2V Feedback Reference (LT1956)
5V Fixed Output (LT1956-5)
Easily Synchronizable
Cycle-by-Cycle Current Limiting


Application

High Voltage, Industrial and Automotive
Portable Computers
Battery-Powered Systems
Battery Chargers
Distributed Power Systems


Pinout




Specifications

Input Voltage (V_IN) ................................................  60V
BOOST Pin Above SW .............................................  35V
BOOST Pin Voltage ................................................  68V
SYNC, SENSE Voltage (LT1956-5) ............................  7V
SHDN Voltage ..........................................................  6V
BIAS Pin Voltage ....................................................  30V
FB Pin Voltage/Current (LT1956) ..................  3.5V/2mA
Operating Junction Temperature Range
  LT1956EFE/LT1956EFE-5/LT1956EGN/LT1956EGN-5
  (Notes 8, 10) ..................................... 40°C to 125°C
  LT1956IFE/LT1956IFE-5/LT1956IGN/LT1956IGN-5
  (Notes 8, 10) ..................................... 40°C to 125°C
Storage Temperature Range .............  65°C to 150°C
Lead Temperature (Soldering, 10 sec) ...............  300°C


Description

The LT^® 1956/LT1956-5 are 500kHz monolithic buck switching regulators with an input voltage capability up to 60V. A high efficiency 1.5A, 0.2Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and good loop stability.

Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range*. A shutdown pin reduces supply current to 25µA and the device can be externally synchronized from 580kHz to 700kHz with a logic level input.

The LT1956/LT1956-5 are available in fused-lead 16-pin SSOP and thermally enhanced TSSOP packages.

Parameters:

Technical/Catalog Information	LT1956EFE
Vendor	Linear Technology
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	5.5 ~ 60 V
Voltage - Output	-
Current - Output	1.5A
Power - Output	-
Package / Case	16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
Packaging	Tube
Internal Switch(s)	Yes
Synchronous	Yes
Rds (On)	-
Operating Temperature	-40°C ~ 125°C
Frequency - Switching	500kHz
Drawing Number	161; 05-08-1663 var BB; FE; 16
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	LT1956EFE LT1956EFE