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LTC1159

Features: Operation from 4V to 40V Input VoltageUltrahigh Efficiency: Up to 95%20mA Supply Current in ShutdownHigh Efficiency Maintained Over Wide Current RangeCurrent Mode Operation for Excellent Line and Load Transient ResponseVery Low Dropout Operation: 100% Duty CycleShort-Circuit ProtectionSy...

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LTC1159: Features: Operation from 4V to 40V Input VoltageUltrahigh Efficiency: Up to 95%20mA Supply Current in ShutdownHigh Efficiency Maintained Over Wide Current RangeCurrent Mode Operation for Excellent L...

LTC1159 Data Sheet

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Part Number:
LTC1159
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

 Operation from 4V to 40V Input Voltage
 Ultrahigh Efficiency: Up to 95%
 20mA Supply Current in Shutdown
 High Efficiency Maintained Over Wide Current Range
 Current Mode Operation for Excellent Line and Load Transient Response
 Very Low Dropout Operation: 100% Duty Cycle
 Short-Circuit Protection
 Synchronous FET Switching for High Efficiency
 Adaptive Non-Overlap Gate Drives
 Available in SSOP and SO Packages


Application

 Step-Down and Inverting Regulators
 Notebook and Palmtop Computers
 Portable Instruments
 Battery-Operated Digital Devices
 Industrial Power Distribution
 Avionics Systems
 Telecom Power Supplies


Pinout

Connection Diagram


Specifications

Input Supply Voltage (Pin 2) ...................... 15V to 60V
VCC Output Current (Pin 3) ................................... 50mA
Continuous Pin Currents (Any Pin) ........................ 50mA
Sense Voltages ......................................... 0.3V to 13V
Shutdown Voltages.................................................... 7V
EXTVCC Input Voltage .............................................. 15V
Junction Temperature (Note 2) ............................ 125°C
Operating Temperature Range
    LTC1159C ............................................... 0°C to 70°C
    LTC1159I............................................. 40°C to 85°C
Extended Commercial
Temperature Range ................................. 40°C to 85°C
Storage Temperature Range ................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C


Description

The LTC®1159 series is a family of synchronous step-down switching regulator controllers featuring automatic Burst ModeTM operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture.

A separate pin and on-board switch of LTC1159 series allow the MOSFET driver power to be derived from the regulated output voltage providing significant efficiency improvement when operating at high input voltages. The constant off-time current-mode architecture maintains constant ripple current in the inductor and provides excellent line and load transient response. The output current level is user programmable via an external current sense resistor.

The LTC1159 automatically switches to power saving Burst Mode operation when load current drops below approximately 15% of maximum current. Standby current is only 300mA while still regulating the output and shutdown current is a low 20mA.




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