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LTC1143L

Features: Dual OutputsLTC1143, LTC1143L: 3.3V, 5VLTC1143L-ADJ: Dual Adjustable Very High Efficiency: Over 95% Possible Current Mode Operation for Excellent Line and LoadTransient Response High Efficiency Maintained over Three Decades ofOutput Current Low Standby Current at Light Loads: 160µ...

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SeekIC No. : 004401387 Detail

LTC1143L: Features: Dual OutputsLTC1143, LTC1143L: 3.3V, 5VLTC1143L-ADJ: Dual Adjustable Very High Efficiency: Over 95% Possible Current Mode Operation for Excellent Line and LoadTransient Response High Effi...

LTC1143L Data Sheet

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Part Number:
LTC1143L
Supply Ability:
5000

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Product Details

Description



Features:

Dual OutputsLTC1143, LTC1143L: 3.3V, 5VLTC1143L-ADJ: Dual Adjustable
Very High Efficiency: Over 95% Possible
Current Mode Operation for Excellent Line and LoadTransient Response
  High Efficiency Maintained over Three Decades ofOutput Current
Low Standby Current at Light Loads: 160µA/Output
Logic-Controlled Shutdown (LTC1143, LTC1143L)
Wide VIN Range: 3.5V to 16V(LTC1143L, LTC1143L-ADJ)
Very Low Dropout Operation: 100% Duty Cycle
Available in Narrow 16-Pin SO Package


Application

Personal Digital Assistants
Notebook and Palmtop Computers
Battery-Operated Digital Devices
Portable Instruments
DC Power Distribution Systems


Pinout

Connection Diagram




Specifications

Input Supply Voltage (Pins 5,13) ............... 16V to 0.3V
Continuous Output Current (Pins 4,12) ................ 50mA
Sense Voltages (Pins 1, 8, 9, 16).
VIN 12.7V ............................................  13V to 0.3V
VIN < 12.7V ................................ (VIN + 0.3V) to 0.3V
Shutdown Voltage
(LTC1143, LTC1143L, Pins 2, 10) ...............7V to 0.3V
VFB Current (LTC1143L-ADJ, Pins 2, 10) ................. 1mA
Operating Temperature Range.
Ambient .................................................... 0°C to 70°C
Extended Commercial (Note 4) .............40°C to 85°C
Junction Temperature (Note 1) ............................ 125°C
Storage Temperature Range .............. 65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................. 300°C


Description

The LTC1143 series is a dual step-down switching regulatorcontroller featuring automatic Burst ModeTMoperation tomaintain high efficiencies at low output currents. Thisdevice is composed of two separate regulator blocks,each driving an external power MOSFET at switchingfrequencies up to 400kHz using a constant off-time currentmode architecture. Both fixed and adjustable voltages areavailable.

The operating current level for both regulators is user-programmable via an external current sense resistor.Wide input supply range allows operation from 4V to 14V(16V maximum). The LTC1143L and LTC1143L-ADJextend operation to VIN = 3.5V. 100% duty cycle provideslow dropout regulation limited only by the RDS(ON) of theexternal MOSFET and resistance of the inductor andcurrent sense resistor.

The LTC1143 series is ideal for applications requiring dualoutput voltages with high conversion efficiencies over awide load current range in a small amount of board space.




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