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LT1108

Features: · Operates at Supply Voltages from 2V to 30V· Consumes Only 110mA Supply Current· Works in Step-Up or Step-Down Mode· Only Four External Components Required· Low Battery Detector Comparator On-Chip· User Adjustable Current Limit· Internal 1A Power Switch· Fixed or Adjustable Output Volta...

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SeekIC No. : 004400333 Detail

LT1108: Features: · Operates at Supply Voltages from 2V to 30V· Consumes Only 110mA Supply Current· Works in Step-Up or Step-Down Mode· Only Four External Components Required· Low Battery Detector Comparato...

LT1108 Data Sheet

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Part Number:
LT1108
Supply Ability:
5000

Price Break

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

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Upload time: 2024/10/17

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Product Details

Description



Features:

· Operates at Supply Voltages from 2V to 30V
· Consumes Only 110mA Supply Current
· Works in Step-Up or Step-Down Mode
· Only Four External Components Required
· Low Battery Detector Comparator On-Chip
· User Adjustable Current Limit
· Internal 1A Power Switch
· Fixed or Adjustable Output Voltage Versions
· Space Saving 8-Pin MiniDIP or S8 Package


Application

· Palmtop Computers
· 3V to 5V, 5V to 12V Converters
· 9V to 5V, 12V to 5V Converters
· LCD Bias Generators
· Peripherals and Add-On Cards
· Battery Backup Supplies
· Cellular Telephones
· Portable Instruments


Pinout

Connection Diagram


Specifications

Supply Voltage (VIN) ............................................... 36V
SW1 Pin Voltage (VSW1) ......................................... 50V
SW2 Pin Voltage (VSW2) .......................... 0.5V to VIN
Feedback Pin Voltage (LT1108) ............................. 5.5V
Sense Pin Voltage (LT1108, -5, -12) ...................... 36V
Maximum Power Dissipation ............................ 500mW
Maximum Switch Current ...................................... 1.5A
Operating Temperature Range .................... 0 to 70
Storage Temperature Range ................ 65 to 150
Lead Temperature (Soldering, 10 sec)................. 300


Description

The LT1108 is a versatile micropower DC/DC converter. The device requires only four external components to deliver a fixed output of 5V or 12V. Supply voltage ranges from 2V to 12V in step-up mode and to 30V in step-down mode. The LT1108 functions equally well in step-up, stepdown, or inverting applications.

The LT1108 is pin-for-pin compatible with the LT1173, but has a duty cycle of 70%, resulting in increased output current in many applications. The device can deliver 150mA at 5V from a 2 AA cell input and 5V at 300mA from 9V in step-down mode. Quiescent current is just 110mA, making the LT1108 ideal for power conscious batteryoperated systems.

Switch current limit can be programmed with a single resistor. An auxiliary gain block can be configured as a low battery detector, linear post regulator, undervoltage lockout circuit, or error amplifier.




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