DocumentationDatasheet
Application Note
- AN55 - Techniques for 92% Efficient LCD Illumination
- AN61 - Practical Circuitry for Measurement and Control Problems
- AN65 - A Fourth Generation of LCD Backlight Technology
Design Note
Reliability Data
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Features
- Operates at Supply Voltages from 2V to 30V
- Consumes Only 320µA Supply Current
- Works in Step-Up or Step-Down Mode
- Only Three 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 SO-8 Package
Typical Application
Description
The LT1107 is a versatile micropower DC/DC converter. The device requires only three 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 LT1107 functions equally well in step-up,step-down, or inverting applications.
The LT1107 is pin-for-pin compatible with the LT1111, but has a duty cycle of 70%, resulting in increased output current in many applications. The LT1107 can deliver 150mA at 5V from a 2AA cell input and 5V at 300mA from 24V in step-down mode. Quiescent current is just 320µA, making the LT1107 ideal for power-conscious battery operated systems. The 63kHz oscillator is optimized to work with surface mount inductors and capacitors.
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 lock-out circuit, or error amplifier.
N-8,SO-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT1107CN8#PBF | PDIP | 8 | C | $3.00 | $2.45 |
| LT1107CN8-12#PBF | PDIP | 8 | C | $3.00 | $2.45 |
| LT1107CN8-5#PBF | PDIP | 8 | C | $3.00 | $2.45 |
| LT1107CS8#PBF | SO | 8 | C | $2.80 | $2.25 |
| LT1107CS8#TRPBF | SO | 8 | C | $2.31 | |
| LT1107CS8-12#PBF | SO | 8 | C | $3.42 | $2.75 |
| LT1107CS8-5#PBF | SO | 8 | C | $3.42 | $2.75 |
| LT1107CS8-5#TRPBF | SO | 8 | C | $2.81 | |
| LT1107IS8#PBF | SO | 8 | I | $3.60 | $2.95 |
| LT1107IS8#TRPBF | SO | 8 | I | $3.01 | |
| LT1107CN8 | PDIP | 8 | C | $6.00 | $4.90 |
| LT1107CN8-12 | PDIP | 8 | C | $6.00 | $4.90 |
| LT1107CN8-5 | PDIP | 8 | C | $6.00 | $4.90 |
| LT1107CS8 | SO | 8 | C | $5.60 | $4.50 |
| LT1107CS8#TR | SO | 8 | C | $4.62 | |
| LT1107CS8-12 | SO | 8 | C | $6.84 | $5.50 |
| LT1107CS8-5 | SO | 8 | C | $6.84 | $5.50 |
| LT1107CS8-5#TR | SO | 8 | C | $5.62 | |
| LT1107IS8 | SO | 8 | I | $7.20 | $5.90 |
| LT1107IS8#TR | SO | 8 | I | $6.02 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.