DocumentationDatasheet
Design Note
Reliability Data
LT Journal
cad_symbol
Features
- Operates from Single Li-Ion Battery
- 2.8V to 5.5V Input Voltage Range
- Very Low Shutdown Current: <2µA
- Synchronous Buck Architecture for High Efficiency
- PWM Dimming Frequency Adjustable with a Single Capacitor
- Accurate Lamp Current Maximizes Lamp Lifetime
- Fixed Frequency Operation at 300kHz
- Internal or External PWM Dimming
- Small 10-Pin MSOP Package
Typical Application
Description
The LTC1697 is designed to control a single 1W cold cathode fluorescent lamp (CCFL). An internal PWM dimming system maximizes efficiency and dimming range. Accurate lamp currents can be set with a single external resistor.
The LTC1697 includes a synchronous current mode PWM controller with internal 1A MOSFET switches. It contains a 300kHz oscillator, 0.8V reference, and internal current sense. It operates from a 2.8V to 5.5V input voltage. The LTC1697 also has a thermal limit and a shutdown that reduces supply current to <2µA.
The LTC1697 is available in the MSOP-10 package.
MS-10
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC1697EMS#PBF | MSOP | 10 | E | $2.79 | $1.95 |
| LTC1697EMS#TRPBF | MSOP | 10 | E | $2.00 | |
| LTC1697EMS | MSOP | 10 | E | $5.58 | $3.90 |
| LTC1697EMS#TR | MSOP | 10 | E | $4.00 |
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.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC510A | LTC1697EMS | 1 Watt CCFL Controller, Vin = 2.7V - 5.5V, VDim = 1V(0%) - 2V(100%) | $150.00 |