DocumentationDatasheet
Reliability Data
LT Journal
Press Release
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Features
- True Color PWM™ Dimming Delivers Up to 3000:1 Dimming Ratio
- Built-In Gate Driver for PMOS LED Disconnect
- Three Independent Driver Channels with 600mA, 60V Internal Switches
- Operates in Buck, Boost, Buck-Boost Modes
- CTRL Pin Accurately Sets LED Current Sense
- Threshold Over a Range of 10mV to 100mV
- Adjustable Frequency: 330kHz to 2.1MHz
- Open LED Protection
- Wide Input Voltage Range:
Operation from 3V to 30V
Transient Protection to 40V - Surface Mount Components
- 28-Lead (4mm × 5mm) QFN and TSSOP Packages
Typical Application
Description
The LT3492 is a triple output DC/DC converter designed to operate as a constant-current source and is ideal for driving LEDs. The LT3492 works in buck, boost or buck-boost mode. The LT3492 uses a fixed frequency, current mode architecture resulting in stable operation over a wide range of supply and output voltages. A frequency adjust pin allows the user to program switching frequency between 330kHz and 2.1MHz to optimize efficiency and external component size.
The external PWM input provides 3000:1 LED dimming on each channel. Each of the three channels has a built-in gate driver to drive an external LED-disconnect P-channel MOSFET, allowing high dimming range. The output current range of each channel of the LT3492 is programmed with an external sense resistor.
The CTRL pin is used to adjust the LED current either for analog dimming or over-temperature protection.
4x5 QFN-28,TSSOP-28
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT3492EFE#PBF | TSSOP | 28 | E | $5.50 | $3.85 |
| LT3492EFE#TRPBF | TSSOP | 28 | E | $3.91 | |
| LT3492EUFD#PBF | QFN | 28 | E | $5.29 | $3.70 |
| LT3492EUFD#TRPBF | QFN | 28 | E | $3.76 | |
| LT3492IFE#PBF | TSSOP | 28 | I | $6.47 | $4.53 |
| LT3492IFE#TRPBF | TSSOP | 28 | I | $4.59 | |
| LT3492IUFD#PBF | QFN | 28 | I | $6.22 | $4.35 |
| LT3492IUFD#TRPBF | QFN | 28 | I | $4.41 |
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 |
|---|---|---|---|
| DC1405A | LT3492EFE Demo Board | Boost/ Buck-Boost Triple Output LED Driver, 8V ≤ VIN ≤ 40V, VLED = 54V @ 61mA (x3) | $125.00 |