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Overview

The WD3170 is a constant current, high efficiency LED driver. Internal MOSFET can drive up to 10 white LEDs in series with 1.8A current limit and 45V Power HV-NMOS. A Pulse-Width-Modulation (PWM) signal can be applied to the EN pin for LED dimming. The device operates at 900 KHz fixed switching frequency to reduce output ripple, improve conversion efficiency, and allows using small external components.

When pull up the ENF pin, WD3170 enters into flash mode. In flash mode, WD3170 can burst LED current to 3 times of the full scale setting backlight current. Meanwhile, the WD3170 receives PWM signal at ENF pin for flash dimming. To protect white LED, the WD3170 automatically exits flash mode if it lasts for more than 1s, and the WD3170 will not operate in flash mode until ENF is re-cycled from low to high.

The WD3170 is available in TSOT-23-6L Package. Standard product is Pb-free and Halogen-free.

Applications
- Smart Phones
- Tablets
- Portable games

Features

Input voltage range:
2.7~5.5V

Open LED Protection:
LX>38V&& FB < 50 mV

Reference Voltage:
200 mV (BacklightMode)
600 mV (FlashMode)

Switching freq:
900 KHz (Typ.)

Efficiency:
Up to 92%

Current limit:
1.8A (Typ.)

PWM Dimming freq:
20 KHz to 100 KHz

PWM Dimming Duty:
0.3% ~ 100%

Flash Time-Out:
1.0s

Order Information
Ordering No. Vout(V) Package
WD3170F-6/TR N/A TSOT-23-6L
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