Home > Products > Power Supply > Switching Regulators > LED Backlight Boost Driver
Datasheet Reliability Report Package Information Order Sample  
Key Specifications
Part Number Description Status Channels(.) Vin (Min)(V) Vin (Max)(V) Vout (Min)(V) Vout (Max)(V) Isw (Peak)(A) Switching Frequency(Max)(kHz) Type LED Current Per Channel(mA) LED(.) Topology Duty Cycle(Max)(%) Shutdown Current(Max)(μA) Peak Efficiency(%) Operating Temperature Range(°C) Pin/Package EV Kit Available?
UM1663S PWM Mode Step-up DC-DC Converter with 38V/1.0A MOSFET ACTIVE 1 2.8 5.5 36 1 1000 Inductive 30 10 Boost 93 1 90 -40 to 85 6/SOT23
View All>>
Product Description
The UM1663S is a highly integrated LED driver IC capable of driving 10 WLEDs in series. It is composed of a current mode boost converter integrated with a 38V/1A power switch.
The UM1663S supports a wide input voltage range from 2.8Vto 5.5V and runs at a fixed frequency of 1MHz. The LED current is set via an external resistor and the feedback voltage is regulated to 200mV. During operation, the LED current is controlled by the duty cycle of the SHDN input signal, which determines the feedback reference voltage.
The UM1663S can modify dimming to support 64-step pulse dimming. More details are shown in the Timing Diagram section.
The UM1663S also has internal overvoltage protection setting to prevent the output from exceeding the absolute maximum ratings during open LED conditions. It is available inGreenSOT23-6 package and operates over an ambient temperature range of -40°C to +85°C.
High Output Voltage: Up to 36V
- Internal Soft-Start and Compensation
- 200mV Reference Voltage
- PWM Dimming and Frequency Range from 500Hzto 50kHz
- 64-Step Pulse Dimming
- Open LED Protection
- Internal Over Voltage Protection Setting
- Over Temperature Protection
- Current Limit Protection
- RoHS Compliant and Halogen Free
Typical Application Circuit

- Mobile Phone and Smart Phone
- Digital Camera and GPS
- Portable DVD Player
Pin Configurations   


Ordering Information

Part Number
Packaging Type
Marking Code
Shipping Qty
Tape & Reel
@2014 Union Semiconductor Limited. All rights Reserved. 沪ICP备09013408