|
Key Specifications
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.
Features
- 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 FreeTypical Application Circuit
.jpg) Applications
- Mobile Phone and Smart Phone
- Digital Camera and GPS
- Portable DVD PlayerPin Configurations
 UM1663S Ordering Information
|
Application Notes
Product Selection Guide
Product Search
Product You Recently Viewed
|
