Part Number
UM1350
Description
30V, 0.35A LED Driver with Internal Switch
Status
ACTIVE
Topology
Buck, Current mode
Dimming Mode
Analog, PWM
Vin(Min) (V)
6
Vin(Max) (V)
30
Iout(Max) (A)
0.4
Iq(typ) (mA)
0.22
Max Efficiency(%)
95
Channnels
1
Features
Enable/Shutdown, Soft-start, Thermal Shutdown, Open Circuit LED Protection
Operating Temperature Range (℃)
-40 to 85
Package
SOT23-5
The UM1350 is capable of driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. This step-down converter provides an externally adjustable output current of up to 350mA from an input supply between 6V and 30V. It can even reach 8 watts of output power, depending on supply voltage and external components. The UM1350 consists of an output switch and a high-side output current sensing circuit that uses an external resistor to set the nominal average output current. Through applying an external control signal to the VSET pin, it can adjust the output current below the set value. The VSET pin will accept either a DC voltage or a PWM waveform to provide a continuous or a gated output current. The chip contains a PWM filter which provides a soft-start feature by controlling the rise of input/output current. It can raise the soft-start by using an external capacitor from the VSET pin to ground. Applying a voltage of 0.2V or lower to the VSET pin turns the output off and switches the device into a low current standby state.
The UM1350 is available in a low profile SOT23-5 package.
- Built in Thermal and Over-Current Shutdown
- Internal 40V NDMOS Switch
- 350mA Output Current
- Single Pin On/Off and Dimming Control Using DC Voltage or PWM at VSET Pin
- Internal PWM Filter
- Soft-Start
- High Efficiency (Up to 95%)
- Wide Input Voltage Range: 6V to 30V
- 40V Transient Capability
- Output Shutdown
- Up to 1MHz Switching Frequency
- Inherent Open-Circuit LED Protection
- Typical 5% Output Current Accuracy
- MR16 and General Lighting
- Automotive Lighting
- Low Voltage Industrial Lighting
- LED Back Lighting
- Illuminated Signs
Part Number | Packaging Type | Marking Code | Shipping Qty |
---|---|---|---|
UM1350 | SOT23-5 | 5AS | 3000pcs/7Inch Tape & Reel |