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Key Specifications
Part Number Description Status SubFamily Regulated Outputs(.) Vin(Min)(V) Vin(Max)(V) Vout(Min)(V) Vout(Max)(V) Iout(Max)(A) Topology Special Features Frequency(kHz) Operating Temperature Range (°C) Pin/Package EV Kit Available?
UM3500 600mA, 1.5MHz, Synchronous Step-Down DC-DC Converter ACTIVE Step-Down (Buck) Converter 1 2.5 5.5 0.6 5.5 0.6 Synchronous Buck Enable 1500 -40 to 85 5/SOT23 Y
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Product Description
The UM3500 is a 1.5MHz constant frequency, slope compensated current mode PWM step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. It is ideal for powering portable equipment that runs from a single cell lithium-Ion (Li+) battery. The UM3500 can supply 600mA of load current from a 2.5V to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The UM3500 can also run at 100% duty cycle for low dropout operation, extending battery life in portable system. Pulse Skipping Mode operation at light loads provides very low output ripple voltage for noise sensitive applications.
The UM3500 is available in a low profile SOT23-5 package.
- High Efficiency: Up to 96%
- 1.5MHz Constant Switching Frequency
- 600mA Output Current
- Integrated Main Switch and Synchronous Rectifier. No External Schottky Diode.
- 2.5V to 5.5V Input Voltage Range
- Output Voltage as Low as 0.6V
- 100% Duty Cycle in Dropout
- Low Quiescent Current: 50µA
- Short Circuit Protection
- Thermal Fault Protection
- <1µA Shutdown Current
- Lead-Free SOT23-5 Package
Typical Application Circuit

- Cellular and Smart Phones
- Microprocessors and DSP Core Supplies
- Wireless and DSL Modems
- MP3 Player
- Portable Instruments
Pin Configurations  

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