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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?
UM3430ADA 1A,1MHz,同步升压型DC-DC转换器 ACTIVE Step-Up (Boost) Converter 1 1.2 5.4 2.5 5.5 1 Synchronous Boost Enable, Pulse Skipping Mode, Anti-Ringing Control 1000 -40 to 85 6/DFN 2.0×2.0 Y
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Product Description
The UM3430A is a synchronous rectified, fixed frequency, step-up DC/DC converter delivering high efficiency in low profile SOT23-6 and DFN6 2.0×2.0 packages. The device features true output load disconnection and adjustable output with a current limit of 1A. With an internal NMOS switch, PMOS synchronous rectifier and high switching frequency of 1MHz, the UM3430A is capable of supplying 5.0V output at 500mA from single Li-ion cell or 300mA from 2 cell AA input using low profile inductors and ceramic capacitors. Current mode PWM control with internal compensation as well as the synchronous rectifier and 1MHz high frequency lead to the fewest number of external parts needed thereby saving BOM cost and PCB area. At light load, UM3430A enters automatically into pulse skipping mode to keep high efficiency. An internal dumping circuit will be connected to VIN when the switch is idle that eliminates switch ringing and reduces EMI interference. Minimum VIN operation after start-up is only limited by the battery’s ability to provide the necessary power as it enters a deeply discharge state.
The device also features low shutdown current less than 1μA. It also limits the inductor current below to 500mA during start-up, minimizing surge currents seen by the input supply.
- 5V at 500mA from single Li-Ion Cell
- Up to 94% Efficiency
- Output Load Disconnection
Internal Synchronous Rectifier
Input Current Limit 1A
Pulse Skipping Mode Operation with Typical IQ as 48μA
Shutdown Current Lower than 1µA
1MHz Switching Frequency for Low Profile Inductor/Capacitor
Minimum Start-Up Voltage: 2.3V
- Output Voltage: 2.5V to 5.5V
- Anti-Ringing Control to Reduce EMI 
Typical Application Circuit



Compact Solution for 5V USB On-The-Go VBUS Power
Digital Cameras
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Wireless Handsets
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Pin Configurations  

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Ordering Information

Part Number
Packaging Type
Marking Code
Shipping Qty
DFN6 2.0×2.0
Tape & Reel
Application Notes
Analog Switch Permits Port Sharing in Portable Equipment.pdf
Balanced Modulator Demodulator Employing UM4684.pdf
Level Shifter for High Speed and Wide Voltage Range Interface.pdf
Low Resistance Analog Switches Permit Speaker Switching in Audio Devices.pdf
Low-Icct Analog Switches for Ultra-Portable Designs.pdf
Selecting the Right CMOS Analog Switch.pdf 未填写
Product Selection Guide
Power Supply Selection Guide.pdf
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