TX9406B General Description:
The TX9406B is a high-efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture.
The device is available in an adjustable version. Supply current with no load is 40uA and drops to <1uA in shutdown. The 2.5V to 5.5V input voltage range makes the TX9406B ideally suited for single Li-Ion battery powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.
PWM/PFM mode operation provides very low output ripple voltage for noise sensitive applications. Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. Low output voltages are easily supported with the 0.6V feedback reference voltage.
The TX9406B requires a minimal number of readily available, external components and is available in a space saving SOT23-5 package.
TX9406B Features:
2.5V to 5.5V Input Voltage Range
High Efficiency: Up to 96%
Output Adjustable from 0.6V
No Schottky Diode Required
Over Temperature Protected
Low Quiescent Current: 40μA
Available in SOT23-5 package
-40°C to +85°C Temperature Range
1.5A Continuous Output Current
1.5MHz Switching Frequency
Built-in Short Protection
Built-in Over Current Limit
Built-in Over Voltage Protection
PFM Mode for High Efficiency in Light Load
Internal Soft-Start
TX9406B Applications:
Cellular and Smart Phones
Wireless and DSL Modems
PDAs
Portable Instruments
Digital Still and Video Cameras
PC Cards
TX9406B Typical Application:
TX9406B Functional Block Diagram:
TX9406B Package Information:
TX9406B Pin Description
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