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1FEATURES

· High-Efficiency Step-Down Converter

· Output Current up to 650 mA

· VIN Range From 2.5 to 6.0 V

· 2.0-MHz Fixed-Frequency Operation

· Clock Dithering (TPS62701)

· Dynamic Voltage Control With External

Reference (1.3 V to 3.09 V)

· Fast Output-Voltage Settling (1.3 V to 3.09 V in

20 ms)

· Soft Start

· Overload Protection

· Undervoltage Lockout

· Thermal Protection

· 8-Pin WCSP Package

APPLICATIONS

· Cell Phones, Smart Phones

· Battery-Powered RF Amplifier

DESCRIPTION

The TPS6270x device is a high-efficiency

synchronous step-down DC-DC converter optimized

for RF power-amplifier (PA) applications. It provides up to 650 mA of output current from a single Li-Ion

cell.

The device converts input voltages from 2.5 to 6.0 V

down to an output voltage set by an external analog

reference voltage applied to the pin VCON. The

output voltage follows the external reference by an

internal gain of 2.5 within the limits of 1.3 V to 3.09 V. This scheme adjusts the output voltage of the DC/DC

converter and therefore the output power of an

RF-PA.

The TPS6270x operates in fixed-frequency PWM

mode at a 2.0-MHz switching frequency to minimize

RF interference. This converter operates with only

three small external components; an input capacitor,

inductor and output capacitor. The TPS62701 has in addition a built-in clock-dithering circuit to reduce RF

noise.

The TPS6270x is available in a tiny 8 pin lead free

WCSP package for smallest solution size.