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.