TPS62700 Datasheet, PDF (1/25 Pages) Texas Instruments – 2 MHz 650 mA Step Down Converter for RF Power Amplifiers in Tiny 8-pin WCSP Package

TPS62700
www.ti.com
SLVS784A – DECEMBER 2007 – REVISED MARCH 2008
2 MHz 650 mA Step Down Converter for RF Power Amplifiers in
Tiny 8-pin WCSP Package
FEATURES
1
• High-Efficiency Step-Down Converter
• Output Current up to 650 mA
• V_IN Range From 2.5 to 6.0 V
• 2.0-MHz Fixed-Frequency Operation
• 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 µs)
• Soft Start
• Overload Protection
• Undervoltage Lockout
• Thermal Protection
• 8-Pin WCSP Package
APPLICATIONS
• Cell Phones, Smart Phones
• Battery-Powered RF Amplifier
DESCRIPTION
The TPS62700 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 TPS62700 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 TPS62700 is available in a tiny 8 pin lead free
WCSP package for smallest solution size.
TYPICAL APPLICATION
V_IN 2.5 V to 6.0 V
10 mF
AVIN
PVIN
SW
3.3 mH
V_OUT = 2.5 x VCON
1.3 V to 3.09 V
FB
EN
4.7 mF
VCON
AGND
PGND
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007–2008, Texas Instruments Incorporated