TPS62270_08 Datasheet, PDF (1/23 Pages) Texas Instruments – 2.25 MHz 400-mA Step Down Converter With Selectable VOUT

TPS62270
TPS62273
www.ti.com................................................................................................................................................... SLVS799B – NOVEMBER 2007 – REVISED JUNE 2008
2.25 MHz 400-mA Step Down Converter With Selectable VOUT
FEATURES
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• High Efficiency Step Down Converter
• Output Current up to 400 mA
• V_IN Range From 2V to 6V for Li-Ion Batteries
With Extended Voltage Range
• 2.25 MHz Fixed Frequency Operation
• Pin-Selectable Fixed Output Voltage
• Power Save Mode for Highest Efficiency
• Automatic transition between PFM and PWM
Mode
• Voltage Positioning in PFM Mode
• Typical 15-µA Quiescent Current
• 100% Duty Cycle for Lowest Dropout
• Available in 2×2×0,8 mm SON Package
• Allows <1 mm Solution Height
APPLICATIONS
• Low Power Processor Supply
• Cell Phones, Smart-phones
• Navigation Systems
• Low Power DSP Supply
• Portable Media Players
• Digital Cameras
DESCRIPTION
The TPS62270 device is a high efficiency
synchronous step down DC-DC converter optimized
for battery powered portable applications. It provides
up to 400 mA output current from a single Li-Ion cell.
With an input voltage range of 2.0 V to 6 V the device
supports Li-Ion batteries with extended voltage range,
and is ideal to power portable applications like mobile
phones and other portable equipment.
The TPS62270 operates at 2.25 MHz fixed switching
frequency and enters Power Save Mode operation at
light load currents to maintain high efficiency over the
entire load current range. The Power Save Mode is
optimized for low output voltage ripple.
With the VSEL pin, two different fixed output voltages
can be selected. This function features a dynamic
voltage scaling for low power processor cores.
In the shutdown mode, the current consumption is
reduced to less than 1µA. TPS62270 allows the use
of small inductors and capacitors to achieve a small
solution size.
The TPS62270 is available in a 2 mm × 2 mm, 6-pin
SON package.
V_IN = 2 V to 6 V
TPS62270DRV
VIN
SW
C_IN
4.7 mF
EN
FB
GND
0.9 V
1.15 V
VSEL
L
2.2 mH
V_OUT
0.9 V / 1.15 V
up to 400 mA
C_OUT
10 mF
C_OUT
V _{C IN}
IN
U₁
V_OUT
L₁
GND
6.5 mm
Total area
21.5 mm²
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of 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