TPS63030_09 Datasheet, PDF (1/23 Pages) Texas Instruments – HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 1-A SWITCHES

TPS63030
TPS63031
www.ti.com.................................................................................................................................................. SLVS696A – OCTOBER 2008 – REVISED MARCH 2009
HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 1-A SWITCHES
FEATURES
1
•2 Up to 96% Efficiency
• 800-mA Output Current at 3.3V in Step Down
Mode (VIN = 3.6V to 5.5V)
• Up to 500-mA Output Current at 3.3V in Boost
Mode (VIN > 2.4V)
• Automatic Transition Between Step Down and
Boost Mode
• Device Quiescent Current less than 50µA
• Input Voltage Range: 1.8V to 5.5V
• Fixed and Adjustable Output Voltage Options
from 1.2V to 5.5V
• Power Save Mode for Improved Efficiency at
Low Output Power
• Forced Fixed Frequency Operation and
Synchronization Possible
• Load Disconnect During Shutdown
• Over-Temperature Protection
• Available in Small 2,5-mm × 2,5-mm, QFN-10
Package
APPLICATIONS
• All Two-Cell and Three-Cell Alkaline, NiCd or
NiMH or Single-Cell Li Battery Powered
Products
• Portable Audio Players
• PDAs
• Cellular Phones
• Personal Medical Products
• White LEDs
DESCRIPTION
The TPS6303x devices provide a power supply
solution for products powered by either a two-cell or
three-cell alkaline, NiCd or NiMH battery, or a
one-cell Li-Ion or Li-polymer battery. Output currents
can go as high as 600 mA while using a single-cell
Li-Ion or Li-Polymer Battery, and discharge it down to
2.5V or lower. The buck-boost converter is based on
a fixed frequency, pulse-width-modulation (PWM)
controller using synchronous rectification to obtain
maximum efficiency. At low load currents, the
converter enters Power Save mode to maintain high
efficiency over a wide load current range. The Power
Save mode can be disabled, forcing the converter to
operate at a fixed switching frequency. The maximum
average current in the switches is limited to a typical
value of 1000 mA. The output voltage is
programmable using an external resistor divider, or is
fixed internally on the chip. The converter can be
disabled to minimize battery drain. During shutdown,
the load is disconnected from the battery. The device
is packaged in a 10-pin QFN PowerPAD™ package
measuring 2.5 mm × 2.5 mm (DSK).
L1
1.5 µH
V_IN
1.8 V to
5.5 V
C1
4.7 µF
L1
L2
VIN
VOUT
VINA
EN
FB
PS/SYNC
GND PGND
TPS63031
C2
10 µF
V_OUT
3.3 V up to
800 mA
1
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.
PowerPAD is a trademark of Texas Instruments.
2
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 © 2008–2009, Texas Instruments Incorporated