TPS63020 Datasheet, PDF (1/22 Pages) Texas Instruments – HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 4-A SWITCHES

TPS63020
TPS63021
www.ti.com
SLVS916 – APRIL 2010
HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 4-A SWITCHES
Check for Samples: TPS63020, TPS63021
FEATURES
1
•2 Up to 96% Efficiency
• 3A Output Current at 3.3V in Step Down Mode
(VIN = 3.6V to 5.5V)
• More than 2A Output Current at 3.3V in Boost
Mode (VIN > 2.5V)
• Automatic Transition Between Step Down and
Boost Mode
• Dynamic Input Current Limit
• Device Quiescent Current less than 50mA
• 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 at 2.4MHz
and Synchronization Possible
• Smart Power Good Output
• Load Disconnect During Shutdown
• Overtemperature Protection
• Overvoltage Protection
• Available in a 3 × 4-mm, QFN-14 Package
APPLICATIONS
• All Two-Cell and Three-Cell Alkaline, NiCd or
NiMH or Single-Cell Li Battery Powered
Products
• Ultra Mobile PC's and Mobile Internet Devices
• Digital Media Players
• DSC's and Camcorders
• Cellular Phones and Smartphones
• Personal Medical Products
• Industrial Metering Equipment
• High Power LED's
DESCRIPTION
The TPS6302x 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 3A 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 4A. 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 14-pin QFN PowerPAD™ package
measuring 3 × 4 mm (DSJ).
V_IN
1.8 V to
C1
5.5 V
L1
1.5 µH
L1
L2
VIN
VOUT
VINA
FB
EN
PS/SYNC PG
V_OUT
C2 ^{3.3 V}
up to 3 A
GND
PGND
TPS63021
Power Good
Output
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 © 2010, Texas Instruments Incorporated