www.ti.com
SLVSAG3 – SEPTEMBER 2010
TINY 1.5-A BOOST CONVERTER WITH ADJUSTABLE INPUT CURRENT LIMIT
Check for Samples:
1
FEATURES
Resistor Programmable Input Current Limit
– ±20% Current Accuracy at 500 mA over Full
Temperature Range
– Programmable from 100 mA up to 1500 mA
Up to 92% Efficiency
V
IN
Range from 2.3 V to 6.0 V
Power Good Indicates Appropriate Output
Voltage Level
Adjustable Output Voltage up to 6.5 V
100% Duty-Cycle Mode When V
IN
> V
OUT
Load Disconnect and Reverse Current
Protection
•
•
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Short Circuit Protection
Typical Operating Frequency 3.25 MHz
Available in a 2×2-mm QFN-8 Package
APPLICATIONS
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USB Host Supplies from a Single Li-Ion
Battery
Current Limited Applications
Li-Ion Applications
Audio Applications
RF-PA Buffer
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DESCRIPTION
The TPS61252 device provides a power supply solution for products powered by either a three-cell alkaline,
NiCd or NiMH battery, or an one-cell Li-Ion or Li-polymer battery. The wide input voltage range is ideal to power
portable applications like mobile phones or for computer peripherals. The device has a resistor programmable
(R
ILIM
) input current limit and is suitable for a wide variety of applications.
During light loads the device will automatically enter skip mode (PFM), which allows the converter to maintain the
required output voltage, while only drawing 30
mA
from the battery. This will allow maximum efficiency at lowest
quiescent currents.
TPS61252 allows the use of small inductors and input capacitors to achieve a small solution size. The possibility
to reduce the current limit by a external resistor offers the potential use of physically even smaller inductors with
lower rated current to further reduce total solution sizes of the power supply. During shutdown, the load is
completely disconnected from the battery. The TPS61252 is available in a 8-pin QFN package measuring 2×2
mm (DSG).
L1
1 H
V
OUT
L
VIN
VOUT
5.0 V
R1
768 k
C
FF
100 pF
R4
1M
R2
243 k
C
OUT
22 µF
V
IN
2.3 V to
6.0 V
C1
10 µF
EN
ILIM
FB
R
ILIM
20 k
GND
PG
Power Good
Output
TPS61252
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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 © 2010, Texas Instruments Incorporated
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
