TPS61252 Datasheet, PDF (1/21 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – TINY 1.5-A BOOST CONVERTER WITH ADJUSTABLE INPUT CURRENT LIMIT

TPS61252
www.ti.com
SLVSAG3 – SEPTEMBER 2010
TINY 1.5-A BOOST CONVERTER WITH ADJUSTABLE INPUT CURRENT LIMIT
Check for Samples: TPS61252
FEATURES
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• 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
• Short Circuit Protection
• Typical Operating Frequency 3.25 MHz
• Available in a 2×2-mm QFN-8 Package
APPLICATIONS
• USB Host Supplies from a Single Li-Ion
Battery
• Current Limited Applications
• Li-Ion Applications
• Audio Applications
• RF-PA Buffer
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).
V_IN
2.3 V to
6.0 V
L1
1 μH
C1
10 µF
R_ILIM
20 kΩ
L
VOUT
VIN
EN
FB
ILIM
GND
PG
TPS61252
R1
768 kΩ
R2
243 kΩ
C_FF
100 pF
R4
1 MΩ
V_OUT
5.0 V
C_OUT
22 µF
Power Good
Output
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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