TPS62750 Datasheet, PDF (1/27 Pages) Texas Instruments – High Efficiency Step-Down Converter for USB Applications

TPS62750
www.ti.com ....................................................................................................................................................................................................... SLVS955 – JULY 2009
High Efficiency Step-Down Converter for USB Applications
FEATURES
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• Efficiency > 90% at Nominal Operating
Conditions
• Programmable Average Input Current Limits
for USB Applications
– 50mA to 300mA for Low Current Limit
Range
– 300mA to 1.3A for High Current Limit
Range
– ±10% Current Accuracy
• Stable Output Voltage for Load Transients to
Minimize Overshoot at Load Step Response
• Hot Plug and Reverse Current Protection
• Automatic PFM/PWM Mode transition
• V_IN Range From 2.9V to 6V
• Adjustable V_OUT From 0.8V to 0.85×VIN
• Softstart for Inrush Current Prevention
• 2.25 MHz Fixed Frequency Operation
• Short Cicruit and Thermal Shutdown
Protection
• Available in a 2.5 × 2.5 10 pin SON Package
APPLICATIONS
• USB Wireless Modems
• Portable USB peripherals
• Handheld Computers
DESCRIPTION
The TPS62750 device is a highly efficient
synchronous step down dc-dc converter optimized for
USB powered portable applications. It can provide up
to 1300mA average input current and is ideal for
applications connected to a USB host.
With an input voltage range of 2.9 V to 6.0V, the
device supports batteries with extended voltage
range and is ideal for powering USB applications
where USB compliance is required.
The TPS62750 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. Output discharge allows the
load to discharge in shutdown.
The 10% accurate average input current limit can be
programmed with an external resistor, allowing use in
applications such as USB, where the current drawn
from the bus must be limited to 500mA.
The TPS62750 allows the use of small inductors and
capacitors to achieve a small solution size. The
TPS62750 is available in a 2,5mm × 2,5mm 10-pin
SON package.
V_IN 5.0V
TPS62750
V_IN
L
AV _IN
EN
FB
I_{lim_U}
H/L
C_IN
GND
I_{lim_L}
PGND
R₃
R₄
2.2 µH
L_{1 R1}
R₂
V_OUT 3.6V
C_ff
C_O
C_BULK
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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 © 2009, Texas Instruments Incorporated