TPS62250_13 Datasheet, PDF (1/30 Pages) Texas Instruments – Peak Current Limited Step Down Converter for USB Applications

TPS62250
www.ti.com.......................................................................................................................................................................................... SLVS842 – SEPTEMBER 2008
Peak Current Limited Step Down Converter for USB Applications
FEATURES
1
•2 High Efficiency Step Down Converter
• Max Peak Current Limit of 1A, Ideal for USB
Powered Applications
• V_IN Range Optimized for USB from 2V to 6V
• 2.25 MHz Fixed Frequency Operation
• Power Save Mode at Light Load Currents
• Output Voltage Accuracy in PWM mode ±1.5%
• Typ. 15 µA Quiescent Current
• 100% Duty Cycle for Lowest Dropout
• Soft Start
• Voltage Positioning at Light Loads
• Available in a Small 2×2×0,8mm SON package
• Allows <1mm Solution Height
APPLICATIONS
• Portable USB Peripherals
• Wireless Modem Applications
• USB PCTV Applications
DESCRIPTION
The TPS62250 device is a high efficient synchronous
step down dc-dc converter optimized for USB
powered applications. It provides up to 1A peak
output current and limits the average input current to
700mA, making it ideal for applications connected to
a USB host. With an wide input voltage range of 2V
to 6V, the device supports applications powered by
the USB host as well as general applications
requiring large output capacitors.
The TPS62250 operates at 2.25MHz fixed switching
frequency and enters Power Save Mode operation at
light load currents to maintain high efficiency over the
entire load current range.
The Power Save Mode is optimized for low output
voltage ripple. For low noise applications such as
USB Wireless Modems, the device can be forced into
fixed frequency PWM mode by pulling the MODE pin
high. In the shutdown mode, the current consumption
is reduced to less than 1µA. TPS62250 allows the
use of small inductors and capacitors to achieve a
small solution size.
The TPS62250 is available in a very small 2×2 6 pin
SON package.
V_IN = 2V to 6V
C_IN
4.7 mF
TPS62250DRV
V_IN
SW
EN
GND
FB
MODE
L
2.2 mH
R₁
R₂
C₁
22 pF
Up to 600mA
V_OUT
C_OUT
10 mF
100 _{VIN = 2.3 V}
90 _{VIN = 2.7 V}
80 V_IN = 3 V
70
V_IN = 3.6 V
60
V_IN = 4.5 V
50
40
30
20
10
0
0.01
V_OUT = 1.8 V,
MODE = GND,
L = 2.2 mH,
DCR 110 mR
0.1
1
10 100
I_O - Output Current -
1000
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, Texas Instruments Incorporated