TPS62240 Datasheet, PDF (1/29 Pages) Texas Instruments – 2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package

TPS62240, TPS62242, TPS62243
www.ti.com
SLVS762B – JUNE 2007 – REVISED SEPTEMBER 2007
2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package
FEATURES
1
•23 High Efficiency Step Down Converter
• Output Current up to 300 mA
• V_IN Range From 2 V to 6 V for Li-Ion Batteries
With Extended Voltage Range
• 2.25 MHz Fixed Frequency Operation
• Power Save Mode at Light Load Currents
• Output Voltage Accuracy in PWM Mode ±1.5%
• Adjustable Output Voltage from 0.6 V to V_IN
• Typical 15 μA Quiescent Current
• 100% Duty Cycle for Lowest Dropout
• Available in a TSOT23 and 2×2×0,8 mm SON
• Allows < 1 mm Solution Height
APPLICATIONS
• Bluetooth™ Headset
• Cell Phones, Smart-phones
• WLAN
• PDAs, Pocket PCs
• Low Power DSP Supply
• Portable Media Players
• Digital Cameras
DESCRIPTION
The TPS62240 device is a high efficiency
synchronous step down dc-dc converter optimized for
battery powered portable applications. It provides up
to 300 mA output current from a single Li-Ion cell and
is ideal to power portable applications like mobile
phones and other portable equipment..
With an input voltage range of 2 V to 6 V, the device
supports applications powered by Li-Ion batteries with
extended voltage range, two- and three-cell alkaline,
3.3-V and 5-V input voltage rails.
The TPS62240 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.
The Power Save Mode is optimized for low output
voltage ripple. For low noise applications, 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 1 μA.
TPS62240 allows the use of small inductors and
capacitors to achieve a small solution size.
The TPS62240 is available in a 5-pin TSOT23 and
6-pin 2mm×2mm SON package.
V_IN 2.0V to 6V
C_IN
4.7µF
TPS62243DRV
V_IN
SW
EN
GND
FB
MODE
L₁
2.2µH
V_OUT 1.8V
Up to 300mA
C_OUT
10µF
100
90 ^V_I ^{= 2 V}
80 ^{VI = 2.7}
V_I = 3 V
70
60
V_I = 3.6
50
V_I = 4.5
40
V_I = 2 V
V_I = 4.5
30
20
10
0
0.01
V_O = 1.8 V,
MODE = GND,
L = 2.2 mH,
DCR 110 mΩ
0.1
1
10
100 1000
I_O - Output Current - mA
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
Bluetooth is a trademark of Bluetooth SIG, Inc..
3
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 © 2007, Texas Instruments Incorporated