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SLVS815B – JANUARY 2008 – REVISED NOVEMBER 2008
2.25-MHz, 600-mA Step-Down Converter in TSOT and 2- × 2- × 0,8-mm SON Package
1
FEATURES
High-Efficiency Step-Down Converter
Output Current up to 600 mA
Wide V
IN
Range from 2.5 V to 5.5 V for Li-Ion
Batteries With Extended Voltage Range
Adjustable and Fixed Output-Voltage Options
2.25-MHz Fixed-Frequency Operation
Power-Save Mode at Light Load Currents
Output Voltage Accuracy in PWM Mode ±2.5%
Typical 15-µA Quiescent Current
100% Duty Cycle for Lowest Dropout
Soft Start
Voltage Positioning at Light Loads
Available in a Small TSOT, and
2-mm × 2-mm × 0,8-mm SON Package
Allows < 1-mm Solution Height
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With a wide input voltage range of 2.5 V to 5.5 V, the
devices support applications powered by Li-Ion
batteries with extended voltage range, two- and
three-cell alkaline batteries, 3.3-V and 5-V input
voltage rails. They operate at 2.25-MHz fixed
switching frequency and enter 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
devices can be forced into the fixed-frequency PWM
mode by pulling the MODE terminal high. In
shutdown mode, the current consumption is reduced
to less than 1
µA.
Switching at 2.25-MHz allows the
use of small inductors and capacitors to achieve a
small solution size.
Operating in a forced fixed-frequency PWM mode,
the TPS62561 devices allow simple filtering of the
switching frequency, e.g., for noise-sensitive
applications.
TPS62560 and TPS62562 are available in a 2-mm ×
2-mm 6-terminal SON package, whereas TPS62561
is available in a 5-terminal TSOT23 package.
Providing a fixed-output-voltage version, this
TPS62562 enables a even smaller solution size with
no external resistors needed.
APPLICATIONS
PDAs, Pocket PCs, Portable Media Players
Low-Power DSP Supply
POL Applications
DESCRIPTION
The TPS6256x devices are efficient synchronous
step-down
dc-dc
converters
optimized
for
battery-powered applications. They provide up to
600-mA output current from a single Li-Ion cell and
are ideal to power mobile phones and other portable
applications.
100
90
V = 2.7 V
IN
80
V
IN
= 3 V
V
IN
C
IN
4.7
m
F
GND
MODE
FB
R
2
EN
Up to 600 mA
V
OUT
C
OUT
10
m
F
SW
R
1
h
– Efficiency – %
V
IN
= 2.5 V to 5.5 V
TPS62560DRV
L
2.2
m
H
C
1
22 pF
70
V
IN
= 3.6 V
V
IN
= 4.5 V
60
50
40
30
20
10
0
0.01
V
OUT
= 1.8 V
MODE = GND
L = 2.2
m
H
DCR 110 mR
0.1
1
10
100
I
OUT
– Output Current – mA
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.
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
TI [ TEXAS INSTRUMENTS ]
