TPS62560 Datasheet, PDF (1/29 Pages) Texas Instruments – 2.25-MHz, 600-mA Step-Down Converter in TSOT and 2- × 2- × 0,8-mm SON Package

TPS62560
TPS62561, TPS62562
www.ti.com ........................................................................................................................................... SLVS815B – JANUARY 2008 – REVISED NOVEMBER 2008
2.25-MHz, 600-mA Step-Down Converter in TSOT and 2- × 2- × 0,8-mm SON Package
FEATURES
1
• 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
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.
V_IN = 2.5 V to 5.5 V
C_IN
4.7 mF
TPS62560DRV
V_IN
SW
EN
GND
FB
MODE
L
2.2 mH
R₁
R₂
C₁
22 pF
Up to 600 mA
V_OUT
C_OUT
10 mF
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.
100
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
V_OUT = 1.8 V
MODE = GND
20
L = 2.2 mH
10
DCR 110 mR
0
0.01
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