MAX1572 Maxim Integrated Products, MAX1572 Datasheet
MAX1572
Manufacturer Part Number
MAX1572
Description
PWM DC-to-DC Step-Down Converter
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1572.pdf
(11 pages)
The MAX1572 is a fixed-frequency, synchronous step-
down DC-to-DC converter to power low-voltage micro-
processor/DSP cores in portable equipment requiring
high efficiency in a limited PC board area. The features
are optimized for high efficiency over a wide load range,
small external component size, low output ripple, and
excellent transient response. The input supply voltage
range is from 2.6V to 5.5V, while the output is internally
fixed from 0.75V to 2.5V in 50mV increments with a
guaranteed output current of 800mA. The high 2MHz
switching allows tiny low-cost capacitors and a low-pro-
file inductor, while the power-saving pulse-group mode
reduces quiescent current to 48µA (typ) with light loads.
To reduce noise and RF interference, the converter can
be configured to provide forced-PWM operation.
The MAX1572 includes a low on-resistance internal
MOSFET switch and synchronous rectifier to maximize
efficiency and minimize external component count. No
external diode is needed. Other features include soft-
start to eliminate inrush current at startup and a 170ms
(min) RESET output to provide power-on/undervoltage
reset. The MAX1572 is available in a 12-pin, 4mm x
4mm thin QFN package with exposed paddle.
19-2837; Rev 0; 4/03
Selector Guide appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
INPUT
2.6V TO 5.5V
Cell Phones and Smart Phones
PDAs, Palmtops, and Notebook Computers
MP3 and DVD Players
Digital Cameras and Camcorders
PCMCIA Cards
Hand-Held Instruments
SELECT
MODE
Typical Operating Circuit
BATT
ABATT
EN1
EN2
SS
________________________________________________________________ Maxim Integrated Products
MAX1572
General Description
GND
RESET
PGND
OUT
LX
Step-Down Converter with RESET
Applications
2.2µH
0.75V TO 2.5V
800mA, 2MHz, PWM DC-to-DC
OUTPUT
800mA
o Up to 97% Efficiency
o 2MHz PWM Switching
o 800mA Guaranteed Output Current
o Low 48µA Quiescent Current
o Power-Saving Modes: Pulse-Group, Pulse-Skip,
o 0.75V to 2.5V Preset Output Range
o Voltage-Positioning Load Transients
o 5mV
o Tiny 2.2µH Inductor
o 10µF Ceramic Output Capacitor
o Low 0.1µA Shutdown Current
o No External Schottky Diode Required
o Soft-Start with Zero Inrush Current
o 170ms (min) RESET Output
o Small 12-Pin, 4mm x 4mm Thin QFN Package
*xyz is for the output voltage (e.g., MAX1572ETC165 has a
1.65V output). Minimum order quantity is 2500.
**EP = Exposed paddle.
MAX1572ETC075
MAX1572ETC130
MAX1572ETC150
MAX1572ETC180
MAX1572ETC250
MAX1572ETCxyz*
Forced-PWM Mode
(in 50mV Increments)
P-P
PART
TOP VIEW
Output Ripple
ABATT
GND
EN1
10
11
12
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
4mm x 4mm
THIN QFN
1
9
MAX1572
8
2
Pin Configuration
7
3
www.DataSheet4U.com
6
5
4
PIN-PACKAGE
12 Thin QFN-EP**
12 Thin QFN-EP**
12 Thin QFN-EP**
12 Thin QFN-EP**
12 Thin QFN-EP**
12 Thin QFN-EP**
GND
OUT
EN2
Features
1
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