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PDF MAX1572 Data sheet ( Hoja de datos )
| Número de pieza | MAX1572 | |
| Descripción | PWM DC-to-DC Step-Down Converter | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1572 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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19-2837; Rev 0; 4/03
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
General Description
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.
Applications
Cell Phones and Smart Phones
PDAs, Palmtops, and Notebook Computers
MP3 and DVD Players
Digital Cameras and Camcorders
PCMCIA Cards
Hand-Held Instruments
Selector Guide appears at end of data sheet.
Typical Operating Circuit
INPUT
2.6V TO 5.5V
BATT
OUTPUT
0.75V TO 2.5V
2.2µH
800mA
LX
MAX1572
ABATT
PGND
MODE
SELECT
EN1 OUT
EN2 RESET
SS
GND
Features
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,
Forced-PWM Mode
o 0.75V to 2.5V Preset Output Range
(in 50mV Increments)
o Voltage-Positioning Load Transients
o 5mVP-P Output Ripple
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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1572ETC075 -40°C to +85°C 12 Thin QFN-EP**
MAX1572ETC130 -40°C to +85°C 12 Thin QFN-EP**
MAX1572ETC150 -40°C to +85°C 12 Thin QFN-EP**
MAX1572ETC180 -40°C to +85°C 12 Thin QFN-EP**
MAX1572ETC250 -40°C to +85°C 12 Thin QFN-EP**
MAX1572ETCxyz* -40°C to +85°C 12 Thin QFN-EP**
*xyz is for the output voltage (e.g., MAX1572ETC165 has a
1.65V output). Minimum order quantity is 2500.
**EP = Exposed paddle.
Pin Configuration
TOP VIEW
987
EN1 10
GND 11
ABATT 12
MAX1572
123
6 EN2
5 GND
4 OUT
4mm x 4mm
THIN QFN
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
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800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
Typical Operating Characteristics (continued)
(VBATT = 3.6V, VOUT = 1.5V, EN1 = GND, EN2 = BATT, TA = +25°C, unless otherwise noted.)
INPUT CURRENT vs. INPUT VOLTAGE
WITH NO LOAD
60
50
40
30
20
10
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
LIGHT-LOAD SWITCHING WAVEFORMS
MAX1572 toc09
VLX 2V/div
HEAVY-LOAD SWITCHING WAVEFORMS
MAX1572 toc08
VLX 2V/div
VOUT
RIPPLE
IL
10mV/div
500mA/div
200ns/div
ILOAD = 500mA
SOFT-START/SHUTDOWN WAVEFORMS
MAX1572 toc10
VEN2 2V/div
VOUT
RIPPLE
IL
20mV/div
ILOAD = 20mA
2µs/div
500mA/div
VOUT 1V/div
IIN 100mA/div
200µs/div
VEN2
VOUT
RESET WAVEFORM
MAX1572 toc11
2V/div
1V/div
LOAD TRANSIENT, FORCED-PWM MODE
MAX1572 toc12
VOUT 100mV/div
VRESET
IIN
100ms/div
1V/div
100mA/div
ILOAD
ILOAD = 20mA TO 550mA
4µs/div
500mA/div
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE
12,16,20,24L QFN THIN, 4x4x0.8 mm
21-0139
A
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX1572.PDF ] | |
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