MAX1572ETC250 Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1572ETC250 ,800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESETApplicationsMAX1572ETC130 -40°C to +85°C 12 Thin QFN-EP**Cell Phones and Smart PhonesMAX1572ETC150 ..
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MAX1572ETC250
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 convertercan
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) RESEToutput 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
FeaturesUp to 97% Efficiency2MHz PWM Switching800mA Guaranteed Output CurrentLow 48µA Quiescent CurrentPower-Saving Modes: Pulse-Group, Pulse-Skip,
Forced-PWM Mode0.75V to 2.5V Preset Output Range
(in 50mV Increments)Voltage-Positioning Load Transients5mVP-P Output RippleTiny 2.2µH Inductor10µF Ceramic Output CapacitorLow 0.1µA Shutdown CurrentNo External Schottky Diode RequiredSoft-Start with Zero Inrush Current170ms (min) RESETOutputSmall 12-Pin, 4mm x 4mm Thin QFN Package
MAX1572
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
Pin Configuration
Typical Operating Circuit
*xyz is for the output voltage (e.g., MAX1572ETC165 has a
1.65V output). Minimum order quantity is 2500.
**EP = Exposed paddle.
Selector Guide appears at end of data sheet.
MAX1572
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ABATT, BATT, EN1, EN2, RESET, OUT,
SS to GND............................................................-0.3V to +6V
PGND to GND.......................................................-0.3V to +0.3V
LX Current (Note 1).............................................................±2.1A
Output Short-Circuit Duration............................................Infinite
Continuous Power Dissipation (TA= +70°C)
12-Pin Thin QFN (derate 16.9mW/°C above +70°C)...1349mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Note 1:LX has internal clamp diodes to PGND and BATT. Applications that forward bias these diodes should take care not to
exceed the IC’s package power dissipation limits.
MAX1572
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
ELECTRICAL CHARACTERISTICS (continued)
(VBATT= 3.6V, TA= +0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS
(VBATT= 3.6V, TA= -40°C to +85°C, unless otherwise noted.) (Note 3)
MAX1572
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
ELECTRICAL CHARACTERISTICS (continued)
(VBATT= 3.6V, TA= -40°C to +85°C, unless otherwise noted.) (Note 2)
Note 2:Guaranteed by design, not production tested.
Note 3:Specifications to -40°C are guaranteed by design and not production tested.
Typical Operating Characteristics
(VBATT = 3.6V, VOUT= 1.5V, EN1 = GND, EN2 = BATT, TA= +25°C, unless otherwise noted.)
MAX1572
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
INPUT CURRENT vs. INPUT VOLTAGE
WITH NO LOAD
MAX1572toc07
INPUT VOLTAGE (V)
INPUT CURRENT (
HEAVY-LOAD SWITCHING WAVEFORMS
MAX1572 toc08
VLX
VOUT
RIPPLE10mV/div
500mA/div
2V/div
200ns/div
LIGHT-LOAD SWITCHING WAVEFORMS
MAX1572 toc09
VLX
VOUT
RIPPLE20mV/div
500mA/div
2V/div
2µs/div
SOFT-START/SHUTDOWN WAVEFORMS
MAX1572 toc10
VEN2
IIN
VOUT1V/div
100mA/div
2V/div
200µs/div
RESET WAVEFORM
MAX1572 toc11
VEN2
IIN
VRESET
VOUT1V/div
1V/div
100mA/div
2V/div
100ms/div
LOAD TRANSIENT, FORCED-PWM MODE
MAX1572 toc12
ILOAD
VOUT
500mA/div
100mV/div
4µs/divypical Operating Characteristics (continued)
(VBATT = 3.6V, VOUT= 1.5V, EN1 = GND, EN2 = BATT, TA= +25°C, unless otherwise noted.)
MAX1572
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with RESET
LOAD TRANSIENT, PULSE-SKIP MODE
MAX1572 toc13
ILOAD
VOUT
500mA/div
100mV/div
4µs/div
LOAD TRANSIENT, PULSE-GROUP MODE
MAX1572 toc14
ILOAD
VOUT
500mA/div
100mV/div
4µs/div
LINE TRANSIENT
MAX1572 toc15
VIN
VOUT
200mA/div
20mV/div
1V/div
40µs/divypical Operating Characteristics (continued)
(VBATT = 3.6V, VOUT= 1.5V, EN1 = GND, EN2 = BATT, TA= +25°C, unless otherwise noted.)

Partno	Mfg	Dc	Qty	Available	Descript
MAX1572ETC250	MAXI	N/a	96	avai	800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESET