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MAX1572ETC130+T

P1-P3P4-P6P7-P9P10-P11
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
Features
♦ Up to 97% Efficiency
♦ 2MHz PWM Switching
♦ 800mA Guaranteed Output Current
♦ Low 48µA Quiescent Current
♦ Power-Saving Modes: Pulse-Group, Pulse-Skip,
Forced-PWM Mode
♦ 0.75V to 2.5V Preset Output Range
(in 50mV Increments)
♦ Voltage-Positioning Load Transients
♦ 5mV
P-P
Output Ripple
♦ Tiny 2.2µH Inductor
♦ 10µF Ceramic Output Capacitor
♦ Low 0.1µA Shutdown Current
♦ No External Schottky Diode Required
♦ Soft-Start with Zero Inrush Current
♦ 170ms (min) RESET Output
♦ Small 12-Pin, 4mm x 4mm Thin QFN Package
MAX1572
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with
RESET
________________________________________________________________ Maxim Integrated Products 1
MAX1572
12
11
10
789
PGND
LX
BATT
321
GND
SS
RESET
4
5
6
EN1
GND
ABATT
EN2
GND
OUT
4mm x 4mm
THIN QFN
TOP VIEW
Pin Configuration
Ordering Information
LX
2.2µH
PGND
OUT
RESET
GND
ABATT
EN1
BATT
MODE
SELECT
INPUT
2.6V TO 5.5V
OUTPUT
0.75V TO 2.5V
800mA
EN2
SS
MAX1572
Typical Operating Circuit
19-2837; Rev 1; 11/04
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.
*xyz is for the output voltage (e.g., MAX1572ETC165 has a
1.65V output). Minimum order quantity is 2500.
**EP = Exposed paddle.
EVALUATION KIT
AVAILABLE
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**
Selector Guide appears at end of data sheet.
MAX1572
800mA, 2MHz, PWM DC-to-DC
Step-Down Converter with
RESET
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
BATT
= 3.6V, T
A
= +0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
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 (T
A
= +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
PARAMETER CONDITIONS MIN TYP MAX
UNITS
BATT Input Voltage 2.6 5.5 V
Undervoltage Lockout Threshold V
BATT
rising and falling, 1% hysteresis 2.20 2.35 2.55 V
EN1 = GND, EN2 = BATT, no switching 48 80
Quiescent Supply Current
EN1 = BATT, EN2 = GND, no switching 700
µA
Shutdown Supply Current EN1 = EN2 = GND, T
A
= +25°C 0.1 1 µA
Maximum Output Current 800
mA
OUT Bias Current 69µA
No load, EN1 = EN2 = BATT 1.2 2.7
100mA load -0.4 +0.8 +2.0
300mA load 0
550mA load -1
Output-Voltage Accuracy
(Voltage Positioning)
800mA load -2
%
Line Regulation 0.3
%/V
V
BATT
= 3.6V 0.28 0.45
P-Channel On-Resistance
I
LX
= 180mA
V
BATT
= 2.6V 0.33
Ω
V
BATT
= 3.6V 0.18 0.30
N-Channel On-Resistance
I
LX
= 180mA
V
BATT
= 2.6V 0.20
Ω
P-Channel Current-Limit Threshold 1.00 1.25 1.65 A
N-Channel Current-Limit Threshold EN1 = EN2 = BATT -0.68 -0.52 -0.37 A
N-Channel Zero-Crossing Threshold EN1 = BATT, EN2 = GND 15 40 65
mA
LX Output Current (Note 2) 1.4
A
RMS
LX Leakage Current EN1 = EN2 = GND 0.1 10 µA
Maximum Duty Cycle 100 %
EN1 = BATT, EN2 = GND or
EN1 = GND, EN2 = BATT
0
Minimum Duty Cycle
EN1 = EN2 = BATT 16.7 17.3
%
Switching Frequency 1.8 2 2.2
MHz
SS Output Impedance 65 100 150 kΩ
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
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 3.6V, T
A
= +0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS MIN TYP MAX
UNITS
SS Discharge Resistance EN1 = EN2 = GND 100 200 Ω
V
ABATT
> 4.2V 1.6
EN_ Logic Input High
V
ABATT
≤ 4.2V 1.4
V
EN_ Logic Input Low 0.4 V
EN_ Logic Input Current 0.1 1 µA
RESET Threshold Percent of nominal, measured at OUT 87 90 93 %
RESET Timer Delay Time From V
OUT
> 90% to RESET = HI 170 200 230 ms
RESET Output Low Level I
SINK
= 1mA
0.015
0.075 V
RESET Internal Pullup Resistance to OUT 9 14 20 kΩ
Thermal-Shutdown Threshold T
J
rising 160 °C
Thermal-Shutdown Hysteresis 20 °C
ELECTRICAL CHARACTERISTICS
(V
BATT
= 3.6V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER CONDITIONS MIN TYP MAX
BATT Input Voltage 2.6 5.5 V
Undervoltage Lockout Threshold V
BATT
rising and falling, 1% hysteresis 2.20 2.55 V
Quiescent Supply Current EN1 = GND, EN2 = BATT, no switching 80 µA
Shutdown Supply Current EN1 = EN2 = GND 3 µA
Maximum Output Current 800
OUT Bias Current 9µA
No load, EN1 = EN2 = BATT 3.2
Output-Voltage Accuracy
(Voltage Positioning)
100mA load -1.2 +2.8
%
P-Channel On-Resistance I
LX
= 180mA 0.45 Ω
N-Channel On-Resistance I
LX
= 180mA 0.3 Ω
N-Channel Current-Limit Threshold EN1 = EN2 = BATT -0.68 -0.22 A
N-Channel Zero-Crossing Threshold EN1 = BATT, EN2 = GND 10 65
LX Output Current (Note 2) 1.4
LX Leakage Current EN1 = EN2 = GND 10 µA
Maximum Duty Cycle 100 %
Minimum Duty Cycle EN1 = EN2 = BATT 17.3 %
Switching Frequency 1.8 2.2
SS Output Impedance 65 150 kΩ
SS Discharge Resistance EN1 = EN2 = GND 200 Ω
V
ABATT
> 4.2V 1.6
EN_ Logic Input High
V
ABATT
≤ 4.2V 1.4
V
P1-P3P4-P6P7-P9P10-P11

MAX1572ETC130+T

Mfr. #:
Buy MAX1572ETC130+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 800mA 2MHz PWM Step-Down w/Reset
Lifecycle:
New from this manufacturer.
Delivery:
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