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Maxim Integrated Products - 16uA IQ 1.2A PWM Step-Down DC-DC Converters

Numéro de référence MAX1556
Description 16uA IQ 1.2A PWM Step-Down DC-DC Converters
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products 





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MAX1556 fiche technique
19-3336; Rev 0; 7/04
EVAALVUAAILTAIOBNLEKIT
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16µA IQ, 1.2A PWM
Step-Down DC-DC Converters
General Description
The MAX1556/MAX1557 are low-operating-current
(16µA), fixed-frequency step-down regulators. High effi-
ciency, low-quiescent operating current, low dropout,
and minimal (27µA) quiescent current in dropout make
these converters ideal for powering portable devices
from 1-cell Li-ion or 3-cell alkaline/NiMH batteries. The
MAX1556 delivers up to 1.2A; has pin-selectable 1.8V,
2.5V, and 3.3V outputs; and is also adjustable. The
MAX1557 delivers up to 600mA; has pin-selectable 1V,
1.3V, and 1.5V outputs; and is also adjustable.
The MAX1556/MAX1557 contain a low-on-resistance
internal MOSFET switch and synchronous rectifier to
maximize efficiency and dropout performance while
minimizing external component count. A proprietary
topology offers the benefits of a high fixed-frequency
operation while still providing excellent efficiency at
both light and full loads. A 1MHz PWM switching fre-
quency keeps components small. Both devices also
feature an adjustable soft-start to minimize battery tran-
sient loading.
The MAX1556/MAX1557 are available in a tiny 10-pin
TDFN (3mm x 3mm) package.
Applications
PDAs and Palmtop Computers
Cell Phones and Smart Phones
Digital Cameras and Camcorders
Portable MP3 and DVD Players
Hand-Held Instruments
Typical Operating Circuit
Features
Up to 97% Efficiency
95% Efficiency at 1mA Load Current
Low 16µA Quiescent Current
1MHz PWM Switching
Tiny 3.3µH Inductor
Selectable 3.3V, 2.5V, 1.8V, 1.5V, 1.3V, 1.0V, and
Adjustable Output
1.2A Guaranteed Output Current (MAX1556)
Voltage Positioning Optimizes Load-Transient
Response
Low 27µA Quiescent Current in Dropout
Low 0.1µA Shutdown Current
No External Schottky Diode Required
Analog Soft-Start with Zero Overshoot Current
Small, 10-Pin, 3mm x 3mm TDFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
TOP
MARK
MAX1556ETB
-40°C to +85°C
10 TDFN-EP*
(T1033-1)
MAX1557ETB
-40°C to +85°C
10 TDFN-EP*
(T1033-1)
*EP = Exposed paddle.
ACQ
ACR
Pin Configuration
INPUT
2.6V TO 5.5V
VOLTAGE
SELECT
ON
OFF
INP LX
MAX1556/
MAX1557
PGND
IN
D1 OUT
D2
SS
SHDN
GND
OUTPUT
0.75V TO VIN
TOP VIEW
IN 1
GND 2
SS 3
OUT 4
SHDN 5
MAX1556/
MAX1557
10 D1
9 INP
8 LX
7 PGND
6 D2
TDFN
________________________________________________________________ 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.

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