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LQH32CN

Description
16μA IQ, 1.2A PWM Step-Down DC-DC Converters
File Size274KB,12 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

LQH32CN Overview

16μA IQ, 1.2A PWM Step-Down DC-DC Converters

19-3336; Rev 2; 6/10
KIT
ATION
EVALU
E
BL
AVAILA
16µA I
Q
, 1.2A PWM
Step-Down DC-DC Converters
General Description
Features
o
Up to 97% Efficiency
o
95% Efficiency at 1mA Load Current
o
Low 16µA Quiescent Current
o
1MHz PWM Switching
o
Tiny 3.3µH Inductor
o
Selectable 3.3V, 2.5V, 1.8V, 1.5V, 1.3V, 1.2V, 1.0V,
and Adjustable Output
o
1.2A Guaranteed Output Current
(MAX1556/MAX1556A)
o
Voltage Positioning Optimizes Load-Transient
Response
o
Low 27µA Quiescent Current in Dropout
o
Low 0.1µA Shutdown Current
o
No External Schottky Diode Required
o
Analog Soft-Start with Zero Overshoot Current
o
Small, 10-Pin, 3mm x 3mm TDFN Package
MAX1556/MAX1556A/MAX1557
The MAX1556/MAX1556A/MAX1557 are low-operating-
current (16µA), fixed-frequency step-down regulators.
High efficiency, 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/MAX1556A/MAX1557 contain a low-on-
resistance internal MOSFET switch and synchronous
rectifier to maximize efficiency and dropout perfor-
mance while minimizing external component count. A
proprietary topology offers the benefits of a high fixed-
frequency operation while still providing excellent effi-
ciency at both light and full loads. A 1MHz PWM
switching frequency keeps components small. Both
devices also feature an adjustable soft-start to minimize
battery transient loading.
The MAX1556/MAX1556A/MAX1557 are available in a
tiny 10-pin TDFN (3mm x 3mm) package.
Ordering Information
PART
MAX1556ETB+
MAX1556AETB+
MAX1557ETB+
TEMP RANGE
PIN-PACKAGE
TOP
MARK
ACQ
AUJ
ACR
Applications
PDAs and Palmtop Computers
Cell Phones and Smart Phones
Digital Cameras and Camcorders
Portable MP3 and DVD Players
Hand-Held Instruments
-40°C to +85°C 10 TDFN-EP*
-40°C to +85°C 10 TDFN-EP*
-40°C to +85°C 10 TDFN-EP*
*EP
= Exposed paddle.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
INPUT
2.6V TO 5.5V
OUTPUT
0.75V TO V
IN
INP
LX
TOP VIEW
Pin Configuration
IN
VOLTAGE
SELECT
ON
OFF
D1
D2
MAX1556
MAX1556A
MAX1557
PGND
OUT
SS
IN
GND
SS
OUT
SHDN
1
2
3
4
5
TDFN
10
9
D1
INP
LX
MAX1556
MAX1556A
MAX1557
8
7
6
PGND
D2
SHDN
GND
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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