MAX1775 Maxim, MAX1775 Datasheet
MAX1775
Manufacturer Part Number
MAX1775
Description
Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers
Manufacturer
Maxim
Datasheet
1.MAX1775.pdf
(15 pages)
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The MAX1775 is a dual, step-down DC-DC converter
that generates both the main (+3.3V at over 2A) and
core (+1.8V at up to 1.5A) supplies for a complete
power solution for PDAs, subnotebooks, and other
hand-held devices. The main output is adjustable from
+1.25V to +5.5V. The core output is adjustable from 1V
to 5V. Both switching converters operate at up to
1.25MHz for small external components and use syn-
chronous rectifiers to achieve efficiencies up to 95%.
Operation with up to 100% duty cycle provides the low-
est possible dropout voltage to extend useful battery
life.
The MAX1775 accepts inputs from +2.7V up to +28V,
allowing use with many popular battery configurations as
well as AC-DC wall adapters. Digital soft-start reduces
battery current surges at power-up. Both the main and
core converters have separate shutdown inputs. The
MAX1775 comes in a small 16-pin QSOP package.
The MAX1775 evaluation kit is available to help reduce
design time.
19-1811; Rev 1; 8/01
________________________Applications
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.
TOP VIEW
DC-DC Converter for PDA/Palmtop Computers
Hand-Held Computers
PDAs
Internet Access Tablets
POS Terminals
Subnotebooks
SHDNM
SHDNC
PGND
NDRV
PDRV
CVH
CVL
IN
________________________________________________________________ Maxim Integrated Products
1
2
6
3
4
5
7
8
General Description
16 QSOP
MAX1775
Pin Configuration
16
15
14
13
12
11
10
9
LXC
INC
GND
FBC
CS-
CS+
FBM
REF
Dual-Output Step-Down
o Dual, High-Efficiency, Synchronous Rectified
o Main Power
o Core Power
o 100% (max) Duty Cycle
o Up to 1.25MHz Switching Frequency
o Input Voltage Range from +2.7V to +28V
o 170µA Quiescent Current
o 5µA Shutdown Current
o Digital Soft-Start
o Independent Shutdown Inputs
ON
ON
Step-Down Converter
MAX1775EEE
Adjustable from +1.25V to +5.5V
Over 2A Load Current
Up to 95% Efficiency
Adjustable from 1V to 5V
Internal Switches
Up to 1.5A Load Current
Up to 92% Efficiency
OFF
OFF
PART
CVL
REF
PGND
GND
SHDNM
SHDNC
IN 2.7V TO 5.5V (28V IN CASCADE)
MAX1775
IN
Typical Operating Circuit
CVH
NDRV
PDRV
FBM
INC
CS+
LXC
FBC
CS-
TEMP. RANGE
-40°C to +85°C
Ordering Information
CORE
1.8V
1.5A
PIN-PACKAGE
16 QSOP
Features
MAIN
3.3V
OVER 2A
1
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