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MAX1878EGC Datasheet

  • MAX1878EGC

  • 雙輸出、降壓型及LCD升壓型電源，用于PDA

  • 12頁

  • MAXIM   MAXIM

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19-2248; Rev 0; 10/01
KIT
ATION
EVALU
BLE
AVAILA
Dual-Output Step-Down and LCD Step-Up
Power Supply for PDAs
General Description
The MAX1878 dual power supply contains a step-down
and step-up DC-DC converter in a small 12-pin QFN
package for use in PDAs. The step-down DC-DC convert-
er delivers over 500mA to an output as low as 1.25V for
logic power. The step-up DC-DC converter delivers over
15mA and an output as high as 28V for a liquid crystal dis-
play (LCD). With an input voltage from 2.0V to 5.5V the
MAX1878 is intended for use in systems powered by a
2-cell alkaline or 1-cell lithium-ion (Li+) battery.
Fast switching frequency allows the use of small inductors
and capacitors, and the low 19碌A typical quiescent cur-
rent allows high efficiency when the system is in standby
mode. Each output can be independently enabled.
The MAX1878 is available in a small 1mm high 4mm x
4mm 12-pin QFN package and requires no external FETs.
The MAX1878 evaluation kit is available to speed designs.
o
Two Output Voltages
Main Output: 1.25V to V
IN
LCD Output: Up to 28V
o
2.0V to 5.5V Input Range
o
Low 19碌A Quiescent Supply Current
o
1碌A Shutdown Supply Current
o
High Switching Frequency for Small External
Components
o
Small 1mm High 4mm x 4mm 12-Pin QFN Package
Features
o
Evaluation Kit Available to Speed Designs
MAX1878
________________________Applications
Personal Digital Assistants (PDA)
Organizers/Translators
MP3 Players
GPS Receivers
PART
MAX1878EGC
Ordering Information
TEMP. RANGE
-40擄C to +85擄C
PIN-
PACKAGE
12-QFN
TOP
MARK
AAAO
__________Typical Operating Circuit
INPUT
2.0V TO 5.5V
10碌H
Pin Configuration
PGNDLCD
11
TOP VIEW
IN
LXLCD
FBLCD
AIN1
AIN2
10碌H
LCD OUTPUT
UP TO 28V
0.1碌F
12
IN
1
2
ONLCD
10
9
8
7
LXLCD
AGND
ON
6
FBLCD
MAX1878
LX
FB
MAIN OUTPUT
1.25V TO V
IN
LX
AIN1
ON
MAIN
LCD
OFF
ON
OFF
ONLCD
ON
3
PGND
4
AIN2
MAX1878EGC
5
FB
PGND
AGND PGNDLCD
4mm x 4mm QFN
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

MAX1878EGC 產(chǎn)品屬性

  • Maxim Integrated Products

  • 5.5 V

  • 500 KHz

  • 1.25 V, 28 V

  • 500 mA, 1.5mA

  • 2

  • SMD/SMT

  • 2 V

  • 1 %

  • QFN EP

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