MAX863 Maxim, MAX863 Datasheet
MAX863
Manufacturer Part Number
MAX863
Description
Dual / High-Efficiency / PFM / Step-Up DC-DC Controller
Manufacturer
Maxim
Datasheet
1.MAX863.pdf
(16 pages)
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The MAX863 dual-output DC-DC converter contains
two independent step-up controllers in a single com-
pact package. This monolithic bi-CMOS design draws
only 85µA when both controllers are on. The input
range extends down to 1.5V, permitting use in organiz-
ers, translators, and other low-power hand-held prod-
ucts. The MAX863 provides 90% efficiency at output
loads from 20mA to over 1A. This space-saving device
is supplied in a 16-pin QSOP package that fits in the
same area as an 8-pin SOIC.
The device uses a current-limited, pulse-frequency-
modulated (PFM) control architecture that reduces start-
up surge currents and maintains low quiescent currents
for excellent low-current efficiency. Each controller
drives a low-cost, external, N-channel MOSFET switch,
whose size can be optimized for any output current or
voltage.
In larger systems, two MAX863s can be used to gener-
ate 5V, 3.3V, 12V, and 28V from just two or three bat-
tery cells. An evaluation kit (MAX863EVKIT) is available
to speed designs. For a single-output controller, refer to
the MAX608 and MAX1771 data sheets.
________________________Applications
19-1218; Rev 1; 6/97
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Description
__________________Pin Configuration
TOP VIEW
2- and 3-Cell Portable Equipment
Organizers
Translators
Hand-Held Instruments
Palmtop Computers
Personal Digital Assistants (PDAs)
Dual Supply (Logic and LCD)
SENSE1
PGND
BOOT
EXT1
GND
CS1
V
FB1
DD
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
6
7
8
MAX863
QSOP
Dual, High-Efficiency, PFM, Step-Up
16
15
14
13
12
11
10
9
REF
SHDN2
LBI
LBO
FB2
SHDN1
CS2
EXT2
____________________________Features
*
__________Typical Operating Circuit
Dice are tested at T
______________Ordering Information
MAX863C/D
MAX863EEE
V
OUT1
IN
Smallest Dual Step-Up Converter: 16-Pin QSOP
90% Efficiency
1.5V Start-Up Voltage
85µA Max Total Quiescent Supply Current
1µA Shutdown Mode
Independent Shutdown Inputs
Drives Surface-Mount, Dual N-Channel MOSFETs
Low-Battery Input/Output Comparator
Step-Up/Down Configurable
PART
LOW-BATTERY
DETECTOR OUTPUT
DC-DC Controller
N
A
TEMP. RANGE
-40°C to +85°C
= +25°C.
0°C to +70°C
SENSE1 V
CS1
LBI
EXT1
LBO
FB1
MAX863
PGND
DD
SHDN1
SHDN2
BOOT
EXT2
GND
CS2
REF
FB2
Dice*
16 QSOP
PIN-PACKAGE
ON/OFF
N
OUT2
1
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