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Maxim Integrated - Bridge-Battery Backup Controllers for Notebooks

Numéro de référence MAX1612
Description Bridge-Battery Backup Controllers for Notebooks
Fabricant Maxim Integrated 
Logo Maxim Integrated 





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MAX1612 fiche technique
19-4785; Rev 0; 11/98
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Bridge-Battery Backup Controllers
for Notebooks
General Description
The MAX1612/MAX1613 manage the bridge battery
(sometimes called a hot-swap or auxiliary battery) in
portable systems such as notebook computers. They
feature a step-up DC-DC converter that boosts 2-cell or
3-cell bridge-battery voltages up to the same level as
the main battery. This voltage boosting technique
reduces the number of cells otherwise required for a 6-
cell plus diode-OR bridging scheme, reducing overall
size and cost. Another key feature is a trickle-charge
timer that minimizes battery damage caused by con-
stant charging and eliminates trickle-charge current
drain on the main battery once the bridge battery is
topped off.
These devices contain a highly flexible collection of
independent circuit blocks that can be wired together
in an autonomous stand-alone configuration or used in
conjunction with a microcontroller. In addition to the
boost converter and charge timer, there is a micropow-
er linear regulator (useful for RTC/CMOS backup as
well as for powering a microcontroller) and a high-pre-
cision low-battery detection comparator.
The two devices differ only in the preset linear-regulator
output voltage: +5.0V for the MAX1612 and +3.3V for
the MAX1613. Both devices come in a space-saving
16-pin QSOP package.
Applications
Notebook Computers
Portable Equipment
Backup Battery Applications
Features
o Reduce Battery Size and Cost
o Four Key Circuit Blocks
Adjustable Boost DC-DC Converter
NiCd/NiMH Trickle Charger
Always-On Linear Regulator (+28V Input)
Low-Battery Detector
o Low 18µA Quiescent Current
o Selectable Charging/Discharging Rates
o Preset Linear-Regulator Voltage
5V (MAX1612)
3.3V (MAX1613)
o 4V to 28V Main Input Voltage Range
o Internal Switch Boost Converter
o Small 16-Pin QSOP Package
PART
MAX1612EEE
MAX1613EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 QSOP
Typical Operating Circuit
Pin Configuration
MAIN BATTERY
OR
WALL
ADAPTER
LRI
DC-DC
OUTPUT
V+
BBATT
AUXILIARY
BRIDGE
BATTERY
MAX1612
MAX1613
APPLICATION
CIRCUIT
MAX1630
DC-DC
CONVERTER
+3.3V
+5V
VCPU
TOP VIEW
ISET 1
BBATT 2
LX 3
LBO 4
BBON 5
DCMD 6
CCMD 7
FULL 8
MAX1612
MAX1613
QSOP
16 LRI
15 LRO
14 PGND
13 CD
12 CC
11 GND
10 LBI
9 FB
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.

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