Low-cost Multichemistry Battery Chargers

Maxim Integrated Products, Inc.

find MAX8724 datasheet
MAX8724 pinout,MAX8724 pin diagram
19-2764; Rev 4; 7/05
KIT
ATION
EVALU
BLE
AVAILA
Low-Cost Multichemistry Battery Chargers
General Description
The MAX1908 MAX8724 MAX8765 highly integrated, multi-
chemistry battery-charger control ICs simplify the construc-
tion of accurate and efficient chargers. These devices use
analog inputs to control charge current and voltage, and
can be programmed by the host or hardwired. The
MAX1908 MAX8724 MAX8765 achieve high efficiency
using a buck topology with synchronous rectification.
The MAX1908 MAX8724 MAX8765 feature input current
limiting. This feature reduces Battery charge current when
the input current limit is reached to avoid overloading the
AC adapter when supplying the load and the Battery
charger simultaneously. The MAX1908 MAX8724
MAX8765 provide outputs to monitor current drawn from
the AC adapter (DC input source), battery-charging cur-
rent, and the presence of an AC adapter. The MAX1908 s
conditioning charge feature provides 300mA to safely
charge deeply discharged lithium-ion (Li+) Battery packs.
The MAX1908 includes a conditioning charge feature
while the MAX8724 MAX8765 do not.
The MAX1908 MAX8724 MAX8765 charge two to four
series Li+ cells, providing more than 5A, and are avail-
able in a space-saving, 28-pin, thin QFN package (5mm
×
5mm). An evaluation kit is available to speed designs.
Features
±0.5% Output Voltage Accuracy Using Internal
Reference (0°C to +85°C)
±4% Accurate Input Current Limiting
±5% Accurate Charge Current
Analog Inputs Control Charge Current and
Charge Voltage
Outputs for Monitoring
Current Drawn from AC Adapter
Charging Current
AC Adapter Presence
Up to 17.6V Battery-Voltage Set Point
Maximum 28V Input Voltage
> 95% Efficiency
Shutdown Control Input
Charge Any Battery Chemistry
Li+, NiCd, NiMH, Lead Acid, etc.
Applications
Notebook and Subnotebook Computers
Personal Digital Assistants
Handheld Terminals
PART
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
28 Thin QFN
28 Thin QFN
28 Thin QFN
PKG CODE
T2855-6
T2855-6
T2855-6
Minimum Operating Circuit
AC ADAPTER
INPUT
0.01Ω
TO EXTERNAL
LOAD
Pin Configuration
TOP VIEW
CELLS
PGND
VCTL
15
14
13
12
GND
ICTL
CSSP
DCIN
REFIN
VCTL
ICTL
ACIN
ACOK
FROM HOST
μP
SHDN
ICHG
IINP
CCV
CCI
CCS
REF
CLS
CSSN
CELLS
LDO
LDO
BST
DLOV
21
DLOV
20 19
18
17
16
22
23
24
25
26
27
28
1
DCIN
2
LDO
3
CLS
4
REF
5
CCS
6
CCI
7
CCV
MAX8724
DHI
LX
DLO
10μH
PGND
CSIP
0.015Ω
CSIN
BATT
GND
LX
BST
DHI
CSSN
BATT
CSIN
CSIP
DLO
REFIN
ACOK
ACIN
MAX8724
11
10
9
8
CSSP
IINP
ICHG
SHDN
BATT+
THIN QFN
________________________________________________________________
Maxim Integrated Products
1
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.