MAX1908 Maxim Integrated Products, MAX1908 Datasheet
MAX1908
Manufacturer Part Number
MAX1908
Description
Low-Cost Multichemistry Battery Chargers
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1908.pdf
(30 pages)
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The MAX1908/MAX8724/MAX8765/MAX8765A highly
integrated, multichemistry battery-charger control ICs
simplify the construction of accurate and efficient charg-
ers. These devices use analog inputs to control charge
current and voltage, and can be programmed by the host
or hardwired. The MAX1908/MAX8724/MAX8765/
MAX8765A achieve high efficiency using a buck topology
with synchronous rectification.
The MAX1908/MAX8724/MAX8765/MAX8765A 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/MAX8765A provide out-
puts to monitor current drawn from the AC adapter (DC
input source), battery-charging current, and the pres-
ence 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/MAX8765A do not.
The MAX1908/MAX8724/MAX8765/MAX8765A charge two
to four series Li+ cells, providing more than 5A, and are
available in a space-saving, 28-pin, thin QFN package (5mm
× 5mm). An evaluation kit is available to speed designs.
19-2764; Rev 5; 11/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Notebook and Subnotebook Computers
Personal Digital Assistants
Handheld Terminals
AC ADAPTER
FROM HOST µP
INPUT
LDO
Low-Cost Multichemistry Battery Chargers
Minimum Operating Circuit
________________________________________________________________ Maxim Integrated Products
DCIN
REFIN
VCTL
ICTL
ACIN
ACOK
SHDN
ICHG
IINP
CCV
CCI
CCS
REF
CSSP
MAX8765A
MAX1908
MAX8724
MAX8765
CLS
General Description
0.01Ω
CSSN
GND
CELLS
PGND
DLOV
BATT
CSIP
CSIN
LDO
BST
DLO
DHI
LX
Applications
TO EXTERNAL
LOAD
BATT+
10µH
0.015Ω
o ±0.5% Output Voltage Accuracy Using Internal
o ±4% Accurate Input Current Limiting
o ±5% Accurate Charge Current
o Analog Inputs Control Charge Current and
o Outputs for Monitoring
o Up to 17.6V Battery-Voltage Set Point
o Maximum 28V Input Voltage
o > 95% Efficiency
o Shutdown Control Input
o Charge Any Battery Chemistry
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX1908ETI+
MAX8724ETI+
MAX8765ETI+
MAX8765AETI+
Reference (±0.4% for MAX8765A, 2-/3-Cell Only)
Charge Voltage
Current Drawn from AC Adapter
Charging Current
AC Adapter Presence
Li+, NiCd, NiMH, Lead Acid, etc.
PART
CSSN
TOP VIEW
DLOV
CSSP
BST
IINP
DHI
LX
22
23
24
25
26
27
28
+
21
1
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
20
2
Ordering Information
THIN QFN
19
MAX8765A
3
MAX1908
MAX8724
MAX8765
18
Pin Configuration
4
17
5
16
6
www.DataSheet4U.com
15
7
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
PIN-PACKAGE
14
13
12
11
10
9
8
Features
GND
ICTL
REFIN
ACOK
ACIN
ICHG
SHDN
1
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