MAX1645-MAX1645A Maxim, MAX1645-MAX1645A Datasheet
MAX1645-MAX1645A
Manufacturer Part Number
MAX1645-MAX1645A
Description
Advanced Chemistry-Independent / Level 2 Battery Chargers with Input Current Limiting
Manufacturer
Maxim
Datasheet
1.MAX1645-MAX1645A.pdf
(32 pages)
The MAX1645 are high-efficiency battery chargers capa-
ble of charging batteries of any chemistry type. It uses the
Intel System Management Bus (SMBus) to control volt-
age and current charge outputs.
When charging lithium-ion (Li+) batteries, the MAX1645
automatically transition from regulating current to regu-
lating voltage. The MAX1645 can also limit line input
current so as not to exceed a predetermined current
drawn from the DC source. A 175s charge safety timer
prevents “runaway charging” should the MAX1645 stop
receiving charging voltage/ current commands.
The MAX1645 employs a next-generation synchronous
buck control circuity that lowers the minimum input-to-
output voltage drop by allowing the duty cycle to
exceed 99%. The MAX1645 can easily charge one to
four series Li+ cells.
19-1566; Rev 2; 1/01
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.
TOP VIEW
Notebook Computers
Point-of-Sale Terminals
Personal Digital Assistants
Battery Chargers with Input Current Limiting
Advanced Chemistry-Independent, Level 2
DCIN
BATT
THM
CCS
CCV
GND
DAC
LDO
SDA
CLS
V
SCL
REF
CCI
DD
________________________________________________________________ Maxim Integrated Products
10
11
12
13
14
1
2
3
4
5
6
7
8
9
General Description
MAX1645A
MAX1645
QSOP
Pin Configuration
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Applications
CVS
PDS
CSSP
CSSN
BST
DHI
LX
DLOV
DLO
PGND
CSIP
CSIN
PDL
INT
o Input Current Limiting
o 175s Charge Safety Timeout
o 128mA Wake-Up Charge
o Charges Any Chemistry Battery: Li+, NiCd,
o Intel SMBus 2-Wire Serial Interface
o Compliant with Level 2 Smart Battery Charger
o +8V to +28V Input Voltage Range
o Up to 18.4V Battery Voltage
o 11-Bit Battery Voltage Setting
o ±0.8% Output Voltage Accuracy with Internal
o 3A max Battery Charge Current
o 6-Bit Charge Current Setting
o 99.99% max Duty Cycle for Low-Dropout Operation
o Load/Source Switchover Drivers
o >97% Efficiency
Typical Operating Circuit appears at end of data sheet.
SMBus is a trademark of Intel Corp.
MAX1645EEI
MAX1645AEEI
NiMH, Lead Acid, etc.
Spec Rev. 1.0
Reference
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
Ordering Information
PIN-PACKAGE
28 QSOP
28 QSOP
Features
1
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