MAX1772 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Low-Cost, Multichemistry Battery- Charger Building Block

19-1772; Rev 2; 5/02
Low-Cost, Multichemistry Battery-
Charger Building Block
General Description
The MAX1772 is a highly-integrated, multichemistry
battery-charger control IC that simplifies the construc-
tion of accurate and efficient chargers. The MAX1772
uses analog inputs to control charge current and volt-
age and can be programmed by the host or hardwired.
High efficiency is achieved by a buck topology with
synchronous rectification.
Maximum current drawn from the AC adapter is pro-
grammable to avoid overloading the AC adapter when
supplying the load and the battery charger simultane-
ously. This enables the user to reduce the cost of the
AC adapter. The MAX1772 provides outputs that can
be used to monitor the current drawn from the AC
adapter, battery-charging current, and the presence of
an AC adapter.
The MAX1772 can charge two to four lithium-ion (Li+)
series cells, easily providing 4A. When charging, the
MAX1772 automatically transitions from regulating cur-
rent to regulating voltage. It is available in a space-sav-
ing 28-pin QSOP package.
Applications
Notebook and Subnotebook Computers
Personal Digital Assistants
Hand-Held Terminals
Features
o Input Current Limiting
o ±0.5% Output Voltage Accuracy Using Internal
Reference (0°C to +85°C)
o Programmable Battery Charge Current >4A
o Analog Inputs Control Charge Current and
Charge Voltage
o Monitor Outputs for:
Current Drawn from AC Input Source
Charging Current
AC Adapter Present
o Up to 18.2V (max) Battery Voltage
o 8V to 28V Input Voltage
o >95% Efficiency
o 99.99% (max) Duty Cycle for Low-Dropout
Operation
o Charges Any Battery Chemistry: Li+, NiCd, NiMH,
Lead Acid, etc.
Pin Configuration
TOP VIEW
DCIN 1
LDO 2
CLS 3
REF 4
CCS 5
CCI 6
CCV 7
GND 8
GND 9
ICHG 10
ACIN 11
ACOK 12
REFIN 13
ICTL 14
MAX1772
28 IINP
27 CSSP
26 CSSN
25 BST
24 DHI
23 LX
22 DLOV
21 DLO
20 PGND
19 CSIP
18 CSIN
17 BATT
16 CELLS
15 VCTL
PART
MAX1772EEI
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 QSOP
QSOP
________________________________________________________________ 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.