MAX8731 Maxim Integrated Products, MAX8731 Datasheet
MAX8731
Manufacturer Part Number
MAX8731
Description
SMBus Level 2 Battery Charger
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8731.pdf
(32 pages)
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The MAX8731 is an SMBus™ programmable multichem-
istry battery charger. The MAX8731 uses a minimal
command set to easily program the charge voltage,
charge current, and adapter current limit.
The MAX8731 charges one to four Li+ series cells and
delivers up to 8A charge current. The MAX8731 drives
n-channel MOSFETs for improved efficiency and
reduced cost. Low-offset current-sense amplifiers pro-
vide high accuracy with 10mΩ sense resistors.
The MAX8731 current-sense amplifiers provide high
accuracy (3% at 3.5A) and also provide fast cycle-by-
cycle current-mode control to protect against battery
short circuit and system load transients.
The charger employs dual remote-sense, which reduces
charge time by measuring the feedback voltage directly
at the battery, improving accuracy of initial transition into
constant-voltage mode. The MAX8731 provides 0.5%
battery voltage accuracy directly at the battery terminal.
The MAX8731 provides a digital output that indicates the
presence of the AC adapter, as well as an analog output
that indicates the adapter current within 4% accuracy.
The MAX8731 is available in a small 5mm x 5mm,
28-pin, thin (0.8mm) QFN package. An evaluation kit is
available to reduce design time. The MAX8731 is avail-
able in lead-free packages.
19-3923; Rev 0; 1/06
SMBus is a trademark of Intel Corp.
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.
Notebook Computers
Tablet PCs
Medical Devices
Portable Equipment with Rechargeable Batteries
TOP VIEW
CSSN
CSSP
DCIN
BST
V
DHI
LX
CC
22
23
24
25
26
27
28
SMBus Level 2 Battery Charger with
________________________________________________________________ Maxim Integrated Products
21
1
20
2
5mm x 5mm
*EXPOSED PADDLE
General Description
THIN QFN
19
3
MAX8731
18
4
Pin Configuration
17
5
16
6
Applications
15
7
14
13
12
11
10
9
8
BATSEL
ACOK
GND
V
SCL
SDA
IINP
DD
♦ 0.5% Battery Voltage Accuracy
♦ 3% Input Current-Limit Accuracy
♦ 3% Charge-Current Accuracy
♦ SMBus 2-Wire Serial Interface
♦ Cycle-by-Cycle Current Limit
♦ Dual-Remote-Sense Inputs
♦ Monitor Outputs for
♦ 11-Bit Battery Voltage Setting
♦ 6-Bit Charge-Current/Input-Current Setting
♦ 8A (max) Battery Charger Current
♦ 11A (max) Input Current
♦ +8V to +26V Input Voltage Range
♦ Charges Li+, NiMH, and NiCd Battery Chemistries
+Indicates lead-free packaging.
MAX8731ETI+
OPTIONAL
PART
Battery Short-Circuit Protection
Fast Response for Pulse Charging
Fast System-Load-Transient Response
Adapter Current (4% Accuracy)
AC Adapter Detection
HOST
SDA
VDD
SCL
Typical Operating Circuit
ACIN
DCIN
ACOK
REF
GND
BATSEL
SCL
SDA
V
GND
IINP
-40°C to +85°C
CSSP
Remote Sense
TEMP RANGE
DD
DAC CCS
MAX8731
Ordering Information
CSSN
CCI
PGND
FBSA
FBSB
CSIN
DLO
CSIP
LDO
CCV
BST
V
DHI
LX
CC
PIN-PACKAGE
28 Thin QFN (5mm x 5mm)
N
N
EXTERNAL
LOAD
Features
SELECTOR
BATSEL
BATTERY
A
BATTERY
B
1
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