MAX8731A Maxim Integrated Products, MAX8731A Datasheet
MAX8731A
Manufacturer Part Number
MAX8731A
Description
SMBus Level 2 Battery Charger
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8731A.pdf
(32 pages)
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The MAX8731A is an SMBus™ programmable multi-
chemistry battery charger. The MAX8731A uses a mini-
mal command set to easily program the charge voltage,
charge current, and adapter current limit.
The MAX8731A charges one to four Li+ series cells and
delivers up to 8A charge current. The MAX8731A drives
n-channel MOSFETs for improved efficiency and
reduced cost. Low-offset current-sense amplifiers pro-
vide high accuracy with 10mΩ sense resistors.
The MAX8731A 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 MAX8731A provides 0.5%
battery voltage accuracy directly at the battery terminal.
The MAX8731A provides a digital output that indicates
the presence of the AC adapter, as well as an analog out-
put that indicates the adapter current within 4% accuracy.
The MAX8731A 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 MAX8731A is avail-
able in a lead-free package.
19-0756; Rev 0; 1/07
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
________________________________________________________________ Maxim Integrated Products
21
1
20
2
5mm x 5mm
*EXPOSED PADDLE
General Description
THIN QFN
19
MAX8731A
3
18
Pin Configuration
4
17
SMBus Level 2 Battery Charger
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 a lead-free package.
MAX8731AETI+
with Remote Sense
OPTIONAL
Battery Short-Circuit Protection
Fast Response for Pulse Charging
Fast System-Load-Transient Response
Adapter Current (4% Accuracy)
AC Adapter Detection
PART
HOST
SDA
VDD
SCL
Typical Operating Circuit
ACIN
DCIN
REF
GND
BATSEL
SCL
SDA
V
GND
IINP
CSSP
ACOK
DD
DAC CCS
-40°C to +85°C
TEMP RANGE
MAX8731A
Ordering Information
CSSN
CCI
PGND
FBSA
FBSB
CSIN
CCV
DLO
CSIP
LDO
BST
V
DHI
LX
CC
PIN-
PACKAGE
28 Thin QFN
(5mm x 5mm)
N
N
EXTERNAL LOAD
Features
SELECTOR
PKG
CODE
T2855-6
BATSEL
BATTERY
A
BATTERY
B
1
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