Battery Charger. MAX8731 Datasheet

MAX8731 Charger. Datasheet pdf. Equivalent

Part MAX8731
Description SMBus Level 2 Battery Charger
Feature www.DataSheet4U.com 19-3923; Rev 0; 1/06 KIT ATION EVALU E L B A IL AVA SMBus Level 2 Battery Cha.
Manufacture Maxim Integrated Products
Datasheet
Download MAX8731 Datasheet



MAX8731
www.DataSheet4U.com
19-3923; Rev 0; 1/06
EVAALVUAAILTAIOBNLEKIT
SMBus Level 2 Battery Charger with
Remote Sense
General Description
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 10msense 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.
SMBus is a trademark of Intel Corp.
Applications
Notebook Computers
Tablet PCs
Medical Devices
Portable Equipment with Rechargeable Batteries
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
DCIN 22
LX 23
DHI 24
BST 25
VCC 26
CSSN 27
CSSP 28
MAX8731
*EXPOSED PADDLE
14 BATSEL
13 ACOK
12 GND
11 VDD
10 SCL
9 SDA
8 IINP
1 234567
THIN QFN
5mm x 5mm
Features
0.5% Battery Voltage Accuracy
3% Input Current-Limit Accuracy
3% Charge-Current Accuracy
SMBus 2-Wire Serial Interface
Cycle-by-Cycle Current Limit
Battery Short-Circuit Protection
Fast Response for Pulse Charging
Fast System-Load-Transient Response
Dual-Remote-Sense Inputs
Monitor Outputs for
Adapter Current (4% Accuracy)
AC Adapter Detection
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
Ordering Information
PART
TEMP RANGE
MAX8731ETI+ -40°C to +85°C
+Indicates lead-free packaging.
PIN-PACKAGE
28 Thin QFN (5mm x 5mm)
Typical Operating Circuit
OPTIONAL
HOST
SCL
SDA
VDD
CSSP
ACIN
DCIN
ACOK
CSSN
DHI
LX
MAX8731 DLO
REF PGND
BST
CSIP
GND CSIN
BATSEL
SCL
SDA
VDD
FBSA
FBSB
GND LDO
VCC
IINP CCV
DAC CCS CCI
EXTERNAL
LOAD
N
N
SELECTOR
BATSEL
BATTERY
A
BATTERY
B
________________________________________________________________ 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.



MAX8731
SMBus Level 2 Battery Charger with
Remote Sense
ABSOLUTE MAXIMUM RATINGS
DCIN, CSSN, CSIN, FBSA, FBSB to GND..............-0.3V to +28V
CSSP to CSSN, CSIP to CSIN, PGND to GND ......-0.3V to +0.3V
BST to GND ............................................................-0.3V to +32V
BST to LX..................................................................-0.3V to +6V
DHI to LX.................................................-0.3V to +(VBST + 0.3)V
DLO to PGND..........................................-0.3V to +(LDO + 0.3)V
LX to GND .................................................................-6V to +28V
CCI, CCS, CCV, DAC, REF,
IINP to GND...........................................-0.3V to (VVCC + 0.3)V
VDD, SCL, SDA, BATSEL, ACIN, ACOK, VCC to GND,
LDO to PGND ......................................................-0.3V to +6V
Continuous Power Dissipation (TA = +70°C)
28-Pin Thin QFN
(derate 20.8mW/°C above +70°C) ........................1666.7 mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDCIN = VLX = VCSSP = VCSSN = 19V, VBST - VLX = 4.5V, VFBSA = VFBSB = VCSIP = VCSIN = 16.8V, BATSEL = GND = PGND = 0,
CLDO = 1µF, VCC = LDO, CREF = 1µF, CDAC = 0.1µF, VDD = 3.3V, ACIN = 2.5V; pins CCI, CCV, and CCS are compensated per
Figure 1; TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CHARGE-VOLTAGE REGULATION
CONDITIONS
ChargingVoltage() = 0x41A0
Battery Full-Charge Voltage and
Accuracy
ChargingVoltage() = 0x3130
ChargingVoltage() = 0x20D0
ChargingVoltage() = 0x1060
Battery Undervoltage-Lockout
Trip Point for Trickle Charge
CHARGE-CURRENT REGULATION
CSIP to CSIN Full-Scale Current-
Sense Voltage
RS2 (Figure 1) = 10m;
ChargingCurrent() = 0x1f80
Charge Current and Accuracy
RS2 (Figure 1) = 10m;
ChargingCurrent() = 0x0f80
RS2 (Figure 1) = 10m;
ChargingCurrent() = 0x0080 (128mA)
Charge-Current Gain Error
Based on ChargeCurrent() = 128mA and 8.064A
FBSA/FBSB/CSIP/CSIN
Input Voltage Range
MIN TYP MAX UNITS
16.716
-0.5
12.491
-0.8
8.333
-0.8
4.15
-1.0
16.8
12.592
8.4
4.192
16.884
+0.5
12.693
+0.8
8.467
+0.8
4.234
+1.0
2.5
V
%
V
%
V
%
V
%
V
78.22 80.64 83.06
7.822
-3
3.809
-4
8.064
3.968
8.306
+3
4.126
+4
64 400
-2 +2
0 19
mV
A
%
A
%
mA
%
V
2 _______________________________________________________________________________________





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