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Maxim Integrated Products
Maxim Integrated Products

8731AE Datasheet

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8731AE Datasheet Preview


19-0756; Rev 0; 1/07
EVAALVUAAILTAIOBNLEKIT
SMBus Level 2 Battery Charger
with Remote Sense
General Description
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.
SMBus is a trademark of Intel Corp.
Applications
Notebook Computers
Tablet PCs
www.DataMSheedeitc4aUl.cDomevices
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
MAX8731A
*EXPOSED PADDLE
14 BATSEL
13 ACOK
12 GND
11 VDD
10 SCL
9 SDA
8 IINP
1 234567
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
PIN-
PACKAGE
PKG
CODE
MAX8731AETI+
-40°C to +85°C
28 Thin QFN
(5mm x 5mm)
T2855-6
+Indicates a lead-free package.
Typical Operating Circuit
OPTIONAL
HOST
SCL
SDA
VDD
CSSP
ACIN
DCIN
ACOK
CSSN
DHI
LX
MAX8731A 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
THIN QFN
5mm x 5mm
________________________________________________________________ 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.
Page 1

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
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Battery Undervoltage-Lockout
Trip Point for Trickle Charge
CHARGE-CURRENT REGULATION
CSIP-to-CSIN Full-Scale Current-
Sense Voltage
RS2, Figure 1 = 10mΩ;
ChargingCurrent() = 0x1f80
Charge Current and Accuracy
RS2, Figure 1 = 10mΩ;
ChargingCurrent() = 0x0f80
RS2, Figure 1 = 10mΩ;
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
4.150
-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 _______________________________________________________________________________________
Page 2

SMBus Level 2 Battery Charger
with Remote Sense
ELECTRICAL CHARACTERISTICS (continued)
(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
CONDITIONS
Battery Quiescent Current
Adapter present, not charging, ICSIP + ICSIN + ILX + IFBS,
VFBS_ = VLX = VCSIN = VCSIP = 19V
Adapter absent, ICSIP + ICSIN + ILX + IFBSA + IFBSB + ICSSP
+ ICSSN, VFBS_ = VLX = VCSIN = VCSIP = 19V, VDCIN = 0V
Adapter Quiescent Current
IDCIN +
ICSSP +
ICSSN
INPUT-CURRENT REGULATION
VAdapter = 26V, VBattery = 16.8V, not
charging
VAdapter = 19V,
VBattery = 16.8V
Charging
Not charging
VAdapter = 8V,
VBattery = 4V
Charging
Not charging
CSSP-to-CSSN Full-Scale
Current-Sense Voltage
VFBS_ = 19V
MIN
106.7
TYP
2
200
0.4
200
0.4
200
110
MAX UNITS
5
µA
+1
500 µA
1 mA
500 µA
1 mA
500 µA
113.3 mV
Input Current Accuracy
RS1, Figure 1 = 10mΩ, InputCurrent() = 11004mA or
3584mA
RS1, Figure 1 = 10mΩ, InputCurrent() = 2048mA
POR Input Current
RS1, Figure 1 = 10mΩ
Input Current-Limit Gain Error
Input Current-Limit Offset
Based on InputCurrent() = 1024mA and 11004mA
CSSP/CSSN Input Voltage Range
IINP Transconductance
VCSSP - CSSN = 110mV
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Based on VCSSP - CSSN = 110mV and 20mV
VCSSP - CSSN = 110mV
IINP Accuracy
VCSSP - CSSN = 55mV or 35mV
VCSSP - CSSN = 20mV
IINP Output Voltage Range
SUPPLY AND LINEAR REGULATOR
DCIN, Input Voltage Range
DCIN Undervoltage-Lockout
Trip Point
DCIN falling
DCIN rising
Power-Fail Threshold
VCSSP - VCSIN falling
VCSSP - VCSIN rising
-3 +3
%
-5 +5
256 mA
-2 +2 %
-1 +1 mV
8 26 V
2.85 3.0 3.15 mA/V
-1.5
+1.5
mV
-5 +5
-4 +4 %
-10 +10
0 3.5 V
8.0 26.0 V
7 7.4
V
7.5 7.85
9 15 21
160 210 271
mV
_______________________________________________________________________________________ 3
Page 3

SMBus Level 2 Battery Charger
with Remote Sense
ELECTRICAL CHARACTERISTICS (continued)
(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
LDO Output Voltage
LDO Load Regulation
LDO Undervoltage-Lockout Threshold
VDD Range
VDD UVLO Rising
VDD UVLO Hysteresis
VDD Quiescent Current
REFERENCE
REF Output Voltage
REF Undervoltage-Lockout Trip Point
ACOK
ACOK Sink Current
ACOK Leakage Current
ACIN
ACIN Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
REMOTE-SENSE INPUTS
FBS_ Range
FBS_ Gain
CSIN-FBS_ Clamp Voltage
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FBS_ Bias Current
SWITCHING REGULATOR
Off-Time
BST Supply Current
LX Input Bias Current
Maximum Discontinuous-Mode Peak
Current (IMIN)
DHI On-Resistance Low
DHI On-Resistance High
DLO On-Resistance High
DLO On-Resistance Low
CONDITIONS
8.0V < VDCIN < 28V, no load
0 < ILDO < 30mA
VDCIN = 8.0V, VLDO falling
DCIN < 6V, VDD = 5.5V, SCL = SDA = 5.5V
0 < IREF < 500µA
REF falling
VACOK = 0.4V, ACIN = 1.5V
VACOK = 5.5V, ACIN = 2.5V
VCSIN - VFBS
ΔVCSIN / Δ(VCSIN - VFBS_)
Charger switching, FBS_ selected
Charger not switching or FBS_ not selected
VCSIN = 16.0V, VCSSP = 19V
VCSIN = 16.0V, VCSSP = 17V
DHI high
VDCIN = 28V, VCSIN = VLX = 20V, DHI low
IDHI = -10mA
IDHI = 10mA
IDLO = 10mA
IDLO = -10mA
MIN
5.25
3.20
2.7
TYP
5.4
34
4.00
2.5
100
16
MAX
5.55
100
5.15
5.5
2.7
27
UNITS
V
mV
V
V
V
mV
µA
4.071
4.096
3.1
4.120
3.9
V
V
1 mA
1 µA
2.007
10
-1
2.048
20
2.089
30
+1
V
mV
µA
0 200
0.95 1.00 1.05
225 250 275
14
-2 +2
mV
V/V
mV
µA
µA
360 400 440
260 300 360
500 800
2
0.5
13
35
35
13
ns
µA
µA
A
Ω
Ω
Ω
Ω
4 _______________________________________________________________________________________
Page 4
Part Number 8731AE
Manufactur Maxim Integrated Products
Description Search -----> MAX8731A
Total Page 32 Pages
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