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19-3498; Rev 0; 11/04
EVAALVUAAILTAIOBNLEKIT
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Simplified Multichemistry
SMBus Battery Charger
General Description
The MAX8713 multichemistry battery charger simplifies
construction of smart chargers with a minimum number
of external components. It uses the Intel System
Management Bus (SMBus™) to control the charge volt-
age and charge current. High efficiency is achieved
through the use of a constant off-time step-down topol-
ogy with synchronous rectification.
The MAX8713 charges one to four lithium-ion (Li+) cells
in series and delivers over 2A charge current—scalable
with the sense resistor. The MAX8713 drives n-channel
MOSFETs for improved efficiency and reduced cost. A
low-offset charge-current-sense amplifier provides high-
accuracy charge current with small sense resistors.
The MAX8713 is available in a space-saving 24-pin
4mm x 4mm thin QFN package and operates over the
extended (-40°C to +85°C) temperature range. An eval-
uation kit is available to reduce design time.
Applications
Handset Car Kits
Digital Cameras
PDAs and Tablet Computers
Notebook Computers
Portable Equipment with Rechargeable Batteries
Features
Over 2A Charge Current
Intel SMBus 2-Wire Serial Interface
±0.6% Charge Voltage Accuracy
11-Bit Charge Voltage Resolution
6-Bit Charge Current Resolution
Adjustable Switching Frequency
+8V to +28V Input Voltage Range
Cycle-By-Cycle Current Limit
Charges Any Battery Chemistry (Li+, NiCd, NiMH,
Lead Acid, etc.)
Small 24-Pin TQFN
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8713ETG -40°C to +85°C 24 Thin QFN 4mm x 4mm
Typical Operating Circuit
SMBus is a trademark of Intel Corp.
Pin Configuration
24 23 22 21 20 19
REF 1
IC1 2
CCI 3
CCV 4
DAC 5
VDD 6
MAX8713
*EXPOSED PADDLE
18 DLOV
17 DLO
16 PGND
15 CSIP
14 IC3
13 CSIN
7 8 9 10 11 12
THIN QFN
(4mm x 4mm)
OPTIONAL
HOST
SCL
SDA
VDD
DCIN DCSNS
REF
DHI
LX
DLO
MAX8713 BST
DAC CSIP
CSIN
BATT
SCL
SDA
VDD DLOV
LDO
FREQ
CCI
GND
PGND
CCV
EXTERNAL
LOAD
N
N
BATTERY
________________________________________________________________ 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.

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Simplified Multichemistry
SMBus Battery Charger
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ABSOLUTE MAXIMUM RATINGS
VDCSNS, VDCIN to GND ..........................................-0.3V to +30V
VBST to GND ..........................................................-0.3V to +36V
VBST to LX ................................................................-0.3V to +6V
VDHI to LX..................................................-0.3V to (VBST + 0.3V)
VLX to GND................................................................-6V to +30V
VDHI to GND ..............................................................-6V to +36V
VBATT, VCSIN to GND .............................................-0.3V to +20V
VCSIP to VCSIN .......................................................-0.3V to +0.3V
PGND to GND .......................................................-0.3V to +0.3V
VCCI, VCCV, VDAC, VREF to GND ..............-0.3V to (VLDO + 0.3V)
VDLOV, VLDO, VDD, VSCL, VSDA, VFREQ to GND ......-0.3V to +6V
VDLO to PGND ........................................-0.3V to (VDLOV + 0.3V)
LDO Short-Circuit Current...................................................25mA
Continuous Power Dissipation (TA = +70°C)
24-Pin Thin QFN 4mm x 4mm (derate 20.8mW/°C
above +70°C).............................................................1667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°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 = VDCSNS = 12V, VBATT = VCSIP = VCSIN = VBST = VLX = 8.4V, GND = PGND = 0, LDO = DLOV, CREF = CLDO = CDLOV = 1µF,
CDAC = 0.1µF , VDD = 3.3V. Pins CCI and CCV are compensated per Figure 1. TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
CHARGE VOLTAGE REGULATION
Battery Regulation Voltage Accuracy
ChargingVoltage() = 0x20D0
ChargingVoltage() = 0x1060
-0.6 +0.6
-1.0
+1.0
%
Battery Full Charge Voltage
CHARGE CURRENT REGULATION
ChargingVoltage() = 0x41A0 and 0x3130
ChargingVoltage() = 0x41A0, VDCIN = 19V
ChargingVoltage() = 0x3130, VDCIN = 19V
ChargingVoltage() = 0x20D0, VDCIN = 12V
ChargingVoltage() = 0x1060, VDCIN = 12V
-0.8 +0.8
16.668 16.8 16.934
12.491 12.592 12.693
8.439 8.4 8.442
4.150 4.192 4.234
V
CSIP to CSIN Full-Scale Current-Sense
Voltage
VBATT = 8.4V, VDCIN = 12V
78.22 80.64 88.05 mV
Compliance Current Accuracy
Battery Charge Current-Sense Voltage
ChargingCurrent() = 0x07e0
ChargingCurrent() = 0x03e0
ChargingCurrent() = 0x07e0
ChargingCurrent() = 0x03e0
ChargingCurrent() = 0x0180
-3
-5
78.22
37.68
13.82
80.64
39.68
15.36
+3
+5
83.05
41.68
16.88
%
mV
BATT/CSIP/CSIN Input Voltage Range
CSIP/CSIN Input Current
SUPPLY AND LINEAR REGULATOR
DCIN Input Voltage Range
DCSNS Input Voltage Range
ChargingCurrent() = 0x0020
VDCIN = 0 or charger not switching
VCSIP = VCSIN = 19V
1.28
0 19 V
0.1 1 µA
700 µA
7.5 28.0 V
7.5 28.0 V
2 _______________________________________________________________________________________

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Simplified Multichemistry
SMBus Battery Charger
ELECTRICAL CHARACTERISTICS (continued)
(VDCIN = VDCSNS = 12V, VBATT = VCSIP = VCSIN = VBST = VLX = 8.4V, GND = PGND = 0, LDO = DLOV, CREF = CLDO = CDLOV = 1µF,
CDAC = 0.1µF , VDD = 3.3V. Pins CCI and CCV are compensated per Figure 1. TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
PARAMETER
DCIN Undervoltage-Lockout Trip Point
DCIN Quiescent Current
DCSNS Quiescent Current
BATT Input Current
LDO Output Voltage
LDO Load Regulation
LDO Undervoltage-Lockout Trip Point
VDD Range
VDD UVLO Rising
VDD UVLO Hysteresis
VDD Quiescent Current
REFERENCE
REF Output Voltage
REF Undervoltage-Lockout Trip Point
TRIP POINTS
BATT POWER_FAIL Threshold
BATT POWER_FAIL Threshold Hysteresis
SWITCHING REGULATOR
Off-Time
DLOV Supply Current
BST Supply Current
BST Input Quiescent Current
LX Input Bias Current
Maximum Discontinuous-Mode Peak
Current
CONDITIONS
DCIN falling
DCIN rising
7.5V < VDCIN < 28V
7.5V < VDCSNS < 28V
VBATT = 19V, VDCIN = 0 or charger not switching
VBATT = 2V to 19V, VDCIN > VBATT + 0.3V
7.5V < VDCIN < 28V, no load
0 < ILDO < 5mA
VDCIN = 7.5V
MIN
6.5
5.25
3.20
2.7
VDCIN < 6V, VDD = 5.5V, VSCL = VSDA = 5.5V
0 < IREF < 500µA
REF falling
4.067
VDCSNS falling
50
50
VBST - VLX = 4.5V
VBATT = 8.4V
VBATT = 11V
RFREQ = 100k
RFREQ = 400k
RFREQ = 100k
RFREQ = 400k
Charger not switching
DHI high
VDCIN = 0V, VBST = 23.5V, VBATT = VLX = 19V
VDCIN = 28V, VBATT = VLX = 19V
675
2700
370
1476
TYP
7
7
2.7
200
0.1
200
5.4
34
4
2.5
100
4.096
3.1
100
200
750
3000
410
1640
5
6
0.3
150
0.125
MAX UNITS
7.5
6
300
1
500
5.55
100
5.15
5.5
2.7
27
V
mA
µA
µA
V
mV
V
V
V
mV
µA
4.125
3.9
V
V
150 mV
400 mV
825
3300
450
1804
10
15
1
500
ns
µA
µA
µA
µA
A
DHI On-Resistance High
VBST =12.9V, VBATT = 8.4V, VDCSNS = 12,
DHI = VLX; IDHI = -10mA
7 14
DHI On-Resistance Low
DLO On-Resistance High
DLO On-Resistance Low
ERROR AMPLIFIERS
GMV Amplifier Transconductance
VBST =12.9V, VBATT = 8.4V, VCSNS = 12,
DHI = VBST; IDHI = +100mA
VDLOV = 4.5V, IDLO = -10mA
VDLOV = 4.5V, IDLO = +100mA
ChargingVoltage() = 0x20d0, VBATT = 8.400V
24
7 14
24
0.0625 0.125 0.2500 mA/V
_______________________________________________________________________________________ 3

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Simplified Multichemistry
SMBus Battery Charger
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ELECTRICAL CHARACTERISTICS (continued)
(VDCIN = VDCSNS = 12V, VBATT = VCSIP = VCSIN = VBST = VLX = 8.4V, GND = PGND = 0, LDO = DLOV, CREF = CLDO = CDLOV = 1µF,
CDAC = 0.1µF , VDD = 3.3V. Pins CCI and CCV are compensated per Figure 1. TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
GMI Amplifier Transconductance
ChargingCurrent() = 0x03e0,
VCSIP - VCSIN = 39.68mV
CCI/CCV Clamp Voltage
0.25V < VCCV/I < 2.0V
SMBus INTERFACE LEVEL SPECIFICATIONS
SDA/SCL Input Low Voltage
VDD = 2.7V to 5.5V
SDA/SCL Input High Voltage
VDD = 2.7V to 5.5V
SDA/SCL Input Bias Current
VDD = 2.7V to 5.5V
SDA, Output Sink Current
V(SDA) = 0.4V
0.5 1 2.0 mA/V
150 300 600 mV
0.8 V
2.1 V
-1 +1 µA
6 mA
TIMING CHARACTERISTICS
(VDCIN = VDCSNS = 12V, VBATT = VCSIP = VCSIN = VBST = VLX = 8.4V, GND = PGND = 0, LDO = DLOV, CREF = CLDO = CDLOV = 1µF,
CDAC = 0.1µF , VDD = 3.3V. Pins CCI and CCV are compensated per Figure 1. TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SMBus TIMING SPECIFICATION (VDD = 2.7V TO 5.5V) (Figures 6 and 7)
SMBus Frequency
fSMB
Bus Free Time
tBUF
Start Condition Hold Time from SCL
tHD:STA
Start Condition Setup Time from SCL tSU:STA
Stop Condition Setup Time from SCL tSU:STO
SDA Hold Time from SCL
tHD:DAT
SDA Setup Time from SCL
tSU:DAT
SCL Low Timeout
tTIMEOUT (Note 1)
SCL Low Period
tLOW
SCL High Period
tHIGH
Cumulative Clock Low Extend Time
tLOW:SEXT (Note 2)
10 100 kHz
4.7 µs
4 µs
4.7 µs
4 µs
300 ns
250 ns
25 35 ms
4.7 µs
4 µs
25 ms
4 _______________________________________________________________________________________

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Simplified Multichemistry
SMBus Battery Charger
ELECTRICAL CHARACTERISTICS
(VDCIN = VDCSNS = 12V, VBATT = VCSIP = VCSIN = VBST = VLX = 8.4V, GND = PGND = 0, LDO = DLOV, CREF = CLDO = CDLOV = 1µF,
CDAC = 0.1µF , VDD = 3.3V. Pins CCI and CCV are compensated per Figure 1. TA = -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
CHARGE VOLTAGE REGULATION
ChargingVoltage() = 0x20D0
-1.0 +1.0
Battery Regulation Voltage Accuracy
ChargingVoltage() = 0x1060
-1.5
+1.5
%
ChargingVoltage() = 0x41A0 and 0x3130
-1.2
+1.2
Battery Full Charge Voltage
CHARGE CURRENT REGULATION
ChargingVoltage() = 0x41A0, VDCIN = 19V
ChargingVoltage() = 0x3130, VDCIN = 19V
ChargingVoltage() = 0x20D0, VDCIN = 12V
ChargingVoltage() = 0x1060, VDCIN = 12V
16.598
12.441
8.312
4.124
17.002
12.743
8.484
4.253
V
CSIP to CSIN Full-Scale Current-Sense
Voltage
VBATT = 8.4V, VDCIN = 12V
78.22
83.05 mV
Compliance Current Accuracy
ChargingCurrent() = 0x07e0
ChargingCurrent() = 0x03e0
-3 +3
%
-5 +5
ChargingCurrent() = 0x07e0
78.22
83.05
Battery Charge Current-Sense Voltage
ChargingCurrent() = 0x03e0
37.68
41.68 mV
ChargingCurrent() = 0x0180
13.056
17.664
BATT/CSIP/CSIN Input Voltage Range
0 19 V
CSIP/CSIN Input Current
SUPPLY AND LINEAR REGULATOR
VDCIN = 0 or charger not switching
VCSIP = VCSIN = 19V
1 µA
700 µA
DCIN Input Voltage Range
7.5 28.0 V
DCSNS Input Voltage Range
7.5 28.0 V
DCIN Undervoltage-Lockout Trip Point
DCIN falling
DCIN rising
6.5
V
7.5
DCIN Quiescent Current
DCSNS Quiescent Current
BATT Input Current
LDO Output Voltage
LDO Load Regulation
LDO Undervoltage-Lockout Trip Point
VDD Range
7.5V < VDCIN < 28V
7.5V < VDCSNS < 28V
VBATT = 19V, VDCIN = 0 or charger not switching
VBATT = 2V to 19V, VDCIN > VBATT + 0.3V
7.5V < VDCIN < 28V, no load
0 < ILDO < 5mA
VDCIN = 7.5V
5.25
3.20
2.7
6 mA
300 µA
1
µA
500
5.55 V
100 mV
5.15 V
5.5 V
VDD UVLO Rising
2.7 V
VDD Quiescent Current
REFERENCE
VDCIN < 6V, VDD = 5.5V, VSCL = VSDA = 5.5V
27 µA
REF Output Voltage
REF Undervoltage-Lockout Trip Point
0 < IREF < 500µA
REF falling
4.053
4.133
3.9
V
V
_______________________________________________________________________________________ 5