19-3498; Rev 0; 11/04
KIT
ATION
EVALU
BLE
AVAILA
Simplified Multichemistry
SMBus Battery Charger
General Description
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
MAX8713
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
PART
MAX8713ETG
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
24 Thin QFN 4mm x 4mm
Typical Operating Circuit
EXTERNAL
LOAD
OPTIONAL
SMBus is a trademark of Intel Corp.
Pin Configuration
DCSNS
DCIN
LDO
BST
DHI
LX
DCIN DCSNS
DHI
LX
N
REF
19
DAC
18
17
DLOV
DLO
PGND
CSIP
IC3
CSIN
FREQ
HOST
SCL
SDA
V
DD
SCL
SDA
V
DD
DLO
N
24
REF
IC1
CCI
CCV
DAC
V
DD
1
2
3
4
5
6
23
22
21
20
MAX8713
BST
CSIP
CSIN
BATT
BATTERY
MAX8713
16
15
14
DLOV
LDO
GND
PGND
CCI
CCV
*EXPOSED PADDLE
7
SDA
8
SCL
9
IC2
10
FREQ
11
GND
12
BATT
13
THIN QFN
(4mm x 4mm)
________________________________________________________________
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.
Simplified Multichemistry
SMBus Battery Charger
MAX8713
ABSOLUTE MAXIMUM RATINGS
V
DCSNS
, V
DCIN
to GND ..........................................-0.3V to +30V
V
BST
to GND ..........................................................-0.3V to +36V
V
BST
to LX ................................................................-0.3V to +6V
V
DHI
to LX..................................................-0.3V to (V
BST
+ 0.3V)
V
LX
to GND................................................................-6V to +30V
V
DHI
to GND ..............................................................-6V to +36V
V
BATT
, V
CSIN
to GND .............................................-0.3V to +20V
V
CSIP
to V
CSIN
.......................................................-0.3V to +0.3V
PGND to GND .......................................................-0.3V to +0.3V
V
CCI
, V
CCV
, V
DAC
, V
REF
to GND ..............-0.3V to (V
LDO
+ 0.3V)
V
DLOV
, V
LDO
, V
DD
, V
SCL
, V
SDA
, V
FREQ
to GND ......-0.3V to +6V
V
DLO
to PGND ........................................-0.3V to (V
DLOV
+ 0.3V)
LDO Short-Circuit Current...................................................25mA
Continuous Power Dissipation (T
A
= +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
(V
DCIN
= V
DCSNS
= 12V, V
BATT
= V
CSIP
= V
CSIN
= V
BST
= V
LX
= 8.4V, GND = PGND = 0, LDO = DLOV, C
REF
= C
LDO
= C
DLOV
= 1µF,
C
DAC
= 0.1µF , V
DD
= 3.3V. Pins CCI and CCV are compensated per Figure 1.
T
A
= 0°C to +85°C,
unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
CHARGE VOLTAGE REGULATION
ChargingVoltage() = 0x20D0
Battery Regulation Voltage Accuracy
ChargingVoltage() = 0x1060
ChargingVoltage() = 0x41A0 and 0x3130
ChargingVoltage() = 0x41A0, V
DCIN
= 19V
Battery Full Charge Voltage
ChargingVoltage() = 0x3130, V
DCIN
= 19V
ChargingVoltage() = 0x20D0, V
DCIN
= 12V
ChargingVoltage() = 0x1060, V
DCIN
= 12V
CHARGE CURRENT REGULATION
CSIP to CSIN Full-Scale Current-Sense
Voltage
Compliance Current Accuracy
V
BATT
= 8.4V, V
DCIN
= 12V
ChargingCurrent() = 0x07e0
ChargingCurrent() = 0x03e0
ChargingCurrent() = 0x07e0
Battery Charge Current-Sense Voltage
ChargingCurrent() = 0x03e0
ChargingCurrent() = 0x0180
ChargingCurrent() = 0x0020
BATT/CSIP/CSIN Input Voltage Range
CSIP/CSIN Input Current
SUPPLY AND LINEAR REGULATOR
DCIN Input Voltage Range
DCSNS Input Voltage Range
7.5
7.5
28.0
28.0
V
V
V
DCIN
= 0 or charger not switching
V
CSIP
= V
CSIN
= 19V
0
0.1
78.22
-3
-5
78.22
37.68
13.82
80.64
39.68
15.36
1.28
19
1
700
V
µA
µA
80.64
88.05
+3
+5
83.05
41.68
16.88
mV
mV
%
-0.6
-1.0
-0.8
16.668
12.491
8.439
4.150
16.8
8.4
4.192
+0.6
+1.0
+0.8
16.934
8.442
4.234
V
12.592 12.693
%
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Simplified Multichemistry
SMBus Battery Charger
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
DCSNS
= 12V, V
BATT
= V
CSIP
= V
CSIN
= V
BST
= V
LX
= 8.4V, GND = PGND = 0, LDO = DLOV, C
REF
= C
LDO
= C
DLOV
= 1µF,
C
DAC
= 0.1µF , V
DD
= 3.3V. Pins CCI and CCV are compensated per Figure 1.
T
A
= 0°C to +85°C,
unless otherwise noted. Typical
values are at T
A
= +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
V
BATT
= 8.4V
Off-Time
V
BST
- V
LX
= 4.5V
V
BATT
= 11V
DLOV Supply Current
BST Supply Current
BST Input Quiescent Current
LX Input Bias Current
Maximum Discontinuous-Mode Peak
Current
DHI On-Resistance High
DHI On-Resistance Low
DLO On-Resistance High
DLO On-Resistance Low
ERROR AMPLIFIERS
GMV Amplifier Transconductance
ChargingVoltage() = 0x20d0, V
BATT
= 8.400V
0.0625
0.125
0.2500
mA/V
V
BST
=12.9V, V
BATT
= 8.4V, V
DCSNS
= 12,
DHI = V
LX
; I
DHI
= -10mA
V
BST
=12.9V, V
BATT
= 8.4V, V
CSNS
= 12,
DHI = V
BST
; I
DHI
= +100mA
V
DLOV
= 4.5V, I
DLO
= -10mA
V
DLOV
= 4.5V, I
DLO
= +100mA
Charger not switching
DHI high
V
DCIN
= 0V, V
BST
= 23.5V, V
BATT
= V
LX
= 19V
V
DCIN
= 28V, V
BATT
= V
LX
= 19V
R
FREQ
= 100kΩ
R
FREQ
= 400kΩ
R
FREQ
= 100kΩ
R
FREQ
= 400kΩ
675
2700
370
1476
750
3000
410
1640
5
6
0.3
150
0.125
7
2
7
2
14
4
14
4
825
3300
450
1804
10
15
1
500
µA
µA
µA
µA
A
Ω
Ω
Ω
Ω
ns
V
DCSNS
falling
50
50
100
200
150
400
mV
mV
0 < I
REF
< 500µA
REF falling
4.067
4.096
3.1
4.125
3.9
V
V
V
DCIN
< 6V, V
DD
= 5.5V, V
SCL
= V
SDA
= 5.5V
DCIN falling
DCIN rising
7.5V < V
DCIN
< 28V
7.5V < V
DCSNS
< 28V
V
BATT
= 19V, V
DCIN
= 0 or charger not switching
V
BATT
= 2V to 19V, V
DCIN
> V
BATT
+ 0.3V
7.5V < V
DCIN
< 28V, no load
0 < I
LDO
< 5mA
V
DCIN
= 7.5V
3.20
2.7
2.5
100
27
5.25
CONDITIONS
MIN
6.5
TYP
7
7
2.7
200
0.1
200
5.4
34
4
7.5
6
300
1
500
5.55
100
5.15
5.5
2.7
MAX
UNITS
V
mA
µA
µA
V
mV
V
V
V
mV
µA
MAX8713
_______________________________________________________________________________________
3
Simplified Multichemistry
SMBus Battery Charger
MAX8713
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
DCSNS
= 12V, V
BATT
= V
CSIP
= V
CSIN
= V
BST
= V
LX
= 8.4V, GND = PGND = 0, LDO = DLOV, C
REF
= C
LDO
= C
DLOV
= 1µF,
C
DAC
= 0.1µF , V
DD
= 3.3V. Pins CCI and CCV are compensated per Figure 1.
T
A
= 0°C to +85°C,
unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
GMI Amplifier Transconductance
CCI/CCV Clamp Voltage
SDA/SCL Input Low Voltage
SDA/SCL Input High Voltage
SDA/SCL Input Bias Current
SDA, Output Sink Current
CONDITIONS
ChargingCurrent() = 0x03e0,
V
CSIP
- V
CSIN
= 39.68mV
0.25V < V
CCV/I
< 2.0V
V
DD
= 2.7V to 5.5V
V
DD
= 2.7V to 5.5V
V
DD
= 2.7V to 5.5V
V
(SDA)
= 0.4V
2.1
-1
6
+1
MIN
0.5
150
TYP
1
300
MAX
2.0
600
0.8
UNITS
mA/V
mV
V
V
µA
mA
SMBus INTERFACE LEVEL SPECIFICATIONS
TIMING CHARACTERISTICS
(V
DCIN
= V
DCSNS
= 12V, V
BATT
= V
CSIP
= V
CSIN
= V
BST
= V
LX
= 8.4V, GND = PGND = 0, LDO = DLOV, C
REF
= C
LDO
= C
DLOV
= 1µF,
C
DAC
= 0.1µF , V
DD
= 3.3V. Pins CCI and CCV are compensated per Figure 1.
T
A
= 0°C to +85°C,
unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
SMBus Frequency
Bus Free Time
Start Condition Hold Time from SCL
Start Condition Setup Time from SCL
Stop Condition Setup Time from SCL
SDA Hold Time from SCL
SDA Setup Time from SCL
SCL Low Timeout
SCL Low Period
SCL High Period
Cumulative Clock Low Extend Time
SYMBOL
f
SMB
t
BUF
t
HD:STA
t
SU:STA
t
SU:STO
t
HD:DAT
t
SU:DAT
t
TIMEOUT
t
LOW
t
HIGH
t
LOW:SEXT
(Note 2)
(Note 1)
CONDITIONS
MIN
10
4.7
4
4.7
4
300
250
25
4.7
4
25
35
TYP
MAX
100
UNITS
kHz
µs
µs
µs
µs
ns
ns
ms
µs
µs
ms
SMBus TIMING SPECIFICATION (V
DD
= 2.7V TO 5.5V) (Figures 6 and 7)
4
_______________________________________________________________________________________
Simplified Multichemistry
SMBus Battery Charger
ELECTRICAL CHARACTERISTICS
(V
DCIN
= V
DCSNS
= 12V, V
BATT
= V
CSIP
= V
CSIN
= V
BST
= V
LX
= 8.4V, GND = PGND = 0, LDO = DLOV, C
REF
= C
LDO
= C
DLOV
= 1µF,
C
DAC
= 0.1µF , V
DD
= 3.3V. Pins CCI and CCV are compensated per Figure 1.
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 3)
PARAMETER
CHARGE VOLTAGE REGULATION
ChargingVoltage() = 0x20D0
Battery Regulation Voltage Accuracy
ChargingVoltage() = 0x1060
ChargingVoltage() = 0x41A0 and 0x3130
ChargingVoltage() = 0x41A0, V
DCIN
= 19V
Battery Full Charge Voltage
ChargingVoltage() = 0x3130, V
DCIN
= 19V
ChargingVoltage() = 0x20D0, V
DCIN
= 12V
ChargingVoltage() = 0x1060, V
DCIN
= 12V
CHARGE CURRENT REGULATION
CSIP to CSIN Full-Scale Current-Sense
Voltage
Compliance Current Accuracy
V
BATT
= 8.4V, V
DCIN
= 12V
ChargingCurrent() = 0x07e0
ChargingCurrent() = 0x03e0
ChargingCurrent() = 0x07e0
Battery Charge Current-Sense Voltage
BATT/CSIP/CSIN Input Voltage Range
CSIP/CSIN Input Current
SUPPLY AND LINEAR REGULATOR
DCIN Input Voltage Range
DCSNS Input Voltage Range
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 Quiescent Current
REFERENCE
REF Output Voltage
REF Undervoltage-Lockout Trip Point
0 < I
REF
< 500µA
REF falling
4.053
4.133
3.9
V
V
V
DCIN
< 6V, V
DD
= 5.5V, V
SCL
= V
SDA
= 5.5V
DCIN falling
DCIN rising
7.5V < V
DCIN
< 28V
7.5V < V
DCSNS
< 28V
V
BATT
= 19V, V
DCIN
= 0 or charger not switching
V
BATT
= 2V to 19V, V
DCIN
> V
BATT
+ 0.3V
7.5V < V
DCIN
< 28V, no load
0 < I
LDO
< 5mA
V
DCIN
= 7.5V
3.20
2.7
5.25
7.5
7.5
6.5
7.5
6
300
1
500
5.55
100
5.15
5.5
2.7
27
28.0
28.0
V
V
V
mA
µA
µA
V
mV
V
V
V
µA
V
DCIN
= 0 or charger not switching
V
CSIP
= V
CSIN
= 19V
ChargingCurrent() = 0x03e0
ChargingCurrent() = 0x0180
78.22
-3
-5
78.22
37.68
13.056
0
83.05
+3
+5
83.05
41.68
17.664
19
1
700
V
µA
µA
mV
mV
%
-1.0
-1.5
-1.2
16.598
12.441
8.312
4.124
+1.0
+1.5
+1.2
17.002
12.743
8.484
4.253
V
%
CONDITIONS
MIN
TYP
MAX
UNITS
MAX8713
_______________________________________________________________________________________
5
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