DATASHEET
ISL88731
SMBus Level 2 Battery Charger
The ISL88731 is a highly integrated Lithium-ion battery charger
controller, programmable over the SMBus system management
bus (SMBus). The ISL88731 is intended to be used in a smart
battery charger (SBC) within a smart battery system (SBS) that
throttles the charge power such that the current from the
AC-adapter is automatically limited. High efficiency is achieved
with a DC/DC synchronous-rectifier buck converter, equipped
with diode emulation for enhanced light load efficiency and
system bus boosting prevention. The ISL88731 charges one to
four Lithium-ion series cells, and delivers up to 8A charge
current. Integrated MOSFET drivers and bootstrap diode result
in fewer components and smaller implementation area. Low
offset current-sense amplifiers provide high accuracy with
10m sense resistors. The ISL88731 provides 0.5%
end-of-charge battery voltage accuracy.
The ISL88731 provides a digital output that indicates the
presence of the AC adapter as well as an analog output which
indicates the adapter current within 4% accuracy.
The ISL88731 is available in a small 5mmx5mm 28 Ld Thin
(0.8mm) QFN package. An evaluation kit is available to reduce
design time. The ISL88731 is available in Pb-Free packages.
FN9258
Rev 3.00
June 8, 2011
Features
• 0.5% Battery Voltage Accuracy
• 3% Adapter Current Limit Accuracy
• 3% Charge Current Accuracy
• SMBus 2-Wire Serial Interface
• Battery Short Circuit Protection
• Fast Response for Pulse-Charging
• Fast System-Load Transient Response
• Monitor Outputs
- Adapter Current (3% Accuracy)
- AC-Adapter Detection
• 11-Bit Battery Voltage Setting
• 6 Bit Charge Current/Adapter Current Setting
• 8A Maximum Battery Charger Current
• 11A Maximum Adapter Current
• +8V to +28V Adapter Voltage Range
• Pb-Free (RoHS Compliant)
Pin Configuration
ISL88731
(28 LD TQFN)
TOP VIEW
PHASE
UGATE
BOOT
CSSN
CSSP
DCIN
VCC
Applications
• Notebook Computers
• Tablet PCs
• Portable Equipment with Rechargeable Batteries
28
NC
ACIN
VREF
ICOMP
NC
VCOMP
NC
1
2
3
4
5
6
7
8
ICM
27
26
25
24
23
22
21
20
19
18
17
16
15
VDDP
LGATE
PGND
CSOP
CSON
NC
VFB
Ordering Information
PART
NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP
RANGE (°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
L28.5x5B
ISL88731HRZ ISL887 31HRZ -10 to +100 28 Ld 5x5 TQFN
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to
TB347
for details on reel
specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free
material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS
compliant and compatible with both SnPb and Pb-free soldering
operations). Intersil Pb-free products are MSL classified at Pb-free peak
reflow temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page
for
ISL88731.
For more information on MSL please see techbrief
TB363.
9
SDA
10
SCL
11
VDDSMB
12
GND
13
ACOK
14
NC
FN9258 Rev 3.00
June 8, 2011
Page 1 of 22
ISL88731
DCIN
VCC
VDDSMB
SDA
SCL
SMBUS
11
6
6
DACV
DACS
DACI
EN
DACV
DACS
DACI
LINEAR
REGULATOR
VDDP
REFERENCE
VREF
REF
+
-
ACOK
ACIN
BUFF
ICM
EN
BOOT
CSSP
CSSN
ICOMP
CSOP
CSON
LEVEL
SHIFTER
20x
-
DACS
GMS
+
CSO
LEVEL
SHIFTER
20x
-
DACI
UGATE
GMI
LVB
DACV
LVB
DC-DC
CONVERTER
+
+
-
GMV
PHASE
VDDP
LGATE
PGND
VFB
500k
100k
EN
CSSP
GND
VCOMP
FIGURE 1. FUNCTIONAL BLOCK DIAGRAM
AC ADAPTER
RS1
TO SYSTEM
CSSP
ACIN
DCIN
CSSN
UGATE
PHASE
RS2
TO BATTERY
ISL88731
BOOT
LGATE
AGND
ICOMP
VCOMP
VDDP
VREF
CSOP
CSON
VFB
PGND
VCC
GND
ACOK
ICM
SDA
SCL
VDDSMB
PGND
HOST
AGND
FIGURE 2. TYPICAL APPLICATION CIRCUIT
FN9258 Rev 3.00
June 8, 2011
Page 2 of 22
ISL88731
Absolute Maximum Ratings
DCIN, CSSP, CSSN, CSOP, CSON, VFB . . . . . . . . . . . . . . . . . . . -0.3V to +28V
CSSP-CSSN, CSOP-CSON, PGND-GND . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
PHASE to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6V to +30V
BOOT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +33V
BOOT to PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
UGATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PHASE - 0.3V to BOOT + 0.3V
LGATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PGND - 0.3V to VDDP + 0.3V
ICOMP, VCOMP, VREF, to GND . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC + 0.3V
VDDSMB, SCL, SDA, ACIN, ACOK . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
VDDP, ICM, VCC to GND, VDDP to PGND . . . . . . . . . . . . . . . . . . -0.3V to +6V
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
28 Ld TQFN Package (Notes 4, 5) . . . . . . .
36
6
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . . -55C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . -10C to +100°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief
TB379.
5. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER
DCIN = CSSP = CSSN = 18V, CSOP = CSON = 12V, VDDP = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V,
CVDDP = 1µF, IVDDP = 0mA, T
A
= -10°C to +100°C. Boldface limits apply over the operating temperature range, -10°C to +100°C.
CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 6) UNITS
CHARGE VOLTAGE REGULATION
Battery Full Charge Voltage and Accuracy
ChargeVoltage = 0x41A0
16.716
-0.5
ChargeVoltage = 0x3130
16.8
16.884
0.5
V
%
V
%
V
%
V
%
V
mV
12.529 12.592 12.655
-0.5
0.5
8.4
8.450
0.6
4.192
4.221
0.7
2.7
250
2.85
400
ChargeVoltage = 0x20D0
8.350
-0.6
ChargeVoltage = 0x1060
4.163
-0.7
Battery Undervoltage Lockout Trip Point for Trickle
Charge
Battery Undervoltage Lockout Trip Point Hysteresis
VFB rising
2.55
100
CHARGE CURRENT REGULATION
CSOP to CSON Full-Scale Current-Sense Voltage
Charge Current and Accuracy
RS2 = 10m (see Figure 2)
ChargingCurrent = 0x1f80
RS2 = 10m (see Figure 2)
ChargingCurrent = 0x0f80
RS2 = 10m (see Figure 2)
ChargingCurrent = 0x0080
Charge Current Gain Error
CSOP/CSON Input Voltage Range
Battery Quiescent Current
Adapter present, not charging,
I
CSOP
+ I
CSON
+ I
PHASE
+ I
CSSP
+ I
CSSN
+ I
FB
V
PHASE
= V
CSON
= V
CSOP
= V
DCIN
= 19V, V
ACIN
= 5V
Adapter Absent
I
CSOP
+ I
CSON
+ I
PHASE
+ I
CSSP
+ I
CSSN
+ I
FB
V
PHASE
= V
CSON
= V
CSOP
= 19V, V
DCIN
= 0V
-1
Based on charge current = 128mA and 8.064A
78.22
7.822
-3
3.809
-4
64
-1.6
0
135
128
3.968
80.64
8.064
83.06
8.306
3
4.126
4
220
1.4
19
200
mV
A
%
A
%
mA
%
V
µA
0.2
2
µA
FN9258 Rev 3.00
June 8, 2011
Page 3 of 22
ISL88731
Electrical Specifications
PARAMETER
Adapter Quiescent Current
DCIN = CSSP = CSSN = 18V, CSOP = CSON = 12V, VDDP = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V,
CVDDP = 1µF, IVDDP = 0mA, T
A
= -10°C to +100°C. Boldface limits apply over the operating temperature range, -10°C to +100°C.
(Continued)
CONDITIONS
I
DCIN
+ I
CSSP
+ I
CSSN
Vadapter = 8V to 26V, Vbattery 4V to 16.8V
MIN
(Note 6)
TYP
3
MAX
(Note 6) UNITS
5
mA
INPUT CURRENT REGULATION
CSSP to CSSN Full-Scale Current-Sense Voltage
Input Current Accuracy
CSSP = 19V
RS1 = 10m (see Figure 2)
Adapter Current = 11004mA or 3584mA
RS1 = 10m (see Figure 2)
Adapter Current = 2048mA
Input Current Limit Gain Error
Input Current Limit Offset
CSSP/CSSN Input Voltage Range
ICM Gain
ICM Accuracy
V
CSSP-CSSN
= 110mV
V
CSSP-CSSN
= 110mV
V
CSSP-CSSN
= 55mV or 35mV
V
CSSP-CSSN
= 20mV
ICM Max Output Current
V
CSSP-CSSN
= 0.1V
-2.5
-4
-8
Based on InputCurrent = 1024mA and 11004mA
106.7
-3
-5
-1.5
-1
8
20
2.5
4
8
500
110
113.3
3
5
1.5
1
26
mV
%
%
%
mV
V
V/V
%
%
%
µA
SUPPLY AND LINEAR REGULATOR
DCIN, Input Voltage Range
VDDP Output Voltage
VDDP Load Regulation
VDDSMB Range
VDDSMB UVLO Rising
VDDSMB UVLO Hysteresis
VDDSMB Quiescent Current
VDDP = SCL = SDA = 5.5V
8.0V < V
DCIN
< 28V, no load
0 < I
VDDP
< 30mA
2.7
2.4
40
2.5
100
20
8
5.0
5.1
35
26
5.23
100
5.5
2.6
150
27
V
V
mV
V
V
mV
µA
V REFERENCE
VREF Output Voltage
0 < I
VREF
< 300µA
3.168
3.2
3.232
V
ACOK
ACOK Sink Current
ACOK Leakage Current
V
ACOK
= 0.4V, ACIN = 1.5V
V
ACOK
= 5.5V, ACIN = 3.7V
2
8
1
mA
µA
ACIN
ACIN rising Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
3.15
40
-1
3.2
60
3.25
90
1
V
mV
µA
SWITCHING REGULATOR
Frequency
BOOT Supply Current
PHASE Input Bias Current
UGATE On-Resistance Low
UGATE On-Resistance High
LGATE On-Resistance High
LGATE On-Resistance Low
UGATE High
V
DCON
= 28V, V
CSON
= V
PHASE
= 20V
I
UGATE
= -100mA
I
UGATE
= 10mA
I
LGATE
= +10mA
I
LGATE
= -100mA
330
170
400
290
0
0.9
1.4
1.4
0.9
440
400
2
1.6
2.5
2.5
1.6
kHz
µA
µA
FN9258 Rev 3.00
June 8, 2011
Page 4 of 22
ISL88731
Electrical Specifications
PARAMETER
Dead Time
DCIN = CSSP = CSSN = 18V, CSOP = CSON = 12V, VDDP = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V,
CVDDP = 1µF, IVDDP = 0mA, T
A
= -10°C to +100°C. Boldface limits apply over the operating temperature range, -10°C to +100°C.
(Continued)
CONDITIONS
Falling UGATE to rising LGATE or
falling LGATE to rising UGATE
MIN
(Note 6)
35
TYP
50
MAX
(Note 6) UNITS
80
ns
ERROR AMPLIFIERS
GMV Amplifier Transconductance
GMI Amplifier Transconductance
GMS Amplifier Transconductance
GMI/GMS Saturation Current
GMV Saturation Current
ICOMP, VCOMP Clamp Voltage
0.25V < V
ICOMP, VCOMP
< 3.5V
200
40
40
15
10
200
250
50
50
21
17
300
300
60
60
25
30
400
µA/V
µA/V
µA/V
µA
µA
mV
LOGIC LEVELS
SDA/SCL Input Low Voltage
SDA/SCL Input High Voltage
SDA/SCL Input Bias Current
SDA, Output Sink Current
VDDSMB = 2.7V to 5.5V
VDDSMB = 2.7V to 5.5V
VDDSMB = 2.7V to 5.5V
V
SDA
= 0.4V
2
-1
7
15
1
0.8
V
V
µA
mA
NOTE:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
SMBus Timing Specification
PARAMETERS
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 (Note 7)
SCL Low Period
SCL High Period
VDDSMB = 2.7V to 5.5V
SYMBOL
FSMB
TBUF
THD:STA
TSU:STA
TSU:STO
THD:DAT
TSU:DAT
TTIMEOUT
TLOW
THIGH
CONDITIONS
MIN
10
4.7
4
4.7
4
300
250
22
4.7
4
140
180
220
25
30
TYP
MAX
100
UNITS
kHz
µs
µs
µs
µs
ns
ns
ms
µs
µs
s
Maximum Charging Period Without a SMBus Write to
ChargeVoltage or ChargeCurrent Register
NOTE:
7. If SCL is low for longer than the specified time, the charger is disabled.
FN9258 Rev 3.00
June 8, 2011
Page 5 of 22
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