DATASHEET
ISL6251, ISL6251A
Low Cost Multi-Chemistry Battery Charger Controller
The ISL6251, ISL6251A is a highly integrated battery charger
controller for Li-Ion/Li-Ion polymer batteries and NiMH
batteries. High efficiency is achieved by a synchronous buck
topology and the use of a MOSFET, instead of a diode, for
selecting power from the adapter or battery. The low side
MOSFET emulates a diode at light loads to improve the light
load efficiency and prevent system bus boosting.
The constant output voltage can be selected for 2, 3 and 4
series Li-Ion cells with 0.5% accuracy over-temperature. It can
be also programmed between 4.2V+5%/cell and 4.2V-5%/cell
to optimize battery capacity. When supplying the load and
battery charger simultaneously, the input current limit for the
AC adapter is programmable to within 3% accuracy to avoid
overloading the AC adapter, and to allow the system to make
efficient use of available adapter power for charging. It also
has a wide range of programmable charging current. The
ISL6251, ISL6251A provides outputs that are used to monitor
the current drawn from the AC adapter, and monitor for the
presence of an AC adapter. The ISL6251, ISL6251A
automatically transitions from regulating current mode to
regulating voltage mode.
FN9202
Rev 3.00
March 13, 2014
Features
• ±0.5% Charge Voltage Accuracy (-10°C to +100°C)
• ±3% Accurate Input Current Limit
• ±3% Accurate Battery Charge Current Limit
• ±25% Accurate Battery Trickle Charge Current Limit
(ISL6251A)
• Programmable Charge Current Limit, Adapter Current Limit
and Charge Voltage
• Fixed 300kHz PWM Synchronous Buck Controller with Diode
Emulation at Light Load
• Output for Current Drawn from AC Adapter
• AC Adapter Present Indicator
• Fast Input Current Limit Response
• Input Voltage Range 7V to 25V
• Supports 2, 3 and 4 Cells Battery Pack
• Up to 17.64V Battery-Voltage Set Point
• Thermal Shutdown
• Support Pulse Charging
• Less than 10µA Battery Leakage Current
• Charge Any Battery Chemistry: Li-Ion, NiCd, NiMH, etc.
• Pb-Free (RoHS Compliant)
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL6251HRZ
ISL6251HAZ
PART
MARKING
ISL 6251HRZ
ISL 6251HAZ
TEMP
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
-10 to +100 28 Ld 5x5 QFN L28.55
-10 to +100 24 Ld QSOP
M24.15
Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistant
ISL6251AHRZ ISL6251 AHRZ -10 to +100 28 Ld 5x5 QFN L28.55
ISL6251AHAZ ISL6251 AHAZ -10 to +100 24 Ld QSOP
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
ISL6251, ISL6251A.
For more information on MSL please
see techbrief
TB363.
M24.15
FN9202 Rev 3.00
March 13, 2014
Page 1 of 20
ISL6251, ISL6251A
Pin Configurations
ISL6251, ISL6251A
(28 LD QFN)
TOP VIEW
ACPRN
ACSET
CSON
DCIN
VDD
NA
NA
VDD
ACSET
EN
21
20
19
18
17
16
15
8
ACLIM
9
VADJ
10
GND
11
PGND
12
LGATE
13
VDDP
14
BOOT
CSOP
CSIN
CSIP
NA
NA
PHASE
UGATE
CELLS
ICOMP
VCOMP
ICM
VREF
CHLIM
ACLIM
VADJ
GND
ISL6251, ISL6251A
(24 LD QSOP)
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
DCIN
ACPRN
CSON
CSOP
CSIN
CSIP
PHASE
UGATE
BOOT
VDDP
LGATE
PGND
28
EN
CELLS
ICOMP
VCOMP
ICM
VREF
CHLIM
1
2
3
4
5
6
7
27
26
25
24
23
22
FN9202 Rev 3.00
March 13, 2014
Page 2 of 20
ISL6251, ISL6251A
Absolute Maximum Ratings
DCIN, CSIP, CSON to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +28V
CSIP-CSIN, CSOP-CSON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
PHASE to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-7V to 30V
BOOT to PGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +35V
ACLIM, ACPRN, CHLIM, VDD to GND . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
BOOT-PHASE, VDDP-PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
ICM, ICOMP, VCOMP to GND . . . . . . . . . . . . . . . . . . . . . . .-0.3V to VDD+0.3V
VREF, CELLS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to VDD+0.3V
EN, VADJ, PGND to GND . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to VDD+0.3V
UGATE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PHASE-0.3V to BOOT+0.3V
LGATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PGND-0.3V to VDDP+0.3V
Thermal Information
Thermal Resistance
JA
(°C/W)
JC
(°C/W)
QFN Package (Notes 5, 7) . . . . . . . . . . . . . .
39
9.5
QSOP Package (Note 6). . . . . . . . . . . . . . . .
88
N/A
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-10°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . .-10°C to +100°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C 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. When the voltage across ACSET is below 0V, the current through ACSET should be limited to less than 1mA.
5.
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.
6.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
7. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
8. BOOT-PHASE voltage is -0.3V to -0.7V during start-up. This is due to a small current (<1mA) that flows from the battery to the PHASE pin and to an
internal current sink on the BOOT pin through an internal diode. This does not harm the part.
Electrical Specifications
the operating temperature range, -10°C to +100°C.
PARAMETER
SUPPLY AND BIAS REGULATOR
DCIN Input Voltage Range
DCIN Quiescent Current
Battery Leakage Current (Note 9)
VDD Output Voltage/Regulation
VDD Undervoltage Lockout Trip Point
DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = 1.5V, ACLIM = VREF, VADJ = Floating, EN = VDD = 5V,
BOOT-PHASE = 5.0V, GND = PGND = 0V, C
VDD
= 1µF, I
VDD
= 0mA, T
A
= -10°C to +100°C, T
J
125°C, unless otherwise noted.
Boldface limits apply over
MIN
(Note 10)
MAX
(Note 10)
TEST CONDITIONS
TYP
UNITS
7
EN = VDD or GND, 7V
DCIN 25V
DCIN = 0, no load
7V
DCIN 25V,
0
I
VDD
30mA
VDD Rising
Hysteresis
4.925
4.0
200
2.365
-0.5
-0.5
-0.5
-0.5
-0.5
-0.5
-0.5
-0.5
-0.5
1.4
3
5.075
4.4
250
2.39
25
3
10
5.225
4.6
400
2.415
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
V
mA
µA
V
V
mV
V
%
%
%
%
%
%
%
%
%
Reference Output Voltage VREF
Battery Charge Voltage Accuracy
0
I
VREF
300µA
CSON = 16.8V, CELLS = VDD, VADJ = Float
CSON = 12.6V, CELLS = GND, VADJ = Float
CSON = 8.4V, CELLS = Float, VADJ = Float
CSON = 17.64V, CELLS = VDD, VADJ = VREF
CSON = 13.23V, CELLS = GND, VADJ = VREF
CSON = 8.82V, CELLS = Float, VADJ = VREF
CSON = 15.96V, CELLS = VDD, VADJ = GND
CSON = 11.97V, CELLS = GND, VADJ = GND
CSON = 7.98V, CELLS = Float, VADJ = GND
TRIP POINTS
ACSET Threshold
ACSET Input Bias Current Hysteresis
ACSET Input Bias Current
ACSET
1.26V
1.24
2.2
2.2
1.26
3.4
3.4
1.28
4.4
4.4
V
µA
µA
FN9202 Rev 3.00
March 13, 2014
Page 3 of 20
ISL6251, ISL6251A
DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = 1.5V, ACLIM = VREF, VADJ = Floating, EN = VDD = 5V,
BOOT-PHASE = 5.0V, GND = PGND = 0V, C
VDD
= 1µF, I
VDD
= 0mA, T
A
= -10°C to +100°C, T
J
125°C, unless otherwise noted.
Boldface limits apply over
the operating temperature range, -10°C to +100°C.
(Continued)
PARAMETER
ACSET Input Bias Current
OSCILLATOR
Frequency
PWM Ramp Voltage (Peak-Peak)
CSIP = 18V
CSIP = 11V
SYNCHRONOUS BUCK REGULATOR
Maximum Duty Cycle
UGATE Pull-Up Resistance
UGATE Source Current
UGATE Pull-Down Resistance
UGATE Sink Current
LGATE Pull-Up Resistance
LGATE Source Current
LGATE Pull-DOWN Resistance
LGATE Sink Current
CHARGING CURRENT SENSING AMPLIFIER
Input Common-Mode Range
Input Offset Voltage
Input Bias Current at CSOP
Input Bias Current at CSON
CHLIM Input Voltage Range
CSOP to CSON Full-Scale Current Sense
Voltage
ISL6251: CHLIM = 3.3V
ISL6251A, CHLIM = 3.3V
ISL6251: CHLIM = 2.0V
ISL6251A: CHLIM = 2.0V
ISL6251: CHLIM = 0.2V
ISL6251A: CHLIM = 0.2V
CHLIM Input Bias Current
CHLIM Power-Down Mode Threshold
Voltage
CHLIM Power-Down Mode Hysteresis
Voltage
ADAPTER CURRENT SENSING AMPLIFIER
Input Common-Mode Range
Input Offset Voltage
Input Bias Current at CSIP and CSIN
Combined
Input Bias Current at CSIN
Note 11
CSIP = CSIN = 25V
0 < CSIN < DCIN (Note 11)
7
-2
100
0.10
25
2
130
1
V
mV
µA
µA
CHLIM = GND or 3.3V, DCIN = 0V
CHLIM rising
Note 11
0 < CSOP < 18V
0 < CSON < 18V
0
157
160
95
97
5.0
7.5
-1
80
15
88
25
165
165
100
100
10
10
0
-2.5
0
0.25
75
18
2.5
2
100
3.6
173
170
105
103
15.0
12.5
1
95
40
V
mV
µA
µA
V
mV
mV
mV
mV
mV
mV
µA
mV
mV
BOOT-PHASE = 5V, 500mA source current
BOOT-PHASE = 5V, BOOT-UGATE = 2.5V
BOOT-PHASE = 5V, 500mA sink current
BOOT-PHASE = 5V, UGATE-PHASE = 2.5V
VDDP-PGND = 5V, 500mA source current
VDDP-PGND = 5V, VDDP-LGATE = 2.5V
VDDP-PGND = 5V, 500mA sink current
VDDP-PGND = 5V, LGATE = 2.5V
97
99
1.8
1.0
1.0
1.8
1.8
1.0
1.0
1.8
1.8
3.0
1.8
99.6
3.0
%
A
A
A
A
245
300
1.6
1
355
kHz
V
V
ACSET < 1.26V
TEST CONDITIONS
MIN
(Note 10)
-1
TYP
0
MAX
(Note 10)
1
UNITS
µA
Electrical Specifications
FN9202 Rev 3.00
March 13, 2014
Page 4 of 20
ISL6251, ISL6251A
DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = 1.5V, ACLIM = VREF, VADJ = Floating, EN = VDD = 5V,
BOOT-PHASE = 5.0V, GND = PGND = 0V, C
VDD
= 1µF, I
VDD
= 0mA, T
A
= -10°C to +100°C, T
J
125°C, unless otherwise noted.
Boldface limits apply over
the operating temperature range, -10°C to +100°C.
(Continued)
PARAMETER
ADAPTER CURRENT LIMIT THRESHOLD
CSIP to CSIN Full-Scale Current Sense
Voltage
ACLIM = VREF
ACLIM = Float
ACLIM = GND
ACLIM Input Bias Current
ACLIM = VREF
ACLIM = GND
VOLTAGE REGULATION ERROR AMPLIFIER
Error Amplifier Transconductance from
CSON to VCOMP
CURRENT REGULATION ERROR AMPLIFIER
Charging Current Error Amplifier
Transconductance
Adapter Current Error Amplifier
Transconductance
BATTERY CELL SELECTOR
CELLS Input Voltage for 4 Cell Select
CELLS Input Voltage for 3 Cell Select
CELLS Input Voltage for 2 Cell Select
LOGIC INTERFACE
EN Input Voltage Range
EN Threshold Voltage
Rising
Falling
Hysteresis
EN Input Bias Current
ACPRN Sink Current
ACPRN Leakage Current
ICM Output Accuracy
(Vicm = 19.9 x (Vcsip-Vcsin))
EN = 2.5V
ACPRN = 0.4V
ACPRN = 5V
CSIP - CSIN = 100mV
CSIP - CSIN = 75mV
CSIP - CSIN = 50mV
Thermal Shutdown Temperature
Thermal Shutdown Temperature
Hysteresis
NOTES:
9. This is the sum of currents in these pins (CSIP, CSIN, BOOT, UGATE, PHASE, CSOP, CSON) all tied to 16.8V. No current in pins EN, ACSET, VADJ, CELLS,
ACLIM, CHLIM.
10. 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.
11. Limits established by characterization and are not production tested.
0
1.030
0.985
30
1.8
3
-0.5
-3
-4
-5
0
0
0
150
25
1.06
1.000
60
2.0
8
VDD
1.100
1.025
90
2.2
11
0.5
+3
+4
+5
V
V
V
mV
µA
mA
µA
%
%
%
°C
°C
2.1
4.3
2
4.2
V
V
V
50
50
µA/V
µA/V
CELLS = VDD
30
µA/V
97
72
47
10
-20
100
75
50
16
-16
103
78
53
20
-10
mV
mV
mV
µA
µA
TEST CONDITIONS
MIN
(Note 10)
TYP
MAX
(Note 10)
UNITS
Electrical Specifications
FN9202 Rev 3.00
March 13, 2014
Page 5 of 20
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