Intersil ISL6251AHAZ, ISL6251AHRZ, ISL6251HAZ, ISL6251HRZ Schematics
Low Cost Multi-Chemistry Battery Charger Controller
ISL6251, ISL6251A
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.
Ordering Information
TEMP
PART NUMBER
(Notes 1, 2, 3)
ISL6251HRZ ISL 6251HRZ -10 to +100 28 Ld 5x5 QFN L28.5×5
ISL6251HAZ ISL 6251HAZ -10 to +100 24 Ld QSOP M24.15
ISL6251AHRZ ISL6251 AHRZ -10 to +100 28 Ld 5x5 QFN L28.5×5
ISL6251AHAZ ISL6251 AHAZ -10 to +100 24 Ld QSOP M24.15
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347
reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pbfree 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
see techbrief TB363
PART
MARKING
, ISL6251A. For more information on MSL please
.
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
for details on
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)
Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistant
March 13, 2014
FN9202.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
|Copyright Intersil Americas LLC 2005-2006, 2014. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Pin Configurations
1
2
3
4
5
6
7
21
20
19
18
17
16
15
28 27 26 25 24 23 22
8 9 10 11 12 13 14
EN
CELLS
ICOMP
VCOMP
ICM
VREF
CHLIM
ACLIM
PGND
LGATE
VDDP
BOOT
CSOP
PHASE
UGATE
ACSET
DCIN
ACPRN
CSON
VADJ
GND
CSIN
CSIP
NA
NA
NA
VDD
NA
DCIN
124
VDD
223
ACPRN ACSET
322
CSON
421
CSOP
EN
520
CSIN
CELLS
619
CSIP
ICOMP
718
VCOMP
817
ICM
916
PHASE
VREF
10 15
UGATE
CHLIM
11 14
BOOT
ACLIM
12 13
VDDP
VADJ LGATE
GND PGND
ISL6251, ISL6251A
(28 LD QFN)
TOP VIEW
ISL6251, ISL6251A
ISL6251, ISL6251A
(24 LD QSOP)
TOP VIEW
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ISL6251, ISL6251A
Absolute Maximum Ratings Thermal Information
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
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.
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
5. θ
JA
Brief TB379
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
6. θ
JA
7. Fo r θ
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.
.
, the “case temp” location is the center of the exposed metal pad on the package underside.
JC
Thermal Resistance θ
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
(°C/W) θJC (°C/W)
JA
Electrical Specifications 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
the operating temperature range, -10°C to +100°C.
PARAMETER TEST CONDITIONS
SUPPLY AND BIAS REGULATOR
DCIN Input Voltage Range 725V
DCIN Quiescent Current EN = VDD or GND, 7V ≤ DCIN ≤ 25V 1.4 3 mA
Battery Leakage Current (Note 9) DCIN = 0, no load 3 10 µA
VDD Output Voltage/Regulation 7V ≤ DCIN ≤ 25V, 0 ≤ I
VDD Undervoltage Lockout Trip Point VDD Rising 4.0 4.4 4.6 V
Reference Output Voltage VREF 0 ≤ I
Battery Charge Voltage Accuracy CSON = 16.8V, CELLS = VDD, VADJ = Float -0.5 0.5 %
TRIP POINTS
ACSET Threshold 1.24 1.26 1.28 V
ACSET Input Bias Current Hysteresis 2.2 3.4 4.4 µA
ACSET Input Bias Current ACSET ≥ 1.26V 2.2 3.4 4.4 µA
= 1µF, I
VDD
Hysteresis 200 250 400 mV
VREF
CSON = 12.6V, CELLS = GND, VADJ = Float -0.5 0.5 %
CSON = 8.4V, CELLS = Float, VADJ = Float -0.5 0.5 %
CSON = 17.64V, CELLS = VDD, VADJ = VREF -0.5 0.5 %
CSON = 13.23V, CELLS = GND, VADJ = VREF -0.5 0.5 %
CSON = 8.82V, CELLS = Float, VADJ = VREF -0.5 0.5 %
CSON = 15.96V, CELLS = VDD, VADJ = GND -0.5 0.5 %
CSON = 11.97V, CELLS = GND, VADJ = GND -0.5 0.5 %
CSON = 7.98V, CELLS = Float, VADJ = GND -0.5 0.5 %
= 0mA, TA = -10°C to +100°C, TJ≤ 125°C, unless otherwise noted. Boldface limits apply over
VDD
MIN
(Note 10) TYP
≤ 30mA 4.925 5.075 5.225 V
VDD
≤ 300µA 2.365 2.39 2.415 V
MAX
(Note 10) UNITS
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ISL6251, ISL6251A
Electrical Specifications 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
the operating temperature range, -10°C to +100°C.
PARAMETER TEST CONDITIONS
ACSET Input Bias Current ACSET < 1.26V -1 0 1 µA
OSCILLATOR
Frequency 245 300 355 kHz
PWM Ramp Voltage (Peak-Peak) CSIP = 18V 1.6 V
SYNCHRONOUS BUCK REGULATOR
Maximum Duty Cycle 97 99 99.6 %
UGATE Pull-Up Resistance BOOT-PHASE = 5V, 500mA source current 1.8 3.0 Ω
UGATE Source Current BOOT-PHASE = 5V, BOOT-UGATE = 2.5V 1.0 A
UGATE Pull-Down Resistance BOOT-PHASE = 5V, 500mA sink current 1.0 1.8 Ω
UGATE Sink Current BOOT-PHASE = 5V, UGATE-PHASE = 2.5V 1.8 A
LGATE Pull-Up Resistance VDDP-PGND = 5V, 500mA source current 1.8 3.0 Ω
LGATE Source Current VDDP-PGND = 5V, VDDP-LGATE = 2.5V 1.0 A
LGATE Pull-DOWN Resistance VDDP-PGND = 5V, 500mA sink current 1.0 1.8 Ω
LGATE Sink Current VDDP-PGND = 5V, LGATE = 2.5V 1.8 A
CHARGING CURRENT SENSING AMPLIFIER
Input Common-Mode Range 018V
Input Offset Voltage Note 11 -2.5 0 2.5 mV
Input Bias Current at CSOP 0 < CSOP < 18V 0.25 2 µA
Input Bias Current at CSON 0 < CSON < 18V 75 100 µA
CHLIM Input Voltage Range 03.6V
CSOP to CSON Full-Scale Current Sense
Voltage
CHLIM Input Bias Current CHLIM = GND or 3.3V, DCIN = 0V -1 1 µA
CHLIM Power-Down Mode Threshold
Voltage
CHLIM Power-Down Mode Hysteresis
Voltage
ADAPTER CURRENT SENSING AMPLIFIER
Input Common-Mode Range
Input Offset Voltage Note 11 -2 2 mV
Input Bias Current at CSIP and CSIN
Combined
Input Bias Current at CSIN 0 < CSIN < DCIN (Note 11) 0.10 1 µA
= 1µF, I
VDD
CSIP = 11V 1 V
ISL6251: CHLIM = 3.3V 157 165 173 mV
ISL6251A, CHLIM = 3.3V 160 165 170 mV
ISL6251: CHLIM = 2.0V 95 100 105 mV
ISL6251A: CHLIM = 2.0V 97 100 103 mV
ISL6251: CHLIM = 0.2V 5.0 10 15.0 mV
ISL6251A: CHLIM = 0.2V 7. 5 10 12.5 mV
CHLIM rising 80 88 95 mV
CSIP = CSIN = 25V 100 130 µA
= 0mA, TA = -10°C to +100°C, TJ≤ 125°C, unless otherwise noted. Boldface limits apply over
VDD
(Continued)
MIN
(Note 10) TYP
15 25 40 mV
7 25 V
MAX
(Note 10) UNITS
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ISL6251, ISL6251A
Electrical Specifications 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
the operating temperature range, -10°C to +100°C.
PARAMETER TEST CONDITIONS
ADAPTER CURRENT LIMIT THRESHOLD
CSIP to CSIN Full-Scale Current Sense
Voltage
ACLIM Input Bias Current ACLIM = VREF 10 16 20 µA
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 4.3 V
CELLS Input Voltage for 3 Cell Select 2 V
CELLS Input Voltage for 2 Cell Select 2.1 4.2 V
LOGIC INTERFACE
EN Input Voltage Range 0VDDV
EN Threshold Voltage Rising 1.030 1.06 1.100 V
EN Input Bias Current EN = 2.5V 1.8 2.0 2.2 µA
ACPRN Sink Current ACPRN = 0.4V 3 8 11 mA
ACPRN Leakage Current ACPRN = 5V -0.5 0.5 µA
ICM Output Accuracy
(Vicm = 19.9 x (Vcsip-Vcsin))
Thermal Shutdown Temperature 150 °C
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.
= 1µF, I
VDD
ACLIM = VREF 97 100 103 mV
ACLIM = Float 72 75 78 mV
ACLIM = GND 47 50 53 mV
ACLIM = GND -20 -16 -10 µA
CELLS = VDD 30 µA/V
Falling 0.985 1.000 1.025 V
Hysteresis 30 60 90 mV
CSIP - CSIN = 100mV -3 0 +3 %
CSIP - CSIN = 75mV -4 0 +4 %
CSIP - CSIN = 50mV -5 0 +5 %
= 0mA, TA = -10°C to +100°C, TJ≤ 125°C, unless otherwise noted. Boldface limits apply over
VDD
(Continued)
MIN
(Note 10) TYP
50 µA/V
50 µA/V
25 °C
MAX
(Note 10) UNITS
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ISL6251, ISL6251A
-0.6
-0.3
0
0.3
0.6
0 8 16 24 32 40
VDD LOAD REGULATION A CCURACY (% )
VDD=5.075V
EN=0
LOAD CURRENT (mA)
-0.6
-0.3
0
0.3
0.6
0 8 16 24 32 40
VDD LOAD REGULATION A CCURACY (% )
VDD=5.075V
EN=0
LOAD CURRENT (mA)
0
0.02
0.04
0.06
0.08
0.1
0 100 200 300 400
VREF LOAD REGULATION A CCURACY (%)
VREF=2.390V
LOAD CURRENT (µA)
0
0.02
0.04
0.06
0.08
0.1
0 100 200 300 400
VREF LOAD REGULATION A CCURACY (%)
VREF=2.390V
LOAD CURRENT (µA)
CSIP-CSIN (mV)
0
1
2
3
4
5
6
7
8
9
10
10 20 30 40 50 60 70 80 90
100
|
ICM ACCURACY
|
(%)
0.76
0.8
0.84
0.88
0.92
0.96
1
00.511.522.533.54
EFFICIENCY (% )
CHARGE CURRENT (A)
VCSON=16.8V
4 CELLS
VCSON=12.6V
(3 CELLS)
VCSON=8.4V
2 CELLS
0.76
0.8
0.84
0.88
0.92
0.96
1
00.511.522.533.54
EFFICIENCY (% )
CHARGE CURRENT (A)
VCSON=16.8V
4 CELLS
VCSON=12.6V
(3 CELLS)
VCSON=8.4V
2 CELLS
LOAD
CURRENT
5A/div
A
CURRENT
5A/div
CHARGE
CURRENT
2A/div
BATTERY
VOLTAGE
2V/div
LOAD STEP: 0-4A
CHARGE CURRENT: 3A
A
A
CSON
5V/div
EN
5V/div
INDUCTOR
CURRENT
2A/div
CHARGE
CURRENT
2A/div
CSON
5V/div
EN
5V/div
INDUCTOR
CURRENT
2A/div
CHARGE
CURRENT
2A/div
Typical Operating Performance DCIN = 20V, 4S2P Li-Battery, T
FIGURE 1. VDD LOAD REGULATION
FIGURE 2. VREF LOAD REGULATION
= 25°C, unless otherwise noted.
A
FIGURE 3. ICM ACCURACY vs AC ADAPTER CURRENT FIGURE 4. SYSTEM EFFICIENCY vs CHARGE CURRENT
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C ADAPTER CURRENT LIMI T: 5.15
FIGURE 5. LOAD TRANSIENT RESPONSE FIGURE 6. CHARGE ENABLE AND SHUTDOWN
DAPTER
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ISL6251, ISL6251A
INDUCTOR
CURRENT
2A/div
CSON
10V/div
VCOMP
ICOMP
BATTERY
INSERTION
BATTERY
REMOVAL
VCOMP
2V/div
ICOMP
2V/div
INDUCTOR
CURRENT
2A/div
CSON
10V/div
VCOMP
ICOMP
BATTERY
INSERTION
BATTERY
REMOVAL
VCOMP
2V/div
ICOMP
2V/div
PHASE
10V/div
INDUCTOR
CURRENT
1A/div
UGATE
5V/div
CHLIM=0.2V
CSON=8V
PHASE
10V/div
INDUCTOR
CURRENT
1A/div
UGATE
5V/div
PHASE
10V/div
INDUCTOR
CURRENT
1A/div
UGATE
5V/div
CHLIM=0.2V
CSON=8V
PHASE
10V/div
LGATE
2V/div
UGATE
2V/div
PHASE
10V/div
LGATE
2V/div
UGATE
2V/div
CHLIM
1V/div
CHARGE
CURRENT
1A/div
Typical Operating Performance DCIN = 20V, 4S2P Li-Battery, T
FIGURE 7. BATTERY INSERTION AND REMOVAL FIGURE 8. SWITCHING WAVEFORMS AT DIODE EMULATION
= 25°C, unless otherwise noted. (Continued)
A
FIGURE 9. SWITCHING WAVEFORMS IN CC MODE FIGURE 10. TRICKLE TO FULL-SCALE CHARGING
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