Intersil ISL6255AHAZ, ISL6255AHRZ, ISL6255HAZ, ISL6255HRZ Schematics

®

ISL6255, ISL6255A

Data Sheet May 23, 2006

Highly Integrated Battery Charger with
Automatic Power Source Selector for
Notebook Computers

The ISL6255, ISL6255A is a highly integrated battery charger
controller for Li-Ion/Li-Ion polymer batteries. High Effici ency 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
also be 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 ma ke
efficient use of available adapter power for charging. It also
has a wide range of programmable charging current. The
ISL6255, ISL6255A provides outputs that are used to monitor
the current drawn from the AC adapter , and monito r for th e
presence of an AC adapter. The ISL6255, ISL6255A
automatically transitions from regulating current mode to
regulating voltage mode.

ISL6255, ISL6255A has a feature for automatic power source
selection by switching to the battery when the AC adapter is
removed or switching to the AC adapter when the AC adapter
is available. It also provides a DC adapter monitor to support
aircraft power applications with the option of no battery
charging.

Ordering Information

PART

NUMBER

(Notes 1, 2)

ISL6255HRZ ISL6255HRZ -10 to 100 28 Ld 5x5 QFN L28.5×5
ISL6255HAZ ISL6255HAZ -10 to 100 28 Ld QSOP M28.15
ISL6255AHRZ ISL6255AHRZ -10 to 100 28 Ld 5x5 QFN L28.5×5
ISL6255AHAZ ISL6255AHAZ -10 to 100 28 Ld QSOP M28.15

NOTES:

1. Intersil Pb-free plus anneal products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are 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-0 20.

2. Add “-T” for Tape and Reel.

PART

MARKING

TEMP

RANGE (°C)

PACKAGE

(Pb-free)

PKG.

DWG. #

FN9203.2

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
(ISL6255A)

• 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

• Support 2, 3 and 4 Cells Battery Pack

• Up to 17.64V Battery-Voltage Set Point

• Control Adapter Power Source Select MOSFET

• Thermal Shutdown

• Aircraft Power Capable

• DC Adapter Present Indicator

• Battery Discharge MOSFET Control

• Less than 10µA Battery Leakage Current

• Support Pulse Charging

• Charge Any Battery Chemistry: Li-Ion, NiCd, NiMH, etc.

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Notebook, Desknote and Sub-notebook Computers

• Personal Digital Assistant

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 registered trademark of Intersil Americas Inc.

Copyright Intersil Americas Inc. 2005, 2006. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

Pinouts

ISL6255, ISL6255A

(28 LD QFN)

TOP VIEW

ISL6255, ISL6255A

ISL6255, ISL6255A

(28 LD QSOP)

TOP VIEW

EN

CELLS

ICOMP

VCOMP

ICM

VREF

CHLIM

DCSET

ACSET

VDD

DCIN

28 27 26 25 24 23 22

1

2

3

4

5

6

7

8 9 10 11 12 13 14

GND

ACLIM

VADJ

PGND

PGND

PGND

DCPRN

LGATE

ACPRN

VDDP

CSON

21

20

19

18

17

16

15

BOOT

CSOP

CSIN

CSIP

SGATE

BGATE

PHASE

UGATE

DCIN

VDD

ACSET

DCSET

EN

CELLS

ICOMP

VCOMP

ICM

VREF

CHLIM

ACLIM

VADJ

GND

1 28

2 27

3 26

4 25

5 24

6 23

7 22

8 21

9 20

10 19

11 18

12 17

13 16

14 15

DCPRN

ACPRN

CSON

CSOP

CSIN

CSIP

SGATE

BGATE

PHASE

UGATE

BOOT

VDDP

LGATE

PGND

2

FN9203.2

May 23, 2006

ISL6255, ISL6255A

Absolute Maximum Ratings Thermal Information

DCIN, CSIP, CSON to GND. . . . . . . . . . . . . . . . . . . . .-0.3V to +28V

CSIP-CSIN, CSOP-CSON. . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V

CSIP-SGATE, CSIP-BGATE . . . . . . . . . . . . . . . . . . . . .-0.3V to 16V

PHASE to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7V to 30V

BOOT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +35V

BOOT to VDDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2V to 28V

ACLIM, ACPRN, CHLIM, DCPRN, VDD to GND. . . . . . .-0.3V to 7V

BOOT-PHASE, VDDP-PGND . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V

ACSET and DCSET to GND (Note 3) . . . . . . . . -0.3V to VDD+0.3V

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: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

3. When the voltage across ACSET and DCSET is below 0V, the current through ACSET and DCSET 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 T ech

4. θ

JA

Brief TB379.

5. For θ

, the “case temp” location is the center of the exposed metal pad on the package underside.

JC

Thermal Resistance θ

(°C/W) θJC (°C/W)

JA

QFN Package (Notes 4, 5). . . . . . . . . . 39 9.5

QSOP Package (Note 4) . . . . . . . . . . . 80 NA

Junction Temperature Range. . . . . . . . . . . . . . . . . .-10°C to +150°C

Operating Temperature Range . . . . . . . . . . . . . . . .-10°C to +100°C

Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C

Lead Temperature (soldering, 10s) . . . . . . . . . . . . . . . . . . . .+300°C

Electrical Specifications DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET= DCSET = 1.5V, ACLIM = VREF,

VADJ=Floating, EN=VDD=5V, BOOT-PHASE=5.0V, GND=PGND=0V, C
T

= -10°C to +100°C, T

A

≤ 125°C, unless otherwise noted.

J

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

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 6) DCIN = 0, no load 3 10 µA
VDD Output Voltage/Regulation 7V ≤ DCIN ≤ 25V, 0 ≤ I

≤ 30mA 4.925 5.075 5.225 V

VDD

VDD Undervoltage Lockout Trip Point VDD Rising 4.0 4.4 4.6 V

Hysteresis 200 250 400 mV

Reference Output Voltage VREF 0 ≤ I

≤ 300µA 2.365 2.39 2.415 V

VREF

Battery Charge Voltage Accuracy CSON = 16.8V, CELLS = VDD, VADJ = Float -0.5 0.5 %

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 %

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
ACSET Input Bias Current ACSET < 1.26V -1 0 1 µA
DCSET Threshold 1.24 1.26 1.28 V

VDD

=1µF, I

VDD

=0mA,

3

FN9203.2

May 23, 2006

ISL6255, ISL6255A

Electrical Specifications DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET= DCSET = 1.5V, ACLIM = VREF,

VADJ=Floating, EN=VDD=5V, BOOT-PHASE=5.0V, GND=PGND=0V, C
T

= -10°C to +100°C, T

A

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

DCSET Input Bias Current Hysteresis 2.2 3.4 4.4 µA
DCSET Input Bias Current DCSET ≥ 1.26V 2.2 3.4 4.4 µA
DCSET Input Bias Current DCSET < 1.26V -1 0 1 µA

OSCILLATOR

Frequency 245 300 355 kHz
PWM Ramp Voltage (peak-peak) CSIP = 18V 1.6 V

CSIP = 11V 1 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 0 18 V
Input Offset Voltage Guaranteed by design -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 0 3.6 V
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 7 25 V
Input Offset Voltage Guaranteed by design -2 2 mV
Input Bias Current at CSIP and CSIN

Combined
Input Bias Current at CSIN 0 < CSIN < DCIN, Guaranteed by design 0.10 1 µA

ISL6255: CHLIM = 3.3V 157 165 173 mV
ISL6255A: CHLIM = 3.3V 160 165 170 mV
ISL6255: CHLIM = 2.0V 95 100 105 mV
ISL6255A: CHLIM = 2.0V 97 100 103 mV
ISL6255: CHLIM = 0.2V 5.0 10 15.0 mV
ISL6255A: CHLIM = 0.2V 7.5 10 12.5 mV

CHLIM rising 80 88 95 mV

CSIP = CSIN = 25V 100 130 µA

≤ 125°C, unless otherwise noted. (Continued)

J

15 25 40 mV

VDD

=1µF, I

VDD

=0mA,

4

FN9203.2

May 23, 2006

ISL6255, ISL6255A

Electrical Specifications DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET= DCSET = 1.5V, ACLIM = VREF,

VADJ=Floating, EN=VDD=5V, BOOT-PHASE=5.0V, GND=PGND=0V, C
T

= -10°C to +100°C, T

A

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

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 2V
CELLS Input Voltage for 2 Cell Select 2.1 4.2 V

MOSFET DRIVER

BGATE Pull-Up Current CSIP-BGATE= 3V 10 30 45 mA
BGATE Pull-Down Current CSIP-BGATE = 5V 2.7 4.0 5.0 mA
CSIP-BGATE Voltage High 89.611V
CSIP-BGATE Voltage Low 50 0 50 mV
DCIN-CSON Threshold for CSIP-BGATE

Going High
DCIN-CSON Threshold Hysteresis 250 300 400 mV
SGATE Pull-Up Current CSIP-SGATE= 3V 7 12 15 mA
SGATE Pull-Down Current CSIP-SGATE = 5V 50 160 370 µA
CSIP-SGATE Voltage High 8911V
CSIP-SGATE Voltage Low -50 0 50 mV
CSIP-CSIN Threshold for CSIP-SGATE

Going High
CSIP-CSIN Threshold Hysteresis 1.3 5 8 mV

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
DCPRN Sink Current DCPRN = 0.4V 3 8 11 mA

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

DCIN = 12V, CSON Rising -100 0 100 mV

Falling 0.985 1.000 1.025 V
Hysteresis 30 60 90 mV

≤ 125°C, unless otherwise noted. (Continued)

J

2.5 8 13 mV

=1µF, I

VDD

50 µA/V

50 µA/V

VDD

=0mA,

5

FN9203.2

May 23, 2006

ISL6255, ISL6255A

Electrical Specifications DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET= DCSET = 1.5V, ACLIM = VREF,

VADJ=Floating, EN=VDD=5V, BOOT-PHASE=5.0V, GND=PGND=0V, C
T

= -10°C to +100°C, T

A

≤ 125°C, unless otherwise noted. (Continued)

J

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

DCPRN Leakage Current DCPRN = 5V -0.5 0.5 µA
ICM Output Accuracy

(Vicm = 19.9 x (Vcsip-Vcsin))

CSIP-CSIN = 100mV -3 0 +3 %
CSIP-CSIN = 75mV -4 0 +4 %

CSIP-CSIN = 50mV -5 0 +5 %
Thermal Shutdown Temperature 150 °C
Thermal Shutdown Temperature Hysteresis 25 °C

NOTE:

6. This is the sum of currents in these pins (CSIP, CSIN, BGATE, BOOT, UGATE, PHASE, CSOP, CSON) all tied to 16.8V . No current in pins EN,
ACSET, DCSET, VADJ, CELLS, ACLIM, CHLIM.

VDD

=1µF, I

VDD

=0mA,

Typical Operating Performance DCIN = 20V, 4S2P Li-Battery, T

0.6

0.6

VDD=5.075V

VDD=5.075V
EN=0

0.3

0.3

0

0

-0.3

-0.3

-0.6

-0.6

VDD LOAD REGULATION A CCURACY (% )

VDD LOAD REGULATION A CCURACY (% )

0 8 16 24 32 40

0 8 16 24 32 40

LOAD CURRENT (mA)

LOAD CURRENT (mA)

FIGURE 1. VDD LOAD REGULATION

10

9

8

(%)

|

7

6

5

4

3

ICM ACCURACY

|

2

1

0

10 20 30 40 50 60 70 80 90

Test

CSIP-CSIN (mV)

EN=0

100

= 25°C, unless otherwise noted.

A

0.1

0.1

VREF=2.390V

0.08

0.08

0.06

0.06

0.04

0.04

0.02

0.02

0

0

VREF LOAD REGULATION A CCURACY (%)

VREF LOAD REGULATION A CCURACY (%)

0 100 200 300 400

0 100 200 300 400

LOAD CURRENT (µA)

LOAD CURRENT (µA)

VREF=2.390V

FIGURE 2. VREF LOAD REGULATION

1

1

0.96

0.96

VCSON=12.6V

0.92

0.92

0.88

0.88

0.84

0.84

EFFICIENCY (%)

EFFICIENCY (%)

0.8

0.8

0.76

0.76

00.511.522.533.54

00.511.522.533.54

VCSON=12.6V

(3 CELLS)

(3 CELLS)

VCSON=16.8V

VCSON=16.8V
4 CELLS

4 CELLS

CHARGE CURRENT (A)

CHARGE CURRENT (A)

VCSON=8.4V

VCSON=8.4V
2 CELLS

2 CELLS

FIGURE 3. ICM ACCURACY vs AC ADAPTER CURRENT FIGURE 4. SYSTEM EFFICIENCY vs CHARGE CURRENT

6

FN9203.2

May 23, 2006

A

A

ISL6255, ISL6255A

Typical Operating Performance DCIN = 20V, 4S2P Li-Battery, T

DCIN

DCIN
10V/div

10V/div

ACSET

ACSET
1V/div

1V/div

DCSET

DCSET
1V/div

1V/div

DCPRN

DCPRN
5V/div

5V/div
ACPRN

ACPRN
5V/div

5V/div

FIGURE 5. AC AND DC ADAPTER DETECTION

CSON

CSON
5V/div

5V/div

EN

EN
5V/div

5V/div

INDUCTOR

INDUCTOR
CURRENT

CURRENT
2A/div

2A/div

CHARGE

CHARGE
CURRENT

CURRENT
2A/div

2A/div

= 25°C, unless otherwise noted. (Continued)

A

LOAD STEP: 0-4A
CHARGE CURRENT: 3A

C ADAPTER CURRENT LIMIT: 5.15A

FIGURE 6. LOAD TRANSIENT RESPONSE

BATTERY

BATTERY
REMOVAL

REMOVAL

VCOMP

VCOMP

ICOMP

ICOMP

BATTERY

BATTERY
INSERTION

INSERTION

LOAD
CURRENT
5A/div

DAPTER
CURRENT
5A/div

CHARGE
CURRENT
2A/div

BATTERY
VOLTAGE
2V/div

INDUCTOR

INDUCTOR
CURRENT

CURRENT
2A/div

2A/div

CSON

CSON
10V/div

10V/div

VCOMP

VCOMP
2V/div

2V/div

ICOMP

ICOMP
2V/div

2V/div

FIGURE 7. CHARGE ENABLE AND SHUTDOWN FIGURE 8. BATTERY INSERTION AND REMOVAL

CHLIM=0.2V

CHLIM=0.2V
CSON=8V

CSON=8V

PHASE

PHASE
10V/div

PHASE

PHASE

PHASE
10V/div

10V/div

10V/div

INDUCTOR

INDUCTOR

INDUCTOR
CURRENT

CURRENT

CURRENT
1A/div

1A/div

1A/div

UGATE

UGATE

UGATE
5V/div

5V/div

5V/div

10V/div

UGATE

UGATE
2V/div

2V/div

LGATE

LGATE
2V/div

2V/div

FIGURE 9. AC ADAPTER REMOVAL FIGURE 10. AC ADAPTER INSERTION

7

FN9203.2

May 23, 2006