an1363

ISL6256AEVAL1Z Evaluation Board
Setup Procedure
®
Application Note
October 26, 2007
AN1363.0
Low Cost Multi-Chemistry Battery
Charger Controller
Features
The ISL6256, ISL6256A is a highly integrated battery charger
controller for Li-ion/Li-ion polymer 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.
• ±3% Accurate Input Current Limit
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 make efficient use of available adapter power
for charging. It also has a wide range of programmable
charging current. The ISL6256, ISL6256A provides outputs
that are used to monitor the current drawn from the AC
adapter, and monitor for the presence of an AC adapter. The
ISL6256, ISL6256A automatically transitions from regulating
current mode to regulating voltage mode.
• Overvoltage Protection
The ISL6256, ISL6256A 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.
• Less than 10µA Battery Leakage Current
• ±0.5% Charge Voltage Accuracy (-10°C to +100°C)
Ordering Information
• 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-Cell 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
• Supports Pulse Charging
• Pb-Free (RoHS Compliant)
Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistant)
Pinout
ISL6256, ISL6256A
(28 LD QFN)
TOP VIEW
1
DCPRN
ACPRN
CSON
28
27
26
25
24
23
22
EN
1
21
CSOP
CELLS
2
20
CSIN
ICOMP
3
19
CSIP
VCOMP
4
18
SGATE
17
BGATE
6
16
PHASE
CHLIM
7
15
UGATE
8
9
10
11
12
13
14
VDDP
5
BOOT
ICM
VREF
VADJ
NOTE: 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.
DCIN
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel
specifications.
VDD
ISL6256AHRZ* ISL6256 AHRZ -10 to +100 28 Ld 5x5 QFN L28.5×5
ACSET
-10 to +100 28 Ld 5x5 QFN L28.5×5
LGATE
PKG.
DWG. #
PGND
PACKAGE
(Pb-free)
GND
TEMP
RANGE
(°C)
PART
MARKING
ISL 6256HRZ
• Programmable Charge Current Limit, Adapter Current
Limit and Charge Voltage
DCSET
ISL6256HRZ*
• ±25% Accurate Battery Trickle Charge Current Limit
ACLIM
PART
NUMBER
(Note)
• ±3% Accurate Battery Charge Current Limit
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. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1363
What’s Inside
Step 3: Select the Battery Charger Current Limit
(Table 3)
This Evaluation Board Kit contains the following materials:
• Qty(1) ISL625xEVAL1Z Evaluation Board
• Qty(1) ISL6256EVAL1Z Setup Procedure
What is Needed
The following materials are recommended to perform
testing:
• One adjustable 25V 6A power supply
• Two adjustable electronic loads with constant current
mode and constant voltage mode.
• Two DVMs
• One 500MHz four channel oscilloscope
• Four passive oscilloscope voltage probes
• Two 10ADC Current Probes
• One Signal generator
Jumper Selection Guide
The CHLIM pin chooses the desired battery charger current
limit threshold. Preset battery charger current limit
thresholds are selected by placing a shunt jumper across the
appropriate pins of JP4. For other battery charger current
limit thresholds, install a shunt jumper across pins 3 and 4,
which connects the wiper of potentiometer R22 to CHLIM.
Potentiometer R22 may be removed and replaced with
resistors R6 and R7.
TABLE 3. JUMPER JP4 FUNCTIONS
100% CURRENT
CHLIM PIN
SHUNT
FEEDBACK
JUMPER CONNECTED
CSOP TO CSON
TO:
LOCATION
100%
CONSTANT
CURRENT
1-3
VREF
120mV
4.80A
Removed
Floating
0V
0A
3-5
GND
0V
0A
3-4
R22 or R6/R7
0mV to 120mV
0A to 4.8A
Step 1: Select the Number of Cells (Table 1)
Step 4: Select the AC Adapter Current Limit (Table 4)
The CELLS pin chooses the correct output voltage clamp for
a given number of cells series-connected in the battery pack.
Select the output voltage by placing a shunt jumper across
the appropriate pins of JP1.
The ACLIM pin chooses the desired AC adapter current limit
threshold. Preset AC adapter current limit thresholds are
selected by placing a shunt jumper across the appropriate
pins of JP5. For other AC adapter current limit thresholds
install a shunt jumper across pins 3 and 4 which connects the
wiper of potentiometer R23 to ACLIM. Potentiometer R23
may be removed and replaced with resistors R17 and R18.
TABLE 1. JUMPER JP1 FUNCTIONS
SHUNT
JUMPER
LOCATION
1-2
NUMBER OF
CELLS
CONNECTED
IN SERIES
CELLS PIN
CONNECTED
TO:
VDD
100%
CONSTANT
OUTPUT
VOLTAGE
4
16.8
2-3
GND
3
12.6
Removed
Floating
2
8.4
TABLE 4. JUMPER JP5 FUNCTIONS
100%
ADAPTER
CURRENT
ACLIM PIN
CONNECTED
TO:
100% CURRENT
FEEDBACK
CSIP TO CSIN
1-3
VREF
100mV
5.15A
Removed
Floating
75mV
3.90A
SHUNT
JUMPER
LOCATION
Step 2: Select the Cell Trim Voltage (Table 2)
3-5
GND
50mV
2.65A
The VADJ pin trims the battery charger output voltage limit.
Preset battery charger output voltage limits are selected by
placing a shunt jumper across the appropriate pins of JP6.
For other battery charger output voltage limits, install a shunt
jumper across pins 3 and 4, which connects the wiper of
potentiometer R24 to VADJ. Potentiometer R24 may be
removed and replaced with resistors R19 and R21. Resistor
R20 limits the trim increase to 1%. Shorting R20 allows the
trim to increase 5%. Decreasing trim range is unaffected.
3-4
R23 or R17/R18
50mV to 100mV
2.65A to
5.15A
Interface Connections
TABLE 5.
HEADER
H1
Input Power
TABLE 2. JUMPER JP6 FUNCTIONS
SHUNT
JUMPER
LOCATION
VADJ
PIN
BATTERY
VOLTAGE CHANGE
PER CELL
1-3
To VREF
+5%
3-5
To GND
-5%
5-6
Floating
None
3-4
R24 Wiper or R19/R21
2
Adjustable between
-5% to +5%
H2
System Load
Output
H3
Battery Charger
Output
PIN#
1
CONNECT TO
“+” INPUT POWER
2
“+” SENSE (if used)
3
“-” SENSE (if used)
4
“-” INPUT POWER
1
“+” SYSTEM LOAD OUTPUT
2
“+” SENSE (if used)
3
“-” SENSE (if used)
4
“-” SYSTEM LOAD OUTPUT
1
“+” BATTERY CHARGER OUTPUT
2
“+” SENSE (if used)
3
“-” SENSE (if used)
4
“-” BATTERY CHARGER OUTPUT
AN1363.0
October 26, 2007
ISL6256AEVAL1Z Schematic
Q3
SI4413DY
2
2
DCIN
DCIN PULLUP
JP12
0
JP17
1 2
TP27
TP26
C3
JP15
1 2
JP14
1 2
R27
1 2
JP7
0
0.1UF
VDDP
VADJ
TP17
ACLIM
TP18
IRF7811AV
5
6
7
8
JP9
1 2
LGATE
TP23
TP7
R17
TP14
NOT POPULATED
ACLIM_ADJ
R22
20K
R18
JP4
1 2
34
56
JP5
1 2
34
56
NOT POPULATED
CHLIM_ADJ
R6
DNP
NOT POPULATED
NOT POPULATED
R30
R7
TP20
R24
50K
R23
20K
L1OUT
C15
22UF
BATTERY
P3
NOT POPULATED
C14
C13
0.01UF
51
H3
0.1UF
R28
0
C8
NOT POPULATED
TP8
NOT POPULATED
VADJ_ADJ
R21
R19
TP5
R20
33.2K
Q2
R1
0.025
C1
R25
FDS6612A
TP24
10UF
JP10
1 2
L1
15UH
22UF
1
P4
VADJ_LIM
JP6
1 2
34
56
R12
4
3
2
1
C9
0
TP19
TP21
2.2
CSIN
BGATE
TP11
UGATE
15
BOOT
4.7
R15
CHLIM
TP10
TP1
1
VREF
PHASE
16
R16
D2 3
VDD
10K
R29
2.2UF
CELLS
TP4
17
BAT54WT1
C2
1 2
JP11
5
6
7
8
PHASE
UGATE
1 2
JP8
4
3
2
1
BGATE
18
BOOT_CUR 0.1UF
ICM
VREF
CHLIM
EP
JP1
TP2
19
CSIP
U1
8
9
10
11
12
13
14
29
20
NOT POPULATED
0.01UF
7
ISL6256AHRZ SGATE
10K
C7
100PF
R14
C6
C5
6800PF
R3
100K
TP16
VCOMP
EN
6
ICOMP
VCOMP
Q1
21
ACLIM
VADJ
GND
PGND
LGATE
VDDP
BOOT
EN
5
JP3
12
DCSET
ACSET
VDD
DCIN
DCPRN
ACPRN
CSON
28
27
26
25
24
23
22
SGATE
CSIP
CSOP
R5
100K
ICM
4
CSOP
CSIN
TP29
TP28
1
2
3
4
1X4
Application Note 1363
3
ICOMP
TP13
EN
CELLS
Q4
2
C4
1UF
8
7
6
5
1
TP9
SI4835BDY
TP6
JP16
1 2
1
2
3
4
DCPRN
100K
3
R4
NOT POPULATED
ACPRN
TP3
1
2
3
1X3
H2
1
2
3
4
1X4
0.1UF
TP25
H4
1
2
3
4
1X4
C12
0.1UF
C10
1 2
TP22
C16
4
18
3
5
ACSET
R11
10.2K
DCSET
R10
10.5K
NOT POPULATED
6
P2
NOT POPULATED
Q5
SYSTEM
R2
0.020
R13
1
2
JP13
12
3
NDS352AP
1
7
1
1
2
3
4
1X4
TP15
8
R26
TP12
0.1UF
R8
R9
C11
H1
100K
P1
130K
AC ADAPTER
AN1363.0
October 26, 2007
Application Note 1363
TABLE 6. BILL OF MATERIALS
QTY
REF DES
1
C6
1
DESCRIPTION
MFG NAME
PART NUMBER
Capacitor, SMD, 0603, 100pF, 50V, 5%, COG
TDK
C1608COG1H101J
C7
Capacitor, SMD, 0805, 0.01µF, 50V, 5%, COG
TDK
C2012COG1H103J
1
C5
Capacitor, SMD, 0805, 6800pF, 50V, 5%, COG
TDK
C2012COG1H682J
3
C2, C4, C8
Capacitor, SMD, 0805, 1.0µF, 16V, 20%, X7R
TDK
C2012X7R1C105M
3
C3, C9, C10
Capacitor, SMD, 0805, 0.1µF, 50V, 10%, X7R
TDK
C2012X7R1H104K
2
C14, C15
Capacitor, SMD, 1812, 22µF, 25V, 20%, X5R
TDK
C4532X5R1E226M
1
D2
SURFACE MOUNT SCHOTTKY BARRIER DIODE
Diodes Inc.
BAT54WT1
1
L1
CHOKE, SMD, 8MM, 4.6µH, 9.1A, SHIELDED
Sumida
CDRH127/LD-4R6NC
1
U1
IC, Battery Charger, 28P, QFN, -10°C to +100°C
Intersil
ISL6256HRZ
1
Q2
MOSFET, N-CH, 8P, SOIC, 30V, 8.4A, 0.022Ω
Fairchild
FDS6612A
1
Q1
MOSFET, N-CH, 8P, SOIC, 30V, 10.8A, 0.011Ω
IR
IRF7811AV
1
Q3
MOSFET, P-CH, SOIC, 30V, 13A, 0.014Ω
Siliconix
SI4413DY
1
Q4
MOSFET, P-CH, SOIC, 30V, 6A, 0.033Ω
Siliconix
SI4835BDY
1
Q5
MOSFET, P-CH, 3P, SOT23, -30V, -0.9A, 0.5Ω
Fairchild
NDS352AP
1
D2
SURFACE MOUNT SCHOTTKY BARRIER DIODE
Diodes Inc.
BAT54WT1
1
R2
Resistor, Shunt, SMD, 2010, 0.020Ω, 1W, 1%
IRC
LRC-LRF2010-01-R020-F
1
R1
Resistor, Shunt, SMD, 2010, 0.025Ω, 1W, 1%
IRC
LRC-LRF2010-01-R025-F
1
R13
Resistor, SMD, 0805, 18Ω, 0.125W, 5%
KOA
RK73B2AT180J
1
R12
Resistor, SMD, 0805, 2.2Ω, 0.125W, 5%
KOA
RK73B2AT2R2J
1
R15
Resistor, SMD, 0805, 4.7Ω, 0.125W, 5%
KOA
RK73B2AT4R7J
1
R14
Resistor, SMD, 0805, 10kΩ, 0.125W, 1%
KOA
RK73H2AT1002F
1
R11
Resistor, SMD, 0805, 7.87kΩ, 0.125W, 1%
KOA
RK73H2AT7871F
3
R3, R4, R8
Resistor, SMD, 0805, 100kΩ, 0.125W, 1%
KOA
RK73H2AT1003F
1
R20
Resistor, SMD, 0805, 33.2kΩ, 0.125W, 1%
KOA
RK73H2AT3322F
2
R10, R16
Resistor, SMD, 0805, 0Ω, 2A, 50mΩ Max
KOA
RK73Z2AT
4
AN1363.0
October 26, 2007
5
Application Note 1363
FIGURE 1. TOP SILK
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6
Application Note 1363
FIGURE 2. TOP LAYER
AN1363.0
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7
Application Note 1363
FIGURE 3. LAYER 2 GROUND (TOP VIEW)
AN1363.0
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8
Application Note 1363
FIGURE 4. LAYER 3 SIGNAL (TOP VIEW)
AN1363.0
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9
Application Note 1363
FIGURE 5. LAYER 4 GROUND (TOP VIEW)
AN1363.0
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10
Application Note 1363
FIGURE 6. LAYER 5 GROUND (TOP VIEW)
AN1363.0
October 26, 2007
11
Application Note 1363
FIGURE 7. BOTTOM COPPER (BOTTOM VIEW)
AN1363.0
October 26, 2007
12
Application Note 1363
FIGURE 8. BOTTOM SILK SCREEN (BOTTOM VIEW)
AN1363.0
October 26, 2007
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is
current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
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