an1364

ISL6256AEVAL2Z Evaluation Board
Setup Procedure
®
Application Note
October 25, 2007
AN1364.0
Low Cost Multi-Chemistry Battery
Charger Controller
Features
The ISL6256AEVAL2Z Evaluation kit includes all the circuitry
needed to demonstrate the capabilities of the ISL6256
Lithium-Ion battery-charger with integrated AC adapter
current limit. The user can experiment with an extensive
matrix of battery charge parameters, AC adapter current
limit, monitor functions and load switching.
• ±3% Accurate Input Current Limit
• ±0.5% Charge Voltage Accuracy (-10°C to +100°C)
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.
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.
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.
• ±3% Accurate Battery Charge Current Limit
• ±25% Accurate Battery Trickle Charge Current Limit
(ISL6256A)
• 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-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
• Less than 10µA Battery Leakage Current
• Support Pulse Charging
• Charge Any Battery Chemistry: Li-ion, NiCd, NiMH, etc.
• Pb-Free (RoHS Compliant)
Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistant
Pinout
ISL6256, ISL6256A
(28 LD QSOP)
TOP VIEW
Ordering Information
PART
NUMBER
(Note)
ISL6256HAZ*
PART
MARKING
ISL 6256HAZ
TEMP
RANGE (°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
-10 to +100 28 Ld QSOP
M28.15
ISL6256AHAZ* ISL6256 AHAZ -10 to +100 28 Ld QSOP
M28.15
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
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 Pbfree peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
1
DCIN
1
28
DCPRN
VDD
2
27
ACPRN
ACSET
3
26
CSON
DCSET
4
25
CSOP
EN
5
24
CSIN
CELLS
6
23
CSIP
ICOMP
7
22
SGATE
VCOMP
8
21
BGATE
ICM
9
20
PHASE
VREF
10
19
UGATE
CHLIM
11
18
BOOT
ACLIM
12
17
VDDP
VADJ
13
16
LGATE
GND
14
15
PGND
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 1364
What’s Inside
Step 3: Select the Battery Charger Current Limit
(Table 3)
This Evaluation Board Kit contains the following materials:
• Qty(1) ISL625xEVAL2Z Evaluation Board
• Qty(1) ISL6256EVAL2Z 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
Through R20 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
AN1364.0
October 25, 2007
ISL6256AEVAL2Z Schematic
Q3
SI4413DY
C10
JP16
1 2
5
6
7
8
C4
VDD
ACPRN
27
3
ACSET
CSON
26
4
DCSET
CSOP
25
5
EN
CSIN
24
6
CELLS
CSIP
23
7
ICOMP
SGATE
22
1 2
1 2
8
VCOMP
BGATE
21
JP8
JP11
ICM
PHASE
20
VREF
UGATE
19
ISL6256HAZ
R15
TP1
VREF
CHLIM
TP10
R28
4
3
2
1
C8
C2
VDD
TP2
TP4
4.7
10UF
TP23
CELLS
2.2UF
1 1
2 23
3
1X3
LGATE
Q2
BATTERY
P3
JP9
1 2
C14
TP24
C
C1
0.01UF
15
I53
JP10
1 2
NOT POPULATED
PGND
D2
GND
I75
P4
TP11
51
16
0.1UF
NOT POPULATED
LGATE
R1
0.025
22UF
VADJ
C9
0
C13
13
R16
R25
17
C15
18
VDDP
FDS6612A
BOOT
ACLIM
1
CHLIM
12
UGATE
5
6
7
8
11
14
10K
C7
VCOMP
100PF
JP1
R14
C6
C5
6800PF
TP16
0.01UF
EN
R3
100K
JP3
12
TP13
B
L1
4.7UH
PHASE
BOOT
9
10
BAT54WT1
ICOMP
Q1
2.2
2
1UF
L1OUT R12
28
4
3
2
1
DCPRN
H3
0.1UF
NOT POPULATED
TP29
TP28
0
VADJ
TP17
ACLIM
TP18
TP19
A
A
TP20
NATHAN MITCHELL
DNP
R17
RELEASED BY:
R23
20K
UPDATED BY:
BOB LYLE
DNP
JP5
1 2
34
56
R18
R6
R22
20K
R7
R24
50K
DNP
JP4
1 2
34
56
DNP
TP8
DNP
R19
1
JP6
1 2
34
56
R21
TP21
DNP
DRAWN BY:
TP5
DATE:
AUG 07 2003
DATE:
DATE:
ENGINEER:
NATHAN MITCHELL
TITLE:
DATE:
MAY 23 2007
ISL6256EVAL2 EVALUATION BOARD
TESTER
TP14
MASK#
HRDWR ID
REV.
C
TP7
FILENAME:
ISL625X_EVAL2.SCH.4.1
8
B
1
2
3
4
1X4
7
6
5
4
3
2
SHEET
1
1
OF 1
Application Note 1364
DCIN
8
7
6
5
1
Q4
IRF7811AV
U1
CSIN
CSOP
R5
100K
CSIP
ACPRN
H4
1
2
3
4
1X4
JP15
1 2
0
DCPRN
TP9
JP14
1 2
R27
22UF
DCIN
C3
TP6
TP26
TP27
BGATE
SI4835BDY
DCIN PULLUP
1 2
JP17
1 2
D
1
2
3
4
R4
JP7
JP12
0.1UF
TP3
H2
1
2
3
4
1X4
NOT POPULATED
0.1UF
TP25
100K
3
C
C12
0.1UF
D1
1 2
TP22
C16
4
P2
NOT POPULATED
3
5
SYSTEM
R2
0.020
18
6
ACSET
R11
10.2K
DCSET
R10
2
R13
Q5
NOT POPULATED
1
7
JP13
12
NDS352AP
8
R26
SGATE
0
1
2
3
4
1X4
TP15
10.5K
D
TP12
0.1UF
R8
C11
H1
130K
R9
P1
100K
AC ADAPTER
AN1364.0
October 25, 2007
Application Note 1364
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
L1
Choke, SMD, 8mm, 15µH, 20%, 5.65A, Shielded
Sumida
CDRH127/LD-150NC
1
U1
IC, Battery Charger, 24 Ld QSOP, -10°C to +100°C
Intersil
ISL6251HAZ
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
D1
DIODE SCHOTTKY 40V 10A POWERDI5
Diodes Inc.
PDS1040-13
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
1
R16
Resistor, SMD, 0805, 0Ω, 2A, 50mΩ Max
KOA
RK73Z2AT
4
AN1364.0
October 25, 2007
5
Application Note 1364
FIGURE 1. TOP SILK
AN1364.0
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6
Application Note 1364
FIGURE 2. TOP LAYER
AN1364.0
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7
Application Note 1364
FIGURE 3. LAYER 2 GROUND (TOP VIEW)
AN1364.0
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8
Application Note 1364
FIGURE 4. LAYER 3 SIGNAL (TOP VIEW)
AN1364.0
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9
Application Note 1364
FIGURE 5. LAYER 4 GROUND (TOP VIEW)
AN1364.0
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10
Application Note 1364
FIGURE 6. LAYER 5 GND (TOP VIEW)
AN1364.0
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11
Application Note 1364
FIGURE 7. BOTTOM COPPER (BOTTOM VIEW)
AN1364.0
October 25, 2007
12
Application Note 1364
FIGURE 8. BOTTOM SILK SCREEN (BOTTOM VIEW)
AN1364.0
October 25, 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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