an1361

ISL6252AEVAL1Z Evaluation Board
Setup Procedure
®
Application Note
October 25, 2007
AN1361.0
Low Cost Multi-Chemistry Battery
Charger Controller
Features
The ISL6252, ISL6252A 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.
• ±3% Accurate Input Current Limit
• ±0.5% Charge Voltage Accuracy (-10°C to +100°C)
The constant output voltage can be selected for 2-, 3- and 4series 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 ISL6252, ISL6252A
provides outputs that are used to monitor the current drawn
from the AC adapter, and monitor for the presence of an AC
adapter. The ISL6252, ISL6252A automatically transitions
from regulating current mode to regulating voltage mode.
Ordering Information
PART
NUMBER
(Note)
ISL6252HRZ*
ISL6252AHRZ* ISL6252 AHRZ
• ±25% Accurate Battery Trickle Charge Current Limit
(ISL6252A)
• 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
• 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
TEMP
RANGE
(°C)
PART
MARKING
ISL 6252HRZ
• ±3% Accurate Battery Charge Current Limit
PACKAGE
(Pb-Free)
PKG.
DWG. #
-10 to +100 28 Ld 5x5 QFN L28.5×5
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistant)
Pinout
-10 to +100 28 Ld 5x5 QFN L28.5×5
ISL6252, ISL6252A
(28 LD QFN)
TOP VIEW)
1
ACSET
VDD
DCIN
NA
ACPRN
CSON
28
27
26
25
24
23
22
20
CSIN
ICOMP
3
19
CSIP
VCOMP
4
18
NA
ICM
5
17
NA
VREF
6
16
PHASE
CHLIM
7
15
UGATE
8
9
10
11
12
13
14
BOOT
2
VDDP
CELLS
LGATE
CSOP
PGND
21
GND
1
VADJ
EN
ACLIM
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.
NA
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel
specifications.
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 1361
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) ISL6252EVAL1Z 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
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
• Two DVMs
• One 500MHz four channel oscilloscope
• Four passive oscilloscope voltage probes
• Two 10ADC Current Probes
100%
CONSTANT
CURRENT
1-3
VREF
120mV
4.80A
Removed
Floating
0V
0A
• One signal generator
3-5
GND
0V
0A
Jumper Selection Guide
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
CELLS PIN
CONNECTED
TO:
NUMBER OF
CELLS
CONNECTED
IN SERIES
100%
CONSTANT
OUTPUT
VOLTAGE
1-2
VDD
4
16.8
2-3
GND
3
12.6
Removed
Floating
2
8.4
Step 2: Select the Cell Trim Voltage (Table 2)
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.
TABLE 4. JUMPER JP5 FUNCTIONS
SHUNT
JUMPER
LOCATION
ACLIM PIN
CONNECTED
TO:
100% CURRENT
FEEDBACK
CSIP TO CSIN
100%
ADAPTER
CURRENT
1-3
VREF
100mV
5.15A
Removed
Floating
75mV
3.90A
3-5
GND
50mV
2.65A
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
PIN#
1
2
CONNECT TO
“+” INPUT POWER
“+” SENSE (if used)
3
“-” SENSE (if used)
4
“-” INPUT POWER
1
“+” SYSTEM LOAD OUTPUT
2
“+” SENSE (if used)
SHUNT
JUMPER
LOCATION
VADJ
PIN
BATTERY VOLTAGE
CHANGE PER CELL
1-3
To VREF
+5%
3
“-” SENSE (if used)
4
“-” SYSTEM LOAD OUTPUT
1
“+” BATTERY CHARGER OUTPUT
2
“+” SENSE (if used)
3
“-” SENSE (if used)
4
“-” BATTERY CHARGER OUTPUT
3-5
To GND
-5%
5-6
Floating
None
3-4
R24 Wiper or
R19/R21
Adjustable between -5% to +5%
2
H2
System Load
Output
H3
Battery Charger
Output
AN1361.0
October 25, 2007
ISL6252AEVAL1Z Schematic
AC ADAPTER
C16
NOT POPULATED
18
C12
H2
0.1UF
1
2
3
4
1X4
NOT POPULATED
2
C10
ACSET
0.1UF
JP17
1 2
TP27
TP26
1
0
R26
2
R11
10.2K
DCSET
R10
JP12
Q5
NOT POPULATED
R13
1 2
1
10.5K
0.020
JP13
12
NDS352AP
3
R8
TP15
130K
R9
TP12
0.1UF
1
2
3
4
1X4
100K
C11
H1
SYSTEM
R2
D1
DCIN
TP25
JP7
JP14
1 2
R27
C3
JP15
1 2
0
VDD
C8
IRF7811AV
5
6
7
8
JP9
1 2
LGATE
CHLIM_ADJ
R6
DNP
JP4
1 2
34
56
TP7
R22
20K
JP5
1 2
34
56
R17
ACLIM_ADJ
10K
R29
NOT POPULATED
R30
TP14
NOT POPULATED
TP23
NOT POPULATED
R24
50K
R7
TP20
R20
33.2K
R12
L1OUT
R23
20K
BATTERY
H3
0.1UF
C14
NOT POPULATED
R28
22UF
C13
0.01UF
51
C15
22UF
R1
0.025
C1
R25
Q2
L1
15UH
0
1
NOT POPULATED
TP8
NOT POPULATED
R21
JP6
1 2
34
56
R19
TP5
VADJ_ADJ
TP21
4
3
2
1
TP24
TP19
VADJ_LIM
2.2
CSIN
BGATE
1
10UF
JP10
1 2
FDS6612A
C9
0
P4
R18
2
TP11
UGATE
NOT POPULATED
ACLIM
TP18
4.7
VADJ
TP17
R15
CHLIM
TP10
VDDP
1
VREF
1 2 2
JP11
PHASE
15
BOOT
3
D2
CELLS
TP4
16
R16
2.2UF
1
17
BAT54WT1
C2
TP1
4
3
2
1
UGATE
1 2 2
JP8
5
6
1
7
8
CHLIM
EP
JP1
TP2
18
BOOT_CUR 0.1UF
PHASE
1
19
8
9
10
11
12
13
14
29
ISL6252AHRZ
20
SGATE
BGATE
VREF
Q1
21
NOT POPULATED
0.01UF
7
U1
VCOMP
ICM
10K
C7
100PF
R14
C6
C5
6800PF
100K
R3
TP16
VCOMP
EN
6
CSIN
CSIP
ACLIM
VADJ
GND
PGND
LGATE
VDDP
BOOT
4
5
JP3
12
DCSET
ACSET
VDD
DCIN
DCPRN
ACPRN
CSON
28
27
26
25
24
23
22
SGATE
CSIP
CSOP
100K
EN
ICM
3
CSOP
TP29
TP28
1
2
3
4
1X4
Application Note 1361
ICOMP
TP13
EN
CELLS
ICOMP
Q4
2
C4
1UF
8
7
6
5
1
TP9
SI4835BDY
TP6
JP16
1 2
1
2
3
4
DCPRN
H4
1
2
3
1X3
1 2 2
0.1UF
TP3
1
2
3
4
1X4
1
ACPRN
100K
3
R4 DCIN PULLUP
JP2
12
R5
TP22
AN1361.0
October 25, 2007
Application Note 1361
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
ISL6252HR
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
Q5
MOSFET, P-CH, 3P, SOT23, -30V, -0.9A, 0.5Ω
Fairchild
NDS352AP
2
D1
POWER SCOTTKY DIODE, 10A, 40V
Diodes Inc.
PDS1040
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
AN1361.0
October 25, 2007
5
Application Note 1361
FIGURE 1. TOP SILK
AN1361.0
October 25, 2007
6
Application Note 1361
FIGURE 2. TOP LAYER
AN1361.0
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7
Application Note 1361
FIGURE 3. LAYER 2 GROUND (TOP VIEW)
AN1361.0
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8
Application Note 1361
FIGURE 4. LAYER 3 SIGNAL (TOP VIEW)
AN1361.0
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9
Application Note 1361
AN1361.0
October 25, 2007
FIGURE 5. LAYER 4 GROUND (TOP VIEW)
10
Application Note 1361
FIGURE 6. LAYER 5 GND (TOP VIEW)
AN1361.0
October 25, 2007
11
Application Note 1361
FIGURE 7. BOTTOM COPPER (BOTTOM VIEW)
AN1361.0
October 25, 2007
12
Application Note 1361
FIGURE 8. BOTTOM SILK (BOTTOM VIEW)
AN1361.0
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