an1061

ISL6253EVAL1B Evaluation Board
Setup Procedure
®
May 2004
Application Note
AN1061.1
General Description
Features
The ISL6253EVAL1B EV kit includes all the circuitry needed
to demonstrate the capabilities of the ISL6253 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.
• ±0.5% Voltage Accuracy from -10°C to +100°C
The ISL6253 charger IC controls a high efficiency 300kHz
fixed-frequency DC/DC synchronous-rectifier buck-converter.
The battery charger employs a current-limited voltageclamped regime while simultaneously protecting the system
AC adapter power source from an overcurrent event. If the AC
adapter output approaches the user selectable current limit,
the battery charger output will automatically foldback to the
extent that the AC adapter output current remains compliant.
Once the demand on the AC adapter subsides, the battery
charger output will resume normal operation.
• Trickle Charge Mode 10% of Battery Charger Current
Limit when Battery Voltage is Less than 3.0V per Cell
• AC Adapter Present Indicator
• DC Adapter Present Indicator
• Controls P-CH MOSFET Power Source Isolation Switch
• Controls P-CH MOSFET Battery Isolation Switch
• Pb-free Available
Pinout
ACSET
VDD
DCIN
DCPRN
ACPRN
CSON
ISL6253HRZ (28 LD 5X5 QFN)
TOP VIEW
28
27
26
25
24
23
22
EN
1
21
CSOP
CELLS
2
20
CSIN
ICOMP
3
19
CSIP
VCOMP
4
18
SGATE
ICM
5
17
BGATE
VREF
6
16
PHASE
CHLIM
7
15
UGATE
L28.5x5
NOTE:
8
9
10
11
12
13
14
BOOT
28 Ld 5x5 QFN
(Pb-free)
PKG.
DWG. #
• AC Adapter Output Current Monitor
VDDP
-10 to 100
PACKAGE
• 150°C Thermal Shutdown Protection
LGATE
ISL6253HRZ
(Note 1)
TEMP.
RANGE (°C)
• Efficient Light Load Diode Emulation Mode
PGND
PART #
• High Efficiency 300kHz Synchronous Buck Rectifier
GND
Ordering Information
• Input Voltage Range 7V to 25V
VADJ
The ISL6253 has two general purpose 1.26V voltage
comparator inputs DCSET and ACSET, that control open
drain outputs DCPRN and ACPRN. The ICM pin provides a
0V to 2V output signal that is proportional to the AC adapter
output current.
• Selectable 2, 3, or 4 Series Cell Battery Packs
DCSET
The ISL6253 is capable of controlling two P-CH MOSFET
isolation switches SGATE and BGATE, that replace diodes
typically used for this purpose. The SGATE pin controls a
switch that prevents the battery from back-feeding into the
system input power source as is possible when an AC adapter
remains connected to the system while de-energized. The
BGATE pin controls a switch that provides a low impedance
discharge path between the battery and the system power bus
when the AC adapter is unavailable; otherwise the switch is
open, isolating the battery from the input power source.
• ±4% Battery Charger Current Limit Accuracy
ACLIM
The AC Adapter current limit (ACLIM), battery charger current
limit (CHLIM), and output voltage limit (VADJ) are programmed
by applying the appropriate voltage relative to the GND pin.
Each of these three parameters may be independently
programmed by connecting to one of the three built-in settings.
The three built-in settings are chosen by connecting ACLIM,
CHLIM, and VADJ to either VREF, GND, or floating.
• ±3% AC Adapter Current Limit Accuracy
1. Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin
plate termination finish, which is 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-020B.
2. Add “-T” for Tape and Reel.
1
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1061
What’s Inside
This Evaluation Board Kit contains the following materials:
• Qty(1) ISL6253EVAL1B Evaluation Board
• Qty(1) ISL6253EVAL1B Setup Procedure
What is Needed
The following materials are recommended to perform
testing:
• One adjustable 25V 6A power supply
Step 3: Select the Battery Charger Current Limit
(Table 3)
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
• Two adjustable 6A constant current electronic loads
• Two DVMs
• Four passive oscilloscope voltage probes
• Two 10ADC Current Probes
• One Signal generator
Jumper Selection Guide
Step 1: Select the Number of Cells (Table 1)
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.
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 2. JUMPER JP6 FUNCTIONS
SHUNT
LOCATION
VADJ
PIN
BATTERY
VOLTAGE CHANGE
PER CELL
1 to 3
Through R20 to VREF
+1%
3 to 5
To GND
-5%
5 to 6
Floating
None
3 to 4
Through R20 To R24 Wiper Adjustable between or R19/R21
5% to +1%
2
100%
CONSTANT
CURRENT
100% CURRENT
CHLIM PIN
SHUNT
FEEDBACK
JUMPER CONNECTED
CSOP TO CSON
TO:
LOCATION
• One 500MHz four channel oscilloscope
Removed
[email protected]
127mV
5.08A
1-3
VREF
100mV
4.00A
Removed
Floating
65mV
2.60A
3-5
GND
30mV
1.20A
3-4
R22 or R6/R7
30mV to 127mV
1.20A to 5.08A
Step 4: Select the AC Adapter Current Limit (Table 4)
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 4. JUMPER JP5 FUNCTIONS
SHUNT
JUMPER
LOCATION
ACLIM PIN
CONNECTED
TO:
100% CURRENT
FEEDBACK
CSIP TO CSIN
100%
ADAPTER
CURRENT
1-3
VREF
103mV
5.15A
Removed
Floating
78mV
3.90A
3-5
GND
53mV
2.65A
3-4
R23 or R17/R18
53mV to 103mV
2.65A to
5.15A
Interface Connections
The input power source connects to header H1. Positive
input power “+” connects to H1 pin 1, “+” SNS (if used)
connects to H1 pin 2, “-” SNS (if used) connects to H1 pin 3,
and “-” input power connects to H1 pin 4. The battery
charger output connects to header H3. Positive battery
charger output “+” connects to H3 pin 1, “+” SNS (if used)
connects to H3 pin 2, “-” SNS (if used) connects to H3 pin 3,
and “-” battery charger output connects to H3 pin 4. The
system output connects to header H2. Positive system
output “+” connects to H2 pin 1, “+” SNS (if used) connects
to H2 pin 2, “-” SNS (if used) connects to H2 pin 3, and “-”
system output connects to H2 pin 4.
3
Application Note 1061
FIGURE 1. SCHEMATIC
Application Note 1061
TABLE 5. 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, 28P, QFN, -10°C to +100°C
Intersil
ISL6253HR
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
Q3, Q4
MOSFET, P-CH, 8P, SOIC, -30V, -17A, 0.0075Ω
Siliconix
SI4405DY
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
4
1
1
4
1
4
1
FIGURE 2. TOP SILK AND ASSEMBLY
4
Application Note 1061
2 4 6 2 4 6
1 3 5 1 3 5
5
2 4 6
1 3 5
3 2 1
6
Application Note 1061
FIGURE 3. BOTTOM SILK AND ASSEMBLY
7
Application Note 1061
FIGURE 4. TOP
8
Application Note 1061
FIGURE 5. L2 GND
9
Application Note 1061
FIGURE 6. L3 SIGNAL
10
Application Note 1061
FIGURE 7. L4 GND
11
Application Note 1061
FIGURE 8. L5 GND
12
Application Note 1061
FIGURE 9. BOTTOM
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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