an1415

Application Note 1415
ISL9221EVAL1Z Evaluation Board Application Manual
Description
Quick Setup Guide (Refer to Figure 1)
The ISL9221EVAL1Z is an evaluation tool for the ISL9221
single-cell Li-ion battery charger. The evaluation tool provides a
complete evaluation platform addressing all datasheet
specifications and functionality. The jumpers on the board
facilitate the programming of the charge current, different
charging conditions, and can be used to make other necessary
connections, such as current measurement.
DO NOT APPLY POWER UNTIL STEP 6
For VDC Input:
Step 1:
Connect a 5V supply PS1 to VDC input (J1, upper
+) with the current limit set at 1.3A
Step 2:
Connect a 3.5V supply PS3 to BAT output (J3,
upper +) with the current limit set at 1.3A
Step 3:
Connect a current meter to JP8 as shown in
Figure 1
Step 4:
Connect the DC electronic load of 1.2A to BAT (J3,
upper +)
Step 5:
Insert a jumper shunt on JP1, all other jumper
shunts are not installed
Step 6:
Turn on Power Supplies and DC electronic load,
adjust the power supply PS3 such that the
voltmeter V2 reads 3.5V
• Both Inputs Accept Voltage up to 28V
Step 7:
• Flexible Power Connectors Each with a Hook and a Solder
Pad Providing Variety to Users
Both the red and the green LEDs should be on,
indicating power-on and charging condition
Step 8:
The current meter I2 should read about 0.28A as
the charging current
Step 9:
Insert a jumper shunt on JP6 and the current
meter I2 should read about 0.55A charging
current
Step 10:
Insert a jumper shunt on both JP6 and JP7, the
current meter I2 should read about 1.0A charging
current
Step 11:
Reduce the voltage at PS3 to 2.0V for trickle
charge currents. Repeat steps 8, 9 and 10. The
current reading should be 50mA, 100mA and
180mA for steps 8, 9 and 10, respectively
Step 12:
Slowly reduce the DC electronic load current until
the green LED turns off, the current meter I2
should read about 55mA EOC current
Step 13:
Insert a jumper shunt on JP3 and repeat Step 12,
the current meter I2 should read 75mA EOC
current
The ISL9221 is a dual input, fully integrated single-cell Li-ion
battery charger. The ISL9221 charger accepts two input
sources: one from a USB port and the other from a desktop
cradle. Both inputs accept input voltages ranging from 4.5V up
to 28V. Due to the high voltage capability, the components
associated with the input supply on the evaluation board are
good for a 28V supply.
The ISL9221 adds an additional feature in providing a limited
amount of current to system architecture while protecting the
system from destructively high voltage.
Key Features
• A Complete Evaluation Platform for the ISL9221 Charger
• USB Port On-Board Accepts Power Directly From USB Cable
• Convenient Jumpers for Programming the Charge Current,
Charge Mode and for Current Measurement
• 3.5x2.5 Square Inches Board Size Handy for Evaluation
• Thermal Vias in the Thermal Pad Similar To Customers’
Thermally Enhanced Environment
• On-Board LEDs for Input PPR and CHG State Indication
• RoHS compliant
What is Needed
The following instruments will be needed to perform testing:
• Power supplies:
- PS1: DC 30V/2A
- PS2: DC 10V/2A
- PS3: DC 10V/2A
• DC Electronic load: 20V/2A
• Multimeters
For USB Input:
• Oscilloscope
Step 1:
Connect a 5V supply PS2 to USB with the current
limit set at 0.7A.
Step 2:
Connect a 3.5V supply PS3 to BAT (J3 upper +)
with the current limit set at 0.7A.
• Cables and Wires
November 7, 2013
AN1415.1
1
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Application Note 1415
Step 3:
Connect the DC electronic load of 0.6A to BAT
(upper +).
Step 9:
Insert a jumper shunt on JP4. The current meter I2
should read about 0.232A charging current.
Step 4:
Connect a current meter to JP8 as shown in
Figure 1.
Step 10:
Step 5:
Insert a jumper on JP2, all other jumper shunts
are not installed.
Insert a jumper shunt on both JP4 and JP5. The
current meter I2 should read about 0.35A
charging current.
Step 11:
Reduce the voltage at PS3 to 2.0V for trickle
charge current. Repeat step 9, 10, 11. The reading
should be around 20mA, 42mA and 63mA for
steps 9, 10 and 11, respectively.
Step 12:
Slowly reduce the electronic load current until the
green LED turns off, the current meter I2 should
read about 55mA EOC current.
Step 13:
Insert a jumper shunt on JP5 and repeat Step 10.
The current meter I2 should read 75mA EOC
current.
Step 6:
Turn on power supplies and DC electronic load and
adjust the power supply PS3, such that the
voltmeter V2 reads 3.5V.
Step 7:
Both the red and the green LEDs should be on,
indicating power-on and charging condition.
Step 8:
The current meter I2 should read about 0.116A
charging current.
I2
I1
PS1
PS3
-
+
+
+
-
E-load
PS2
-
-
+
FIGURE 1. CONNECTION OF EQUIPTMENT
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Application Note 1415
Description of Jumper Settings
JP1 - A shunt installed on JP1 connects the input source from
connector J1 to the circuit if input current measurement is not
needed. The shunt can be replaced by a current meter if input
current measurement is needed, as shown in Figure 1.
JP2 - A shunt installed on JP2 connects the input source from
the USB port connector to the USB pin if a USB port is used for
the evaluation.
JP3 - Parallels an additional 27.4k resistor to the IMIN pin
(total RIMIN = 7.33k), such that the End-of-Charge Current will
be increased to 75mA (RIMIN is 10k and the EOC current is
55mA without the shunt).
JP4 - Parallels an additional 59k resistor to the IUSB pin (total
RIVDC = 29.4k), such that the cradle charge current will be
increased to 0.232A (RIUSB is 59k and the charge current is
0.115A if the shunts on both JP4 and JP5 are removed).
JP5 - Parallels an additional 59k resistor to the IUSB pin (total
RIUSB = 29.4k), such that the cradle charge current will be
increased to 0.232A (RIUSB = 59k and the charge current is
0.115A if the shunts on both JP4 and JP5 are removed;
RIUSB= 19.7k and the charge current is 350mA if the shunts
on both JP4 and JP5 are installed).
JP6 - Parallels an additional 24.9k resistor to the IIVDC pin
(total RIVDC = 12.5k), such that the VDC charge current will be
increased to 0.55A (RIVDC is 24.9k and the charge current is
0.28A if the shunts on both JP6 and JP7 are removed).
JP7 - Parallels an additional 15k resistor to the IIVDC pin (total
RIVDC = 9.36k), such that the VDC charge current will be
increased to 0.73A (RIVDC = 24.9k and the charge current is
0.28A if the shunts on both JP6 and JP7 are removed;
RIVDC= 6.8k and the charge current is 1A if the shunts on both
JP6 and JP7 are installed.)
TABLE 1. JUMPER SETTING SUMMARY
JUMPER
POSITION
FUNCTION
JP1
Shunt installed Connects input source at J1 to VDVC pin.
JP2
Shunt installed Connects input source from USB port
connector to VUSB pin.
JP3
Shunt installed Sets VDC and USB EOC current to 75mA.
JP4
Shunt installed Sets USB charge current to 0.232A if JP5
is not installed.
JP5
Shunt installed Sets USB charge current to 0.232A if JP4
is not installed.
JP6
Shunt installed Sets VDC charge current to 0.55A, if shunt
on JP7 is not installed.
JP7
Shunt installed Sets VDC charge current to 700mA if JP6
is not installed.
JP8
Shunt installed Connects J3 to VBAT pin.
JP9
Shunt installed Connects cathode of D3 to anodes of D4
and D5 to obtain zener voltage regulation
if shunt on JP11 is not installed.
JP10
Shunt installed 3-pin jumper. Installing shunt on the left 2
pins connects EN pin to HI. Installing shunt
on the right 2 pins connecting EN pin to
LOW.
JP11
Shunt installed Connects cathodes of D1 and D2 to
collector of Q1 to obtain voltage
regulation circuitry (consisting of zener
and bipolar transistor) if shunt on JP9 is
not installed.
JP8 - A shunt installed on JP6 connects the BAT pin to the
output connector J3 if output current measurement is not
needed. The shunt can be replaced by a current meter if output
current measurement is needed, as shown in Figure 1.
JP9, JP11 - If Install shunt on JP9 and remove shunt on JP11,
voltage at the anodes of D4 and D5 is 4.3V. If Install shunt on
JP11 and remove shunt on JP9, voltage at the anodes of D4
and D5 is 3.5V
JP10 - Connects the EN pin to a pull-up voltage or GND. The
pull-up voltage is regulated 3.3V from the input source (either
VDC or USB). If there is no shunt installed on JP3, the EN pin is
internally pulled down to logic LOW, which enables the charger.
If a shunt is installed across the two jumper pins labeled as
“Enable”, the EN pin is driven to logic LOW, the charger is
enabled, same as floating. If the shunt is installed across the
two jumper pins labeled as “Disable”, the EN pin is driven to
logic HIGH, which disables the charger.
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Application Note 1415
Board Design
Schematic
J1
1
2
C7
4 . 7 u F 35 V
J P1
J2
1
2
D1
R2
JP 2
1
D2
C1
4 . 7 u F, 3 5V
R1
4 9 .9
J P1 1
C2
0 .1 u F
C3
0 .1 u F
Q1
C4
0 .1 u F
C 5
0 .1 u F
C6
0 .1 u F
1
V DC _ BY P
JP 9
D4
1
D5
U S B _B YP
4 .3 V
U1
1
2
3
4
5
6
D3
R 3
470
R 4
470
J P1 0
VD C
VU S B
P PR
CH G
EN
IM I N
V DC _L D O
V BA T
U S B_ BY P
IVD C
G ND
IUS B
J P8
1 2
1 1
1 0
9
8
7
1
2
J P6
IS L 9 22 1
JP 4
JP 3
R7
59K
R6
1 0K
J P7
C9
10uF
JP 5
R 10
2 4 .9 K
R5
2 7 .4 K
J3
R8
5 9K
R 11
2 4 .9 K
C1 0
47uF
R 12
15K
R 9
5 9K
ISL9221EVAL1Z Bill of Materials
ITEM
QTY
1
1
U1
ISL9221 Charger
DFN-12
ISL9221
Intersil
2
2
D1, D2
Switching diode, 100V, 250mA
SOD-523
CMOD4448
Central
Diodes
3
1
D4
Green LED
805
SML-LXT0805GW-TR
Lumex
4
1
D5
Red LED
805
SML-LXT0805IW-TR
Lumex
5
1
Q1
60V, 1A, NPN Transistor
SOT-23
FMMT491TA
Zetex
6
2
J1, J3
2.54mm Center Header, 2CKT
22-11-2022
Molex
7
1
J2
Type B, Female USB
787780-1
Amp/Tyco
8
9
JP1, JP2, JP3,JP4, JP5,
2.54mm Header, 2CKT
22-28-4020
Molex
22-28-4030
Molex
9
REFERENCE
PART DESCRIPTION
FOOTPRINT
USB-TypeB
PART NUMBER
VENDOR
JP6, JP7, JP8, JP9, JP11
10
1
JP10
2.54mm Header, 3CKT
11
3
C2, C3, C4
0.1µF, 50V, X7R Ceramic
402
TDK
12
2
C5, C6
0.1µF, 50V, X7R Ceramic
805
Panasonic
13
1
C9
10µF, 6.3V Tantalum
1206
Panasonic
14
1
R5
27.4k, 1% SMD resistor
805
Panasonic
15
1
R6
10k, 1% SMD resistor
402
Panasonic
16
2
R11, R12
24.9k, 1% SMD resistor
805
Panasonic
17
1
R10
24.9k, 1% SMD resistor
402
Panasonic
18
1
R1
3.3k, 5% SMD resistor
805
Panasonic
19
1
D3
4.3V, 200mA
SOD-323
20
1
C7
4.7µF 35V
2512
Panasonic
21
1
C1
4.7µF, 35V
2512
Panasonic
22
2
R3, R4
470
805
Panasonic
23
1
C10
47µF, 6.3V, X5R, Ceramic
1210
Panasonic
4
MMSZ5229BS
Diodes
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Application Note 1415
ISL9221EVAL1Z Bill of Materials
ITEM
QTY
24
1
C20
Open
1205
25
1
R2
1, 5% SMD resistor
805
Panasonic
26
1
R7
59k, 1% SMD resistor
402
Panasonic
27
2
R8, R9
59k, 1% SMD resistor
805
Panasonic
28
3
VDC, VUSB, VBAT
Test point, Red
5010
Keystone
29
7
PPR, CHG, Enable, IUSB
Test point, Yellow
5014
Keystone
30
31
REFERENCE
(Continued)
PART DESCRIPTION
FOOTPRINT
PART NUMBER
IVDC, VDC_BYP, USB_BYP
4
GND
VENDOR
Keystone
Test point, Black
5011
Keystone
PCB Layout
FIGURE 1. SILK LAYER
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Application Note 1415
PCB Layout
(Continued)
FIGURE 2. TOP LAYER
FIGURE 3. BOTTOM LAYER
=
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
6
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