Application Note 1589
2
February 9, 2012
AN1589.2
Quick Setup Guide
1. Insert shunts on left two pins of H6, H5 for normal operation
and H4 to disable timeout if needed.
2. Connect power supply (PS1) in series with a current meter (I1)
to connector IN+.
3. Connect power supply (PS2) in series with a current meter (I2)
to VBAT pin of J2.
4. Connect electronic load (E-load) setting at 2.2A to VBAT pin
and ground.
5. Connect a voltage meter (V2) on TP6 to measure voltage on
VBAT.
6. Place a scope probe on the connector of TP14 to monitor
switching waveform.
7. Set input supply PS1 voltage between 4.5V to 14V for 1-cell
charge and 9V to 14V for 2-cell charge.
8. Set PS2 so that V2 measures 3.6V on VBAT for 1-cell and 7V
for 2-cell.
9. Turn on PS1. LED2 will turn on red indicating power good.
10. Turn on PS2 and E-load. LED1 will turn on green indicating
charging in progress.
11. Without shunts on JP8 and JP9, current meter I2 will measure
500mA ±10% charge current.
12. Insert a shunt on JP8. The resistance on the ISET1 pin
becomes 33.3k
Ω
and I2 will measure 1.5A±10% charge
current.
13. Insert shunt on JP9. The resistance on the ISET1 pin becomes
25k
Ω
and I1 will measure 2A±10% charge current.
14. Lower the voltage on PS2 until V2 measures 2.5V for 1-cell
and 5V for 2-cell. The charger will become trickle mode. I2 will
measure around 70mA trickle charge current.
15. Insert a shunt on JP10. I2 will measure around 140mA trickle
charge current. For Steps 11 to 15, you should see 1.2MHz
switching waveform on the scope.
16. Lower the voltage on PS2 until V2 measures less than 2.5V for
1-cell and less than 5V for 2-cell. The charger will charge in
LDO mode current. I2 will measure around 50mA LDO
current. The charge stops switching in this mode.
17. Slowly increase the voltage on PS2; the charge current into the
PS2 reduces. As current continues to reduce and reaches
around 100mA, the end-of-charge event happens and the
charger stops charging. At this point, V2 should measure 4.2V,
±1% for 1-cell and 8.4V, ±1% for 2-cell. STAT1 toggles high, and
LED2 turns off. Remove the shunt from JP10, the end-of-charge
current changes to 50mA.
18. Charging efficiency can be calculated by
(V
O
*I
O
)/(V
IN
*I
IN
)*100. The voltage and current can be read
from V1, I1, V2 and I2.
FIGURE 2. ISL9220, ISL9220A EVALUATION BOARD SCHEMATIC
L1
10µH
ISET2
ISET1
STAT1
VBIAS
0.039
Ω
1%
SW
ISNS
VBAT
RTH
TIME
C12
15nF/50V
R12
10k
Ω
1%
R13
10k
Ω
1%
C5
0.1µF/50V
R8
100k
Ω
C2
10µF/25V
R10
600k
Ω
C6
1.0µF/6.3V
TP19
TP3
TP20
TP1
TP2
TP18
TP10
TP11
TP8
TP12
TP14
TP16
TP13
TP6
TP7
TP9
TP5
TP4
1
2
H5
1
2
3
H6
LED1
LED2
R3
2k
Ω
R4
2k
Ω
VBIAS
VBIAS
VBIAS
VBIAS
1
2
3
J2
VBAT
R5
RTH
C3
0.1µF/25V
1
2
H3
ISET1
1
2
J1
VIN
1210
COILTRONICS
DR73-100-R
DCR = 66m
Ω
I
SAT
= 2.47A
D1
BAT54T1
UNLESS OTHERWISE NOTED:
1. ALL RESISTORS AND CAPACITORS ARE 0603 SIZE
2. ALL CAPACITORS ARE X7R TYPE
3. ALL RESISTORS ARE 1% TOLERANCE
C7
10µF/16V
1210
1
2
H2
ISET2
1
2
H1
C1
OPEN
1210
1
2
H4
STAT2
R2
22
R1
0.03
Ω
C4
10nF/50V
CISN
CISP
1210
R11
0
R7
1000k
Ω
R6
50k
Ω
JP8
JP9
R9
600k
Ω
JP10
STAT1
20
STAT2
1
TIME
19
AGND
3
CISN
9
EN
2
RTH
18
VIN
11
VIN
10
VBIAS
17
VHI 12
SW
14
SW
13
15
16
VBAT
6
ISNS
7
CISP
8
ISET2
5
ISET1
4
EP
AD
ISL9220
PGN
D
PGN
D
R16
R17
0
0
