Switching Charger for 1-Cell and 2-Cell Li-ion Batteries
ISL9220, ISL9220A
The ISL9220, ISL9220A is a cost-effective and versatile battery
charger for 1-cell and 2-cell Li-ion and Li-Polymer based portable
applications.
The device features synchronous PWM technology, maximizing
power efficiency, thus minimizing charge time and heat. The
1.2MHz switching frequency allows use of small external
inductors and capacitors.
A simple charge current programming method is provided.
External resistors program the fast charge and end-of-charge
currents.
The two status outputs can be used to drive LEDs, or can be
connected to host processor.
A programmable charge timer provides the ability to detect
defective batteries, and provides a secondary method of
detecting charge termination.
A thermistor interface is provided for battery presence detection,
and for temperature qualified charging conditions.
Additional features include preconditioning of an over-discharged
battery, automatic recharge, and thermally enhanced QFN
package.
Features
• Highly Integrated Battery Charger IC
• Charges 1- and 2-Cell Li-ion or Li-Polymer Batteries
• Up to 2A Charge Current
• Synchronous Buck Topology with Integrated Power FETs
• 1.2MHz Switching Frequency
• 0.5% Charge Voltage Accuracy
• Programmable Input Current Limit with One External Resistor
• Thermistor Interface for Battery Detection and Temperature
Qualified Charging
• Two Status Outputs
• Programmable Charge Safety Timer
• Short-Circuit and Thermal Protection
• Small 4mmx4mm TQFN Package
• -40°C to +85°C Operating Temperature Range
Related Literature
•
TB363
“Guidelines for Handling and Processing Moisture
Sensitive Surface Mount Devices (SMDs)”
•
TB379
“Thermal Characterization of Packaged Semiconductor
Devices”
•
TB389
“PCB Land Pattern Design and Surface Mount
Guidelines for QFN Packages”
•
AN1589,
“ISL9220IRTZEVAL1Z (1-cell), ISL9220AIRTZEVAL1Z
(2-cell) Evaluation Board”
Applications
• PDAs and Smart Phones
• MP3 and Portable Media Players
• Handheld GPS Devices
• Digital Still Cameras
• Industrial Handheld Scanners
Pin Configuration
ISL9220, ISL9220A
(20 LD TQFN)
TOP VIEW
20
STAT1
17
VBIAS
16
PGND
15
PGND
14
SW
PAD
(AGND)
13
SW
12
VHI
11
VIN
VBAT
6
ISNS
7
CISP
8
CISN
9
VIN
10
19
TIME
STAT2
1
EN
2
AGND
3
ISET1
4
ISET2
5
February 16, 2012
FN6936.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2010-2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
18
RTH
ISL9220, ISL9220A
Pin Descriptions
PIN
1
2
3
4
5
6
7
8
9
10, 11
12
13, 14
15, 16
17
18
19
SYMBOL
STAT2
EN
AGND
ISET1
ISET2
VBAT
ISNS
CISP
CISN
VIN
VHI
SW
PGND
VBIAS
RTH
TIME
DESCRIPTION
Open-drain indication pin. In conjunction with STAT1 this pin provides a unique indication for each charging state of the
cycle. This pin is capable to sink 10mA minimum current to drive an LED.
IC enable input. Drive this pin to logic LO to enable the charger. Drive this pin to logic HI to disable the charger. Do not
leave this pin floating.
Analog ground.
Charge current programing pin. Connect a resistor between this pin and the GND pin to set the charge current.
End-of-charge current programing pin. Connect a resistor between this pin and the GND pin to set the end-of-charge
current.
Battery connection pin. Connect this pin to the battery. A 10µF or larger X5R ceramic capacitor is recommended for
decoupling and stability purposes.
Output current sense pin. Connect a current sense resistor from this pin to V
BAT
. No decoupling capacitor is needed at
this pin.
Input current sense positive connection pin. Connector a sense resistor from this pin the CISN.
Input current sense negative connection pin. Connector a sense resistor from this pin the CISP.
Input supply voltage. Connect a 4.7µF ceramic capacitor from VIN to PGND.
High-side NMOS FET gate drive supply pin. Connect the anode of a Schottky diode to VBIAS pin and the cathode to VHI
pin. Connect a 0.1µF capacitor from VHI pin to SW pin. See “Typical Application Diagrams” on page 6.
Switch node and inductor connection pin.
Power ground.
Internal 5V regulator output. Connect a 0.1µF ~ 4.7µF ceramic capacitor from this pin to AGND. A typical 1µF ceramic
capacitor is recommended.
Input for an external NTC thermistor for battery temperature monitoring.
The TIME pin sets the oscillation period by connecting a timing capacitor between this pin and GND. The oscillator also
provides a time reference for the charger. The timer function can be disabled by connecting the TIME pin to GND. If the
timer is disabled, there will be no timeout function for any operation mode including trickle charge and fast charge
modes.
Open-drain indication pin. In conjunction with STAT2 this pin provides a unique indication for each charging state of the
cycle. This pin is capable to sink 10mA minimum current to drive an LED.
Exposed pad. Connect to GND electrically. Thermally, connect as much as possible copper to this pad either on the
component layer or other layers through thermal vias to enhance the thermal performance.
20
STAT1
EPAD
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL9220IRTZ-T
ISL9220IRTZ-T7A
ISL9220AIRTZ-T
ISL9220AIRTZ-T7A
ISL9220IRTZEVAL1Z
ISL9220AIRTZEVAL1Z
NOTES:
1. Please refer to
TB347
for details on reel specifications.
2. 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL9220, ISL9220A.For
more information on MSL please see techbrief
TB363.
PART MARKING
92 20IRTZ
92 20IRTZ
922 0AIRTZ
922 0AIRTZ
Evaluation Board
Evaluation Board
NUMBER
OF CELLS
1
1
2
2
TEMP. RANGE
(°C)
-40 to +85
-40 to +85
-40 to +85
-40 to +85
PACKAGE
Tape & Reel
(Pb-free)
20 Ld 4x4 TQFN
20 Ld 4x4 TQFN
20 Ld 4x4 TQFN
20 Ld 4x4 TQFN
PKG.
DWG. #
L20.4x4E
L20.4x4E
L20.4x4E
L20.4x4E
2
FN6936.3
February 16, 2012
ISL9220, ISL9220A
Absolute Maximum Ratings
VIN, CISP, CISN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 18V
SW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.7V to 18V
VHI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 24V
VBAT, ISNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 10V
ISET1, ISET2, RTH, VBIAS, STAT1, STAT2, EN . . . . . . . . . . . . . -0.3V to 5.5V
TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.75V
Input Current (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.0A
Output Current (SW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.2A
ESD Rating
Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . . 2500V
Machine Model (Tested per EIA/JESD22-A115-A) . . . . . . . . . . . . . . 175V
Charged Device Model (Tested per JES22-C101D). . . . . . . . . . . . . 1500V
Latch-Up
(Tested per JESD-78B; Class 2 (+85°C), Level A) . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
θ
JA
(°C/W)
θ
JC
(°C/W)
4x4 QFN Package (Notes 4, 5) . . . . . . . .
40
4.3
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . .+150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Supply Voltage, VIN
ISL9220 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5V to 14V
ISL9220A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V to 14V
Programmable Charge Current . . . . . . . . . . . . . . . . . . . . . . . . 200mA to 2A
Programmable Trickle Current . . . . . . . . . . . . . . . . . . . . . . 20mA to 200mA
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4.
θ
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
5.
θ
JC
, “case temperature” location is at the center of the exposed metal pad on the package underside.
Electrical Specifications
For ISL9220A, V
IN
= 12V.
POWER-ON RESET
Rising V
IN
Threshold
Falling V
IN
Threshold
PARAMETER
Typical specifications are measured at the following conditions: T
A
= +25°C; For ISL9220, V
IN
= 5V;
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
V
POR_R
V
POR_F
V
OS_R
ISL9220
ISL9220A
3.4
2.2
3.6
2.4
3.8
2.6
V
V
V
IN
- V
BAT
OFFSET VOLTAGE
Rising Offset Threshold
-
-
10
20
95
170
65
130
150
300
-
-
mV
mV
mV
mV
Falling Offset Threshold
V
OS_F
ISL9220
ISL9220A
SUPPLY CURRENT
VIN Pin Supply Current
I
CC(VIN)
PGOOD = TRUE, EN = L (Note 6)
PGOOD = TRUE, EN= H (Note 6)
V
IN
= 5V to 12V
Battery Discharge Current
(Total of currents flowing into VBAT, ISNS,
SW pins)
I
DIS
VIN < VPOR OR EN = H
2V < V
BAT
< 11V
-
-
10
-
2
15
0.5
5
mA
mA
µA
OVERVOLTAGE PROTECTION
Input OVP Rising Threshold
Input OVP Falling Threshold
V
IN_OVPR
V
IN_OVPF
I
CHG
I
MIN
RSNS = 0.039Ω
RISET1 = 49.9kΩ (Nominal I
OUT
= 1000mA)
RSNS = 0.039Ω
RISET2 = 300kΩ (Nominal I
MIN
= 100mA)
14.5
14.0
15.0
14.5
15.5
15.0
V
V
OUTPUT CURRENT
Fast Charge Current Accuracy
Charge Termination Current Accuracy
Charge Termination Detection Deglitch
Time
-10
-35
-
-
-
12
10
35
-
%
%
ms
3
FN6936.3
February 16, 2012
ISL9220, ISL9220A
Electrical Specifications
For ISL9220A, V
IN
= 12V.
(Continued)
PARAMETER
Level 1 Pre-Charge Current Range (Linear
mode)
Level 2 Pre-Charge Current Accuracy
Level 1 Pre-Charge Threshold Voltage
Typical specifications are measured at the following conditions: T
A
= +25°C; For ISL9220, V
IN
= 5V;
SYMBOL
I
PCHG1
I
PCHG2
V
PCHG1
V
PCHG2
V
BAT
< V
PCHG1
RSNS = 0.039Ω
RISET2 = 300kΩ (Nominal I
PCHG
= 140mA)
ISL9220
ISL9220A
TEST CONDITIONS
MIN
25
-
2.42
4.8
2.9
5.75
TYP
50
±20
2.5
5.0
3.0
6.0
MAX
90
-
2.56
5.3
3.1
6.25
UNITS
mA
%
V
V
V
V
Level 2 Pre-Charge Threshold Voltage
ISL9220
ISL9220A
RECHARGE THRESHOLD
Recharge Voltage Threshold
V
RECHG
ISL9220
ISL9220A
TEMPERATURE MONITORING
High Battery Temperature Threshold
Low Battery Temperature Threshold
Battery Removal Threshold
Thermistor Disable Threshold
Temperature Threshold Hysteresis
Temperature Detection Deglitch Time
THERMAL PROTECTION
Thermal Shutdown Threshold
Thermal Hysteresis
VBIAS OUTPUT
Output Voltage
Output Current
OSCILLATOR
Oscillation Period
SWITCHING CHARGER AC CHARACTERISTICS
Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Cycle-By-Cycle Current Limit
SWITCHING CHARGER DC CHARACTERISTICS
High-Side MOSFET ON-Resistance
Combined High Side ON-Resistance
(Note 7)
Low-Side MOSFET ON-Resistance
High-Side Path Reverse Leakage Current
Charger Output Voltage
r
DS(ON)
, HS1
r
DS(ON)
, HS2
r
DS(ON)
, L
I
REV
V
CHG
V
IN
= 0V, VSW = 15V
ISL9220, I
OUT
= 100mA, T
A
= +25°C
ISL9220A, I
OUT
= 100mA, T
A
= +25°C
ISL9220, I
OUT
= 100mA
ISL9220A, I
OUT
= 100mA
Measured between V
IN
and SW pins
-
-
-
-
4.179
8.358
4.158
8.316
112
224
72
1.0
4.2
8.4
4.2
8.4
-
450
180
5.0
4.221
8.442
4.242
8.484
mΩ
mΩ
mΩ
µA
V
V
V
V
F
OSC
D
MAX
D
MIN
I
LIM
1.02
-
-
-
1.2
96
0
3.0
1.38
-
-
-
MHz
%
%
A
t
OSC
C
TIME
= 15nF
-
3.0
-
ms
V
BIAS
I
BIAS
5.3 < V
IN
< 15V, I
VBIAS
= 5mA
5.3 < V
IN
< 15V
4.70
-
5.0
-
5.25
5
V
mA
T
FD
T
HYS
-
-
140
30
-
-
°C
°C
V
TMIN
V
TMAX
V
RMV
V
T_DIS
V
T,HYS
Specified as % of V
BIAS
Specified as % of V
BIAS
Specified as % of V
BIAS
30
70
90
-
-
-
35
75
95
250
180
12
40
80
-
-
-
-
%
%
%
mV
mV
ms
3.85
7.75
4.0
8.0
4.1
8.25
V
V
4
FN6936.3
February 16, 2012
ISL9220, ISL9220A
Electrical Specifications
For ISL9220A, V
IN
= 12V.
(Continued)
PARAMETER
INPUT CURRENT SENSE AMPLIFIER
Input Bias Current at CSIP and CSIN, Pin
(Charger Enabled)
Input Current Limit Threshold
OUTPUT CURRENT SENSE AMPLIFIER
Input Bias Current at ISNS Pin,
(Charger Enabled)
Input Bias Current at ISNS Pin,
(Charger Disabled)
Input Bias Current at VBAT Pin,
(Charger Enabled)
Input Bias Current at VBAT Pin,
(Charger Disabled)
LOGIC INPUT AND OUTPUTS
EN Pin Logic High
EN Pin Logic Low
STAT1, STAT2 Sink Current When ON
STAT1, STAT2 Leakage Current When OFF
NOTES:
6. PGOOD is defined as when V
IN
and V
BAT
meet all these conditions: V
IN
> VPOR, V
IN
- V
BAT
> VOS, V
IN
< V
IN(OVP)
.
7. Limits should be considered typical and are not production tested.
Pin Voltage = 0.4V
Pin Voltage = 4.2V
1.3
-
10
-
-
-
-
-
-
0.4
-
1
V
V
mA
µA
I
ISNS_ON
I
ISNS_OFF
I
VBAT_ON
I
VBAT_OFF
EN = L
EN = H
EN = L
EN = H
-
-
-
-
100
-
75
-
200
1
100
1
µA
µA
µA
µA
I
ISIP_ON
I
IN_LIM
EN = L
CSIP-CSIN
-
88
100
100
200
112
µA
mV
Typical specifications are measured at the following conditions: T
A
= +25°C; For ISL9220, V
IN
= 5V;
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
5
FN6936.3
February 16, 2012
stm32/stm8
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