ISL9220IRTZ-T [RENESAS]
Switching Charger for 1-Cell and 2-Cell Li-ion Batteries;
| 型号： | ISL9220IRTZ-T |
| 厂家： | 
RENESAS TECHNOLOGY CORP |
| 描述： | Switching Charger for 1-Cell and 2-Cell Li-ion Batteries |
| 文件： | 总15页 (文件大小：735K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATASHEET
ISL9220, ISL9220A
Switching Charger for 1-Cell and 2-Cell Li-ion Batteries
FN6936
Rev 3.00
February 16, 2012
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.
Features
• Highly Integrated Battery Charger IC
• Charges 1- and 2-Cell Li-ion or Li-Polymer Batteries
• Up to 2A Charge Current
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.
• Synchronous Buck Topology with Integrated Power FETs
• 1.2MHz Switching Frequency
A simple charge current programming method is provided.
External resistors program the fast charge and end-of-charge
currents.
• 0.5% Charge Voltage Accuracy
• Programmable Input Current Limit with One External
Resistor
The two status outputs can be used to drive LEDs, or can be
connected to host processor.
• Thermistor Interface for Battery Detection and Temperature
Qualified Charging
A programmable charge timer provides the ability to detect
defective batteries, and provides a secondary method of
detecting charge termination.
• Two Status Outputs
• Programmable Charge Safety Timer
• Short-Circuit and Thermal Protection
• Small 4mmx4mm TQFN Package
• -40°C to +85°C Operating Temperature Range
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.
Related Literature
Applications
• PDAs and Smart Phones
• MP3 and Portable Media Players
• Handheld GPS Devices
• TB363 “Guidelines for Handling and Processing Moisture
Sensitive Surface Mount Devices (SMDs)”
• TB379 “Thermal Characterization of Packaged
Semiconductor Devices”
• Digital Still Cameras
• TB389 “PCB Land Pattern Design and Surface Mount
Guidelines for QFN Packages”
• Industrial Handheld Scanners
• AN1589, “ISL9220IRTZEVAL1Z (1-cell),
ISL9220AIRTZEVAL1Z (2-cell) Evaluation Board”
Pin Configuration
ISL9220, ISL9220A
(20 LD TQFN)
TOP VIEW
STAT2
EN
PGND
SW
1
2
3
4
5
15
14
13
12
11
AGND
ISET1
ISET2
SW
PAD
(AGND)
VHI
VIN
FN6936 Rev 3.00
February 16, 2012
Page 1 of 15
ISL9220, ISL9220A
Pin Descriptions
PIN
SYMBOL
DESCRIPTION
1
STAT2
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.
2
EN
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.
3
4
5
AGND
ISET1
ISET2
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.
6
7
VBAT
ISNS
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 . No decoupling capacitor is needed at
BAT
this pin.
8
9
CISP
CISN
VIN
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.
10, 11
12
VHI
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.
13, 14
15, 16
17
SW
Switch node and inductor connection pin.
Power ground.
PGND
VBIAS
Internal 5V regulator output. Connect a 0.1µF ~ 4.7µF ceramic capacitor from this pin to AGND. A typical 1µF ceramic
capacitor is recommended.
18
19
RTH
Input for an external NTC thermistor for battery temperature monitoring.
TIME
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.
20
STAT1
EPAD
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.
Ordering Information
PACKAGE
Tape & Reel
(Pb-free)
PART NUMBER
NUMBER
OF CELLS
TEMP. RANGE
(°C)
PKG.
DWG. #
(Notes 1, 2, 3)
PART MARKING
ISL9220IRTZ-T
92 20IRTZ
1
1
2
2
-40 to +85
-40 to +85
-40 to +85
-40 to +85
20 Ld 4x4 TQFN
L20.4x4E
ISL9220IRTZ-T7A
ISL9220AIRTZ-T
ISL9220AIRTZ-T7A
ISL9220IRTZEVAL1Z
ISL9220AIRTZEVAL1Z
NOTES:
92 20IRTZ
20 Ld 4x4 TQFN
20 Ld 4x4 TQFN
20 Ld 4x4 TQFN
L20.4x4E
L20.4x4E
L20.4x4E
922 0AIRTZ
922 0AIRTZ
Evaluation Board
Evaluation Board
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.
FN6936 Rev 3.00
February 16, 2012
Page 2 of 15
ISL9220, ISL9220A
Absolute Maximum Ratings
Thermal Information
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
Thermal Resistance (Typical)
JA (°C/W)
40
JC (°C/W)
4x4 QFN Package (Notes 4, 5) . . . . . . . .
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
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
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
(Tested per JESD-78B; Class 2 (+85°C), Level A) . . . . . . . . . . . . . 100mA
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. is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
JA
Brief TB379.
5. , “case temperature” location is at the center of the exposed metal pad on the package underside.
JC
Electrical Specifications Typical specifications are measured at the following conditions: T = +25°C; For ISL9220, V = 5V;
A
IN
For ISL9220A, V = 12V.
IN
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
POWER-ON RESET
Rising V Threshold
IN
V
3.4
2.2
3.6
2.4
3.8
2.6
V
V
POR_R
Falling V Threshold
IN
V
POR_F
V
- V OFFSET VOLTAGE
IN BAT
Rising Offset Threshold
V
ISL9220
ISL9220A
ISL9220
ISL9220A
mV
mV
mV
mV
OS_R
-
95
170
65
150
-
300
Falling Offset Threshold
V
OS_F
10
20
-
-
130
SUPPLY CURRENT
VIN Pin Supply Current
PGOOD = TRUE, EN = L (Note 6)
PGOOD = TRUE, EN= (Note 6)
I
10
-
15
mA
mA
CC(VIN)
0.5
H
-
-
V
= 5V to 12V
IN
Battery Discharge Current
(Total of currents flowing into VBAT, ISNS,
SW pins)
I
VIN < V
EN =
2
5
µA
POR OR
H
DIS
2V < V
< 11V
BAT
OVERVOLTAGE PROTECTION
Input OVP Rising Threshold
Input OVP Falling Threshold
OUTPUT CURRENT
V
14.5 15.0 15.5
14.0 14.5 15.0
V
V
IN_OVPR
V
IN_OVPF
Fast Charge Current Accuracy
I
RSNS = 0.039Ω
RISET1 = 49.9kΩ (Nominal I
-10
-35
-
-
-
10
35
-
%
%
CHG
= 1000mA)
= 100mA)
OUT
Charge Termination Current Accuracy
I
MIN
RSNS = 0.039Ω
RISET2 = 300kΩ (Nominal I
MIN
Charge Termination Detection Deglitch
Time
12
ms
FN6936 Rev 3.00
February 16, 2012
Page 3 of 15
ISL9220, ISL9220A
Electrical Specifications Typical specifications are measured at the following conditions: T = +25°C; For ISL9220, V = 5V;
A
IN
For ISL9220A, V = 12V. (Continued)
IN
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
25
TYP
50
MAX
90
UNITS
mA
Level 1 Pre-Charge Current Range (Linear
mode)
I
V
< V
BAT PCHG1
PCHG1
Level 2 Pre-Charge Current Accuracy
I
RSNS = 0.039Ω
-
±20
-
%
PCHG2
RISET2 = 300kΩ (Nominal I
= 140mA)
PCHG
Level 1 Pre-Charge Threshold Voltage
V
V
ISL9220
2.42
4.8
2.5
5.0
3.0
6.0
2.56
5.3
V
V
V
V
PCHG1
PCHG2
ISL9220A
Level 2 Pre-Charge Threshold Voltage
ISL9220
2.9
3.1
ISL9220A
5.75
6.25
RECHARGE THRESHOLD
Recharge Voltage Threshold
V
ISL9220
3.85
7.75
4.0
8.0
4.1
V
V
RECHG
ISL9220A
8.25
TEMPERATURE MONITORING
High Battery Temperature Threshold
Low Battery Temperature Threshold
Battery Removal Threshold
V
Specified as % of V
Specified as % of V
Specified as % of V
30
70
90
-
35
75
40
%
%
TMIN
BIAS
BIAS
BIAS
V
80
TMAX
V
95
-
-
-
%
RMV
Thermistor Disable Threshold
Temperature Threshold Hysteresis
V
V
250
180
mV
mV
T_DIS
-
-
T,HYS
Temperature Detection Deglitch Time
THERMAL PROTECTION
Thermal Shutdown Threshold
Thermal Hysteresis
12
-
ms
T
-
-
140
30
-
-
°C
°C
FD
T
HYS
VBIAS OUTPUT
Output Voltage
V
5.3 < V < 15V, I
IN
= 5mA
4.70
-
5.0
-
5.25
5
V
BIAS
VBIAS
Output Current
I
5.3 < V < 15V
IN
mA
BIAS
OSCILLATOR
Oscillation Period
t
C
= 15nF
-
3.0
-
ms
OSC
TIME
SWITCHING CHARGER AC CHARACTERISTICS
Switching Frequency
F
1.02
1.2
96
0
1.38
MHz
%
OSC
Maximum Duty Cycle
D
-
-
-
-
-
-
MAX
Minimum Duty Cycle
D
%
MIN
Cycle-By-Cycle Current Limit
SWITCHING CHARGER DC CHARACTERISTICS
I
3.0
A
LIM
High-Side MOSFET ON-Resistance
r
, HS1
-
-
112
224
-
m
m
DS(ON)
Combined High Side ON-Resistance
(Note 7)
r
, HS2 Measured between V and SW pins
IN
450
DS(ON)
Low-Side MOSFET ON-Resistance
High-Side Path Reverse Leakage Current
Charger Output Voltage
r
, L
DS(ON)
-
-
72
180
5.0
m
µA
V
I
V
= 0V, VSW = 15V
1.0
REV
IN
V
ISL9220, I
= 100mA, T = +25°C
4.179 4.2 4.221
8.358 8.4 8.442
4.158 4.2 4.242
8.316 8.4 8.484
CHG
OUT
ISL9220A, I
A
= 100mA, T = +25°C
V
OUT
A
ISL9220, I
= 100mA
V
OUT
ISL9220A, I
= 100mA
V
OUT
FN6936 Rev 3.00
February 16, 2012
Page 4 of 15
ISL9220, ISL9220A
Electrical Specifications Typical specifications are measured at the following conditions: T = +25°C; For ISL9220, V = 5V;
A
IN
For ISL9220A, V = 12V. (Continued)
IN
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
INPUT CURRENT SENSE AMPLIFIER
Input Bias Current at CSIP and CSIN, Pin
(Charger Enabled)
I
EN =
-
100
100
200
112
µA
L
ISIP_ON
Input Current Limit Threshold
I
CSIP-CSIN
88
mV
IN_LIM
OUTPUT CURRENT SENSE AMPLIFIER
Input Bias Current at ISNS Pin,
(Charger Enabled)
I
EN =
EN =
EN =
EN =
-
-
-
-
100
200
1
µA
µA
µA
µA
L
ISNS_ON
Input Bias Current at ISNS Pin,
(Charger Disabled)
I
-
75
-
H
L
ISNS_OFF
Input Bias Current at VBAT Pin,
(Charger Enabled)
I
100
1
VBAT_ON
Input Bias Current at VBAT Pin,
(Charger Disabled)
I
H
VBAT_OFF
LOGIC INPUT AND OUTPUTS
EN Pin Logic High
1.3
-
-
-
-
-
0.4
-
V
V
EN Pin Logic Low
-
10
-
STAT1, STAT2 Sink Current When ON
STAT1, STAT2 Leakage Current When OFF
NOTES:
Pin Voltage = 0.4V
Pin Voltage = 4.2V
mA
µA
1
6. PGOOD is defined as when V and V
IN BAT
meet all these conditions: V > VPOR, V - V
IN IN BAT
> VOS, V < V
IN
.
IN(OVP)
7. Limits should be considered typical and are not production tested.
FN6936 Rev 3.00
February 16, 2012
Page 5 of 15
ISL9220, ISL9220A
Typical Application Diagrams
1-Cell Application
VBIAS
1µF
VHI
SW
0.1µF
10µH
4.5V TO 14V
AC
ADAPTER
VIN
50m
ISL9220
ISNS
CISN
40m
VBAT
10µF
CISP
VBIAS
1-CELL
LI+
RTH
BATTERY
STAT1
STAT2
ISET1
ISET2
TIME
EN
2-Cell Application
VBIAS
0.1µF
VHI
SW
0.1µF
10µH
9V TO 14V
50m
AC
ADAPTER
VIN
ISL9220A
ISNS
CISN
CISP
40m
10µF
VBAT
VBIAS
2-CELL
LI+
RTH
BATTERY
STAT1
STAT2
ISET1
ISET2
TIME
EN
FN6936 Rev 3.00
February 16, 2012
Page 6 of 15
ISL9220, ISL9220A
Block Diagram
GATE
DRIVE
REF1V
VREF
VREF AND BIAS
GENERATION
1µF
VBIAS
VIN
RICS
4.7µF
CISN
CISP
INPUT
CURRENT
SENSE AMP
VHI
SW
VREF
VBAT
CELLS
0.1µF
PWM
CONTROLLER
CHGEN
ISET1
ISET2
CHG
CURR
PROG
PGND
10µH
ISNS
OUTPUT
CURRENT
SENSE AMP
Rsns
VBAT
CHGEN
PRECHG
PGOOD
EN
CELLS
DISABLE
ENABLE
V_BATTERY
COMPARATORS
VBIAS
10µF
OVFAULT
EOCQUAL
GOFAST
OVFAULT
EOCQUAL
GOFAST
CONTROL
LOGIC
AND
CHARGE
STATE
MACHINE
VBIAS
BATPRES
NOTHERM
TEMPOK
RTH
RTH
STAT1
STAT2
BATPRES
NOTHERM
TEMPOK
COMPARATORS
1-CELL
OR
2-CELL
LI+
BATTERY
TIME
TIMERST
TIMERST
SUSPEND
TIMEOUT
CHG TIMER
SUSPEND
TIMEOUT
AGND
FN6936 Rev 3.00
February 16, 2012
Page 7 of 15
ISL9220, ISL9220A
Typical Operating Conditions
CH4 = INDUCTOR CURRENT (500mA/DIV)
CH4 = INDUCTOR CURRENT (500mA/DIV)
CH1 = SW(5V/DIV)
CH1 = SW(5V/DIV)
FIGURE 2. PWM WAVEFORM IN TRICKLE MODE
FIGURE 1. PWM WAVEFORM IN CC MODE
95
90
85
80
75
70
95
V
= 8.2V
BAT
V
= 3.6V
BAT
90
85
80
75
70
V
= 7V
V
= 4V
BAT
BAT
V
= 6V
V
= 3V
BAT
BAT
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
CHARGE CURRENT (A)
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
CHARGE CURRENT (A)
FIGURE 4. EFFICIENCY vs LOAD 2-CELL (V = 12V, L = 10µH
IN
FIGURE 3. EFFICIENCY vs LOAD 1-CELL (V = 5V, L = 10µH)
IN
FN6936 Rev 3.00
February 16, 2012
Page 8 of 15
ISL9220, ISL9220A
Theory of Operation
VBIAS
VBIAS
RTH
The ISL9220, ISL9220A is an integrated charger optimized for
charging 1-cell and 2-cell Li-ion or Li-polymer batteries. It charges
a battery with constant current (CC) and constant voltage (CV)
profile. The typical charge profile is illustrated in Figure 5.
R1
BATTERY
REMOVAL
VRMV
RU
CP1
CP2
-
R2
R3
+
UNDER
TEMP
VTMIN
-
To RTH
Pin
PRECHG
CC
CV
OFF
+
BATTERY
VOLTAGE
Q1
RT
OVER
TEMP
R4
R5
CP3
-
VTMAX
+
CHARGE
CURRENT
Q2
AGND
EOC
DETECTION
FIGURE 6. THERMISTOR INTERNAL CIRCUIT
TYPICAL CHARGE PROFILE
FIGURE 5. TYPICAL CHARGE PROFILE
VTMIN (4.0V)
TMIN- (3.5V)
V
RTH PIN
VOLTAGE
POR and Power-Good
The ISL9220, ISL9220A resets itself when V undergoes
IN
transition from below V
POR
to above V
threshold.
POR
VTMAX+ (2.0V)
V
TMAX (1.5V)
The ISL9220, ISL9220A has an internal PGOOD signal. Charging
is prohibited if PGOOD statement is not true. See Note 6 in the
“Electrical Specifications” table for the definition of PGOOD.
0V
UNDER
TEMP
Valid Charge Temperatures
An external NTC thermistor can be used to provide temperature-
OVER
TEMP
qualified charging. The V
supply is used as reference for the
BIAS
internal comparators. Thus, it is important that the V
FIGURE 7. THRESHOLD VOLTAGES FOR 0°C to +50°C WINDOW
(V = 5.0V)
supply
BIAS
BIAS
also be used to bias the external voltage divider comprised of
one or more fixed resistors and the thermistor. This scheme
allows the use of a wide variety of thermistors. The RTH
comparator block monitors the RTH pin voltage to determine if
the battery temperature is within safe charging limits.
Battery Detection
The presence or absence of the external thermistor is used to
detect a battery.
When V
RTH
is greater than V , i.e. when the RTH pin is not
RTH,PRES
The ISL9220, ISL9220A uses two comparators (CP2 and CP3) to
form a window comparator, as shown in Figure 6. When the NTC
connected to ground, battery detection is provided by the RTH
comparator block, as shown in Figure 6. With no battery connected, the
RTH pin is pulled to V by R , and thus V will exceed the
pin voltage is “out of the window,” determined by the V
and
TMIN
, the ISL9220, ISL9220A stops charging and indicate a
BIAS RTH
U
V
TMAX
V
threshold. The internal battery presence signal is
RTH,NOBAT
suspend condition. When the temperature returns to the set range,
the charger resumes charging. The two MOSFETs, Q1 and Q2,
produce hysteresis for both upper and lower thresholds. The
temperature window is shown in Figure 7 for a 0°C to +50°C
typical application using an industry standard type 103AT
thermistor.
deglitched with a 12ms deglitcher, to avoid false indication of battery
insertion or removal due to contact bounce or other noises.
Battery Precharge
When the charger is first enabled and no fault conditions are
detected, if the battery connecting to the charger is deeply
discharged, the charger will charge the battery in a reduced
current for the battery to recover.
The temperature qualification function can be disabled by
connecting the RTH pin to ground.
If the battery voltage is less than the level 1 pre-charge voltage
(V
), the charger operates in LDO mode, with an output current
PCHG1
fixed at 50mA typical. In this mode, the output voltage can go to 0V. This
provides the ability to recover a battery that has entered a safety-circuit
undervoltage fault mode.
FN6936 Rev 3.00
February 16, 2012
Page 9 of 15
ISL9220, ISL9220A
Charge Termination
I
= 50mA
(EQ. 1)
PCHG1
Charge current is continuously monitored. When the current falls
below the taper current threshold, charging will stop, and BATFUL
is asserted to indicate a successful charge completion. This taper
current threshold is programmed by a single external resistor
between ISET2 and ground as calculated in Equation 7.
If battery voltage is between the level 1 pre-charge voltage
(V ) and level 2 pre-charge voltage (V ), the charger
operates in trickle mode, and uses the precharge current limit.
This precharge current is programmed by the resistor between
the ISET2 pin and ground. Note that this resistor also programs
the end-of-charge taper current threshold.
PCHG1 PCHG2
1170
--------------------------------------
(EQ. 7)
I
=
mA
EOC
R
R
SNS
ISET2
1638
(EQ. 2)
--------------------------------------
I
=
mA
PCHG2
R
R
SNS
Where R
is in k and RSNS is in
ISET2
ISET2
A secondary charge termination method is provided via the
safety timer. The timeout period of this timer is programmable
via a single external capacitor between the TIME pin and ground.
Where R
is in k and R
SNS
is in
ISET2
When the battery voltage exceeds the level 2 pre-charge voltage
threshold (V ), fast charging will commence. If this
threshold is not reached within the precharge timer period, a
TIME-OUT-FAULT condition is asserted, and the charger is
disabled.
PCHG2
To disable the charge safety timer, short the TIME pin to ground.
Charge Current Sensing
Charge current is sensed with an external current sense resistor.
A low-inductance, precision resistor should be used for accurate
charge current.
Charge Safety Timer
An internal oscillator establishes a timing reference. The
oscillation period is programmable with an external capacitor at
Input Current Sensing
the TIME pin, C
, as shown in the “Typical Application
Time
Diagrams” on page 6. The oscillator charges the timing capacitor
to 1.5V and then discharges it to 0.5V in one period, both with
Input current is sensed with an external sense resistor. A low-
inductance, precision resistor should be used for accurate input
current limit.
10µA current. The period t
is calculated in Equation 3:
OSC
6
(EQ. 3)
The ISL9220, ISL9220A limits the battery charge current when
the input current limit threshold is exceeded. This allows the
most efficient use of AC-adapter power without overloading the
adapter output.
t
= 0.2 10 C
Sec
OSC
Time
Where C
is in F
Time
A 1nF capacitor provides 0.2ms oscillation period. The allowable
range of C value is 100pF to 1µF, providing a programmable
charge safety-timeout range of about 1.4 minutes to almost 10
days.
An internal amplifier compares the voltage between CSIP and
CSIN, and reduces the output current when this differential
voltage exceeds the threshold voltage. The effective input current
Time
limit threshold is thus set by the value of the R
resistor as
ICS
calculated by Equation 8.
0.1
Total charge time, excluding any time required for precharge, is
limited to a length of TIMEOUT. This can be calculated as
Equation 4:
(EQ. 8)
-----------
I
=
A
INLIM
R
ICS
(EQ. 4)
22
Where R
ICS
is in .
TIMEOUT = 2 t
Sec
OSC
A low pass filter is suggested to eliminate the switching noise, as
shown in the “Typical Application Diagrams” on page 6.
Total charge time for battery precharge is limited to a length of
1/8 TIMEOUT. This can be calculated as Equation 5:
(EQ. 5)
19
Status Outputs
TIMEOUTPCHG = 2 t
Sec
OSC
TABLE 1. STAT1 AND STAT2 TRUE TABLE
The TIME pin can be grounded to disable the safety timer
functions if not needed.
STAT1
STAT2
CHARGING CONDITION
Precharge, or fast charge in progress
Charge Complete
L
L
L
H
L
Fast Charge
The fast charge current is programmed by the resistor between
H
H
Fault
the ISET1 pin and ground, and by the value of the R
resistor
SNS
H
Suspend
(see Equation 6).
1946
(EQ. 6)
--------------------------------------
I
=
mA
CHG
R
R
SNS
ISET1
Where R
is in k and R
is in
ISET1
SNS
For best accuracy, select a R
value that provides between
SNS
40mV to 80mV differential voltage across R
maximum peak current (DC plus ripple).
at the desired
SNS
FN6936 Rev 3.00
February 16, 2012
Page 10 of 15
ISL9220, ISL9220A
STAT1 and STAT2 are configured to indicate various charging
conditions as given in Table 1.
Inductor and Output Capacitor Selection
To achieve better steady state and transient response, ISL9220,
ISL9220A typically uses a 10µH inductor. The peak-to-peak inductor
current ripple can be expressed in Equation 9:
A fault status is triggered under one of these conditions:
1. V
> VOUT_OVP threshold
BAT
V
BAT
------------
2. Timeout occurs before the EOC current has been reached
V
1 –
BAT
(EQ. 9)
V
IN
To exit the fault mode, the input power has to be recycled, or the
EN pin is toggled to HI and back to LO.
----------------------------------------------
I =
L f
S
In Equation 9, usually the typical values can be used but to have
a more conservative estimation, the inductance should consider
the value with worst case tolerance; and for switching frequency
Applications Information
Power-On Reset (POR)
f , the minimum f from the “Electrical Specifications” table on
S
S
The ISL9220, ISL9220A resets itself as the input voltage rises
above the POR rising threshold. The internal oscillator starts to
oscillate, the internal timer is reset, and the charger begins to
charge the battery. The STAT1/2 pins will indicate the operating
condition according to Table 1.
page 3 can be used. A worst case for charge current ripple is
when battery voltage is half of the input voltage.
To select the inductor, its saturation current rating should be at
least higher than the sum of the maximum output current and
half of the delta calculated from Equation 9. Another more
conservative approach is to select the inductor with the current
rating higher than the peak current limit.
Trickle Charge
If the battery voltage is below the trickle charge threshold, the
ISL9220, ISL9220A delivers a small current to charge the battery
until the battery voltage reaches the fast charge threshold value.
There are two trickle charge thresholds. The first threshold,
Another consideration is the inductor DC resistance since it
directly affects the efficiency of the converter. Ideally, the
inductor with the lower DC resistance should be considered to
achieve higher efficiency.
V
, is to pre-charge a deeply discharged battery or short
PCHG1
circuit. The second threshold, V
is for batteries discharged
PCHG2
to a voltage range from 2.5V to 3V. When V
Inductor specifications could be different from different
manufacturers so please check with each manufacturer if
additional information is needed.
is below V
BAT
PCHG1,
the ISL9220, ISL9220A operates as a linear regulator, providing
a 50mA constant current to output. When V reaches V
BAT
PCHG2,
the ISL9220, ISL9220A starts to operate as a switching charger.
The trickle charge current is programmable by RISET2.
For the output capacitor, a ceramic capacitor can be used
because of the low ESR values, which helps to minimize the
output voltage ripple. A typical value of 10µF/10V ceramic
capacitor should be enough for most of the applications and the
capacitor should be X5R or X7R.
Charge Cycle
A charge cycle consists of three charge modes: trickle mode,
constant current (CC) mode, and constant voltage (CV) mode. The
charge cycle always starts with the trickle mode until the battery
Board Layout Recommendations
voltage stays above V
stays below V
MIN
(3.0V typical). If the battery voltage
, the charger stays in the trickle mode. The
The ISL9220, ISL9220A is a high frequency switching charger
and hence the PCB layout is a very important design practice to
ensure a satisfactory performance.
MIN
charger operates in CC mode after the battery voltage is above
. As the battery-pack terminal voltage rises to the final
V
MIN
The power loop is composed of the output inductor L, the output
charge voltage, the CV mode operation begins. Since the battery
terminal voltage is regulated at the constant output voltage in
the CV mode, the charge current begins to drop. After the charge
current drops below the end-of-charge level, which is
programmed by RISET2. The ISL9220, ISL9220A indicates the
end-of-charge (EOC) with STAT1 and STAT2 and terminates the
charge. The following events initiate a new charge cycle:
capacitor C , the SW pin and the PGND pin. It is important to
OUT
make the power loop as small as possible and the connecting
traces among them should be direct, short and wide; the same
practice should be applied to the connection of the VIN pin, the
input capacitor C and PGND.
IN
The switching node of the converter, the SW pin, and the traces
connected to this node are very noisy, so keep the voltage
feedback trace and other noise sensitive traces away from these
noisy traces.
• POR
• A new battery being inserted (detected by RTH pin)
• Recovery from an battery over-temperature fault
• The EN pin is toggled from HI-to-LO
The input capacitor should be placed as close as possible to the
VIN pin. The ground of the input and output capacitors should be
connected as close as possible as well. In addition, a solid ground
plane is helpful for a good EMI performance.
Recharge
After a charge cycle completes at a timeout event, charging is
The ISL9220, ISL9220A employs a thermal enhanced QFN
package with an exposed pad. In order to maximize the current
capability, it is very important that the exposed pad under the
package is properly soldered to the board and is connected to
other layers through thermal vias. More thermal vias and more
prohibited until the recharge condition (V
then the charging restarts with the timer reset to zero.
< VRECHG) is met,
BAT
FN6936 Rev 3.00
February 16, 2012
Page 11 of 15
ISL9220, ISL9220A
copper attached to the exposed pad usually results in better
thermal performance. The exposed pad is big enough for 5 vias
as shown in Figure 8.
FIGURE 8. EXPOSED PAD
Charging Flow Chart
The charging flow chart is shown in Figure 9 The charging starts
with the trickle mode, the ISL9220, ISL9220A charges the
battery in a trickle current. If V
reaches V
before the
BAT
PCHG2
trickle charge timeout interval, the operation will change to CC
mode. When the output voltage reaches the 4.2V final voltage,
the operation will change to CV mode, where the battery is
charged at a constant voltage. If the end-of-charge current is
reached before the timeout interval is elapsed, the operation will
come to charge complete state. The charging is terminated. After
the termination, if the output voltage drops below the recharge
threshold, a recharge starts and the timer is reset to zero.
In the event that the timeout condition is reached before EOC,
the fault mode is entered. The fault mode can also be triggered
by a V
OVP event. To exit the fault mode, the input power has
BAT
to be removed and re-applied, or the EN pin is toggled to HI and
back to LO, then a new cycle starts.
FN6936 Rev 3.00
February 16, 2012
Page 12 of 15
ISL9220, ISL9220A
TIMEOUT BEFORE EOC
FAULT
CHGR = OFF
STAT1 = H
STAT2 = L
POR
VBAT > VOUT_OVP
FROM ANY STATE
POR or EN
TOGGLED
SUSPEND
CHGR = OFF
STAT1 = H
NO
STAT2 = H
EN = 0?
YES
VPOR<VIN<VOV
CHGR = ON
50mA TYP.
(LDO MODE)
NO
VBAT > Vpchg1
?
RESET
SAFETY TIMER
YES
SUSPEND
CHGR = OFF
HALT TIMER
STAT1 = H
STAT2 = H
BATT
CONNECETD
?
SUSPEND
CHGR = OFF
HALT TIMER
STAT1 = H
STAT2 = H
NO
NO
YES
RESUME TIMER
IF STOPPED
TEMP OK
?
YES
NO
TEMP OK?
YES
CHGR = ON
ISET2 SETS
CURRENT
NO
VBAT > Vpchg2
?
YES
RESUME TIMER
IF STOPPED
SUSPEND
CHGR = OFF
HALT TIMER
STAT1 = H
STAT2 = H
FOR ISL9220:
RESUME TIMER IF
STOPPED
NO
YES
RESET
SAFETY TIMER
TEMP OK
?
FOR ISL9220A:
RESET TIMER
CHGR = ON
(FAST CHARGE)
RESET
SAFETY TIMER
NO
NO
YES
VBAT >
VRECHG
?
YES
YES
IBAT < I_EOC
(> 25ms)
?
CHGR = OFF
(FULL)
VBAT < VRECHG
(> 25ms)
?
SUSPEND
CHGR = OFF
HALT TIMER
STAT1 = H
STAT2 = H
NO
NO
TEMP OK
?
YES
RESUME TIMER
IF STOPPED
FIGURE 9. CHARGING FLOW CHART
FN6936 Rev 3.00
February 16, 2012
Page 13 of 15
ISL9220, ISL9220A
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make
sure you have the latest Rev.
DATE
REVISION
CHANGE
December 16, 2011 FN6936.3 Moved the 10µF capacitor at the SW to the VBAT pin in “1-Cell Application” and “2-Cell Application” on page 6.
October 3, 2011
Added AN1589 to “Related Literature” on page 1.
Changed Eval board names in “Ordering information” on page 2 from ISL9220EVAL1Z, ISL9220AEVAL1Z TO
ISL9220IRTZEVAL1Z, ISL9220AIRTZEVAL1Z.
In the “Pin Descriptions” on page 2:
Pin 12, VHI. Changed "Connect a Schottky diode from VBIAS to this pin, and a 0.1mF capacitor to AGND, as shown
in the Typical Application Circuits." to "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.
Pin 17, VBIAS. Changed "Connect a 1µF ceramic capacitor from this pin to AGND." to "Connect a 0.1µF ~ 4.7µF
ceramic capacitor from this pin to AGND. A typical 1µF ceramic capacitor is recommended"
August 11, 2010
July 1, 2010
FN6936.2 Added “Number of Cells” column to “Ordering Information” on page 2.
Corrected input voltage in “2-Cell Application” on page 6 from “4.5V to 14V” to “9V to 14V”
FN6936.1 Changed minimum limit for “IPCHG1” on page 4 from 30 to 25mA.
On page 4, changed "Minimum On-Time" with typical 20ns to “Minimum Duty Cycle” with typical of 0%.
Changed minimum limit for “VPCHG1” on page 4 from 4.85 to 4.80V for only the "A option"
Changed maximum limit for “VPCHG1” on page 4 from 5.25 to 5.3V for only the "A option"
Changed minimum limit for “VPCHG2” on page 4 from 5.80V to 5.75V for only the "A option"
Changed maximum limit for “VPCHG2” on page 4 from 6.2V to 6.25V for only the "A option"
Changed minimum limit for “VRECHG” on page 4 from 7.80V to 7.75V for only the "A option"
Changed maximum limit for “VRECHG” on page 4 from 8.20 to 8.25V for only the "A option"
June 30, 2010
FN6936.0 Initial Release.
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products
address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks.
Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a
complete list of Intersil product families.
For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on
intersil.com: ISL9220, ISL9220A
To report errors or suggestions for this datasheet, please go to www.intersil.com/askourstaff
FITs are available from our website at http://rel.intersil.com/reports/search.php
© Copyright Intersil Americas LLC 2010-2012. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
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FN6936 Rev 3.00
February 16, 2012
Page 14 of 15
ISL9220, ISL9220A
Package Outline Drawing
L20.4x4E
20 LEAD THIN QUAD FLAT NO-LEAD PLASTIC PACKAGE
Rev 0, 4/10
4X 2.00
0.50
4.00
16X
A
6
B
PIN #1
INDEX AREA
16
20
6
PIN 1
INDEX AREA
1
15
11
2 . 60
5
(4X)
0.15
6
10
0.10M C A B
TOP VIEW
20X 0 . 40 ±0.10
4
0.23 +0.07/- 0.05
BOTTOM VIEW
SEE DETAIL "X"
0.10 C
C
0.75
BASE PLANE
SEATING PLANE
0.08 C
SIDE VIEW
( 16X 0 . 50 )
(3.8 TYP)
(
2 . 60 )
5
C
0 . 2 REF
( 20X 0 . 23 )
( 20 X 0 . 60 )
0 . 00 MIN.
0 . 05 MAX.
TYPICAL RECOMMENDED LAND PATTERN
DETAIL "X"
NOTES:
1. Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to ASME Y14.5m-1994.
3.
Unless otherwise specified, tolerance : Decimal ± 0.05
4. Dimension applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
Tiebar shown (if present) is a non-functional feature.
5.
6.
The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
JEDEC reference drawing: MO-229.
7.
FN6936 Rev 3.00
February 16, 2012
Page 15 of 15
相关型号：
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