Renesas ISL9205D Li-ion battery charger Datasheet

DATASHEET
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Li-ion Battery Charger
FN9252
Rev 3.00
September 30, 2016
The ISL9205, ISL9205A, ISL9205B, ISL9205C, and ISL9205D
are integrated single-cell Li-ion or Li-polymer chargers capable
of operating at an input voltage as low as 2.5V. The low
operating voltage allows the charger to work with a variety of
AC adapters.
Features
The ISL9205 family operates as a linear charger when the AC
adapter is a voltage source. The battery is charged in a
standard Li-ion charge profile, i.e., a Constant Current phase
followed by a Constant Voltage phase (CC/CV). The charge
current during the Constant Current phase is determined by
the external resistor connected to the IREF pin. When the
adapter output is a current-limited voltage source and the
current limit is smaller than the programmed constant current
of the IC, the ISL9205 operates as a pulse charger where the
charge current is determined by the current limit of the AC
adapter during the Constant Current phase. The ISL9205
operates in a linear mode during the constant voltage phase in
both adapter cases.
• Low component count and cost
The ISL9205 family incorporates Thermaguard, which protects
the IC against over-temperature. If the die temperature rises
above a typical value of +100°C, the thermal foldback
function reduces the charge current to prevent further
temperature rise. The ISL9205 includes an external
temperature monitoring function (not available in some
package options). A Negative Temperature Coefficient (NTC)
thermistor is connected between the TEMP pin and GND to
monitor the battery or ambient temperature. The ISL9205 also
includes a timer to set the time reference for various charge
time limits. The timer is programmable with an external
capacitor. Two logic inputs and two open-drain logic outputs
are available for controlling the charger and indicating the
charger status. The EN pin enables the charger. The TOEN pin
(available in ISL9205) enables the timeout function so that the
charge is terminated when the preset time limits have been
reached. The FAULT pin is an open-drain output which turns on
when a fault condition is encountered. The STATUS pin is also
an open-drain output which turns on when the charger is
delivering current.
• NTC interface (not available in some package options)
FN9252 Rev 3.00
September 30, 2016
• Complete charger for single-cell Li-ion/polymer batteries
• Integrated pass element and current sensor
• No external blocking diode required
• 25mV voltage accuracy over-temperature and input voltage
range
• 15mV voltage accuracy at room temperature
• Programmable charge current
• Programmable end-of-charge current (ISL9205)
• Charge current thermal foldback for thermal protection
(Thermaguard)
• Trickle charge for fully discharged batteries
• Power presence and charge indications
• Less than 3µA leakage current off the battery when no input
power attached or charger disabled
• Ambient temperature range: -40°C to +85°C
• DFN, QFN packages
• Pb-Free (RoHS compliant)
Applications
• Mobile phones
• Bluetooth devices
• PDAs
• MP3 players
• Stand-alone cradle or travel chargers
• Other handheld devices
Related Literature
• For a full list of related documents, visit our website
- ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
product pages
Page 1 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP.
RANGE (°C)
VBAT (V)
VSEN
TEMP
TIMEOUT
PACKAGE
(RoHS COMPLIANT)
PKG
DWG. #
ISL9205IRZ
DLBA
-40 to +85
4.2
Yes
Yes
Yes
16 Ld 3x3 QFN
L16.3x3B
ISL9205AIRZ
DLCA
-40 to +85
4.2
Yes
No
No
10 Ld 3x3 DFN
L10.3x3
ISL9205BIRZ
DLDA
-40 to +85
4.2
Yes
No
Yes
10 Ld 3x3 DFN
L10.3x3
ISL9205CIRZ
DLEA
-40 to +85
4.256
Yes
No
Yes
10 Ld 3x3 DFN
L10.3x3
ISL9205DIRZ
DLFA
-40 to +85
4.2
No
Yes
Yes
10 Ld 3x3 DFN
L10.3x3
NOTES:
1. Add “-T” suffix for “6k” unit tape and reel option. Refer to TB347 for details on reel specifications.
2. Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are 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), see product information page for ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D. For more information
on MSL, see tech brief TB363.
Pin Configurations
ISL9205A, ISL9205B, ISL9205C
(10 LD DFN)
TOP VIEW
13 VBAT
14 VBAT
15 VIN
16 VIN
ISL9205
(16 LD QFN)
TOP VIEW
3
8
IREF
3
TIME
4
9
TIME
4
7
V2P8
GND
5
6
EN
8
STATUS
STATUS
11 TEMP
10 IMIN
V2P8
VSEN
2
7
9
FAULT
EN
2
6
FAULT
5
10 VBAT
12 VSEN
GND
1
1
TOEN
VIN
VIN
IREF
ISL9205D
(10 LD DFN
TOP VIEW
FN9252 Rev 3.00
September 30, 2016
VIN
1
10 VBAT
FAULT
2
9
TEMP
STATUS
3
8
IREF
TIME
4
7
V2P8
GND
5
6
EN
Page 2 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
ISL9205 Pin Descriptions
PIN NUMBER
PIN NAME
1, 15, 16
VIN
DESCRIPTION
2
FAULT
An open-drain output indicating fault status. This pin is pulled to LOW under any fault
condition. When a fault condition occurs, the time counter will be reset. When the
charger is disabled, the FAULT pin outputs high impedance.
3
STATUS
An open-drain output indicating charging and inhibit states. This pin is pulled LOW
when the charger is charging a battery. It will be turned into high impedance when
the charge current drops to IMIN. This high impedance state will be latched until a
recharge cycle or a new charge cycle starts. When the charger is disabled, the
STATUS pin outputs high impedance.
4
TIME
Determines the oscillation period by connecting a timing capacitor between this pin
and GND. The oscillator also provides a time reference for the charger.
5
GND
The connection to system ground.
6
TOEN
TIMEOUT enable input pin. Pulling this pin to LOW disables the TIMEOUT charge-time
limit for the fast charge modes. Leaving this pin HIGH or floating enables the
TIMEOUT limit. There is an internal 400kΩ pull-up resistor at this pin.
7
EN
Enable logic input. Connect the EN pin to LOW to disable the charger or leave it
floating to enable the charger. There is an internal 400kΩ pull-up resistor at this pin.
8
V2P8
A 2.8V reference voltage output. This pin provides a 2.8V voltage source when the
input voltage is above the POR threshold and outputs zero otherwise. The V2P8 pin
can be used as an indication for adapter presence.
9
IREF
Charge current programming and monitoring pin. Connect a resistor between this
pin and GND to set the charge current during the Constant Current phase, as given
by Equation 1:
Input power source. Connect to a wall adapter.
80
I REF = ----------------R IREF
A
(EQ. 1)
Where RIREF is in kΩ.
10
IMIN
End-of-charge (EOC) current programming pin. Connect a resistor between this pin
and GND to set the EOC current, as given by Equation 2:
8000
I MIN = ---------------R IMIN
 mA 
(EQ. 2)
Where RIMIN is in kΩ.
11
TEMP
Input for an external NTC thermistor. The TEMP pin is also used for battery removal
detection.
12
VSEN
The remote voltage sense pin. Connect this pin as close to the battery positive
terminal as possible. If the VSEN pin is left floating, its voltage drops to zero volt and
the charger operates in trickle mode.
13, 14
VBAT
The connection to the battery. Typically a ceramic capacitor of minimum 1µF is
needed for stability when there is no battery attached. When a battery is attached,
only a 0.1µF ceramic capacitor is required.
FN9252 Rev 3.00
September 30, 2016
Page 3 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
ISL9205A/B/C Pin Descriptions
PIN NUMBER
PIN NAME
1
VIN
DESCRIPTION
2
FAULT
An open-drain output indicating fault status. This pin is pulled to LOW under any fault
condition. When a fault condition occurs, the time counter will be reset. When the
charger is disabled, the FAULT pin outputs high impedance.
3
STATUS
An open-drain output indicating charging and inhibit states. This pin is pulled LOW
when the charger is charging a battery. It will be turned into high impedance when
the charge current drops to IMIN. This high impedance state will be latched until a
recharge cycle or a new charge cycle starts. When the charger is disabled, the
STATUS pin outputs high impedance.
4
TIME
Determines the oscillation period by connecting a timing capacitor between this pin
and GND. The oscillator also provides a time reference for the charger.
5
GND
The connection to system ground.
6
EN
Enable logic input. Connect the EN pin to LOW to disable the charger or leave it
floating to enable the charger. There is an internal 400kΩ pull-up resistor at this pin.
7
V2P8
A 2.8V reference voltage output. This pin provides a 2.8V voltage source when the
input voltage is above the POR threshold and outputs zero otherwise. The V2P8 pin
can be used as an indication for adapter presence.
8
IREF
The charge current programming and monitoring pin. Connect a resistor between
this pin and GND to set the charge current during the Constant Current phase, as
given by Equation 3:
Input power source. Connect to a wall adapter.
80
I REF = ----------------R IREF
A
(EQ. 3)
Where RIREF is in kΩ.
9
VSEN
The remote voltage sense pin. Connect this pin as close to the battery positive
terminal as possible. If the VSEN pin is left floating, its voltage drops to zero volt and
the charger operates in trickle mode.
10
VBAT
The connection to the battery. Typically a ceramic capacitor of minimum 1µF is
needed for stability when there is no battery attached. When a battery is attached,
only a 0.1µF ceramic capacitor is required.
FN9252 Rev 3.00
September 30, 2016
Page 4 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
ISL9205D Pin Descriptions
PIN NUMBER
PIN NAME
1
VIN
DESCRIPTION
2
FAULT
An open-drain output indicating fault status. This pin is pulled to LOW under any fault
condition. When a fault condition occurs, the time counter will be reset. When the
charger is disabled, the FAULT pin outputs high impedance.
3
STATUS
An open-drain output indicating charging and inhibit states. This pin is pulled LOW
when the charger is charging a battery. It will be turned into high impedance when
the charge current drops to IMIN. This high impedance state will be latched until a
recharge cycle or a new charge cycle starts. When the charger is disabled, the
STATUS pin outputs high impedance.
4
TIME
Determines the oscillation period by connecting a timing capacitor between this pin
and GND. The oscillator also provides a time reference for the charger.
5
GND
The connection to system ground.
6
EN
Enable logic input. Connect the EN pin to LOW to disable the charger or leave it
floating to enable the charger. There is an internal 400kΩ pull-up resistor at this pin.
7
V2P8
A 2.8V reference voltage output. This pin provides a 2.8V voltage source when the
input voltage is above the POR threshold and outputs zero otherwise. The V2P8 pin
can be used as an indication for adapter presence.
8
IREF
The charge current programming and monitoring pin. Connect a resistor between
this pin and GND to set the charge current during the Constant Current phase, as
given by Equation 4:
Input power source. Connect to a wall adapter.
80
I REF = ----------------R IREF
A
(EQ. 4)
Where RIREF is in kΩ.
9
TEMP
Input for an external NTC thermistor. The TEMP pin is also used for battery removal
detection.
10
VBAT
The connection to the battery. Typically a ceramic capacitor of minimum 1µF is
needed for stability when there is no battery attached. When a battery is attached,
only a 0.1µF ceramic capacitor is required.
FN9252 Rev 3.00
September 30, 2016
Page 5 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Typical Applications
For 3x3 QFN Package Option
5V WALL
ADAPTER
1k
R1
1µF
C1
1k
R2
VIN
VBAT
VIN
VBAT
VIN
1µF
D1
D2
FAULT
STATUS
TOEN
EN
VSEN
1µF
C3
BATTERY
PACK
T
RU
RT
TEMP
IREF
IMIN
RIMIN
V2P8
TIME
V2P8
C2
ISL9205IRZ
GND
RIREF
100k
100k
CTIME
15nF
FIGURE 1. TYPICAL APPLICATION: 3x3 QFN PACKAGE OPTION
For 3x3 DFN Package Option
5V WALL
ADAPTER
VIN
1µF
C1
VBAT
1µF
1k
R1
1k
R2
D1
D2
ISL9205AIRZ
C2
BATTERY
PACK
VSEN
FAULT
STATUS
IREF
EN
V2P8
1µF
C3
TIME
GND
RIREF
100k
CTIME
15nF
FIGURE 2. TYPICAL APPLICATION: 3x3 DFN PACKAGE OPTION
FN9252 Rev 3.00
September 30, 2016
Page 6 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Absolute Maximum Ratings
Thermal Information
Voltage Ratings for All Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.3V to 7V
Charge Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0A
ESD Rating
Human Body Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2kV
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200V
Thermal Resistance
JA (°C/W) JC (°C/W)
3x3 DFN Package (Note 4) . . . . . . . . . . . . .
48
6
3x3 QFN Package (Note 5) . . . . . . . . . . . . .
54
6
Maximum Junction Temperature (Plastic Package). . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . -65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Operating Supply Voltage (VIN Pin) . . . . . . . . . . . . . . . . . . . 4.25V to 6.5V
Programmed Charge Current . . . . . . . . . . . . . . . . . . . . 50mA to 900mA
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
The 150°C maximum junction temperature is for information purposes only. In reality, the current foldback feature will prevent the junction from rising above a worst case
temperature of 125°C.
NOTES:
4. 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. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER
Typical values are tested at VIN = 5V and the ambient temperature at +25°C, unless otherwise noted.
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
3.2
3.6
3.9
V
2.25
2.5
2.7
V
45
80
100
mV
Charger disabled or the input is floating
-
-
3.3
µA
POWER-ON RESET
Rising POR Threshold
VPOR
Falling POR Threshold
VPOR
VBAT = 3.0V, use V2P8 pin to indicate the
comparator output.
VIN-BAT OFFSET VOLTAGE
Rising Edge
VOS
VBAT = 4.2V, IBAT = 20mA, use STATUS pin to
indicate the comparator output (Note 6)
STANDBY CURRENT
BAT Pin Sink Current
ISTANDBY
VIN Pin Supply Current
IVIN
Charger disabled
-
150
250
µA
VIN Pin Supply Current
IVIN
Charger enabled
-
1.0
-
mA
VCH
Tested at 50mA load, 5V input, and +25°C
4.185
4.20
4.215
V
VCH
-40°C < TA < +85°C, 4.3V < VIN < 6.5V
4.175
4.20
4.225
V
VCH
Tested at 50mA load, 5V input, and +25°C
4.241
4.256
4.271
V
VCH
-40°C < TA < +85°C, 4.3V < VIN < 6.5V
4.231
4.256
4.281
V
VOLTAGE REGULATION
Output Voltage (Except ISL9205C)
Output Voltage (ISL9205C)
PMOS ON-Resistance
rDS(ON)
VBAT = 4.0V, charge current = 0.35A
-
500
-
µΩ
Constant Charge Current
ICC
RIREF = 100kΩ, VBAT = 3.0V to 4.0V
760
800
840
mA
Trickle Charge Current
ITRK
RIREF = 100kΩ, VBAT = 0V to 2.5V
64
80
96
mA
End-of-Charge Current
IMIN
RIMIN = 100kΩ (ISL9205)
70
80
90
mA
End-of-Charge Current
IMIN
RIREF = 100kΩ (ISL9205A, ISL9205B, ISL9205C
and ISL9205D)
70
80
90
mA
Load current less than 1mA
2.8
2.9
3.0
V
CHARGE CURRENT (Note 7)
V2P8 PIN OUTPUT
V2P8 Pin Output Voltage
FN9252 Rev 3.00
September 30, 2016
VV2P8
Page 7 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Electrical Specifications
Typical values are tested at VIN = 5V and the ambient temperature at +25°C, unless otherwise noted.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VMIN
2.7
2.8
2.9
V
VMINHYS
50
100
150
mV
-225
-150
-70
mV
VRCHHYS
-
50
-
mV
TFOLD
-
110
-
°C
CHARGE THRESHOLDS
Preconditioning Charge Threshold Voltage
Preconditioning Voltage Hysteresis
Recharge Threshold
Recharge Threshold Hysteresis
VRCH
Referenced to the charger output voltage VCH
INTERNAL TEMPERATURE MONITORING
Charge Current Foldback Threshold
AMBIENT TEMPERATURE MONITORING (ISL9205 and ISL9205D)
High Voltage Threshold
V2P8 = 3.0V
1.98
2.0
2.02
V
High Voltage Threshold Hysteresis
V2P8 = 3.0V
-
1.9
-
V
Low Voltage Threshold
V2P8 = 3.0V
0.99
1
1.01
V
Low Voltage Threshold Hysteresis
V2P8 = 3.0V
-
1.1
-
V
CTIME = 15nF
2.7
3.0
3.3
ms
EN/TOEN Pin Logic Input High
1.3
-
-
V
EN/TOEN Pin Logic Input Low
-
-
0.5
V
200
400
600
k
OSCILLATOR
Oscillation Period
tOSC
LOGIC INPUT AND OUTPUTS
EN/TOEN Pin Internal Pull-Up Resistance
STATUS/FAULT Output Voltage When On
10mA current
-
-
0.8
V
STATUS/FAULT Leakage Current
VSTATUS = 6.5V
-
-
1
A
NOTES:
6. The 4.2V VBAT is selected so that the STATUS output can be used as the indication for the offset comparator output indication. If the VBAT is lower than
the POR threshold, no output pin can be used for indication.
7. The charge current can be affected by the thermal foldback function if the IC under the test setup cannot dissipate the heat.
FN9252 Rev 3.00
September 30, 2016
Page 8 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Typical Operating Performance
4.210
4.210
4.206
4.204
4.202
4.198
VBAT (V)
VBAT (V)
The test conditions for the Typical Operating Performance are: VIN = 5V,
TA = +25°C, RIREF = RIMIN = 100k, VBAT = 3.7V, unless otherwise noted.
4.198
4.192
4.186
4.194
CHARGE CURRENT = 50 mA
4.180
4.190
0.0
0.2
0.4
0.6
0.8
1.0
0
20
40
60
80
100
120
TEMPERATURE (°C)
CHARGE CURRENT (mA)
FIGURE 3. CHARGER OUTPUT VOLTAGE vs CHARGE CURRENT
FIGURE 4. CHARGER OUTPUT VOLTAGE vs TEMPERATURE
4.30
IBAT = 50mA
0.96
4.24
4.18
0.84
IBAT (A)
VBAT (V)
0.90
4.12
0.78
0.72
4.06
0.66
4.00
4.2
0.60
4.5
4.8
5.1
5.4
5.7
6.0
3.0
3.2
VIN (V)
3.4
3.6
3.8
4.0
4.2
VBAT (V)
FIGURE 5. CHARGER OUTPUT VOLTAGE vs INPUT VOLTAGE
CHARGE CURRENT IS 50mA
FIGURE 6. CHARGE CURRENT vs OUTPUT VOLTAGE
1.00
0.86
0.90
0.72
IBAT (A)
CHARGE CURRENT (mA)
0.96
0.58
0.84
0.78
0.72
0.44
0.30
0.66
0
20
40
60
80
100
120
TEMPERATURE (°C)
FIGURE 7. CHARGE CURRENT vs AMBIENT TEMPERATURE
FN9252 Rev 3.00
September 30, 2016
0.60
4.2
4.6
5.0
5.4
5.8
6.2
VIN (V)
FIGURE 8. CHARGE CURRENT vs INPUT VOLTAGE
Page 9 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Typical Operating Performance
2.90
2.90
2.88
2.88
2.86
2.86
VIN (V)
V2P8 (V)
The test conditions for the Typical Operating Performance are: VIN = 5V,
TA = +25°C, RIREF = RIMIN = 100k, VBAT = 3.7V, unless otherwise noted. (Continued)
2.84
2.82
2.80
2.84
2.82
3.5
4.1
4.7
5.3
5.9
2.80
0.0
6.5
2.0
VIN (V)
6.0
8.0
10.0
FIGURE 10. V2P8 OUTPUT vs ITS LOAD CURRENT
1.0
1.20
0.9
1.08
0.8
0.96
rDS(ON) ()
rDS(ON ) (
FIGURE 9. V2P8 OUTPUT vs INPUT VOLTAGE
0.7
0.6
0.5
4.0
V2P8 LOAD CURRENT (mA)
0.84
0.72
0
20
40
60
80
0.60
100
2.9
3.1
3.3
TEMPERATURE (°C)
3.7
3.5
VBAT (V)
3.9
4.1
FIGURE 12. rDS(ON) vs OUTPUT VOLTAGE USING CURRENT
LIMITED ADAPTERS
FIGURE 11. rDS(ON) vs TEMPERATURE AT 3.7V OUTPUT
0.50
0.80
0.70
ENABLED
0.40
ENABLED
0.30
Iq (mA)
Iq (mA)
0.60
DISABLED
0.20
0.50
0.40
0.30
0.10
0.00
DISABLED
0.20
0.10
3.0
3.6
4.8
4.2
5.4
6.0
VIN (V)
FIGURE 13. INPUT QUIESCENT CURRENT vs INPUT VOLTAGE
FN9252 Rev 3.00
September 30, 2016
0
20
40
60
80
100
120
TEMPERATURE (°C)
FIGURE 14. INPUT QUIESCENT CURRENT vs TEMPERATURE
Page 10 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Functional Block Diagram
Q MAIN
VIN
C1
VBAT
ISEN
INPUT_OK
+
CA
-
IR
CURRENT
REFERENCES
V POR
+
-
IREF
VSEN
VIN
+
-
R IREF
V2P8
VRECHRG
IT
V POR
100000:1
CURRENT
MIRROR
V MIN
QSEN
V CH
REFERENCES
TEMPERATURE
MONITORING
-
+
80mV
CHRG
+
VA
-
IMIN = IR/10
V CH
+
TRICKLE/FAST
I SEN
-
MINBAT
VMIN
+
-
VRECHRG
+
MIN_I
-
INPUT_OK
RECHARGE
LOGIC
ESD DIODE
STATUS
EN
STATUS
TEMP
TIME
GND
TEMP
MONITOR
OSC
COUNTER
FAULT
FAULT
FIGURE 15. FUNCTIONAL BLOCK DIAGRAM
FN9252 Rev 3.00
September 30, 2016
Page 11 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Theory of Operation
The ISL9205 family is an integrated charger for single-cell Li-ion
or Li-polymer batteries. The ISL9205 family is capable of
operating in two operation modes, linear charge mode and pulse
charge mode. The ISL9205 family functions as a traditional
linear charger when powered with a voltage source adapter.
When powered with a current-limited adapter, the charger
functions as a pulse charger by fully turning on the pass element,
thereby reducing the power dissipation.
TRICKLE
4.2V
IREF
CC
CV
CHARGE
VOLTAGE
VREC
CHARGE
CURRENT
2.8V
10%IREF
IMIN
Constant Current Phase
The ISL9205 family starts the charge at a Constant Current (CC)
phase. The charge current is regulated to fast charge the battery
before the final voltage has been reached. The charge current is
programmable with the IREF pin and has two operation modes:
trickle mode and Constant Current mode, depending on the
battery voltage. When the battery voltage is lower than 2.8V, the
charger operates in trickle mode where the charge current is set
at 10% of the Constant Current mode current. The trickle mode is
for preconditioning a deeply discharged battery. Once the battery
voltage is above the typical 2.8V threshold, the Constant Current
mode starts. The constant current is programmable between
50mA to 1A.
Constant Voltage Phase
When the battery reaches the final voltage, the ISL9205
switches the operation to a Constant Voltage (CV) phase. The
output voltage is regulated at the final voltage value. During the
Constant Voltage phase, the charge current reduces gradually as
the cell voltage rises.
End-of-Charge and Recharge
As the charge current reaches the End-of-Charge (EOC) current
threshold during the Constant Voltage phase, the STATUS pin
open-drain FET is turned off to indicate an EOC condition. The
EOC current is programmable for the ISL9205 by connecting a
resistor from the IMIN pin to GND. For others, the EOC current is
fixed at 10% of the programmed constant charge current. When
the STATUS pin indicates the EOC condition, the charger will
continue to charge until the EN pin is pulled to logic LOW or the
input power has been removed. After EOC is reached, recharge
will occur when the battery voltage falls to 150mV below the
constant voltage value. The STATUS open-drain FET is turned on
when a recharge condition is met. An internal delay is
implemented at the STATUS pin for both EOC and recharge
conditions to prevent nuisance trips due to noise and fast load
current transitions. The delay time is approximately one clock
cycle (varies between 0.5 and 1.5 clock) of the internal oscillator,
which is programmed by the timer capacitor. The typical charge
waveforms in Figure 16 show the complete cycle operation.
FN9252 Rev 3.00
September 30, 2016
CHG
STATUS
INDICATION
TIME
FIGURE 16. TYPICAL CHARGE CYCLE WITH TIMEOUT
Temperature Monitoring and Thermal
Foldback
In the event the die temperature reaches the thermal foldback
threshold (+110°C typical), the charge current is reduced
accordingly to prevent further temperature rise. In the ISL9205
and ISL9205D versions, there is an external temperature
monitoring function. A Negative Temperature Coefficient (NTC)
thermistor can be connected between the TEMP pin and GND to
monitor the battery temperature or ambient temperature. The
hysteresis comparators internal to the ISL9205 family provide a
valid temperature window centered at the voltage of the TEMP
pin, which is programmed by the NTC and the pull-up resistor
connected to the pin. When the measured temperature is outside
this window, the charger is paused (both the charger and the
timer are stopped) and a fault indication is issued. If the
thermistor is attached to the battery, the TEMP function can be
used to discover a battery removal condition when the TEMP pin
voltage is much higher than the reference threshold.
POR
The Power-on Reset (POR) function monitors the supply voltage.
The POR has a rising edge threshold of 3.6V typical and 2.5V
typical for falling edge. The charger is expected to operate when
the input voltage is above the POR threshold. After POR, the
charger will continue to operate for supply voltage down to 2.5V
typical. It is also required that the supply voltage be higher than
the VBAT pin voltage by a typical 80mV for the charger to
function.
Page 12 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Oscillator, TIMEOUT, and Charge Cycle
The ISL9205 family incorporates an oscillation circuit using an
external timing capacitor connected to the TIME pin. The
oscillator sets the limit for the maximum charge time during the
trickle mode and the fast mode (CC and CV). The maximum
charge time (TIMEOUT) for the fast mode is set by:
TIMEOUT = 222tOSC
where the tOSC is the oscillator period. The minimum
programmable tOSC is 20µs (CTIME = 100pF). The time limit for
the trickle charge is 1/8 of the fast mode time limit. In the
ISL9205 family, the timeout function can be disabled by pulling
the TOEN pin to logic LOW. When TIMEOUT is disabled, the
charger will never be turned off in Constant Current and Constant
Voltage modes. For the ISL9205B and the ISL9105D, the timeout
function is always enforced. For the ISL9105A, there is not
timeout function.
A charge cycle is the time interval between the time when the
charger is enabled to the moment it is disabled. If the battery
voltage is lower than the trickle charge threshold at the time the
charger is enabled, the charger enters the trickle mode and the
timer is reset and its limit is set to 1/8 of TIMEOUT. If the timeout
function is enabled, the charger will stop and indicate a TIMEOUT
fault if the charge time is longer than the limit. If the trickle
mode completes successfully before the time limit, the charger
moves to CC mode and the timer is reset and the time limit is set
to TIMEOUT. The charger needs to reach the EOC conditions
before the TIMEOUT interval elapses, otherwise, a TIMEOUT fault
will be issued. The charger indicates the EOC with the STATUS pin
but does not terminate charging.
Disabling TIMEOUT with TOEN
In the ISL9205 family, the timeout function in fast charge state
(CC/CV) can be disabled by pulling the TOEN pin to logic LOW.
The timeout function for the Trickle Charge mode can not be
disabled. Note that in the ISL9205A, there is no timeout function
for both the trickle and the CC/CV intervals, whereas in the
ISL9205 with TOEN set pulled to LOW, there is no timeout for the
CC/CV interval but the timeout function for the trickle interval is
still enforced.
Indications
The ISL9205 family has two open-drain status indication pins.
These two pins are FAULT and STATUS. These pins require an
external pull-up resistor to function properly. The V2P8 pin can be
used to indicate the presence of an AC adapter. When an adapter
pluses in, V2P8 is at 2.8V (logic Hi), otherwise V2P8 pin is at zero
voltage (logic Lo).
Charger Disable
The EN pin allows the user to disable the charger. When the
charger is disabled, all internal circuits are shut down and the
quiescent current at the input pin is less than a typical value of
150mA.
Remote Battery Voltage Sensing
In the ISL9205, ISL9205A, ISL9205B, and ISL9205C versions, a
kelvin sense pin is provided for battery terminal voltage
monitoring. Thus, the IR drop due to the connection leads and
FN9252 Rev 3.00
September 30, 2016
PCB traces can be eliminated, resulting in a more accurate
battery voltage monitoring, especially when the battery is located
at a significant distance away from the ISL9205. If remote
sensing is not needed, the VSEN pin can be connected to VBAT at
the IC.
Applications Information
PCB Layout Guidance
The ISL9205 family uses thermally-enhanced QFN/DFN
packages that have an exposed thermal pad at the bottom side
of the package. The layout should connect as much as possible
to copper on the exposed pad. Typically, the component layer is
more effective in dissipating heat. The thermal impedance can
be further reduced by using other layers of copper connecting to
the exposed pad through a thermal via array. A minimum of four
such thermal vias are recommended. Each thermal via is
recommended to have 0.3mm diameter and 0.7mm distance
from other thermal vias.
Stability Consideration
The ISL9205 should behave like a current and thermal limited
linear regulator. The charger operation is stable with an output
ceramic decoupling capacitor in the range of 1µF to 200µF, with
or without a battery connected.
Input Bypass Capacitor
Due to the inductance of the power leads of the wall adapter or
USB source, the input capacitor type must be properly selected to
prevent high voltage transient during a hot-plug event. A
tantalum capacitor is a good choice for its high ESR, providing
damping to the voltage transient. Multi-layer ceramic capacitors,
however, have a very low ESR and hence, when chosen as input
capacitor, a 1Ω series resistor must be used to provide adequate
damping, as shown in the “Typical Applications” on page 6.
State Machine Diagram
The state machine diagram is shown in Figure 17. The diagram
starts with the Power-Off state. When the input voltage rises
above the POR threshold, the charger resets itself. Then, if the
charger is disabled, the charger stays in the Charger Disabled
state. If the charger is enabled, the trickle charge starts. At any
time, when entering the trickle charge state, the internal
TIMEOUT timer is reset. There are two paths to exit the trickle
charge, one is when the battery voltage rises above the
preconditioning charge threshold within the 1/8 TIMEOUT
interval, and the other is when the 1/8 TIMEOUT interval has
been elapsed before reaching the preconditioning charge voltage
threshold. When TIMEOUT fault occurs, the charger enters the
TIMEOUT fault state. There are only two ways to exit the TIMEOUT
fault state, by toggling the EN input or re-cycling the input power.
If the charger finishes the trickle charger before the 1/8
TIMEOUT limit, it moves to the fast charge state. When entering
the fast charge state, the TIMEOUT timer is reset as well. If the
charger hits EOC conditions before the TIMEOUT, the charger
enters Charge Compete state. The charger stays on, but the
STATUS indicates EOC condition. When VBAT drops below the
recharge threshold, the STATUS pin will turn to logic low to
indicate charging again.
Page 13 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
PWR OFF
CHARGER: OFF
STATUS: OFF
FAULT: OFF
V IN > V POR
NOT
ENABLED
POR
CHARGER: OFF
STATUS: OFF
FAULT: OFF
CHARGER
DISABLED
CHARGER: OFF
STATUS: OFF
FAULT: OFF
ANYTIME EN PIN
CHANGES TO
DISABLE
TEMP FAULT
REMOVED
ENABLED
TRICKLE
CHARGE
CHARGER: ON
CHARGER: OFF
STATUS: OFF
FAULT: ON
DISABLE
STATUS: OFF
FAULT: ON
V BAT DROPS
BELOW VMIN
TIMEOUT FAULT)
TIMEOUT
CHARGER: OFF
STATUS: ON
FAULT: OFF
TEMP FAULT
ANYTIME A TEMP
FAULT OCCURS
(EXCEPT IN
VBAT < V MIN WHEN 1/8
TIMEOUT COMPLETES
VBAT> VMIN BEFORE 1/8
TIMEOUT COMPLETES
FAST CHARGE
TO CHARGER
DISABLED
BLOCK
CHARGER: ON
STATUS: ON
FAULT: OFF
TIMEOUT
V BAT > VRCH
and I CHG< I MIN
CHARGE
COMPLETE
VBAT < V RCH
CHARGER: ON
STATUS: OFF
FAULT: OFF
FIGURE 17. STATE MACHINE DIAGRAM
FN9252 Rev 3.00
September 30, 2016
Page 14 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted.
Please visit our website to make sure you have the latest revision.
DATE
REVISION
CHANGE
September 30, 2016
FN9252.3
Changed ISL9205 part number throughout to ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D.
Updated entire datasheet applying Intersil’s new standards.
Added Revision History and About Intersil sections.
Edited on page 4 from “Typically a 10µF Tantalum capacitor is needed for stability when there is no battery
attached” to “Typically a ceramic capacitor of minimum 1µF is needed for stability when there is no
battery attached”.
About Intersil
Intersil Corporation is a leading provider of innovative power management and precision analog solutions. The company's products
address some of the largest markets within the industrial and infrastructure, mobile computing, and high-end consumer markets.
For the most updated datasheet, application notes, related documentation, and related parts, see the respective product information
page found at www.intersil.com.
You may report errors or suggestions for improving this datasheet by visiting www.intersil.com/ask.
Reliability reports are also available from our website at www.intersil.com/support.
© Copyright Intersil Americas LLC 2007-2016. 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
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN9252 Rev 3.00
September 30, 2016
Page 15 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Package Outline Drawing
For the most recent package outline drawing, see L16.3x3B.
L16.3x3B
16 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE
Rev 1, 4/07
4X 1.5
3.00
12X 0.50
A
B
6
PIN 1
INDEX AREA
6
PIN #1 INDEX AREA
16
13
12
3.00
1
1 .70
+ 0.10
- 0.15
4
9
0.15
(4X)
5
8
0.10 M C A B
+ 0.07
TOP VIEW
4 16X 0.23 - 0.05
16X 0.40 ± 0.10
BOTTOM VIEW
SEE DETAIL "X"
0.10 C
0 . 90 ± 0.1
C
BASE PLANE
SEATING PLANE
0.08 C
( 2. 80 TYP )
(
1. 70 )
SIDE VIEW
( 12X 0 . 5 )
( 16X 0 . 23 )
C
0 . 2 REF
5
0 . 00 MIN.
0 . 05 MAX.
( 16X 0 . 60)
TYPICAL RECOMMENDED LAND PATTERN
DETAIL "X"
NOTES:
1. Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3. Unless otherwise specified, tolerance : Decimal ± 0.05
4. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
5. Tiebar shown (if present) is a non-functional feature.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 indentifier may be
either a mold or mark feature.
FN9252 Rev 3.00
September 30, 2016
Page 16 of 17
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Package Outline Drawing
For the most recent package outline drawing, see L10.3x3.
L10.3x3
10 LEAD DUAL FLAT PACKAGE (DFN) 
Rev 11, 3/15
3.00
5
PIN #1 INDEX AREA
A
B
1
5
PIN 1
INDEX AREA
(4X)
3.00
2.00
8x 0.50
2
10 x 0.23
0.10
1.60
TOP VIEW
10x 0.35
BOTTOM VIEW
(4X)
0.10 M C A B
0.415
0.200
0.23
0.35
(10 x 0.55)
SEE DETAIL "X"
(10x 0.23)
1.00
MAX
0.10 C
0.20
2.00
(8x 0.50)
BASE PLANE
C
SEATING PLANE
0.08 C
SIDE VIEW
0.415
C
1.60
0.20 REF
4
0.05
2.85 TYP
DETAIL "X"
TYPICAL RECOMMENDED LAND PATTERN
NOTES:
FN9252 Rev 3.00
September 30, 2016
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.
Tiebar shown (if present) is a non-functional feature and may be
located on any of the 4 sides (or ends).
5.
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.
Page 17 of 17