Intersil ISL9205DIRZ Li-ion battery charger Datasheet

ISL9205
®
Data Sheet
July 28, 2010
FN9252.2
Li-ion Battery Charger
Features
The ISL9205 is an integrated single-cell Li-ion or Li-polymer
charger 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.
• Complete Charger for Single-Cell Li-ion/Polymer Batteries
The ISL9205 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 be 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 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, 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.
1
• 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
• NTC Interface (not available in some package options)
• 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
• Blue-Tooth Devices
• PDAs
• MP3 Players
• Stand-Alone Cradle or Travel Chargers
• Other Handheld Devices
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Thermaguard is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2007, 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL9205
Ordering Information
PART
NUMBER*
(Note)
PART
MARKING
TEMP.
RANGE (°C)
VBAT (V)
VSEN
TEMP
TIMEOUT
PACKAGE
(Pb-free)
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
*Add “-T” suffix for tape and reel.
NOTE: 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.
Pinouts
ISL9205A, ISL9205B, ISL9205C
(10 LD DFN)
TOP VIEW
13 VBAT
14 VBAT
VSEN
3
8
IREF
3
4
9
TIME
4
7
V2P8
GND
5
6
EN
8
9
STATUS
V2P8
2
11 TEMP
10 IMIN
7
FAULT
2
EN
1
6
TIME
10 VBAT
5
STATUS
1
GND
FAULT
VIN
12 VSEN
TOEN
VIN
15 VIN
16 VIN
ISL9205
(16 LD QFN)
TOP VIEW
IREF
ISL9205D
(10 LD DFN
TOP VIEW
2
VIN
1
10 VBAT
FAULT
2
9
TEMP
STATUS
3
8
IREF
TIME
4
7
V2P8
GND
5
6
EN
FN9252.2
July 28, 2010
ISL9205
Typical Applications
For 3x3 QFN Package Option
5V WALL
ADAPTER
1kΩ
R1
1µF
C1
1kΩ
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
100kΩ
100kΩ
CTIME
15nF
For 3x3 DFN Package Option
5V WALL
ADAPTER
VIN
1µF
C1
VBAT
1µF
1kΩ
R1
1kΩ
R2
D1
D2
ISL9205AIRZ
C2
BATTERY
PACK
VSEN
FAULT
STATUS
IREF
EN
V2P8
1µF
C3
3
TIME
GND
RIREF
100kΩ
CTIME
15nF
FN9252.2
July 28, 2010
ISL9205
Pin Description
VIN (Pin 1, 15, 16 for ISL9205; Pin 1 for ISL9205A,
ISL9205B, ISL9205C and ISL9205D)
VIN is the input power source. Connect to a wall adapter.
FAULT (Pin 2)
FAULT is 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.
STATUS (Pin 3)
STATUS is an open-drain output indicating charging and
inhibit states. The STATUS 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.
TIME (Pin 4)
The TIME pin determines the oscillation period by
connecting a timing capacitor between this pin and GND.
The oscillator also provides a time reference for the charger.
GND (Pin 5)
GND is the connection to system ground.
TOEN (Pin 6 for ISL9205; N/A for ISL9205A,
ISL9205B, ISL9205C and ISL9205D)
TOEN is the 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.
EN (Pin 7 for ISL9205; Pin 6 for ISL9205A,
ISL9205B, ISL9205C and ISL9205D)
EN is the 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.
V2P8 (Pin 8 for ISL9205; Pin 7 for ISL9205A,
ISL9205B, ISL9205C and ISL9205D)
This is 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.
IREF (Pin 9 for ISL9205; Pin 8 for ISL9205A,
ISL9205B, ISL9205C and ISL9205D)
This is 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 1:
80
I REF = ----------------R IREF
(EQ. 1)
(A)
Where RIREF is in kΩ.
IMIN (Pin 10 for ISL9205; N/A for ISL9205A,
ISL9205B, ISL9205C and ISL9205D)
IMIN is the 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.
TEMP (Pin 11 for ISL9205; Pin 9 for ISL9205D; N/A
for ISL9205A, ISL9205B and ISL9205C)
TEMP is the input for an external NTC thermistor. The TEMP
pin is also used for battery removal detection.
VSEN (Pin 12 ISL9205; Pin 9 for ISL9205A,
ISL9205B and ISL9205; N/A for ISL9205D)
VSEN is 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.
VBAT (Pin 13, 14 for ISL9205; Pin 10 for ISL9205A,
ISL9205B, ISL9205C and ISL9205D)
VBAT is the connection to the battery. Typically a 10μF
Tantalum capacitor is needed for stability when there is no
battery attached. When a battery is attached, only a 0.1μF
ceramic capacitor is required.
4
FN9252.2
July 28, 2010
ISL9205
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
θJA (°C/W)
θJC (°C/W)
3x3 DFN Package (Note 1) . . . . . . . . .
48
6
3X3 QFN Package (Note 2) . . . . . . . .
54
6
Maximum Junction Temperature (Plastic Package). . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . .-65°C to +150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300°C
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:
1. θJA 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.
2. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Typical Values Are Tested at VIN = 5V and the Ambient Temperature at +25°C. All Maximum and Minimum
Values Are Guaranteed Under the Recommended Operating Supply Voltage Range and Ambient Temperature
Range, Unless Otherwise Noted.
PARAMETER
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
-
-
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 3)
STANDBY CURRENT
BAT Pin Sink Current
ISTANDBY Charger disabled or the input is floating
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)
rDS(ON)
VBAT = 4.0V, charge current = 0.35A
-
500
-
mΩ
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
PMOS ON-Resistance
CHARGE CURRENT (Note 4)
V2P8 PIN OUTPUT
V2P8 Pin Output Voltage
VV2P8
5
FN9252.2
July 28, 2010
ISL9205
Electrical Specifications
Typical Values Are Tested at VIN = 5V and the Ambient Temperature at +25°C. All Maximum and Minimum
Values Are Guaranteed Under the Recommended Operating Supply Voltage Range and Ambient Temperature
Range, Unless Otherwise Noted. (Continued)
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
VRCH
Recharge Threshold Hysteresis
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
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
kΩ
OSCILLATOR
Oscillation Period
tOSC
CTIME = 15nF
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
μA
NOTE:
3. 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.
4. The charge current can be affected by the thermal foldback function if the IC under the test setup cannot dissipate the heat.
6
FN9252.2
July 28, 2010
ISL9205
The test conditions for the Typical Operating Performance are: VIN = 5V, TA = +25°C,
RIREF = RIMIN = 100kΩ, VBAT = 3.7V, Unless Otherwise Noted
4.210
4.210
4.206
4.204
4.202
4.198
VBAT (V)
VBAT (V)
Typical Operating Performance
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 2. CHARGER OUTPUT VOLTAGE vs TEMPERATURE
FIGURE 1. CHARGER OUTPUT VOLTAGE vs CHARGE
CURRENT
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 3. CHARGER OUTPUT VOLTAGE vs INPUT
VOLTAGE CHARGE CURRENT IS 50mA
FIGURE 4. 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 5. CHARGE CURRENT vs AMBIENT TEMPERATURE
7
0.60
4.2
4.6
5.0
5.4
5.8
6.2
VIN (V)
FIGURE 6. CHARGE CURRENT vs INPUT VOLTAGE
FN9252.2
July 28, 2010
ISL9205
The test conditions for the Typical Operating Performance are: VIN = 5V, TA = +25°C,
RIREF = RIMIN = 100kΩ, VBAT = 3.7V, Unless Otherwise Noted (Continued)
2.90
2.90
2.88
2.88
2.86
2.86
VIN (V)
V2P8 (V)
Typical Operating Performance
2.84
2.84
2.82
2.80
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 8. V2P8 OUTPUT vs ITS LOAD CURRENT
1.0
1.20
0.9
1.08
0.8
0.96
rDS(ON) (Ω)
rDS(ON ) (Ω)
FIGURE 7. 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)
FIGURE 9. rDS(ON) vs TEMPERATURE AT 3.7V OUTPUT
3.7
3.5
VBAT (V)
3.9
4.1
FIGURE 10. rDS(ON) vs OUTPUT VOLTAGE USING CURRENT
LIMITED ADAPTERS
0.50
0.80
0.40
0.70
ENABLED
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
VIN (V)
FIGURE 11. INPUT QUIESCENT CURRENT vs INPUT
VOLTAGE
8
6.0
0
20
40
60
80
100
120
TEMPERATURE (°C)
FIGURE 12. INPUT QUIESCENT CURRENT vs TEMPERATURE
FN9252.2
July 28, 2010
ISL9205
Functional Block Diagram
Q MAIN
VIN
C1
VBAT
ISEN
+
CA
-
IR
CURRENT
REFERENCES
V POR
+
-
IREF
VSEN
VIN
+
INPUT_OK
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
MONITOR
TEMP
OSC
TIME
COUNTER
FAULT
FAULT
GND
Theory of Operation
The ISL9205 is an integrated charger for single-cell Li-ion or
Li-polymer batteries. The ISL9205 is capable of operating in
two operation modes, linear charge mode and pulse charge
mode. The ISL9205 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 and
the power dissipation is hence drastically reduced.
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 (CC)
mode starts. The constant current is programmable between
50mA to 1A.
Constant Voltage Phase
Constant Current Phase
The ISL9205 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
9
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.
FN9252.2
July 28, 2010
ISL9205
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.
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 EOC (end-of-charge)
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 13
show the complete cycle operation.
Trickle
CC
CV
4.2V
IREF
Charge
Voltage
VREC
Charge
Current
2.8V
10%IREF
CHG
IMIN
STATUS
Indication
TIME
FIGURE 13. TYPICAL CHARGE CYCLE WITH TIMEOUT
Temperature Monitoring and Thermal Foldback
In the event where 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 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
10
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.
Oscillator, TIMEOUT, and Charge Cycle
The ISL9205 incorporates with 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, the time-out 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 elapsed, 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, the time-out 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.
FN9252.2
July 28, 2010
ISL9205
Indications
Stability Consideration
The ISL9205 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 as the presence of AC adapter.
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.
Charger Disable
Input Bypass Capacitor
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.
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, as shown in the “Typical Applications” on
page 3, to provide adequate damping.
Remote Battery Voltage Sensing
In the ISL9205 and the 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 PCB traces can be eliminated, resulting 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 uses a thermally-enhanced QFN/DFN
packages that has 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 (4) such thermal vias
are recommended. Each thermal via is recommended to
have 0.3mm diameter and 0.7mm distance from other
thermal vias.
11
State Machine Diagram
The state machine diagram is shown in Figure 14. 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. Anytime 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.
FN9252.2
July 28, 2010
ISL9205
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
ENABLED
TEMP FAULT
REMOVED
TRICKLE
CHARGE
CHARGER: ON
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
CHARGER: OFF
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
TIMEOUT
STATUS: ON
FAULT: OFF
V BAT > VRCH
and I CHG< I MIN
CHARGE
COMPLETE
VBAT < V RCH
CHARGER: ON
STATUS: OFF
FAULT: OFF
FIGURE 14. STATE MACHINE DIAGRAM
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Intersil products are sold by description only. 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 data sheets 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.
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12
FN9252.2
July 28, 2010
ISL9205
Package Outline Drawing
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
4
9
(4X)
+ 0.10
- 0.15
0.15
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 )
(
SIDE VIEW
1. 70 )
( 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.
13
FN9252.2
July 28, 2010
ISL9205
Package Outline Drawing
L10.3x3
10 LEAD DUAL FLAT PACKAGE (DFN)
Rev 6, 09/09
3.00
6
PIN #1 INDEX AREA
A
B
1
6
PIN 1
INDEX AREA
(4X)
3.00
2.00
8x 0.50
2
10 x 0.23
4
0.10
1.60
TOP VIEW
10x 0.35
BOTTOM VIEW
4
(4X)
0.10 M C A B
0.415
PACKAGE
OUTLINE
0.200
0.23
0.35
(10 x 0.55)
SEE DETAIL "X"
(10x 0.23)
1.00
MAX
0.10 C
BASE PLANE
2.00
0.20
C
SEATING PLANE
0.08 C
SIDE VIEW
(8x 0.50)
C
0.20 REF
5
1.60
0.05
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.
Lead width applies to the metallized terminal and is measured
between 0.18mm 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.
14
FN9252.2
July 28, 2010