DATASHEET

ISL9219R5360
¬
Data Sheet
December 4, 2009
FN6823.1
USB Compliant Li-ion Battery Charger
Features
The ISL9219R5360 is a fully integrated high input voltage
single-cell Li-ion battery charger. These chargers are fully in
compliance with the USB electrical specification. The
chargers perform the CC/CV charge function required by
Li-ion batteries. The chargers accept an input voltage up to
28V but are disabled when the input voltage exceeds the
OVP threshold, to prevent excessive power dissipation. The
28V rating eliminates the overvoltage protection circuit
required in a low input voltage charger.
• Complete Charger for Single-Cell Li-ion/Polymer Batteries
The fast charge current is programmable with an external
resistor, and the end-of-charge (EOC) current is fixed at
50mA for any input source type. When the input power
source is identified as a USB port, the host controller will
further identify the power type of the port and drive the USBI
pin accordingly.
• USB 100mA/500mA Charge Current Setting
When the battery voltage is lower than the trickle charge
threshold, which is also programmable with an external
resistor, the charger preconditions the battery with an 85mA
constant current. Charge is complete when the charge current
reduces to the EOC current level during the CV charge phase.
The STAT1 and STAT2 provide unique indication for each
charging condition. An internal thermal foldback function
protects the charger from any thermal failure.
• Less than 1µA Leakage Current Off the Battery when No
Input Power Attached or Charger Disabled
• Low Component Count and Cost
• 0.7% Voltage Accuracy
• Programmable Charge Currents
• 250µA (Typ) Suspend Quiescent Current
• Charge Current Thermal Foldback for Thermal Protection
• Trickle Charge for Fully Discharged Batteries
• 28V Maximum Voltage for the Power Input
• Charge Status Indication
• Ambient Temperature Range: -40°C to +85°C
• Pb-free (RoHS Compliant)
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB379 “Thermal Characterization of
Packaged Semiconductor Devices”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
Pinout
PART
NUMBER
ISL9219IRZR5360
PART
MARKING
TEMP.
RANGE
(°C)
VIN
Ordering Information
PACKAGE
(Pb-Free)
PKG.
DWG. #
219
-40 to +85 20 Ld 3x4 QFN L20.3x4
ISL9219IRZ-TR5360* 219
VOUT
ISL9219R5360
(20 LD 3X4 QFN)
TOP VIEW
NC
Additional features include an OVP protected power-good
source, preconditioning of an over-discharged battery, an
NTC thermistor interface for charging the battery in a safe
temperature range, automatic recharge, and thermally
enhanced QFN package.
• No External Blocking Diode Required
NC
The STAT1 and STAT2 pins are of open drain type, allowing
a simple interface to a microprocessor or an LED. When no
adapter is attached or when disabled, the charger draws less
than 1µA leakage current from the battery.
• Integrated Pass Element and Current Sensor
20 19 18 17
16 VOUT
VIN 1
USBI
15 TS
2
AC_IN 3
14 PG
-40 to +85 20 Ld 3x4 QFN L20.3x4
TRKL 4
13 NC
*Please refer to TB347 for details on reel specifications.
NOTE: 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.
STAT1 5
STAT2 6
1
12 TIMER
7
8
9
10
PRECH
ISET
ACFLT
EN
11 GND
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.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL9219R5360
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 30V
Output Pin Voltage (STAT1, STAT2, PG) . . . . . . . . . . . . . -0.3V to 7V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 5.5V
Maximum Output Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A
Thermal Resistance (Junction to Ambient) θJA (°C/W) θJC (°C/W)
3x4 QFN Package (Notes 1, 2) . . . .
41
2.5
Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Maximum Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . .28V
Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 6V
Programmable Charge Current . . . . . . . . . . . . . . . . . . . 50mA to 1A
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:
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.
3. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
Electrical Specifications
Typical values are tested at VIN = 5V and TA at +25°C, maximum and minimum values are established over the
Recommended Operating Conditions, unless otherwise noted.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
(Note 3)
TYP
MAX
(Note 3)
UNITS
POWER-ON RESET
Rising VIN Threshold
VPOR
3.4
3.6
3.8
V
Falling VIN Threshold
VPOR
2.2
2.4
2.6
V
VIN-BAT OFFSET VOLTAGE
Rising Edge
VOS
-
90
150
mV
Falling Edge
VOS
10
50
-
mV
VACFLT
4.3
4.4
4.5
V
AC FAULT DETECTION THRESHOLD
AC Fault Threshold
STANDBY CURRENT
VOUT Pin Sink Current
ILEAK
VIN < V POR or EN = HI
-
1
5.0
µA
VIN Pin Supply Current
ISTANDBY
VOUT floating and EN = HI
-
250
300
µA
VIN Pin Supply Current
IRUN
VOUT floating and EN = LO
-
1
2
mA
Output Voltage
VCH
TA = +25°C, IOUT = 100mA
4.185
4.20
4.215
V
Output Voltage
VCH
IOUT = 100mA
4.169
4.20
4.231
V
-
300
430
mV
VOLTAGE REGULATION
Dropout Voltage
VOUT = 4.2V, IOUT = 1A
OVERVOLTAGE PROTECTION
Overvoltage Protection Rising Threshold
VOVPR
5.64
6.0
6.36
V
Overvoltage Protection Falling Threshold
VOVPF
5.54
5.6
-
V
OUTPUT CURRENT
Constant Charge Current
ICHARGE
AC input, VIN = 5V, VOUT = 3.8V
RISET = 24k
0.9
1.0
1.1
A
VISET
AC input, VIN = 5V, VOUT = 3.8V,
IOUT = 1A
2.364
2.4
2.436
V
Constant Charge Current
ICHARGE
USBI = HI, VIN = 5V, VOUT = 3.8V
380
430
490
mA
Constant Charge Current
ICHARGE
USBI = LO, VIN = 5V, VOUT = 3.8V
65
85
95
mA
Trickle Charge Current
ITRICKLE
For any input type, VIN = 5V, VOUT = 2V
65
85
95
mA
Output Current Set Voltage
2
FN6823.1
December 4, 2009
ISL9219R5360
Electrical Specifications
Typical values are tested at VIN = 5V and TA at +25°C, maximum and minimum values are established over the
Recommended Operating Conditions, unless otherwise noted. (Continued)
PARAMETER
SYMBOL
End-of-Charge Threshold
IMIN
TEST CONDITIONS
For any input type, VIN = 5V
MIN
(Note 3)
TYP
MAX
(Note 3)
UNITS
30
50
70
mA
4.05
4.1
4.15
V
RECHARGE THRESHOLD
Recharge Voltage Threshold
VRECH
TRICKLE CHARGE THRESHOLD
Trickle Charge Threshold Voltage
VMIN
PRECH is floating
2.9
3.0
3.1
V
Trickle Charge Threshold Voltage
VMIN
RPRECH = 82.5k
2.375
2.475
2.575
V
VMIN_HYS
35
60
150
mV
ITS
4.8
5.0
5.3
µA
Low Battery Temperature Threshold
VTMIN
1.86
1.88
1.91
V
High Battery Temperature Threshold
VTMAX
0.145
0.16
0.175
V
Battery Removal Threshold
VRMV
-
2.25
-
V
Charge Current Foldback Threshold
TFOLD
-
125
-
°C
Current Foldback Gain
GFOLD
-
100
-
mA/°C
2.5
3.0
3.3
ms
40
100
170
ms
Input High (USBI, EN, AC_IN)
1.4
-
-
V
Input Low (USBI, EN, AC_IN)
-
-
0.4
V
-
-
1
µA
20
-
-
mA
Trickle Charge Threshold Hysteresis
TEMPERATURE MONITORING
Constant Current Source For TS
OSCILLATOR
Oscillation Period
tOSC
CTIME = 15nF
DE-GLITCH TIME
De-Glitch Time For EOC, Recharge
tDEG
LOGIC INPUT AND OUTPUT
Open Drain Leakage Current When HI
(STAT1, STAT2, ACFLT, TRKL)
Pin Voltage = 6V
Open Drain Sink Current When LOW
(STAT1, STAT2, ACFLT, TRKL)
Pin Voltage = 0.3V
VIN to PG Switch
PMOSFET ON-Resistance
Maximum Output Current
rDS(ON)
-
3
5
Ω
IPG
-
60
-
mA
Pin Descriptions
AC_IN (Pin 3)
VIN (Pin 1, 20)
Input supply voltage, Connect a 1µF ceramic capacitor to
power ground.
USBI (Pin 2)
USB power type selection logic input. When this pin is left
floating or driven to logic LOW, the USB port is regarded as
a low-power port with 100mA maximum output current. In
such cases, the charge current is internally set to 85mA.
When this pin is driven to logic HIGH, the USB port is
considered a high-power port with a 500mA maximum
current available. In such cases, the charge current is set at
430mA regardless of the ISET resistor. There is a 600k
pull-down resistor between the USBI pin to GND.
3
Input source type configuration pin. Pull this pin to logic HI to
configure the charger for an AC adapter. If this pin is left
floating or driven to logic LO, the charger is configured for
USB source type, where the charge current is set at 430mA
or 85mA, depending on the USBI status. There is a 600k
pull-down resistor between the AC_IN pin to GND.
TRKL (Pin 4)
Open-drain indication pin which turns on when charger is in
trickle mode, otherwise turns off. This pin is capable to sink
20mA minimum current to drive an LED.
STAT1 (Pin 5)
Open-drain indication pin. In conjunction with STAT2 this pin
provides a unique indication for each charging state of the
FN6823.1
December 4, 2009
ISL9219R5360
cycle. This pin is capable to sink 20mA minimum current to
drive an LED.
LED. The open drain indication also turns off when an input
OVP condition (VIN > 6V) is encountered.
STAT2 (Pin 6)
EN (Pin 10)
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 20mA minimum current to
drive an LED.
IC enable input. Drive this pin to logic LO or leave it floating
to enable the charger. Drive this pin to logic HI to disable the
charger. There is a 600k pull-down resistor between the EN
pin to GND.
PRECHG (Pin 7)
PG (Pin 14)
Trickle charge threshold voltage programming input pin.
Connect a resistor between this pin and GND to set the
threshold voltage by Equation 1:
The PG pin is a bypass switch that connects to VIN through
an internal P-Channel MOSFET when VIN is within the
power-good window. Otherwise the PG pin is in a high
impedance (floating) state. When VIN is within the
power-good window, the PG pin can source up to 60mA
output current for the down stream circuit. It is
recommended that a 2.2µF ceramic capacitor be connected
at the PG pin to absorb any transient voltage due to the
delay turning off the PMOS under a fast OVP condition.
3 × R TRKLV
V TRKLV = -------------------------------100
(V)
(EQ. 1)
Where RTRKLV is in kΩ, valid for RTRKLV ≤ 100kΩ.
ISET (Pin 8)
Charge-current programing and monitoring pin. Connect a
resistor between this pin and the GND pin to set the charge
current limit by Equation 2:
24000
I OUT = ----------------R ISET
(EQ. 2)
( mA )
Where RISET is in kΩ.
The ISET pin voltage also monitors the actual charge current
during the entire charge cycle, including the trickle,
constant-current, and constant-voltage phases. However,
when the dropout voltage is reached, the ISET pin voltage
will no longer follow the output current due to fact that the
output current is no longer controlled by the IC. When
disabled, VISET = 0V.
When monitoring the charging current at USB input, to
achieve the best accuracy of current monitoring, a one-point
calibration is recommended determine a calibration factor K.
The procedure is described in Equation 3:
I OUTM × V ISET
I OUT – calibrated = ----------------------------------------V ISETM
TS (Pin 15)
Input for an external NTC thermistor for temperature
monitoring. A 5µA internal current source is provided at this
pin and the pin voltage is monitored and compared with the
set thresholds to provide over temperature protection.
TIMER (Pin 12)
The TIMER 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 TIMER 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.
VOUT (Pin 16, 17)
Charger output pin. Connect this pin to the battery. A 1µF or
larger X5R ceramic capacitor is recommended for
decoupling and stability purposes.
(EQ. 3)
Where IOUTM is the applied known current for the calibration
and VISETM is the resulting voltage measured at the VISET
pin with a given RISET. Applying this procedure at each
system during the manufacturing process can result in the
best accuracy. However if it is too difficult to implement the
procedure during the manufacturing process, using an
average value for IOUTM/VISETM through characterizing
some parts at a reasonably large sample size can also
achieve good accuracy.
GND (Pins 11)
System ground connection
NC (Pins 13, 18, 19)
No connect pins.
EPAD
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.
ACFLT (pin 9)
Open-drain indication pin which turns off when the adapter
plugged in does not have sufficient current rating and
the resulting input voltage is dropped to below 4.4V.
This pin is capable to sink 20mA minimum current to drive an
4
FN6823.1
December 4, 2009
ISL9219R5360
Typical Application
TO INPUT SO URCE
C1
R7
R3
R4
D1
D2
D3
R5
C2
D4
ACFLT
STAT1
STAT2
TRKL
AC_IN
R6
R2
CT
PG
G ND
TO DO W N STREAM
CIRCUIT
TS
USBI
ISET
AC
AC/USB
EN
TIMER
DIS
EN
500MA
100MA
ISL9219R5360
*
PRECG
R1
TO BATT
VO UT
VIN
RT
* SEE INPUT AND O UTPUT CAPACITO R SELECTIO N
5
FN6823.1
December 4, 2009
ISL9219R5360
Block Diagram
QMAIN
VIN
VOUT
VOUT
C1
VMIN
ISEN
Input_OK
RISET
+
+
CA
-
IR
CURRENT
REFERENCES
VIN
-
VPOR
+
+
-
ISET
VRECHRG
IT
100000:1
Current
Mirror
VPOR
QSEN
VCH
REFERENCES
TEMPERATURE
MONITORING
80mV
CHRG
+
VA
-
IMIN = 20mA
VCH
+
Trickle/Fast
Minbat
VMIN
ISEN
+
R1
VRECHRG
-
MIN_I
+
PRECH
R2
RPRECH
Recharge
STAT1
VIN
USBI
EN
5uA
TS
STAT2
LOGIC
VIN
TIMER
OSC
COUNTER
GND
PG
AC_IN
ACFLT
TRKL
6
FN6823.1
December 4, 2009
ISL9219R5360
Theory of Operation
The ISL9219R5360 is an integrated charger for single-cell
Li-ion or Li-polymer batteries. The ISL9219R5360 functions
as traditional linear chargers when powered with a voltagesource adapter. When powered with a current-limited
adapter, the chargers minimizes the thermal dissipation
commonly seen in traditional linear chargers.
As linear chargers, the ISL9219R5360 charges a battery in
the popular constant current (CC) and constant voltage (CV)
profile. The constant charge current ISET is programmable
up to 1A with an external resistor. The charge voltage VCH
has 0.7% accuracy over the entire recommended operating
condition range. The charger always preconditions the
battery with a 85mA constant current at the beginning of a
charge cycle, until the battery voltage is verified to be above
the minimum fast charge voltage, VMIN. This low-current
preconditioning charge mode is named trickle mode. A
thermal-foldback feature removes the thermal concern
typically seen in linear chargers. The charger reduces the
charge current automatically as the IC internal temperature
rises above +125°C to prevent further temperature rise. The
thermal foldback feature guarantees safe operation when
the printed circuit board (PCB) is space limited for adequate
thermal dissipation.
USB Compliant Current Setting
The ISL9219R5360 is fully in compliance with the USB
electrical specification when a USB port is used as the input
source. The input source type can be identified by the host
controller. When the USB connector is plugged in, the host
controller will identify the device during the enumeration
process. The host controller will further identify whether the
USB port is a high power port (500mA max current) or low
power port (100mA max current). The host controller will
then drive the AC_IN and USBI pins thru its GPIO pins,
according to the identification results.
If USB compliance is not required, the AC_IN pin can be
hard wired to VOUT so that the fast charge current is always
set by ISET pin.
Depending on the input source type, the charge current
during the constant current phase is:
ISET: determined by RISET if input is an AC adapter
where the VOS is the offset voltage for the input and output
voltage comparator and the VOVP is the overvoltage
protection threshold given in the “Electrical Specification”
table on page 2. All VPOR, VOS, and VOVP have hysteresis,
as given in the Electrical Specification table. If the input
voltage is not in the power-good range, the charger will not
charge the battery. If the input voltage is within the power
good range, the PG pin will be connected to VIN through an
internal P-Channel MOSFET with up to 60mA current
capability. If the input voltage is not within the power-good
range, the PG will be switched off from VIN and turned into a
high impedance (floating) state. When an overvoltage
condition occurs, the ISL9219R5360 enters the suspend
state.
Timeout Function
The charger offers a safety timer for setting the maximum
charge time (TIMEOUT) limit to prevent charging a dead
battery for an extensively long time. The trickle mode is
limited to 1/8 of TIMEOUT limit. The charger automatically
re-charges the battery when the battery voltage drops below
a recharge threshold.
State Indication
Five indication pins, STAT1, STAT2 and PG are available
from the charger to indicate the charge status and fault
conditions. The STAT1 and STAT2 are configured to indicate
various charging condition as given by the true table in
Table 1:
TABLE 1. STAT1 AND STAT2 TRUE TABLE
STAT1
STAT2
CHARGING CONDITION
L
L
Charging
L
H
Charge Complete and during Re-Charge
H
L
Fault
H
H
Suspend
A fault status is triggered under one of these conditions:
1. The TS pin voltage is outside the preset temperature
window
2. Timeout occurs before the EOC current has been
reached
The PG pin indicates that VIN is within the power-good
range.
ISET = 430mA if input is a high power USB port
ISET = 85mA if input is a low power port
Applications Information
Power on Reset (POR)
Power-Good Range
The power-good range is defined by the following three
conditions:
1. VIN > VPOR
2. VIN - VBAT > VOS
3. VIN < VOVP
The ISL9219R5360 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.
The ISL9219R5360 has a typical rising POR threshold of
3.6V and a falling POR threshold of 2.4V.
7
FN6823.1
December 4, 2009
ISL9219R5360
Trickle Charge
Total Charge Time
If the battery voltage is below the trickle charge threshold,
the ISL9219R5360 charger delivers a small current to trickle
charge the battery until the voltage reaches the fast charge
threshold value. The trickle charge threshold is programmed
by the resistor connected between the PRECH pin and
GND. If the PRECH pin is left floating, a default value of 3.0V
is used as the trickle charge voltage.
The total charge time for the CC mode and CV mode is
limited to a length of TIMEOUT. A 22-stage binary counter
increments each oscillation period of the internal oscillator to
set the TIMEOUT. The TIMEOUT can be calculated as
Equation 5:
Charge Cycle
A 1nF capacitor leads to 14 minutes of TIMEOUT. For
example, a 15nF capacitor sets the TIMEOUT to be 3.5 hours.
The charger has to reach the end-of-charge condition before
the TIMEOUT, otherwise, a TIMEOUT fault is issued. The
TIMEOUT fault latches up the charger. There are two ways to
release such a latch-up: either to recycle the input power, or
toggle the EN pin to disable the charger and then re-enable it.
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 voltage stays above VMIN (3.0V typical). If
the battery voltage stays below VMIN, the charger stays in
the trickle mode. The charger moves to the CC mode after
the battery voltage is above VMIN. As the battery-pack
terminal voltage rises to the final charge voltage (VCH), the
CV mode begins. Since the battery terminal voltage is
regulated at the constant VCH in the CV mode, the charge
current is expected to decline as the cell voltage rises. After
the charge current drops below IMIN, which is fixed at 50mA
for any input type, the ISL9219R5360 indicates the
end-of-charge (EOC) with STAT1 and STAT2. The charging
actually does not terminate until the internal timer completes
its length of TIMEOUT in order to bring the battery to its full
capacity.
The following events initiate a new charge cycle:
• POR
• A new battery being inserted (detected by TS pin)
• Recovery from an battery over-temperature fault
• The EN pin is toggled from HI to LO or from HI to floating
TIMEOUT = 2
22
C TIME
⋅ t OSC = 14 ⋅ -----------------1nF
( minutes )
(EQ. 5)
The trickle mode charge has a time limit of 1/8 TIMEOUT. If
the battery voltage does not reach VMIN within this limit, a
TIMEOUT fault is issued and the charger latches up. Thus,
the charger can stay in trickle mode for no more than 1/8 of
TIMEOUT interval.
Monitoring Output Current thru ISET Pin
In addition to programming the fast charge current, the ISET
can be used to monitor the actual output current for the AC
adapter input current setting. During the constant current
phase, the ISET pin voltage is fixed at 2.4V. In this case, the
output current can be calculated by using 2.4V divided by
RISET. During the constant voltage phase, the output current
can be calculated by using the pin voltage, divided by RISET.
For USB input current setting, VISET can still be used to
monitor the charge current but since VISET is not used for
the close loop current regulation, to achieve a good
accuracy, an one-point calibration is required.
End-of-Charge (EOC) Current
Recharge
After a charge cycle completes at a timeout event, charging
is prohibited until the recharge condition (VOUT < VRECH)
is met. Then the charging restarts with the timer reset to
zero. The STAT1 and STAT2 indication however, is
unchanged.
Internal Oscillator
The internal oscillator establishes a timing reference. The
oscillation period is programmable with an external timing
capacitor, CTIME, as shown in “Typical Application” on
page 5. The oscillator charges the timing capacitor to 1.5V
and then discharges it to 0.5V in one period, both with 10µA
current. The period tOSC is shown in Equation 4:
6
t OSC = 0.2 ⋅ 10 ⋅ C TIME
( sec onds )
(EQ. 4)
A 1nF capacitor results in a 0.2ms oscillation period. The
accuracy of the period is mainly dependent on the accuracy
of the capacitance and the internal current source.
8
The end-of-charge current IMIN sets the level at which the
charger starts to indicate the charge complete condition with
the indication pins. The charger actually does not terminate
charging until the end of the TIMEOUT interval, as described
in the “Total Charge Time” on page 8. The IMIN is fixed at
50mA for all input types, i.e. for AC adapter, USB high power
and USB low power.
Charge Current Thermal Foldback
Overheating is always a major concern in a linear charger.
The maximum power dissipation usually occurs at the
beginning of a charge cycle when the battery voltage is at its
minimum but the charge current is at its maximum. The
charge current thermal foldback function in the
ISL9219R5360 eliminates the overheating problem.
The thermal foldback function has no impact on the charge
current until the internal temperature reaches approximately
+125°C; then charge current is reduced at a rate of 100mA/°C.
For a charger with the constant charge current set at 1A, the
charge current is reduced to zero when the internal
temperature rises to +135°C.
FN6823.1
December 4, 2009
ISL9219R5360
OVP Protection
2.8V
The ISL9219R5360 is capable for up to 28V at the input pin.
However, reliability reason, the charger will stop charging
should the input voltage exceed 6V. This feature prevents
excessive heating generated by the high input voltages. If an
OVP condition is encountered, the PG pin will turn to high
impedance to indicate the OVP condition, the changer
enters the suspend state. If VIN is within the power good
range, the PG pin is connected to VIN pin internally to
provide up to 60mA supply current to the down stream
circuit.
NTC FUNCTION
R1
BATTERY CP1
REMOVAL
CP2 -
R3
TO NTC PIN
Q1
RT
OVER
TEMP
R4
CP3 VTMAX
Q2
The ISL9219R5360 provides a TS pin to monitor the battery
temperature to ensure a safe charging temperature range.
The temperature range is programmable with an external
negative temperature coefficient (NTC) thermistor. The
TEMP pin is also used to detect the removal of the battery.
The ISL9219R5360 uses two comparators (CP2 and CP3) to
form a window comparator, as shown in Figure 2. When the
TS pin voltage is “out of the window,” determined by the
VTMIN and VTMAX, the ISL9219R5360 stops charging and
indicate a fault condition. When the temperature returns to the
set range, the charger restarts a charge cycle. The two
MOSFETs, Q1 and Q2, produce hysteresis for both upper and
lower thresholds. The temperature window is shown in
Figure 1 for a 0°C to +50°C typical application using a
Mitsubishi type TH11-4H104F thermistor.
VTMIN (1.88V)
TS
VTMIN
+
+
NTC Thermistor
R2
+
UNDER
TEMP
5µA
VRMV
R5
GND
FIGURE 2. INTERNAL CIRCUIT FOR NTC INTERFACE
Battery Removal Detection
The ISL9219R5360 assumes that the thermistor is
co-packed with the battery and is removed together with the
battery. When the charger senses a TS pin voltage that is
2.25V or higher, it assumes that the battery is removed. The
battery removal detection circuit is also shown in Figure 2.
When a battery is removed, the ISL9219R5360 will enter the
suspend state and the charging is halted. When a battery is
inserted again, a new charge cycle starts.
Shutdown and Suspend State
The ISL9219R5360 can be orderly shutdown by one of these
conditions:
1. EN pin is pulled to logic HI
VTMIN- (1.68V)
NTC PIN
VOLTAGE
VTMAX+ (0.18V)
VTMAX (0.16V)
2. The battery has been removed from the charger. The
battery removal condition can be detected by the TS pin
(see “Battery Removal Detection” on page 9)
When shut down, the charger stays in the suspend state and
draws typically less than 300µA current from the input
power.
0V
Under an OVP condition, the charger also enters the
suspended state.
UNDER
TEMP
OVER
TEMP
Input and Output Capacitor Selection
FIGURE 1. THRESHOLD VOLTAGES FOR 0°C to +50°C
WINDOW
A 0.47µF or higher value ceramic capacitor for the input is
recommended. 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 capacitors, a
1Ω series resistor is recommended, as shown in the “Typical
Application” schematic on page 5, to provide adequate
damping.
When the battery is attached to the charger, the output
capacitor can be any ceramic type with the value higher than
9
FN6823.1
December 4, 2009
ISL9219R5360
0.1µF. However, if there is a chance the charger will be used
as an LDO linear regulator, a 10µF tantalum capacitor is
recommended.
Board Layout Recommendations
The ISL9219R5360 internal thermal foldback function limits
the charge current when the internal temperature reaches
approximately +125°C. 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 copper attached to the exposed pad usually result in
better thermal performance. On the other hand, the number
of vias is limited by the size of the pad. The exposed pad is
big enough for 5 vias.
State Diagram
The state diagram is shown in Figure 3. There area total of 5
states during a complete charging cycle: trickle charge, CC
charge, CV charge, charge complete/recharge, fault and
suspend. In the trickle mode, the ISL9219R5360 charges the
battery in a trickle current. If VOUT reaches VMIN before the
trickle charge timeout interval, the operation will move to the
CC mode. Before entering the CC mode, the input source is
identified. The CC mode output current is set according to
the input type as described in “USB Compliant Current
Setting” on page 7. When the output voltage reaches the
4.2V final voltage, the operation will move 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 moves to charge complete state.
The charger continues to charge the battery until a timeout
condition is reached, then the charging will be terminated.
After the termination, if the output voltage drops below the
recharge threshold, a recharge starts and the timer is rest to
zero. The STAT1 and STAT2 indications, remains the same
as the charge complete state.
In the event that the timeout condition is reached before
EOC, the fault mode is entered. The fault mode can also be
triggered by an OTP event. To exit the fault mode, the input
power has to be removed and re-applied, or the EN pin is
toggled to HI and back to LO, then a new cycle begins.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
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.
For information regarding Intersil Corporation and its products, see www.intersil.com
10
FN6823.1
December 4, 2009
ISL9219R5360
Power
Up
VIN>VPOR?
N
Y
N
VIN<VOVP?
ACFLT=H
Y
Y
POR
AC_IN = HI?
N
N
VIN>VOUT +VOS?
Y
Suspend
STAT1 = H
STAT2 = H
N
EN = LO ?
N
USBI = HI?
EN=H
Y
Anytime
when
Batt is
removed
Y
Initialization
Reset
counter
IOUT = ISET
IOUT = 500mA
TRICKLE CHARGE
STAT1 = L
STAT2 = L
PG = VIN
ACFLT = L
IOUT < IMIN ?
CV CHARGE
STAT1= L
STAT2 = L
PG = VIN
ACFLT = L
Anytime when
VIN < 4.4V
ACFLT = H
Y
N
IOUT = 100mA
VOUT>VMIN
CV CHARGE
STAT1= L
STAT2 = L
PG = VIN
ACFLT = L
N
CHARGE
COMPLETE
STAT1 = L
STAT2 = H
PG=VIN
ACFLT=L
Timeout?
N
Y
VOUT =
4.2V?
N
Trickle
Timeout ?
Y
N
Y
Y
N
Timeout ?
Y
OTP
FAULT
STAT1 = H
STAT2 = L
POR or
EN toggled
POR
Timeout ?
N
Y
CHARGE COMPLETE
STAT1 = L
STAT2 = H
Charger OFF
VOUT <
VRECH?
Y
RE-CHARGE
STAT1 = L
STAT2 = H
Charger ON
Timer Reset
N
Timeout ?
Y
N
FIGURE 3. STATE DIAGRAM
11
FN6823.1
December 4, 2009
ISL9219R5360
Package Outline Drawing
L20.3x4
20 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE
Rev 0, 6/07
3.00
0.10 M C A B
0.05 M C
A
B
4
20X 0.25
16X 0.50
+0.05
-0.07
17
A
PIN 1 INDEX AREA
(C 0.40)
20
16
1
PIN 1
INDEX AREA
4.00
2.65
11
+0.10
-0.15
6
0.15 (4X)
A
10
7
VIEW "A-A"
1.65
TOP VIEW
+0.10
-0.15
20x 0.40±0.1
BOTTOM VIEW
SEE DETAIL "X"
0.10 C
C
0.9± 0.1
SEATING PLANE
0.08 C
SIDE VIEW
(16 x 0.50)
(2.65)
(3.80)
(20 x 0.25)
C
0.2 REF
(20 x 0.60)
5
0.00 MIN.
0.05 MAX.
(1.65)
(2.80)
DETAIL "X"
TYPICAL RECOMMENDED LAND PATTERN
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 ± 0.0
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.
12
FN6823.1
December 4, 2009
Similar pages