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®
Data Sheet
November 2003
ISL6291
FN9102.1
Li-ion/Li Polymer Linear Battery Charger
The ISL6291 provides a low-cost integrated charger solution
for single-cell Li-ion and Li Polymer rechargeable batteries.
No external pass element, current sensing resistor, or
reverse blocking diode is required with this solution.
The ISL6291 is a constant-current (CC)/constant-voltage
(CV) charger. The constant charge current is programmable
up to 2.0A with an external signal resistor. An internal
trimmed current-sense circuit guarantees 10% accuracy,
with no bulky external current-sense resistor. The constant
voltage is either 4.1V or 4.2V. The charger always
preconditions the battery with 1/10 of the programmed
charge current at the beginning of a charge cycle, until it
verifies that the battery can be fast-charged. A safety timer
prevents over-charging a dead battery. The charging
terminates as the charge current falls below the
programmed minimum current during the CV mode. The
charger automatically re-charges the battery when the
battery voltage drops below a recharge threshold. A simple
interface with an NTC thermistor avoids charging the battery
outside a programmable temperature window. A thermal-
foldback feature of the ISL6291 guarantees safe operation
when the printed circuit board space is limited for thermal
dissipation. The charger reduces the charge current
automatically, as the internal temperature rises above a
preset level, to prevent further temperature rise.
When the wall adapter is not present, the ISL6291 draws
less than 1µA current from the battery. Two logic outputs
provide the charging status and fault information, and an
easy interface to system logic. A V2P8 pin outputs a 2.8V
reference voltage that can be used to bias other circuits, or
as an indication for the adapter presence.
The ISL6291 is packed in a thermally enhanced 5x5 QFN
package. See the Technical Brief TB389 given in the
Related Literature for more information related to the
package.
Ordering Information
TEMP. RANGE
PART NUMBER (oC) PACKAGE
PKG.
DWG. #
ISL6291-1CR
-20 to 70 16 Ld 5x5 QFN L16.5x5B
ISL6291-1CR-T 16 Ld 5x5 QFN Tape and Reel
ISL6291-2CR
-20 to 70 16 Ld 5x5 QFN L16.5x5B
ISL6291-2CR-T 16 Ld 5x5 QFN Tape and Reel
ISL6291EVAL1 Evaluation Board
Features
• Integrated Linear Pass Element
• Integrated Charge Current Sensor
• No External Reverse Blocking Diode Required
• 1% Voltage Accuracy
• Programmable Current Limit Up to 2.0A
• Programmable End-of-Charge Current
• Trickle Charge an Over Discharged Battery
• Charge Current Thermal Foldback
• Simple Interface for Low-Cost Thermistor
• Accepts USB Bus Power
• Ambient Temperature Range: -20oC to 70oC
• Thermally-Enhanced 5x5 QFN Package (θJA = 33oC/W)
Applications
• Handheld Devices
• Cell Phones
• PDAs
• Stand-Alone Chargers
• USB Bus-Powered Chargers
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
Pinout
ISL6291 (QFN)
TOP VIEW
16 15 14 13
VIN 1
FAULT 2
STATUS 3
12 VBAT
11 TEMP
10 IMIN
TIME 4
9 IREF
5678
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Block Diagrams
ISL6291
VIN x3
x3 VBAT
V2P8
IREF
IMIN
TOEN
TEMP
REF
VPOR
VCH
VMIN
VRECHRG
IR
Current
Source
100000:1
current
mirror
ISEN
Inputok
+
- VPOR
++
- 80mV
+
C- A
CHRG
TEMP
MON
+
VA -
VCH
ISEN2
T rickle/CC
IMIN
+
- MIN_I
V2P8
VTMIN
-
+
VTMAX
-
+
U.T .
O.T .
Minbat
+
-
VMIN
LOGIC
Charge
S QSET
RQ
CLR
Fault
S QSET
RQ
CLR
COUNTER
OSC
VRECHRG
+
Recharge -
CHRG
FAULT
SHDN
Inputok
STATUS
FAULT
EN
TIME
GND
2

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Typical Application
ISL6291
5V W all
Adapter
C1
1µF
5k
5 k
VIN
TOEN
VBAT
ISL6291
0.1µF
FAULT
STATUS
EN
V2P8
TIME
TEMP
IREF
IMIN
GND
15nF CTIME
10µF
C2 V2P8
T
RIMIN
80k
RIREF
80 k
Battery
Pack
3

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ISL6291
Absolute Maximum Ratings
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.5V
Signal Input Voltage (EN, TOEN) . . . . . . . . . . . . . . . . . . . . . . . 3.3V
ESD Rating
Human Body Model (Per MIL-STD-883 Method 3015.7) . . . . .1kV
Machine Model (Per EIAJ ED-4701 Method C-111) . . . . . . .200V
Recommended Operating Conditions
Ambient Temperature Range. . . . . . . . . . . . . . . . . . . -20oC to 70oC
Supply Voltage, VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . 4.35V to 10V
Thermal Information
Thermal Resistance
θJA (oC/W) θJc (oC/W)
QFN Package (Notes 1, 2) . . . . . . . .
36
5.5
Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC
Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300oC
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.
NOTE:
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 25oC and 5V Input, Maximum and Minimum Values Are Guaranteed Over 0oC to
70oC Ambient Temperature with a Supply Voltage in the Range of 4.35V to 10V, Unless Otherwise Noted.
PARAMETER
SYMBOL
TEST CONDITIONS
POWER-ON RESET
Rising VIN Threshold
Hysteresis
STANDBY CURRENT
VBAT Pin Sink Current
VIN Pin Supply Current
VOLTAGE REGULATION
ISTANDBY VIN < VBAT
IVIN VIN > VBAT and EN = floating
Output Voltage
Output Voltage
Dropout Voltage (Note 3)
CHARGE CURRENT
VCH
VCH
VDROP
ISL6291-1
ISL6291-2
VBAT = 4.2V, charge current = 0.5A
Constant Charge Current (Note 4)
Trickle Charge Current
End-of-Charge Threshold
RECHARGE THRESHOLD
ICHARGE
ITRICKLE
IEOC
RIREF = 80k, VBAT = VCH - 100mV
RIMIN pin = 80k
Recharge Voltage Threshold
Recharge Voltage Threshold
TRICKLE CHARGE THRESHOLD
VRECHRG ISL6291-2
VRECHRG ISL6291-1
Trickle Charge Threshold Voltage
TEMPERATURE MONITORING
VMIN
Low Battery Temperature Threshold
High Battery Temperature Threshold
Battery Removal Threshold
Charge Current Foldback Threshold (Note 3)
Current Foldback Gain
OSCILLATOR
VTMIN
VTMAX
VRMV
TFOLD
GFOLD
V2P8 = 2.8V
Oscillation Period
LOGIC INPUT AND OUTPUT
CTIME = 15nF
Logic Input High
Logic Input Low
STATUS/FAULT Sink Current
Pin Voltage = 0.8V
NOTES:
3. Guaranteed by design, not tested.
4. The actual current may be affected by the thermal fold-back or the dropout voltage.
MIN TYP MAX UNITS
- 3.9 4.3 V
- 160 - mV
- - 1 µA
- 1 - mA
4.059
4.158
-
4.10
4.20
-
4.141
4.242
250
V
V
mV
0.9 1.0 1.1
A
- 100 - mA
- 100 - mA
- 4.00 -
- 3.90 -
V
V
- 3.0 -
V
1.33
0.252
-
85
-
1.40
0.280
2.10
100
40
1.47
0.308
-
115
-
V
V
V
oC
mA/oC
2.1 3 3.9 ms
2.0 - - V
- - 0.8 V
5 - - mA
4

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ISL6291
Functional Pin Description
VIN (Pin 1, 15, 16)
VIN is the input power source pin that is connected to a wall
adapter.
FAULT (Pin 2)
FAULT is an open-drain output indicating fault status. When
a fault condition occurs, this pin is pulled to LOW.
STATUS (Pin 3)
STATUS is an open-drain output indicating charging and
inhibit states. During any charge mode, this pin is pulled to
LOW.
TIME (Pin 4)
Connect a timing capacitor CTIME between this pin and
GND. The internal oscillator, as shown in the Block Diagram,
charges and discharges the timing capacitor between 0.5V
and 1.5V with 10µA current. The oscillation period can be
found as:
TOSC = 0.2 106 CTIME
( seconds)
A 22-stage binary counter increments each oscillation period
to set up the TIMEOUT interval. The TIMEOUT interval can
be calculated as:
TIMEOUT
=
222 TOSC=
14
-C----T----I--M----E--
1nF
(minutes)
When the fast charge takes longer than the TIMEOUT
interval, or the Trickle charge time exceeds 1/8 of the
TIMEOUT interval, the charger issues a TIMEOUT fault
status and stops charging.
The oscillator also provides a time reference for the charger.
GND (Pin 5)
GND is the connection to system ground.
TOEN (Pin 6)
TOEN is the TIMEOUT enable input pin. Pulling this pin to
LOW disables the TIMEOUT charge-time limit for the fast
charge modes. Leave this pin floating to enable the
TIMEOUT limit. An internal 10µA pull-up circuit pulls this pin
up to a 2.8V internal reference. The trickle mode always has
the 1/8 TIMEOUT limited charge time regardless of this
input. When a TIMEOUT fault is issued, the charger is
latched. The only way to enable the charger again is to cycle
the input power, or to toggle the EN pin.
EN (Pin 7)
EN is the CMOS logic input. Leave this pin floating to enable
the charger. This pin is pulled up to the internal 2.8V
reference via a 10µA current source.
V2P8 (Pin 8)
V2P8 is a 2.8V reference voltage output. V2P8 pin outputs a
2.8V voltage when the input voltage rises above the POR
threshold and outputs zero voltage otherwise. This pin can
be used as an adapter presence signal. A 0.1µF Ceramic
capacitor is recommended for decoupling purposes. This pin
can be used to bias other circuits with a maximum current of
2mA.
IREF (Pin 9)
IREF is the programming input for the constant charge
current. Connect a resistor RIREF (see the Typical
Application) to this pin. The voltage of this pin is regulated to
a 0.8V reference voltage. The charging current during the
constant current mode charge is 100,000 times of the
current in the RIREF resistor. The charging current in the
constant current mode can be found as:
IREF
=
100000
--V----R----E----F---
RIREF
=
---0---.--8----V-----
RIREF
×105
(
A)
where VREF is the 0.8V reference voltage.
IMIN (Pin 10)
IMIN is a programmable input for the end-of-charge current.
The pin voltage is also regulated at 0.8V. The end-of-charge
current can be found as:
IMIN
=
10000
-V----R-----E---F---
RIMIN
=
R---0--I-.-M-8---V-I--N-- ×104(A)
TEMP (Pin 11)
TEMP is an Input for an external NTC thermistor. As shown
in the Block Diagram, two comparators forms a window
comparator with its low and high thresholds set by VTMIN
and VTMAX respectively. When the voltage on the TEMP pin
is outside the window, the charger stops. When the TEMP
pin voltage falls back into the window, the charger starts a
new charge cycle. The VTMIN and VTMAX voltage is
determined by the internal resistor divider, as shown in the
block diagram. See “Battery Pack Temperature Monitoring”
for more information.
The TEMP pin is also used for battery removal detection. It
is assumed that the thermistor is co-packed with the battery.
When the charger sees a TEMP pin voltage that is 2.1V or
higher, it assumes that the battery is removed. When a
battery is removed, a FAULT signal is indicated and
charging is halted. When a battery is inserted again, a new
charge cycle starts.
VBAT (Pin 12, 13, 14)
VBAT is the connection to a battery. Typically a 10µF
Tantalum capacitor is needed for stability when no battery is
attached to this pin. When a battery is connected, however,
no capacitor is required for stability. A 0.1µF ceramic
capacitor is recommended for decoupling.
5