¬
ISL6292
Data Sheet December 17, 2007
Li-ion/Li Polymer Battery Charger
The ISL6292 is an integrated single-cell Li-ion or Li-polymer
battery charger capable of operating with an input voltage as
low as 2.4V. This charger is designed to work with various
types of AC adapters or a USB port.
The ISL6292 operates as a linear charger when the AC
adapter is a voltage source. The battery is charged in a
CC/CV (constant current/const ant voltage) profile. The
charge current is programmable with an external resistor up
to 2A. The ISL6292 can also work with a current-limited
adapter to minimize the thermal dissipation, in which case,
the ISL6292 combines the benefits of both a linear charger
and a pulse charger.
The ISL6292 features charge current thermal foldback to
guarantee safe operation when the printed circuit board is
space limited for thermal dissipation. Additional features
include 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 or DFN packages.
Pinouts
ISL6292
(16 LD QFN)
TOP VIEW
VIN
VIN
VBAT
VBAT
12
11
10
9
6578
EN
V2P8
TOEN
VBAT
TEMP
IMIN
IREF
VIN
FAULT
STATUS
TIME
16 14 13
15
1
2
3
4
GND
FN9105.9
Features
• Complete Charger for Single-Cell Li-ion Batteries
• Very Low Thermal Dissipation
• Integrated Pass Element and Current Sensor
• No External Blocking Diode Required
• 1% Voltage Accuracy
• Programmable Current Limit up to 2A
• Programmable End-of-Charge Current
• Charge Current Thermal Foldback
• NTC Thermistor Interface for Battery Temperature Monitor
• Accepts Multiple T ypes of Adapters or USB BUS Power
• Guaranteed to Operate at 2.65V After Start-Up
• Ambient Temperature Range: -20°C to +70°C
• Thermally-Enhanced QFN Packages
• Handheld Devices, including Medical Handhelds
• PDAs, Cell Phones and Smart Phones
• Portable Instruments, MP3 Players
• Self-Charging Battery Packs
• Stand-Alone Chargers
• USB Bus-Powered Chargers
• Pb-Free Available (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”
VIN
FAULT
STATUS
TIME
GND
ISL6292
(10 LD DFN)
TOP VIEW
1
2
3
4
5
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
10
VBAT
9
TEMP
8
IREF
7
V2P8
6
EN
1
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.
All other trademarks mentioned are the property of their respective owners.
Copyright Intersil Americas Inc. 2003-2007. All Rights Reserved
2
ISL6292
Absolute Maximum Ratings Thermal Information
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 7V
Output Pin Voltage (BAT). . . . . . . . . . . . . . . . . . . . . . . -0.3V to 5.5V
Signal Input Voltage (TOEN, TIME, IREF, IMIN) . . . . . -0.3V to 3.2V
Output Pin Voltage (STATUS, FAULT). . . . . . . . . . . . . . .-0.3V to 7V
Charge Current (For 4x4 or 5x5 QFN Packages) . . . . . . . . . . . 2.1A
Charge Current (For 3x3 DFN Package) . . . . . . . . . . . . . . . . . 1.6A
Recommended Operating Conditions
Ambient Temperature Range. . . . . . . . . . . . . . . . . . .-20°C to +70°C
Supply Voltage, VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 6.5V
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:
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
1. θ
JA
Tech Brief TB379.
, “case temperature” location is at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
2. θ
JC
Thermal Resistance (Junction to Ambient) θ
(°C/W) θJC (°C/W)
JA
5x5 QFN Package (Notes 1, 2) . . . . . . 34 4
4x4 QFN Package (Notes 1, 2) . . . . . . 41 4
3x3 DFN Package (Notes 1, 2) . . . . . . 46 4
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
Electrical Specifications Typical values are tested at V
= 5V and +25°C Ambient Temperature, maximum and minimum values are
IN
guaranteed over 0°C to +70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless
otherwise noted.
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
POWER-ON RESET
Rising VIN Threshold 3.0 3.4 4.0 V
Falling VIN Threshold 2.11 2.4 2.65 V
STANDBY CURRENT
VBAT Pin Sink Current I
STANDBY
VIN Pin Supply Current I
VIN Pin Supply Current I
VIN
VIN
VIN floating or EN = LOW - - 3.0 µA
VBAT floating and EN pulled low - 30 - µA
VBAT floating and EN floating - 1 - mA
VOLTAGE REGULATION
Output Voltage V
Output Voltage V
CH
CH
ISL6292-1 4.059 4.10 4.141 V
ISL6292-2 4.158 4.20 4.242 V
Dropout Voltage VBAT = 3.7V, 0.5A, 4x4 or 5x5 package - 140 - mV
Dropout Voltage VBAT = 3.7V, 0.5A, 3x3 package - 175 - mV
CHARGE CURRENT
Constant Charge Current I
Trickle Charge Current I
Constant Charge Current I
Trickle Charge Current I
Constant Charge Current I
Trickle Charge Current I
CHARGERIREF
TRICKLE
CHARGE
TRICKLE
CHARGE
TRICKLE
End-of-Charge Threshold R
= 80kΩ, V
R
= 80kΩ, V
IREF
IREF Pin Voltage > 1.2V, V
IREF Pin Voltage > 1.2V, V
IREF Pin Voltage < 0.4V, V
IREF Pin Voltage < 0.4V, V
= 80kΩ 85 110 135 mA
IMIN
= 3.7V 0.9 1.0 1.1 A
BAT
= 2.0V - 110 - mA
BAT
= 3.7V 400 450 520 mA
BAT
= 2.0V - 45 - mA
BAT
= 3.7V - - 100 mA
BAT
= 2.0V - 10 - mA
BAT
RECHARGE THRESHOLD
Recharge Voltage Threshold V
Recharge Voltage Threshold V
RECHRG
RECHRG
ISL6292-2 - 4.0 - V
ISL6292-1 - 3.90 - V
3
FN9105.9
December 17, 2007
ISL6292
Electrical Specifications Typical values are tested at V
guaranteed over 0°C to +70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless
= 5V and +25°C Ambient Temperature, maximum and minimum values are
IN
otherwise noted. (Continued)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
TRICKLE CHARGE THRESHOLD
Trickle Charge Threshold Voltage V
MIN
2.7 2.8 3.0 V
TEMPERATURE MONITORING
Low Battery Temperature Threshold V
High Battery Temperature Threshold V
Battery Removal Threshold V
Charge Current Foldback Threshold T
Current Foldback Gain G
TMIN
TMAX
RMV
FOLD
FOLD
V2P8 = 3.0V 1.45 1.51 1.57 V
V2P8 = 3.0V 0.36 0.38 0.40 V
V2P8 = 3.0V - 2.25 - V
85 100 115 °C
-100-mA/°C
OSCILLATOR
C
Oscillation Period t
OSC
= 15nF 2.4 3.0 3.6 ms
TIME
LOGIC INPUT AND OUTPUT
TOEN Input High 2.0 - - V
TOEN and EN Input Low --0.8V
IREF and IMIN Input High 1.2 - - V
IREF and IMIN Input Low --0.4V
STATUS/FAULT Sink Current Pin Voltage = 0.8V 5 - - mA
Typical Operating Performance The test conditions for the Typical Operating Performance are: V
R
IREF
4.2015
4.2010
R
4.2005
4.2000
(V)
4.1995
BAT
V
4.1990
4.1985
4.1980
4.1975
0 0.3 0.6 0.9 1.2 1.5
CHARGE CURRENT (A)
IREF
= 40kΩ
FIGURE 1. CHARGER OUTPUT VOLTAGE vs CHARGE
CURRENT
= R
IMIN
= 80kΩ, V
= 3.7V, Unless Otherwise Noted.
BAT
4.210
4.208
4.206
4.204
4.202
(V)
4.200
BAT
4.198
V
4.196
4.194
4.192
4.190
0 20 40 60 80 100 120
CHARGE CURRENT = 50mA
TEMPERATURE (°C)
FIGURE 2. CHARGER OUTPUT VOLTAGE vs TEMPERATURE
= 5V, TA = +25°C,
IN
4
FN9105.9
December 17, 2007
ISL6292
Typical Operating Performance The test conditions for the Typical Operating Performance are: V
R
IREF
4.30
CHARGE CURRENT = 50mA
4.25
(V)
4.20
BAT
V
4.15
4.10
4.2 4.5 4.8 5.1 5.4 5.7 6.0 6.3
VIN (V)
FIGURE 3. CHARGER OUTPUT VOLT AGE vs INPUT
= R
IMIN
= 80kΩ, V
= 3.7V, Unless Otherwise Noted. (Continued)
BAT
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
CHARGE CURRENT (A)
0.4
0.2
USB500
0
3.0 3.2 3.4 3.6 3.8 4.0
0.5A
V
FIGURE 4. CHARGE CURRENT vs OUTPUT VOLTAGE
1A
BAT
IN
1.5A
USB100
(V)
= 5V, TA = +25°C,
2A
VOLTAGE CHARGE CURRENT = 50mA
1.6
1.4
1.2
1.0
0.8
0.6
0.5A
0.4
CHARGE CURRENT (A)
0.2
0.0
0 20 40 60 80 100 120
1.5A
1.0A
TEMPERATURE (°C)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
CHARGE CURRENT (A)
0.4
0.2
0
4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1 6.3 6.5
USB100
1.5A
0.5A
1A
USB500
VIN (V)
2A
FIGURE 5. CHARGE CURRENT vs AMBIENT TEMPERATURE FIGURE 6. CHARGE CURRENT vs INPUT VOLTAGE
2.930
2.928
)
V
(
E
2.926
G
A
T
L
O
V
2.924
8
P
2
V
2.922
2.920
3.5 4.0 4.5 5.0 5.5 6.0 6.5
V2P8 PIN LOADED WITH 2mA
(V)
V
IN
3.00
2.95
)
V
(
2.90
E
G
TA
2.85
L
O
V
8
2.80
P
2
V
2.75
2.70
0246810
V2P8 LOAD CURRENT (mA)
FIGURE 7. V2P8 OUTPUT vs INPUT VOLTAGE FIGURE 8. V2P8 OUTPUT vs ITS LOAD CURRENT
5
December 17, 2007
FN9105.9
ISL6292
Typical Operating Performance The test conditions for the Typical Operating Performance are: V
R
= R
IREF
700
650
600
550
500
(mΩ)
450
400
DS(ON)
r
350
300
250
200
FIGURE 9. r
1.8
1.6
1.4
1.2
1.0
0.8
0.6
LEAKAGE CURRENT (µA)
0.4
BAT
V
0.2
0.0
THERMAL FOLDBACK STARTS
NEAR +100°C
3x3 DFN
4x4 QFN
0 20 40 60 80 100 120
TEMPERATURE (°C)
vs TEMPERATURE AT 3.7V OUTPUT FIGURE 10. r
DS(ON)
0 20 40 60 80 100 120
TEMPERATURE (°C)
FIGURE 11. REVERSE CURRENT vs TEMPERATURE FIGURE 12.
IMIN
= 80kΩ, V
= 3.7V, Unless Otherwise Noted. (Continued)
BAT
420
400
380
360
(mΩ)
340
320
DS(ON)
r
300
280
260
3.0 3.2 3.4 3.6 3.8 4.0
vs OUTPUT VOLTAGE USING CURRENT
DS(ON)
LIMITED ADAPTERS
50
EN = GND
45
40
35
30
25
20
15
QUIESCENT CURRENT (µA)
10
IN
V
5
0
0 20 40 60 80 100 120
500mA CHARGE CURRENT,
R
IREF
4x4 QFN
V
BAT
TEMPERATURE (°C)
INPUT QUIESCENT CURRENT vs TEMPERATURE
= 5V, TA = +25°C,
IN
= 40kΩ
(V)
3x3 DFN
32
30
EN = GND
28
26
24
22
20
18
16
14
QUIESCENT CURRENT (µA)
IN
12
V
10
3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
VIN (V)
FIGURE 13. INPUT QUIESCENT CURRENT vs INPUT
VOLTAGE WHEN SHUTDOWN
6
1.10
1.05
1.00
0.95
0.90
QUIESCENT CURRENT (mA)
0.85
IN
V
0.80
4.3 4.6 4.9 5.2 5.5 5.8 6.1 6.4
BOTH VBAT AND EN
PINS FLOATING
VIN (V)
FIGURE 14. INPUT QUIESCENT CURRENT vs INPUT
VOLTAGE WHEN NOT SHUTDOWN
December 17, 2007
FN9105.9