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.
θ
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.
2.
θ
JC
, “case temperature” location is at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
Electrical Specifications
PARAMETER
Typical values are tested at V
IN
= 5V and +25°C ambient temperature. Maximum and minimum values are
guaranteed over recommended operating conditions, unless otherwise noted.
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
POWER-ON RESET, OVER VOLTAGE PROTECTION, PRE-REGULATOR
Rising VIN Threshold
Falling VIN Threshold
2.9V Reference Output Voltage
2.9V Reference Output Current
VIN-BAT Comparator Offset
STANDBY CURRENT
VBAT Pin Sink Current
VIN Pin Supply Current
VIN Pin Supply Current
Charger Reverse Current
VOLTAGE REGULATION
Output Voltage
Dropout Voltage
CHARGE CURRENT
Charge/Protection Current
Trickle Charge Current
End-of-Charge Current
CHARGE VOLTAGE THRESHOLDS
Short-Circuit Threshold
Trickle Charge Threshold - Rising
Trickle Charge Threshold - Falling
Recharge Threshold - Falling
Difference from Final Battery Voltage
Open Circuit Test Threshold- Rising
V
OCR
V
SC
V
MIN
V
MIN
V
RECHRG
0.9
2.7
2.6
3.90
-
-
1.0
2.9
2.7
4.00
-210
4.4
1.1
3.2
3.0
4.08
-
-
V
V
V
V
mV
V
I
CHARGE
I
TRICKLE
R
IREF
= 80kΩ, V
BAT
= 3.7V, V
IN
= 5V
R
IREF
= 80kΩ, V
BAT
= 2.0V, V
IN
= 5V
R
IMIN
= 133kΩ
900
85
56
1000
110
63
1100
135
70
mA
mA
mA
V
CH
V
BAT
= 3.7V, I
CHARGE
= 0.65A
4.17
-
4.20
250
4.23
300
V
mV
I
STANDBY
I
VIN1
I
VIN2
VIN floating or EN pin is floating
BAT Pin floating, EN = LOW
BAT Pin floating, EN = HIGH
VIN = 4.3V, VSEN = BAT= 4.5V, EN = HIGH
-
-
-
-
-
1.0
0.5
-
3.0
1.5
1.0
6.0
μA
mA
mA
μA
V2P9
I
LOAD
= 2mA
2.9
2.3
-
-
30
3.4
2.4
2.9
-
-
4.0
2.65
-
30
-
V
V
V
mA
mV
2
FN9215.2
July 30, 2007
ISL6297
Electrical Specifications
PARAMETER
BATTERY TEMPERATURE MONITORING
Low Temperature Threshold
Low Temperature Hysteresis
High Temperature Threshold
High Temperature Hysteresis
DT Pin MOSFET On Resistance
Charge Current Foldback Threshold (Note 4)
Current Foldback Gain (Note 4)
OSCILLATOR
Oscillation Period
LOGIC INPUT AND OUTPUT
EN Input Low
EN Pin External Pull Down to Disable
LED Sink Current (RED, GRN)
LED Leakage Current
NOTES:
3. The actual current may be lower due to the thermal foldback.
4. Limits should be considered typical and are not production tested.
Pin Voltage = 1.0V
-
-
5
-
-
-
10
-
0.8
50
-
1
V
kΩ
mA
μA
t
OSC
C
TIME
= 15nF
2.7
3.0
3.3
ms
R
DT
T
FOLD
G
FOLD
V
TMAX
V2P9 = 2.88V
V
TMIN
V2P9 = 2.88V
1.94
135
.704
160
-
-
-
2.0
167
.718
185
25
100
100
2.06
199
.732
200
-
-
-
V
mV
V
mV
Ω
°C
mA/°C
Typical values are tested at V
IN
= 5V and +25°C ambient temperature. Maximum and minimum values are
guaranteed over recommended operating conditions, unless otherwise noted.
(Continued)
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
3
FN9215.2
July 30, 2007
ISL6297
Pin Description
PIN #
1, 15, 16
2
3
4
5
6
7
8
PIN NAME
VIN
GRN
RED
TIME
GND
DT
EN
V2P9
DESCRIPTION
VIN is the input power source. It is recommended to have a 1Ω resistor in series with the input decoupling capacitor to
prevent an over-shoot voltage when the input cable is plugged in.
Open-drain LED drive pin. This pin sinks a constant-current 10mA to drive a
green
LED in a bi-color LED pack.
Open-drain LED drive pin. This pin sinks a constant-current 10mA to drive a
red
LED in a bi-color LED pack.
Timer Programming Input. The TIME pin determines the oscillation period by connecting a timing capacitor between this
pin and GND. The oscillator provides a time reference for the charger.
GND is the connection to system ground.
Delta Temperature Setting Input. This pin sets the temperature difference before and after the charging starts. This pin can
also be used as an indication whether or not the charger is charging.
Enable Input. Connect EN LOW to enable the charger. Pull it HIGH or leave it floating to disable the charger. This pin is
pulled up to 2.9V when left floating.
Untrimmed 2.9V voltage output. This pin outputs a 2.9V voltage source when the input voltage is above POR threshold,
independent on the EN pin input. The V2P9 output is used to power the LEDs, the NTC circuit, or for other functions. The
maximum output current is 30mA. This output can also be used as an indication for adapter presence.
This is the programming input for the constant charging current in a linear charger. In the typical application of a dual-mode
charger, the IREF pin programs the trickle charge current as well as the protection current level.
IMIN is the programmable input for the end-of-charge current.
Temperature setting input. An external NTC thermistor is connected to this pin for ambient temperature sensing.
Battery remote voltage sensing feedback pin. This pin allows remote sense of the battery pack voltage. Connect this pin
as close as possible to the battery positive terminal with a separate trace to minimize the impact of parasitic resistance.
This pin also serves the function of compensating for voltage drop caused by the connector contact resistance.
BAT is the charger output.
Exposed Pad. This pad is internally connected to GND. Connect as much copper as possible to this pad on the component
or other layers through thermal vias to maximize the thermal performance.
9
10
11
12
IREF
IMIN
TEMP
VSEN
13, 14
-
BAT
EPAD
Typical Application
INPUT
R
IN
C
1
Input
VIN
C
1
V2P9
C
2
R
1
R
T
D
2
D
1
R
S
R
2
DT
TEMP
ISL6297
BAT
TO BATTERY
To Battery
BAT+
BAT-
C
3
VSEN
R
3
EN
C
4
ID
C
TIME
TIME
RED
GRN
GND
IREF
R
IMIN
IMIN
R
IREF
NOTE: Temperature limit components
selected for a temperature Range of -5°C
to +45°C (not charging) See Example,
page 14
C
1
: 1μF X5R CERAMIC CAPACITOR
C
3
: 10μF X5R CERAMIC CAPACITOR
C
2
, C
4
: 0.1μF X5R CERAMIC CAPACITOR
C
TIME
: 22nF X5R OR BETTER TIMING CAPACITOR
D
1
, D
2
: DUAL-COLOR (RED AND GREEN) LED IN ONE PACKAGE
R
IREF
: 80kΩ, 1%
R
IMIN
: 133kΩ, 1%
R
1
: 15kΩ, 1%
R
2
: TBD, VALUE DEPENDENT ON THE DT (1.37kΩ FOR +10°C delta)
R
T
: MURATA NCP18XH103J -- 10kΩ AT +25°C, 5% (0603 SIZE)
R
S
: 41.2Ω
R
3
: 10kΩ, 5% (R
3
AND C
4
ARE FOR IMPROVING ESD PROTECTION)
R
IN
: 1Ω (USED TO PREVENT OVERSHOOT WHEN CONNECTING THE CABLE)
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