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PDF ISL78692 Data sheet ( Hoja de datos )
| Número de pieza | ISL78692 | |
| Descripción | Li-ion/Li-Polymer Battery Charger | |
| Fabricantes | Intersil Corporation | |
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DATASHEET
Li-ion/Li-Polymer Battery Charger
ISL78692
The ISL78692 is an integrated single-cell Li-ion or Li-polymer
battery charger capable of operating with an input voltage
as low as 2.65V (cold crank case). This charger is designed to
work with various types of AC adapters or a USB port.
The ISL78692 operates as a linear charger when the AC
adapter is a voltage source. The battery is charged in a CC/CV
(constant current/constant voltage) profile. The charge current
is programmable with an external resistor up to 1A. The
ISL78692 can also work with a current-limited adapter to
minimize the thermal dissipation.
The ISL78692 features charge current thermal foldback to
guarantee safe operation when the printed circuit board’s
thermal dissipation is limited due to space constraints.
Additional features include preconditioning of an
over-discharged battery, an NTC thermistor interface for
charging the battery in a safe temperature range and
automatic recharge. The device is specified for operation in
ambient temperatures from -40°C to +85°C and is offered in
a 3x3mm thermally enhanced DFN package.
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”
• UG001, “ISL78692EVAL1Z Evaluation Board User Guide”
Features
• Complete charger for single-cell Lithium chemistry batteries
• Integrated power transistor and current sensor
• Reverse battery leakage 700nA
• 1% initial voltage accuracy
• Programmable CC current up to 1A
• Charge current thermal foldback
• NTC thermistor interface for battery temperature alert
• Accepts CV and CC types of adapters or USB bus power
• Preconditioning trickle charge
• Guaranteed to operate down to 2.65V after start-up
• Ambient temperature range: -40°C to +85°C
• AEC Q100 qualified
Applications
• Automotive systems
• eCall systems
• Backup battery systems
5V
C1
10µF
EN
R1
100k
ISL78692
R1
100k
VIN
FAULT
VBAT
TEMP
STATUS
V2P8
EN IREF
CTIME
15nF
TIME
GND
R1
160k
R1
1k
C3
1µF
BATTERY
PACK
C2
2x10µF
+
-
TRICKLE
MODE
CONSTANT
CURRENT
MODE
VIN
INPUT VOLTAGE
VCH
VTRICKLE
ICHARGE
CONSTANT
VOLTAGE
MODE
INHIBIT
BATTERY VOLTAGE
CHARGE CURRENT
ICHARGE/10
TIMEOUT
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. TYPICAL CHARGE CURVES USING A CONSTANT
VOLTAGE ADAPTER
September 10, 2014
FN8692.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL78692
Absolute Maximum Ratings
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 7.0V
Output Pin Voltage (VBAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 5.5V
Output Pin Voltage (V2P8). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 3.2V
Signal Input Voltage (EN, TIME, IREF, TEMP). . . . . . . . . . . . . . .-0.3V to 3.2V
Output Pin Voltage (STATUS, FAULT). . . . . . . . . . . . . . . . . . . . . .-0.3V to 7.0V
Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6A
ESD Rating:
Human Body Model (Tested per AEC-Q100-002). . . . . . . . . . . . . . . . . . 4kV
Charge Device Model (Tested per AEC-Q100-011) . . . . . . . . . . . . . 1.25kV
Latch-up (Per JESD78D; Class 2, Level A, AEC-Q100-004) . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
3x3 DFN Package (Notes 4, 5) . . . . . . . . . .
46
4
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..4.3V to 5.5V
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:
4. 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.
5. JC, “case temperature” location is at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
Electrical Specifications Typical values are tested at VIN = 5V and at an Ambient Temperature of +25°C. Unless otherwise noted.
Boldface limits apply across the operating temperature range, -40°C to +85°C and VIN range of 4.3V to 5.5V (see Note 6).
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 6) TYP (Note 6) UNITS
POWER-ON RESET
Rising VIN Threshold
Falling VIN Threshold
STANDBY CURRENT
3.0 3.4 4.0
2.11 2.4 2.65
V
V
VBAT Pin Leakage
VIN Pin Standby Current
VIN Pin Quiescent Current
VOLTAGE REGULATION
IVBLKG
IINSBY
IQ
VBAT = 5.5V, VIN = 0V, EN = 0.8V
VBAT OPEN, VIN = 5.0V, EN = 0.8V
VBAT OPEN, VIN = 5.5V, EN FLOAT
0.7 3.0 µA
30 200 µA
1 mA
Output Voltage
Dropout Voltage
CHARGE CURRENT
VCH VBAT OPEN
VDO VBAT = 3.7V, IIN = 500mA
4.015 4.10 4.185
270 450
V
mV
Constant Charge Current (Note 8)
Trickle Charge Current
Constant Charge Current (Note 8)
Trickle Charge Current
Constant Charge Current (Note 8)
Trickle Charge Current
End-of-Charge Current
RECHARGE THRESHOLD
ICHARGE
ITRICKLE
ICHARGE
ITRICKLE
ICHARGE
ITRICKLE
IEOC
RIREF = 160kΩ, VBAT = 3.7V
RIREF = 160kΩ, VBAT = 2.4V
IREF pin voltage > 1.2V, VBAT = 3.7V
IREF pin voltage > 1.2V, VBAT = 2.4V
IREF pin voltage < 0.4V, VBAT = 3.7V
IREF pin voltage < 0.4V, VBAT = 2.4V
430 500 570 mA
55 mA
390 450 540 mA
45 mA
65 80 104 mA
10 mA
35 60 100 mA
Recharge Voltage Falling Threshold
TRICKLE CHARGE THRESHOLD
VRECHRG
3.7 3.9 4.05
V
Trickle Charge Threshold Voltage
VTRICKLE
2.7 2.8 3.0
V
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5
FN8692.0
September 10, 2014
5 Page 
ISL78692
After the charge current drops below I(EOC) programmed to 1/10
of IREF; see “End-of-Charge (EOC) Current” on page 12 for more
detail), the ISL78692 indicates the end-of-charge (EOC) with the
STATUS pin. 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. Signals in a charge cycle are illustrated
in Figure 20 between points t2 to t5.
VIN
V2P8
POR THRESHOLD
CHARGE CYCLE
CHARGE CYCLE
STATUS
FAULT
VBAT
15 CYCLES TO
1/8 TIMEOUT
VCH
VTRICKLE
VRECHRG
15 CYCLES
ICHARGE
IEOC
T0 T1 T2 T3
T4
T5 T6 T7
FIGURE 20. OPERATION WAVEFORMS
T8
The following events initiate a new charge cycle:
• POR
• A new battery being inserted (detected by TEMP pin)
• The battery voltage drops below a recharge threshold after
completing a charge cycle
• Recovery from an battery over-temperature fault
• Or, the EN pin is toggled from GND to floating
• Further description of these events are given later in this
datasheet
Recharge
After a charge cycle completes, charging is prohibited until the
battery voltage drops to a recharge threshold, VRECHRG of 3.9V
(TYP), (see “Electrical Specifications” on page 5”). Then a new
charge cycle starts at point t6 and ends at point t8, as shown in
Figure 20. The safety timer is reset at t6.
Internal Oscillator
The internal oscillator establishes a timing reference. The
oscillation period is programmable with an external timing
capacitor, CTIME, as shown in Figure 1. 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 given by
Equation 3:
tOSC = 0.2 106 CTIME
seconds
(EQ. 3)
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.
Total Charge Time
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 in Equation 4:
TIMEOUT
=
222
t--O-----S----C-6----0-S----E----C----
=
14 -C----T----I--M----E-- minutes
1nF
(EQ. 4)
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 charge and the FAULT pin goes low. 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 enable it again.
The trickle charge mode has a time limit of 1/8 TIMEOUT. If the
battery voltage does not reach VTRICKLE within this limit, a
TIMEOUT fault is issued and the charger latches off. The charger
stays in trickle mode for at least 15 cycles of the internal
oscillator and, at most, 1/8 of TIMEOUT, as shown in Figure 20.
Charge Current Programming
The charge current is programmed by the IREF pin. There are
three ways to program the charge current:
1. Driving the IREF pin above 1.2V
2. Driving the IREF pin below 0.4V,
3. Or using the RIREF as shown in “TYPICAL APPLICATION” on
page 1.
The voltage of IREF is regulated to a 0.8V reference voltage when
not driven by any external source. The charging current during the
constant current mode is 100,000 times that of the current in
the RIREF resistor. Hence, depending on how IREF pin is used, the
charge current is given by Equation 5:
500 m A
IREF=
---0---.--8----V----- 105A
RIREF
80 m A
VIREF 1.2V
RIREF
VIREF 0.4V
(EQ. 5)
The internal reference voltage at the IREF pin is capable of sourcing
less than 100µA current. When pulling down the IREF pin with a
logic circuit, the logic circuit must be able to sink at least 100µA
current. For design purposes, a designer should assume a tolerance
of ±20% when computing the minimum and maximum charge
current from Equation 5.
When the adapter is current limited, it is recommended that the
reference current be programmed to at least 30% higher than the
adapter current limit (which equals the charge current). In addition,
the charge current should be at least 350mA, which the voltage
difference between the VIN and the VBAT pins is higher than 100mV.
The 100mV is the offset voltage of the input/output voltage
comparator shown in “Block Diagram” on page 2.
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FN8692.0
September 10, 2014
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ISL78692.PDF ] | |
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