ISL78692 Datasheet PDF - Intersil Corporation

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ISL78692
Intersil Corporation

Part Number ISL78692
Description Li-ion/Li-Polymer Battery Charger
Page 18 Pages


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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.



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Block Diagram
ISL78692
VIN
C1
IREF
RIREF
TEMP
TIME
GND
QMAIN
VBAT
TEMPERATURE
MONITORING
IT
IR
CURRENT
REFERENCES
IMIN
QSEN
100000:1
CURRENT
MIRROR
ISEN
REFERENCES
INPUT_OK
+
VIN VBAT
+
-
CHRG
- VPOR
++
100mV
-
+
- VCH
V2P8
TRICKLE/FAST
ISEN
+
- MIN_I
V2P8
NTC
INTERFACE
UNDER-
TEMPERATURE
OVER-
TEMPERATURE
BATT REMOVAL
LOGIC
OSC
COUNTER
+
MINBAT - VMIN
VRECHRG
+
-
RECHARGE
STATUS
STATUS
FAULT
INPUT_OK
FAULT
V2P8
EN
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VIN
TP1
GND1
TP2
J1
1
2
1
2UNNAMED_1_AMP6448032_I352_IN2
2
JP1
UNNAMED_1_AMP2923041_I351_IN1
21
J3
34
TP5
TP6
UNNAMED_1_SMLED_I292_B
D2
UNNAMED_1_SMLED_I291_B
D1
TIME
FAULT
STATUS
VBAT
TP3
TP4 GND2
C7
OPEN
C1
1UF
U1
1 VIN
2 FAULT
3 STATUS
4 TIME
5 GND
11 EPAD
C2
10UF
R4
VBAT
TEMP
IREF
V2P8
EN
10
9
8
7
6
EN
DNP
TEMP
IREF
V2P8
ISL78692-1CR3Z
TP7
TP8
JP2
OUTPUT
J2
123 213UNNAMED_1_AMP6448033
TP9
TP10
1 23
JP4
SW1
1 TIME
2 EN
3 500MA
4 400MA
5 NA
6 TEMP
7 TEMP
8 TEMP
UNNAMED_1_SDA08HX_I326_PIUNN16NAMED_1_SDUAN0N8AHMXE_ID3_216_SPDINA1048HX_I326_PIUNN13NAMED_1_SDUAN0N8AHMXE_ID3_216_SPDIUNAN101N8AHMXE_ID3_216_SPDINA1008HX_I326_PIN9
JP4
1,2 USB 500MA
2,3 USB 100MA
FIGURE 3. ISL78692EVAL1Z SCHEMATIC



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Pin Configuration
ISL78692
ISL78692
(10 LD 3x3 DFN)
TOP VIEW
VIN 1
FAULT 2
STATUS 3
TIME 4
GND 5
10 VBAT
9 TEMP
8 IREF
7 V2P8
6 EN
Pin Descriptions
PIN #
1
2
PIN NAME
VIN
FAULT
3 STATUS
4 TIME
5 GND
6 EN
7 V2P8
8 IREF
9 TEMP
10 VBAT
EPAD
DESCRIPTION
VIN is the input power source.
FAULT is an open-drain output indicating fault status. This pin is pulled to LOW under any fault
conditions.
STATUS is an open-drain output indicating charging and inhibit states. The STATUS pin is pulled LOW
when the charger is charging a battery.
The TIME pin determines the oscillation period by connecting a timing capacitor between this pin and
GND. The oscillator also provides a time reference for the charger.
GND is the connection to system ground.
EN is the enable logic input. Connect the EN pin to LOW to disable the charger or leave it floating to
enable the charger.
The V2P8 is a 2.8V reference voltage output. The 2.8V is present when VIN is above 3.4V typical. If VIN
falls below 2.4V typical the V2P8 output will be at 0V.
This is the programming input for the constant charging current.
TEMP is the input for an external NTC thermistor. The TEMP pin is also used for battery removal
detection.
VBAT is the connection to the battery.
The metal slug on the bottom surface of the package is floating. Tie to system GND.
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP RANGE
(°C)
PACKAGE
(Pb-Free)
PKG
DWG
ISL78692-1CR3Z
8692
-40 to +85
10 Ld 3x3 DFN
L10.3x3
ISL78692EVAL1Z
Evaluation Board for the 3x3 DFN Package Part
NOTE:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. 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 These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC
J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL78692. For more information on MSL, please see Technical Brief
TB363.
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ISL78692 Li-ion/Li-Polymer Battery Charger ISL78692
Intersil Corporation
ISL78692 pdf

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