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Linear Technology Electronic Components Datasheet

LTC4002EDD Datasheet

Standalone Li-Ion Switch Mode Battery Charger

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LTC4002
Standalone Li-Ion
Switch Mode Battery Charger
FEATURES
Wide Input Supply Range:
4.7V to 22V – 4.2 Version
8.9V to 22V – 8.4 Version
High Efficiency Current Mode PWM Controller with
500kHz Switching Frequency
±1% Charge Voltage Accuracy
End-of-Charge Current Detection Output
3 Hour Charge Termination Timer
Constant Switching Frequency for Minimum Noise
±5% Charge Current Accuracy
Low 10µA Reverse Battery Drain Current
Automatic Battery Recharge
Automatic Shutdown When Input Supply is Removed
Automatic Trickle Charging of Low Voltage Batteries
Battery Temperature Sensing and Charge
Qualification
Stable with Ceramic Output Capacitor
8-Lead SO and 10-Lead DFN Packages
U
APPLICATIO S
Portable Computers
Charging Docks
Handheld Instruments
DESCRIPTIO
The LTC®4002 is a complete battery charger controller for
one (4.2V) or two (8.4V) cell lithium-ion batteries. With a
500kHz switching frequency, the LTC4002 provides a
small, simple and efficient solution to fast charge Li-Ion
batteries from a wide range of supply voltages. An external
sense resistor sets the charge current with ±5% accuracy.
An internal resistor divider and precision reference set the
final float voltage to 4.2V per cell with ±1% accuracy.
When the input supply is removed, the LTC4002 automati-
cally enters a low current sleep mode, dropping the battery
drain current to 10µA. An internal comparator detects the
near end-of-charge condition while an internal timer sets
the total charge time and terminates the charge cycle. After
the charge cycle ends, if the battery voltage drops below
4.05V per cell, a new charge cycle will automatically begin.
The LTC4002 is available in the 8-lead SO and 10-lead DFN
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
1.5A Single Cell Li-Ion Battery Charger
VIN
5V TO 22V
CHARGE
STATUS
BAT
2k
0.1µF
VCC
GATE
10µF
LTC4002ES8-4.2
CHRG SENSE
6.8µH
68m
0.47µF
2.2k
COMP
NTC
T
BAT
GND
22µF
+ Li-Ion
BATTERY
10k
NTC
4002 TA01
NTC: DALE NTHS-1206N02
Efficiency vs Input Voltage
100
(CURVES INCLUDE
INPUT DIODE)
90
VBAT = 4V
80
VBAT = 3.8V
70
60
5
10
15
20
25
INPUT VOLTAGE (V)
4002 TA02
4002f
1


Linear Technology Electronic Components Datasheet

LTC4002EDD Datasheet

Standalone Li-Ion Switch Mode Battery Charger

No Preview Available !

LTC4002
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage (VCC) .............................................. 24V
GATE .................................................. (VCC – 8V) to VCC
BAT, SENSE .............................................. – 0.3V to 14V
CHRG, NTC ................................................. – 0.3V to 8V
Operating Temperature Range (Note 4) .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (S8 Package)
(Soldering, 10 sec) ........................................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
COMP 1
VCC 2
GATE 3
PGND 4
SGND 5
10 NC
9 NTC
11
8 SENSE
7 BAT
6 CHRG
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD IS GND (PIN 11)
MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
LTC4002EDD-4.2
LTC4002EDD-8.4
DD PART MARKING
LAGG
LBGY
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
COMP 1
VCC 2
GATE 3
GND 4
8 NTC
7 SENSE
6 BAT
5 CHRG
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 110°C/W
ORDER PART
NUMBER
LTC4002ES8-4.2
LTC4002ES8-8.4
S8 PART MARKING
400242
400284
ELECTRICAL CHARACTERISTICS (LTC4002-4.2) The denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. VCC = 10V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
DC Characteristics
VCC
VCC Supply Voltage
ICC
VCC Supply Current
Current Mode
Shutdown Mode
Sleep Mode
4.7
22
V
3
5
mA
3
5
mA
10
20
µA
VBAT(FLT) Battery Regulated Float Voltage
5V VCC 22V (Note 2)
4.168 4.2 4.232
V
4.158
4.242
V
VSNS(CHG) Constant Current Sense Voltage
3V VBAT 4V (Note 3) 0°C TA 85°C 93
100 107
mV
–40°C TA 85°C 90
110
mV
VSNS(TRKL) Trickle Current Sense Voltage
VBAT = 0V (Note 3)
5
10
15
mV
VTRKL
Trickle Charge Threshold Voltage
VBAT Rising
2.75
2.9
3.05
V
VUV
VCC Undervoltage Lockout Threshold Voltage VCC Rising
3.9
4.2
4.5
V
VUV
VCC Undervoltage Lockout Hysteresis Voltage
200
mV
VMSD
Manual Shutdown Threshold Voltage
COMP Pin Falling
200
360
500
mV
VASD
Automatic Shutdown Threshold Voltage
VCC – VBAT
250
mV
ICOMP
COMP Pin Output Current
VCOMP = 1.2V
100
µA
ICHRG
CHRG Pin Weak Pull-Down Current
VCHRG = 1V
15
25
35
µA
VCHRG CHRG Pin Output Low Voltage
ICHRG = 1mA
0.15
0.3
V
REOC
End-of-Charge Ratio
VSNS(EOC)/VSNS(CHG)
10
25
32
%
tTIMER Charge Time Accuracy
10
%
4002f
2


Part Number LTC4002EDD
Description Standalone Li-Ion Switch Mode Battery Charger
Maker Linear
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