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Linear Technology Electronic Components Datasheet

LTC4052-4.2 Datasheet

Lithium-Ion Battery Pulse Charger

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FEATURES
s Very Low Power Dissipation: 350mW at 1A
s Complete Standalone Pulse Charger for 1-Cell
Lithium-Ion Batteries
s Requires No Microcontroller, MOSFET or
Blocking Diode
s Sense Resistor Limits Maximum Current for Safety
s Programmable Charge Termination Timer for
Maximum Capacity Charging
s ±1% Float Voltage Accuracy
s Near End-of-Charge (C/10) Detection Output
s AC Wall Adapter Present Output
s Low Battery Drain when Input Supply Is Removed
s Automatic Trickle Charge for Low Battery
s Automatic Battery Refresh
s Thermal Shutdown Protection
s Tiny Thermally Enhanced MSOP Package
U
APPLICATIO S
s Handheld Computers
s Cellular Telephones
s Cradle Chargers
LTC4052-4.2
Lithium-Ion Battery
Pulse Charger with
Overcurrent Protection
DESCRIPTIO
The LTC®4052 is a complete standalone pulse charger
with integrated MOSFET for 1-cell lithium-ion batteries.
An external sense resistor provides overcurrent limiting as
a safety precaution against a user connecting a wall
adapter with the incorrect or no current limit. The internal
MOSFET prevents reverse battery current from flowing if
the input voltage is shorted to ground, eliminating the
need for a blocking diode.
As the battery accepts charge and approaches the
programmed float voltage, the internal MOSFET begins
switching off and on with the duty cycle gradually decreas-
ing as the battery approaches a fully charged condition.
A programmable timer terminates the charge cycle. The
near end-of-charge C/10 condition is indicated at the
CHRG pin when the average charge current falls to one-
tenth of the wall adapter current. Removing the input
voltage puts the LTC4052 into a sleep mode, dropping the
battery current drain to less than 1µA.
The LTC4052 is available in a tiny 8-pin thermally
enhanced MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Single Cell 4.2V, 1A, Standalone Li-Ion Battery Charger
VIN = 4.5V TO 10V
WITH 1A
CURRENT LIMIT
4.7
1µF
1k
CHARGE STATUS
AC PRESENT
3
1k
VIN
LTC4052
6
CHRG
GATE 7
2
ACPR
TIMER
5
CTIMER
0.1µF
1
SENSE
8
BAT
GND
4
10k
0.047µF
RSENSE
0.05
0.022µF
1-CELL 4.2V
Li-Ion
BATTERY
4052 TA01
LTC4052 Charge Profile
4.5
4.0
3.5
3.0
CONSTANT
CURRENT
1.0
CHARGE
CYCLE
ENDS
PULSING
CURRENT
0.5
0
C/10
5
0
0 0.5 1.0 1.5 2.0 2.5 3.0
TIME (HOURS)
4052 • TA01b
405242f
1


Linear Technology Electronic Components Datasheet

LTC4052-4.2 Datasheet

Lithium-Ion Battery Pulse Charger

No Preview Available !

LTC4052-4.2
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VIN)....................................... 12V
BAT Voltage ...............................................– 0.3V to 12V
GATE (Note 2) .............................................– 0.3V to 8V
SENSE, TIMER .................................. – 0.3V to VIN +0.3V
CHRG, ACPR .............................................– 0.3V to 12V
SENSE, BAT Peak Current ...................................... 1.5A
Operating Temperature Range (Note 3) .. – 40°C to 85°C
Junction Temperature (Note 4) ............................. 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SENSE 1
ACPR 2
VIN 3
GND 4
8 BAT
7 GATE
6 CHRG
5 TIMER
MSE EXPOSED PAD PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 35°C/W
EXPOSED PAD IS GROUND.
(MUST BE SOLDERED TO PCB).
ORDER PART
NUMBER
LTC4052EMS8E-4.2
MS8 PART MARKING
LTYY
Consult LTC Marketing for parts specified with wider operating temperature ranges.
DC ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 6V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN
Input Supply Voltage
IIN
Input Quiescent Supply Current
VBAT
Battery Float Voltage
Wall Adapter Open Circuit Voltage
Full Charge Mode
0°C TA 85°C
q 4.5
10
V
q
0.7
1.4
mA
4.158 4.200 4.242
V
q 4.137 4.200 4.242
V
VRECHRG Recharge Battery Voltage Threshold
Battery Voltage Falling 0°C TA 85°C
3.990 4.050 4.110
V
q 3.969 4.050 4.110
V
VMARGIN
VIMAX
ITRICKLE
VTRICKLE
RDS(ON)
VGATE
TTIMER
ILEAK
VSLEEP
VACPR
I LEAKACPR
VCHRG
I LEAKCHRG
ICHRG
VBAT – VRECHRG Margin
Overcurrent Trip Sense Voltage
Trickle Charge Current
VBAT = 2V
Trickle Charge Threshold Voltage
VBAT Rising
Internal Switch On-Resistance
VBAT = 2.6V
VBAT = 4V
GATE Pin Voltage
VBAT = 2.6V
VBAT = 4V
TIMER Period Accuracy
CTIMER = 0.1µF, Full Charge Mode
Battery Leakage Current Through Charger VBAT = 4V, VIN = 0V
Sleep Threshold Voltage
(VIN – VBAT) Low to High
(VIN – VBAT) High to Low
ACPR Pin Output Low Voltage
IACPR = 3mA
ACPR Pin Leakage Current
VIN = 0, VACPR = 6V
CHRG Pin Output Low Voltage
ICHRG = 3mA, Charging, C/10 Not Reached
CHRG Pin Leakage Current
VIN = 0, VCHRG = 6V
CHRG Pin Weak Pull-Down Current
VCHRG = 1V, Charging, C/10 Reached
q 75
150 225
mV
q 90
105 120
mV
q 14
24
34
mA
q 2.35 2.45 2.55
V
0.45 0.7
0.35 0.5
6.5
V
10.5
V
±10
%
q
1
µA
20
45
70
mV
0
15
mV
q
0.5
0.8
V
q
1
µA
q
0.5
0.8
V
q
1
µA
20
40
70
µA
405242f
2


Part Number LTC4052-4.2
Description Lithium-Ion Battery Pulse Charger
Maker Linear
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