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Linear Technology Electronic Components Datasheet

LTC4002-4.2 Datasheet

Standalone Li-Ion Switch Mode Battery Charger

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Final Electrical Specifications
LTC4002-4.2
Standalone Li-Ion
Switch Mode Battery Charger
FEATURES
DESCRIPTIO
June 2003
s Wide Input Supply Range: 4.7V to 24V
s High Efficiency Current Mode PWM Controller with
500kHz Switching Frequency
s ±1% Charge Voltage Accuracy
s End-of-Charge Current Detection Output
s 3 Hour Charge Termination Timer
s Constant Switching Frequency for Minimum Noise
s ±5% Charge Current Accuracy
s Low 10µA Reverse Battery Drain Current
s Automatic Battery Recharge
s Automatic Shutdown When Input Supply is Removed
s Automatic Trickle Charging of Low Voltage Batteries
s Battery Temperature Sensing and Charge
Qualification
s Stable with Ceramic Output Capacitor
s 8-Lead SO and 10-Lead DFN Packages
U
APPLICATIO S
s Portable Computers
s Charging Docks
s Handheld Instruments
The LTC®4002-4.2 is a complete battery charger controller
for single cell 4.2V lithium-ion batteries. With a 500kHz
switching frequency, the LTC4002-4.2 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 with ±1% accuracy.
When the input supply is removed, the LTC4002-4.2
automatically 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, a new charge cycle will automatically
begin.
The LTC4002-4.2 is available in the 8-lead SO and 10-lead
DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN
5V TO 24V
B330B-13
CHARGE
STATUS
BAT
2k
0.1µF
CER
2
VCC
3
GATE
Si6435ADQ
10µF
CER
LTC4002ES8-4.2
57
CHRG SENSE
L1
6.8µH
B330B-13
1
0.47µF
2.2k
68m
COMP
BAT 6
NTC GND
84
22µF
CER
+ Li-Ion
BATTERY
T
10k
NTC
400242 F01
NTC: DALE NTHS-1206N02
Figure 1. 1.5A Single Cell Li-Ion Battery Charger
Efficiency vs Input Voltage
100
ICHRG = 1.5A
RSENSE = 68m
(CURVES INCLUDE
90 INPUT DIODE)
VBAT = 4V
80 VBAT = 3.8V
70
60
5
10 15 20
INPUT VOLTAGE (V)
25
400242 TA02
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
400242i
1


Linear Technology Electronic Components Datasheet

LTC4002-4.2 Datasheet

Standalone Li-Ion Switch Mode Battery Charger

No Preview Available !

LTC4002-4.2
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage (VCC) .............................................. 24V
GATE .................................................. (VCC – 8V) to VCC
BAT, SENSE .............................................. – 0.3V to 14V
CHRG, COMP, NTC ..................................... – 0.3V to 8V
Operating Temperature Range (Note 2) .. – 40°C to 85°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
COMP
VCC
GATE
PGND
SGND
1
2
3
4
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
DD PART MARKING
LAGG
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
S8 PART MARKING
400242
ELECTRICAL CHARACTERISTICS The q 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
q 4.7
24
35
35
10 20
V
mA
mA
µA
VBAT Battery Regulated Float Voltage
5V VCC 24V (Note 2)
4.168 4.2 4.232
q 4.158
4.242
V
V
VSNS(CHG) Constant Current Sense Voltage
3V VBAT 4V (Note 3) 0°C TA 85°C q 93
–40°C TA 85°C q 90
100 107
110
VSNS(TRKL) Trickle Current Sense Voltage
VBAT = 0V (Note 3)
5 10 15
VTRKL
Trickle Charge Threshold Voltage
VBAT Rising
2.75 2.9 3.05
VUV VCC Undervoltage Lockout Threshold Voltage VCC Rising
3.9 4.2 4.5
VUV
VCC Undervoltage Lockout Hysteresis Voltage
200
VMSD
Manual Shutdown Threshold Voltage
COMP Pin Falling
200 360 500
VASD Automatic Shutdown Threshold Voltage
VCC – VBAT
250
ICOMP
COMP Pin Output Current
VCOMP = 1.2V
100
ICHRG
CHRG Pin Weak Pull-Down Current
VCHRG = 1V
15 25 35
VCHRG CHRG Pin Output Low Voltage
ICHRG = 1mA
0.15 0.3
REOC End-of-Charge Ratio
VSNS(EOC)/VSNS(CHG)
10 25 32
tTIMER Charge Time Accuracy
10
mV
mV
mV
V
V
mV
mV
mV
µA
µA
V
%
%
400242i
2


Part Number LTC4002-4.2
Description Standalone Li-Ion Switch Mode Battery Charger
Maker Linear Technology
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