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LTC4002
1
4002f
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
Portable Computers
Charging Docks
Handheld Instruments
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 10A 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
Standalone Li-Ion
Switch Mode Battery Charger
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 10A. 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.
6.8H
22F
+
4002 TA01
NTC: DALE NTHS-1206N02
10F
0.1F
0.47F
2.2k
68m
Li-Ion
BATTERY
10k
NTC
SENSE
GATE
BAT
CHRG
LTC4002ES8-4.2
V
CC
V
IN
5V TO 22V
BAT
NTC
GND
COMP
2k
CHARGE
STATUS
T
1.5A Single Cell Li-Ion Battery Charger
INPUT VOLTAGE (V)
5
EFFICIENCY (%)
80
V
BAT
= 4V
90
25
4002 TA02
70
60
10
15
20
100
V
BAT
= 3.8V
(CURVES INCLUDE
INPUT DIODE)
Efficiency vs Input Voltage
LTC4002
2
4002f
Supply Voltage (V
CC
) .............................................. 24V
GATE .................................................. (V
CC
8V) to V
CC
BAT, SENSE .............................................. 0.3V to 14V
CHRG, NTC ................................................. 0.3V to 8V
ORDER PART
NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC4002EDD-4.2
LTC4002EDD-8.4
ABSOLUTE AXI U
RATI GS
W
W
W
U
PACKAGE/ORDER I FOR ATIO
U
U
W
(Note 1)
T
JMAX
= 125C,
JA
= 110C/W
1
2
3
4
8
7
6
5
TOP VIEW
NTC
SENSE
BAT
CHRG
COMP
V
CC
GATE
GND
S8 PACKAGE
8-LEAD PLASTIC SO
DD PART MARKING
LAGG
LBGY
Operating Temperature Range (Note 4) .. 40C to 85C
Storage Temperature Range ................. 65C to 125C
Lead Temperature (S8 Package)
(Soldering, 10 sec) ........................................... 300C
TOP VIEW
11
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
NC
NTC
SENSE
BAT
CHRG
COMP
V
CC
GATE
PGND
SGND
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 T
A
= 25C. V
CC
= 10V unless otherwise noted.
T
JMAX
= 125C,
JA
= 43C/W
EXPOSED PAD IS GND (PIN 11)
MUST BE SOLDERED TO PCB
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DC Characteristics
V
CC
V
CC
Supply Voltage
4.7
22
V
I
CC
V
CC
Supply Current
Current Mode
3
5
mA
Shutdown Mode
3
5
mA
Sleep Mode
10
20
A
V
BAT(FLT)
Battery Regulated Float Voltage
5V V
CC
22V (Note 2)
4.168
4.2
4.232
V
4.158
4.242
V
V
SNS(CHG)
Constant Current Sense Voltage
3V V
BAT
4V (Note 3)
0C T
A
85C
93
100
107
mV
40C T
A
85C
90
110
mV
V
SNS(TRKL)
Trickle Current Sense Voltage
V
BAT
= 0V (Note 3)
5
10
15
mV
V
TRKL
Trickle Charge Threshold Voltage
V
BAT
Rising
2.75
2.9
3.05
V
V
UV
V
CC
Undervoltage Lockout Threshold Voltage
V
CC
Rising
3.9
4.2
4.5
V
V
UV
V
CC
Undervoltage Lockout Hysteresis Voltage
200
mV
V
MSD
Manual Shutdown Threshold Voltage
COMP Pin Falling
200
360
500
mV
V
ASD
Automatic Shutdown Threshold Voltage
V
CC
V
BAT
250
mV
I
COMP
COMP Pin Output Current
V
COMP
= 1.2V
100
A
I
CHRG
CHRG Pin Weak Pull-Down Current
V
CHRG
= 1V
15
25
35
A
V
CHRG
CHRG Pin Output Low Voltage
I
CHRG
= 1mA
0.15
0.3
V
R
EOC
End-of-Charge Ratio
V
SNS(EOC)
/V
SNS(CHG)
10
25
32
%
t
TIMER
Charge Time Accuracy
10
%
LTC4002
3
4002f
ELECTRICAL CHARACTERISTICS
(LTC4002-4.2) The
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25C. V
CC
= 10V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
NTC
NTC Pin Output Current
V
NTC
= 0.85V
75
85
95
A
V
NTC-HOT
NTC Pin Threshold Voltage (Hot)
V
NTC
Falling
340
355
370
mV
Hysteresis
25
mV
V
NTC-COLD
NTC Pin Threshold Voltage (Cold)
V
NTC
Rising
2.428
2.465
2.502
V
Hysteresis
170
mV
V
RECHRG
Recharge Battery Voltage Offset from Full
V
BAT(FULLCHARGED)
V
RECHRG
, V
BAT
Falling
100
150
200
mV
Charged Battery Voltage
I
LEAK
CHRG Pin Leakage Current
V
CHRG
= 8V, Charging Stops
1
A
Oscillator
f
OSC
Switching Frequency
450
500
550
kHz
DC
Maximum Duty Cycle
100
%
Gate Drive
t
r
Rise Time
C
GATE
= 2000pF, 10% to 90%
20
ns
t
f
Fall Time
C
GATE
= 2000pF, 90% to 10%
50
ns
V
GATE
Output Clamp Voltage
V
CC
V
GATE
, V
CC
9V
8
V
V
GATEHI
Output High Voltage
V
GATEHI
= V
CC
V
GATE
, V
CC
7V
0.3
V
V
GATELO
Output Low Voltage
V
GATELO
= V
CC
V
GATE
, V
CC
7V
4.5
V
(LTC4002-8.4) The
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at
T
A
= 25C. V
CC
= 12V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DC Characteristics
V
CC
V
CC
Supply Voltage
8.9
22
V
I
CC
V
CC
Supply Current
Current Mode
3
5
mA
Shutdown Mode
3
5
mA
Sleep Mode
10
20
A
V
BAT(FLT)
Battery Regulated Float Voltage
9V V
CC
22V (Note 2)
8.336
8.4
8.464
V
8.316
8.484
V
V
SNS(CHG)
Constant Current Sense Voltage
95
100
105
mV
6V V
BAT
8V (Note 3)
93
100
107
mV
V
SNS(TRKL)
Trickle Current Sense Voltage
V
BAT
= 0V (Note 3)
5
10
15
mV
V
TRKL
Trickle Charge Threshold Voltage
V
BAT
Rising
4.7
5
5.3
V
V
UV
V
CC
Undervoltage Lockout Threshold Voltage
V
CC
Rising
7.5
8.5
V
V
UV
V
CC
Undervoltage Lockout Hysteresis Voltage
500
mV
V
MSD
Manual Shutdown Threshold Voltage
COMP Pin Falling
200
350
500
mV
V
ASD
Automatic Shutdown Threshold Voltage
V
CC
V
BAT
250
mV
I
COMP
COMP Pin Output Current
V
COMP
= 1.2V
100
A
I
CHRG
CHRG Pin Weak Pull-Down Current
V
CHRG
= 1V
15
25
35
A
V
CHRG
CHRG Pin Output Low Voltage
I
CHRG
= 1mA
0.15
0.3
V
R
EOC
End-of-Charge Ratio
V
SNS(EOC)
/V
SNS(CHG)
5
10
15
%
t
TIMER
Charge Time Accuracy
10
%
I
NTC
NTC Pin Output Current
V
NTC
= 0.85V
75
85
95
A
LTC4002
4
4002f
ELECTRICAL CHARACTERISTICS
(LTC4002-8.4) The
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25C. V
CC
= 12V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
NTC-HOT
NTC Pin Threshold Voltage (Hot)
V
NTC
Falling
340
355
370
mV
Hysteresis
25
mV
V
NTC-COLD
NTC Pin Threshold Voltage (Cold)
V
NTC
Rising
2.428
2.465
2.502
V
Hysteresis
170
mV
V
RECHRG
Recharge Battery Voltage Offset from Full
V
BAT(FULLCHARGED)
V
RECHRG
, V
BAT
Falling
200
300
400
mV
Charged Battery Voltage
I
LEAK
CHRG Pin Leakage Current
V
CHRG
= 8V, Charging Stops
1
A
Oscillator
f
OSC
Switching Frequency
450
500
550
kHz
DC
Maximum Duty Cycle
100
%
Gate Drive
t
r
Rise Time
C
GATE
= 2000pF, 10% to 90%
20
ns
t
f
Fall Time
C
GATE
= 2000pF, 90% to 10%
50
ns
V
GATE
Output Clamp Voltage
V
CC
V
GATE
8
V
V
GATEHI
Output High Voltage
V
GATEHI
= V
CC
V
GATE
0.3
V
V
GATELO
Output Low Voltage
V
GATELO
= V
CC
V
GATE
4.5
V
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
Supply Current vs Temperature
Supply Current vs V
CC
Oscillator Frequency
vs Temperature
TEMPERATURE (C)
50
I
CC
(mA)
3.5
4.0
25
75
4002
G01
3.0
25
0
50
100
125
2.5
V
CC
(V)
5
I
CC
(mA)
3
25
4002 G02
2
10
15
20
4
CURRENT MODE
TEMPERATURE (C)
50
f
OSC
(kHz)
25
4002 G03
500
25
0
50
450
550
75
100
125
T
A
= 25C, V
CC
= 10V unless otherwise noted.
Note 1: Absolute Maximum Rating are those values beyond which the life
of a device may be impaired.
Note 2: The LTC4002 is tested with Test Circuit 1.
Note 3: The LTC4002 is tested with Test Circuit 2.
Note 4: The LTC4002 is guaranteed to meet performance specifications
from 0C to 70C. Specifications over the 40C to 85C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
LTC4002
5
4002f
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
T
A
= 25C, V
CC
= 10V unless otherwise noted.
Oscillator Frequency vs V
CC
V
CC
(V)
5
f
OSC
(kHz) 500
25
4002 G04
490
10
15
20
510
CHRG Pin Output Low Voltage
vs V
CC
V
CC
(V)
5
V
CHRG
(mV)
140
25
4002 G06
130
10
15
20
150
I
LOAD
= 1mA
Undervoltage Lockout Threshold
vs Temperature
TEMPERATURE (C)
50
V
UV
(V)
25
4002 G05
6
25
0
50
4
8
5
7
75
100
125
V
CC
RISING
LTC4002-8.4
LTC4002-4.2
CHRG Pin Output Low Voltage
vs Temperature
TEMPERATURE (C)
50
V
CHG
(mV)
25
4002 G07
140
25
0
50
100
180
75
100
125
I
LOAD
= 1mA
CHRG Pin Weak Pull-Down
Current vs Temperature
CHRG Output Pin Weak Pull-Down
Current vs V
CC
TEMPERATURE (C)
50
I
CHRG
(
A)
25
4002 G08
25
25
0
50
21
29
75
100
125
V
CHRG
= 8V
V
CC
(V)
5
22
I
CHRG
(
A)
25
28
10
15
20
25
4002 G09
V
CHRG
= 8V
Recharge Voltage Offset
Per Cell from Full Charged
Voltage vs Temperature
Recharge Voltage Offset from Full
Charged Voltage vs V
CC
TEMPERATURE (C)
50
V
RECHRG/CELL
(mV)
25
4002 G10
150
25
0
50
110
190
75
100
125
V
CC
(V)
5
V
RECHRG
(mV)
150
25
4002 G11
140
10
15
20
160
LTC4002-4.2
Recharge Voltage Offset from Full
Charged Voltage vs V
CC
V
CC
(V)
5
V
RECHRG
(mV)
300
25
4002 G12
280
10
15
20
320
LTC4002-8.4
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