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LTC4002ES8-4.2#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
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 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
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 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.
6.8µH
22µF
+
4002 TA01
NTC: DALE NTHS-1206N02
10µF
0.1µF
0.47µF
2.2k
68mΩ
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
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
T
JMAX
= 125°C, θ
JA
= 110°C/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) .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (S8 Package)
(Soldering, 10 sec) ........................................... 300°C
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
= 25°C. V
CC
= 10V unless otherwise noted.
T
JMAX
= 125°C, θ
JA
= 43°C/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 µA
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) 0°C ≤ T
A
≤ 85°C ● 93 100 107 mV
–40°C ≤ T
A
≤ 85°C ● 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 µA
I
CHRG
CHRG Pin Weak Pull-Down Current V
CHRG
= 1V 15 25 35 µA
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
= 25°C. 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 µA
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 µA
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 ● 8V
∆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
= 25°C. 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 µA
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 µA
I
CHRG
CHRG Pin Weak Pull-Down Current V
CHRG
= 1V 15 25 35 µA
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)
51015 %
t
TIMER
Charge Time Accuracy 10 %
I
NTC
NTC Pin Output Current V
NTC
= 0.85V ● 75 85 95 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC4002ES8-4.2#PBF

Mfr. #:
Buy LTC4002ES8-4.2#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management St&alone Li-Ion Switch Mode Bat Chr
Lifecycle:
New from this manufacturer.
Delivery:
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