Datasheet

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