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
= 25°C. 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 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
● 8V
∆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
UW
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
= 25°C, 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 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
