LTC4002_15 Datasheet, PDF (4/16 Pages) Linear Technology – Standalone Li-Ion Switch Mode Battery Charger

LTC4002
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
Hysteresis
● 340
355
370
mV
25
mV
V_NTC-COLD NTC Pin Threshold Voltage (Cold)
V_NTC Rising
Hysteresis
● 2.428 2.465 2.502
V
170
mV
∆V_RECHRG Recharge Battery Voltage Offset from Full
Charged Battery Voltage
V_{BAT(FULLCHARGED)} – V_RECHRG, V_BAT Falling
200 300 400
mV
I_LEAK
CHRG Pin Leakage Current
Oscillator
V_CHRG = 8V, Charging Stops
1
µA
f_OSC
Switching Frequency
DC
Maximum Duty Cycle
450 500 550
kHz
100
%
Gate Drive
t_r
t_f
∆V_GATE
∆V_GATEHI
∆V_GATELO
Rise Time
Fall Time
Output Clamp Voltage
Output High Voltage
Output Low Voltage
C_GATE = 2000pF, 10% to 90%
C_GATE = 2000pF, 90% to 10%
V_CC – V_GATE
∆V_GATEHI = V_CC – V_GATE
∆V_GATELO = V_CC – V_GATE
20
ns
50
ns
●
8
V
●
0.3
V
● 4.5
V
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.
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C, V_CC = 10V unless otherwise noted.
Supply Current vs Temperature
4.0
Supply Current vs V_CC
4
CURRENT MODE
Oscillator Frequency
vs Temperature
550
3.5
3
500
3.0
2.5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
4002 G01
2
5
10
15
20
25
V_CC (V)
4002 G02
450
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
4002 G03
4002f
4