LTC4008 Datasheet, PDF (5/24 Pages) Linear Technology – 4A, High Efficiency, Multi-Chemistry Battery Charger

LTC4008
TYPICAL PERFOR A CE CHARACTERISTICS (T_A = 25°C unless otherwise noted)
V_OUT vs I_OUT
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5 ^{DCIN = 20V}
V_BAT = 12.6V
–5.0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
OUTPUT CURRENT (A)
4008 G04
PWM Frequency vs Duty Cycle
350
300
250
200
150
PROGRAMMED CURRENT = 10%
100
50
DCIN = 15V
DCIN = 20V
0
DCIN = 24V
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
DUTY CYCLE (V_OUT/V_IN)
4008 G05
Disconnect/Reconnect Battery
(Load Dump)
V_FLOAT
1V/(DIV)
3A STEP
1A STEP
1A STEP
LOAD
STATE
DISCONNECT
3A STEP
RECONNECT
LOAD CURRENT = 1A, 2A, 3A
DCIN = 20V
V_FLOAT = 12.6V
4008 G06
Battery Leakage Current vs
Battery Voltage
40
VDCIN = 0V
35
30
25
20
15
Efficiency at 19VDC V_IN
100
16.8V
95
12.6V
90
85
10
80
5
0
0
5 10 15 20 25 30
BATTERY VOLTAGE (V)
4008 G07
75
0.50
1.00 1.50 2.00 2.50 3.00
CHARGE CURRENT (A)
4008 G09
Efficiency at 12.6V with 15VDC V_IN
100
95
90
85
80
75
0.50
1.00 1.50 2.00 2.50 3.00
CHARGE CURRENT (A)
4008 G10
Charging Voltage Error
TEMP = 27°C, I_LOAD = 0.120A
0.150
0.125
0.100
0.075
0.050
DCIN = 20V
0.025
DCIN = 15V
0
–0.025
–0.050
–0.075
–0.100
–0.125
–0.150
0 2 4 6 8 10 12 14 16 18 20 22
CHARGING VOLTAGE (V)
4008 G11
4008fa
5