LTC4008_15 Datasheet, PDF (5/24 Pages) Linear Technology – 4A, High Effi ciency, Multi-Chemistry Battery Charger

LTC4008
TYPICAL PERFORMANCE CHARACTERISTICS (T_A = 25°C unless otherwise noted)
INFET Response Time to
Reverse Current
V_gs = 0
V_gs OF PFET (2V/DIV)
V_s OF PFET (5V/DIV)
V_s = 0V
I_d (REVERSE) OF
PFET (5A/DIV)
I_d = 0A
1.25μs/DIV
TEST PERFORMED ON DEMOBOARD
V_IN = 15VDC
CHARGER = ON
V_CHARGE = 12.6V
INFET = 1/2 Si4925DY
I_CHARGE = <10mA
4008 G01
BATMON Offset
0.02
BATMON LOAD = 100kΩ
0
–0.02
–0.04
–0.06
–0.08
–0.10
3
DCIN = 15V
DCIN = 20V
DCIN = 24V
8
13
18
23
BATTERY VOLTAGE (V)
4008 G03
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
V_FB vs DCIN
0.05
0
–0.05
–0.10
–0.15
–0.20
6
11
16
21
26
DCIN (V)
4008 G02
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
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
4008fb
5