Datasheet

LTC4008
5
4008fb
TYPICAL PERFORMANCE CHARACTERISTICS
INFET Response Time to
Reverse Current V
FB
vs DCIN
BATMON Offset
(T
A
= 25°C unless otherwise noted)
TEST PERFORMED ON DEMOBOARD
V
IN
= 15VDC
CHARGER = ON
I
CHARGE
= <10mA
V
s
OF PFET (5V/DIV)
I
d
(REVERSE) OF
PFET (5A/DIV)
V
gs
OF PFET (2V/DIV)
4008 G01
V
CHARGE
= 12.6V
INFET = 1/2 Si4925DY
V
gs
= 0
V
s
= 0V
I
d
= 0A
1.25μs/DIV
DCIN (V)
6 11162126
V
FB
(%)
4008 G02
0.05
0
–0.05
–0.10
–0.15
–0.20
BATTERY VOLTAGE (V)
3 8 13 18 23
V
BATTERY
- V
BATMON
(V)
4008 G03
0.02
0
–0.02
–0.04
–0.06
–0.08
–0.10
DCIN = 15V
DCIN = 20V
DCIN = 24V
BATMON LOAD = 100kΩ
V
OUT
vs I
OUT
PWM Frequency vs Duty Cycle
Disconnect/Reconnect Battery
(Load Dump)
OUTPUT CURRENT (A)
0 0.5 1.0 2.0 3.0 4.01.5 2.5 3.5 4.5
OUTPUT VOLTAGE ERROR (%)
4008 G04
DCIN = 20V
V
BAT
= 12.6V
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5.0
DUTY CYCLE (V
OUT
/V
IN
)
0 0.1 0.2 0.4 0.6 0.90.80.3 0.5 0.7 1.0
PWM FREQUENCY (kHz)
4008 G05
PROGRAMMED CURRENT = 10%
DCIN = 15V
DCIN = 20V
DCIN = 24V
350
300
250
200
150
100
50
0
4008 G06
LOAD CURRENT = 1A, 2A, 3A
DCIN = 20V
V
FLOAT
= 12.6V
V
FLOAT
1V/(DIV)
LOAD
STATE
DISCONNECT
RECONNECT
1A STEP
3A STEP
3A STEP
1A STEP