Datasheet

LTC4100
6
4100fc
For more information www.linear.com/LTC4100
Typical perForMance characTerisTics
Disconnect/Reconnect Battery
(Load Dump)
Battery Leakage Current
vs Battery Voltage Efficiency at 19V V
DCIN
Efficiency at 12.6V with 15V V
DCIN
SMBus Accelerator Operation Low Current Operation
INFET Response Time to
Reverse Current V
OUT
vs I
OUT
PWM Frequency vs Duty Cycle
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)
4100 G01
V
CHARGE
= 12.6V
INFET = 1/2 Si4925DY
V
gs
= 0
V
s
= 0V
I
d
= 0A
1.25µs/DIV
OUTPUT CURRENT (A)
0 0.5 1.0 2.0 3.0 4.01.5 2.5 3.5 4.5
OUTPUT VOLTAGE ERROR (%)
4100 G02
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)
4100 G03
PROGRAMMED CURRENT = 10%
DCIN = 15V
DCIN = 20V
DCIN = 24V
350
300
250
200
150
100
50
0
4100 G04
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
BATTERY VOLTAGE (V)
0 5 10 15 20 25 30
BATTERY LEAKAGE CURRENT (µA)
4100 G05
40
35
30
25
20
15
10
5
0
VDCIN = 0V
CHARGING CURRENT (A)
1.000.50 1.50 2.00 2.50 3.00
EFFICIENCY (%)
4100 G06
16.8V
12.6V
100
95
90
85
80
75
CHARGING CURRENT (A)
1.000.50 1.50 2.00 2.50 3.00
EFFICIENCY (%)
4100 G07
100
95
90
85
80
75
1µs/DIV
4100 G08
5V
0V
R
PULLUP
= 15k
LTC4100
V
DD
= 5V
C
BUS
= 200pF
T
A
= 25°C
PROGRAMMED CURRENT (A)
0
MEASURED CURRENT (A)
0.5
0.3
0.4
0.2
0.1
0
–0.1
0.1
4100 G09
0.2
0.40.3
V
DD
= 5V
TEMP = 27°C
DCIN = 15V
LOW
CURRENT
MODE
PROGRAMMED
CURRENT
NO LOW
CURRENT
MODE