Datasheet

LTC4009
LTC4009-1/LTC4009-2
6
4009fd
Typical perForMance characTerisTics
PWM Frequency vs Duty Cycle
Gate Drive Non-Overlap
Charge Current Line Regulation
Input Current Limit
Battery Load Dump
BATTERY VOLTAGE
(500mV/DIV)
LOAD
STATE
TIME (1ms/DIV)CLP = 20V
V
OUT
= 12.3V
4009 G06
DISCONNECT
RECONNECT
3A
2A
12.1V
1A
1A
DCIN (V)
5
–0.5
CHARGE CURRENT ERROR (%)
–0.4
–0.2
–0.1
0
0.5
0.2
10
15
4009 G07
–0.3
0.3
0.4
0.1
20
25
I
CHG
= 1A
I
CHG
= 2A
I
CHG
= 3A
BAT = 6V
R
SENSE
= 33mΩ
R
IN
= 3.01k
Charge Current Load Regulation
BAT (V)
11.0
CHARGE CURRENT (A)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–0.5
12.6
4009 G08
11.4 11.8 12.2 13.0
I
CHG
= 3A
I
CHG
= 2A
I
CHG
= 1A
DCIN = 20V
R
SENSE
= 33mΩ
R
IN
= 3.01k
SYSTEM LOAD (A)
0
CURRENT (A)
0.5
1.0
1.5
1.5
2.5
4009 G09
0
–0.5
–1.0
0.5 1.0 2.0
2.0
2.5
3.0
I
IN
I
CHG
ICL STATE
2.5A BULK CHARGE
2.1A INPUT CURRENT LIMIT
PWM Soft-Start
I
CHG
2A/DIV
TIME (500µs/DIV)
4009 G10
ITH
1V/DIV
PROG
1V/DIV
SHDN
5V/DIV
TIME (80ns/DIV)
EXTERNAL FET DRIVE (1V/DIV)
4009 G11
TGATE
BGATE
DUTY CYCLE (%)
0
0
PWM FREQUENCY (kHz)
100
200
300
400
500
600
20 40 60 80
4009 G12
100
CLP = 6V
CLP = 12V
CLP = 20V
CLP = 25V
I
CHG
= 750mA
(T
A
= 25°C unless otherwise noted. D
IN
= SSB44, L = IHLP-2525 6.8µH)
Charge Current Accuracy
BAT (V)
0
5
4
3
2
1
0
–1
–2
12 20
4009 G15
4 8 162 14 226 10 18 24
CHARGE CURRENT ERROR (%)
DCIN = 24V
R
PROG
= 35.7k
R
SENSE
= 33mΩ
R
IN
= 3.01k
DCIN = 12V
R
PROG
= 26.7k