Datasheet

LTC3577/LTC3577-1
14
3577fa
TYPICAL PERFORMANCE CHARACTERISTICS
OVSENS Quiescent Current
vs Temperature
OVGATE vs OVSENS
Input and Battery Current
vs Load Current
T
A
= 25°C unless otherwise specifi ed
Rising Overvoltage Threshold
vs Temperature
LED Driver Effi ciency 10 LEDs LED Driver Effi ciency 8 LEDs
TEMPERATURE (°C)
–40
QUIESCENT CURRENT (µA)
33
35
37
60
3577 G34
31
29
27
–15
10
35
85
V
OVSENS
= 5V
TEMPERATURE (°C)
–40
OPV THRESHOLD (V)
6.270
6.275
6.280
60
3577 G35
6.265
6.260
6.255
–15
10
35
85
INPUT VOLTAGE (V)
0
0
OVGATE (V)
2
4
6
8
10
12
24 68
3577 G36
OVSENS CONNECTED
TO INPUT THROUGH
6.2k RESISTOR
I
LOAD
(mA)
0
600
500
400
300
200
100
0
–100
300 500
3577 G37
100 200
400 600
CURRENT (mA)
I
LOAD
I
IN
I
BAT
(CHARGING)
I
BAT
(DISCHARGING)
WALL = 0V
R
PROG
= 2k
R
CLPROG
= 2k
I
LED
(mA)
0
EFFICIENCY (%)
90
85
80
75
70
65
60
55
50
16
3577 G38
4 8 12 20142 6 10 18
3V
3.6V
4.2V
4.8V
5.5V
I
LED
(mA)
0
EFFICIENCY (%)
90
85
80
75
70
65
60
55
50
16
35773 G39
4 8 12 20142 6 10 18
3V
3.6V
4.2V
4.8V
5.5V
OVP Connection Waveform OVP Reconnection WaveformOVP Protection Waveform
V
BUS
5V/DIV
OVGATE
5V/DIV
500µs/DIV
3577 G31
OVP
INPUT
VOLTAGE
0V TO 5V
STEP 5V/DIV
V
BUS
5V/DIV
OVGATE
5V/DIV
500µs/DIV
3577 G32
OVP
INPUT
VOLTAGE
5V TO 10V
STEP 5V/DIV
V
BUS
5V/DIV
OVGATE
5V/DIV
500µs/DIV
3577 G33
OVP
INPUT
VOLTAGE
10V TO 5V
STEP 5V/DIV