Datasheet

LTC3788-1
7
37881fc
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current vs Temperature
INTV
CC
vs INTV
CC
Load Current
INTV
CC
Line Regulation
Shutdown (RUN) Threshold
vs Temperature
Undervoltage Lockout Threshold
vs Temperature
EXTV
CC
Switchover and INTV
CC
Voltages vs Temperature
TEMPERATURE (°C)
–45
QUIESCENT CURRENT (µA)
30
37881 G13
140
120
–20 5 55
110
100
170
160
150
130
80 105 130
V
IN
= 12V
V
FB
= 1.25V
RUN2 = GND
TEMPERATURE (°C)
–45
RUN PIN VOLTAGE (V)
30
37881 G14
1.25
1.15
–20 5 55
1.10
1.40
1.35
1.30
1.20
80 105 130
RUN FALLING
RUN RISING
–45 30
–20 5 55 80 105 130
TEMPERATURE (°C)
INTV
CC
VOLTAGE (V)
3.6
4.1
4.2
4.3
4.4
3.9
3.5
4.0
3.4
3.8
3.7
37881 G15
INTV
CC
RISING
INTV
CC
FALLING
015
510 2025 30 35 40
INPUT VOLTAGE (V)
INTV
CC
VOLTAGE (V)
4.7
5.2
5.3
5.4
5.5
5.0
4.6
5.1
4.5
4.9
4.8
37881 G16
TEMPERATURE (°C)
–45
4.0
EXTV
CC
AND INTV
CC
VOLTAGE (V)
4.2
4.6
4.8
5.0
6.0
5.4
5
55
80
4.4
5.6
5.8
5.2
–20
30
105
130
37881 G17
EXTV
CC
RISING
EXTV
CC
FALLING
INTV
CC
INTV
CC
LOAD CURRENT (mA)
0
INTV
CC
VOLTAGE (V)
5.35
5.40
5.45
140
5.30
5.25
40 80
20 180
60 100
160
120 200
5.20
5.00
5.10
5.05
5.15
5.50
37881 G18
EXTV
CC
= 0V
EXTV
CC
= 6V
V
IN
= 12V
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–45
300
FREQUENCY (kHz)
350
600
450
5
55
80
500
550
400
–20
30
105
130
37881 G19
FREQ = GND
FREQ = INTV
CC
Maximum Current Sense
Threshold vs I
TH
Voltage
Oscillator Frequency
vs Input Voltage
15
510 20
25 30 35 40
INPUT VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
344
354
356
358
360
350
342
352
340
348
346
37881 G20
FREQ = GND
I
TH
VOLTAGE (V)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
80
120
100
0.6 1.0
37881 G21
40
0
0.2 0.4
0.8 1.2 1.4
–40
60
20
–20
–60
PULSE-SKIPPING MODE
FORCED CONTINUOUS MODE
Burst Mode OPERATION