LTC3868-1 Datasheet, PDF (7/38 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller

Typical Performance Characteristics
LTC3868-1
Soft-Start Pull-Up Current
vs Temperature
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
38681 G19
SENSE^– Pin Input Current
vs Temperature
50
0
–50
V_OUT = 3.3V
–100
–150
–200
–250
–300
–350
–400
–450
–500
–550
V_OUT = 28V
–600
–45 –20 5 30 55 80
TEMPERATURE (°C)
105 130
38681 G22
Shutdown (RUN) Threshold
vs Temperature
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
–45 –20
5 30 55 80 105 130
TEMPERATURE (°C)
38681 G20
Shutdown Current
vs Input Voltage
14
12
10
8
6
4
2
0
5
10
15
20
25 28
INPUT VOLTAGE (V)
38681 G23
Regulated Feedback Voltage
vs Temperature
808
806
804
802
800
798
796
794
792
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
38681 G21
Oscillator Frequency
vs Temperature
800
700
600
FREQ = INTV_CC
500
400
FREQ = GND
300
200
100
0
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
38681 G24
Oscillator Frequency
vs Input Voltage
356
354
352
350
348
346
344
5
10
15
20
INPUT VOLTAGE (V)
25 28
38681 G28
Undervoltage Lockout Threshold
vs Temperature
4.4
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
–45 –20
5 30 55 80 105 130
TEMPERATURE (°C)
38681 G25
38681fb