LTC3857 Datasheet, PDF (7/38 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

Typical Performance Characteristics
LTC3857
TRACK/SS Pull-Up Current
vs Temperature
1.10
1.05
1.00
0.95
0.90
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3857 G19
SENSE^– Pin Input Current
vs Temperature
50
0
–50
V_OUT < INTV_CC – 0.5V
–100
–150
–200
–250
–300
–350
–400
–450
–500
–550
V_OUT > INTV_CC – 0.5V
–600
–45 –20 5 30 55 80
TEMPERATURE (°C)
105 130
3857 G22
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)
3857 G25
Shutdown (RUN) Threshold
vs Temperature
1.40
1.35
1.30
RUN RISING
1.25
RUN FALLING
1.20
1.15
1.10
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3857 G20
Shutdown Current
vs Input Voltage
30
25
20
15
10
5
0
5 10
15 20 25 30
INPUT VOLTAGE (V)
Oscillator Frequency
vs Input Voltage
356
FREQ = GND
354
35 40
3857 G23
352
350
348
346
344
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3857 G26
Regulated Feedback Voltage
vs Temperature
800
806
804
802
800
798
796
794
792
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3857 G21
Oscillator Frequency
vs Temperature
600
550
FREQ = INTV_CC
500
450
400
FREQ = GND
350
300
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3857 G24
Shutdown Current vs Temperature
20
18
16
14
12
10
8
6
4
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3857 G27
3857fa