LTC3728 Datasheet, PDF (7/32 Pages) Linear Technology – Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator

TYPICAL PERFOR A CE CHARACTERISTICS
LTC3728
Input Source/Capacitor
Instantaneous Current (Figure 13)
Burst Mode Operation (Figure 13)
Constant Frequency (Burst Inhibit)
Operation (Figure 13)
I_IN
2A/DIV
V_IN
200mV/DIV
V_SW1
10V/DIV
V_SW2
10V/DIV
V_OUT
20mV/DIV
I_L
0.5A/DIV
V_OUT
20mV/DIV
I_L
0.5A/DIV
V_IN = 15V
1µs/DIV
V_OUT = 5V
V_PLLFLTR = 0V
I_OUT5 = I_OUT3.3 = 2A
3728 G22
V_IN = 15V
V_OUT = 5V
V_PLLFLTR = 0V
V_FCB = OPEN
I_OUT = 20mA
10µs/DIV
3728 G23
V_IN = 15V
V_OUT = 5V
V_PLLFLTR = 0V
V_FCB = 5V
I_OUT = 20mA
2µs/DIV
3728 G24
Current Sense Pin Input Current
vs Temperature
35
V_OUT = 5V
33
31
EXTV_CC Switch Resistance
vs Temperature
10
8
6
Oscillator Frequency
vs Temperature
700
600
V_PLLFLTR = 5V
500
400
V_PLLFLTR = 1.2V
29
4
300
V_PLLFLTR = 0V
200
27
2
100
25
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G26
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G27
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G28
Undervoltage Lockout
vs Temperature
3.50
3.45
3.40
3.35
3.30
3.25
3.20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G29
Shutdown Latch Thresholds
vs Temperature
4.5
4.0
LATCH ARMING
3.5
3.0
LATCHOFF
THRESHOLD
2.5
2.0
1.5
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G30
3728fb
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