ltc3612 Linear Technology Corporation, ltc3612 Datasheet - Page 6

• Manufacturer Part Number: ltc3612
• Description: 3a, 4mhz Monolithic Synchronous Step-down Dc/dc Converter
• Manufacturer: Linear Technology Corporation

LTC3612
6
TYPICAL PERFORMANCE CHARACTERISTICS
200mV/DIV
500mA/DIV
500mV/DIV
200mV/DIV
V
V
20mV/DIV
TRACK/SS
TRACK/SS
PGOOD
1A/DIV
2V/DIV
2V/DIV
V
V
OUT
OUT
SW
I
I
L
L
Load Step Transient in Forced
Continuous Mode without AVP Mode
Tracking Up/Down in Forced
Continuous Mode, DDR Pin Tied
to SV
V
I
V
COMPENSATION FIGURE 1
Sinking Current
V
I
V
V
I
V
V
V
LOAD
OUT
OUT
OUT
MODE
OUT
MODE
OUT
TRACK/SS
MODE
DDR
= 3V
= –1A
= 0V TO 1.2V
= 1.8V
= 1.2V
= 3.3V
= 100mA TO 3A
IN
= 1.5V
= 1.5V
= 1.5V
= 0V TO 0.4V
50μs/DIV
2ms/DIV
1μs/DIV
3612 G19
3612 G13
3612 G16
500mV/DIV
100mV/DIV
PGOOD
1V/DIV
1A/DIV
2V/DIV
0.602
0.600
0.598
0.594
0.606
0.604
0.596
V
1A/DIV
RUN
OUT
V
I
OUT
L
–50
I
Internal Start-Up in Forced
Continuous Mode
Reference Voltage
vs Temperature
L
V
I
V
OUT
OUT
MODE
Load Step Transient in Forced
Continuous Mode with AVP Mode
V
I
V
V
OUTPUT CAPACITOR VALUE FIGURE 1
LOAD
–30
OUT
MODE
ITH
= 3A
= 1.8V
= V
= 1.5V
= 1.8V
= 100mA TO 3A
–10
= 1.5V
IN
TEMPERATURE (°C)
10
500μs/DIV
30
50μs/DIV
50
70
90 110
V
3612 G17
3612 G20
IN
3612 G14
130
= 3.3V, RT/SYNC = SV
200mV/DIV
500mV/DIV
2A/DIV 0A
V
TRACK/SS
PGOOD
0.10
0.09
0.08
0.07
0.04
0.03
0.02
0.01
0.06
0.05
1V/DIV
2V/DIV
I
V
V
L
0
OUT
OUT
Switch On-Resistance
vs Input Voltage
2.5
Load Step Transient in Forced
Continuous Mode Sourcing and
Sinking Current
Tracking Up/Down in
Forced Continuous Mode,
DDR Pin Tied to 0V
V
I
V
COMPENSATION FIGURE 1
V
I
V
V
V
LOAD
OUT
OUT
TRACK/SS
MODE
DDR
OUT
MODE
= 3A
= 1.8V
= 0V TO 1.8V
= 0V
= –1.5A TO 3A
3.0
= 1.5V
= 1.5V
IN
SYNCHRONOUS SWITCH
= 0V TO 0.7V
INPUT VOLTAGE (V)
unless otherwise noted.
3.5
MAIN SWITCH
50μs/DIV
2ms/DIV
4.0
4.5
5.0
3612 G21
3612 G18
3612 G15
3612f
5.5