LTC3622_15 Datasheet, PDF (6/24 Pages) Linear Technology – 17V, Dual 1A Synchronous Step-Down Regulator with Ultralow Quiescent Current

LTC3622/
LTC3622-2/LTC3622-23/5
Typical Performance Characteristics V_IN1 = V_IN2 = 12V, T_A = 25°C, unless otherwise noted.
Load Step
V_OUT
AC-COUPLED
200mV/DIV
I_L
500mA/DIV
40µs/DIV
V_IN = 12V
V_OUT = 3.3V
BURST MODE OPERATION
LOAD STEP FROM 100mA TO 1A
Start-Up Operation
RUN
5V/DIV
I_L
200mA/DIV
3622 G10
V_OUT
1V/DIV
PGOOD
2V/DIV
50µs/DIV
3622 G11
Oscillator Frequency
vs Temperature
1500
1400
1300
1200
1100
1000
900
800
700
600 ^VIN ^{= 12V}
f_SW = 1MHz
500
–100 –50 0
50 100
TEMPERATURE (°C)
150 200
3622 G12
Oscillator Frequency
vs Supply Voltage
2.50
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
0 2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
3622 G13
Reference Voltage
vs Temperature
600.5
600.0
599.5
599.0
598.5
598.0
597.5
597.0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
3622 G14
R_DS(ON) vs Input Voltage
600
PMOS CH1 R_DS(ON)
PMOS CH2 R_DS(ON)
500
NMOS CH1 R_DS(ON)
NMOS CH2 R_DS(ON)
400
300
200
100
0 2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
3622 G15
R_DS(ON) vs Temperature
700
PMOS CHANNEL 1
PMOS CHANNEL 2
600
NMOS CHANNEL 1
NMOS CHANNEL 2
500
400
300
200
100
–50 –25
0 25 50 75 100 125 150
INPUT VOLTAGE (V)
3622 G16
6
Load Regulation
5
4
3
PULSE SKIP
BURST MODE
2
1
0
–1
–2
–3
V_IN = 12V
V_OUT = 3.3V
–4 ^{PULSE SKIPPING OPERATION}
f_SW = 1MHz
–5
0 0.2 0.4 0.6 0.8
LOAD CURRENT (A)
1.0 1.2
3622 G17
For more information www.linear.com/LTC3622
Line Regulation
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
V_OUT = 2.5V
I_LOAD = 500mA
–0.4 fSW = 1MHz
PULSE-SKIPPING OPERATION
–0.5
0
3
6
9 12
INPUT VOLTAGE (V)
15 18
3622 G18
3622fa