LTC3672B-1_15 Datasheet, PDF (5/12 Pages) Linear Technology – Monolithic Fixed-Output 400mA Buck Regulator with Dual

LTC3672B-1
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified.
V_IN1-LDO1 Dropout Voltage
vs Load
600
500
400
25°C
300
–45°C
200
130°C
100
0
0 25 50 75 100 125 150
LDO1 LOAD (mA)
3672b1 G10
LDO1 Short Circuit Current vs V_IN
500 _{VIN1 = 1.8V}
400
300
200
100
–45°C
25°C
90°C
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3672b1 G13
PMOS Switch Maximum Peak
Current
1000
900
800
700
V_IN = 2.9V
V_IN = 3.6V
600
V_IN = 5.5V
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3672b1 G16
V_IN-LDO2 Dropout Voltage
vs Load
300
250
130°C
200
25°C
150
–45°C
100
50
0
0 25 50 75 100 125 150
LDO2 LOAD (mA)
3672b1 G11
LDO2 Short Circuit Current vs V_IN
600
500
400
300
200
100
–45°C
25°C
90°C
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3672b1 G14
LDO1 Short Circuit Current vs V_IN1
500 _{VIN = 5.5V}
450
400
350
300
250
200
150
100
–45°C
50
25°C
90°C
0
0
1
2
3
4
5
6
V_IN1 (V)
3672b1 G12
Buck Oscillator Frequency vs
Temperature
2.6
2.5
2.4
V_IN = 5.5V
V_IN = 4.2V
2.3
2.2
V_IN = 3.6V
2.1
V_IN = 2.9V
2.0
1.9
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3672b1 G15
Buck PMOS Switch On-Resistance
900
130°C
800
90°C
700
25°C
600
500 ^{–45°C}
400
300
200
100
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3672b1 G17
Startup Transient
OUTPUT
VOLTAGES
500mV/DIV
V_OUT1
V_OUT3
V_OUT1
V_OUT2
0V
ENALL
1V
0V
50μs/DIV
3672b1 G18
FRONT PAGE APPLICATION
V_IN = 3.6V
10mA RESISTIVE LOAD ON EACH OUTPUT
3672B1f
5