MIC2950 Datasheet, PDF (8/14 Pages) Micrel Semiconductor – 150mA Low-Dropout Voltage Regulator

MIC2950/2951
Micrel
MIC2951
Minimum Operating Voltage
2.2
2.1
2.0
1.9
1.8
1.7
1.6
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (°C)
MIC2951
Error Comparator Output
8
V_OUT = 5V
6
4
HYSTERESIS
2
0
PULLUP RESISTOR TO
-2
SEPARATE 5V SUPPLY
012345 6
INPUT VOLTAGE (V)
Load Transient Response
125
100
75
50
25
0
-25
-50
C_L= 4.7 µF
100
V_OUT = 5V
mA
100
µA
0 2 4 6 8 10
TIME (mS)
Output Impedance
10
5 ^{I0 = 100 µA}
2 I₀ = 1 mA
1
0.5
0.2
0.1
0.05
I₀ = 100 mA
V_OUT = 5V
C_L= 4.7 µF
0.02
0.01
10 100
1K 10K 100K 1M
FREQUENCY (Hz)
MIC2951
Feedback Bias Current
20
10
0
-10
-20
-30
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (°C)
MIC2951
Comparator Sink Current
2.5
T_A = 125°C
2.0
1.5
T_A = 25°C
1.0
T_A = -55°C
0.5
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
OUTPUT LOW VOLTAGE (V)
Load Transient Response
80
60
40
20
0
-20
-40
C_L= 15 µF
-60
V_OUT = 5V
100
mA
100
µA
0 4 8 12 16 20
TIME (mS)
Ripple Rejection
90
80
70
I_L = 0
60
50
40 C_L = 1.5 µF
30
V_IN = 6V
V_OUT = 5V
I_L = 100 µA
20
10¹ 10² 10³ 10⁴ 10 10⁶
FREQUENCY (Hz)
MIC2951
Feedback Pin Current
50
PIN 7 DRIVEN BY EXTERNAL
0
SOURCE (REGULATOR RUN
OPEN LOOP)
-50
T_A = 125°C
-100
-150
-200
T_A = 25°C
-250
T_A = –55°C
-2.0 -1.5 -1.0 -0.5 0
0.5 1.0
FEEDBACK VOLTAGE (V)
400 ^{Line Transient Response}
mV
200
mV
0
-50
mV
C_L= 4.7µF
I_L = 1 mA
8V
V_OUT = 5V
6V
4V
0 200 400 600 800
TIME (µS)
MIC2951
Enable Transient
7
6
C_L = 1.5 µF
5
4
3
2
I_L = 10 mA
1
0
V_IN = 8V
C_L = 10 µF V_OUT = 5V
2
0
-2
-100 0 100 200 300 400 500 600 700
TIME (µS)
Ripple Rejection
90
80
70 _{IL = 1 mA}
60
C_L = 1.5 µF
V_IN = 6V
V_OUT = 5V
50
40
30
20
10¹
I_L = 10 mA
10² 10³ 10⁴ 10⁵ 10⁶
FREQUENCY (Hz)
3-56
February 1999