Micrel Inc.
MIC4555
September 2011
7
M9999-092311-B
Typical Characteristics (Continued)
Current Limit VCC
vs. Temperature
0
20
40
60
80
100
120
140
160
180
200
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
CURRE
NT
L
IM
IT
(
m
A)
VBAT = DVCC = 5V
VSEL = 0V
VCC_NOM = 1.8V
LDO Dropout
vs. Temperature
0
10
20
30
40
50
60
70
80
90
100
-40 -20
0
20
40
60
80 100 120
TEMPERATURE (°C)
D
R
O
P
O
U
T
V
O
LTA
G
E
(
m
V
)
VCC = 3.0V
COUT = 1F
IOUT = 50mA
LDO Dropout
vs. Output Current
0
10
20
30
40
50
60
70
0
5
10
15
20
25
30
35
40
45
50
OUTPUT CURRENT (mA)
D
R
OP
OU
T
V
O
L
T
A
GE
(m
V
)
COUT = 1F
VCC = 3V
LDO PSRR
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
100
1000
10000
100000 1000000
FREQUENCY (Hz)
PS
RR
(
d
B)
VBAT = DVCC = 4.3V
COUT = 1F
Load = 35
VCC = 1.8V
VCC = 3V
LDO Output Noise
Spectral Density
0.001
0.01
0.1
1
10
100
1,000
10,000
100,000
FREQUENCY (Hz)
N
O
ISE
(
V/
√
Hz
)
VBAT = DVCC = 4.3V
Load = 36
COUT = 1F
Noise (10Hz- 100kHz) = 55.2Vrms