MIC5237 Micrel Semiconductor, MIC5237 Datasheet - Page 3

• Manufacturer Part Number: MIC5237
• Description: 500mA Low-Dropout Regulator Preliminary Information
• Manufacturer: Micrel Semiconductor

Electrical Characteristics
V
Symbol
V
V
I
PSRR
I
e
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
January 2000
MIC5237
GND
LIMIT
no
V
V
V
V
IN
OUT
IN
OUT
OUT
OUT
OUT
= V
– V
/ T
/V
/V
/ P
OUT
OUT
OUT
OUT
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when
operating the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction
temperature, T
dissipation at any ambient temperature is calculated using: P
tion will result in excessive die temperature, and the regulator will go into thermal shutdown. See the “Thermal Considerations” section for
details.
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load
range from 100 A to 500mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential.
Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of
the load current plus the ground pin current.
Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 500mA load pulse at V
D
+ 1.0V; C
Parameter
Output Voltage Accuracy
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation
Dropout Voltage, Note 4
Ground Pin Current, Note 5
Ripple Rejection
Current Limit
Thermal Regulation
Output Noise
OUT
J(max)
= 4.7 F, I
, the junction-to-ambient thermal resistance,
OUT
= 100 A; T
J
= 25 C, bold values indicate –40 C
Conditions
variation from nominal V
Note 2
V
I
I
I
I
I
I
I
I
I
f = 120Hz
V
Note 6
V
C
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
OUT
OUT
OUT
= V
= 100 A to 500mA, Note 3
= 50mA
= 150mA
= 500mA
= 150mA
= 500mA
= 100 A
= 100 A
= 50mA
= 0V
= 5.0V, I
= 2.2 F
OUT
D(max)
+ 1V to 16V
IN
3
JA
OUT
= 16V for t = 10ms.
= (T
, and the ambient temperature, T
J(max)
= 50mA,
– T
OUT
A
)
JA
. Exceeding the maximum allowable power dissipa-
T
J
+125 C; unless noted.
A
. The maximum allowable power
Min
–3
–5
Typical
0.015
0.05
0.05
115
165
300
350
700
500
1.8
40
10
80
75
8
1000
Max
0.05
190
280
350
450
600
700
130
170
650
900
900
0.1
0.5
0.7
2.5
3.0
70
90
15
20
3
5
MIC5237
ppm/ C
nV/ Hz
Micrel
Units
%/W
%/V
%/V
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
mA
dB
%
%
%
%
A
A
A
A