MIC2954 Micrel Semiconductor, MIC2954 Datasheet - Page 4

• Manufacturer Part Number: MIC2954
• Description: 250mA Low-Dropout Regulator
• Manufacturer: Micrel Semiconductor

MIC2954
Symbol
e
Error Comparator
Shutdown Input
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Note 8.
Note 9.
Note 10. Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground
MIC2954
n
V
OUT
/ P
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
P
Thermal resistance (
180 C/W with 0.4" leads and 160 C/W with 0.25" leads. Thermal resistance (
(See “Application Information: Thermal Calculation”).
Output voltage temperature coefficient is defined as the worst case voltage change divide by the total temperature range.
Line regulation for the MIC2954 is tested at 125 C for I
0.2%. See “Typical Characteristics” for line regulation versus temperature and load current.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. 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 100 mV below its nominal value measured at 1V
differential. At very low values of programmed output voltage, the minimum input supply voltage of 2 V (2.3V over temperature) must be taken
into account.
pin current.
D
D(max)
Parameter
Thermal Regulation, Note 12
Output Noise Voltage
(10Hz to 100kHz)
Reference Voltage
Reference Voltage
Feedback Pin Bias Current
Reference Voltage
Temperature Coefficient, Note 12
Feedback Pin Bias Current
Temperature Coefficient
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
Input Logic Voltage
Shutdown Pin Input Current
Regular Output Current in
Shutdown
= (T
J(max)
– T
A
JC
)
) of the TO-220 package is 2.5 C/W, and 15 C/W for the SOT-223. Thermal resistance (
JC
. Exceeding T
J(max)
will cause thermal shutdown.
Conditions
I
I
MIC2954-02/-07 ( 0.5%)
MIC2954-03/-08 ( 1%)
MIC2954-02/-07 ( 0.5%), Note 13
MIC2954-03/-08 ( 1%), Note 13
MIC2954-02/-07 ( 0.5%)
MIC2954-03/-08 ( 1%)
V
V
Note 14
Note 14
Note 14
low (on)
high (off)
V
V
Note 15
L
L
OH
IN
SHDN
SHDN
= 100mA, C
= 100mA, C
L
= 4.5V, I
= 30V
= 1mA. For I
= 2.4V
= 30V
4
OL
L
L
= 2.2 F
= 33 F
= 400 A
L
= 100 A and T
JA
) of the SOP-8 is 160 C/W mounted on a printed circuit board
J
= 125 C, line regulation is guaranteed by design to
1.220
1.200
1.210
1.200
1.190
1.185
Min
2.0
JC
1.235
1.235
0.05
0.01
Typ
400
260
150
450
) of the TO-92 package is
0.1
1.3
20
20
50
60
75
15
30
3
1.250
1.260
1.260
1.270
1.270
1.285
Max
1.00
2.00
250
400
140
100
600
750
0.2
0.7
August 1999
40
60
40
40
25
95
50
10
20
ppm/ C
ppm/ C
Micrel
V(rms)
V(rms)
nA/ C
Units
%/W
mV
mV
mV
mV
mV
mV
mV
nA
nA
V
V
V
V
V
V
V
V
A
A
A
A
A
A
A
A