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PDF MIC2950-06BZ Data sheet ( Hoja de datos )
| Número de pieza | MIC2950-06BZ | |
| Descripción | 150mA Low-Dropout Voltage Regulator | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC2950/2951
Micrel
MIC2950/2951
150mA Low-Dropout Voltage Regulator
General Description
The MIC2950 and MIC2951 are “bulletproof” micropower
voltage regulators with very low dropout voltage (typically
40mV at light loads and 250mV at 100mA), and very low
quiescent current. Like their predecessors, the LP2950 and
LP2951, the quiescent current of the MIC2950/MIC2951
increases only slightly in dropout, thus prolonging battery life.
The MIC2950/MIC2951 are pin for pin compatible with the
LP2950/LP2951, but offer lower dropout, lower quiescent
current, reverse battery, and automotive load dump protection.
The key additional features and protection offered include
higher output current (150mA), positive transient protection
for up to 60V (load dump), and the ability to survive an
unregulated input voltage transient of –20V below ground
(reverse battery).
The plastic DIP and SOIC versions offer additional system
functions such as programmable output voltage and logic
controlled shutdown. The 3-pin TO-92 MIC2950 is pin-
compatible with the older 5V regulators.
These system functions also include an error flag output that
warns of a low output voltage, which is often due to failing
batteries on the input. This may also be used as a power-on
reset. A logic-compatible shutdown input is also available
which enables the regulator to be switched on and off. This
part may also be pin-strapped for a 5 V output, or programmed
from 1.24 V to 29 V with the use of two external resistors.
Features
• High accuracy 3.3, 4.85, or 5V, guaranteed 150mA output
• Extremely low quiescent current
• Low-dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Use as regulator or reference
• Needs only 1.5µF for stability
• Current and thermal limiting
• Unregulated DC input can withstand –20V reverse battery
and +60V positive transients
• Error flag warns of output dropout (MIC2951)
• Logic-controlled electronic shutdown (MIC2951)
• Output programmable from 1.24V to 29V (MIC2951)
Applications
• Automotive Electronics
• Battery Powered Equipment
• Cellular Telephones
• SMPS Post-Regulator
• Voltage Reference
• Avionics
• High Efficiency Linear Power Supplies
Block Diagram
3
Unregulated
DC Supply FB
SHDN
TTL/CMOS
Control Logic
Input
60mV
1.23V
REF.
MIC2951-0x
IN
Error
Amp.
182k
60k
Error Detection
Comparator
OUT
SNS
TAP
ERR
GND
5V/150mA
Output
330k
TTL/CMOS
Compatible
Error Output
1.5µF
February 1999
3-49
1 page  
MIC2950/2951
Parameter
Current Limit
Thermal Regulation
Output Noise
Reference Voltage
Reference Voltage
Feedback Bias Current
Reference Voltage
Temperature Coefficient
Feedback Bias Current
Temperature Coefficient
Error Comparator (Flag)
Output Leakage Current
Error Comparator (Flag)
Output Low Voltage
Error Comparator
Upper Threshold Voltage
Error Comparator
Lower Threshold Voltage
Error Comparator Hysteresis
Condition
VOUT = 0V
Note 13
10Hz to 100kHz, CL = 1.5µF
10Hz to 100kHz, CL = 200µF
10Hz to 100kHz, CL = 3.3µF,
0.01µF bypass Feedback to Output
MIC295x-02/-05 (±0.5%)
MIC295x-03/-06 (±1%)
MIC2951-3.3 (±1%)
MIC2951-4.8 (±1%)
MIC295x-02/-05 (±0.5%), Note 14
MIC295x-03/-06 (±1%), Note 14
MIC2951-3.3 (±1%), Note 14
MIC2951-4.8 (±1%), Note 14
MIC295x-02/-05 (±0.5%), Note 9
MIC295x-03/-06 (±1%), Note 9
MIC2951-3.3 (±1%), Note 9
MIC2951-4.8 (±1%), Note 9
VOH = 30V
VIN = 4.5V, IOL = 200µA
Note 15
Note 15
Note 15
Micrel
Min Typ Max Units
300 400 mA
450 mA
0.05 0.20 %/W
430 µVRMS
160 µVRMS
100 µVRMS
1.220
1.200
1.210
1.200
1.210
1.200
1.210
1.200
1.190
1.185
1.185
1.185
1.235
1.235
1.235
1.235
20
20
50
50
50
0.1
1.250
1.260
V
V
1.260
1.270
V
V
1.260
1.270
V
V
1.260
1.270
V
V
1.270 V
1.285 V
1.285 V
1.285 V
40 nA
60 nA
ppm/°C
ppm/°C
ppm/°C
ppm/°C
nA/°C
0.01 1.00
2.00
µA
µA
150 250 mV
400 mV
40 60
25
mV
mV
75 95 mV
140 mV
15 mV
3
February 1999
3-53
5 Page 
MIC2950/2951
Noise can be reduced fourfold by a bypass capacitor across
R , since it reduces the high frequency gain from 4 to unity.
1
Pick:
CBYPASS ≅
1
2 πR1 • 200 Hz
Micrel
or about 0.01 µF. When doing this, the output capacitor must
be increased to 3.3 µF to maintain stability. These changes
reduce the output noise from 430 µV to 100 µV rms for a 100
kHz bandwidth at 5V output. With the bypass capacitor
added, noise no longer scales with output voltage so that
improvements are more dramatic at higher output voltages.
OUTPUT
VOLTAGE
4.75V
ERROR NOT *
VALID
INPUT
VOLTAGE
5V
1.3V
N*OT
VALID
* SEE APPLICATIONS INFORMATION
Figure 1. ERROR Output Timing
Typical Applications
+VIN
100kΩ
8
VIN
ERROR
OUTPUT
5 ERROR
VOUT 1
MIC2951
SHUTDOWN
INPUT
3
SD
OFF
GND
ON 4
FB
7
1.23V
VOUT = V REF
x (1 +
R1
R2
)
VOUT
1.2 30V
3.3µF
R1 100
pF
VREF
R2
3
NOTE: PINS 2 AND 6 ARE LEFT OPEN
*SEE APPLICATIONS
INFORMATION
Figure 2. Adjustable Regulator
870 23
*SLEEP
INPUT
+V IN
C-MOS
GATE
47kΩ
8
+V IN
ERROR
OUTPUT
5 ERROR
VOUT 1
MIC2951
SHUTDOWN
INPUT
3
SD
OFF GND
FB
ON 4 7
470 kΩ
+V OUT
2N3906
100pF
200kΩ
1% +
100kΩ
3.3µF
1%
100kΩ
*HIGH INPUT LOWERS VOUT TO 2.5V
5V Regulator with 2.5V Sleep Function
+VIN
8
ERROR
OUTPUT
+VIN
870 25
5 ERROR VOUT 1 *VOUT ≈VIN
MIC2951
SHUTDOWN
INPUT
3
SD
OFF
GND
ON 4
FB
7
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV TO 400mV,
DEPENDING ON LOAD CURRENT.
Wide Input Voltage Range Current Limiter
February 1999
3-59
11 Page | ||
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| PDF Descargar | [ Datasheet MIC2950-06BZ.PDF ] | |
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