MIC2920A-12WS Micrel Inc, MIC2920A-12WS Datasheet - Page 9

• Manufacturer Part Number: MIC2920A-12WS
• Description: IC REG LDO 400MA 12V SOT-223
• Manufacturer: Micrel Inc

Specifications of MIC2920A-12WS

• Regulator Topology: Positive Fixed
• Voltage - Output: 12V
• Voltage - Input: Up to 26V
• Voltage - Dropout (typical): 0.4V @ 400mA
• Number Of Regulators: 1
• Current - Output: 400mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-223 (3 leads + Tab), SC-73, TO-261
• Primary Input Voltage: 26V
• Output Voltage Fixed: 12V
• Dropout Voltage Vdo: 370mV
• No. Of Pins: 3
• Output Current: 400mA
• Operating Temperature Range: -40°C To +125°C
• Termination Type: SMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 576-1750-5; MIC2920A-12WS

MIC2920A/29201/29202/29204
tor from 1µF to 220µF only decreases the noise from 430µV
to 160µV
be reduced fourfold by a bypass capacitor across R
reduces the high frequency gain from 4 to unity. Pick
or about 0.01µF. When doing this, the output capacitor must
be increased to 10µF to maintain stability. These changes re-
duce the output noise from 430µV to 100µV rms for a 100kHz
bandwidth at 5V output. With the bypass capacitor added,
noise no longer scales with output voltage so that improve-
ments are more dramatic at higher output voltages.
Typical Applications
Figure 4. MIC29204 Wide Input Voltage Range Current Limiter
February 2005
ON
* Minimum Input-Output Voltage ranges from 40mV to 400mV, depending on load current
E R R O R
O U T PU T
SHUTDOWN
INPUT
Figure 2. MIC2920A-5.0 Fixed +5V Regulator
RMS
for a 100kHz bandwidth at 5V output. Noise can
C
BYPASS
O F F
5
3
+V
GND
E R R O R
SD
V
IN
IN
=
GND ADJ U ST
2 πR1 • 200 Hz
V
4
+V
OUT
+V
8
IN
IN
1
V
7
OUT
V
OUT
+
1
10µF
*V
= 5V
OUT
= V
IN
1
, since it
9
Automotive Applications
The MIC2920A is ideally suited for automotive applications
for a variety of reasons. It will operate over a wide range of
input voltages with very low dropout voltages (40mV at light
loads), and very low quiescent currents (100µA typical). These
features are necessary for use in battery powered systems,
such as automobiles. It is a “bulletproof” device with the abil-
ity to survive both reverse battery (negative transients up to
20V below ground), and load dump (positive transients up to
60V) conditions. A wide operating temperature range with low
temperature coefficients is yet another reason to use these
versatile regulators in automotive designs.
Figure 5. MIC29202/29204 5.0V or 3.3V Selectable Regulator
with Shutdown. Pinout is for MIC29204.
Figure 3. MIC29202/29204 Adjustable Regulator. Pinout is for
NOTE: PINS 2 AND 6 ARE LEFT OPEN
ON
LOW = ON
LOW = 3.3V OUT
SHUTDOWN
INPUT
V OUT = V R E F x (1 +
E R R O R
O U T PU T
SHUTDOWN
INPUT
HIGH = 5V OUT
HIGH = OFF
PIN 3 LOW= ENABLE OUTPUT. Q1 ON = 3.3V, Q1 OFF = 5.0V.
3
SHUT-
DOWN
O F F
100kΩ
GND
5
3
4
E R R O R
SHUTDOWN
≥ 5.3V
+V IN
R
R
470 kΩ
GND ADJU ST
8
1
2
ADJUST
)
4
MIC29204.
V
7
OUT
+V
8
V
IN
IN
V
1
R E F
V
7
OUT
100pF
220kΩ
1%
1.23V
2N2222
1
300kΩ
180kΩ
1%
R
1%
R
V
1.2
1
OUT
2
100
pF
+
M9999-021505
26V
Micrel, Inc.
V CC OUT
10µF
10µF