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| 型号： | MIC2937A-12BT |
| 厂商： | Micrel Inc |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 12V .75A TO-220-3 |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 12V |
| 输入电压： | 最高 26V |
| 电压 - 压降（标准）： | 0.37V @ 750mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 750mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-3 |
| 供应商设备封装： | TO-220-3 |
| 包装： | 管件 |
C BYPASS ?
MIC2937A/29371/29372
with a bypass capacitor across R 1 , since it reduces the high
frequency gain from 4 to unity. Pick
1
2 π R 1 ? 200 Hz
or about 0.01μF. When doing this, the output capacitor must
be increased to 10μF to maintain stability. These changes
reduce the output noise from 430μV to 100μV RMS for a 100
kHz 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
Micrel, Inc.
Automotive Applications
The MIC2937A 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 coef?cients is yet another reason to use these
versatile regulators in automotive designs.
V IN
+VIN
V IN
V OUT
V OUT
1.2V
26V
SHUTDOWN
INPUT
V REF
VOUT = VREF x (1 + )
R 1 .01
GND
V OUT
+
10μF
VOUT = 5V
ON
SHUTDOWN
OFF
GND ADJUST
1.23V
R1
R 2
R 2
μF
10μF
Figure 2. MIC2937A-5.0 Fixed +5V Regulator
Figure 3. MIC29372 Adjustable Regulator
+5V to +7V
+VIN
+V IN
V CC OUT
VIN
V OUT
VOUT ≈ VIN
SHUTDOWN
INPUT
ON
OFF
SHUTDOWN
GND ADJUST
V OUT
100pF
300k ?
1%
+
10μF
GND
ADJUST
5V
470 k ?
220k ?
1%
180k ?
1%
3.3V
Input
0
1
Output
3.3V
5.0V
2N2222
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40 m V TO 400 m V,
DEPENDING ON LOAD CURRENT.
Figure 4. MIC29372 Wide Input Voltage Range Current Limiter
SHUTDOWN PIN LOW= ENABLE OUTPUT. Q1 ON = 3.3V, Q1 OFF = 5.0V.
Figure 5. MIC29372 5.0V or 3.3V Selectable Regulator with
Shutdown.
May 2006
9
MIC2937A/29371/29372
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