参数资料
| 型号： | MIC29201-12WU |
| 厂商： | Micrel Inc |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 12V .4A TO-263-5 |
| 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）： | 0.4V @ 400mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 400mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 供应商设备封装： | TO-263-5 |
| 包装： | 管件 |
| 产品目录页面： | 1107 (CN2011-ZH PDF) |
| 其它名称： | 576-2211 MIC29201-12WU-ND |
C BYPASS =
MIC2920A/29201/29202/29204
tor from 1μF to 220μF only decreases the noise from 430μV
to 160μV RMS for a 100kHz bandwidth at 5V output. Noise can
be reduced fourfold by a bypass capacitor across R 1 , since it
reduces the high frequency gain from 4 to unity. Pick
1
2 π R1 ? 200 Hz
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
Micrel, Inc.
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 coef?cients is yet another reason to use these
versatile regulators in automotive designs.
V IN
100K ?
+V IN
8
+V IN
V OUT
V OUT = 5V
ERROR
O U T PU T
5 ERROR
V IN
V OUT
1
V OUT
1.2
26V
+ 10μF
INPUT
SHUTDOWN 3
OFF
SHUTDOWN
GND ADJU ST
R 1 100
PF
10μF
GND
ON
4
7
1.23V
V OUT = V R E F X (1 +
R 1
R 2
)
V REF
R 2
NOTE: PINS 2 AND 6 ARE LEFT OPEN
Figure 2. MIC2920A-5.0 Fixed +5V Regulator
Figure 3. MIC29202/29204 Adjustable Regulator. Pinout is for
MIC29204.
≥ 5.3V
+V IN
V OUT 1
SD
OUTPUT
INPUT
8
+V IN
ERROR 5 ERROR
SHUTDOWN 3
OFF
GND ADJ U ST
*V OUT = V IN
SHUTDOWN
INPUT
HIGH = OFF
LOW = ON
3
SHUT-
DOWN
GND
4
8
+V IN
V OUT
ADJUST
7
1
100PF
300K ?
1%
+
V CC OUT
10μF
ON
4
7
HIGH = 5V OUT
470 K ?
220K ?
1%
180K ?
1%
* MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40MV TO 400MV, DEPENDING ON LOAD CURRENT
LOW = 3.3V OUT
2N2222
PIN 3 LOW= ENABLE OUTPUT. Q1 ON = 3.3V, Q1 OFF = 5.0V.
Figure 4. MIC29204 Wide Input Voltage Range Current Limiter
Figure 5. MIC29202/29204 5.0V or 3.3V Selectable Regulator
with Shutdown. Pinout is for MIC29204.
February 2005
9
M9999-021505
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