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參數(shù)資料
| 型號(hào)： | MIC2920A-12WS |
| 廠商： | MICREL INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 400mA Low-Dropout Voltage Regulator |
| 中文描述： | 12 V FIXED POSITIVE LDO REGULATOR, 0.75 V DROPOUT, PDSO4 |
| 封裝： | LEAD FREE, SOT-223, 4 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 415K |
| 代理商： | MIC2920A-12WS |
MIC2920A/29201/29202/29204
Micrel, Inc.
February 2005
9
M9999-021505
SHUT-
DOWN
V
GND
4
7
8
OUT
+VIN
ADJUST
1
3
SHUTDOWN
INPUT
100pF
2N2222
1%
300k
≥
5.3V
1%
180k
+
10μF
470 k
HIGH = OFF
LOW = ON
LOW = 3.3V OUT
220k
1%
VCC OUT
HIGH = 5V OUT
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.
tor from 1μF to 220μF only decreases the noise from 430μV
to 160μV
for a 100kHz bandwidth at 5V output. Noise can
be reduced fourfold by a bypass capacitor across R
, since it
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.
NOTE: PINS 2 AND 6 ARE LEFT OPEN
IN
OUT
GND ADJUST
4
ERROR
5
3
1
8
V
SHUTDOWN
V
ERROR
OUTPUT
SHUTDOWN
INPUT
IN
+V
100k
OUT
1.2
V
26V
1
R
100
pF
10μF
2
R
1.23V
REF
V
7
VOUT = VREF x (1 +
)
1
2
R
R
OFF
ON
IN
OUT
GND
V
+V
IN
V
OUT
V
= 5V
10μF
+
Figure 2. MIC2920A-5.0 Fixed +5V Regulator
Figure 3. MIC29202/29204 Adjustable Regulator. Pinout is for
MIC29204.
Typical Applications
Figure 5. MIC29202/29204 5.0V or 3.3V Selectable Regulator
with Shutdown. Pinout is for MIC29204.
Figure 4. MIC29204 Wide Input Voltage Range Current Limiter
PIN 3 LOW= ENABLE OUTPUT. Q1 ON = 3.3V, Q1 OFF = 5.0V.
C
BYPASS
1
2
π
R1 200 Hz
=
IN
OUT
GND ADJUST
4
ERROR
5
3
1
8
SD
V
+V
ERROR
OUTPUT
SHUTDOWN
INPUT
IN
+V
OUT
*V
7
OFF
ON
IN
= V
* Minimum Input-Output Voltage ranges from 40mV to 400mV, depending on load current
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2920A-12WT | 400mA Low-Dropout Voltage Regulator |
| MIC2920A-3.3WS | 400mA Low-Dropout Voltage Regulator |
| MIC2920A-3.3WT | 400mA Low-Dropout Voltage Regulator |
| MIC2920A-4.8WS | 400mA Low-Dropout Voltage Regulator |
| MIC2920A-4.8WT | 400mA Low-Dropout Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2920A-12WS TR | 功能描述:低壓差穩(wěn)壓器 - LDO 400mA LDO Fixed Volt. (ROHS Compliant) RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC2920A-12WS | 制造商:Micrel Inc 功能描述:Linear Voltage Regulator IC |
| MIC2920A-12WT | 功能描述:低壓差穩(wěn)壓器 - LDO 400mA LDO Fixed Volt. (ROHS Compliant) RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC2920A-3.3BS | 功能描述:IC REG LDO 3.3V .4A SOT223 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.3V @ 80mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:80mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC2920A-3.3BS TR | 功能描述:IC REG LDO 3.3V .4A SOT223 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.3V @ 80mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:80mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
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