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參數(shù)資料
| 型號： | MIC2937A-3.3WT |
| 廠商： | MICREL INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 750mA Low-Dropout Voltage Regulator |
| 中文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.75 V DROPOUT, SFM3 |
| 封裝： | ROHS COMPLIANT, TO-220, 3 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 263K |
| 代理商： | MIC2937A-3.3WT |
MIC2937A/29371/29372
Micrel, Inc.
May 2006
9
MIC2937A/29371/29372
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 coefficients is yet another reason to use these
versatile regulators in automotive designs.
Figure 2. MIC2937A-5.0 Fixed +5V Regulator
Figure 3. MIC29372 Adjustable Regulator
Typical Applications
Figure 5. MIC29372 5.0V or 3.3V Selectable Regulator with
Shutdown.
Figure 4. MIC29372 Wide Input Voltage Range Current Limiter
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40
m
V TO 400
m
V,
DEPENDING ON LOAD CURRENT.
SHUTDOWN PIN LOW= ENABLE OUTPUT. Q1 ON = 3.3V, Q1 OFF = 5.0V.
C
BYPASS
1
2 R
1
200 Hz
with 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
reduce the output noise from 430μV to 100μV
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.
GND
+VIN
OUT
V
V
10μF
+
IN
VOUT = 5V
IN
OUT
V
GND ADJUST
SHUTDOWN
V
SHUTDOWN
INPUT
OUT
V
1.2V
26V
1
R
.01
μF
10μF
2
R
1.23V
REF
V
VOUT = VREF x (1 + 1
2
R
R
OFF
ON
OUT
V
GND
ADJUST
VIN
+VIN
VOUT≈ VIN
SHUTDOWN
V
GND
OUT
+VIN
ADJUST
SHUTDOWN
INPUT
100pF
2N2222
1%
300k
+5V to +7V
1%
180k
+
10μF
470 k
OFF
ON
5V
3.3V
220k
1%
VCC OUT
Input
0
1
Output
3.3V
5.0V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2937A-3.3WU | 750mA Low-Dropout Voltage Regulator |
| MIC2937A-5.0WT | 750mA Low-Dropout Voltage Regulator |
| MIC2937A-5.0WU | 750mA Low-Dropout Voltage Regulator |
| MIC29371 | 750mA Low-Dropout Voltage Regulator |
| MIC29371-12WT | 750mA Low-Dropout Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2937A-5.0BT | 功能描述:IC REG LDO 5V .75A TO220-3 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標準）: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 供應商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC2937A-5.0BU | 功能描述:IC REG LDO 5V .75A TO263 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標準）: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 供應商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC2937A-5.0BU TR | 功能描述:IC REG LDO 5V .75A TO-263-3 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標準）:0.3V @ 80mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:80mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC2937A-5.0WT | 功能描述:低壓差穩(wěn)壓器 - LDO 750mA 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC2937A-5.0WU | 功能描述:低壓差穩(wěn)壓器 - LDO 750mA 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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