參數(shù)資料
型號(hào)： MIC37301-1.8BR
廠商： MICREL INC
元件分類(lèi)： 固定正電壓?jiǎn)温份敵鯨DO穩(wěn)壓器
英文描述： 3.0A, LOW VOLTAGE UCAP LDO REGULATOR
中文描述： 1.8 V FIXED POSITIVE LDO REGULATOR, 0.55 V DROPOUT, PSSO5
封裝： SPAK-5
文件頁(yè)數(shù)： 2/13頁(yè)
文件大?。?/td> 257K
代理商： MIC37301-1.8BR
Micrel, Inc.
MIC37300/01/02/03
October 2009
10
M9999-102909
Transient Response and 3.3V to 2.5V, 2.5V to 1.8V
or 1.65V, or 2.5V to 1.5V Conversions
The MIC37300/01/02/03 has excellent transient
response to variations in input voltage and load
current. The device has been designed to respond
quickly to load current variations and input voltage
variations. Large output capacitors are not required to
obtain this performance. A standard 47F output
capacitor, preferably tantalum, is all that is required.
Larger values help to improve performance even
further.
By virtue of its low-dropout voltage, this device does
not saturate into dropout as readily as similar NPN-
based designs. When converting from 3.3V to 2.5V,
2.5V to 1.8V or 1.65V, or 2.5V to 1.5V, the NPN-
based regulators are already operating in dropout,
with typical dropout requirements of 1.2V or greater.
To convert down to 2.5V without operating in dropout,
NPN-based regulators require an input voltage of 3.7V
at the very least. The MIC37300/01/02/03 regulator
will provide excellent performance with an input as low
as 3.0V or 2.25V, respectively. This gives the PNP-
based regulators a distinct advantage over older,
NPN-based linear regulators.
Minimum Load Current
The
MIC37300/01/02/03
regulator
is
specied
between nite loads. If the output current is too small,
leakage currents dominate and the output voltage
rises. A 10mA minimum load current is necessary for
proper operation.
Error Flag
The MIC37301 and MIC37303 feature an error ag
circuit that monitors the output voltage and signals an
error condition when the voltage is 5% below the
nominal output voltage. The error ag is an open-
collector output that can sink 10mA during a fault
condition.
Low output voltage can be caused by a number of
problems, including an overcurrent fault (device in
current limit) or low input voltage. The ag is
inoperative during overtemperature shutdown.
Enable Input
The MIC37301/02/03 also features an enable input for
on/off control of the device. Its shutdown state draws
“zero” current (only microamperes of leakage). The
enable input is TTL/CMOS compatible for simple logic
interface, but can be connected up to VIN. When
enabled, it draws approximately 15A.
Adjustable Regulator Design
IN
R1
VOUT
VIN
COUT
R2
EN
OUT
ADJ
GND
MIC37302
ENABLE
SHUTDOWN
V
1.240V 1
R1
R2
OUT =+
Figure 1. Adjustable Regulator with Resistors
The MIC37302 and MIC37303 allow programming the
output voltage any-where between 1.24V and the
5.5V maximum operating rating of the family. Two
resistors are used. Resistors can be quite large, up to
1M, because of the very high input impedance and
low bias current of the sense comparator. The resistor
values are calculated by:
=
1
1.240
V
R2
R1
OUT
Where VOUT is the desired output voltage. Figure 1
shows component denition. Applications with widely
varying load currents may scale the resistors to draw
the minimum load current required for proper
operation (see above).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MIC37301-2.5BR 功能描述:IC REG LDO 2.5V 3A SPAK-5 RoHS:否 類(lèi)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(lèi)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
MIC37301-2.5BR TR 功能描述:IC REG LDO 2.5V 3A SPAK-5 RoHS:否 類(lèi)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（最小）:- 工作溫度:-40°C ~ 125°C 安裝類(lèi)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
MIC37301-2.5WR 功能描述:低壓差穩(wěn)壓器 - LDO 3A Low Voltage LDO Regulator(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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MIC37301-2.5WR TR 功能描述:低壓差穩(wěn)壓器 - LDO 3A Low Voltage LDO Regulator(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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MIC37301-2.5YME 功能描述:低壓差穩(wěn)壓器 - LDO 3A, Low Voltage Cap LDO Regulator 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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
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