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參數(shù)資料
| 型號： | MIC37301-1.8BR |
| 廠商： | MICREL INC |
| 元件分類： | 固定正電壓單路輸出LDO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 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 257K |
| 代理商： | MIC37301-1.8BR |
Micrel, Inc.
MIC37300/01/02/03
October 2009
9
M9999-102909
Applications Information
Enable/Shutdown
The MIC37300/01/02/03 is a high-performance low-
dropout voltage regulator suitable for moderate to
high-current regulator applications. Its 500mV dropout
voltage at full load and over-temperature makes it
especially valuable in battery-powered systems and
as high-efciency noise lters in post-regulator
applications.
Unlike
older
NPN-pass
transistor
designs, there the minimum dropout voltage is limited
by the based-to-emitter voltage drop and collector-to-
emitter saturation voltage, dropout performance of the
PNP output of these devices is limited only by the low
VCE saturation voltage.
A trade-off for the low dropout voltage is a varying
base drive requirement. Micrel’s Super eta PNP
process reduces this drive requirement to only 2% to
5% of the load current.
The MIC37300/01/02/03 regulator is fully protected
from damage due to fault conditions. Current limiting
is provided. This limiting is linear; output current
during overload conditions is constant. Thermal
shutdown
disables
the
device
when
the
die
temperature exceeds the maximum safe operating
temperature. The output structure of these regulators
allows voltages in excess of the desired output
voltage to be applied without reverse current ow.
Thermal Design
Linear regulators are simple to use. The most
complicated design parameters to consider are
thermal characteristics. Thermal design requires the
following application-specic parameters:
Maximum ambient temperature (TA)
Output current (IOUT)
Output voltage (VOUT)
Input voltage (VIN)
Ground current (IGND)
First, calculate the power dissipation of the regulator
from these numbers and the device parameters from
this datasheet.
PD = (VIN – VOUT) IOUT + VIN IGND
where the ground current is approximated by using
numbers from the “Electrical Characteristics” or
“Typical Characteristics.” Then the heat sink thermal
resistance is determined with this formula:
θSA = ((TJ(max) – TA)/ PD) – (θJC + θCS)
Where TJ(max) < 125°C and θCS is between 0°C and
2°C/W. The heat sink may be signicantly reduced in
applications where the minimum input voltage is
known and is large compared with the dropout
voltage. Use a series input resistor to drop excessive
voltage and distribute the heat between this resistor
and the regulator. The low-dropout properties of
Micrel’s Super eta PNP regulators allow signicant
reductions in regulator power dissipation and the
associated
heat
sink
without
compromising
performance. When this technique is employed, a
capacitor of at least 1.0F is needed directly between
the input and regulator ground.
Refer to “Application Note 9” for further details and
examples
on
thermal
design
and
heat
sink
applications.
Output Capacitor
The MIC37300/01/02/03 requires an output capacitor
for
stable
operation.
As
a
Cap
LDO,
the
MIC37300/01/02/03 can operate with ceramic output
capacitors as long as the amount of capacitance is
47F or greater. For values of output capacitance
lower than 47F, the recommended ESR range is
200m to 2. The minimum value of output
capacitance recommended for the MIC37300 is 10F.
For 47F or greater, the ESR range recommended is
less than 1. Ultra-low ESR, ceramic capacitors are
recommended for output capacitance of 47F or
greater to help improve transient response and noise
reduction at high frequency. X7R/X5R dielectric-type
ceramic capacitors are recommended because of
their temperature performance. X7R-type capacitors
change capacitance by 15% over their operating
temperature range and are the most stable type of
ceramic capacitors. Z5U and Y5V dielectric capacitors
change value by as much as 50% and 60%,
respectively, over their operating temperature ranges.
To use a ceramic chip capacitor with Y5V dielectric,
the value must be much higher than an X7R ceramic
capacitor to ensure the same minimum capacitance
over the equivalent operating temperature range.
Input Capacitor
An
input
capacitor
of
1.0F
or
greater
is
recommended when the device is more than 4 inches
away from the bulk supply capacitance, or when the
supply is a battery. Small, surface-mount chip
capacitors can be used for the bypassing. The
capacitor should be place within 1" of the device for
optimal performance. Larger values will help to
improve ripple rejection by bypassing the input to the
regulator, further improving the integrity of the output
voltage.
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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 |
| 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 |
| 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 |
| 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 |
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