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參數(shù)資料
| 型號(hào)： | MIC29712 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 7.5A Fast-Response LDO Regulator(輸出電流7.5A 快速瞬變反應(yīng)低壓差穩(wěn)壓器) |
| 中文描述： | 7.5A的快速響應(yīng)LDO穩(wěn)壓器（輸出電流7.5A的快速瞬變反應(yīng)低壓差穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 80K |
| 代理商： | MIC29712 |
MIC29710/29712
Applications Information
The MIC29710 and MIC29712 are high performance low-
dropout voltage regulators suitable for all moderate to high-
current voltage regulator applications. Their 700mV of drop-
out voltage at full load make them especially valuable in
battery powered systems and as high efficiency noise filters
in “post-regulator” applications. Unlike older NPN-pass tran-
sistor designs, where the minimum dropout voltage is limited
by the base-emitter voltage drop and collector-emitter satu-
ration voltage, dropout performance of the PNP output of
these devices is limited merely by the low V
CE
saturation
voltage. Output regulation is excellent across the input volt-
age, output current, and temperature ranges. The MIC29710/
712 does not have a minimum load current limitation.
A trade-off for the low dropout voltage is a varying base drive
requirement. But Micrel’s Super eta PNP process re-
duces this drive requirement to merely 2 to 5% of the load
current.
MIC29710/712 regulators are fully protected from damage
due to fault conditions. Current limiting is provided. The
output current under overload conditions is limited to a
constant value. Thermal shutdown disables the device when
the die temperature exceeds the maximum safe operating
temperature. Transient protection allows device (and load)
survival even when the input voltage spike above and below
nominal. The MIC29712 version offers a logic level ON/OFF
control: when disabled, the devices draw nearly zero current.
An additional feature of this regulator family is a common
pinout: a design’s current requirement may change up or
down yet use the same board layout, as all of Micrel’s high-
current Super eta PNP regulators have identical pinouts.
Micrel
3-110
1997
VIN
VOUT
Figure 3. The MIC29710 requires only two capacitors
for operation.
Thermal Design
Linear regulators are simple to use. The most complicated
design parameters to consider are thermal characteristics.
Thermal design requires the following application-specific
parameters:
Maximum ambient temperature, T
A
Output Current, I
OUT
Output Voltage, V
OUT
Input Voltage, V
IN
First, we calculate the power dissipation of the regulator from
these numbers and the device parameters from this datasheet.
P
D
= I
OUT
×
(1.03V
IN
– V
OUT
)
Where the ground current is approximated by 3% of I
OUT
.
Then the heat sink thermal resistance is determined with this
formula:
T
J MAX
– T
A
θ
SA
= —————— – (
θ
JC
+
θ
CS
)
P
D
Where T
J MAX
≤
125
°
C and
θ
CS
is between 0 and 2
°
C/W.
The heat sink may be significantly 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 Super eta PNP regulators allow very
significant reductions in regulator power dissipation and the
associated heat sink without compromising performance.
When this technique is employed, a capacitor of at least
0.1
μ
F is needed directly between the input and regulator
ground.
Please refer to Application Note 9 for further details and
examples on thermal design and heat sink specification.
Capacitor Requirements
For stability and minimum output noise, a capacitor on the
regulator output is necessary. The value of this capacitor is
dependent upon the output current; lower currents allow
smaller capacitors. MIC29710/2 regulators are stable with a
minimum capacitor value of 47
μ
F at full load.
This capacitor need not be an expensive low ESR type:
aluminum electrolytics are adequate. In fact, extremely low
ESR capacitors may contribute to instability. Tantalum ca-
pacitors are recommended for systems where fast load
transient response is important.
Where the regulator is powered from a source with a high AC
impedance, a 0.1
μ
F capacitor connected between Input and
GND is recommended. This capacitor should have good
characteristics to above 250kHz.
Transient Response and 5V to 3.3V Conversion
The MIC29710/2 have excellent response to variations in
input voltage and load current. By virtue of their low dropout
voltage, these devices do not saturate into dropout as readily
as similar NPN-based designs. A 3.3V output Micrel LDO will
maintain full speed and performance with an input supply as
low as 4.2V, and will still provide some regulation with
supplies down to 3.8V, unlike NPN devices that require 5.1V
or more for good performance and become nothing more
than a resistor under 4.6V of input. Micrel’s PNP regulators
provide superior performance in “5V to 3.3V” conversion
applications, especially when all tolerances are considered.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC29712BT | 功能描述:IC REG LDO 7.5A ADJ TO-220-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| MIC29712BT L2 | 制造商:Micrel 功能描述:The Micrel MIC29712BT L2 is a Low Dropout Voltage Regulator. |
| MIC29712WT | 功能描述:低壓差穩(wěn)壓器 - LDO 7.5A LDO Adj. + Shutdown (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 |
| MIC29750-3.3BWT | 功能描述:IC REG LDO 3.3V 7.5A TO-247-3 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 |
| MIC29750-3.3WWT | 功能描述:低壓差穩(wěn)壓器 - LDO 7.5A LDO Fixed Voltage(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 |
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