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參數(shù)資料
| 型號： | MIC5231-3.0BM5 |
| 廠商： | MICREL INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Multiconductor Cable; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes RoHS Compliant: Yes |
| 中文描述： | 3 V FIXED POSITIVE LDO REGULATOR, 0.3 V DROPOUT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 71K |
| 代理商： | MIC5231-3.0BM5 |
June 2000
5
MIC5231
MIC5231
Block Diagram
Micrel
Applications Information
Input Capacitor
A 0.1
μ
F (or larger) capacitor should be placed from the IN
(supply input) to GND (ground) if there is more than 20 cm of
wire between IN and the ac filter capacitor or if supplied from
a battery.
Output Capacitors
The MIC5231 does not require an output capacitor for stabil-
ity. A 1
μ
F or larger capacitor is recommended between OUT
(output) and GND to improve the regulator
’
s transient re-
sponse. A 0.1
μ
F capacitor can be used to reduce overshoot
recovery time at the expense of overshoot amplitude. The
ESR (effective series resistance) of this capacitor has no
effect on regulator stability, but low-ESR capacitors improve
high frequency transient response. The value of this capaci-
tor may be increased without limit, but values larger than
10
μ
F tend to increase the settling time after a step change in
input voltage or output current.
The MIC5231 has no minimum load current; it will remain
stable and in regulation with no load (other than the internal
voltage divider). This is especially important in real-time clock
and CMOS RAM keep-alive applications.
Minimum Load Current
The MIC5231 does not require a minimum load for proper
operation. This allows the device to operate in applications
where very light output currents are required for keep-alive
purposes. This is important for powering SRAM or Flash
memory in low-power modes for handheld devices.
Safe Operating Conditions
The MIC5231 does not incorporate current limit or thermal
shutdown in the design. The output pass element is approxi-
mately 15 ohms, therefore, when a short occurs from the
output to ground, the current is self-limited. The pass element
has a positive temperature coefficient, such that when the
device gets hot, the output impedance goes up, limiting the
current even further. The maximum junction temperature for
the device is 125
°
C, and it is important that this is not
exceeded for any length of time.
Thermal Considerations
The MIC5231 is not intended for sourcing currents that would
cause a large power loss in the device, but since it is not
current limited, it is possible to source more than the rated
10mA. At this point, it is important to ensure that the die
temperature does not exceed 125
°
C.
Power dissipation in the regulator is calculated as follows:
P
D
= (V
IN
–
V
OUT
)*I
OUT
+ V
IN
*I
GND
The MIC5231 consumes only 0.65uA over load and does not
need to consider that contribution in the power dissipation
equation, therefore the equation is simplified.
P
D
= (V
IN
–
V
OUT
)*I
OUT
The MIC5231, in the IttyBitty SOT23-5 package, has a
thermal resistance, junction-to-ambient, of 235
°
C/W. Using
this number, the power dissipation capability of that package,
without exceeding a 125
°
C junction temperature rating, can
easily be calculated.
P
D(max)
= (T
j(max)
–
Ta)/
θ
JA
P
D(max)
= (125
°
C
–
Ta)/235
°
C/W
If the device is being operated at 85
°
C, the maximum power
IN
OUT
GND
EN
MIC5231
Bandgap
Reference
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC5231 | ECONOLINE: RZ - 1kVDC Isolation- SMD Package Styles- 5V, 12V and 15V Output- UL94V-0 Package Material- No Heatsink Required- No Extern. Components- Toroidal Magnetics- Efficiency to 62% |
| MIC5231-2.75BM5 | ECONOLINE: RZ - 1kVDC Isolation- SMD Package Styles- 5V, 12V and 15V Output- UL94V-0 Package Material- No Heatsink Required- No Extern. Components- Toroidal Magnetics- Efficiency to 62% |
| MIC5231-3.3BM5 | ECONOLINE: RZ - 1kVDC Isolation- SMD Package Styles- 5V, 12V and 15V Output- UL94V-0 Package Material- No Heatsink Required- No Extern. Components- Toroidal Magnetics- Efficiency to 62% |
| MIC5231-5.0BM5 | RZ Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 05V; Power: 0.5W; 1kVDC Isolation; SMD Package Styles; Single Regulated Output(Internal Linear Regulator); UL94V-0 Package Material; Optional Continuous Short Circuit Protected; Fully Encapsulated; Efficiency to 62% |
| mic5231 | Micropower μCap LDO Regulator(微功耗μCap技術(shù)低壓差穩(wěn)壓器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC5231-5.0BM5 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Micropower レCap LDO Regulator Preliminary Information |
| MIC5231-5.0BM5 TR | 功能描述:IC REG LDO 5V 10MA SOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:500 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:12V 輸入電壓:14.5 V ~ 35 V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:500mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:TO-205AD，TO-39-3 金屬罐 供應(yīng)商設(shè)備封裝:TO-39 包裝:散裝 其它名稱:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5231-5.0YM5 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Micropower μCap LDO Regulator |
| MIC5231-5.0YM5 TR | 功能描述:低壓差穩(wěn)壓器 - LDO Ultra Low Iq LDO Regulator(Lead Free) 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 |
| MIC5231-5.0YM5TR | 制造商:Micrel 功能描述:LDO Regulator Pos 5V 0.01A |
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