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參數(shù)資料
| 型號： | MIC37102YM |
| 廠商： | MICREL INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1A LOW VOLTAGE U CAP LDO REGULATOR |
| 中文描述： | 1.24 V-6 V ADJUSTABLE POSITIVE LDO REGULATOR, 0.5 V DROPOUT, PDSO8 |
| 封裝： | LEAD FREE, POWER, SOIC-8 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 163K |
| 代理商： | MIC37102YM |
MIC37100/37101/37102
Micrel
M9999-091604
12
September 2004
Minimum Load Current
The MIC37100/01/02 regulator is specified between finite
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 regulation.
Adjustable Regulator Design
IN
R1
V
OUT
V
IN
C
OUT
R2
EN
OUT
ADJ
GND
MIC37102
ENABLE
SHUTDOWN
V
1.240V 1
R1
R2
OUT
=
+
Figure 2. Adjustable Regulator with Resistors
The MIC37102 allows programming the output voltage any-
where between 1.24V and the 6V 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:
R1 R2
V
1.240
1
OUT
Where V
O
is the desired output voltage. Figure 2 shows
component definition. Applications with widely varying load
currents may scale the resistors to draw the minimum load
current required for proper operation (see above).
Power SOIC-8 Thermal Characteristics
One of the secrets of the MIC37101/02
’
s performance is its
power SO-8 package featuring half the thermal resistance of
a standard SO-8 package. Lower thermal resistance means
more output current or higher input voltage for a given
package size.
Lower thermal resistance is achieved by joining the four
ground leads with the die attach paddle to create a single-
piece electrical and thermal conductor. This concept has
been used by MOSFET manufacturers for years, proving
very reliable and cost effective for the user.
Thermal resistance consists of two main elements,
θ
JC
(junction-to-case thermal resistance) and
θ
CA
(case-to-ambi-
ent thermal resistance). See Figure 3.
θ
JC
is the resistance
from the die to the leads of the package.
θ
CA
is the resistance
from the leads to the ambient air and it includes
θ
CS
(case-to-
sink thermal resistance) and
θ
SA
(sink-to-ambient thermal
resistance).
θ
JA
θ
JC
θ
CA
printed circuit board
Figure 3. Thermal Resistance
ground plane
heat sink area
SOIC-8
AMBIENT
Using the power SOIC-8 reduces the
θ
JC
dramatically and
allows the user to reduce
θ
CA
. The total thermal resistance,
θ
JA
(junction-to-ambient thermal resistance) is the limiting
factor in calculating the maximum power dissipation capabil-
ity of the device. Typically, the power SOIC-8 has a
θ
JC
of
20
°
C/W, this is significantly lower than the standard SOIC-8
which is typically 75
°
C/W.
θ
CA
is reduced because pins 5
through 8 can now be soldered directly to a ground plane
which significantly reduces the case-to-sink thermal resis-
tance and sink to ambient thermal resistance.
Low-dropout linear regulators from Micrel are rated to a
maximum junction temperature of 125
°
C. It is important not
to exceed this maximum junction temperature during opera-
tion of the device. To prevent this maximum junction tempera-
ture from being exceeded, the appropriate ground plane heat
sink must be used.
相關PDF資料 |
PDF描述 |
|---|---|
| MIC37101-2.5YM | 1A LOW VOLTAGE U CAP LDO REGULATOR |
| MIC37102BM | FPGA 1600000 SYSTEM GATE 1.8 VOLT - NOT RECOMMENDED for NEW DESIGN |
| MIC37102BR | FPGA 1600000 SYSTEM GATE 1.8 VOLT - NOT RECOMMENDED for NEW DESIGN |
| MIC37101-1.5YM | 1A LOW VOLTAGE U CAP LDO REGULATOR |
| MIC37101-1.65BM | FPGA 1600000 SYSTEM GATE 1.8 VOLT - NOT RECOMMENDED for NEW DESIGN |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MIC37102YM TR | 功能描述:低壓差穩(wěn)壓器 - LDO LV, 1.0A Cap Adj. Vout LDO in SO-8 (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 負載調節(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 |
| MIC37102YM | 制造商:Micrel Inc 功能描述:IC LDO REG 1A ADJ 8SOIC 制造商:Micrel Inc 功能描述:IC, LDO REG, 1A, ADJ, 8SOIC 制造商:Micrel Inc 功能描述:IC, LDO REG, 1A, ADJ, 8SOIC; Primary Input Voltage:6V; Dropout Voltage Vdo:280mV; Voltage Regulator Case Style:SOIC; No. of Pins:8; Output Current:1A; Operating Temperature Min:-40C; Operating Temperature Max:125C; SVHC:No SVHC ;RoHS Compliant: Yes |
| MIC37110 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:High-Performance, Low-Noise, 1A LDOs |
| MIC37110-1.8YM | 制造商:Micrel Inc 功能描述:LDO Regulator Pos 1.8V 1A 8-Pin SOIC |
| MIC37110-1.8YM TR | 功能描述:低壓差穩(wěn)壓器 - LDO High Performance, Low Noise 1A LDO 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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