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参数资料
| 型号： | MIC37101-3.3BM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V 1A 8-SOIC |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 6V |
| 电压 - 压降（标准）： | 0.28V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC37101-3.3BMTR MIC37101-3.3BMTR-ND |
Micrel, Inc.
without operating in dropout, NPN-based regulators
require an input voltage of 3.7V at the very least. The
MIC37100 regulator will provide excellent performance
with an input as low as 3.0V or 2.5V respectively. This
gives the PNP based regulators a distinct advantage
over older, NPN based linear regulators.
Minimum Load Current
The MIC37100/01/02 regulator is speci ? ed 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 regulation.
Adjustable Regulator Design
MIC37102
MIC37100/37101/37102
Thermal resistance consists of two main elements, θ JC
(junction-to-case thermal resistance) and θ CA (case-to-
ambient 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).
SOIC-8
V IN
IN
OUT
V OUT
JA
ENABLE
SHUTDOWN
EN
ADJ
GND
R1
R2
C OUT
JC
CA
AMBIENT
ground plane
heat sink area
printed circuit board
V OUT = 1.240V ? 1 +
?
R1 = R2 ? ? OUT ? 1 ? ?
? R1 ?
? R2 ?
Figure 2. Adjustable Regulator with Resistors
The MIC37102 allows programming the output voltage
anywhere 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:
? V ?
? 1.240 ?
Where V O is the desired output voltage. Figure 2 shows
component de ? nition. Applications with widely varying
load currents may scale the resistors to draw the
minimum load current required for proper operation (see
above).
Figure 3. Thermal Resistance
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 capability of the device. Typically, the power
SOIC-8 has a θ JC of 20°C/W, this is signi ? cantly 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 signi ? cantly
reduces the case-to-sink thermal resistance 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
operation of the device. To prevent this maximum
junction temperature from being exceeded, the
appropriate ground plane heat sink must be used.
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
700
600
500
400
300
200
100
0
0
T JA =
0.25 0.50 0.75 1.00 1.25 1.50
POWER DISSIPATION (W)
user.
Figure 4. Copper Area vs. Power SO-8
Power Dissipation
September 2007
12
M9999-090607
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC37102BM | 功能描述:IC REG LDO ADJ 1A 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC37102BM TR | 功能描述:IC REG LDO ADJ 1A 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC37102BMTR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MIC37102BR | 功能描述:IC REG LDO ADJ 1A SPAK-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC37102BR TR | 功能描述:IC REG LDO ADJ 1A SPAK-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
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