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参数资料
| 型号： | MIC37112YM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 1A 8SOIC |
| 特色产品： | MIC37110/112 and MIC37120/122 LDOs |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调至 1V |
| 输入电压： | 2.375 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.23V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A |
| 电流 - 限制（最小）： | 1.2A |
| 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) |
Micrel, Inc.
MIC37110/MIC37112
MIC37120/MIC37122
Minimum Load Current
The MIC37112/22 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
V OUT
1.0V
1.1V
1.2V
1.5V
1.8V
2.2V
2.5V
3.0V
3.3V
3.6V
R1
0
10.0?
20.0?
49.9?
80.6?
121?
150?
200?
232?
261?
R2
?
100?
100?
100?
100?
100?
100?
100?
100?
100?
Table 1. Resistor Selection for Specific V OUT
Figure 2. Adjustable Regulator with Resistors
The MIC37112 and MIC37122 allow programming the
output voltage anywhere between 1.0V and 5.0V by
placing a resistor divider network from OUT to GND and
is determined by the following equation:
Thermal Measurements
It is always wise the measure the IC’s case temperature
to make sure that it is within its operating limits. Although
this might seem like a very elementary task, it is very
easy to get to get erroneous results. The most common
mistake is to use the standard thermal couple that
comes with the thermal voltage meter. This thermal
couple wire gauge is large, typically 22 gauge, and
behaves like a heatsink, resulting in a lower case
measurement.
V OUT = V ADJ × ?
+ 1 ?
? R1
? R2
?
?
There are two suggested methods for measuring the IC
case temperature: a thermal couple or an infrared
thermometer. If a thermal couple is used, it must be
constructed of 36 gauge wire or higher to minimize the
where:
V OUT is the desired output voltage and V ADJ = 1.0V.
Two resistors are used. Resistors can be quite large, but
the resistor (R1) value between the OUT pin and the
ADJ pin should not exceed 10 k?. Larger values can
cause instability.
The resistor values are calculated from the previous
equation, resulting in the following:
R1 = R2 × ( V OUT ? 1 )
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 Table 1 for a list of resistor combinations to set the
output voltage. A 1% tolerance is recommended for both
R1 and R2.
wire heatsinking effect. In addition, the thermal couple tip
must be covered in either thermal grease or thermal glue
to make sure that the thermal couple junction is making
good contact to the case of the IC. This thermal couple
from Omega (5SC-TT-K-36-36) is adequate for most
applications.
To avoid this messy thermal couple grease or glue, an
infrared thermometer is recommended. Most infrared
thermometers’ spot size is too large for an accurate
reading on small form factor ICs. However, an IR
thermometer from Optris has a 1mm spot size, which
makes it ideal for the MIC371xx 2mm x 2mm Thin MLF
package. Also, get the optional stand. The stand makes
it easy to hold the beam on the IC for long periods of
time.
Power SOIC-8 Thermal Characteristics
One of the secrets of the MIC37110/37120’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.
December 2012
15
M9999-121312-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC37112YMTTR | 制造商:Micrel 功能描述:LDO Regulator 1A Adj. 2% Low Noise MLF6 |
| MIC37112YMT-TR | 功能描述:Linear Voltage Regulator IC Positive Adjustable 1 Output 1 V ~ 5 V 1A 6-TMLF? (2x2) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 稳压器拓扑:正，可调式 电压 - 输出:1 V ~ 5 V 电流 - 输出:1A 电压 - 跌落（典型值）:0.23V @ 1A 稳压器数:1 电压 - 输入:2.375 V ~ 5.5 V 电流 - 限制（最小值）:1.2A 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-VDFN 裸露焊盘，6-TMLF? 供应商器件封装:6-TMLF?（2x2） 标准包装:1 |
| MIC37120-1.8YM | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High-Performance, Low-Noise, 1A LDOs |
| MIC37120-1.8YM TR | 制造商:Micrel Inc 功能描述:LDO Regulator Pos 1.8V 1A 6-Pin Thin MLF EP |
| MIC37120-1.8YMT | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High-Performance, Low-Noise, 1A LDOs |
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