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参数资料
| 型号： | MIC61300YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 3A 10-MLF |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.5 V ~ 3 V |
| 输入电压： | 1.1 V ~ 3.6 V |
| 电压 - 压降（标准）： | 0.15V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3.5A |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘，10-MLF? |
| 供应商设备封装： | 10-MLF?（3x3） |
| 包装： | 标准包装 |
| 其它名称： | 576-3767-6 |
Micrel, Inc.
Adjustable Regulator Design
The MIC61300 adjustable version allows programming
the output voltage from 0.5V to 3.0V by placing a resistor
divider network (R1, R2) from V OUT to GND (see
Application Circuit). The high side of R1 should be
connected at the point-of-load for high-accuracy Kelvin
sensing. V OUT is determined by the following equation:
MIC61300
Thermal Design
Linear regulators are simple to use. The most
complicated design parameters to consider are thermal
characteristics. To help reduce the thermal resistance,
the ePad (underneath the IC) should be soldered to the
PCB ground and the placement of thermal vias either
underneath or near the ePad is highly recommended.
Thermal design requires the following application-
V OUT = 0.5 × ?
+ 1 ?
? R1
? R2
?
?
Eq. 1
speci ? c parameters:
? Maximum ambient temperature (T A )
? Output current (I OUT )
where V OUT is the desired output voltage.
The resistor (R2) value between the FB pin and GND is
selected to maintain a minimum 10mA load on the
output.
The resistor values are calculated from the previous
equation, resulting in the following:
? Output voltage (V OUT )
? Input voltage (V IN )
? Ground current (I GND )
First, calculate the power dissipation of the regulator
from these numbers and the device parameters from this
datasheet:
R1 = R2 × ? ? OUT ? 1 ? ?
? V ?
? 0.5 ?
Eq. 2
P D = (V IN - V OUT ) × I OUT + (V IN × I GND ) Eq. 3
where the ground current is approximated by using
numbers from the Electrical Characteristics or Typical
Table 1 is a list of resistor combinations to set the output
voltage. A 1% tolerance is recommended for both R1
and R2. For a unity gain, 0.5V output voltage, connect
the FB pin directly to the output.
Characteristics sections
For example, given an expected maximum ambient
temperature (T A ) of 75 ° C with V IN = 1.2V, V OUT = 0.9V,
and I OUT = 1.5A, first calculate the expected P D using
Equation 1:
V OUT
0.5V
0.6V
0.7V
0.8V
0.9V
1.0
1.1V
1.2V
1.5V
1.8V
2.2V
R1
?
10.0 ?
20.0 ?
30.1 ?
40.2 ?
49.9 ?
60.4 ?
69.8 ?
100 ?
130 ?
169 ?
R2
49.9 ?
49.9 ?
49.9 ?
49.9 ?
49.9 ?
49.9 ?
49.9 ?
49.9 ?
49.9 ?
49.9 ?
49.9 ?
P D = (1.2V – 0.9V) × 1.5A + 1.2V × 0.015A
= 0.468W Eq. 4
Next, determnine the junction temperature for the
expected power dissipation above using the thermal
resistance ( θ JA ) of the 10-pin 3mm × 3mm MLF ? (YML)
adhering to the following criteria for the PCB design:
1oz. copper and 100mm 2 copper area for the
MIC61300.
T J = ( θ JA × P D ) + T A
= (60.7 ° C/W × 0.468W) + 75 ° C
= 103.4 ° C Eq. 5
Table 1. Resistor Selection for Specific V OUT
October 2011
13
M9999-101111-B
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