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| 型号： | MIC2215-AAAYML |
| 厂商： | Micrel Inc |
| 文件页数： | 10/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .25A 16-MLF |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.25 V ~ 5.5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.17V @ 250mA |
| 稳压器数量： | 3 |
| 电流 - 输出： | 250mA |
| 电流 - 限制（最小）： | 350mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN Exposed Pad，16-MLF? |
| 供应商设备封装： | 16-MLF?（4x4） |
| 包装： | 托盘 |
Micrel, Inc.
The junction-to-ambient thermal resistance for the
minimum footprint is 43°C/W, from Table 2. The
maximum power dissipation must not be exceeded for
proper operation. Using a lithium-ion battery as the
supply voltage, 2.8V/250mA for channel 1, 3V/100mA for
channel 2 and 2.8V/50mA for channel 3, maximum
power can be calculated as follows:
MIC2215
Adjustable Regulator Application
Adjustable regulators use the ratio of two resistors to
multiply the reference voltage to produce the desired
output voltage. The MIC2215 can be adjusted from
1.25V to (5.5V–max V DROPOUT ) by using two external
resistors (Figure 1). The resistors set the output voltage
based on the following equation:
V OUT = V REF ? 1 +
?
P DLDO1 = (V IN1 – V OUT1 ) × I OUT1
P DLDO1 = (4.2V – 2.8V) × 250mA
P DLDO1 = 350mW
P DLDO2 = (V IN2 – V OUT2 ) × I OUT2
V REF = 1.25V
?
?
R1 ?
R2 ?
P DLDO2 = (4.2V – 3.0V) × 100mA
P DLDO2 = 120mW
P DLDO3 = (V IN3 – V OUT3 ) × I OUT3
P DLDO3 = (4.2V – 2.8V) × 50mA
P DLDO3 = 70mW
P DTOTAL = P DLDO1 + P DLDO2 + P DLDO3
P DTOTAL = 350mW + 120mW + 70mW
P DTOTAL = 540mW
The calculation shows that we are well below the
maximum allowable power dissipation of 1.511W for a
60°C ambient temperature. After the maximum power
dissipation has been calculated, it is always a good idea
to calculate the maximum ambient temperature for a
125°C junction temperature. Calculating maximum
ambient temperature as follows:
T A(max) = T J(max) – (P D x θ JA )
T A(max) =125°C – (540mW x 43°C/W)
T A(max) = 101°C
For more information, please refer to the Designing with
Low-Dropout Voltage Regulators Handbook.
MIC2215-AAA_ML
OUT1
R1
ADJ1
R2
Figure 1. Adjustable Output
January 2007
10
M9999-011207
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相关代理商/技术参数 |
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| MIC2215-AAAYML TR | 功能描述:低压差稳压器 - LDO Triple uCap LDO with High PSRR(Lead Free) RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC2215-AAAYMLTR | 制造商:Micrel 功能描述:LDO Regulator Pos 1.25V to 5.5V 0.25A |
| MIC2215-AAAYML-TR | 功能描述:Linear Voltage Regulator IC Positive Adjustable 3 Output 1.25 V ~ 5.5 V 250mA 16-MLF? (4x4) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 稳压器拓扑:正，可调式 电压 - 输出:1.25 V ~ 5.5 V 电流 - 输出:250mA 电压 - 跌落（典型值）:0.17V @ 250mA 稳压器数:3 电压 - 输入:2.25 V ~ 5.5 V 电流 - 限制（最小值）:350mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，16-MLF? 供应商器件封装:16-MLF?（4x4） 标准包装:1 |
| MIC2215-MMGYML TR | 功能描述:低压差稳压器 - LDO Triple Low Noise High PSRR Cap LDO (Lead Free) RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC2215-MMMBML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Triple High PSRR, Low Noise μCap LDO |
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