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| 型号： | MCP1727T-1802E/SN |
| 厂商： | Microchip Technology |
| 文件页数： | 20/32页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V 1.5A 8SOIC |
| 产品培训模块： | High Current LDOs |
| 标准包装： | 3,300 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.8V |
| 输入电压： | 2.3 V ~ 6 V |
| 电压 - 压降（标准）： | 0.33V @ 1.5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.5A（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-SOICN |
| 包装： | 带卷 (TR) |
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MCP1727
5.0
5.1
APPLICATION CIRCUITS/
ISSUES
Typical Application
In addition to the LDO pass element power dissipation,
there is power dissipation within the MCP1727 as a
result of quiescent or ground current. The power
dissipation as a result of the ground current can be
calculated using the following equation:
The MCP1727 is used for applications that require high
LDO output current and a power good output.
MCP1727-2.5
EQUATION 5-2:
P I ( GND ) = V IN ( MAX ) × I VIN
Where:
V IN = 3.3V
C 1
10 μF
On
O ff
1 V IN V OUT 8
2 V IN Sense 7
3 SHDN C DELAY 6
4 GND PWRGD 5
V OUT = 2.5V @ 1.5A
R 1
10k Ω C 2
10 μF
C 3
1000 pF
P I(GND
V IN(MAX)
I VIN
=
=
=
Power dissipation due to the
quiescent current of the LDO
Maximum input voltage
Current flowing in the V IN pin
with no LDO output current
(LDO quiescent current)
The total power dissipated within the MCP1727 is the
sum of the power dissipated in the LDO pass device
FIGURE 5-1:
PWRGD
Typical Application Circuit.
and the P(I GND ) term. Because of the CMOS
construction, the typical I GND for the MCP1727 is
120 μA. Operating at a maximum of 3.465V results in a
power dissipation of 0.49 milli-Watts. For most
5.1.1 APPLICATION CONDITIONS
Package Type = 3x3DFN8
Input Voltage Range = 3.3V ± 5%
V IN maximum = 3.465V
V IN minimum = 3.135V
V DROPOUT (max) = 0.525V
V OUT (typical) = 2.5V
I OUT = 1.5A maximum
P DISS (typical) = 1.2W
Temperature Rise = 49.2 ° C
5.2 Power Calculations
5.2.1 POWER DISSIPATION
The internal power dissipation within the MCP1727 is a
function of input voltage, output voltage, output current
and quiescent current. Equation 5-1 can be used to
calculate the internal power dissipation for the LDO.
EQUATION 5-1:
P LDO = ( V IN ( MAX ) ) – V OUT ( MIN ) ) × I OUT ( MAX ) )
Where:
applications, this is small compared to the LDO pass
device power dissipation and can be neglected.
The maximum continuous operating junction
temperature specified for the MCP1727 is +125 ° C . To
estimate the internal junction temperature of the
MCP1727, the total internal power dissipation is
multiplied by the thermal resistance from junction to
ambient (R θ JA ) of the device. The thermal resistance
from junction to ambient for the 3x3 DFN package is
estimated at 41 ° C/W.
EQUATION 5-3:
T J ( MAX ) = P TOTAL × R θ JA + T AMAX
T J(MAX) = Maximum continuous junction
temperature
P TOTAL = Total device power dissipation
R θ JA = Thermal resistance from junction to
ambient
T AMAX = Maximum ambient temperature
P LDO
V IN(MAX)
V OUT(MIN)
=
=
=
LDO Pass device internal
power dissipation
Maximum input voltage
LDO minimum output voltage
DS21999B-page 20
? 2007 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP1727T-2502E/MF | 功能描述:低压差稳压器 - LDO 1.5A CMOS LDO 2.5V DFN8 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 |
| MCP1727T-2502E/SN | 功能描述:低压差稳压器 - LDO 1.5A CMOS LDO 2.5V SOIC8 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 |
| MCP1727T-3002E/MF | 功能描述:低压差稳压器 - LDO 1.5A CMOS LDO 3.0V DFN8 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 |
| MCP1727T-3002E/SN | 功能描述:低压差稳压器 - LDO 1.5A CMOS LDO 3.0V SOIC8 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 |
| MCP1727T-3302E/MF | 功能描述:低压差稳压器 - LDO 1.5A CMOS LDO 3.3V DFN8 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 |
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