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| 型号： | MCP1624T-I/MC |
| 厂商： | Microchip Technology |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC BOOST SYNC REG PWM/PFM 8DFN |
| 标准包装： | 3,300 |
| 应用： | 转换器，PIC? 微控制器 |
| 输入电压： | 0.8 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（2x3） |
| 包装： | 带卷 (TR) |
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MCP1623/24
5.5
Inductor Selection
Peak current is the maximum or limit, and saturation
The MCP1623/24 is designed to be used with small
surface mount inductors; the inductance value can
range from 2.2 μH to 10 μH. An inductance value of
4.7 μH is recommended to achieve a good balance
between inductor size, converter load transient
response and minimized noise.
current typically specifies a point at which the
inductance has rolled off a percentage of the rated
value. This can range from a 20% to 40% reduction in
inductance. As inductance rolls off, the inductor ripple
current increases as does the peak switch current. It is
important to keep the inductance from rolling off too
much, causing switch current to reach the peak limit.
TABLE 5-2:
MCP1623/24 RECOMMENDED
INDUCTORS
5.6
Thermal Calculations
Part
Number
Value
(μH)
DCR
Ω (typ)
I SAT
(A)
Size
WxLxH (mm)
By calculating the power dissipation and applying the
package thermal resistance, ( θ JA ), the junction
Coilcraft ?
temperature is estimated. The maximum continuous
junction temperature rating for the MCP1623/24 is
ME3220
LPS3015
EPL3012
XPL2010
Coiltronics ?
SD3110
SD3112
SD3114
4.7
4.7
4.7
4.7
4.7
4.7
4.7
0.190
0.200
0.165
0.336
0.285
0.246
0.251
1.5
1.2
1.0
0.75
0.68
0.80
1.14
2.5x3.2x2.0
3.0x3.0x1.5
3.0x3.0x1.3
1.9x2.0x1.0
3.1x3.1x1.0
3.1x3.1x1.2
3.1x3.1x1.4
+125 o C.
To quickly estimate the internal power dissipation for
the switching boost regulator, an empirical calculation
using measured efficiency can be used. Given the
measured efficiency, the internal power dissipation is
EQUATION 5-3:
? ------------------------------- ? – ( V
Part
Number
Value
(μH)
DCR
Ω
(max)
I SAT
(A)
Size
WxLxH (mm)
V OUT × I OUT
? Efficiency ?
OUT × I OUT ) = P Dis
Wurth Elektronik ?
WE-TPC
Type TH
WE-TPC
4.7
4.7
0.200
0.105
0.8
0.90
2.8x2.8x1.35
3.8x3.8x1.65
The difference between the first term, input power, and
the second term, power delivered, is the internal
MCP1623/24 power dissipation. This is an estimate
Type S
assuming that most of the power lost is internal to the
WE-TPC
4.7
0.082
1.65
4.8x4.8x1.8
MCP1623/24 and not C IN , C OUT and the inductor.
Type M
There is some percentage of power lost in the boost
Part
Number
Value
(μH)
DCR
Ω
(max)
I SAT
(A)
Size
WxLxH (mm)
inductor, with very little loss in the input and output
capacitors. For a more accurate estimation of internal
power dissipation, subtract the I INRMS2 *L ESR power
dissipation.
Sumida ?
CMH23
CMD4D06
CDRH4D
4.7
4.7
4.7
0.537
0.216
0.09
0.70
0.75
0.800
2.3x2.3x1.0
3.5x4.3x0.8
4.6x4.6x1.5
EPCOS ?
B82462A2
4.7
0.084
2.00
6.0x6.0x2.5
472M000
B82462G4
4.7
0.04
1.8
6.3x6.3x3.0
472M
Several parameters are used to select the correct
inductor: maximum rated current, saturation current
and copper resistance (ESR). For boost converters, the
inductor current can be much higher than the output
current. The lower the inductor ESR, the higher the
efficiency of the converter, a common trade-off in size
versus efficiency.
DS41420C-page 14
? 2011 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP16251 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low Quiescent Current, PFM/PWM Synchronous Boost Regulator |
| MCP16251T-I/CH | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MCP16251T-I/MNY | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MCP16252 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low Quiescent Current, PFM/PWM Synchronous Boost Regulator |
| MCP16252T-I/CH | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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