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| 型号： | MCP1603-250I/MC |
| 厂商： | Microchip Technology |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 2.5V 0.5A 8DFN |
| 标准包装： | 150 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 2.5V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 是 |
| 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 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN（3x2） |
| 配用： | MCP1603RD-TNY-ND - REFERENCE DESIGN FOR MCP1603 MCP1603EV-ND - BOARD EVAL BUCK CONV MCP1603 |
MCP1603
capacitor value.
TABLE 5-2:
MCP1603 RECOMMENDED
INDUCTORS
TABLE 5-1:
Minimum
Maximum
CAPACITOR VALUE RANGE
C IN C OUT
4.7 μF 4.7 μF
— 22 μF
Part
Number
Coiltronics ?
SD3110
Value
(μH)
3.3
DCR
Ω
(max)
0.195
I SAT
(A)
0.81
Size
WxLxH (mm)
3.1x3.1x1.0
5.6
Inductor Selection
SD3110
4.7
0.285
0.68
3.1x3.1x1.0
When using the MCP1603, the inductance value can
range from 3.3 μH to 10 μH. An inductance value of
4.7 μH is recommended to achieve a good balance
SD3110
SD3812
SD3812
6.8
3.3
4.7
0.346
0.159
0.256
0.58
1.40
1.13
3.1x3.1x1.0
3.8x3.8x1.2
3.8x3.8x1.2
between converter load transient response and mini-
mized noise.
The value of inductance is selected to achieve a
desired amount of ripple current. It is reasonable to
assume a ripple current that is 20% of the maximum
load current. The larger the amount of ripple current
allowed, the larger the output capacitor value becomes
SD3812 6.8
Würth Elektronik ?
WE-TPC 3.3
Type XS
WE-TPC 4.7
Type XS
0.299
0.225
0.290
0.95
0.72
0.50
3.8x3.8x1.2
3.3x3.5x0.95
3.3x3.5x0.95
to meet ripple voltage specifications. The inductor
WE-TPC
4.7
0.105
0.90
3.8x3.8x1.65
ripple current can be calculated according to the follow-
Type S
ing equation.
WE-TPC
6.8
0.156
0.75
3.8x3.8x1.65
EQUATION 5-4:
Type S
Sumida ?
Δ I L = ------------------- × ? ? ? ?
V OUT V OUT
F SW × L
Where:
1 – -------------
V IN
CMD4D06
CMD4D06
CMD4D06
3.3
4.7
6.8
0.174
0.216
0.296
0.77
0.75
0.62
3.5x4.3x0.8
3.5x4.3x0.8
3.5x4.3x0.8
F SW = Switching Frequency
5.7
Thermal Calculations
The MCP1603 is available in two different packages
When considering inductor ratings, the maximum DC
current rating of the inductor should be at least equal to
the maximum load current, plus one half the peak-to-
peak inductor ripple current (1/2 * Δ I L ). The inductor DC
resistance adds to the total converter power loss. An
inductor with a low DC resistance allows for higher
converter efficiency.
(TSOT-23 and 2x3 DFN). By calculating the power
dissipation and applying the package thermal
resistance, ( θ JA ), the junction temperature is
estimated. The maximum continuous junction
temperature rating for the MCP1603 is +125°C.
To quickly estimate the internal power dissipation for
the switching buck regulator, an empirical calculation
using measured efficiency can be used. Given the
measured efficiency, the internal power dissipation is
estimated by:
EQUATION 5-5:
? ------------------------------ ? – ( V
? Efficiency ?
OUT × I OUT ) = P Diss
The difference between the first term, input power
dissipation, and the second term, power delivered, is
the internal power dissipation. This is an estimate
assuming that most of the power lost is internal to the
MCP1603. There is some percentage of power lost in
the buck inductor, with very little loss in the input and
output capacitors.
? 2007 Microchip Technology Inc.
DS22042A-page 15
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