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參數(shù)資料
| 型號： | TC1303A-AR3EMFTR |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| 中文描述： | 500毫安同步降壓穩(wěn)壓器，300 mA的LDO具有電源就緒輸出 |
| 文件頁數(shù)： | 26/36頁 |
| 文件大?。?/td> | 463K |
| 代理商： | TC1303A-AR3EMFTR |
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TC1303A/TC1303B/TC1303C/TC1304
DS21949B-page 26
2005 Microchip Technology Inc.
5.8
Design Example
V
OUT1
= 2.0V @ 500 mA
V
OUT2
= 3.3V @ 300 mA
V
IN
= 5V±10%
L = 4.7μH
Calculate PWM mode inductor ripple current
Nominal Duty
Cycle = 2.0V/5.0V = 40%
P-channel
Switch-on time = 0.40 x 1/(2 MHz) = 200 ns
V
L
= (V
IN
-V
OUT1
) = 3V
Δ
I
L
= (V
L
/L) x T
ON
= 128 mA
Peak inductor current:
I
L(PK)
= I
OUT1
+1/2
Δ
I
L
= 564 mA
Switcher power loss:
Use efficiency estimate for 1.8V from Figure 2-8
Efficiency = 84%, P
DISS1
= 190 mW
Resistor Divider:
R
TOP
= 200 k
Ω
R
BOT
= 133 k
Ω
LDO Output:
P
DISS2
= (V
IN(MAX)
–
V
OUT2(MIN)
) x I
OUT2(MAX)
P
DISS2
= (5.5V – (0.975) x 3.3V) x 300 mA
P
DISS2
= 684.8 mW
Total
Dissipation = 190 mW + 685 mW = 874 mW
Junction Temp Rise and Maximum Ambient
Operating Temperature Calculations
10-Pin MSOP
(4-Layer Board with internal Planes)
R
θ
JA
= 113° C/Watt
Junction Temp.
Rise = 874 mW x 113° C/Watt = 98.8°C
Max. Ambient
Temperature = 125°C - 98.8°C
Max. Ambient
Temperature = 26.3°C
10-Pin DFN
R
θ
JA
= 41° C/Watt (4-Layer Board with
internal planes and 2 vias)
Junction Temp.
Rise = 874 mW x 41° C/Watt = 35.8°C
Max. Ambient
Temperature = 125°C - 35.8°C
Max. Ambient
Temperature = 89.2°C
This is above the +85°C max. ambient temperature.
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| TC1303A-AS0EMF | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1303A-AR3EUN | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AR3EUNTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AS0EMF | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AS0EMFTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303A-AS0EUN | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
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