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TC1313-AJ2EMF Datasheet(PDF) 19 Page - Microchip Technology

Part No. TC1313-AJ2EMF
Description  500 mA Synchronous Buck Regulator, 300 mA LDO
Download  28 Pages
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC1313-AJ2EMF Datasheet(HTML) 19 Page - Microchip Technology

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© 2005 Microchip Technology Inc.
DS21974A-page 19
TC1313
5.8
Design Example
VOUT1 =2.0V @ 500 mA
VOUT2 =3.3V @ 300 mA
VIN =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
VL =(VIN-VOUT1)= 3V
ΔIL =(VL/L) x TON =128 mA
Peak inductor current:
IL(PK) =IOUT1+1/2ΔIL = 564 mA
Switcher power loss:
Use efficiency estimate for 1.8V from Figure 2-7
Efficiency = 84%, PDISS1 = 190 mW
Resistor Divider:
RTOP = 200 kΩ
RBOT = 133 kΩ
LDO Output:
PDISS2 =(VIN(MAX)
VOUT2(MIN))x IOUT2(MAX)
PDISS2 = (5.5V – (0.975) x 3.3V) x 300 mA
PDISS2 = 684.8 mW
Total
Dissipation = 190 mW + 685 mW = 875 mW
Junction Temp Rise and Maximum Ambient
Operating Temperature Calculations
10-Pin MSOP (4-Layer Board with internal Planes)
R
θJA =113° C/Watt
Junction Temp.
Rise = 875 mW x 113° C/Watt = 98.9°C
Max. Ambient
Temperature = 125°C - 98.9°C
Max. Ambient
Temperature = 26.1°C
10-Pin DFN
R
θJA = 41° C/Watt (4-Layer Board with
internal planes and 2 vias)
Junction Temp.
Rise = 875 mW x 41° C/Watt = 35.9°C
Max. Ambient
Temperature = 125°C - 35.9°C
Max. Ambient
Temperature = 89.1°C
This is above the +85°C max. ambient temperature.


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