TC1303B-1G0EUN datasheet(28/38 Pages) MICROCHIP

Nome de Peças	TC1303B-1G0EUN

Descrição Electrónicos	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output

PDF	38 Pages

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Fabricante Electrônico	MICROCHIP [Microchip Technology]

Página de início	http://www.microchip.com

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28 / 38 page

TC1303A/TC1303B/TC1303C/TC1304

DS21949C-page 28

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

∆IL =(VL/L) x TON =128 mA

Peak inductor current:

IL(PK) =IOUT1+1/2∆IL = 564 mA

Switcher power loss:

Use efficiency estimate for 1.8V from Figure 2-8

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 = 874 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 = 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

θJA = 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.

Nº de peça semelhante - TC1303B-1G0EUN

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Microchip Technology	TC1303B-AA0EMF	601Kb / 30P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2005
	TC1303B-AA0EMF	635Kb / 36P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2005
	TC1303B-AA0EMFTR	601Kb / 30P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2005
	TC1303B-AA0EMFTR	635Kb / 36P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2005
	TC1303B-AA0EUN	601Kb / 30P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2005

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Descrição semelhante - TC1303B-1G0EUN

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Microchip Technology	MCP1601	683Kb / 22P	500 mA Synchronous BUCK Regulator 2003
	TC1303B	601Kb / 30P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2005
	TC1303A	635Kb / 36P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2005
	TC1313	542Kb / 28P	500 mA Synchronous Buck Regulator, 300 mA LDO 2005
	TC1313	621Kb / 32P	500 mA Synchronous Buck Regulator, 300 mA LDO 2009
	MCP1602	464Kb / 26P	2.0 MHz, 500 mA Synchronous Buck Regulator with Power-Good 2007
Texas Instruments	TPS77401-EP	463Kb / 23P	250-mA LDO VOLTAGE REGULATOR WITH POWER-GOOD OUTPUT
Microchip Technology	MCP1601	511Kb / 24P	500 mA Synchronous BUCK Regulator 11/29/12
Rohm	BD4275FP2-C	572Kb / 23P	500 mA Output LDO Regulator with Voltage Detector
Nisshinbo Micro Devices...	RP114X	1Mb / 36P	300 mA LDO REGULATOR

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TC1303B-1G0EUN Folha de dados(PDF) 28 Page - Microchip Technology

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