TC1303B-AQ1EMF datasheet(20/30 Pages) MICROCHIP

部件名	TC1303B-AQ1EMF

功能描述	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output

Download	30 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

标志

20 / 30 page

TC1303B

DS21949A-page 20

As an example, for a 3.6V input, 1.8V output with a load

of 400 mA, the efficiency taken from Figure 2-7 is

approximately 84%. The internal power dissipation is

approximately 171 mW.

5.6.2

LDO OUTPUT (VOUT2)

The internal power dissipation within the TC1303B

LDO is a function of input voltage, output voltage and

output current. The following equation can be used to

calculate the internal power dissipation for the LDO.

EQUATION 5-7:

The maximum power dissipation capability for a

package can be calculated given the junction-to-

ambient thermal resistance and the maximum ambient

temperature for the application. The following equation

can be used to determine the package’s maximum

internal power dissipation.

5.6.3

LDO POWER DISSIPATION

EXAMPLE

5.7

PCB Layout Information

Some basic design guidelines should be used when

physically placing the TC1303B on a Printed Circuit

Board (PCB). The TC1303B has two ground pins, iden-

tified as AGND (analog ground) and PGND (power

ground). By separating grounds, it is possible to

minimize the switching frequency noise on the LDO

output. The first priority, while placing external compo-

nents on the board, is the input capacitor (CIN1). Wiring

should be short and wide; the input current for the

TC1303B can be as high as 800 mA. The next priority

would be the buck regulator output capacitor (COUT1)

and inductor (L1). All three of these components are

placed near their respective pins to minimize trace

length. The CIN1 and COUT1 capacitor returns are con-

nected closely together at the PGND plane. The LDO

optional input capacitor (CIN2) and LDO output capaci-

tor COUT2 are returned to the AGND plane. The analog

ground plane and power ground plane are connected

at one point (shown near L1). All other signals (SHDN1,

SHDN2, feedback in the adjustable output case)

should be referenced to AGND and have the AGND

plane underneath them.

FIGURE 5-1:

Component Placement,

Fixed 10-Pin MSOP.

There will be some difference in layout for the 10-pin

DFN package due to the thermal pad. A typical fixed-

output DFN layout is shown below. For the DFN layout,

the VIN1 to VIN2 connection is routed on the bottom of

the board around the TC1303B thermal pad.

FIGURE 5-2:

Component Placement,

Fixed 10-Pin DFN.

Input Voltage

VIN =5V±10%

LDO Output Voltage and Current

VOUT =3.3V

IOUT =300 mA

Internal Power Dissipation

PLDO(MAX) =(VIN(MAX) – VOUT(MIN)) x IOUT(MAX)

PLDO = (5.5V) – (0.975 x 3.3V))

x 300 mA

PLDO =684.8 mW

P

LDO

V

IN MAX

)

() VOUT2 MIN

()

–

() I

OUT2 MAX

)

()

×

=

Where:

PLDO

= LDO Pass device internal

power dissipation

VIN(MAX) = Maximum input voltage

VOUT(MIN)= LDO minimum output voltage

TC1303B

1

2

6

8

7

9

10

5

4

3

+VOUT1

PGND

+VIN1

AGND

+VOUT2

COUT1

CIN2

COUT2

CIN1

PGND Plane

AGND Plane

L1

AGND to PGND

+VIN2

* CIN2 Optional

- Via

1

2

6

8

7

9

10

5

4

3

+VOUT1

PGND

+VIN1

AGND

+VOUT2

COUT1

CIN2

COUT2

CIN1

PGND Plane

AGND Plane

L1

AGND to PGND

PGND

* CIN2 Optional

+VIN2

TC1303B

- Via

类似零件编号 - TC1303B-AQ1EMF

制造商	部件名	数据表	功能描述
Microchip Technology	TC1303B-AQ1EMF	635Kb / 36P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2005
Microchip Technology	TC1303B-AQ1EMFTR	635Kb / 36P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2005

More results

类似说明 - TC1303B-AQ1EMF

制造商	部件名	数据表	功能描述
Microchip Technology	TC1303A	791Kb / 38P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2008
	TC1303A	635Kb / 36P	500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output 2005
	TC1313	621Kb / 32P	500 mA Synchronous Buck Regulator, 300 mA LDO 2009
	TC1313	542Kb / 28P	500 mA Synchronous Buck Regulator, 300 mA LDO 2005
	MCP1602	464Kb / 26P	2.0 MHz, 500 mA Synchronous Buck Regulator with Power-Good 2007
	MCP1601	683Kb / 22P	500 mA Synchronous BUCK Regulator 2003
	MCP1601	511Kb / 24P	500 mA Synchronous BUCK Regulator 11/29/12
Texas Instruments	TPS77401-EP	463Kb / 23P	[Old version datasheet] 250-mA LDO VOLTAGE REGULATOR WITH POWER-GOOD OUTPUT
Nisshinbo Micro Devices...	RP114X	1Mb / 36P	300 mA LDO REGULATOR
Rohm	BD4275FP2-C	572Kb / 23P	500 mA Output LDO Regulator with Voltage Detector