TC1303B datasheet(13/30 Pages) MICROCHIP

Part #	TC1303B

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

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Manufacturer	MICROCHIP [Microchip Technology]

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DS21949A-page 13

TC1303B

Note: Unless otherwise indicated, VIN1 = VIN2 = SHDN1,2 = 3.6V, COUT1 =CIN =4.7 µF, COUT2 =1 µF, L =4.7 µH,

VOUT1 (ADJ) = 1.8V, TA = +25°C. Boldface specifications apply over the TA range of -40°C to +85°C. TA = +25°C. Adjustable or fixed

output voltage options can be used to generate the Typical Performance Characteristics.

FIGURE 2-31:

PG Output Voltage Level

Low vs. Ambient Temperature.

FIGURE 2-32:

PG Output Voltage Level

High vs. Ambient Temperature.

FIGURE 2-33:

VOUT2 Power Supply Ripple

Rejection vs. Frequency.

FIGURE 2-34:

VOUT2 Noise vs. Frequency.

FIGURE 2-35:

VOUT1 Load Step Response

vs. Time.

FIGURE 2-36:

VOUT2 Load Step Response

vs. Time.

0.01

0.012

0.014

0.016

0.018

0.02

Ambient Temperature (°C)

VIN = 3.6V

IOL = 1.2 mA

SHDN1 = VIN2

SHDN2 = VIN2

0.0

0.5

1.0

1.5

2.0

2.5

3.0

-40 -25 -10

5

20

35 50

65

80 95 110 125

Ambient Temperature (°C)

VIN = 3.6V

IOH = 500 µA

VOUT2 = 2.8V

VOUT2 = 2.5V

VOUT2 = 1.5V

SHDN1 = VIN2

SHDN2 = VIN2

-80

-70

-60

-50

-40

-30

-20

-10

0

0.01

0.1

1

10

100

1000

Frequency (kHz)

SHDN1 = GND

VOUT2 = 1.5V

IOUT2 = 30 mA

CIN = 0 µF

COUT2 = 1.0 µF

COUT2 = 4.7 µF

0.01

0.1

1

10

0.01

0.1

1

10

100

1000

10000

Frequency (kHz)

SHDN1 = AGND

SHDN2 = VIN2

VIN = 3.6V

VOUT2 = 2.5V

IOUT2 = 50 mA

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