TPS56221

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SLUSAH5C – MARCH 2011 – REVISED JANUARY 2015

6.4 Thermal Information

TPS56221

PQFN

UNIT

22 PINS

Junction-to-ambient thermal resistance

34.6

Junction-to-case (top) thermal resistance

22.9

Junction-to-top characterization parameter

0.6

°C/W

Junction-to-board characterization parameter

5.0

Junction-to-case (bottom) thermal resistance

0.3

(1)

For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

–40°C

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOLTAGE REFERENCE

597

600

603

FB input voltage

mV

–40°C

594

600

606

4.5 V

INPUT SUPPLY

Input supply voltage range

4.5

14

V

Shutdown supply current

80

120

µA

Quiescent, nonswitching

2.5

5.0

mA

UVLO ON Voltage

4.0

4.3

V

UVLO hysteresis

500

700

mV

ENABLE/SOFT-START

High-level input voltage, EN/SS

0.55

0.70

1.00

V

Low-level input voltage, EN/SS

0.27

0.30

0.33

V

Soft-start source current

8

10

12

µA

Soft-start voltage level – start of

0.4

0.8

1.3

V

ramp

BP REGULATOR

Output voltage

6.2

6.5

6.8

V

70

125

mV

OSCILLATOR

270

300

330

kHz

4.5 V

Switching frequency

450

500

550

kHz

4.5 V

0.8

0.95

1.1

MHz

4.5 V

(1)

Ramp amplitude

V

PWM

93%

4.5 V

(1)

Maximum duty cycle

90%

4.5 V

85%

4.5 V

(1)

Minimum controllable pulse width

100

ns

ERROR AMPLIFIER

(1)

Ensured by design. Not production tested

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