PACKAGE DISSIPATION RATINGS

(1) (2) (3)

ELECTRICAL CHARACTERISTICS

TPS54620

THERMAL IMPEDANCE

ψ

PACKAGE

JUNCTION TO AMBIENT

JUNCTION TO TOP

RGY

32°C/W

5°C/W

(1)

Maximum power dissipation may be limited by overcurrent protection

(2)

distortion starts to substantially increase. Thermal management of the PCB should strive to keep the junction temperature at or below

150°C for best performance and long-term reliability. See power dissipation estimate in application section of this data sheet for more

information.

(3)

Test board conditions:

a. 2.5 inches × 2.5 inches, 4 layers, thickness: 0.062 inch

b. 2 oz. copper traces located on the top of the PCB

c. 2 oz. copper ground planes on the 2 internal layers and bottom layer

d. 4 thermal vias located under the device package

DESCRIPTION

CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY VOLTAGE (VIN AND PVIN PINS)

PVIN operating input voltage

1.6

17

V

VIN operating input voltage

4.5

17

V

VIN internal UVLO threshold

VIN rising

4.0

4.5

V

VIN internal UVLO hysterisis

150

mV

VIN shutdown supply Current

EN = 0 V

2

5

µA

VIN operating – non switching supply current

VSENSE = 810 mV

600

800

µA

ENABLE AND UVLO (EN PIN)

Enable threshold

Rising

1.21

1.26

V

Enable threshold

Falling

1.10

1.17

Input current

EN = 1.1 V

1.15

µA

Hysteresis current

EN = 1.3 V

3.4

µA

VOLTAGE REFERENCE

Voltage reference

0 A

≤ Iout ≤ 6 A

0.792

0.800

0.808

V

MOSFET

High-side switch resistance

BOOT-PH = 3 V

32

60

m

Ω

BOOT-PH = 6 V

26

40

m

Ω

VIN = 12 V

19

30

m

Ω

ERROR AMPLIFIER

Error amplifier Transconductance (gm)

–2

µA < ICOMP < 2 µA, V(COMP) = 1 V

1300

µMhos

Error amplifier dc gain

VSENSE = 0.8 V

1000

3100

V/V

Error amplifier source/sink

V(COMP) = 1 V, 100 mV input overdrive

±110

µA

Start switching threshold

0.25

V

COMP to Iswitch gm

16

A/V

CURRENT LIMIT

High-side switch current limit threshold

8

11

A

Low-side switch sourcing current limit

7

10

A

Low-side switch sinking current limit

2.3

A

(1)

Measured at pins

Copyright © 2009, Texas Instruments Incorporated

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