TPS54335A_15 datasheet(5/46 Pages) TI

Part #	TPS54335A

Description	TPS5433xA 4.5- to 28-V Input, 3-A Output, Synchronous SWIFT??Step-Down DC-DC Converter

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Manufacturer	TI [Texas Instruments]

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TPS54335A, TPS54335-1A, TPS54336A

www.ti.com

SLVSCD5C – NOVEMBER 2014 – REVISED JULY 2015

7.4 Thermal Information

TPS5433xA

TPS5433xA and

TPS54335-1A

THERMAL METRIC(1)

UNIT

DDA (SO PowerPAD)

DRC (VSON)

8 PINS

10 PINS

RθJA

Junction-to-ambient thermal resistance

42.1

43.9

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

50.9

55.4

°C/W

RθJB

Junction-to-board thermal resistance

31.8

18.9

°C/W

ψJT

Junction-to-top characterization parameter

8

0.7

°C/W

ψJB

Junction-to-board characterization parameter

13.5

19.1

°C/W

RθJC(bot)

Junction-to-case (bottom) thermal resistance

7.1

5.3

°C/W

(1)

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

7.5 Electrical Characteristics

The electrical ratings specified in this section apply to all specifications in this document unless otherwise noted. These

specifications are interpreted as conditions that will not degrade the parametric or functional specifications of the device for

the life of the product containing it. TJ = –40°C to 150°C, VIN = 4.5 to 28 V, (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY VOLTAGE AND UVLO (VIN PIN)

Operating input voltage

4.5

28

V

Input UVLO threshold

Rising VIN

4

4.5

V

Input UVLO hysteresis

180

400

mV

VIN-shutdown supply current

VEN = 0 V

2

10

µA

VIN-operating non-switching supply

VVSENSE = 810 mV

310

800

µA

current

ENABLE (EN PIN)

Enable threshold

Rising

1.21

1.28

V

Enable threshold

Falling

1.1

1.17

V

Input current

VEN = 1.1 V

1.15

µA

Hysteresis current

VEN = 1.3 V

3.3

µA

VOLTAGE REFERENCE

TJ =25°C

0.7936

0.8 0.8064

Reference

V

0.788

0.8

0.812

MOSFET

V(BOOT-PH) = 3 V

160

280

m

Ω

High-side switch resistance(1)

V(BOOT-PH) = 6 V

128

230

m

Ω

Low-side switch resistance(1)

VIN = 12 V

84

170

m

Ω

ERROR AMPLIFIER

Error-amplifier transconductance (gm)

–2 µA < ICOMP < 2 µA, VCOMP = 1 V

1300

µmhos

Error-amplifier source and sink

VCOMP = 1 V, 100-mV overdrive

100

µA

Start switching peak current threshold

0.5

A

COMP to ISWITCH gm

8

A/V

CURRENT-LIMIT

High-side switch current-limit threshold

4

4.9

6.5

A

Low-side switch sourcing current-limit

3.5

4.7

6.1

A

Low-side switch sinking current-limit

0

A

(1)

Measured at pins

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Product Folder Links: TPS54335A TPS54335-1A TPS54336A

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