TPS54331

www.ti.com

SLVS839D

– JULY 2008 – REVISED JANUARY 2012

PACKAGE DISSIPATION RATINGS

(1) (2) (3)

THERMAL IMPEDANCE

PSEUDO THERMAL IMPEDANCE

PACKAGE

JUNCTION TO AMBIENT

JUNCTION TO TOP

SOIC8

100

°C/W

5

°C/W

SOIC8 PowerPAD

™

50

°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 inches x 1.5 inches, 2 layers, thickness: 0.062 inch

(b) 2-ounce copper traces located on the top and bottom of the PCB

(c) 6 thermal vias located under the device package

RECOMMENDED OPERATING CONDITIONS

over operating free-air temperature range (unless otherwise noted)

MIN

TYP

MAX

UNIT

Operating Input Voltage on (VIN pin)

3.5

28

V

–40

150

°C

ELECTRICAL CHARACTERISTICS

DESCRIPTION

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY VOLTAGE (VIN PIN)

Internal undervoltage lockout threshold

Rising and Falling

3.5

V

Shutdown supply current

EN = 0V, VIN = 12V,

–40°C to 85°C

1

4

μA

Operating

– non switching supply current

VSENSE = 0.85 V

110

190

μA

ENABLE AND UVLO (EN PIN)

Enable threshold

Rising and Falling

1.25

1.35

V

Input current

Enable threshold

– 50 mV

-1

μA

Input current

Enable threshold + 50 mV

-4

μA

VOLTAGE REFERENCE

Voltage reference

0.772

0.8

0.828

V

HIGH-SIDE MOSFET

BOOT-PH = 3 V, VIN = 3.5 V

115

200

m

Ω

On resistance

BOOT-PH = 6 V, VIN = 12 V

80

150

ERROR AMPLIFIER

Error amplifier transconductance (gm)

92

μmhos

VSENSE = 0.8 V

800

V/V

5 pF capacitance from COMP to GND pins

2.7

MHz

Error amplifier source/sink current

±7

μA

Switch current to COMP transconductance

VIN = 12 V

12

A/V

SWITCHING FREQUENCY

Switching Frequency

VIN = 12V, 25

°C

456

570

684

kHz

Minimum controllable on time

VIN = 12V, 25

°C

105

130

ns

BOOT-PH = 6 V

90%

93%

PULSE SKIPPING ECO-MODE

™

Pulse skipping Eco-mode

™ switch current threshold

160

mA

CURRENT LIMIT

Current limit threshold

VIN = 12 V

3.5

5.8

A

(1)

Specified by design

Copyright

© 2008–2012, Texas Instruments Incorporated

3