TPS54331-Q1

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SLVSAB5 – NOVEMBER 2010

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

(1)

Maximum power dissipation may be limited by overcurrent protection

(2)

Power rating at a specific ambient temperature TA should be determined with a junction temperature of 150°C. This is the point where

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

Ambient temperature, TA

–40

125

°C

Operating junction temperature, TJ

–40

150

°C

ELECTRICAL CHARACTERISTICS

TJ = –40°C to 150°C, VIN = 3.5V to 28V (unless otherwise noted)

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

mA

Operating – non switching supply current

VSENSE = 0.85 V

110

190

mA

ENABLE AND UVLO (EN PIN)

Enable threshold

Rising and Falling

1.25

1.35

V

Input current

Enable threshold – 50 mV

-1

mA

Input current

Enable threshold + 50 mV

-4

mA

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)

–2 mA < ICOMP < 2 mA, V(COMP) = 1 V

92

mmhos

Error amplifier DC gain(1)

VSENSE = 0.8 V

800

V/V

Error amplifier unity gain bandwidth(1)

5 pF capacitance from COMP to GND pins

2.7

MHz

Error amplifier source/sink current

V(COMP) = 1 V, 100 mV overdrive

±7

mA

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

Maximum controllable duty ratio(1)

BOOT-PH = 6 V

90%

93%

(1)

Specified by design

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