TPS54331D datasheet(3/24 Pages) TI

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RECOMMENDED OPERATING CONDITIONS

ELECTRICAL CHARACTERISTICS

TPS54331

www.ti.com ...................................................................................................................................................... SLVS839B – JULY 2008 – REVISED OCTOBER 2008

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

MIN

TYP

MAX

UNIT

Operating Input Voltage on (VIN pin)

3.5

Operating junction temperature, TJ

–40

150

°C

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

Shutdown supply current

EN = 0V, VIN = 12V, –40°C to 85°C

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

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

HIGH-SIDE MOSFET

On resistance

BOOT-PH = 3 V, VIN = 3.5 V

115

200

Ω

BOOT-PH = 6 V, VIN = 12 V

150

ERROR AMPLIFIER

Error amplifier transconductance (gm)

–2

µA < ICOMP < 2 µA, V(COMP) = 1 V

µmhos

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) = 1.0 V, 100 mV overdrive

±7

µA

Switch current to COMP transconductance

VIN = 12 V

A/V

SWITCHING FREQUENCY

TPS54331 Switching Frequency

VIN = 12V, 25°C

456

570

684

kHz

Minimum controllable on time

VIN = 12V, 25°C

105

130

Maximum controllable duty ratio(1)

BOOT-PH = 6 V

PULSE SKIPPING ECO-MODE™

Pulse skipping Eco-mode™ switch current threshold

160

CURRENT LIMIT

Current limit threshold

VIN = 12 V

3.5

5.8

THERMAL SHUTDOWN

Thermal Shutdown

165

°C

SLOW START (SS PIN)

Charge current

V(SS) = 0.4 V

µA

SS to VSENSE matching

V(SS) = 0.4 V

(1)

Specified by design

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