TPS54521 datasheet(4/33 Pages) TI

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TPS54521

SLVS981 – JUNE 2010

www.ti.com

ELECTRICAL CHARACTERISTICS

TJ= –40°C to 125°C, VIN = 4.5V to 17V, PVIN = 1.6V to 17V (unless otherwise noted)

DESCRIPTION

CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY VOLTAGE (VIN AND PVIN PINS)

PVIN operating input voltage

1.6

VIN operating input voltage

4.5

VIN internal UVLO threshold

VIN rising

4.0

4.5

VIN internal UVLO hysteresis

150

VIN shutdown supply Current

EN = 0 V

VIN operating – non switching supply current

VSENSE = 810 mV

600

800

ENABLE AND UVLO (EN PIN)

Enable threshold

Rising

1.21

1.26

Enable threshold

Falling

1.10

1.17

Input current

EN = 1.1 V

1.15

Hysteresis current

EN = 1.3 V

3.4

VOLTAGE REFERENCE

Voltage reference

0 A

≤ Iout ≤ 5 A

0.776

0.800

0.824

MOSFET

High-side switch resistance(1)

BOOT-PH = 3 V

105

Ω

High-side switch resistance(1)

BOOT-PH = 6 V

Ω

Low-side Switch Resistance(1)

VIN = 12 V

Ω

ERROR AMPLIFIER

Error amplifier Transconductance (gm)

–2 mA < ICOMP < 2 mA, V(COMP) = 1 V

1300

mMhos

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

Start switching threshold

0.25

COMP to Iswitch gm

A/V

CURRENT LIMIT

High-side switch current limit threshold

Low-side switch sourcing current limit

Low-side switch sinking current limit

2.6

Hiccup wait time before triggering hiccup

512

cycles

Hiccup time before restart

16384

cycles

(1)

Measured at pins

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