TPS54521 datasheet(5/33 Pages) TI

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TPS54521

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SLVS981 – JUNE 2010

ELECTRICAL CHARACTERISTICS (continued)

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

THERMAL SHUTDOWN

Thermal shutdown

140

150

°C

Thermal shutdown hysteresis

°C

TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)

Minimum switching frequency

Rrt = 240 k

Ω (1%)

160

200

240

kHz

Switching frequency

Rrt = 100 k

Ω (1%)

400

480

560

kHz

Maximum switching frequency

Rrt = 53 k

Ω (1%)

765

900

1035

kHz

Minimum pulse width

RT/CLK high threshold

RT/CLK low threshold

0.8

RT/CLK falling edge to PH rising edge delay

Measure at 500 kHz with RT resistor in series

Switching frequency range (RT mode set point

200

900

kHz

and PLL mode)

PH (PH PIN)

Minimum on time

Measured at 90% to 90% of PH, TA = 25°C, IPH =

135

Minimum off time

BOOT-PH

≥ 3 V

BOOT (BOOT PIN)

BOOT-PH UVLO

2.1

SLOW START AND TRACKING (SS/TR PIN)

SS charge current

2.3

SS/TR to VSENSE matching

V(SS/TR) = 0.4 V

POWER GOOD (PWRGD PIN)

VSENSE falling (Fault)

% Vref

VSENSE rising (Good)

% Vref

VSENSE threshold

VSENSE rising (Fault)

109

% Vref

VSENSE falling (Good)

106

% Vref

Output high leakage

VSENSE = Vref, V(PWRGD) = 5.5 V

100

Output low

I(PWRGD) = 2 mA

0.3

Minimum VIN for valid output

V(PWRGD) < 0.5V at 100 mA

0.6

Minimum SS/TR voltage for PWRGD valid

1.2

1.4

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