TPS54821 datasheet(6/42 Pages) TI2

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TPS54821

SLVSB14B – OCTOBER 2011 – REVISED FEBRUARY 2016

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Electrical Characteristics (continued)

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

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT LIMIT

High-side switch current limit threshold

10.5

14.5

Low-side switch sourcing current limit

9.5

11.5

Low-side switch sinking current limit

Hiccup wait time

512

Cycles

Hiccup time before re-start

16384

Cycles

THERMAL SHUTDOWN

Thermal shutdown

160

175

°C

Thermal shutdown hysteresis

°C

Thermal shutdown hiccup time

16384

Cycles

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 = 29 k

Ω (1%)

1440

1600

1760

kHz

Minimum pulse width

RT/CLK high threshold

RT/CLK low threshold

0.78

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 and

PLL mode)

200

1600

kHz

PH (PH PIN)

Minimum on time

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

145

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

μA

SS/TR to VSENSE matching

V(SS/TR) = 0.4 V

POWER GOOD (PWRGD PIN)

VSENSE threshold

VSENSE falling (Fault)

% Vref

VSENSE rising (Good)

% Vref

VSENSE rising (Fault)

106

% Vref

VSENSE falling (Good)

104

% 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 μA

0.6

Minimum SS/TR voltage for PWRGD

1.4

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