TPS54821 datasheet(4/37 Pages) TI1

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TPS54821

SLVSB14

– OCTOBER 2011

www.ti.com

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

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

Measure at 500 kHz with RT resistor

RT/CLK falling edge to PH rising edge delay

in series

Switching frequency range (RT mode set point

200

1600

kHz

and PLL mode)

PH (PH PIN)

Measured at 90% to 90% of VIN,

Minimum on time

145

°C, IPH = 2A

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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