TPS54821RHLR datasheet(4/37 Pages) TI1

부품명	TPS54821RHLR

상세설명	4.5 V to 17 V Input, 8 A Synchronous Step Down SWIFT??Converter With Hiccup

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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

17

A

Low-side switch sourcing current limit

9.5

11.5

15

A

Low-side switch sinking current limit

2

3

4

A

Hiccup wait time

512

Cycles

Hiccup time before re-start

16384

Cycles

THERMAL SHUTDOWN

Thermal shutdown

160

175

°C

Thermal shutdown hysteresis

10

°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

20

ns

RT/CLK high threshold

2

V

RT/CLK low threshold

0.78

V

Measure at 500 kHz with RT resistor

RT/CLK falling edge to PH rising edge delay

66

ns

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

94

145

ns

25

°C, IPH = 2A

Minimum off time

BOOT-PH

≥ 3 V

0

ns

BOOT (BOOT PIN)

BOOT-PH UVLO

2.1

3

V

SLOW START AND TRACKING (SS/TR PIN)

SS charge current

2.3

μA

SS/TR to VSENSE matching

V(SS/TR) = 0.4 V

20

60

mV

POWER GOOD (PWRGD PIN)

VSENSE threshold

VSENSE falling (Fault)

92

% Vref

VSENSE rising (Good)

94

% Vref

VSENSE rising (Fault)

106

% Vref

VSENSE falling (Good)

104

% Vref

Output high leakage

VSENSE = Vref, V(PWRGD) = 5.5 V

30

100

nA

Output low

I(PWRGD) = 2 mA

0.3

V

Minimum VIN for valid output

V(PWRGD) < 0.5V at 100 μA

0.6

1

V

Minimum SS/TR voltage for PWRGD

1.4

V

4

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