TPS54319RTE datasheet(4/35 Pages) TI

No. de pieza	TPS54319RTE

Descripción Electrónicos	2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down Switcher With Integrated FETs ( SWIFT??

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Fabricante Electrónico	TI [Texas Instruments]

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TPS54319

SLVSA83 – JUNE 2010

www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

TJ = –40°C to 150°C, VIN = 2.95 to 6 V (unless otherwise noted)

DESCRIPTION

CONDITIONS

MIN

TYP

MAX

UNIT

TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)

Switching frequency range using RT mode

300

2000

kHz

Switching frequency

Rt = 400 k

Ω

400

500

600

kHz

Switching frequency range using CLK mode

300

2000

kHz

Minimum CLK pulse width

75

ns

RT/CLK voltage

R(RT/CLK)= 400k

Ω

0.5

V

RT/CLK high threshold

1.6

2.2

V

RT/CLK low threshold

0.4

0.6

V

RT/CLK falling edge to PH rising edge delay

Measure at 500 kHz with RT resistor in series

90

ns

PLL lock in time

Measure at 500 kHz

14

ms

PH (PH PIN)

Minimum On time

Measured at 50% points on PH, IOUT = 3 A

65

ns

Measured at 50% points on PH, VIN = 5 V,

120

IOUT = 0 A

Minimum Off time

Prior to skipping off pulses, BOOT-PH = 2.95 V,

60

ns

IOUT = 3 A

Rise Time

2.5

VIN = 5 V, 3 A

V/ns

Fall Time

2

BOOT (BOOT PIN)

BOOT Charge Resistance

VIN = 5 V

16

Ω

BOOT-PH UVLO

VIN = 2.95 V

2.2

V

SLOW START AND TRACKING (SS/TR PIN)

Charge Current

V(SS/TR) = 0.4 V

2.2

mA

SS/TR to VSENSE matching

V(SS/TR) = 0.4 V

35

mV

SS/TR to reference crossover

98% normal

1.1

V

SS/TR discharge voltage (Overload)

VSENSE = 0 V

46

mV

SS/TR discharge current (Overload)

VSENSE = 0 V, V(SS/TR) = 0.4 V

325

µA

POWER GOOD (PWRGD PIN)

VSENSE falling (Fault)

91

% Vref

VSENSE rising (Good)

93

% Vref

VSENSE threshold

VSENSE rising (Fault)

107

% Vref

VSENSE falling (Good)

105

% Vref

Hysteresis

VSENSE falling

2

% Vref

Output high leakage

VSENSE = VREF, V(PWRGD) = 5.5 V

2

nA

On resistance

100

200

Ω

Output low

I(PWRGD) = 3.0 mA

0.3

0.6

V

Minimum VIN for valid output

V(PWRGD) < 0.5 V at 100 mA

1.2

1.6

V

4

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TPS54319RTE Datasheet(PDF) 4 Page - Texas Instruments

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