TPS57114-EP_15 datasheet(7/43 Pages) TI

No. de pieza	TPS57114-EP

Descripción Electrónicos	TPS57114-EP 2.95-V to 6-V Input, 3.5-A Output, 2-MHz, Synchronous Step-Down SWIFT??Converter

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Fabricante Electrónico	TI [Texas Instruments]

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TPS57114-EP

www.ti.com

SLVSCG0 – JULY 2014

Electrical Characteristics (continued)

TJ = –55°C to 150°C, VIN = 2.95 to 6 V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT LIMIT

V(VIN) = 2.95 V, 25°C < TJ < 150°C

5

6.4

TJ = –55°C

4

Current-limit threshold

A

V(VIN) = 6 V, 25°C < TJ < 150°C

4.4

5.56

TJ = –55°C

4

THERMAL SHUTDOWN

Thermal shutdown

168

°C

Hysteresis

20

°C

TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)

Switching frequency range using RT mode

200

2000

kHz

Switching frequency

R(RT/CLK) = 400 kΩ

400

500

600

kHz

Switching frequency range using CLK mode

300

2000

kHz

Minimum CLK pulse duration

80

ns

RT/CLK voltage

R(RT/CLK) = 400 kΩ

0.5

V

RT/CLK high threshold

1.6

2.5

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

42

µs

PH (PH PIN)

Measured at 50% points on PH, IOUT = 3.5 A

75

Minimum on-time

ns

Measured at 50% points on PH, V(VIN) = 6 V,

120

IOUT = 0 A

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

Minimum off-time

60

ns

IOUT = 3.5 A

Rise time

2.25

V(VIN) = 6 V, 3.5 A

V/ns

Fall time

2

BOOT (BOOT PIN)

BOOT charge resistance

V(VIN) = 5 V

16

Ω

BOOT-PH UVLO

V(VIN) = 2.95 V

2.1

V

SLOW START AND TRACKING (SS/TR PIN)

Charge current

V(SS/TR) = 0.4 V

2

µA

SS/TR to VSENSE matching

V(SS/TR) = 0.4 V

54

mV

SS/TR to reference crossover

98% normal

1.1

V

SS/TR discharge voltage (overload)

V(VSENSE) = 0 V

60

mV

SS/TR discharge current (overload)

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

350

µA

SS discharge current (UVLO, EN, thermal fault)

V(VIN) = 5 V, V(SS) = 0.5 V

1.9

mA

POWER-GOOD (PWRGD PIN)

V(VSENSE) falling (fault)

91

V(VSENSE) rising (good)

93

VSENSE threshold

%V(VREF)

V(VSENSE) rising (fault)

109

V(VSENSE) falling (good)

107

Hysteresis

V(VSENSE) falling

2

%V(VREF)

Output high leakage

V(VSENSE) = V(VREF), V(PWRGD) = 5.5 V

7

nA

On-resistance

56

100

Ω

Output low

I(PWRGD) = 3 mA

0.3

V

Minimum VIN for valid output

V(PWRGD) < 0.5 V at 100 µA

0.650

1.5

V

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