TPS51275B-1RUKR datasheet(5/31 Pages) TI

No de pièce	TPS51275B-1RUKR

Description	TPS51275B-1 Dual Synchronous, Step-Down Controller With 5-V and 3.3-V LDOs

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Fabricant	TI [Texas Instruments]

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TPS51275B-1

www.ti.com

SLVSCT3 – MARCH 2015

7.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN

MAX

UNIT

Supply voltage

VIN

5

24

V

VBST1, VBST2

–0.1

30

VBST1, VBST2(2)

–0.1

5.5

SW1, SW2

–5.5

24

Input voltage(1)

V

EN1, EN2

–0.1

5.5

VFB1, VFB2

–0.1

3.5

VO1

–0.1

5.5

DRVH1, DRVH2

–5.5

30

DRVH1, DRVH2(2)

–0.1

5.5

Output voltage(1)

DRVL1, DRVL2

–0.1

5.5

V

PGOOD, VCLK, VREG5

–0.1

5.5

VREG3, CS1, CS2

–0.1

3.5

Operating free-air temperature, TA

–40

85

°C

(1)

All voltage values are with respect to the network ground terminal unless otherwise noted.

(2)

Voltage values are with respect to the SW terminal.

7.4 Thermal Information

RUK (WQFN)

THERMAL METRIC(1)

UNIT

20 PINS

RθJA

Junction-to-ambient thermal resistance

94.1

RθJC(top)

Junction-to-case (top) thermal resistance

58.1

RθJB

Junction-to-board thermal resistance

64.3

°C/W

ψJT

Junction-to-top characterization parameter

31.8

ψJB

Junction-to-board characterization parameter

58.0

RθJC(bot)

Junction-to-case (bottom) thermal resistance

5.9

(1)

For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

7.5 Electrical Characteristics

over operating free-air temperature range, VVIN = 12 V, VVO1 = 5 V, VVFB1 = VVFB2 = 2 V, VEN1 = VEN2 = 3.3 V (unless otherwise

noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY CURRENT

IVIN1

VIN supply current-1

TA = 25°C, No load, VVO1 = 0 V

860

μA

IVIN2

VIN supply current-2

TA = 25°C, No load

30

μA

IVO1

VO1 supply current

TA = 25°C, No load, VVFB1 = VVFB2 = 2.05 V

900

μA

IVIN(STBY)

VIN stand-by current

TA = 25°C, No load, VVO1 = 0 V, VEN1= VEN2 = 0 V

180

μA

INTERNAL REFERENCE

TA = 25°C

1.99

2

2.01

VFBx

VFB regulation voltage

V

1.98

2

2.02

VREG5 OUTPUT

TA = 25°C, No load, VVO1 = 0 V

4.9

5

5.1

VVIN > 7 V , VVO1 = 0 V, IVREG5 < 100 mA

4.85

5

5.1

VVREG5

VREG5 output voltage

V

VVIN > 5.5 V , VVO1 = 0 V, IVREG5 < 35 mA

4.85

5

5.1

VVIN > 5 V, VVO1 = 0 V, IVREG5 < 20 mA

4.50

4.75

5.1

IVREG5

VREG5 current limit

VVO1 = 0 V, VVREG5 = 4.5 V, VVIN = 7 V

100

150

mA

RV5SW

5-V switch resistance

TA = 25°C, VVO1 = 5 V, IVREG5 = 50 mA

1.8

Ω

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