TPS54319

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SLVSA83 – JUNE 2010

THERMAL INFORMATION

TPS54319

UNITS

RTE (16-PINS)

Junction-to-ambient thermal resistance (standard board)

51.7

37.0

Junction-to-top characterization parameter

0.8

Junction-to-board characterization parameter

19.2

°C/W

Junction-to-case(top) thermal resistance

69.3

Junction-to-case(bottom) thermal resistance

6.2

Junction-to-board thermal resistance

22

(1)

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

(2)

distortion starts to substantially increase. See power dissipation estimate in application section of this data sheet for more information.

(3)

Test boards conditions:

(a) 2 inches x 2 inches, 4 layers, thickness: 0.062 inch

(b) 2 oz. copper traces located on the top of the PCB

(c) 2 oz. copper ground planes on the 2 internal layers and bottom layer

(d) 4 thermal vias (10mil) located under the device package

ELECTRICAL CHARACTERISTICS

DESCRIPTION

CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY VOLTAGE (VIN PIN)

Operating input voltage

2.95

6

V

Internal under voltage lockout threshold

2.6

2.8

V

Shutdown supply current

EN = 0 V, 25°C, 2.95 V

≤ VIN ≤ 6 V

2

5

mA

VSENSE = 0.9 V, VIN = 5 V, 25°C, RT = 400 k

Ω

360

575

mA

ENABLE AND UVLO (EN PIN)

Enable threshold

Rising

1.25

V

Falling

1.18

Enable threshold + 50 mV

–4.6

Input current

mA

Enable threshold – 50 mV

–1.2

VOLTAGE REFERENCE (VSENSE PIN)

Voltage Reference

2.95 V

0.802

0.827

0.852

V

MOSFET

BOOT-PH= 5 V

45

81

High side switch resistance

m

Ω

BOOT-PH= 2.95 V

64

110

VIN= 5 V

42

81

Low side switch resistance

m

Ω

VIN= 2.95 V

59

110

ERROR AMPLIFIER

Input current

7

nA

Error amplifier transconductance (gm)

–2 mA < I(COMP) < 2 mA, V(COMP) = 1 V

245

mmhos

Error amplifier transconductance (gm) during

–2 mA < I(COMP) < 2 mA, V(COMP) = 1 V,

79

mmhos

slow start

Vsense = 0.4 V

Error amplifier source/sink

V(COMP) = 1 V, 100 mV overdrive

+20

mA

–20

COMP to Iswitch gm

18

A/V

CURRENT LIMIT

Current limit threshold

3V

4.2

6.6

A

THERMAL SHUTDOWN

Thermal Shutdown

165

°C

Hysteresis

15

°C

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