6.4 Thermal Information

THERMAL METRIC(1)

TPSM8281x

UNIT

SIE (14 PINS)

VCA (13 PINS)

JEDEC 51-5

EVM

JEDEC 51-7

EVM

RθJA

Junction-to-ambient thermal resistance

45.3

32.2

72.1

26.6

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

29

n/a (2)

37.2

n/a (2)

°C/W

RθJB

Junction-to-board thermal resistance

27.4

n/a (2)

21.2

n/a (2)

°C/W

ΨJT

Junction-to-top characterization parameter

5.7

7.2

(-0.4)(3)

(-1.9)(3)

°C/W

ΨJB

Junction-to-board characterization parameter

16.2

12.7

20.8

10.1

°C/W

(1)

For more information about thermal metrics, see the Semiconductor and IC Package Thermal Metrics application note.

(2)

Not applicable to an EVM.

(3)

The junction temperature is lower than the inductor temperature leading to a temperature increase towards the top of the package

6.5 Electrical Characteristics

Over operating junction remperature range (TJ = –40°C to +125°C) and VIN = 2.7 V to 6 V. Typical values at VIN = 5 V and TJ

= 25°C. (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY

IQ

Quiescent current

EN = High, no load, device not switching,

MODE/SYNC = GND, VOUT = 0.6 V

18

36

μA

ISD

Shutdown current

EN = GND

0.15

90

μA

VUVLO

Undervoltage lockout threshold

VIN rising

2.45

2.6

2.7

V

VIN falling

2.1

2.5

2.6

V

TJSD

Thermal shutdown threshold

TJ rising

180

°C

Thermal shutdown hysteresis

TJ falling

15

°C

CONTROL and INTERFACE

VIH,EN

Input threshold voltage

EN rising

1.05

1.1

1.15

V

VIL,EN

Input threshold voltage

EN falling

0.96

1.0

1.05

V

IIH,EN

Input leakage current into EN

EN = VIN or GND

125

nA

VIH

Input-threshold voltage at MODE/SYNC

1.1

V

VIL

Input-threshold voltage at MODE/SYNC

0.3

V

IIH

Input leakage current into MODE/SYNC

250

nA

fSW

PWM switching frequency range

MODE/SYNC = high

1.8

2.25

4

MHz

fSW

PWM switching frequency

COMP/FSET = GND or VIN

2.08

2.25

2.4

MHz

fSW

PWM switching frequency tolerance

using a resistor from COMP/FSET to

GND

–12%

12%

fSYNC

Frequency range on MODE/SYNC pin for

synchronization

1.8

4

MHz

tSync_lock Time to lock to external frequency

50

µs

Duty cycle of synchronization signal at

MODE/SYNC

20%

80%

tDelay

Enable delay time

Time from EN high to device starts

switching; VIN applied already

135

270

520

µs

tRamp

Output voltage ramp time, SS/TR pin

open

IOUT = 0 mA, time from device starts

switching to power good; device not in

current limit

90

150

220

µs

ISS/TR

SS/TR source current

8

10

12

µA

RDIS,SS/T

R

Internal discharge resistance on SS/TR

EN = low

0.7

1.1

1.5

kΩ

Tracking gain

VFB / VSS/TR

1

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TPSM82816

SLUSEY7A – DECEMBER 2022 – REVISED JUNE 2024

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