LP87702 datasheet(6/98 Pages) TI

6 / 98 page

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

MIN

MAX

UNIT

Junction temperature, TJ

−40

140

°C

Ambient temperature, TA

−40

125

°C

6.4 Thermal Information

THERMAL METRIC(1)

RHB (VQFN)

UNIT

32 PINS

RθJA

Junction-to-ambient thermal resistance

31.7

°C/W

RθJCtop

Junction-to-case (top) thermal resistance

17.1

°C/W

RθJB

Junction-to-board thermal resistance

5.6

°C/W

ψJT

Junction-to-top characterization parameter

0.2

°C/W

ψJB

Junction-to-board characterization parameter

5.6

°C/W

RθJCbot

Junction-to-case (bottom) thermal resistance

1.1

°C/W

(1)

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

report.

6.5 Electrical Characteristics

Limits apply over the junction temperature range –40°C ≤ TJ ≤ 140°C, specified VVANA, VVIN_Bx, VVOUT_Bx, VVOUT_BST, and

IOUT range, unless otherwise noted. Typical values are at TA = 25°C, VVANA = VVIN_Bx = 3.3 V, VOUT_BST = 5 V and VOUT_Bx =

1 V, unless otherwise noted. (1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

EXTERNAL COMPONENTS

CIN_BUCK

Input filtering capacitance

for buck converters

Effective capacitance, connected from

VIN_Bx to PGND_Bx

1.9

µF

COUT_BUC

Output filtering

capacitance for buck

converters

Effective total capacitance. Maximum

includes POL capacitance

100

µF

COUT_BUC

K_POL

Point-of-load (POL)

capacitance for buck

converters

Optional POL capacitance

µF

COUT_BST

Output filtering

capacitance for boost

converter

Effective capacitance

µF

ESRC

Input and output

capacitor ESR

[1-10] MHz

mΩ

LBUCK

Inductor for buck

converters

Inductance of the inductor

0.47

µH

–30%

30%

LBST

Inductor for boost

converters

Inductance of the inductor, 2-MHz switching

µH

Inductance of the inductor, 4-MHz switching

Inductance of the inductor

–30%

30%

DCRL

Inductor DCR

mΩ

BUCK CONVERTERS

V(VIN_Bx),

V(VANA)

Input voltage range

2.8

3.3

5.5

VOUT_Bx

Output voltage

Programmable voltage range

0.7

3.36

Step size, 0.7 V ≤ VOUT < 0.73 V

Step size, 0.73 V ≤ VOUT < 1.4 V

Step size, 1.4 V ≤ VOUT ≤ 3.36 V

IOUT_Bx

Output current

3.5 (3)

LP87702

SNVSBU3 – MARCH 2021

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