6

LP5521

SNVS441I – JANUARY 2007 – REVISED NOVEMBER 2016

www.ti.com

Product Folder Links: LP5521

Submit Documentation Feedback

Copyright © 2007–2016, Texas Instruments Incorporated

(1)

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

report, SPRA953.

6.4 Thermal Information

THERMAL METRIC(1)

LP5521

UNIT

YFQ (DSBGA)

NJA (WQFN)

20 PINS

24 PINS

RθJA

Junction-to-ambient thermal resistance

70.7

38.4

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

0.5

27.3

°C/W

RθJB

Junction-to-board thermal resistance

12.1

15.4

°C/W

ψJT

Junction-to-top characterization parameter

0.2

0.2

°C/W

ψJB

Junction-to-board characterization parameter

12.0

15.4

°C/W

RθJC(bot)

Junction-to-case (bottom) thermal resistance

n/a

3.1

°C/W

(1)

All voltages are with respect to the potential at the GND pins.

(2)

Minimum and Maximum limits are specified by design, test, or statistical analysis.

(3)

Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.

6.5 Electrical Characteristics

Unless otherwise noted, specifications apply to the LP5521 Functional Block Diagram with: 2.7 V

≤ VDD ≤ 5.5 V, COUT= CIN =

1 μF, CFLY1 = CFLY2 = 0.47 μF; limits are for TJ = 25°C unless specified in the test conditions.

(1) (2) (3)

SYMBOL

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IVDD

Standby supply current

EN = 0 (pin), CHIP_EN = 0 (bit), external 32

kHz clock running or not running

0.2

μA

EN = 0 (pin), CHIP_EN = 0 (bit), external 32-

kHz clock running or not running, –30°C < TA <

85°C

2

EN = 1 (pin), CHIP_EN = 0 (bit), external 32-

kHz clock not running

1

μA

EN = 1 (pin), CHIP_EN = 0 (bit), external 32-

kHz clock running

1.4

μA

Normal mode supply current

Charge pump and LED drivers disabled

0.25

mA

Charge pump in 1x mode, no load, LED drivers

disabled

0.7

mA

Charge pump in 1.5x mode, no load, LED

drivers disabled

1.5

mA

Charge pump in 1x mode, no load, LED drivers

enabled

1.2

mA

Powersave mode supply

current

External 32-kHz clock running

10

μA

Internal oscillator running

0.25

mA

ƒOSC

Internal oscillator frequency

accuracy

–4%

4%

–30°C < TA < 85°C

–7%

7%