6

LP5521

SNVS441H – JANUARY 2007 – REVISED MAY 2016

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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

LP5521

UNIT

YFQ (DSBGA)

NJA (WQFN)

20 PINS

24 PINS

Junction-to-ambient thermal resistance

70.7

38.4

°C/W

Junction-to-case (top) thermal resistance

0.5

27.3

°C/W

Junction-to-board thermal resistance

12.1

15.4

°C/W

Junction-to-top characterization parameter

0.2

0.2

°C/W

Junction-to-board characterization parameter

12.0

15.4

°C/W

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

1

(1) (2) (3)

SYMBOL

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

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-

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

Internal oscillator frequency

accuracy

–4%

4%

–7%

7%