6

LP55281

SNVS458D – JUNE 2007 – REVISED OCTOBER 2016

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Copyright © 2007–2016, Texas Instruments Incorporated

(1)

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

6.4 Thermal Information

THERMAL METRIC(1)

LP55281

UNIT

YPG (DSGBA)

YZR (DSGBA)

36 PINS

36 PINS

RθJA

Junction-to-ambient thermal resistance

48.9

49.1

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

0.2

0.2

°C/W

RθJB

Junction-to-board thermal resistance

10.6

10.8

°C/W

ψJT

Junction-to-top characterization parameter

0.1

0.1

°C/W

ψJB

Junction-to-board characterization parameter

10.4

10.6

°C/W

(1)

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

(2)

Minimum (MIN) and maximum (MAX) limits are ensured by design, test or statistical analysis. Typical (TYP) numbers are not ensured,

but do represent the most likely norm.

(3)

Low-ESR surface-mount ceramic capacitors (MLCCs) used in setting electrical characteristics.

(4)

VDDA output is not recommended for external use.

6.5 Electrical Characteristics

Unless otherwise noted, specifications apply to Functional Block Diagram with: VVDD1 = VVDD2 = 3.6 V, VVDDIO = 2.8 V, CV

DD =

CVDDIO = 100 nF, COUT = CIN = 10 µF, CV

DDA= 1 µF, C

REF = 100 nF, L1 = 4.7 µH, RRGB = 8.2 kΩ and RRT = 82 kΩ, and limits are

for TJ = 25°C.

(1) (2) (3).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IVDD

Standby supply current (VDD1

+ VDD2 + leakage to SW, FB,

RGB1-4, ALED)

NSTBY = L

SCK = SS = SI = H

NRST = L

1

µA

NSTBY = L

SCK = SS = SI = H

NRST = L

–30°C < TA < 85°C

10

No-boost supply current

(VDD1 + VDD2)

NSTBY = H, EN_BOOST = L

SCK = SS = SI = H

Audio synchronization and LEDs OFF

350

µA

No-load supply current (VDD1

+ VDD2)

NSTBY = H, EN_BOOST = H, SCK = SS =

SI = H

Audio synchronization and LEDs OFF

Autoload OFF

0.6

mA

Total RGB drivers quiescent

current (VDD1 + VDD2)

EN_RGBx = H

250

µA

ALED driver current (VDD1 +

VDD2)

ALED[7:0] = FFh

180

µA

ALED[7:0] = 00h

0

µA

Audio synchronization

current (VDD1 + VDD2)

Audio synchronization ON

VDD1,2 = 2.8 V

390

µA

Audio synchronization ON

VDD1,2 = 3.6 V

700

µA

IDDIO

VDDIO standby supply current

NSTBY = L

SCK = SS = SI = H

–30°C < TA < 85°C

1

µA

VDDIO supply current

1 MHz SCK frequency in SPI modeCL = 50

pF at SO pin

20

µA

VDDA

Output voltage of internal

LDO for analog parts

See(4)

–3%

2.8

3%

V