STLED524 datasheet(13/72 Pages) STMICROELECTRONICS

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STLED524

Electrical characteristics

TSHDN1

Thermal shutdown (boost and

CM)

150

°C

TSHDN1HYST

Hysteresis

TSHDN2

Thermal shutdown (LDO)

170

TSHDN2HYST

Hysteresis

LED current

ILED0-LED23

Current matching

ICOLx = 20 mA, VOUT >

VLED+VCSH

ΔILEDx

Absolute channel accuracy

ICOLx = 20 mA, VOUT >

VLED+VCSH

-7.5

+7.5

VSET

Voltage reference

RSET = 25 k

1.225

1.25

1.275

Current mirror ratio

ILED/ ISET

400

A/A

VCSH

Current source headroom

voltage (COLx to GND)

200

IRIPPLE

LED peak-to-peak current

ripple(2)

VIN = 3.0 V; ILED = 20 mA

in all channels

-15

+15

ILED_MAX

Current mirror max. current

RSET = 20 kΩ

tSET

LED current settling time (current

reaches 90% of the target value)

ICOLx = 20 mA

μs

ICOLx = 1 mA

Logic inputs: MOSI, SCK, SS

VIL

Low-level input voltage

VIO = 1.8 V to 3.6 V

0.3 VIO

VIH

High-level input voltage

VIO = 1.8 V to 3.6 V

0.7 VIO

ILK-H

Input leakage current in high-

level

VIO = 3.6 V

µA

ILK-L

Input leakage current in low-level VIO = 3.6 V

µA

Logic inputs: CLKIN, SYNK, RESET

VIL

Low-level input voltage

VIO = 1.8 V to 3.6 V

0.3 VIO

VIH

High-level input voltage

VIO = 1.8 V to 3.6 V

0.7 VIO

ILK-H

Input leakage current in high-

level

VIO = 3.6 V

µA

ILK-L

Input leakage current in low-level VIO = 3.6 V

µA

Logic outputs

VOL

Low-level output voltage

IOL = 2 mA

0.4

VOH

High-level output voltage

IOH = 2 mA, VIO = 3.0 V

VIO -0.4

Clocks

fOSC

Internal oscillator frequency

VIN = 2.7 V to 5.5 V

540

600

660

kHz

Table 6. Electrical characteristics (continued)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

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