stcs44pqr STMicroelectronics, stcs44pqr Datasheet

stcs44pqr

Manufacturer Part Number

stcs44pqr

Description

4-channel Current Source For High Power White Leds

Manufacturer

STMicroelectronics

Datasheet

1.STCS44PQR.pdf (6 pages)

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Features

■

Applications

■

Description

The STCS44 is a dedicated and space optimized

solution for controlling the current of high power

white LEDs in camera phones, PDAs and other

hand-held devices.

It is capable of controlling the current of 4

independent white LEDs with a maximum current

of 2.5 A each using linear control. However at 10

A of total current, the power dissipation reaches

very high values. Therefore, the operation of the

device must be limited to a short period of time.

Table 1.

March 2009

For further information contact your local STMicroelectronics sales office.

Input voltage range from 2.7 V to 5.5 V

4 current sources drive 4 LEDs up to 2.5 A

each

Separate current regulation for each channel

Operational modes:

– Standby mode

– Flash mode: up to 10 A total

Total flash current adjustable from 1 A to 10 A

10% current accuracy

LED short-circuit detection and protection

Chip overtemperature detection and protection

High-end cell phones and smart phones

High power camera flashe using SuperCap

technology

PDAs and digital still cameras

High brightness white LEDs

STCS44PQR

Order code

Device summary

4-channel current source for high power white LEDs

QFN16 (3 x 3 mm.)

Package

Rev 1

This makes the device specifically suitable for

flash light applications. Continuous current control

can be maintained if the power dissipation limit is

not exceeded.

The operation is based on closed loop

architecture capable of comparing the voltage of a

sensing resistor to an external voltage reference.

This ensures good current regulation over the

forward voltage spread characteristics of the flash

LEDs.

It includes several functions to protect the chip

and the power LEDs. These include chip

overtemperature detection and protection,

shorted LEDs detection and protection.

The STCS44 is optimized and designed as a

companion chip for the STCF04 device, which is a

high current SuperCap flash led driver. The

STCS44, together with STCF04, creates a high-

power flash LED function with minimal application

area.

The device is packaged in a 3 x 3 mm QFN

package with 1 mm height.

QFN16 (3 x 3 mm.)

2500 parts per reel

Packaging

STCS44

www.st.com

Data brief

1/6

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stcs44pqr Summary of contents

Page 1

... Therefore, the operation of the device must be limited to a short period of time. Table 1. Device summary Order code STCS44PQR March 2009 For further information contact your local STMicroelectronics sales office. QFN16 ( mm.) This makes the device specifically suitable for flash light applications ...

Page 2

Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at ...

Page 3

QFN16 ( mm.) mechanical data mm. Dim. Min. Typ. A 0.80 0. 0.20 b 0.18 D 2.90 3.00 D2 1.50 E 3.00 E2 2.90 3.00 e 0.50 L 0.30 inch. Max. Min. Typ. 1.00 0.031 ...

Page 4

Tape & reel QFNxx/DFNxx ( mm.) mechanical data Dim. Min 12 4/6 mm. Typ. Max. Min. 180 13.2 0.504 0.795 2.362 14.4 3.3 3.3 1.1 4 ...

Page 5

Revision history Table 2. Document revision history Date Revision 24-Mar-2009 1 Changes First release. 5/6 ...

Page 6

... Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...

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