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STCF03ITBR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33
September 2008 Rev 5 1/33
33
STCF03I
High power white LED driver with I²C interface
Features
■ Buck-boost DC/DC converter
■ Drives one power white LED up to:
800 mA between 3.3 V to 5.5 V
600 mA between 2.7 V to 5.5 V
■ Efficiency up to 92%
■ Output current control
■ 1.8 MHz typ fixed frequency PWM
■ Synchronous rectification
■ Full I²C control
■ Operational modes:
Shutdown mode
■ Ready mode + auxiliary red LED
Ready mode + NTC
Flash mode: up to 800 mA
Torch mode: up to 200 mA
■ Soft and hard triggering of flash
■ Flash and torch dimming with 16 exponential
values
■ Dimmable red LED indicator auxiliary output
■ Internally or externally timed flash operation
■ Digitally programmable safety time-out in flash
mode
■ LED overtemperature detection and protection
with external NTC resistor
■ Opened and shorted LED failure detection and
protection
■ Chip over temperature detection and protection
■ < 1 µA Shutdown current
■ Package (3x3 mm) TFBGA25
Applications
■ Cell phone and smart phones
■ Camera flashes/strobe
■ PDAs and digital still cameras
Description
The STCF03I is a high efficiency power supply
solution to drive a single flash LED in camera
phone, PDAs and other hand-held devices. It is a
buck - boost converter to guarantee a proper LED
current control over all possible conditions of
battery voltage and output voltage; the output
current control ensures a good current regulation
over the forward voltage spread characteristics of
the flash LED.
Thanks to the high efficiency of the converter, the
input current taken from the battery remains
under 1.5 A. All the functions of the device are
controlled through the I²C bus which helps to
reduce logic pins on the package and to save
PCB tracks on the board. (See 1: Description
(continued))
TFBGA25 (3x3)
Table 1. Device summary
Order code Package Packaging
STCF03ITBR TFBGA25 (3x3 mm) 3000 parts per reel
www.st.com
Obsolete Product(s) - Obsolete Product(s)
STCF03I
2/33
Contents
1 Description (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1 Buck-Boost converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.2 Logic pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.2.1 SCL, SDA pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.2.2 TRIG pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.2.3 ATN pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.2.4 ADD pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.2.5 TMSK pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.3 I²C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.4 Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.5 Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.6 Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.7 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.8 Writing to a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.9 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.10 Writing to multiple registers with incremental addressing . . . . . . . . . . . . 18
7.11 Reading from a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.12 Reading from multiple registers with incremental addressing . . . . . . . . . 19
8 Description of internal registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.1 PWR_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.2 TRIG_EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Obsolete Product(s) - Obsolete Product(s)
STCF03I
3/33
8.3 TCH_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.4 NTC_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.5 FTIM_0~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.6 TDIM_0~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.7 FDIM_0~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.8 AUXI_0~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.9 AUXT_0~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.10 F_RUN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.11 LED_F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.12 NTC_W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.13 NTC_H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.14 OT_F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.15 VOUTOK_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9 Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.1 PowerON reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.2 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.3 Ready mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.4 Single or multiple Flash using external (µP) temporization . . . . . . . . . . . 25
9.5 External (µP) temporization using TRIG_EN bit . . . . . . . . . . . . . . . . . . . . 26
9.6 Single Flash using internal temporization . . . . . . . . . . . . . . . . . . . . . . . . 26
9.7 Multiple Flash using internal temporization . . . . . . . . . . . . . . . . . . . . . . . 26
10 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Obsolete Product(s) - Obsolete Product(s)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33

STCF03ITBR

Mfr. #:
Buy STCF03ITBR
Manufacturer:
STMicroelectronics
Description:
IC LED DRIVER RGLTR DIM 25TFBGA
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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