STMicroelectronics STCF03 Manual de usuario
September 2007 Rev. 4 1/35
35
STCF03
High power white LED driver with I2C™ interface
Features
■Buck-boost dc/dc converter
■Drives one power white LED up to 800 mA from
2.7 V to 5.5 V in QFN
■Drives one power white LED up to 800 mA from
3.3 V to 5.5 V in BGA
■Efficient up to 92%
■Output current control
■1.8 MHz typ. fixed frequency PWM
■Synchronous rectification
■Full I2C control
■Operational modes:
– Shutdown mode
– Shutdown + NTC
– Ready mode + auxiliary red LED
– 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
■Packages:
– QFN20 (4x4)
– TFBGA25 (3x3)
Applications
■Cell phone and smart phone
■Camera flashes/strobe
■PDAs and digital still cameras
Description
The STCF03 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 ensure a good current regulation
over the forward voltage spread characteristics of
the Flash LED.
Thanks to the high efficiency of the converter
allows having the input current taken from the
battery remain under 1.5 A. (See continuous
description)
TFBGA25 (3x3)
QFN20 (4x4)
Table 1. Device summary
Order code Package Packaging
STCF03PNR QFN20 (4x4 mm) 4500 parts per reel
STCF03TBR (1) TFBGA25 (3x3 mm) 3000 parts per reel
1. Available on request.
www.st.com
STCF03
2/35
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.4 Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.5 Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.6 Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.7 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.8 Writing to a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.9 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.10 Writing to multiple registers with incremental addressing . . . . . . . . . . . . 17
7.11 Reading from a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.12 Reading from multiple registers with incremental addressing . . . . . . . . . 18
8 Description of internal registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.1 PWR_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.2 TRIG_EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
STCF03
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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, shutdown with NTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
List of figures STCF03
4/35
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 2. Pin connections (bottom view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3. Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. Data validity on the I2C Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 5. Timing diagram on I2C Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 6. Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 7. Acknowledge on I2C Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 8. Writing to a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 9. Writing to multiple register with incremental addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 10. Reading from a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 11. Reading from multiple registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 12. Flash and Torch current vs. dimming value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 13. VOUTOK_N behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 14. Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 15. IOTORCH vs T_DIMM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 16. IOFLASH vs F_DIMM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 17. IOAUX vs AUXI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 18. IOFLASH vs Temp. VI= 3.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 19. VFB2 vs Temp. at IO= 800 mA, VI= 3.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 20. IQvs Temp. VI= 5.5 V Ready-Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 21. Start-Up in Flash Mode 800mA at VI= 3.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 22. Line transient in Flash Mode 800 mA, change of VIfrom 2.7 V to 3.3 V in 10 µs. . . . . . . . 28
List of tables STCF03
5/35
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3. Absolute maximum ratings (see note) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 5. List of external components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 6. Electrical characteristics (TJ= 25°C, VI= 3.6 V, 2xCI = 10 µF, CO= 1 µF, L = 4.7 µH,
RFL = 0.27 ΩRTR = 1.8 Ω, RX= 15 KΩ, Typ. values @25°C, unless otherwise specified). 11
Table 7. Address table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 8. Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 9. I2C Register mapping function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 10. Command register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 11. Dimming register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 12. Auxiliary register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 13. Auxiliary led dimming table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 14. Torch Mode and Flash Mode dimming registers settings . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 15. Status register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 16. Status register details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 17. Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Description (continued) STCF03
6/35
1 Description (continued)
All the functions of the device are controlled through the I2C which helps bus that allows to
reduce logic pins on the package and to save PCB tracks on the board. Hard and soft-
triggering of Flash are both supported. The device includes many functions to protect the
chip and the power LED such as: a soft start control, chip over temperature detection and
protection as well as opened and shorted LED detection and protection. Besides, a digital
programmable Time Out function protects the LED in case of a wrong command from the
µP. An optional external NTC resistor is supported to protect the LED against over heating.
In mobile phone applications it is possible to reduce immediately the Flash LED current
during the signal transmission using the TMSK pin. This saves battery life and gives more
priority to supply RF transmission instead of flash function.
It is possible by I2C to separately program the current intensity in FLASH and TORCH
MODE using exponential steps. An auxiliary output can control an optional red LED to be
used as a recording indicator.
The device is packaged in QFN 4x4 20L with a height less than 1 mm and in TFBGA25 3x3.
Pin configuration STCF03
8/35
3 Pin configuration
Figure 2. Pin connections (bottom view)
TFBGA25 (3x3)
QFN20 (3x3)
Table 2. Pin description
Pin n° for
QFN20
Pin n° for
TFBGA25 Symbol Name and function
1 E1, D2 VLX2 Inductor connection
2 B3 RX Rx resistor connection
3 A4 NTC NTC resistor connection
4 D1, C2 VOUT Output voltage
5B5
FB1 Feedback pin [ILED*(RFL+RTR)]
6A5
FB2 RTR bypass
7B4
FB2S Feedback sensing pin [ILED*RFL]
8 E2 GND Signal ground
9D4
ADD I2C address selection
10 D5 AUXL Auxiliary LED output
11 C5 TMSK TX mask input.
12 B1, C1 PVBAT Power supply voltage
13 A3 VBAT Supply voltage
14 A2 VLX1A Inductor connection
15 A1, B2 VLX1B Inductor connection
16 E5 SCL I2C clock signal
17 E3 SDA I2C data
18 C3, D3 PGND Power ground
19 E4 ATN Attention (open drain output, active LOW)
20 C4 TRIG Flash trigger input
Exposed pad PGND To be connected to the PCB ground plane for optimal electrical and
thermal performance.
Maximum ratings STCF03
9/35
4 Maximum ratings
Note: Absolute Maximum Ratings are those values beyond which damage to the device may
occur. Functional operation under these condition is not implied.
Table 3. Absolute maximum ratings (see note)
Symbol Parameter Value Unit
VBAT Signal supply voltage -0.3 to 6 V
PVBAT Power supply voltage -0.3 to 6 V
VLX1A, VLX1B Inductor connection 1 –0.3 to VI+0.3 V
VLX2 Inductor connection 2 –0.3 to VO+0.3 V
VOUT Output voltage -0.3 to 6 V
AUXL Auxiliary LED –0.3 to VI+0.3 V
FB1, FB2, FB2S Feedback and sense voltage -0.3 to 3 V
SCL, SDA, TRIG,
ATN, ADD TMSK
Logic Pin -0.3 to VI+0.3 V
RXConnection for reference resistor -0.3 to 3 V
NTC Connection for LED Temperature sensing -0.3 to 3 V
ESD Human body model ±2kV
PTOT (BGA) (1)
1. Power dissipation is related parameter to used PCB. The recommended PCB design is included in the application note.
Continuous power dissipation (at TA=70°C) 800 mW
TOP Operating junction temperature range -40 to 85 °C
TJJunction temperature -40 to 150 °C
TSTG Storage temperature range -65 to 150 °C
Table 4. Thermal data
Symbol Parameter QFN20 TFBGA25 Unit
RthJA Thermal resistance junction-ambient 59 150 °C/W
Application STCF03
10/35
5 Application
**: Connect to VI, or GND or SDA or SCL to choose one of the 4 different I2C Slave Addresses.
***: Optional components to support auxiliary functions.
Note: All of the above listed components refer to typical application. Operation of the STCF03 is
not limited to the choice of these external components.
Figure 3. Application schematic
Table 5. List of external components
Component Manufacturer Part number Value Size
CITDK X5R0J106M 10 µF 0603
COTDK X5R0J105M 1 µF 0603
L (IFLASH = 0.5A) TDK VLF3012ST-4R7MR91 4.7 µH 2.6 x 2.8 x 1.2mm
L (IFLASH = 0.8A) TDK VLF4012AT-4R7M1R1 4.7 µH 3.7 x 3.5 x 1.2mm
NTC Murata NCP21WF104J03RA 100kΩ0805
RFL 0.27Ω0603
RTR 1.8Ω0402
RX15kΩ0402
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