ST STCF03 User Manual
February 2011 Doc ID 13169 Rev 7 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 (4 x 4)
– TFBGA25 (3 x 3)
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.
TFBGA25 (3 x 3)
QFN20 (4 x 4)
Table 1. Device summary
Order codes Packages Packaging
STCF03PNR QFN20 (4 x 4 mm) 4500 parts per reel
STCF03TBR TFBGA25 (3 x 3 mm) 3000 parts per reel
www.st.com
Contents STCF03
2/35 Doc ID 13169 Rev 7
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
STCF03 Contents
Doc ID 13169 Rev 7 3/35
8.2 TRIG_EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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 (microprocessor) temporization . 25
9.5 External (microprocessor) 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 tables STCF03
4/35 Doc ID 13169 Rev 7
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 5. List of external components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 6. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 7. Address table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 8. Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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. QFN20 (4 x 4 mm.) mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 18. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
STCF03 List of figures
Doc ID 13169 Rev 7 5/35
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 2. Pin connections (bottom view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3. Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. Procedure for assigning a non-default I²C address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 5. Data validity on the I²C Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 6. Timing diagram on I²C Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 7. Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 8. Acknowledge on I²C Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 9. Writing to a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10. Writing to multiple register with incremental addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 11. Reading from a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 12. Reading from multiple registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 13. Flash and Torch current vs. dimming value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 14. VOUTOK_N behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 15. Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 16. I
OTORCH
vs. T_DIMM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 17. I
OFLASH
vs. F_DIMM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 18. IOAUX vs. AUXI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 19. I
OFLASH
vs. temp. V
I
= 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 20. VFB2 vs. temp. at I
O
= 800 mA,V
I
= 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 21. I
Q
vs. temp. V
I
= 5.5 V ready-mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 22. Start-up in flash mode 800 mA at V
I
= 3.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 23. Line transient in flash mode 800 mA, change of V
I
from 2.7 V to 3.3 V in 10 µs . . . . . . . . 28
Figure 24. QFN20 (4 x 4 mm.) drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Description (continued) STCF03
6/35 Doc ID 13169 Rev 7
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
microprocessor. 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 (4 x 4 mm) 20L with a height less than 1 mm and in
TFBGA25 (3 x 3 mm).
STCF03 Diagram
Doc ID 13169 Rev 7 7/35
2 Diagram
Figure 1. Block diagram
Pin configuration STCF03
8/35 Doc ID 13169 Rev 7
3 Pin configuration
Figure 2. Pin connections (bottom view)
TFBGA25 (3x3)
QFN20 (4x4)
Table 2. Pin description
Pin n° for
QFN20
Pin n° for
TFBGA25
Symbol Name and function
1 E1, D2 VLX2 Inductor connection
2B3RXR
X
resistor connection
3 A4 NTC NTC resistor connection
4 D1, C2 VOUT Output voltage
5 B5 FB1 Feedback pin [I
LED
*(R
FL
+R
TR
)]
6A5FB2R
TR
bypass
7 B4 FB2S Feedback sensing pin [I
LED
*R
FL
]
8 E2 GND Signal ground
9 D4 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
STCF03 Maximum ratings
Doc ID 13169 Rev 7 9/35
4 Maximum ratings
Table 3. Absolute maximum ratings
(1)
1. Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under
these condition is not implied.
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 V
I
+0.3 V
VLX2 Inductor connection 2 –0.3 to V
O
+0.3 V
VOUT Output voltage -0.3 to 6 V
AUXL Auxiliary LED –0.3 to V
I
+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 V
I
+0.3 V
R
X
Connection for reference resistor -0.3 to 3 V
NTC Connection for LED temperature sensing -0.3 to 3 V
ESD Human body model ±2kV
P
TOT
(BGA)
(2)
2. Power dissipation is related parameter to used PCB. The recommended PCB design is included in the application note.
Continuous power dissipation (at T
A
=70°C) 800 mW
T
OP
Operating junction temperature range -40 to 85 °C
T
J
Junction temperature -40 to 150 °C
T
STG
Storage temperature range -65 to 150 °C
Table 4. Thermal data
Symbol Parameter QFN20 TFBGA25 Unit
R
thJA
Thermal resistance junction-ambient 59 150 °C/W
Application STCF03
10/35 Doc ID 13169 Rev 7
5 Application
**: Connect to V
I
, 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
C
I
TDK X5R0J106M 10 µF 0603
C
O
TDK X5R0J105M 1 µF 0603
L (I
FLASH
= 0.5A) TDK VLF3012ST-4R7MR91 4.7 µH 2.6 x 2.8 x 1.2 mm
L (I
FLASH
= 0.8A) TDK VLF4012AT-4R7M1R1 4.7 µH 3.7 x 3.5 x 1.2 mm
NTC Murata NCP21WF104J03RA 100 kΩ 0805
R
FL
0.27 Ω 0603
R
TR
1.8 Ω 0402
R
X
15 kΩ 0402
STCF03 Electrical characteristics
Doc ID 13169 Rev 7 11/35
6 Electrical characteristics
T
J
= 25 °C, V
I
= 3.6 V, 2 x C
I
= 10 µF, C
O
= 1 µF, L = 4.7 µH, R
FL
= 0.27 Ω, R
TR
= 1.8 Ω,
R
X
= 15 kΩ, Typ. values @ 25 °C, unless otherwise specified.
Table 6. Electrical characteristics
Symbol Parameter Test condition Min. Typ. Max. Unit
V
I
Input operation supply voltage 2.7 5.5 V
V
PW_ON
RESET
Power ON reset threshold V
I
rising 2.3 V
I
O
Output current adjustment
range I
FLASH
Flash mode for V
I
= 2.7 V to 5.5 V
(STCF03PNR)
60 800
mA
Flash mode for V
I
= 2.7 V to 3.3 V
(STCF03TBR)
60 600
Flash mode for V
I
=3.3 V to 5.5 V
(STCF03TBR)
60 800
Output current adjustment
range I
TORC H
Torch mode V
I
= 2.7 V to 5.5 V 15 200
Auxiliary LED output current
adjustment range I
AUXLED
Ready mode, V
I
= 3.3 V to 5.5 V 0 20
V
O
Regulated voltage range 2.5 5.3 V
FB1 Feedback voltage Torch mode 30 250 mV
FB2 Feedback voltage Flash mode 30 250 mV
ΔI
O
Output current tolerance Flash mode, I
O
= 160 mV/R
FL
-10 10 %
R
ON_
FB1-FB2 ON resistance Torch mode, I
O
= 200 mA 90 mΩ
I
Q
Quiescent current in
SHUTDOWN mode
NTC_ON=0 1
µA
NTC_ON=1 1
Quiescent current in ready -
mode
1.8 mA
f
s
Frequency V
I
= 2.7 V 1.8 MHz
ν
Efficiency of the chip itself
V
I
= 3.2 to 4.2 V, flash mode,
I
O
= 800 mA
87
%
Efficiency of the whole
application
V
I
= 3.2 to 4.2 V, flash mode,
I
O
= 800 mA, V
O
=V
fLED_max
+ V
FB2
=
5.02 V
See the typical application schematic
It is included losses of inductor and
sensing resistor
76
OVP Output over voltage protection V
I
= 5.5 V, No Load 5.3 V
OV
HYST
Over voltage hysteresis V
I
= 5.5 V, No Load 0.3 V
OTP Over temperature protection V
I
= 5.5 V 140 °C
OT
HYST
Over temperature hysteresis V
I
= 5.5 V 20 °C
R
ON
T1 RX-NTC switch ON resistance Ready mode 25 Ω
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