ST STCF04 User Manual

High power white LED SuperCap™ driver with I²C interface

Features

■ Buck-boost converter with 1.5 A peak current

limiting and synchronous rectification

■ Burst mode operation when output is charged

■ Input voltage range 2.5 V to 5.5 V

■ Programmable output charging voltage up to

5.5 V

■ Full I²C control

■ Operation modes:

– Shutdown mode
– Monitoring mode with NTC and SuperCap

monitoring
– Idle mode
–Flash mode
– Torch mode: up to 320 mA

■ Controlled LED current in all modes

■ Soft and hard triggering of Flash, Torch and

Picture light modes

■ Torch dimming in 12 exponential steps

■ Flash dimming in 8 steps

■ Active balancing of SuperCap voltage

■ SuperCap status flag

■ Internally or externally timed flash operation

■ Digitally programmable safety timeout in Flash

mode

■ Torch mode safety timeout

■ LED overtemperature detection and protection

with external NTC resistor

■ Shorted LED failure detection and protection

■ Chip overtemperature detection and protection

STCF04

Datasheet − production data

TFBGA25 (3 x 3 mm)

Applications

■ Cell phones and smartphones

■ Camera flashes/strobe

■ PDAs and digital still cameras

Description

The STCF04 is a dedicated and space optimized
high efficiency solution for driving a flash LED
module in cameras, phones, PDAs and other
handheld devices using the SuperCap
technology. It is based on a DC-DC buck-boost
converter, which ensures a proper and efficient
charging control and monitoring of the SuperCap
in the whole battery voltage range. The output
current control ensures a good current regulation
over the forward voltage spread characteristics of
the flash LEDs in Torch and Flash mode
operation. The SuperCap charging current is
limited to a defined value which avoids overload of
the battery. The SuperCap discharge current
flows through the LEDs and the external
MOSFET which must be chosen according to the
desired flash current.

Table 1. Device summary

Order code Package Packaging

STCF04TBR TFBGA25 (3 x 3 mm) 3000 parts per reel

May 2012 Doc ID 022927 Rev 2 1/43

This is information on a product in full production.

www.st.com

43

Contents STCF04

Contents

1 Description (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

8 Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8.1 Logic pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8.1.1 SCL, SDA pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8.1.2 FLASH pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8.1.3 TORCH pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8.1.4 RESET pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8.1.5 ATN pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8.1.6 ADD pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8.1.7 READY pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

8.1.8 Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

8.1.9 START and STOP conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

8.1.10 Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8.1.11 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8.1.12 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

8.1.13 Writing to a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

8.1.14 Writing to multiple registers with incremental addressing . . . . . . . . . . . 20

8.1.15 Reading from a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

8.1.16 Reading from multiple registers with incremental addressing . . . . . . . . 21

9 Description of the internal registers . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9.1 Commands (CMD_REG) 00(hex) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2/43 Doc ID 022927 Rev 2

STCF04 Contents

9.1.1 PWR_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9.1.2 FLASH_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9.1.3 TCH_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9.1.4 NTC_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9.1.5 TCHV_H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9.1.6 CHRG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9.1.7 MONTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9.2 Flash register (FL_REG) 01(hex) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9.3 AUX LED (AUX_REG) 02(hex) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

9.4 Status (STAT_REG) 03(hex) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

9.5 Feature (FTR_REG) 04(hex) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

9.6 Torch register (TRCH_REG) 05(hex) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

10 Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

10.1 The state machine diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

10.2 Power-ON reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

10.2.1 RESET pin function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

10.3 Shutdown mode and NTC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

10.4 Monitoring mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

10.5 Idle mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

10.6 AUX LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

10.7 Single or multiple flash using external (microprocessor) temporization . . 30

10.8 External (microprocessor) temporization using the FLASH_ON bit . . . . . 31

10.9 Single flash using internal temporization . . . . . . . . . . . . . . . . . . . . . . . . . 31

10.10 Light sensor feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

11 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

12 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Doc ID 022927 Rev 2 3/43

List of tables STCF04

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 6. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 7. I²C address table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 8. Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 9. I²C register mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 10. Command register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 11. Flash register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 12. Flash mode dimming registers settings (EXT_REG = 0) . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 13. Flash time dimming register settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 14. AUX LED register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 15. Auxiliary LED dimming table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 16. Auxiliary LED timing table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 17. Status register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 18. Status register details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table 19. Feature register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table 20. Light sensor reference dimming register settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table 21. DC-DC converter output voltages (V

Table 22. DC-DC converter coil peak current limit values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 23. Torch register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 24. Torch mode dimming registers settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 25. The safety timeout for Torch mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 26. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

OUT

4/43 Doc ID 022927 Rev 2

STCF04 List of figures

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 3. Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 4. Behavior of the READY pin in different modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 5. Data validity on the I²C bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 6. Timing diagram on I²C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 7. Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 8. Acknowledge on I²C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 9. Writing to a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 10. Writing to multiple registers with incremental addressing . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 11. Reading from a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 12. Reading from multiple registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 13. State machine diagram of the STCF04 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 14. Reset timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 15. Flash current vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 16. Torch current vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 17. Aux LED current vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 18. Charging efficiency vs. V

Figure 19. Torch time - settings compared to real values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 20. Torch current - settings compared to real values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 21. Flash time - settings compared to real values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 22. Flash current - settings compared to real values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 23. Aux LED time - settings compared to real values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 24. Aux LED current- settings compared to real values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 25. Operation in Flash mode - single flash pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 26. Operation in Flash mode - multiple flash pulses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 27. Operation in Torch mode with TCHV_H bit = 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 28. Operation in Torch mode with TCHV_H bit = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

voltage (VIN = 3.6 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

OUT

Doc ID 022927 Rev 2 5/43

Description (continued) STCF04

1 Description (continued)

All the functions of the device are controlled through the I²C bus which reduces the number
of logic pins of the package and saves PCB tracks on the application board. Hard and soft­triggering of flash and torch are both supported. The device includes many functions to
protect the chip and the power LEDs. These include a soft-start control, chip
overtemperature detection and protection, and shorted LED detection and protection. In
addition, a digital programmable timeout function protects the LEDs in case of a wrong
command issued by the microprocessor. An optional external NTC is supported to protect
the LEDs against overheating. It is possible to separately program the current intensity in
Flash and Torch mode through I²C. In order to guarantee the proper function of Flash mode,
the SuperCap voltage should be monitored by the microprocessor using the READY pin
feature. In case of insufficient power from the SuperCap, a warning is generated. The device
is packaged in BGA 3 x 3 mm with 1 mm height.

6/43 Doc ID 022927 Rev 2

STCF04 Diagram

2 Diagram

Figure 1. Block diagram

LSIN

NTC_ON

NTC_ON

LSIN

AUXLED

AUXLED

READY

READY

TORCH

TORCH

FLASH

FLASH

ATN

ATN

RESET

RESET

SCL

SCL

SDA

SDA

ADD

ADD

AUXLED

AUXLED

VBAT

VBAT

PREREG

PREREG

& BIAS

& BIAS

CONTROL

CONTROL

LOGIC

LOGIC

I²C

I²C

INTERF

INTERF

LSCON

LSCON

PVBAT

PVBAT

CONVERTER

CONVERTER

FLASH

FLASH

FLASH

FLASH

TRIGGERING

TRIGGERING

TRIGGERING

TRIGGERING
&CURRENT

&CURRENT

&CURRENT

&CURRENT

LIMITITING

LIMITITING

LIMITITING

LIMITITING

OSCILLATOR & TIME

OSCILLATOR & TIME

COUNTER

COUNTER

PROTECTIONS &

PROTECTIONS &

DIAGNOSTICS

DIAGNOSTICS

ON - CHIP

ON - CHIP

TEMP

TEMP

BUCK

BUCK

VLX1

VLX1

OVER -

OVER -

CURRENT

CURRENT

LED

LED

FAIL

FAIL

VLX2

VLX2

BOOST

BOOST

CONVERTER

CONVERTER

TORCH

TORCH

TORCH

TORCH

DIMMING

DIMMING

DIMMING

DIMMING

NTC_W

NTC_W

NTC_H

NTC_H

+

+

-

-

+

+

-

-

SUPERCAP

SUPERCAP

BALANCING &

BALANCING &

SUPERCAP

SUPERCAP

VOLTAGE

VOLTAGE

BALANCING &

BALANCING &

CONTROL

CONTROL

VOLTAGE

VOLTAGE
CONTROL

CONTROL

REF4

REF4

NTC_ON

NTC_ON

REF5

REF5

CURRENT

CURRENT
SENSING

SENSING

NTC

NTC

BIAS

BIAS

REF

REF
120 mV..1.2 V

120 mV..1.2 V

MX

MX

MX

MX

ENABLE/

ENABLE/

1.8 V REF

1.8 V REF

VOUT

VOUT

VMID

VMID

DRIVE

DRIVE

LED

LED

PGND

PGND

ISENS

ISENS

NTCRXPGND AGND

NTCRXPGND AGND

Doc ID 022927 Rev 2 7/43

Pin configuration STCF04

3 Pin configuration

Figure 2. Pin connection (top view)

Table 2. Pin description

Pin Symbol Description

A1 VLX1 Inductor connection 1

E1 VLX2 Inductor connection 2

D5 R

D1 VOUT SuperCap connection

C1 VMID SuperCap middle pin connection

E5 NTC NTC resistor connection

A3 READY SuperCap status flag pin

B3 SCL I²C clock signal

A4 FLASH Flash trigger input

E2 AGND Signal ground

B5 TORCH Torch trigger input

B4 RESET External reset input

D4 ISENS Flash regulator sensing connection

C3 ADD I²C address selection

E4 LED Diode module cathode connection

C4 ATN Attention (open drain output, active LOW)

B1 PVBAT Supply voltage

A5 SDA I²C data

E3 AUXLED Auxiliary red LED connection

B2 LSCON Light sensor capacitor connection

X

RX resistor connection

D3 VBAT Signal supply voltage

A2 LSIN Light sensor input

C5 DRIVE MOSFET driver output

C2, D2 PGND Power ground + die back connection

8/43 Doc ID 022927 Rev 2

STCF04 Maximum ratings

4 Maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

VBAT, PVBAT Signal supply voltage - 0.3 to 6 V

VLX Inductor connection - 0.3 to 6 V

VOUT SuperCap connection - 0.3 to 6 V

VDCDC DC-DC converter output - 0.3 to 6 V

VMID SuperCap middle pin connection - 0.3 to 6 V

AUXLED AUXLED connection - 0.3 to 6 V

LED LED connection - 0.3 to 6 V

SCL, SDA, ATN, ADD,

READY, TORCH,

FLASH, RESET

Logic pins - 0.3 to V

+ 0.3 V

BAT

PVBAT Power supply voltage - 0.3 to V

+ 0.3 V

BAT

DRIVE External MOSFET drive - 0.3 to 6 V

LSIN Light sensor input - 0.3 to 6 V

LSCON Light sensor capacitor connection - 0.3 to 6 V

R

X

Connection for reference resistor - 0.3 to 3 V

NTC Connection for LED temperature sensing - 0.3 to 3 V

ISENS Flash regulator sensing connection - 0.3 to 3 V

ESD Human body model ± 2kV

P

T

T

STG

TOT

OP

T

J

Continuous power dissipation (at TA=70 °C) 1 W

Operating junction temperature range - 40 to 85 °C

Junction temperature - 40 to 150 °C

Storage temperature range - 65 to 150 °C

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these conditions is not implied.

Table 4. Thermal data

Symbol Parameter Value Unit

R

thJA

1. This parameter corresponds to the PCB board, 8 layers with 1 inch² of cooling area.

Thermal resistance junction-ambient

(1)

56 °C/W

Doc ID 022927 Rev 2 9/43

Application STCF04

5 Application

Figure 3. Application schematic

Note: **: 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 are highlighted with blue
rectangles.

Note: The anode of the AuxLED should be also connected to the V

OUT

.

10/43 Doc ID 022927 Rev 2

STCF04 Application

Table 5. List of external components

Component Manufacturer Part number Value Size

L

Murata LQM2HPN1R0MJC 1 µH / 1.5 A 2.5 x 2.0 x 1.1 mm

TDK VLS252012T-1R0N1R7 1 µH / 1.7 A 2.5 x 2.0 x 1.2 mm

CIN, COUT TDK C1608X5R0J106MT 10 µF / 6.3 V 0603

Rx Rohm MCR01MZPJ15K 15 kΩ 0402

NTC Murata NCP21WF104J03RA 100 kΩ 0805

Murata DME2W5R5K404M 400 mF / 5.5 V 20.5 x 18.5 x 3 mm

EDLC152344 550 mF / 5.5 V 44 x 23 x 1.5 mm

CSUP

TDK

EDLC272020 500 mF / 5.5 V 20 x 20 x 2.7 mm

CAP-xx GS 2 19F 1.6 F / 5 V 40 x 17 mm

LED MODULE Luxeon 4x LXCL-PWF4 White LED 0805

T

FL

R

FL

(1)

C

INT

R

* Tyco 0402

LIGHT

T

* Vishay TEMT6000 4 x 2 x 1 mm

FOTO

STMicroelectronics STL8NH3LL 8 A / 12 kΩ 3.3 x 3.3 x 0.9 mm

Tyco TL2BR01FTE 0R01 1206

TDK 10 µF / 6.3 V 0402

AUXLED Red LED 0603

C

R

1. Optional components for the auxiliary light sensor feature.

100 nF 0402

Note: The components listed above refer to a typical application. However, STCF04 operation is

not limited to the choice of these external components.

Doc ID 022927 Rev 2 11/43

Electrical characteristics STCF04

6 Electrical characteristics

TA = 25 °C, V

= 15 kΩ, V

R

X

Table 6. Electrical characteristics

= 3.6 V connected to V

IN

= 4.2 V/10 A. Unless otherwise specified, typical values are at 25 °C.

FLED

BAT

and P

VBAT

, C

IN

= 10 µF, C

= 1.6F/5 V L = 1 µH,

SUP

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

V

PW_ON

RESET

IN

Operating input supply
voltage

Power-ON reset
threshold

2.5 5.5 V

VIN rising 2.3 V

Output current

Torch mode VIN=2.7 V to 5.5 V 15 320

Idle mode, VI or VO=3.3 V to 5.5 V 0 100

=2.7 V to 5.5 V, I

V

IN

= 10 mΩ

R

FL

V

=2.7 V to 5.5 V, IDC0=0 1.45

IN

=2.7 V to 5.5 V, IDC0=1 1.80

V

IN

LED

= 12 A

108 120 132 mV

V

ISENS

I

PEAK

adjustment range
I

I

O

TORCH

Auxiliary LED output
current adjustment
range I

AUXLED

Current sensing input

Switch peak current limit

Regulated voltage
range optimized for

V

=2.7 V to 5.5 V 4.5 5.5 V

IN

Flash mode

mA

A

V

OUT

I

MID

ΔI

Regulated voltage
range optimized for
Torch mode

V

tolerance

OUT

V

=2.7 V to 5.5 V

IN

Percentage with respect to
programmed voltage

V

+

FLED

0.25

-5 +5 %

V

Active balancing output VIN=2.7 V to 5.5 V -400 400 mA

Output current variation Torch mode I

O

Quiescent current in
Shutdown mode

Quiescent current in
Shutdown mode

I

Q

Quiescent current in
Monitoring mode

Quiescent current in Idle
mode

f

s

Switching frequency VIN=2.7 V 1.8 MHz

=2.7 to 5.5 V, NTC_ON=0 1

V

IN

VIN=2.7 to 5.5 V, NTC_ON=1 2

NTC_ON=0, SuperCap monitoring=1 45

NTC_ON, CHRG=0 1 mA

= 300 mA -10 10 %

LED

µA

12/43 Doc ID 022927 Rev 2

STCF04 Electrical characteristics

Table 6. Electrical characteristics (continued)

Symbol Parameter Test conditions Min. Typ. Max. Unit

Efficiency of the
converter

ν

Efficiency in Torch mode
operation

=3.7 V, VDC_0,1=1, IDC0=1 85

V

IN

=2.7 V to 4.2 V, IDC_0=1,

V

IN

TCHV_H=1 I

=2.7 V to 4.2 V, IDC_0=1,

V

IN

TCHV_H=0 I

V

SUPMAX

V

SUPHYST,

FLASH_ON=1

V

SUPMAX

V

SUPHYST,

FLASH_ON=1

V

SUPMAX

V

SUPHYST

V

SUPHYST

SuperCap regulated
voltage hysteresis

FLASH_ON=1

V

SUPMAX

V

SUPHYST

V

MONIREADY

OTP

OTHYST

SuperCap voltage ready
hysteresis

Overtemperature
protection

Overtemperature
hysteresis

PWR_ON=0, VDC_0 or/and VDC_1=1 0.2 V

=5.5 V 140 C

V

IN

=5.5 V 20 C

V

IN

V_NTCW NTC threshold warning Idle mode, I

V_NTCH NTC threshold hot Idle mode, I

VOL

Output logic signal level
low ATN, READY

I

ATN, READY

=320 mA

TORC H

=320 mA

TORC H

=5.5 V, V

SUPMIN

=5.5 V-

TCHV_H=1 or

=5.0 V, V

SUPMIN

=5.0 V-

TCHV_H=1 or

=4.5 V, V

SUPMIN

=4.5 V-

, TCHV_H=1 or

=4.2 V, V

SUPMIN

=4.2 V-

, TCHV_H=0

=2 mA max. 0.56 V

NTC

=2 mA max. 1.2 V

NTC

50

70

1.3

0.8

0.3

0.2

=+10 mA 0.3 V

%

V

I

OZ

V

IL

V

IH

I

LSCON

V

LSIN

V

DRIVE

T

ON

Output logic leakage
current ATN, READY

V

ATN, READY

=3.3 V 1 mA

Input logic signal level
SCL, SDA, TEST,
RESET, SCHRG,

=2.7 V to 5.5 V

V

IN

FLASH, TORCH, ADD

Input reset current VIN=2.7 V to 5.5 V, V

Analog input signal
range

MOSFET driver output

Reference voltage
range

LED current rise time
I

LED

=0 to I

LED

=max.

V

=2.7 V to 5.5 V 0.1 1.6 V

IN

Source: I

Sink: I

DRIVE

EXT_REG=1

= -8 mA 4.27 V

DRIVE

= +8 mA 1.05 V

(1)

Flash triggered by external trig 0.3 ms

Doc ID 022927 Rev 2 13/43

00.4

1.4 3.0

=1.6 V 10 mA

REF

0.12 1.2 V

V