STCF03ITBR;中文规格书,Datasheet资料

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))

Table 1.

Device summary

Order code Package Packaging STCF03ITBR

TFBGA25 (3x3 mm)

3000 parts per reel

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Contents

1Description (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

7.1Buck-Boost converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137.2

Logic pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

7.2.1SCL, SDA pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137.2.2TRIG pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137.2.3ATN pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137.2.4ADD pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7.2.5

TMSK pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7.3

I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157.4Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7.5Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157.6Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167.7Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167.8Writing to a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177.9Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7.10Writing to multiple registers with incremental addressing . . . . . . . . . . . . 187.11Reading from a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187.12

Reading from multiple registers with incremental addressing . . . . . . . . . 19

8

Description of internal registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

8.1PWR_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208.2

TRIG_EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

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8.3TCH_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208.4NTC_ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208.5FTIM_0~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.6TDIM_0~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.7FDIM_0~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.8AUXI_0~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228.9AUXT_0~3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228.10F_RUN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238.11LED_F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238.12NTC_W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238.13NTC_H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238.14OT_F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238.15

VOUTOK_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

9Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

9.1PowerON reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259.2Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259.3Ready mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259.4Single or multiple Flash using external (μP) temporization . . . . . . . . . . . 259.5External (μP) temporization using TRIG_EN bit . . . . . . . . . . . . . . . . . . . . 269.6

Single Flash using internal temporization . . . . . . . . . . . . . . . . . . . . . . . . 269.7

Multiple Flash using internal temporization . . . . . . . . . . . . . . . . . . . . . . . 26

10Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

11Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2912

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

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List of tables STCF03I 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 7.Address table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 8.Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 9.I2C register mapping function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table https://www.wendangku.net/doc/7c17413329.html,mand 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.Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

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List of figures STCF03I 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 registers 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.Flash current vs F_DIMM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 16.Torch current vs T_DIMM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 17.Aux current vs AUXI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 18.Flash current vs temp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 19.V FB2 Flash vs temp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 20.I Q vs temp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 21.Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 VI from 2.7 V to 3.3 V in 10 μs . . . . . . . 28

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Description (continued)STCF03I 1 Description

(continued)

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 3x3 mm μTFBGA25 with a height less than 1 mm.

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Diagram STCF03I 2 Diagram

NTC_REF

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Pin configuration STCF03I

3 Pin configuration

Table 2.

Pin description

Pin n°Symbol Description

E1,D2VLX2Inductor connection

B3RX Rx resistor connection D1,C2VOUT Output voltage

A4NTC NTC resistor connection B5FB1

Feedback pin [I LED *(R FL +R TR )]A5FB2

R TR bypass

B4

FB2S Feedback pin [I LED *R FL ]

E2

GND

Signal ground C5TMSK TX mask input.D5AUXL

Auxiliary LED output D4ADD

I2C address selection A3VBA T Supply voltage B1,C1

PVBA T Power supply voltage A2VLX1A Inductor connection A1,B2

VLX1B Inductor connection

E4A TN Attention (open drain output, active LOW)E3

SDA I2C data C3,D3PGND Power ground E5SCL I2C clock signal C4

TRIG

Flash trigger input

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Maximum ratings STCF03I

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 VBA T Signal supply voltage -0.3 to 6V PVBA T Power supply voltage -0.3 to 6V VLX1A, VLX1B

Inductor connection 1–0.3 to V I +0.3V VLX2Inductor connection 2–0.3 to V O +0.3V

VOUT Output Voltage -0.3 to 6

V AUXL Auxiliary LED

–0.3 to V I +0.3V FB1, FB2, FB2S

Feedback and sense voltage

-0.3 to 3

V SCL, SDA, TRIG,

A TN, ADD TMSK

Logic pin

-0.3 to V I +0.3V R X Connection for reference resistor -0.3 to 3V NTC Connection for LED T emperature sensing -0.3 to 3V ESD Human body model

±2kV P TOT (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 T A =70°C)800mW 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

Value Unit R thJA

Thermal resistance junction-ambient

150

°C/W

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Application STCF03I

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 STCF03I 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 0603C O

TDK X5R0J105M 1 μF 0603L (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 VLF4012A T -4R7M1R1 4.7 μH 3.7 x 3.5 x 1.2 mm

NTC Murata

NCP21WF104J03RA

100 k Ω0805R FL 0.27 Ω0603R TR 1.8 Ω0402R X 15 k Ω

0402

LED

Luxeon LED

LXCL-PW1

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分销商库存信息: STM

STCF03ITBR