STCF07PNR STMicroelectronics

STCF07 High power buck-boost white LED driver Datasheet production data Features Buck-boost DC-DC converter Drives one power LED up to 1 A in flash mode Drives one power LED up to 800 mA in continuous mode LED temperature protection Output current control QFN16 (4 x 4 mm) 1.8 MHz (typ.) fixed frequency PWM Synchronous rectification High efficiency across the total input voltage range Operational modes: Description Shutdown mode High current mode: up to 1 A The STCF07 is a dedicated, size-optimized solution for driving a power LED. The device is a Low current mode: from 20 mA buck-boost converter which guarantees proper Adjustable current in both modes LED current control over all possible battery Peak inductor limited to 2.3 A (typ.) voltage and LED forward voltage conditions. The output current control ensures good current LED disconnected from the battery in regulation over the forward voltage spread shutdown mode characteristics of high-brightness LEDs. The NTC LED temperature protection device includes various functions to protect the Overvoltage protection: 5.3 V chip and the power LEDs. These include soft-start control as well as detection and protection of chip Short-circuit protection overtemperature and shorted LEDs. An optional Overtemperature protection external NTC is supported to protect the LEDs ULVLO function against overheating. It is possible to separately program the current intensity in HIGH and LOW 1 A max shutdown current mode using the SEL pin. The device is housed in QFN16 (4 x 4 x 1 mm) 16 leads a 16-lead QFN16 (4 x 4 mm) package with a height less than 1 mm. Applications Camera flash for mobile phones Power supply for high power LEDs Table 1. Device summary Order code Package Packaging STCF07PNR QFN16 (4 x 4 mm) Tape and reel September 2012 Doc ID 16757 Rev 3 1/26 This is information on a product in full production. www.st.com 26Contents STCF07 Contents 1 Block diagram 3 2 Pin configuration 4 3 Maximum ratings 5 4 Application information 6 5 Electrical characteristics . 8 6 Introduction . 10 7 Logic pin description . 11 7.1 CSEL pin . 11 7.2 FAULT pin . 11 7.3 ENABLE pin . 11 8 Detailed description 12 8.1 Buck-boost converter 12 8.2 High current mode 12 8.3 Low current mode . 12 8.4 Shutdown mode 12 8.5 Soft-start 12 8.6 STCF07 protection features . 13 8.6.1 Peak current and short-circuit protection 13 8.6.2 Overvoltage protection 13 8.6.3 Thermal shutdown protection 13 8.6.4 Sensing of LED temperature with the NTC resistor 13 8.6.5 Undervoltage lockout function 14 9 PCB design . 15 9.1 PCB design rules . 15 9.2 PCB design of the demonstration board . 16 9.3 Schematic of the demonstration board . 18 2/26 Doc ID 16757 Rev 3