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SC4505 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4505 Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 15 page 1 www.semtech.com SC4505 High Efficiency Boost Converter for Backlight/Flash LED Driver POWER MANAGEMENT Description Features Applications White LED power supplies Flat screen LCD bias supplies TFT bias supplies Dual panel Handset/Liquid Crystal Display Monitor Portable media players Digital video cameras Digital still cameras The SC4505 is a high-frequency PWM current-mode step- up switching regulator with an integrated 2A power tran- sistor. Its high switching frequency (1MHz) allows the use of tiny surface-mount external passive components. The internal switch is rated at 36V which makes the con- verter ideal for multiple LED series operation with opti- mal current matching. Two programmable independent current source structure allows dual panel LED backlight and flash operation. The operating frequency of the SC4505 is set at 1MHz. The selected operating frequency gives the SC4505 de- sign flexibility for size, cost and efficiency optimization. The SC4505 is available in thermally enhanced 16-pin MLPQ package (3x3x0.9mm) with embedded over tem- perature protection. Typical Application Circuit Two independent current sources for dual LED strands with optimal current/light matching. Backlight up to 75mA, Flash up to 125mA Wide input range from 2.6V to 12V Adaptive output voltage up to 28V with OVP protec- tion against open circuit conditions Low shutdown current (<1 µA ) Internal Flash/Torch mode with flash timeout to pro- tect LEDs 1MHz Fixed Frequency Current-Mode Control Internal 2A current limit for driving large numbers of LEDs Supports PWM Dimming from 50Hz to 50kHz Internal undervoltage lockout Small, low profile, thermally enhanced 16-MLPQ pack- age is fully WEEE and RoHS compliant Revision: December 12, 2007 Figure 1. SC4505 Application Circuit for Backlight and Flashlight LED Driver All Capacitors are Ceramic. Boost Converter Efficiency vs Input Voltage (2 String of 3 LEDs @30mA) 77 79 81 83 85 87 2.5 3 3.5 4 4.5 5 Input Voltage (V) 0 L1 IHLP-2525CZ-01-1R5-M-01 Analog Ground EN_BL C4 12n FL_TRB EN_FL D4 LED SC4505 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PGND PGND SW SW VO IO2 IO1 COMP AGND IO2SET IO1SET EN_BL EN_FL FL_TRB FTO VIN Power Ground D5 LED D7 LED (Optional) 0 AGND (Optional) C6 12n 0 C2 2.2u D2 LED PGND R1 3.01k RO2SET 1.54k D6 LED 0 D1 10BQ015 2 1 RO1SET 6.98k C3 0.33uF 0 C1 2.2uF LED: SML-LX0603UWD VIN: 2.6V ~ 6.0V D3 LED 0 C5 12n |
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