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SC4541 Dataheets PDF



Part Number SC4541
Manufacturers Semtech
Logo Semtech
Description High Frequency LED Driver
Datasheet SC4541 DatasheetSC4541 Datasheet (PDF)

SC4541 POWER MANAGEMENT Features High Frequency LED Driver with Integrated Schottky and Simple Interconnect Description „„ VIN Range — 2.9V to 22V „„ VOUT Range — Up to 25V „„ IOUT Range: „„ Up to 100mA (Boost) „„ Up to 200mA (Buck) „„ Drives Up to 7 Series WLEDs (Boost) „„ Drives Up to 5 Series WLEDs (Buck) „„ Integrated Schottky Rectifier „„ Single-Wire LED Connect „„ Current Mode Control „„ Frequency — 2.0MHz „„ No External Compensation „„ Direct PWM Dimming „„ 100:1 Range at 500Hz „„ Open.

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SC4541 POWER MANAGEMENT Features High Frequency LED Driver with Integrated Schottky and Simple Interconnect Description „„ VIN Range — 2.9V to 22V „„ VOUT Range — Up to 25V „„ IOUT Range: „„ Up to 100mA (Boost) „„ Up to 200mA (Buck) „„ Drives Up to 7 Series WLEDs (Boost) „„ Drives Up to 5 Series WLEDs (Buck) „„ Integrated Schottky Rectifier „„ Single-Wire LED Connect „„ Current Mode Control „„ Frequency — 2.0MHz „„ No External Compensation „„ Direct PWM Dimming „„ 100:1 Range at 500Hz „„ Open-LED Protection — 27V „„ Low Shutdown Current < 1µA „„ Package Options: „„ Low Profile MLPD-UT, 6-pin 2x2 x0.6(mm) „„ SOT23, 6-pin 2.9x2.8 x1.45(mm) „„ Lead-free, Halogen-Free and WeEE/RoHS Compliant Applications „„ Keypad Illumination „„ DSC and DSLR Display Backlight „„ Cellular Handsets „„ Automotive Lighting The SC4541 is a fully integrated, high voltage boost (stepup) and buck (step-down) LED driver. The input voltage range is 2.9V to 22V with output voltage up to 25V. The device is capable of driving up to 7 white LEDs. The high side sense enables a single-wire LED connection by taking advantage of the available system ground. This reduces connector cost and complexity. The device includes a current mode PWM controller, 260mA power switch, and high performance Schottky rectifier. The LED driver eliminates external compensation components for minimum solution size. The wide input voltage range and low standby current are ideal for portable devices. The high input voltage allows direct connection to multi-cell battery packs which increases operating efficiency and extends battery life. Output current is programmed with an external sense resistor up to 100mA (Boost) or 200mA (Buck). The device provides ±5% constant current accuracy across the entire operating temperature range. A logic level PWM dimming signal may be applied directly to the enable (EN) pin - for direct PWM dimming with a wide dimming range. Output OVP (over voltage protection) protects the SC4541 from open circuit faults in the LED string or connector. External OVP programming resistors are not required. The SC4541 is available in low profile MLPD-UT and SOT23,6-pin packages. The device is rated across the temperature range -40°C to +85°C. Typical Application Circuit VIN 2.9V to 22V Boost Topology IOUT up to 100mA L1 C1 10μF 1μF IN SW OUT VOUT Up to 25V SC4541 C2 1μF RS 10Ω PWM Dimming EN GND FB 7 WLED @ 20mA Version 1.3 © 2011 Semtech Corporation 1 Pin Configuration, MLPD-UT6 IN 1 GND 2 SW 3 TOP VIEW T 6 EN 5 FB 4 OUT MLPD-UT: 2 x 2(mm) 6 Lead θJA = 75º C/W Marking Information, MLPD-UT6 SC4541 Pin Configuration, SOT23-6 OUT 6 FB 5 EN 4 Top View 12 SW GND 3 IN SOT23, 6 Lead θJA = 150º C/W Marking Information, SOT23-6 FR7 = Code for SC4541 EW = Datecode Ordering Information Device Package SC4541SKTRT(1,2) SOT23-6 SC4541ULTRT(1,2) 2 x 2 x 0.6(mm) MLPD-UT6 SC4541EVB-1 SC4541EVB-2 Evaluation Board, SOT23-6 Evaluation Board, MLPD-UT6 Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Available in lead-free package only. Device is WEEE/RoHS compliant and halogen-free. LK5A = Code for SC4541 Eyww = Datecode 2 SC4541 Absolute Maximum Ratings Supply IN Voltage(V) . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 26 SW Voltage, OUT Voltage(V) . . . . . . . . . . . . . . . . . -0.3 to 28 FB, Enable Voltage(V) . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN+0.3 ESD Protection Level(1)(kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Recommended Operating Conditions Supply IN Voltage (V) . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 to 22 Maximum Output Voltage (V) . . . . . . . . . . . . . . . . . . . . . . . . 25 Ambient Temperature Range (°C) . . . . . . . . . . . . . -40 to +85 Thermal Information Thermal Resistance, Junction to Ambient(2) MLPD-UT6(°C/W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 SOT23-6(°C/W). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +125 Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150 Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . . +300 Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended. NOTES: (1) Tested according to JEDEC standard JESD22-A114-B. (2) Calculated from package in still air, mounted to 3 x 4.5(in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. Electrical Characteristics VIN =5V, CIN=1uF, COUT=1uF, L=10uH, TA= -40°C to 85°C, unless specified otherwise. Parameter Symbol Conditions Min Typ Max Units Input Voltage Supply Current Shutdown Supply Current EN Logic High Voltage EN Logic Low Voltage EN Logic Bias Current Boost Converter Characteristics VIN 2.9 22 V IIN(Q) VI.


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