TS19371CX6 RFG Taiwan Semiconductor

TS19371CX6 Taiwan Semiconductor Boost (Step-up) WLED Driver with OVP DESCRIPTION FEATURES The TS19371 is a step-up DC/DC converter Inherently Matched LED Current specifically designed to drive white LEDs with a High Efficiency: 89% Typical constant current. The device can drive up to 126 LEDs Drives Up to 9 LEDs Series Vin 9~15V (9S14P) from a 12V supply. The output capacitor can Drives Up to 126 LEDs (9S14P) Vin 12~15V be as small as 4.7F, saving space versus alternative Drives Up to 6 (1W) LEDs Series Vin 12V solutions. A low 95mV feedback voltage minimizes Over Output Voltage Protection 30V power loss for better efficiency. Additional feature Fast 1.2MHz Switching Frequency include over output voltage limiting when LEDs are Requires Only 4.7F Output Capacitor disconnected. The TS19371 switches at a fixed PWM Dimming Control 1kHz to 10kHz Analog Dimming Control frequency of 1.2MHz, allowing the use of tiny, low Compliant to RoHS Directive 2011/65/EU and in profile inductors and capacitors to minimize footprint accordance to WEEE 2002/96/EC. and cost in space consideration applications for Halogen-Free according to IEC 61249-2-21 cellular phone backlighting or other hand held equipment. APPLICATION Cellular Phones Portable Electronics Devices PDA, GPS LCD Display Module White LED Backlighting MR-16 Lighting SOT-26 Pin Definition: 1. SW 2. GND 3. FB 4. CTRL 5. OVP 6. VIN Notes: MSL 1 (Moisture Sensitivity Level) per J-STD-020 TYPICAL APPLICATION CIRCUIT 1 Version: J1708 TS19371CX6 Taiwan Semiconductor (Note 1) ABSOLUTE MAXIMUM RATINGS (T = 25C unless otherwise specified) A PARAMETER SYMBOL LIMIT UNIT Input Voltage V 20 V IN Supply Voltage (Recommended) V 2.5 ~ 18 V IN FB Voltage V 10 V FB SW Voltage V 36 V SW CTRL Voltage V 10 V CTRL C Ambient Temperature Range T -40 to +85 A C Junction Temperature Range T -40 to +125 J (Note 3) THERMAL PERFORMANCE PARAMETER SYMBOL LIMIT UNIT Thermal Resistance Junction to Case R 106 C/W JC Thermal Resistance Junction to Ambient R 220 C/W JA ELECTRICAL SPECIFICATIONS (T = 25C unless otherwise specified) A PARAMETER SYMBOL CONDITION MIN TYP MAX UNIT Input Voltage Range V 2.5 -- 18 V IN Feedback Voltage V I =180mA, V =5V 80 95 110 mV FB SW IN FB Pin Bias Current I 10 45 100 nA B -- 2.1 3.0 mA Supply Current I Q C =0V -- 0.1 1.0 A TRL Switching Frequency F 0.8 1.2 1.6 MHz RSW Switch Current Limit I -- 650 -- mA CL Maximum Duty Cycle D 85 90 -- % TMX Switch V V At I = 250mA -- 350 -- mV CESAT SAT SW Switch Leakage Current I V =5V -- 0.01 5 A LKG SW High 1.5 -- -- V Voltage Enable Control V CTL Low -- -- 0.4 V CTRL Pin Bias Current I C =2V -- 65 -- A CTL TRL Over Voltage Protection OVP -- 30 -- V Note: 1. Absolute maximum ratings are limits beyond which damage to the device may occur. 2. The maximum allowable power dissipation is a function of maximum function temperature, T (max), the junction to ambient J thermal resistance, R , and the ambient temperature. The maximum allowable, power dissipation at any ambient JA temperature is calculated using: PD(MAX)= T (max)-T /R . Exceeding the maximum allowable power dissipation will J A JA cause excessive die temperature. All limits at temperature extremes are guaranteed via correlation using standard statistical methods 2 Version: J1708