TS1916 1.7A Boost WLED Driver SOT-26 Pin Definition: 1. Switch 2. Ground 3. Feedback 4. Enable 5. OVP 6. VCC General Description The TS1916 is a step-up (Boost) converter designed for driving up to 10 series white LEDs for backlighting application. The TS1916 uses current mode, 1MHz fixed frequency architecture to regulate the LED current, which is set through an external current sense resistor. It’s low feedback voltage reduces power loss and improves efficiency. The OVP pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. The TS1916 includes under-voltage lockout, current limiting and thermal shutdown protection preventing damage in the event of an output overload. Features Application ● 2.5V to 5.5V operating input voltage range ● Digital Still Cameras ● ● ● ● ● ● Drives up to 10 series white LEDs 1MHz fixed switching frequency Wide range for PWM dimming (200Hz to 200kHz) Internal 1.7A switching current limit Over voltage protection (OVP) Internal soft-start function ● ● ● Portable Electronics PDAs and Palm-Top Computers Local Boost Regulator ● ● Current limit and thermal shutdown protection Under voltage lockout Ordering Information Part No. Package Packing TS1916CX6 RFG SOT-26 3kpcs / 7” Reel Note: “G” denotes for Halogen- and Antimony-free as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds Absolute Maximum Ratings Parameter Symbol Limit Unit VCC Pin Voltage VCC -0.3 to 6 V SW Pin Voltage VSW -0.3 to 45 V OVP Pin Voltage VOVP -0.3 to 45 V -0.3 to 6 V PD ( TJ-TA ) / RθJA mW Storage Temperature Range TSTG -65 to +150 °C Operating Junction Temperature Range TOP -40 to +125 °C Thermal Resistance from junction to case RθJC 15 °C/W 40 °C/W EN, FB Pin Voltage Power Dissipation RθJA Thermal Resistance from junction to ambient Note: RθJA is measured with the PCB copper area of approximately 1 in2 (Multi-layer). 1/10 Version: A14 TS1916 1.7A Boost WLED Driver Electrical Specifications (TA=25oC, VIN=5V, IOUT=20mA unless otherwise noted) Characteristics Symbol Conditions Min Typ Max Units Input Voltage Range VCC 2.5 -- 5.5 V Step-Up Voltage Range VOUT 3 -- 40 V OVP Sense Voltage VOVP -- 38 -- V Under Voltage Lockout UVLO -- 2.2 2.4 V -- 100 -- mV VFB 190 200 210 mV Logic-High Voltage VIH 2.0 -- -- V Logic-Low Voltage VIL -- -- 0.4 V -- 200 -- mV Rising UVLO Hysteresis Feedback Voltage EN Threshold EN Hysteresis Operating Quiescent Current Shutdown Current N-Channel MOSFET Current Limit MOSFET On-Resistance (Note) Maximum Duty Cycle (Note) ICCQ IOUT= 0mA, VFB =0.5V -- 300 500 μA ISD VEN=0V, tEN > 20ms -- 1 10 μA ILIM Duty=50% -- 1.7 -- A RDS(on) -- 0.6 1.0 Ω DMAX -- 88 -- % -- 1 -- % Line Regulation VCC = 3V to 5V Switching Frequency f OSC 0.75 1 1.25 MHz Dimming Clock Rate fDIM 0.2 -- 200 kHz VFB = 0.5V -- 0.01 100 nA VLX = 30V, VFB =0.5V -- -- 1 µA IEN-LKG1 VEN= VCC -- 1.5 3 μA IEN-LKG2 VEN= GND -- -- 1 μA ms FB Input Leakage Current SW Leakage Current EN Input Leakage Current IFB-LKG ISWL Shutdown Delay tSHDN -- 10 -- Thermal Shutdown TSD -- 160 -- Thermal Shutdown Hysteresis TSH -- 30 -- °C Note: Guaranteed by design 2/10 Version: A14 TS1916 1.7A Boost WLED Driver Block Diagram VCC EN UVLO Soft Start Enable Logic 10ms OVP Reference 1.238V OV Shutdown Summing Comparator 300mV FB Error Amplifier Thermal Shutdown SW Control and Driver Logic N-MOS Oscillator 1MHz Slope Compensation Current Sense GND Pin Description Pin Number Pin Name 1 2 3 4 5 6 SW GND FB EN OVP VCC Description Switch Output Pin Ground Pin Feedback Pin; Put a Resistor to GND to Setting the Current Enable with Dimming Pin; Internal Pull-Low; Logic High Active OVP Sense Pin Power Input Pin 3/10 Version: A14 TS1916 1.7A Boost WLED Driver Application Circuit For 10 series LED Application with Dimming ILED=VFB/R3, VFB=200mV 4/10 Version: A14 TS1916 1.7A Boost WLED Driver Application Information Setting the ILED Current Application circuit item shows the basic application circuit with TS1916 adjustable output version. The external resistor sets the LED output current according to the following equation: ILED = ( VFB / R3 ) Part No. TS1916 ILED 20mA 350mA R3 10Ω 0.571Ω 4mW 70mW Over Voltage Protection The Over Voltage Protection is detected by a junction breakdown detecting circuit. Once VOUT goes over the detecting voltage, SW pin stops switching and the power N-MOSFET will be turned off. Then, the VOUT will be clamped to be near VOVP. Under Voltage Lockout (UVLO) To avoid mis-operation of the device at low input voltages an under voltage lockout is included that disables the device, if the input voltage falls below (2.25V-100mV). Input Capacitor Selection The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency shall be less than input source impedance to prevent high frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must be used. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. A 4.7µF ceramic capacitor for most applications is sufficient. For a lower output power requirement application, this value can be decreased. Output Capacitor Selection The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The output capacitor must have low impedance at the switching frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their low ESR and high ripple current. A 1µF ceramic capacitors works for most of the applications. Higher capacitor values can be used to improve the load transient response. 5/10 Version: A14 TS1916 1.7A Boost WLED Driver Electrical Characteristics Curve Figure 1. Power On from VIN Figure 2. Power On from EN Figure 3. Steady State Operation Figure 4. Normal Operation Into OVP Figure 5. PWM Dimming From EN (200Hz) Figure 6. PWM Dimming From EN (20Hz) VIN=5V, 4WLEDs, IOUT=150mA VIN=5V, 4WLEDs, IOUT=150mA 6/10 Version: A14 TS1916 1.7A Boost WLED Driver Electrical Characteristics Curve Figure 7. Reference Voltage vs. Input Voltage Figure 9. Quiescent Current vs. Input Voltage Figure 11. LED Current vs. Duty Figure 8. Reference Voltage vs. Temperature Figure 10. Output Voltage vs. Output Current Figure 12. Frequency vs. Temperature 7/10 Version: A14 TS1916 1.7A Boost WLED Driver Electrical Characteristics Curve Figure 13. Frequency vs. Input Voltage Figure 14. Enable Voltage vs. Input Voltage Figure 15. Efficiency vs. Output Current Figure 16. Efficiency vs. Input Voltage 8/10 Version: A14 TS1916 1.7A Boost WLED Driver SOT-26 Mechanical Drawing Unit: Millimeters Marking Diagram JC = Device Code Y = Year Code (4=2014, 5=2015, 6=2016, 7=2017, 8=2018, 9=2019…) W = Week: 01~26 (A~Z) 27~52 (a~z) X = Internal Code 9/10 Version: A14 TS1916 1.7A Boost WLED Driver Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. 10/10 Version: A14