SY7201ABC

SY7201 30V High Current Boost LED Driver Preliminary Specification General Description Features SY7201 is a DC/DC step-up converter that delivers an accurate constant current for driving LEDs. Operation at a fixed switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor. The SY7201 is ideal for driving up to eight white LEDs in series or up to 30V. • • • • • • • • Ordering Information SY7201□(□□)□ Applications Temperature Code Package Code Optional Spec Code • GPS Navigation Systems • Handheld Devices • Portable Media Players Temperature Range: -40°C to 85°C Ordering Number SY7201ABC Package type SOT23-6 Input voltage range 2.5 to 30V Switch current limit 2A Drives LED strings up to 30V 1MHz fixed frequency minimizes the external components Internal softstart limits the inrush current Open LED overvoltage protection RoHS Compliant and Halogen Free Compact package: SOT23-6 pin Note 2A Typical Applications L D Vin Vout Cin IN Dimming EN/PWM GND Cout LX OVP FB R1 Figure 1. Schematic Diagram SY7201 Rev. 0.4 Silergy Corp. Confidential- Prepared for Customer Use Only 1 SY7201 Pinout (top view) LX 1 6 IN GND 2 5 OVP FB 3 4 EN/PWM (SOT23-6) Top Mark: DQxyz (Device code: DQ, x=year code, y=week code, z= lot number code) Pin Name LX GND Pin Number 1 2 FB 3 EN/PWM 4 OVP IN 5 6 Pin Description Inductor node. Connect an inductor between IN pin and LX pin. Ground pin. Feedback pin. Connect a resistor R1 between FB and GND to program the output current: IOUT=0.2V/R1. Enable and dimming control. The recommended PWM frequency range should be higher than 20kHz. Over voltage protection. The typical value is 30V. Input pin. Decouple this pin to GND pin with 1uF ceramic capacitor. Absolute Maximum Ratings (Note 1) IN, ------------------------------------------------------------------------------------------------------------------- 32V EN ------------------------------------------------------------------------------------------------------------------- 4V LX, OVP ---------------------------------------------------------------------------------------------------------- 36V All other pins ------------------------------------------------------------------------------------------------------- 4V Power Dissipation, PD @ TA = 25°C, SOT23-6 --------------------------------------------------------------- 0.6W Package Thermal Resistance (Note 2) SOT23-6, θJA -------------------------------------------------------------------------------------------- 200°C/W SOT23-6, θJC -------------------------------------------------------------------------------------------- 130°C/W Junction Temperature Range ------------------------------------------------------------------------------------ 150°C Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C Storage Temperature Range ------------------------------------------------------------------------------------- -65°C to 150°C ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------- 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------- 200V Recommended Operating Conditions (Note 3) Input Voltage Supply----- ---------------------------------------------------------------------------------------- 2.5V to 30V Junction Temperature Range ------------------------------------------------------------------------------------ -40°C to 125°C Ambient Temperature Range ----------------------------------------------------------------------------------- -40°C to 85°C SY7201 Rev. 0.4 Silergy Corp. Confidential- Prepared for Customer Use Only 2 SY7201 Electrical Characteristics (VIN = 3.6V, TA = 25°C, unless otherwise specified) Parameter Input Voltage Range Quiescent Current Shutdown Current Feedback Reference Voltage FB Input Current Low Side Main FET RON Main FET Current Limit EN Rising Threshold EN Falling Threshold Input UVLO Threshold UVLO Hysteresis Oscillator Frequency Min On Time Max Duty Cycle Thermal Shutdown Thermal Hysteresis Output Clamp voltage PWM dimming frequency Symbol VIN IQ ISHDN VREF IFB RDS(ON) ILIM VENH VENL VUVLO VHYS FOSC TSD THYST VOCL Conditions Min 2.5 VFB=0.3V EN=0 196 Typ 0.1 10 200 VFB=0.3V Max 30 0.6 15 204 1 200 2 1.5 0.4 2.4 0.1 1.0 100 90 150 20 30 IOUT=100mA “Open LED” 20k Unit V mA uA mV uA mΩ A V V V V MHz ns % ℃ ℃ V Hz Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2: θ JA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Pin 2 of SOT23-6 packages is the case position for θ JC measurement. Note 3: The device is not guaranteed to function outside its operating conditions. SY7201 Rev. 0.4 Silergy Corp. Confidential- Prepared for Customer Use Only 3 SY7201 SOT23-6 Package outline & PCB layout design 1.90 1.50 - 1.70 1.00 2.70 - 3.00 2.40 2.80 - 3.10 0.95 0.60 0.30 - 0.50 0.01 - 0.1 0.1 - 0.15 0.25 REF Recommended Pad Layout 1.0 - 1.3 0.95 TYP 0.3 - 0.6 1.90 TYP Notes: All dimensions are in millimeters. All dimensions don’t include mold flash & metal burr. SY7201 Rev. 0.4 Silergy Corp. Confidential- Prepared for Customer Use Only 4