TS19377 2A Buck (Step-down) WLED Driver SOP-8 Pin D efinition: 1. FB 8. GND 2. EN 7. GND 3. Comp 6. SW 4. Vcc 5. SW General Description TS19377 consists of step-down switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. TS19377 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly from 0 up to 100%. An enable function, an over current protect function and short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced. Also, an internal compensation block is built in to minimum external component count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8 package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter. Features Application Input Voltage Range 3.6V~23V White LED Backlighting Output voltage: 0.25V~Vcc White LED Driving 2A Switch Output Current Multiple LED Driving Duty ratio: 0%~100% PWM control LED Lighting Equipment 330kHz Switching Frequency Enable/Disable Functions Ordering Information Current limit and Thermal Shutdown Part No. Package Packing Short Circuit Protections Built-in Internal SW P-CH MOS TS19377CS RLG SOP-8 2.5Kpcs / 13 Reel Note: G denotes Halogen Free Product. Block Diagram SW Oscillator Reference Voltage Circuit Vcc + PWMSwitched Control Circuit - FB Thermal Shutdown Vss Current Limit V EN Comp EN 1/7 Version: A11 TS19377 2A Buck (Step-down) WLED Driver Absolute Maximum Rating Parameter Symbol Limit Unit V Pin Voltage V V - 0.3 to V + 25 V CC CC SS SS Feedback Pin Voltage V V - 0.3 to V V FB SS CC ON/OFF Pin Voltage V V - 0.3 to V + 0.3 V EN SS CC Switch Pin Voltage V V - 0.3 to V + 0.3 V SW SS CC Power Dissipation PD Internally limited mW Storage Temperature Range T -40 to +150 C ST Operating Temperature Range T -40 to +125 C OP Operating Supply Voltage V +3.6 to +23 V OP Thermal Resistance from Junction to case 25 C/W JC o Electrical Specifications (V =12V, T =25 C, unless otherwise noted) IN A Parameter Symbol Conditions Min Typ Max Units Feedback Voltage V I =0.2A 0.24 0.25 0.26 V FB OUT Quiescent Current I V =1.2V force driver off -- 3 5 mA CCQ FB Feedback Bias Current I I =0.1A -- 0.1 0.5 uA FB OUT Shutdown Supply Current I V =0V -- 2 10 uA SD EN Switch Current I 2.5 -- -- A SW Line Regulation V /V V =5V~23V, I =0.2A -- 1 2 % OUT OUT CC OUT Load Regulation V /V I =0.1 to 2A -- 0.2 0.5 % OUT OUT OUT Oscillation Frequency F 260 330 400 KHz OSC V High (regulator ON) 2.0 -- -- SH EN Pin Logic input threshold voltage V V Low (regulator OFF) -- -- 0.8 SL I V =2.5V (ON) -- 20 -- uA SH EN EN Pin Input Current I V =0.3V (OFF) -- -10 -- uA SL EN V =5V, V =0V -- 100 140 CC FB Internal MOSFET R R m DSON DSON V =12V, V =0V -- 70 100 CC FB I =1A -- 91 -- OUT Efficiency EFFI V = 5V % OUT I =2A -- 91 -- OUT Thermal shutdown Temp T -- 140 -- C SD 2/7 Version: A11