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UNISONIC TECHNOLOGIES CO., LTD P2680 Preliminary CMOS IC www.unisonic.com.tw 1 of 5 Copyright © 2014 Unisonic Technologies Co., Ltd QW-R502-A32.b WIDE INPUT 2A SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER  DESCRIPTION The UTC P2680 is a monolithic synchronous step-down, fixed 340kHz frequency, current-mode, PWM controller with an internal power MOSFET. It achieves 2A continuous output current over a wide input supply range from 4V to 26V with excellent load and line regulation. Equipped with an extern al compensation pin, this device offers user flexibility in determining loop dynamic. Current mode control provides fast transient response and cycle-by-cycle current limit. A PWM control circuit can provide the duty ratio from 0 up to 90% linearly. An Under-Voltage-Lock-Output (UVLO) circuit monitors the VIN supply voltage to prevent wrong logic controls. Additional under voltage protections monitor the voltage on FB pin for short-circuit protections. In application, the UTC P2680 is suitable for portable devices when it works as an ideal power supply in SOP-8L package.  FEATURES * 2A Output Current *340KHz frequency of operation * 4V~26V Input Voltage Range * 20μA Shutdown Supply Current * Output Adjustable * Frequency FoldBack at Short Circuit * VIN Under-voltage Lockout * Thermal Shutdown * OCP * Programmable Soft-Start * Up to 90% Efficiency HSOP-8  ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free P2680L-SH2-R P2680G-SH2-R HSOP-8 Tape Reel P2680L-SH2-R (1)Packing Type (2)Package Type (1) R: Tape Reel (2) SH2: HSOP-8 (3) L: Lead Free, G: Halogen Free(3)Lead Free

UNISONIC TECHNOLOGIES CO., LTD 2 of 5 www.unisonic.com.tw Q W - R 5 0 2 - A 3 2 . b  MARKING INFORMATION PACKAGE MARKING HSOP-8  PIN CONFIGURATION BST VIN SW GND FB COMP EN SS  PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION 1 BST Bootstrap pin. Positive su pply for the upper MOSFET driver. 2 V IN Power supply pin. 3 SW Power switch output pin. 4 GND Ground pin. 5 FB The output voltage feedback pin. It is also the inverting input of the error amplifier. 6 COMP Compensation pin. It is also the output of the internal error amplifier. 7 EN Enable Input. A high input at EN turns on the converter, and a low input turns it off. 8 SS Soft-Start pin. Connect a capacitor from SS to GND to set the soft-start period. To disable the soft-start feature, leave SS unconnected.

UNISONIC TECHNOLOGIES CO., LTD 3 of 5 www.unisonic.com.tw Q W - R 5 0 2 - A 3 2 . b  BLOCK DIAGRAM Reference Voltage Source and Bias Current Source EA PWM Current Limit SW GND BST FB 100kHz-340kHz Oscillator COMP 0.923V NMOSS R Q UVLO Short Circuit Signal OTP VIN Driver NMOS EN Slope +SS

UNISONIC TECHNOLOGIES CO., LTD 4 of 5 www.unisonic.com.tw Q W - R 5 0 2 - A 3 2 . b  ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT VIN Supply Voltage V IN 26 V SW Voltage V SW -1~V IN+1 V BST Voltage V BST V SW-0.3~VSW+8 V EN Voltage V EN -0.3~6 V FB Voltage V FB -0.3~6 V COMP Voltage V COMP -0.3~6 V Maximum Power Dissipation P D 0.76 W Junction Temperature T J -40~150 °C Storage Temperature T STG -55~150 °C Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. Exceeding these ratings may damage the device.  RECOMMENDED OPERATING CONDITIONS (Note) PARAMETER SYMBOL RATINGS UNIT Input Voltage V IN 4~26 V Ambient Operating Temperature T A -40 ~ +125 °C Note: The device is not guaranteed to function outside its operating rating.  PACKAGE THERMAL CHARACTERISTICS (Note) PARAMETER SYMBOL RATINGS UNIT Junction to Ambient θJA 105 °C/W Junction to Case θJC 50 °C/W Note: Measured on approximately 1” square of 1 oz. Copper surrounding device leads.  ELECTRICAL CHARACTERISTICS (TA = 25°C, VIN = 12V, unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Input Voltage V IN V OUT= 5V, ILOAD = 0A~1A 7 26 V Feedback Voltage V FB 4.5V ≤ VIN ≤ 23V, VCOMP< 2V 0.900 0.923 0.946 V Switch On Resistance (High-Side) R ONH 0.20 Ω Switch On Resistance (Low-Side) R ONL 0.20 Ω SW Leakage V EN= 0V 0 8 µA Current Limit I LIM 2.4 A Current Limit Gain. Output Current to Comp Pin Voltage 3.3 A/V Error Amplifier Transconductance ∆ICOMP= ±10µA 600 µA/V Error Amplifier Gain 8000 V/V Oscillator Frequency F OSC 305 340 375 kHz Short Circuit Frequency F OSC_S V FB= 0V 100 kHz Maximum Duty Cycle D MAX V FB= 0.7V 90 % Minimum Duty Cycle D MIN V FB= 1.1V 0 % Enable Threshold Voltage V EN Hysteresis = 0.2V 1 V Enable Pull-Up Current I EN V EN = 0V 4.8 µA Supply Current in Shutdown I SD V EN = 0V 110 µA IC Supply Current in Operation I O V EN>2V, VFB= 1.4V 0.9 mA Soft-Start Current V SS = 0V 6 µA Soft-Start Period C SS = 0.1μF 15 ms Thermal Shutdown Temperature T Hysteresis = 10°C 160 °C

Figure 1. Shows an example UTC P2680 application circuit generating a 2.5V/2A output. Note: CC2 is needed for high ESR output capacitor. and reliable and may be changed without notice.