UNISONIC TECHNOLOGIES CO., LTD P2680 Preliminary CMOS IC 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 external 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. HSOP-8 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 ORDERING INFORMATION Ordering Number Lead Free P2680L-SH2-R P2680L-SH2-R Halogen Free P2680G-SH2-R Package Packing HSOP-8 Tape Reel (1)Packing Type (1) R: Tape Reel (2)Package Type (2) SH2: HSOP-8 (3)Lead Free (3) L: Lead Free, G: Halogen Free www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd 1 of 5 QW-R502-A32.b P2680 Preliminary CMOS IC MARKING INFORMATION PACKAGE MARKING HSOP-8 PIN CONFIGURATION BST 1 8 SS VIN 2 7 EN SW 3 6 COMP GND 4 5 FB PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 PIN NAME BST VIN SW GND FB COMP EN 8 SS DESCRIPTION Bootstrap pin. Positive supply for the upper MOSFET driver. Power supply pin. Power switch output pin. Ground pin. The output voltage feedback pin. It is also the inverting input of the error amplifier. Compensation pin. It is also the output of the internal error amplifier. Enable Input. A high input at EN turns on the converter, and a low input turns it off. 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 www.unisonic.com.tw 2 of 5 QW-R502-A32.b P2680 Preliminary CMOS IC BLOCK DIAGRAM VIN Reference Voltage Source and Bias Current Source EN + UVLO + + Current Limit Slope BST NMOS S Q 0.923V + SS + EA FB - COMP R + - Driver PWM OTP SW 6 100kHz-340kHz Oscillator NMOS Short Circuit Signal GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R502-A32.b P2680 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT VIN Supply Voltage VIN 26 V SW Voltage VSW -1~VIN+1 V BST Voltage VBST VSW-0.3~VSW+8 V EN Voltage VEN -0.3~6 V FB Voltage VFB -0.3~6 V COMP Voltage VCOMP -0.3~6 V Maximum Power Dissipation PD 0.76 W Junction Temperature TJ -40~150 °C Storage Temperature TSTG -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 Input Voltage VIN Ambient Operating Temperature TA Note: The device is not guaranteed to function outside its operating rating. RATINGS 4~26 -40 ~ +125 UNIT V °C PARAMETER SYMBOL RATINGS Junction to Ambient θJA 105 Junction to Case θJC 50 Note: Measured on approximately 1” square of 1 oz. Copper surrounding device leads. UNIT °C/W °C/W PACKAGE THERMAL CHARACTERISTICS (Note) ELECTRICAL CHARACTERISTICS (TA = 25°C, VIN = 12V, unless otherwise specified.) PARAMETER Input Voltage Feedback Voltage Switch On Resistance (High-Side) Switch On Resistance (Low-Side) SW Leakage Current Limit Current Limit Gain. Output Current to Comp Pin Voltage Error Amplifier Transconductance Error Amplifier Gain Oscillator Frequency Short Circuit Frequency Maximum Duty Cycle Minimum Duty Cycle Enable Threshold Voltage Enable Pull-Up Current Supply Current in Shutdown IC Supply Current in Operation Soft-Start Current Soft-Start Period Thermal Shutdown Temperature SYMBOL TEST CONDITIONS VIN VOUT= 5V, ILOAD = 0A~1A VFB 4.5V ≤ VIN ≤ 23V, VCOMP< 2V RONH RONL VEN= 0V ILIM UNIT V V Ω Ω µA A 3.3 A/V 600 8000 340 100 90 µA/V V/V kHz kHz % % V µA µA mA µA ms °C ∆ICOMP= ±10µA FOSC FOSC_S DMAX DMIN VEN IEN ISD IO T 305 VFB= 0V VFB= 0.7V VFB= 1.1V Hysteresis = 0.2V VEN = 0V VEN = 0V VEN>2V, VFB= 1.4V VSS = 0V CSS = 0.1μF Hysteresis = 10°C UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP MAX 7 26 0.900 0.923 0.946 0.20 0.20 0 8 2.4 375 0 1 4.8 110 0.9 6 15 160 4 of 5 QW-R502-A32.b P2680 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT Figure 1. Shows an example UTC P2680 application circuit generating a 2.5V/2A output. CB 10nF BST VIN VIN EN ON/OFF SS CIN 10µF/35V + L1 10µH/3A UTC GND CSS 0.1µF 2.5V/2A SW RF1 12k COMP VOUT FB CC1 2.2nF RC1 8.2k CC2 (Optional) RF2 13k COUT 22µF/10V Ceramic, or 47µF/6.3 SP Cap Typical Compensation for Different Output Voltages and Output Capacitors VOUT COUT 2.5V 22μF Ceramic 3.3V 22μF Ceramic 5V 22μF Ceramic 2.5V 47μF SP CAP 3.3V 47μF SP CAP 5V 47μF SP CAP 2.5V 470μF/6.3V/30mΩ 3.3V 470μF/6.3V/30mΩ 5V 470μF/6.3V/30mΩ Note: CC2 is needed for high ESR output capacitor. RC1 8.2kΩ 12kΩ 15kΩ 15kΩ 15kΩ 15kΩ 15kΩ 15kΩ 15kΩ CC1 2.2nF 1.5nF 1.5nF 1.5nF 1.8nF 2.7nF 15nF 22nF 27nF CC2 (Note ) None None None None None None 1nF 1nF None UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 5 QW-R502-A32.b