UNISONIC TECHNOLOGIES CO., LTD P1482 LINEAR INTEGRATED CIRCUIT 2A, 18V, 340KHZ SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER DESCRIPTION The UTC P1482 is a synchronous buck regulator. The device provides 2A of continuous load current over a wide input voltage of 6V~18V. Current mode control provides fast transient response and cycle-bycycle current limit. An adjustable soft-start prevents inrush current at turn-on. The UTC P1482 can provide low-ripple power, high efficiency, and perfect transient characteristics. The duty ratio varies linearly from 0% to 92% in the PWM control. The error amplifier circuit and soft-start circuit included in this device can prevent overshoot at startup. An enable function, an over current protect (OCP) function and short circuit protect (SCP) are also build inside, and when OCP happens, the operation frequency will be reduced. SOP-8 FEATURES * 2A Output Current * Wide 6V~18V Operating Input Range * Integrated Power MOSFET Switches * Programmable Soft-Start * Stable with Low ESR Ceramic Output Capacitors * Fixed 340KHz Frequency * Cycle-by-Cycle Over Current Protection ORDERING INFORMATION Ordering Number P1482G-S08-R Package SOP-8 Packing Tape Reel P1482G-S08-R (1)Packing Type (1) R: Tape Reel (2)Package Type (2) S08: SOP-8 (3)Green Package (3) G: Halogen Free and Lead Free MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 5 QW-R103-057.J P1482 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 PIN NAME NC VIN SW GND FB COMP EN SS DESCRIPTION No Bonding IC power supply pin. Power Switching Output. Ground. Feedback Input. Compensation Node. Enable Input. Soft-Start Control Input. BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R103-057.J P1482 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN -0.3~+18 V Switch Node Voltage VSW 18 V All Other Pins -0.3~+6 V Continuous Power Dissipation PD Internally Limited W Junction Temperature TJ 150 °C Storage Temperature TSTG -65~+150 °C Note: 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. THERMAL DATA PARAMETER SYMBOL Junction to Ambient θJA Note: Surface mounted on 1 in 2 copper pad of FR4 board. RATING 150 UNIT °C/W SYMBOL RATING Input Voltage VIN 6~18 Output Voltage VOUT 0.923~15 Ambient Operating Temperature TOPR -40~+85 Note: The device is not guaranteed to function outside of its operating conditions. UNIT V V °C RECOMMENDED OPERATING CONDITIONS PARAMETER ELECTRICAL CHARACTERISTICS (VIN=12V, TA=25°C, unless otherwise specified) PARAMETER Supply Current Feedback Voltage High-Side Switch On Resistance (Note 1) Low-Side Switch On Resistance (Note 1) High-Side Switch Leakage Current Upper Switch Current Limit Lower Switch Current Limit COMP to Current Sense Transconductance Oscillation Frequency Short Circuit Oscillation Frequency Maximum Duty Cycle EN Shutdown Threshold Voltage Input Under Voltage Lockout Threshold Soft-Start Current Thermal Shutdown (Note) Note: Guaranteed by design, not tested. SYMBOL VFB RDS(ON)1 RDS(ON)2 VEN=0V, VSW=0V Minimum Duty Cycle From Drain to Source MIN TYP MAX 3.5 5 0.900 0.923 0.946 110 100 10 2.4 3.4 1.1 UNIT mA V mΩ mΩ μA A A 5 A/V GCS FOSC1 FOSC2 DMAX UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TEST CONDITIONS VEN=2.0V, VFB=1.0V 6V ≤VIN ≤18V 300 VFB=0V VFB=1.0V VEN Rising VIN Rising VSS=0V 0.7 365 40 92 0.9 4 15 160 430 2.0 KHz KHz % V V μA °C 3 of 5 QW-R103-057.J P1482 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT R V 0.923(1 BF 2 ) O R BF 1 NC SS VIN EN 100k CIN 22µF + V1 - 12 UTC P1482 SW 3.3V/2A CSW option GND 300pF COMP L1 10µH RBF2 26.1k RBF1 10k CSS 0.1µF FB RC 8.2K CO2 3.3n CO1 option COUT 22µF UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 5 QW-R103-057.J P1482 TYPICAL CHARACTERISTICS SCP SW Wave SW Wave VIN=18V VIN=18V, ILOAD=2A 5V 5V 0 0 0 12.5 Time (2.5μs/div) 25 0 50 Time (10μs/div) 100 Efficiency vs. Load Current 100 90 VCC =18V 80 Efficiency (%) LINEAR INTEGRATED CIRCUIT 70 60 VCC =12V VCC =7V 50 40 30 20 0 0.5 1.5 1 Load Current, ILOAD (A) 2 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-R103-057.J