UNISONIC TECHNOLOGIES CO., LTD P1484 LINEAR INTEGRATED CIRCUIT 3A, 18V, 340KHZ SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER DESCRIPTION The UTC P1484 is a synchronous buck regulator. The device provides 3A of continuous load current over a wide input voltage of 5V~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 P1484 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 * 3A 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 P1484G-S08-R Package SOP-8 Packing Tape Reel P1484G-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-R103-060.D P1484 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-R103-060.D P1484 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (Note 1) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN -0.3~+23 V Switch Node Voltage VSW 25 V All Other Pins -0.3~+6 V Continuous Power Dissipation (TA=25°C) (Note 2) PD 1.4 W Junction Temperature TJ 150 °C Storage Temperature TSTG -65~+150 °C Note: 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. The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-to-ambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX)=(TJ (MAX) - TA)/ θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. THERMAL DATA PARAMETER Junction to Ambient Junction to Case Note: Measured on JESD5 1-7, 4-layer PCB RATING 90 45 UNIT °C/W °C/W SYMBOL RATING VIN 6~18 Output Voltage VOUT 0.923~18 Ambient Operating Temperature TOPR -40~+85 Note: The device is not guaranteed to function outside of its operating conditions. UNIT V V °C SYMBOL θJA θJC RECOMMENDED OPERATING CONDITIONS PARAMETER Input Voltage ELECTRICAL CHARACTERISTICS (VIN=12V, TA=+25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS Supply Current VEN=2.0V, VFB=1.0V Feedback Voltage VFB 6V ≤VIN ≤23V High-Side Switch On Resistance (Note 1) RDS(ON)1 Low-Side Switch On Resistance (Note 1) RDS(ON)2 High-Side Switch Leakage Current VEN=0V, VSW=0V Upper Switch Current Limit Minimum Duty Cycle Lower Switch Current Limit From Drain to Source COMP to Current Sense GCS Transconductance Oscillation Frequency FOSC1 Short Circuit Oscillation Frequency FOSC2 VFB=0V Maximum Duty Cycle DMAX VFB=1.0V EN Shutdown Threshold Voltage VEN Rising Input Under Voltage Lockout Threshold VIN Rising Soft-Start Current VSS=0V Thermal Shutdown (Note 1) Note: Guaranteed by design, not tested. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP MAX 3.5 5 0.900 0.923 0.946 70 50 10 3.4 1.1 UNIT mA V mΩ mΩ μA A A 5 A/V 300 0.8 365 40 92 1.2 4 15 160 430 2.0 KHz KHz % V V μA °C 3 of 5 QW-R103-060.D P1484 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT R V 0.923(1 BF 2 ) O R BF 1 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 5 QW-R103-060.D P1484 TYPICAL CHARACTERISTICS SW Wave SCP SW Wave VIN=12V, IO=0A VIN=12V, IO=3A 5V 5V 0 0.1V 0 0.1V 0 0 -0.1V -0.1V 1A 2.5A 0 -1A 0 0 10 20 Time (2μs/div) 0 10 20 Time (2μs/div) Efficiency (%) LINEAR INTEGRATED CIRCUIT 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-R103-060.D