UNISONIC TECHNOLOGIES CO., LTD P1484A LINEAR INTEGRATED CIRCUIT 3A, 23V, 340KHZ SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER DESCRIPTION The UTC P1484A is a synchronous buck regulator. The device provides3A of continuous load current over a wide input voltage of 5V~23V. Current mode control provides fast transient response and cycle-bycycle current limit. An adjustable soft-start prevents inrush current at turn-on The UTC P1484A 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. HSOP-8 FEATURES * 3A Output Current * Wide 6V~23V 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 P1484AG-SH2-R Package HSOP-8 Packing Tape Reel P1484AG-SH2-R (1)Packing Type (1) R: Tape Reel (2)Package Type (2) SH2: HSOP-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-R103-063.C P1484A 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-R103-063.C P1484A 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 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. 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 PARAMETER SYMBOL RATING Input Voltage VIN 6~23 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 ELECTRICAL CHARACTERISTICS (VIN=12V, TA=+25°C, unless otherwise specified) PARAMETER Supply Current Feedback Voltage High-Side Switch On Resistance (Note) Low-Side Switch On Resistance (Note) 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 TEST CONDITIONS VEN=2.0V, VFB=1.0V 6V ≤VIN ≤23V VEN=0V, VSW=0V Minimum Duty Cycle From Drain to Source TYP MAX UNIT 3.5 5 mA 0.900 0.923 0.946 V 70 mΩ 50 mΩ 10 μA 3.4 A 1.1 A GCS FOSC1 FOSC2 DMAX 5 300 VFB=0V VFB=1.0V VEN Rising VIN Rising VSS=0V UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 0.8 365 40 92 1.2 4 15 160 A/V 430 2.0 KHz KHz % V V μA °C 3 of 5 QW-R103-063.C P1484A 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-R103-063.C P1484A 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-R103-063.C