UNISONIC TECHNOLOGIES CO., LTD P1986 LINEAR INTEGRATED CIRCUIT PWM CONTROL 3A STEP-DOWN CONVERTER DESCRIPTION The UTC P1986 consists of 3A step-down switching regulator with PWM control which includes a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. The UTC P1986 can provide low-ripple power, high efficiency, and perfect transient characteristics. The duty ratio varies linearly from 0% to 100% in the PWM control. The error amplifier circuit and soft-start circuit included in this device can prevent overshoot at startup. Internally, the build-in compensation block can reduce external component count. 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. In application, the UTC P1986 is suitable for portable devices when it works as an ideal power supply in SOP-8L package. There is an internal P-channel power MOS, a coil, capacitors inside and a diode connected externally that makes these ICs step-down switching regulators. FEATURES * Input voltage varies from 3.6V to 28V * Output voltage varies from 0.8V to VCC * Duty ratio varies from 0% to 100% PWM control * With 330kHz typical oscillation frequency * Thermal shutdown and SCP function and soft-start, current limit, enable function * Low ESR output capacitor(Multi-layer chip capacitor) application * Built-in switch P-channel power MOS * Halogen Free ORDERING INFORMATION Ordering Number Lead Free Halogen Free P1986L-S08-R P1986G-S08-R www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd Package Packing SOP-8 Tape Reel 1 of 6 QW-R103-046.C P1986 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION FB 1 8 VSS EN 2 7 VSS COMP 3 6 SW VCC 4 5 SW PIN DESCRIPTION PIN NO. 1 PIN NAME FB 2 EN 3 4 5 6 7 8 COMP VCC SW SW VSS VSS DESCRIPTION Feedback pin Power-off pin H: normal operation (Step-down) L: Step-down operation stopped (All circuits deactivated) Compensation pin IC power supply pin Switch pin. Connect external inductor/diode here. Switch pin. Connect external inductor/diode here. GND pin GND pin UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-046.C P1986 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM EN VCC COMP Reference Voltage Current Limit EN FB SS PWM Lateh Driver SW VREF OSC VSS UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R103-046.C P1986 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (Ta=25°C, unless otherwise specified ) PARAMETER SYMBOL RATINGS UNIT VCC Pin Voltage VCC VSS -0.3 ~VSS +30 V Feedback Pin Voltage VFB VSS -0.3 ~ VCC V ON/OFF Pin Voltage VEN VSS - 0.3 ~ VCC+ 0.3 V Switch Pin Voltage VSW VSS - 0.3 ~ VCC+ 0.3 V Operating Supply Voltage VOP +3.6 ~ 28 V Power Dissipation PD Internally limited mW Storage Temperature TSTG -40 ~ +150 °C Operating Temperature TOPR -20 ~ +125 °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 RATINGS UNIT Junction to Ambient θJA 70 °С/W Junction to Case θJC 25 °С/W Notes: θJA is measured with the PCB copper area(need connect to SW pins) of approximately 1 in2(Multi-layer) ELECTRICAL CHARACTERISTICS (VIN = 12V, Ta= 25°C, unless otherwise specified.) PARAMETER Feedback Voltage Feedback Bias Current Switch Current Standby Current Quiescent Current Oscillation Frequency Frequency of Current Limit or Short Circuit Protect Line Regulation Load Regulation EN Pin Input Current Soft-Start Time Internal MOSFET RDS(ON) EN Pin Logic input threshold voltage Thermal shutdown Temp SYMBOL VFB IFB(BIAS) IQ fOSC TEST CONDITIONS IOUT=0.2A IOUT=0.1A Pear current, No outside circuit VFB=0V Force driver on VEN=0V No outside circuit VFB=0V Force driver on VFB=1.2V Force driver off Measure waveform at SW Pin fOSC1 Measure waveform at SW Pin ISW ISTN-BY ΔVOUT VOUT ΔVOUT VOUT ISH ISL TSS RDS(ON) VSH VSL TSD 4 260 A 2 10 μA 3 330 5 400 mA KHz 40 KHz VCC=5V-28V, IOUT=0.2A 0.4 % IOUT=0.2A-3A 0.3 % VEN=2.5V(ON) VEN=0.3V(OFF) 5 0 3.5 130 80 μA μA ms mΩ mΩ V V °C 0.3 VCC=5V,VFB=0V VCC=12V,VFB=0V High(regulator ON) Low(regulator OFF) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP MAX UNIT 0.784 0.80 0.816 V 0.1 0.5 μA 8 150 100 1.6 0.8 140 4 of 6 QW-R103-046.C P1986 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT MLCC VCC (V) 7 12 19 C1 (nF) 1 1 1 C4 (μF) 33 33 33 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw C7 (nF) 2.2 2.2 10 C8 (μF) 0.1 0.1 0.1 R3 (KΩ) 10.3 10.96 5.94 5 of 6 QW-R103-046.C P1986 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS VCC=19V, VOUT=0V 200 0 -200 VCC=19V, VOUT=5V, IOUT=3A 20 SW 20 SW Output Voltage (mV) 0 0 0 10 20 Time (2μs/div) 0 50 100 Time (10μs/div) Efficiency vs. Load Current 100 VCC =7V Efficiency (%) 90 80 VCC =12V 70 60 VCC =19V 50 VOUT =5V 40 0 0.5 2.0 1.0 1.5 Load Current, ILOAD (A) 2.5 3.0 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 6 of 6 QW-R103-046.C