P1986

P1986 UTC | Alldatasheet

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UNISONIC TECHNOLOGIES CO., LTD P1986 LINEAR INTEGRATED CIRCUIT w w w . u n i s o n i c . c o m . t w 1 of 6 Copyright © 2011 Unisonic Technologies Co., Ltd QW-R103-046.C 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) f unction 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 Package Packing P1986L-S08-R P1986G-S08-R SOP-8 Tape Reel

P1986 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 6 www.unisonic.com.tw Q W - R 1 0 3 - 0 4 6 . C „ PIN CONFIGURATION FB EN COMP VCC SW SW VSS VSS „ PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION

1 FB Feedback pin

H: normal operation (Step-down) L: Step-down operation stopped (All circuits deactivated)

3 COMP Compensation pin

4 V CC IC power supply pin

5 SW Switch pin. Connect external inductor/diode here. 6 SW Switch pin. Connect external inductor/diode here.

7 V SS GND pin

8 V SS GND pin

P1986 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 6 www.unisonic.com.tw Q W - R 1 0 3 - 0 4 6 . C „ BLOCK DIAGRAM EN COMP VCC SW VSS FB EN VREF PWMSS OSC Driver Current Limit Lateh Reference Voltage

P1986 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 6 www.unisonic.com.tw Q W - R 1 0 3 - 0 4 6 . C „ ABSOLUTE MAXIMUM RATING (Ta=25°C, unless otherwise specified ) PARAMETER SYMBOL RATINGS UNIT VCC Pin Voltage V CC V SS -0.3 ~VSS +30 V Feedback Pin Voltage V FB V SS -0.3 ~ VCC V ON/OFF Pin Voltage V EN V SS - 0.3 ~ VCC+ 0.3 V Switch Pin Voltage V SW V SS - 0.3 ~ VCC+ 0.3 V Operating Supply Voltage V OP +3.6 ~ 28 V Power Dissipation P D Internally limited mW Storage Temperature T STG -40 ~ +150 °C Operating Temperature T OPR -20 ~ +125 °C Note: Absolute maximum ratings are those values beyo nd 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 SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Feedback Voltage V FB I OUT=0.2A 0.784 0.80 0.816 V Feedback Bias Current I FB(BIAS) I OUT=0.1A 0.1 0.5 μA Switch Current I SW Pear current, No outside circuit VFB=0V Force driver on 4 A Standby Current I STN-BY VEN=0V No outside circuit VFB=0V Force driver on 2 10 μA Quiescent Current I Q V FB=1.2V Force driver off 3 5 mA Oscillation Frequency f OSC Measure waveform at SW Pin 260 330 400 KHz Frequency of Current Limit or Short Circuit Protect fOSC1 Measure waveform at SW Pin 40 KHz Line Regulation OUT OUT V VΔ VCC=5V-28V, IOUT=0.2A 0.4 % Load Regulation OUT OUT V VΔ IOUT=0.2A-3A 0.3 % ISH V EN=2.5V(ON) 5 μAEN Pin Input Current ISL V EN=0.3V(OFF) 0 μA Soft-Start Time T SS 0.3 3.5 8 ms VCC=5V,VFB=0V 130 150 m ΩInternal MOSFET RDS(ON) R DS(ON) VCC=12V,VFB=0V 80 100 m Ω VSH High(regulator ON) 1.6 V EN Pin Logic input threshold voltage VSL Low(regulator OFF) 0.8 V Thermal shutdown Temp TSD 140 °C

P1986 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 6 www.unisonic.com.tw Q W - R 1 0 3 - 0 4 6 . C „ TYPICAL APPLICATION CIRCUIT MLCC VCC (V) C1 (nF) C4 ( μF) C7 (nF) C8 ( μF) R3 (KΩ) 7 1 33 2.2 0.1 10.3 12 1 33 2.2 0.1 10.96 19 1 33 10 0.1 5.94

P1986 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 6 www.unisonic.com.tw Q W - R 1 0 3 - 0 4 6 . C „ TYPICAL CHARACTERISTICS Output Voltage (mV) Time (2μs/div) 01 0 2 0 -200 200 Time (10μs/div) 0 50 100 SW SW VCC=19V, VOUT=5V, IOUT=3A VCC=19V, VOUT=0V 100 Load Current, ILOAD (A) Efficiency (%) Efficiency vs. Load Current VCC =7V VCC =12V VCC =19V VOUT =5V 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.