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SR2803 Dataheets PDF



Part Number SR2803
Manufacturers UTC
Logo UTC
Description 3A SYNCHRONOUS BUCK CONTROLLER
Datasheet SR2803 DatasheetSR2803 Datasheet (PDF)

UNISONIC TECHNOLOGIES CO., LTD SR2803 330KHZ, 3A SYNCHRONOUS BUCK CONTROLLER „ DESCRIPTION LINEAR INTEGRATED CIRCUIT The UTC SR2803 is a synchronous buck regulator. The device provides 3A of continuous load current over a wide input voltage of 4V~28V. Current mode control provides fast transient response and cycle by cycle current limit. Integrates soft start, and shutdown mode. The UTC SR2803 can provide low-ripple power, high efficiency, and perfect transient characteristics. The duty ratio .

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UNISONIC TECHNOLOGIES CO., LTD SR2803 330KHZ, 3A SYNCHRONOUS BUCK CONTROLLER „ DESCRIPTION LINEAR INTEGRATED CIRCUIT The UTC SR2803 is a synchronous buck regulator. The device provides 3A of continuous load current over a wide input voltage of 4V~28V. Current mode control provides fast transient response and cycle by cycle current limit. Integrates soft start, and shutdown mode. The UTC SR2803 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. „ FEATURES * Input voltage varies from 4V ~ 28V * Output voltage varies from 0.8V to VCC * Duty ratio varies from 0% to 92% 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 * Halogen Free „ ORDERING INFORMATION Ordering Number Lead Free Halogen Free SR2803L-S08-R SR2803G-S08-R Package SOP-8 Packing Tape Reel www.unisonic.com.tw Copyright © 2012 Unisonic Technologies Co., Ltd 1 of 6 QW-R103-056.A Free Datasheet http://www.Datasheet4U.com SR2803 „ PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT „ PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 PIN NAME FB EN 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 here. Switch pin. Connect external inductor here. GND pin GND pin UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-056.A Free Datasheet http://www.Datasheet4U.com SR2803 „ BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT VCC Current Source Bias SENSE Driver PWM LATCH Dead Time Control EN Start Up REF_2.5V REF_0.8V OSC FB EA SLOPE PWM SW Driver SS COMP GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R103-056.A Free Datasheet http://www.Datasheet4U.com SR2803 „ LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified ) PARAMETER SYMBOL RATINGS UNIT VCC Pin Voltage VCC VSS -0.3 ~VSS +28 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 +4 ~ 28 V Power Dissipation PD Internally limited 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 Note: 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.) SYMBOL VFB IFB(BIAS) ISW ISTN-BY IQ fOSC fOSC1 ΔVOUT VOUT ΔVOUT VOUT 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 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 Measure waveform at SW Pin VCC=5V-28V, IOUT=0.2A IOUT=0.2A-3A VEN=2.5V(ON) VEN=0.3V(OFF) MIN TYP MAX UNIT 0.784 0.80 0.816 V 0.1 0.5 μA 3.5 2 260 20 3 330 40 0.4 0.3 5 0 3.5 70 50 10 5 400 A μA mA KHz KHz % % μA μA ms mΩ mΩ V V °C ISH ISL TSS RDS(ON) VSH VSL TSD 0.3 High-side Switch, ISW=1A low-side Switch, ISW=1A High(regulator ON) Low(regulator OFF) 8 1.6 0.8 150 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R103-056.A Free Datasheet http://www.Datasheet4U.com SR2803 „ TYPICAL APPLICATION CIRCUIT MLCC LINEAR INTEGRATED CIRCUIT FB VSS EN VSS 100k COMP Rc 10k Co2 10n + V5 - 12 VCC Cin 22µF SW L4 10µH Cout 22µF Rbf2 6.8K Rbf1 1.3K 5V/3A SW Co1 51P UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R103-056.A Free Datasheet http://www.Datasheet4U.com SR2803 „ TYPICAL CHARACTERISTICS Short Protect SW Wave VIN=19V, VOUT=5V, ILOAD=3A LINEAR INTEGRATED CIRCUIT Short Protect SW Wave VIN=19V, VOUT=0V 5V 0 0 12.5 Time (2.5μs/div) 25 5V 0 0 125 Time (25μs/div) 250 Efficiency (%) UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, .


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