Datasheet ADP1031 (Analog Devices) - 5

Data Sheet ADP1031 Parameter Symbol Min Typ Max Unit Test Conditions/Comments
Feedback Voltage VFB1 0.8 V Feedback Voltage Accuracy −1.5 +1.5 % Adjustable output options Feedback Bias Current IFB1 0.05 µA Load Regulation (ΔVFB1/VFB1)/ΔIOUT1 −0.0005 %/mA IOUT1 = 4 mA to 24 mA, IOUT2 = 10 mA, IOUT3 = −1 mA Line Regulation (ΔVOUT1/VOUT1)/ΔVINP 0.0003 %/V VINP = 16 V to 32 V, IOUT1 = 20 mA, IOUT2 = 10 mA, IOUT3 = −1 mA Power Field Effect Transistor (FET) RON (FLYBACK) 3 Ω SWP current (ISWP) = 100 mA On Resistance Current-Limit Threshold ILIM (FLYBACK) 280 300 320 mA SWP Leakage Current 0.03 0.5 µA SWP voltage (VSWP) = 60 V SWP Capacitance CSWP 50 pF Switching Frequency fSW (FLYBACK) 235 250 265 kHz SYNC = low or high fSYNC/2 kHz SYNC = external clock Minimum On Time 425 ns Minimum Off Time 220 ns Soft Start Timer tSS (FLYBACK) 8 ms Severe Overvoltage Threshold SOVPFLYBACK 29.4 30 30.6 V Flyback regulator stops switching until the overvoltage is removed Severe Overvoltage Hysteresis SOVPFLYBACK_HYST 500 mV BUCK REGULATOR Output Voltage VOUT2 5.15 V ADP1031ACPZ-1, ADP1031ACPZ-4, and ADP1031ACPZ-5 5.0 V ADP1031ACPZ-2 3.3 V ADP1031ACPZ-3 Output Voltage Accuracy −1.5 +1.5 % IOUT2 = 10 mA, applies to all models Load Regulation (ΔVOUT2/VOUT2)/ΔIOUT2 −0.0005 %/mA IOUT2 = 2 mA to 50 mA Line Regulation (ΔVOUT2/VOUT2)/ΔVOUT1 0.0004 %/V VOUT1 = 6 V to 28 V, IOUT2 = 7 mA Power FET On Resistance RON_NFET (BUCK) 1 Ω SW2 current (ISW2) = 100 mA RON_PFET (BUCK) 2.5 Ω ISW2 = 100 mA Current-Limit Threshold ILIM (BUCK) 280 300 320 mA SW2 Leakage Current P Type Metal-Oxide Semiconductor 0.03 0.5 µA VSW2 = 0 V (PMOS) N Type Metal-Oxide Semiconductor 0.03 0.5 µA VSW2 = 28 V (NMOS) Switching Frequency fSW (BUCK) 117.5 125 132.5 kHz SYNC = low or high fSYNC/4 kHz SYNC = external clock Minimum On Time 200 ns Soft Start Timer tSS (BUCK) 8 ms Active Pull-Down Resistor RPD (BUCK) 1.7 kΩ 1.23 V < VOUT1 < 4.5 V INVERTING REGULATOR Output Voltage Range VOUT3 −24 −5 V Feedback Voltage VFB3 0.8 V In reference to VOUT3 Feedback Voltage Accuracy −1.5 +1.5 % Adjustable output option Feedback Bias Current IFB3 0.05 µA Load Regulation (ΔVFB3/VFB3)/ΔIOUT3 −0.01 %/mA IOUT3 = 1 mA to 15 mA Line Regulation (ΔVOUT3/VOUT3)/ΔVOUT1 0.0005 %/V VOUT1 = 6 V to 28 V, IOUT3 = −15 mA Power FET On Resistance RON_NFET (INVERTER) 1.45 Ω SW3 current (ISW3) = 100 mA RON_PFET (INVERTER) 2.2 Ω ISW3 = 100 mA Rev. A | Page 5 of 38 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT COMPANION PRODUCTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS REGULATORY INFORMATION ELECTROMAGNECTIC COMPATIBILITY INSULATION AND SAFETY RELATED SPECIFICATIONS DIN V VDE 0884-10 (VDE V 0884-10) INSULATION CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION FLYBACK REGULATOR Flyback Regulator Operation Power Saving Mode (PSM) Flyback Undervoltage Lockout (UVLO) Flyback Regulator Precision Enable Control Flyback Regulator Soft Start Flyback Slew Rate Control Flyback Regulator Overcurrent Protection Flyback Regulator Overvoltage Protection BUCK REGULATOR Buck Regulator Operation Buck Regulator UVLO Buck Regulator Soft Start Buck Regulator Current-Limit Protection Buck Regulator OVP Buck Regulator Active Pull-Down Resistor INVERTING REGULATOR Inverting Regulator Operation Inverting Regulator UVLO Inverting Regulator Soft Start Inverting Regulator Current-Limit Protection Inverting Regulator OVP Inverting Regulator Active Pull-Down Resistor POWER GOOD POWER-UP SEQUENCE OSCILLATOR AND SYNCHRONIZATION THERMAL SHUTDOWN DATA ISOLATION High Speed SPI Channels GPIO Data Channels APPLICATIONS INFORMATION COMPONENT SELECTION Feedback Resistors Capacitor Selection FLYBACK REGULATOR COMPONENTS SELECTION Input Capacitor Output Capacitor Ripple Current vs. Capacitor Value Schottky Diode Transformer Turn Ratio Primary Inductance Flyback Transformer Saturation Current Series Winding Resistance Leakage Inductance and Clamping Circuits Clamping Resistor Clamping Capacitor Clamping Diode Diode Zener Diode Clamp Ripple Current (IAC) vs. Inductance Maximum Output Current Calculation BUCK REGULATOR COMPONENTS SELECTION Inductor Output Capacitor INVERTING REGULATOR COMPONENT SELECTION Inductor Output Capacitor Inverting Regulator Stability INSULATION LIFETIME Surface Tracking Insulation Wear Out Calculation and Use of Parameters Example THERMAL ANALYSIS TYPICAL APPLICATION CIRCUIT PCB LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE