Datasheet ADP5053 (Analog Devices) - 7

Data Sheet ADP5053 Parameter Symbol Min Typ Max Unit Test Conditions/Comments
Error Amplifier (EA), COMP2 Pin EA Transconductance gm2 310 470 620 µS Soft Start Soft Start Time tSS2 2.0 ms SS12 connected to VREG Programmable Soft Start Range 2.0 8.0 ms Hiccup Time tHICCUP2 7 × tSS2 ms COUT Discharge Switch On Resistance RDIS2 250 Ω CHANNEL 3 SYNC BUCK REGULATOR FB3 Pin Fixed Output Options VOUT3 1.20 1.80 V Fuse trim Adjustable Feedback Voltage VFB3 0.800 V Feedback Voltage Accuracy VFB3 (DEFAULT) −0.55 +0.55 % TJ = 25°C −1.25 +1.0 % 0°C ≤ TJ ≤ 85°C −1.5 +1.5 % −40°C ≤ TJ ≤ +125°C Feedback Bias Current IFB3 0.1 µA Adjustable voltage SW3 Pin High-Side Power FET On Resistance RDSON (3H) 225 mΩ Pin-to-pin measurement Low-Side Power FET On Resistance RDSON (3L) 150 mΩ Pin-to-pin measurement Current-Limit Threshold ITH (ILIM3) 1.7 2.2 2.55 A Minimum On Time tMIN_ON3 90 120 ns fSW = 250 kHz to 1.4 MHz Minimum Off Time tMIN_OFF3 1/9 × tSW ns fSW = 250 kHz to 1.4 MHz Error Amplifier (EA), COMP3 Pin EA Transconductance gm3 310 470 620 µS Soft Start Soft Start Time tSS3 2.0 ms SS34 connected to VREG Programmable Soft Start Range 2.0 8.0 ms Hiccup Time tHICCUP3 7 × tSS3 ms COUT Discharge Switch On Resistance RDIS3 250 Ω CHANNEL 4 SYNC BUCK REGULATOR FB4 Pin Fixed Output Options VOUT4 2.5 5.5 V Fuse trim Adjustable Feedback Voltage VFB4 0.800 V Feedback Voltage Accuracy VFB4 (DEFAULT) −0.55 +0.55 % TJ = 25°C −1.25 +1.0 % 0°C ≤ TJ ≤ 85°C −1.5 +1.5 % −40°C ≤ TJ ≤ +125°C Feedback Bias Current IFB4 0.1 µA Adjustable voltage SW4 Pin High-Side Power FET On Resistance RDSON (4H) 225 mΩ Pin-to-pin measurement Low-Side Power FET On Resistance RDSON (4L) 150 mΩ Pin-to-pin measurement Current-Limit Threshold ITH (ILIM4) 1.7 2.2 2.55 A Minimum On Time tMIN_ON4 90 120 ns fSW = 250 kHz to 1.4 MHz Minimum Off Time tMIN_OFF4 1/9 × tSW ns fSW = 250 kHz to 1.4 MHz Error Amplifier (EA), COMP4 Pin EA Transconductance gm4 310 470 620 µS Soft Start Soft Start Time tSS4 2.0 ms SS34 connected to VREG Programmable Soft Start Range 2.0 8.0 ms Hiccup Time tHICCUP4 7 × tSS4 ms COUT Discharge Switch On Resistance RDIS4 250 Ω Rev. C | Page 7 of 37 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY DETAILED FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS BUCK REGULATOR SPECIFICATIONS SUPERVISORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION BUCK REGULATOR OPERATIONAL MODES Pulse-Width Modulation (PWM) Mode Power Save Mode (PSM) Forced PWM and Automatic PWM/PSM Modes ADJUSTABLE AND FIXED OUTPUT VOLTAGES INTERNAL REGULATORS (VREG AND VDD) SEPARATE SUPPLY APPLICATIONS LOW-SIDE DEVICE SELECTION BOOTSTRAP CIRCUITRY ACTIVE OUTPUT DISCHARGE SWITCH PRECISION ENABLING OSCILLATOR Phase Shift SYNCHRONIZATION INPUT/OUTPUT SOFT START PARALLEL OPERATION STARTUP WITH PRECHARGED OUTPUT CURRENT-LIMIT PROTECTION FREQUENCY FOLDBACK Pulse Skip Mode Under Maximum Duty Cycle HICCUP PROTECTION LATCH-OFF PROTECTION Short-Circuit Latch-Off Mode Overvoltage Latch-Off Mode UNDERVOLTAGE LOCKOUT (UVLO) POWER-GOOD FUNCTION THERMAL SHUTDOWN SUPERVISORY CIRCUIT Reset Output Watchdog Input Manual Reset Input Processor Manual Reset Mode Power On/Off Switch Mode APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL PROGRAMMING THE ADJUSTABLE OUTPUT VOLTAGE VOLTAGE CONVERSION LIMITATIONS CURRENT-LIMIT SETTING SOFT START SETTING INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION INPUT CAPACITOR SELECTION LOW-SIDE POWER DEVICE SELECTION PROGRAMMING THE UVLO INPUT COMPENSATION COMPONENTS DESIGN POWER DISSIPATION Buck Regulator Power Dissipation Power Switch Conduction Loss (PCOND) Switching Loss (PSW) Transition Loss (PTRAN) Thermal Shutdown JUNCTION TEMPERATURE DESIGN EXAMPLE SETTING THE SWITCHING FREQUENCY SETTING THE OUTPUT VOLTAGE SETTING THE CURRENT LIMIT SELECTING THE INDUCTOR SELECTING THE OUTPUT CAPACITOR SELECTING THE LOW-SIDE MOSFET DESIGNING THE COMPENSATION NETWORK SELECTING THE SOFT START TIME SELECTING THE INPUT CAPACITOR RECOMMENDED EXTERNAL COMPONENTS CIRCUIT BOARD LAYOUT RECOMMENDATIONS TYPICAL APPLICATION CIRCUITS FACTORY DEFAULT OPTIONS OUTLINE DIMENSIONS ORDERING GUIDE