Datasheet ADP5054 (Analog Devices) - 7

Data Sheet ADP5054 Parameter Symbol Min Typ Max Unit Test Conditions/Comments
Soft Start Soft Start Time tSS2 2.0 ms CFG12 connected to ground Programmable Soft Start Range 2.0 16.0 ms Hiccup Time tHICCUP2 7 × tSS1 ms COUT Discharge Switch On Resistance RDIS2 250 Ω CHANNEL 3 SYNC BUCK REGULATOR FB3 Pin 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 RDS(ON)_3H 125 mΩ Pin-to-pin measurement Low-Side Power FET On Resistance RDS(ON)_3L 80 mΩ Pin-to-pin measurement Current-Limit Threshold ITH(ILIM3) 3.5 4.66 5.5 A Minimum On Time tMIN_ON3 95 125 ns fSW = 250 kHz to 2.0 MHz Minimum Off Time tMIN_OFF3 1/9 × tSW ns fSW = 250 kHz to 2.0 MHz Error Amplifier (EA), COMP3 Pin EA Transconductance gm3 310 465 620 μS Soft Start Soft Start Time tSS3 2.0 ms CFG34 connected to ground Programmable Soft Start Range 2.0 16.0 ms Hiccup Time tHICCUP3 7 × tSS3 ms COUT Discharge Switch On Resistance RDIS3 250 Ω CHANNEL 4 SYNC BUCK REGULATOR FB4 Pin 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 SW4 Pin High-Side Power FET On Resistance RDS(ON)_4H 125 mΩ Pin-to-pin measurement Low-Side Power FET On Resistance RDS(ON)_4L 80 mΩ Pin-to-pin measurement Current-Limit Threshold ITH(ILIM4) 3.5 4.66 5.5 A Minimum On Time tMIN_ON4 95 125 ns fSW = 250 kHz to 2.0 MHz Minimum Off Time tMIN_OFF4 1/9 × tSW ns fSW = 250 kHz to 2.0 MHz Error Amplifier (EA), COMP4 Pin EA Transconductance gm4 310 465 620 μS Soft Start Soft Start Time tSS4 2.0 ms CFG34 connected to ground Programmable Soft Start Range 2.0 16.0 ms Hiccup Time tHICCUP4 7 × tSS3 ms COUT Discharge Switch On Resistance RDIS4 250 Ω Rev. G | Page 7 of 31 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY DETAILED FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS BUCK REGULATOR SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION BUCK REGULATOR OPERATIONAL MODES PWM Mode PSM Mode Forced PWM and Automatic PWM/PSM Modes ADJUSTABLE AND FIXED OUTPUT VOLTAGE 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 IN MAXIMUM DUTY SHORT-CIRCUIT PROTECTION (SCP) LATCH-OFF PROTECTION Short-Circuit Latch-Off Mode UNDERVOLTAGE LOCKOUT (UVLO) POWER-GOOD FUNCTION THERMAL SHUTDOWN APPLICATIONS INFORMATION ADIsimPOWER DESIGN TOOL PROGRAMMING THE 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 EXAMPLES 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 PRINTED CIRCUIT BOARD LAYOUT RECOMMENDATIONS TYPICAL APPLICATION CIRCUIT FACTORY DEFAULT OPTIONS OUTLINE DIMENSIONS ORDERING GUIDE