Datasheet ADP1853 (Analog Devices) - 4

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ADP1853 Data Sheet Parameter Symbol Test Conditions/Comments Min Typ Max Unit
LOGIC INPUTS EN EN rising 0.57 0.63 0.68 V EN Hysteresis 0.03 V EN Input Leakage Current IEN VIN = 2.75 V to 20 V 1 200 nA SYNC Logic Input Low 1.3 V SYNC Logic Input High 1.9 V SYNC Input Pull-Down Resistance RSYNC 1 MΩ GATE DRIVERS DH Rise Time CDH = 3 nF, VBST − VSW = 5 V 16 ns DH Fall Time CDH = 3 nF, VBST − VSW = 5 V 14 ns DL Rise Time CDL = 3 nF 16 ns DL Fall Time CDL = 3 nF 14 ns DH to DL Dead Time External 3 nF is connected to DH and DL 25 ns DH or DL Driver RON, Sourcing RON_SOURCE Sourcing 2 A with a 100 ns pulse 2 Ω Current1 Sourcing 1 A with a 100 ns pulse, VIN = 3 V 2.3 Ω DH or DL Driver RON, Tempco TCRON VIN = 3 V or 12 V 0.3 %/oC DH or DL Driver RON, Sinking RON_SINK Sinking 2 A with a 100 ns pulse 1.5 Ω Current1 Sinking 1 A with a 100 ns pulse, VIN = 3 V 2 Ω DH Maximum Duty Cycle1 fOSC = 300 kHz 90 % DH Maximum Duty Cycle1 fOSC = 1500 kHz 50 % Minimum DH On Time fOSC = 200 kHz to 1500 kHz 85 ns Minimum DH Off Time fOSC = 200 kHz to 1500 kHz 345 ns Minimum DL On Time fOSC = 200 kHz to 1500 kHz 295 ns COMP VOLTAGE RANGE COMP Pulse Skip Threshold VCOMP,THRES In pulse skip mode (PSM) 0.9 V COMP Clamp High Voltage VCOMP,HIGH 2.2 V THERMAL SHUTDOWN Thermal Shutdown Threshold TTMSD 155 °C Thermal Shutdown Hysteresis 20 °C OVERVOLTAGE AND POWER GOOD THRESHOLDS FB Overvoltage Threshold VOV VFB rising 0.630 0.65 0.670 V FB Overvoltage Hysteresis 18 mV FB Undervoltage Threshold VUV VFB falling 0.525 0.55 0.575 V FB Undervoltage Hysteresis 15 mV TRK INPUT VOLTAGE RANGE1 0 5 V FB TO TRK OFFSET VOLTAGE TRK = 0.1 V to 0.57 V; offset = VFB − VTRK −10 0 +10 mV SOFT START SS Output Current ISS During startup 4.6 6.5 8.4 µA SS Pull-Down Resistor During a fault condition 3 kΩ FB to SS offset VSS = 0.1 V to 0.6 V; offset = VFB − VSS −10 +10 mV Rev. A | Page 4 of 28 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION SIMPLIFIED BLOCK DIAGRAM PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL ARCHITECTURE OSCILLATOR FREQUENCY SYNCHRONIZATION PWM OR PULSE SKIP MODE OF OPERATION CLKOUT SIGNAL SYNCHRONOUS RECTIFIER AND DEAD TIME INPUT UNDERVOLTAGE LOCKOUT INTERNAL LINEAR REGULATOR OVERVOLAGE PROTECTION POWER GOOD SHORT-CIRCUIT AND CURRENT-LIMIT PROTECTION ENABLE/DISABLE CONTROL THERMAL OVERLOAD PROTECTION INTERLEAVED DUAL-PHASE OPERATION APPLICATIONS INFORMATION ADISIMPOWER DESIGN TOOL SETTING THE OUTPUT VOLTAGE SOFT START SETTING THE CURRENT LIMIT ACCURATE CURRENT-LIMIT SENSING INPUT CAPACITOR SELECTION VIN PIN FILTER BOOST CAPACITOR SELECTION INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION MOSFET SELECTION LOOP COMPENSATION—VOLTAGE MODE Type III Compensation LOOP COMPENSATION—CURRENT MODE Setting the Slope Compensation Setting the Current Sense Gain Type II Compensation SWITCHING NOISE AND OVERSHOOT REDUCTION VOLTAGE TRACKING Coincident Tracking Ratiometric Tracking PCB LAYOUT GUIDLINES TYPICAL OPERATING CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE