Datasheet ADP1853 (Analog Devices) - 5

Data Sheet ADP1853 Parameter Symbol Test Conditions/Comments Min Typ Max Unit
PGOOD PGOOD Pull-Up Resistor RPGOOD Internal pull-up resistor to VCCO 12.5 kΩ PGOOD Delay 12 µs Overvoltage or Undervoltage This is the minimum duration required to trip 10 µs Minimum Duration the PGOOD signal ILIM Threshold Voltage1 Relative to PGND −5 0 +5 mV ILIM Output Current ILIM = PGND 45 50 55 µA Current Sense Blanking Period After DL goes high, current limit is not sensed 100 ns during this period INTEGRATED RECTIFIER At 20 mA forward current 16 Ω (BOOST DIODE) RESISTANCE ZERO CURRENT CROSS OFFSET In pulse skip mode only; fOSC = 300 kHz 0 2 4 mV (SW TO PGND)1 1 Guaranteed by design. 2 Connect VIN to VCCO when VIN < 5.5 V. Rev. A | Page 5 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