Datasheet ADP1828 (Analog Devices) - 5

Data Sheet ADP1828 Parameter Test Conditions/Comments Min Typ Max Unit
POWER GOOD FB Overvoltage Threshold VFB rising 700 750 810 mV FB Overvoltage Hysteresis 50 mV FB Undervoltage Threshold VFB falling 500 550 585 mV FB Undervoltage Hysteresis 50 mV PGOOD Propagation Delay 8 μs PGOOD Off Leakage Current VPGOOD = 5.5 V 1 μA PGOOD Output Low Voltage IPGOOD = 10 mA 150 500 mV 1 Connect IN to VREG when IN < 5.5 V. For applications with IN < 5.5V and IN not connected to VREG, keep in mind that VREG = VIN – dropout. VREG must be ≥ 3 V for proper operation. 2 VRAMP = 1.0 V × fOSC/fSW, where fOSC is the natural oscillator frequency and fSW is the actual switching frequency. If SYNC is not used, then fOSC = fSW. If SYNC is used, then fSW = fSYNC. 3 With a 5 V drive, the peak source or sink current can be up to 2.5 A and 3.3 A, respectively, when driving external power MOSFETs. The duration of the peak current pulse is generally in the order of 10 ns. 4 Guaranteed by design and characterization. Not subject to production test. Rev. E | Page 5 of 33 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION SIMPLIFIED BLOCK DIAGRAM PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION INPUT POWER INTERNAL LINEAR REGULATOR SOFT START ERROR AMPLIFIER CURRENT-LIMIT SCHEME MOSFET DRIVERS SETTING THE OUTPUT VOLTAGE SWITCHING FREQUENCY CONTROL AND SYNCHRONIZATION COMPENSATION POWER-GOOD INDICATOR THERMAL SHUTDOWN SHUTDOWN CONTROL TRACKING APPLICATION INFORMATION SELECTING THE INPUT CAPACITOR OUTPUT LC FILTER SELECTING THE MOSFETS SETTING THE CURRENT LIMIT ACCURATE CURRENT-LIMIT SENSING FEEDBACK VOLTAGE DIVIDER COMPENSATING THE VOLTAGE MODE BUCK REGULATOR Type II Compensator Type III Compensator SOFT START SWITCHING NOISE AND OVERSHOOT REDUCTION VOLTAGE TRACKING COINCIDENT TRACKING RATIOMETRIC TRACKING THERMAL CONSIDERATIONS PCB LAYOUT GUIDELINE RECOMMENDED COMPONENT MANUFACTURERS APPLICATION CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE