Datasheet ADP1828 (Analog Devices) - 3

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Data Sheet ADP1828 SPECIFICATIONS
IN = 12 V, PV = VEN = VTRK = 5 V, SYNC = GND, unless otherwise specified. All limits at temperature extremes are guaranteed via corre- lation using standard statistical quality control (SQC). TJ = −40°C to +125°C, unless otherwise specified. Typical values are at TA = 25°C.
Table 1. Parameter Test Conditions/Comments Min Typ Max Unit
POWER SUPPLY IN Input Voltage PV is tied to VREG, IN is not tied to VREG (using internal regulator) 5.5 20 V IN Input Voltage IN = PV = VREG, IN is tied to VREG (not using internal regulator) 3.0 5.5 V IN Quiescent Current Not switching, IVREG = 0 mA 1.5 3.0 mA IN Shutdown Current EN = GND 5 15 μA VREG-to-GND Shutdown Impedance EN = GND, IN is not tied to VREG 1.6 MΩ VREG Undervoltage Lockout Threshold VREG rising 2.4 2.7 3.0 V VREG Undervoltage Lockout Hysteresis VREG falling 0.125 V ERROR AMPLIFER FB Regulation Voltage TA = 25°C, TRK > 700 mV 597 600 603 mV TA = 0°C to +70°C, TRK > 700 mV 595 605 mV TJ = −40°C to +125°C, TRK > 700 mV 591 609 mV FB Input Bias Current 5 100 nA Open-Loop Voltage Gain 70 dB Gain-Bandwidth Product 20 MHz COMP Sink Current 600 µA COMP Source Current 120 µA COMP Clamp High Voltage IN = VREG = 3 V 2.4 V IN = 12 V 3.6 V COMP Clamp Low Voltage 0.75 V LINEAR REGULATOR VREG Output Voltage IN = 5 V+ dropout voltage to18 V, IVREG = 100 mA 4.75 5.0 5.25 V TJ = −40°C to +125°C VREG Load Regulation IVREG = 0 mA to 100 mA, IN = 5.25 V to 18 V −10 mV VREG Line Regulation IN = 5 V+ dropout voltage to 18 V, no load 1 mV VREG Current Limit VREG drops to 4 V 220 mA VREG Short-Circuit Current VREG drops to 0.4 V 60 140 200 mA IN to VREG Dropout Voltage1 IVREG = 100 mA, IN < 5 V 0.6 1.0 V VREG Minimum Output Capacitance 1 μF PWM CONTROLLER VRAMP Peak-to-Peak Voltage2 0.7 1.0 1.45 V DH Maximum Duty Cycle FREQ = GND (300 kHz) 91 93 % DH Minimum On Time Any frequency 100 ns DL Minimum On Time Any frequency 200 ns SOFT START SS Pull-Up Resistance SS = GND 90 kΩ SS Pull-Down Resistance SS = 0.6 V 6 kΩ SS to FB Offset Voltage SS = 0 mV to 500 mV −45 mV SS Pull-Up Voltage 0.8 V TRACKING TRK Common-Mode Input Voltage Range 0 600 mV TRK to FB Offset Voltage TRK = 0 mV to 500 mV −5.5 +5 mV TRK Input Bias Current 100 nA Rev. E | Page 3 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