Datasheet ADP1851 (Analog Devices) - 4

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ADP1851 Data Sheet SPECIFICATIONS
All limits at temperature extremes, TJMIN and TJMAX, are guaranteed via correlation using standard statistical quality control (SQC). VIN = 12 V. The specifications are valid for TJ = −40°C to +125°C, unless otherwise specified. Typical values are at TA = 25°C.
Table 1. Parameter Symbol Test Conditions/Comments Min Typ Max Unit
POWER SUPPLY Input Voltage VIN 2.75 20 V Undervoltage Lockout Threshold UVLOTRSH VIN rising 2.55 2.65 2.75 V VIN falling 2.35 2.45 2.50 V Undervoltage Lockout Hysteresis UVLOHYST 0.2 V Quiescent Current IIN EN = VIN = 12 V, VCOMP = 0.6 V in forced pulse- 4.2 5.7 mA width modulation (PWM) mode (not switching), SYNC = VCCO EN = VIN = 12 V, VCOMP = 0.6 V in PSM mode, 2.5 mA SYNC = AGND Shutdown Current IIN_SD EN = AGND, VIN = 5.5 V or 20 V 100 200 µA ERROR AMPLIFIER FB Input Bias Current IFB −100 +1 +100 nA Open-Loop Gain1 80 dB Gain Bandwidth Product1 20 MHz CURRENT SENSE AMPLIFIER GAIN ACS Current sense gain resistor connected 2.6 3 3.4 V/V between DL and PGND, RCSG = 47 kΩ ± 5% Current sense gain resistor connected 5.2 6 6.8 V/V between DL and PGND, RCSG = 22 kΩ ± 5% Default setting, RCSG = open 10.5 12 13.5 V/V Voltage mode operation, resistor connected 0 V/V between DL and PGND, RCSG = 100 kΩ ± 5% OUTPUT CHARACTERISTICS Feedback Accuracy Voltage VFB TJ = −40°C to +85°C 597 600 603 mV TJ = −40°C to +125°C 594 600 606 mV Line Regulation of PWM VFB/VIN ±0.015 %/V Load Regulation of PWM1 VFB/VCOMP VCOMP range = 0.9 V to 2.2 V ±0.3 % OSCILLATOR Frequency fOSC RFREQ = 332 kΩ to AGND 170 200 230 kHz RFREQ = 78.7 kΩ to AGND 720 800 880 kHz RFREQ = 40.2 kΩ to AGND 1275 1500 1725 kHz FREQ connected to AGND 240 300 360 kHz FREQ connected to VCCO 480 600 720 kHz SYNC Input Frequency Range1 fSYNC RFREQ range from 332 kΩ to 40.2 kΩ 170 1725 kHz SYNC Input Pulse Width1 tSYNCMIN 100 ns SYNC Pin Capacitance to AGND CSYNC 5 pF LINEAR REGULATOR VCCO Output Voltage IVCCO = 100 mA 4.7 5.0 5.3 V VCCO Load Regulation IVCCO = 0 mA to 100 mA 35 mV VCCO Line Regulation VIN = 5.5 V to 20 V, IVCCO = 20 mA 10 mV VCCO Current Limit1 VCCO drops to 4 V from 5 V 350 mA VCCO Short-Circuit Current1 VCCO < 0.5 V 370 400 mA VIN to VCCO Dropout Voltage2 VDROPOUT IVCCO = 100 mA, VIN ≤ 5 V 0.33 V LOGIC INPUTS EN Threshold Voltage 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 Rev. B | Page 4 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL OPERATION CIRCUIT REVISION HISTORY SIMPLIFIED BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL ARCHITECTURE OSCILLATOR FREQUENCY SYNCHRONIZATION PWM AND PULSE SKIP MODES OF OPERATION SYNCHRONOUS RECTIFIER AND DEAD TIME INPUT UNDERVOLTAGE LOCKOUT INTERNAL LINEAR REGULATOR OVERVOLTAGE PROTECTION POWER GOOD SHORT-CIRCUIT AND CURRENT-LIMIT PROTECTION ENABLE/DISABLE CONTROL THERMAL OVERLOAD PROTECTION 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 GUIDELINES TYPICAL OPERATING CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE