Datasheet ADP2442 (Analog Devices) - 3

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Data Sheet ADP2442 SPECIFICATIONS
VIN = 4.5 V to 36 V, TJ = −40°C to +125°C, unless otherwise noted.
Table 1. Parameter Symbol Test Conditions/Comments Min Typ Max Unit
POWER SUPPLY Input Voltage Range VIN 4.5 36 V Supply Current IVIN VEN = 1.5 V not switching 1.7 2 mA Shutdown Current ISHDN VEN = AGND 10 15 μA UVLO Threshold VUVLO VIN falling 3.8 4 4.2 V Hysteresis 200 mV INTERNAL REGULATOR Regulator Output Voltage VCC VIN = 5 V to 36 V 5 5.5 V OUTPUT Output Voltage Range VOUT 0.6 0.9 × VIN V Maximum Output Current IOUT 1 A Feedback Regulation Voltage VFB TJ = −40°C to +85°C 0.594 0.6 0.606 V TJ = −40°C to +125°C 0.591 0.6 0.609 V Line Regulation 0.005 %/V Load Regulation 0.05 %/A ERROR AMPLIFIER Feedback Bias Current IFB_BIAS VFB = 0.6 V 50 200 nA Transconductance gm ICOMP = ±20 μA 200 250 300 μA/V Open-Loop Voltage Gain1 AVOL 65 dB MOSFETS High-Side Switch On Resistance2 RDS_H(ON) BST − SW = 5 V 170 270 mΩ Low-Side Switch On Resistance2 RDS_L(ON) VCC = 5 V 120 180 mΩ Leakage Current ILKG VEN = AGND 1 25 μA Minimum On Time3 tON_MIN All switching frequencies 50 65 ns Minimum Off Time4 tOFF_MIN 165 175 ns CURRENT SENSE Current Sense Amplifier Gain GCS 1.6 2 2.4 A/V Hiccup Time fSW = 300 kHz to1 MHz 6 ms Number of Cumulative Current-Limit Cycles 8 Events to Enter Hiccup Mode Peak Current Limit ICL 1.4 1.6 1.8 A FREQUENCY Switching Frequency Range fSW 300 1000 kHz Frequency Set Accuracy FREQ pin = 308 kΩ 270 300 330 kHz FREQ pin = 92.5 kΩ 900 1000 1100 kHz Frequency Synchronization Range 300 1000 kHz SOFT START Soft Start Time tSS 2 ms PRECISION ENABLE Input Threshold VEN(RISING) 1.15 1.20 1.25 V Hysteresis VEN(HYST) 100 mV Leakage Current IIEN_LEAK VIN = VEN 0.1 1 μA Thermal Shutdown Rising TSD 150 °C Hysteresis TSD(HYST) 25 °C Rev. B | Page 3 of 36 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL CIRCUIT CONFIGURATION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS EFFICIENCY IN FORCED FIXED FREQUENCY MODE EFFICIENCY IN PULSE SKIP MODE INTERNAL BLOCK DIAGRAM THEORY OF OPERATION CONTROL ARCHITECURE Fixed Frequency Mode Pulse Skip Mode ADJUSTABLE FREQUENCY POWER GOOD MODE OF OPERATION EXTERNAL SYNCHRONIZATION SOFT START UNDERVOLTAGE LOCKOUT PRECISION ENABLE/SHUTDOWN CURRENT-LIMIT AND SHORT-CIRCUIT PROTECTION THERMAL SHUTDOWN APPLICATIONS INFORMATION ADIsimPOWER DESIGN TOOL SELECTING THE OUTPUT VOLTAGE SETTING THE SWITCHING FREQUENCY EXTERNAL COMPONENT SELECTION Input Capacitor Selection Inductor Selection Output Capacitor Selection BOOST CAPACITOR VCC CAPACITOR LOOP COMPENSATION LARGE SIGNAL ANALYSIS OF THE LOOP COMPENSATION DESIGN EXAMPLE CONFIGURATION AND COMPONENTS SELECTION Resistor Divider Switching Frequency Inductor Selection Input Capacitor Selection Output Capacitor Selection Compensation Selection SYSTEM CONFIGURATION TYPICAL APPLICATION CIRCUITS DESIGN EXAMPLE OTHER TYPICAL CIRCUIT CONFIGURATIONS POWER DISSIPATION AND THERMAL CONSIDERATIONS POWER DISSIPATION Inductor Losses Power Switch Conduction Losses Switching Losses Transition Losses THERMAL CONSIDERATIONS EVALUATION BOARD THERMAL PERFORMANCE CIRCUIT BOARD LAYOUT RECOMMENDATIONS OUTLINE DIMENSIONS ORDERING GUIDE