Datasheet ADP1621 (Analog Devices) - 10

ADP1621 Data Sheet 250 1.6 VIN = 5V VIN = 5V CS = 30V 1.4 SDSN = 0V 200 A) µ ( 1.2 °C) NT ( 150 1.0 URE CURRE 0.8 RAT N E N I P 100 M W 0.6 E T DO UT H 0.4 50 S 0.2 0 0 –40 10 60 110 160
016
–50 0 50 100 150
019
CS LEAKAGE (nA) TEMPERATURE (°C)
06090- 06090- Figure 17. Temperature vs. CS Leakage Figure 20. Shutdown IN Current vs. Temperature
1.2165 8 VFB = 1.2113V AT 25°C VIN = 5V FB BIAS CURRENT IS MEASURED 1.2160 SDSN = 0V BY FORCING A CONSTANT 1.2113V 4 OVER THE TEMPERATURE RANGE. 1.2155 A) n ( 1.2150 NT 0 ) 1.2145 (V FB CURRE –4 V 1.2140 AS 1.2135 B BI –8 F 1.2130 –12 1.2125 –16 1.2120
7
–50 0 50 100 150 –50 0 50 100 150
020 01 0- 09
TEMPERATURE (°C) TEMPERATURE (°C)
06090- 06 Figure 18. FB Bias Current vs. Temperature Figure 21. FB Voltage vs. Temperature
90 A) (µ 80 TA = 25°C NT VIN = 3.3V E 70 VOUT = 5V LOAD = 0.1A DCM OPERATION 60 N CURR 4 IO CH4 = INDUCTOR CURRENT AT 50 fOSC = 200kHz NS E P 40 M fOSC = 550kHz CO 30 2 E CH2 = DRAIN VOLTAGE P O L 20 AK S 10 E 1 P CH1 = GATE 01.0 1.2 1.4 1.6 1.8 2.0 2.2
18 0 021 90-
CH1 5V CH2 5V M2µs A CH1 2.9V f CH4 500mAΩ SYNC/fOSC
060 6090- 0 Figure 19. Slope-Compensation Current vs. f Figure 22. DCM Switching Waveform SYNC/fOSC Rev. D | Page 10 of 32 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT TABLE OF CONTENTS REVISION HISTORY SIMPLIFIED BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL LOOP CURRENT-SENSE CONFIGURATIONS CURRENT LIMIT UNDERVOLTAGE LOCKOUT SHUTDOWN SOFT START INTERNAL SHUNT REGULATORS SETTING THE OSCILLATOR FREQUENCY AND SYNCHRONIZATION FREQUENCY APPLICATION INFORMATION: BOOST CONVERTER ADIsimPower DESIGN TOOL DUTY CYCLE SETTING THE OUTPUT VOLTAGE INDUCTOR CURRENT RIPPLE INDUCTOR SELECTION INPUT CAPACITOR SELECTION OUTPUT CAPACITOR SELECTION DIODE SELECTION MOSFET SELECTION LOOP COMPENSATION SLOPE COMPENSATION CURRENT LIMIT LIGHT LOAD OPERATION Discontinuous Conduction Mode Pulse-Skipping Modulation RECOMMENDED COMPONENT MANUFACTURERS LAYOUT CONSIDERATIONS EFFICIENCY CONSIDERATIONS EXAMPLES OF APPLICATION CIRCUITS STANDARD BOOST CONVERTER—DESIGN EXAMPLE BOOTSTRAPPED BOOST CONVERTER Low Input and High Output Boost Converter High Input Voltage Boost Converter Circuit SEPIC CONVERTER CIRCUIT LOW VOLTAGE POWER-INPUT CIRCUIT LED DRIVER APPLICATION CIRCUITS RELATED DEVICES OUTLINE DIMENSIONS ORDERING GUIDE