Datasheet ADP1621 (Analog Devices) - 9

Data Sheet ADP1621 45 35 TA = 25°C MOSFET Q 40 G = 25nC VIN = VPIN = 5V t ) 30 R tR OR tF IS FROM ns 35 ( 10% TO 90% OF S mA) THE GATE VOLTAGE 25 ( E 30 tF NT LL TIM 20 25 FA CURRE D Y N L 20 15 P A E UP 15 IS MOSFET QG = 15nC R 10 IN S P TE 10 GA 5 5 MOSFET QG = 7nC 0 0 0 200 400 600 800 1000 1200 1400 1600 1800
010
0 5 10 15 20 25 30 35 40 45 50
013
SWITCHING FREQUENCY (kHz) GATE CAPACITANCE (nF)
06090- 06090- Figure 11. PIN Supply Current vs. Switching Frequency Figure 14. GATE Rise and Fall Times vs. CGATE
2.60 1600 1500 SDSN = 5V 1400 1300 2.55 1200 1100 1000 ) 900 (V) kHz O ( L 2.50 800 UV SC 700 V f O 600 500 2.45 400 300 200 100 2.40 0 –50 0 50 100 150
011
0 20 40 60 80 100 120 140 160 180 200
014
TEMPERATURE (°C) R
06090-
FREQ (kΩ)
06090- Figure 12. VUVLO Threshold vs. Temperature Figure 15. Oscillator Frequency vs. Resistance
198 1.03 T ) V A = 25°C C IN = 5V 197 RFREQ = 100kΩ ,25° C 1.02 S /f O 196 SC f O 1.01 ( ) 195 kHz NCY ( UE 1.00 SC Q f O 194 RE D F 0.99 193 E IZ AL 192 0.98 RM NO 191 0.97 2 3 4 5
015
–50 0 50 100 150
012
VIN (V)
06090-
TEMPERATURE (°C)
06090- Figure 16. Oscillator Frequency vs. V Figure 13. Frequency vs. Temperature IN Rev. D | Page 9 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