Datasheet ADP1621 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | Constant-Frequency, Current-Mode Step-Up DC-to-DC Controller |
| 页数 / 页 | 32 / 4 — ADP1621. Data Sheet. SPECIFICATIONS. Table 1. Parameter. Symbol. Test … |
| 文件格式/大小 | PDF / 788 Kb |
| 文件语言 | 英语 |
ADP1621. Data Sheet. SPECIFICATIONS. Table 1. Parameter. Symbol. Test Conditions/Comments. Min. Typ. Max. Unit
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ADP1621 Data Sheet SPECIFICATIONS
VIN = 5 V, RFREQ = 100 kΩ, fOSC = 200 kHz, TJ = −40°C to 125°C, unless otherwise noted.
Table 1. Parameter Symbol Test Conditions/Comments Min Typ Max Unit
MAIN CONTROL LOOP Internal Soft Start Time tSS 2048 Cycles PIN Supply Voltage1 VPIN 2.9 VSHUNT V IN Supply Voltage1 VIN 2.9 VSHUNT V Shunt Regulation Voltage VSHUNT IIN = 3 mA, IPIN = 3 mA, TA = 25°C 5.2 5.4 5.7 V IIN = 3 mA, IPIN = 3 mA 5.0 5.4 6.0 V Shunt Resistance RSHUNT Current into IN = 8 mA to 12 mA 13 Ω Current into PIN = 8 mA to 12 mA 7 Ω IN Quiescent Current IIN VIN = 2.9 V to 5.5 V, VFB = 1.215 V 1.8 3 mA IN Shutdown Current VIN = 2.9 V to 5.5 V, SDSN = GND 1 10 µA PIN Supply Current IPIN Static Mode, No Switching VFB = 1.3 V, VCOMP < VCOMP,ZCT, GATE = 0 V 1 10 µA Shutdown Mode SDSN = GND 1 10 µA Undervoltage Lockout Threshold at VUVLO VUVLO rising 2.2 2.5 2.8 V IN Pin VUVLO hysteresis −80 mV FB Regulation Voltage VFB TA = 25°C 1.203 1.215 1.227 V 1.197 1.215 1.233 V FB Input Current IFB VFB = 1.215 V, TA = 25°C −75 +25 +75 nA Line Regulation2 ∆VFB/∆VIN 2.9 V ≤ VIN ≤ 5 V, TJ = −40°C to +85°C 0.02 0.06 %/V 2.9 V ≤ VIN ≤ 5 V, TJ = −40°C to +125°C 0.02 0.072 %/V Load Regulation3 ∆VFB/∆VCOMP VCOMP = 1.4 V to 1.5 V −1 −0.1 % Error Amplifier Transconductance gm 300 µS COMP Zero-Current Threshold VCOMP,ZCT 0.85 1.0 1.15 V COMP Clamp High Voltage VCOMP,CLAMP TJ = −40°C to +85°C 1.9 2.0 2.1 V TJ = −40°C to +125°C 1.9 2.0 2.2 V Current-Sense Amplifier Gain n 7.5 9.5 11.5 V/V Peak Slope-Compensation Current at ISC,PK VCS = 0 V to 100 mV maximum across RS 55 70 85 µA CS Pin4 (GATE high) CS Pin Leakage Current ICS,LEAK VCS = 30 V (GATE low) 5 µA Shutdown Time tSD SDSN pin from high to low or left floating 50 µs Thermal Shutdown Threshold5 TTMSD 150 °C Thermal Shutdown Hysteresis5 −10 °C OSCILLATOR Oscillator Frequency Range6 fOSC 100 1500 kHz Oscillator Frequency fOSC RFREQ = 65 kΩ, TA = 25°C 255 325 395 kHz Oscillator Frequency Tempco fOSC,TC ±0.06 %/°C SDSN Input Level Threshold VSDSN,THRESH VIN = VPIN = 5 V 1.5 1.7 1.9 V SDSN Threshold Hysteresis −0.19 V SDSN Internal Pull-Down Resistor RSDSN 100 kΩ Synchronization Minimum Pulse Width tSYNC,MIN VSDSN = 0 V to VIN 45 100 ns Synchronization Maximum Pulse Width tSYNC,MAX VSDSN = 0 V to VIN 0.8/fSYNC ns Synchronization Frequency fSYNC 110 1800 kHz GATE Minimum On Time tON,MIN VFB = 1.215 V, VCOMP = 1.0 V 180 215 ns GATE Minimum Off Time tOFF,MIN VFB = 1.215 V, VCOMP = 2.0 V 190 230 ns Maximum Duty Cycle6, 7 DMAX fSW = 200 kHz, RFREQ = 100 kΩ 93 97 % Recommended Maximum fSYNC/fOSC fOSC = 200 kHz, RFREQ = 100 kΩ, fSYNC = fSW 1.1 1.2 1.4 Synchronized Frequency Ratio6, 8 Rev. D | Page 4 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
ADP1621 Data Sheet SPECIFICATIONS
VIN = 5 V, RFREQ = 100 kΩ, fOSC = 200 kHz, TJ = −40°C to 125°C, unless otherwise noted.
Table 1. Parameter Symbol Test Conditions/Comments Min Typ Max Unit
MAIN CONTROL LOOP Internal Soft Start Time tSS 2048 Cycles PIN Supply Voltage1 VPIN 2.9 VSHUNT V IN Supply Voltage1 VIN 2.9 VSHUNT V Shunt Regulation Voltage VSHUNT IIN = 3 mA, IPIN = 3 mA, TA = 25°C 5.2 5.4 5.7 V IIN = 3 mA, IPIN = 3 mA 5.0 5.4 6.0 V Shunt Resistance RSHUNT Current into IN = 8 mA to 12 mA 13 Ω Current into PIN = 8 mA to 12 mA 7 Ω IN Quiescent Current IIN VIN = 2.9 V to 5.5 V, VFB = 1.215 V 1.8 3 mA IN Shutdown Current VIN = 2.9 V to 5.5 V, SDSN = GND 1 10 µA PIN Supply Current IPIN Static Mode, No Switching VFB = 1.3 V, VCOMP < VCOMP,ZCT, GATE = 0 V 1 10 µA Shutdown Mode SDSN = GND 1 10 µA Undervoltage Lockout Threshold at VUVLO VUVLO rising 2.2 2.5 2.8 V IN Pin VUVLO hysteresis −80 mV FB Regulation Voltage VFB TA = 25°C 1.203 1.215 1.227 V 1.197 1.215 1.233 V FB Input Current IFB VFB = 1.215 V, TA = 25°C −75 +25 +75 nA Line Regulation2 ∆VFB/∆VIN 2.9 V ≤ VIN ≤ 5 V, TJ = −40°C to +85°C 0.02 0.06 %/V 2.9 V ≤ VIN ≤ 5 V, TJ = −40°C to +125°C 0.02 0.072 %/V Load Regulation3 ∆VFB/∆VCOMP VCOMP = 1.4 V to 1.5 V −1 −0.1 % Error Amplifier Transconductance gm 300 µS COMP Zero-Current Threshold VCOMP,ZCT 0.85 1.0 1.15 V COMP Clamp High Voltage VCOMP,CLAMP TJ = −40°C to +85°C 1.9 2.0 2.1 V TJ = −40°C to +125°C 1.9 2.0 2.2 V Current-Sense Amplifier Gain n 7.5 9.5 11.5 V/V Peak Slope-Compensation Current at ISC,PK VCS = 0 V to 100 mV maximum across RS 55 70 85 µA CS Pin4 (GATE high) CS Pin Leakage Current ICS,LEAK VCS = 30 V (GATE low) 5 µA Shutdown Time tSD SDSN pin from high to low or left floating 50 µs Thermal Shutdown Threshold5 TTMSD 150 °C Thermal Shutdown Hysteresis5 −10 °C OSCILLATOR Oscillator Frequency Range6 fOSC 100 1500 kHz Oscillator Frequency fOSC RFREQ = 65 kΩ, TA = 25°C 255 325 395 kHz Oscillator Frequency Tempco fOSC,TC ±0.06 %/°C SDSN Input Level Threshold VSDSN,THRESH VIN = VPIN = 5 V 1.5 1.7 1.9 V SDSN Threshold Hysteresis −0.19 V SDSN Internal Pull-Down Resistor RSDSN 100 kΩ Synchronization Minimum Pulse Width tSYNC,MIN VSDSN = 0 V to VIN 45 100 ns Synchronization Maximum Pulse Width tSYNC,MAX VSDSN = 0 V to VIN 0.8/fSYNC ns Synchronization Frequency fSYNC 110 1800 kHz GATE Minimum On Time tON,MIN VFB = 1.215 V, VCOMP = 1.0 V 180 215 ns GATE Minimum Off Time tOFF,MIN VFB = 1.215 V, VCOMP = 2.0 V 190 230 ns Maximum Duty Cycle6, 7 DMAX fSW = 200 kHz, RFREQ = 100 kΩ 93 97 % Recommended Maximum fSYNC/fOSC fOSC = 200 kHz, RFREQ = 100 kΩ, fSYNC = fSW 1.1 1.2 1.4 Synchronized Frequency Ratio6, 8 Rev. D | Page 4 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