Datasheet ADP1853 (Analog Devices) - 3
| Fabricante | Analog Devices |
| Descripción | Synchronous, Step-Down DC-to-DC Controller with Voltage Tracking and Synchronization |
| Páginas / Página | 28 / 3 — Data Sheet. ADP1853. SPECIFICATIONS. Table 1. Parameter. Symbol. Test … |
| Revisión | A |
| Formato / tamaño de archivo | PDF / 1.2 Mb |
| Idioma del documento | Inglés |
Data Sheet. ADP1853. SPECIFICATIONS. Table 1. Parameter. Symbol. Test Conditions/Comments. Min. Typ. Max. Unit
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Data Sheet ADP1853 SPECIFICATIONS
All limits at temperature extremes 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, VFB = VCCO in forced pulse width 4.2 5.7 mA modulation (PWM) mode (no switching) EN = VIN = 12 V, VFB = VCCO in PSM mode 2.5 mA Shutdown Current IIN_SD EN = GND, 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 TRK Input Bias Current ITRK 0 V ≤ VTRK ≤ 5 V −100 +1 +100 nA CURRENT SENSE AMPLIFIER GAIN ACS Gain resistor connected to DL, 2.6 3 3.4 V/V RCSG = 47 kΩ ± 5% Gain resistor connected to DL, 5.2 6 6.8 V/V RCSG = 22 kΩ ± 5% Default setting, RCSG = open 10.5 12 13.5 V/V Voltage mode operation, resistor DL to PGND, 0 V/V RCSG = 100 kΩ ± 5% OUTPUT CHARACTERICTISTICS 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 to AGND 240 300 360 kHz FREQ 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 GND CSYNC 5 pF CLKOUT Frequency Range1 fCLKOUT fOSC range from 170 kHz to 1725 kHz 170 1725 kHz CLKOUT Pulse Duty Cycle DCLKOUT 50 % CLKOUT Rise and Fall Time CCLKOUT = 47 pF 10 ns 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 Rev. A | Page 3 of 28 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION SIMPLIFIED BLOCK DIAGRAM PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL ARCHITECTURE OSCILLATOR FREQUENCY SYNCHRONIZATION PWM OR PULSE SKIP MODE OF OPERATION CLKOUT SIGNAL SYNCHRONOUS RECTIFIER AND DEAD TIME INPUT UNDERVOLTAGE LOCKOUT INTERNAL LINEAR REGULATOR OVERVOLAGE PROTECTION POWER GOOD SHORT-CIRCUIT AND CURRENT-LIMIT PROTECTION ENABLE/DISABLE CONTROL THERMAL OVERLOAD PROTECTION INTERLEAVED DUAL-PHASE OPERATION 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 GUIDLINES TYPICAL OPERATING CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE
Data Sheet ADP1853 SPECIFICATIONS
All limits at temperature extremes 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, VFB = VCCO in forced pulse width 4.2 5.7 mA modulation (PWM) mode (no switching) EN = VIN = 12 V, VFB = VCCO in PSM mode 2.5 mA Shutdown Current IIN_SD EN = GND, 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 TRK Input Bias Current ITRK 0 V ≤ VTRK ≤ 5 V −100 +1 +100 nA CURRENT SENSE AMPLIFIER GAIN ACS Gain resistor connected to DL, 2.6 3 3.4 V/V RCSG = 47 kΩ ± 5% Gain resistor connected to DL, 5.2 6 6.8 V/V RCSG = 22 kΩ ± 5% Default setting, RCSG = open 10.5 12 13.5 V/V Voltage mode operation, resistor DL to PGND, 0 V/V RCSG = 100 kΩ ± 5% OUTPUT CHARACTERICTISTICS 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 to AGND 240 300 360 kHz FREQ 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 GND CSYNC 5 pF CLKOUT Frequency Range1 fCLKOUT fOSC range from 170 kHz to 1725 kHz 170 1725 kHz CLKOUT Pulse Duty Cycle DCLKOUT 50 % CLKOUT Rise and Fall Time CCLKOUT = 47 pF 10 ns 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 Rev. A | Page 3 of 28 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION SIMPLIFIED BLOCK DIAGRAM PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL ARCHITECTURE OSCILLATOR FREQUENCY SYNCHRONIZATION PWM OR PULSE SKIP MODE OF OPERATION CLKOUT SIGNAL SYNCHRONOUS RECTIFIER AND DEAD TIME INPUT UNDERVOLTAGE LOCKOUT INTERNAL LINEAR REGULATOR OVERVOLAGE PROTECTION POWER GOOD SHORT-CIRCUIT AND CURRENT-LIMIT PROTECTION ENABLE/DISABLE CONTROL THERMAL OVERLOAD PROTECTION INTERLEAVED DUAL-PHASE OPERATION 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 GUIDLINES TYPICAL OPERATING CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE