Datasheet ADP1872, ADP1873 (Analog Devices) - 3

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Data Sheet ADP1872/ADP1873 SPECIFICATIONS
All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). VDD = 5 V, BST − SW = 5 V, VIN = 13 V. The specifications are valid for TJ = −40°C to +125°C, unless otherwise specified.
Table 1. Parameter Symbol Conditions Min Typ Max Unit
POWER SUPPLY CHARACTERISTICS High Input Voltage Range VIN ADP1872ARMZ-0.3/ADP1873ARMZ-0.3 (300 kHz) 2.75 12 20 V ADP1872ARMZ-0.6/ADP1873ARMZ-0.6 (600 kHz) 2.75 12 20 V ADP1872ARMZ-1.0/ADP1873ARMZ-1.0 (1.0 MHz) 3.0 12 20 V Low Input Voltage Range VDD CIN = 1 µF to PGND, CIN = 0.22 µF to GND ADP1872ARMZ-0.3/ADP1873ARMZ-0.3 (300 kHz) 2.75 5 5.5 V ADP1872ARMZ-0.6/ADP1873ARMZ-0.6 (600 kHz) 2.75 5 5.5 V ADP1872ARMZ-1.0/ADP1873ARMZ-1.0 (1.0 MHz) 3.0 5 5.5 V Quiescent Current IQ_DD + IQ_BST FB = 1.5 V, no switching 1.1 mA Shutdown Current IDD, SD + IBST, SD COMP/EN < 285 mV 140 215 µA Undervoltage Lockout UVLO Rising VDD (See Figure 34 for temperature variation) 2.65 V UVLO Hysteresis Falling VDD from operational state 190 mV SOFT START Soft Start Period See Figure 57 3.0 ms ERROR AMPLIFER FB Regulation Voltage VFB TJ = 25°C 600 mV TJ = −40°C to +85°C 595.5 600 605.4 mV TJ = −40°C to +125°C 594.2 600 606.5 mV Transconductance GM 300 515 730 µs FB Input Leakage Current IFB, LEAK FB = 0.6 V, COMP/EN = released 1 50 nA CURRENT-SENSE AMPLIFIER GAIN Programming Resistor (RES) RES = 47 kΩ ± 1% 2.7 3 3.3 V/V Value from DRVL to PGND RES = 22 kΩ ± 1% 5.5 6 6.5 V/V RES = none 11 12 13 V/V RES = 100 kΩ ± 1% 22 24 26 V/V SWITCHING FREQUENCY Typical values measured at 50% time points with 0 nF at DRVH and DRVL; maximum values are guaranteed by bench evaluation1 ADP1872ARMZ-0.3/ 300 kHz ADP1873ARMZ-0.3 (300 kHz) On-Time VIN = 5 V, VOUT = 2 V, TJ = 25°C 1120 1200 1280 ns Minimum On-Time VIN = 20 V 145 190 ns Minimum Off-Time 84% duty cycle (maximum) 320 385 ns ADP1872ARMZ-0.6/ 600 kHz ADP1873ARMZ-0.6 (600 kHz) On-Time VIN = 5 V, VOUT = 2 V, TJ = 25°C 500 520 580 ns Minimum On-Time VIN = 20 V, VOUT = 0.8 V 82 110 ns Minimum Off-Time 65% duty cycle (maximum) 320 385 ns ADP1872ARMZ-1.0/ 1.0 MHz ADP1873ARMZ-1.0 (1.0 MHz) On-Time VIN = 5 V, VOUT = 2 V, TJ = 25°C 285 312 340 ns Minimum On-Time VIN = 20 V 60 85 ns Minimum Off-Time 45% duty cycle (maximum) 320 385 ns Rev. B | Page 3 of 40 Document Outline Features Applications Typical Applications Circuit General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance Boundary Condition ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics ADP1872/ADP1873 Block Digram Theory of Operation Startup Soft Start Precision Enable Circuitry Undervoltage Lockout Thermal Shutdown Programming Resistor (RES) Detect Circuit Valley Current-Limit Setting Hiccup Mode During Short Circuit Synchronous Rectifier Power Saving Mode (PSM) Version (ADP1873) Timer Operation Pseudo-Fixed Frequency Applications Information Feedback Resistor Divider Inductor Selection Output Ripple Voltage (ΔVRR) Output Capacitor Selection Compensation Network Output Filter Impedance (ZFILT) Error Amplifier Output Impedance (ZCOMP) Error Amplifier Gain (GM) Current-Sense Loop Gain (GCS) Crossover Frequency Efficiency Consideration Channel Conduction Loss MOSFET Driver Loss MOSFET Switching Loss Body Diode Conduction Loss Inductor Loss Input Capacitor Selection Thermal Considerations Design Example Input Capacitor Inductor Current Limit Programming Output Capacitor Feedback Resistor Network Setup Compensation Network Loss Calculations External Component Recommendations Layout Considerations IC Section (Left Side of Evaluation Board) Power Section Differential Sensing Typical Application Circuits Dual-Input, 300 kHz High Current Application Circuit Single-Input, 600 kHz Application Circuit Dual-Input, 300 kHz High Current Application Circuit Outline Dimensions Ordering Guide