ADP1873ARMZ-0.3-R7 Analog Devices Inc, ADP1873ARMZ-0.3-R7 Datasheet
ADP1873ARMZ-0.3-R7
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ADP1873ARMZ-0.3-R7 Summary of contents
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FEATURES Power input voltage as low as 2. Bias supply voltage range: 2. 5.5 V Minimum output voltage: 0.6 V 0.6 V reference voltage with ±1.0% accuracy Supports all N-channel MOSFET power stages Available ...
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ADP1872/ADP1873 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Typical Applications Circuit ............................................................ 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 Thermal Resistance ...................................................................... 5 Boundary Condition .................................................................... 5 ESD ...
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... J Conditions ADP1872ARMZ-0.3/ADP1873ARMZ-0.3 (300 kHz) ADP1872ARMZ-0.6/ADP1873ARMZ-0.6 (600 kHz) ADP1872ARMZ-1.0/ADP1873ARMZ-1.0 (1.0 MHz μF to PGND 0.22 μF to GND IN IN ADP1872ARMZ-0.3/ADP1873ARMZ-0.3 (300 kHz) ADP1872ARMZ-0.6/ADP1873ARMZ-0.6 (600 kHz) ADP1872ARMZ-1.0/ADP1873ARMZ-1.0 (1.0 MHz 1 switching Q_BST + I COMP/EN < 285 mV BST, SD Rising VDD (See Figure 34 for temperature variation) Falling VDD from operational state ...
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ADP1872/ADP1873 Parameter Symbol OUTPUT DRIVER CHARACTERISTICS High-Side Driver Output Source Resistance Output Sink Resistance Rise Time Fall Time t Low-Side Driver Output Source Resistance Output Sink Resistance 2 Rise Time t 2 Fall Time t Propagation Delays ...
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ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating VDD to GND −0 VIN to PGND −0 +28 V FB, COMP/EN to GND −0 (VDD + 0.3 V) DRVL to PGND −0 ...
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ADP1872/ADP1873 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 VIN High Input Voltage. Connect VIN to the drain of the upper-side MOSFET. 2 COMP/EN Output of the Internal Error Amplifier/IC Enable. When this ...
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TYPICAL PERFORMANCE CHARACTERISTICS 100 V = 5.5V 13V (PSM 5.5V 16.5V (PSM 3.6V 5.5V 5.5V IN ...
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ADP1872/ADP1873 100 V = 5.5V 13V (PSM 5.5V 5.5V 5.5V (PSM 5.5V 16. ...
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13V V 1.791 +125°C +125°C 1.790 +25°C +25°C –40°C –40°C 1.789 0 1500 3000 4500 6000 7500 9000 10,500 12,000 13,500 15,000 ...
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ADP1872/ADP1873 335 V = 5.5V +125°C DD +25°C 325 V = 3.6V DD –40°C 315 305 295 285 275 265 255 245 235 225 10.8 11.0 11.2 11.4 11.6 11.8 12.0 12.2 12.4 12.6 12.8 13.0 13.2 V (V) IN ...
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V = 5.5V +125°C IN 670 +25° 13V IN 640 –40° 16.5V IN 610 580 550 520 490 460 430 400 370 340 310 280 250 220 190 0 2000 4000 6000 8000 10,000 12,000 ...
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ADP1872/ADP1873 2.658 2.657 2.656 2.655 2.654 2.653 2.652 2.651 2.650 2.649 –40 – TEMPERATURE (°C) Figure 34. UVLO vs. Temperature 100 ...
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V = 5.5V 1MHz IN 1200 300kHz V = 13V IN 1120 V = 16.5V IN 1040 960 880 800 720 640 560 480 400 320 240 160 80 2.7 3.1 3.5 3.9 4.3 V (V) DD Figure 40. ...
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ADP1872/ADP1873 OUTPUT VOLTAGE 2 20A STEP CH1 10A Ω CH2 200mV M2ms W CH3 20V CH4 5V T 75.6% Figure 46. Load Transient Step—PSM Enabled (See Figure 91 Application Circuit) OUTPUT VOLTAGE 2 20A ...
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OUTPUT VOLTAGE 1 INDUCTOR CURRENT 2 LOW SIDE 4 SW NODE 3 B CH1 2V CH2 5A Ω M4ms A CH1 W CH3 10V CH4 5V T 49.4% Figure 52. Output Short-Circuit Behavior Leading to Hiccup Mode 1 OUTPUT VOLTAGE ...
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ADP1872/ADP1873 T = 25°C LOW SIDE MINUS SW CH2 5V M40ns CH3 5V CH4 2V T 29.0% MATH 2V 40ns Figure 58. Output Drivers and SW Node Waveforms t 16ns ( LOW SIDE f ...
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ADP1872/ADP1873 BLOCK DIGRAM COMP/EN VDD PRECISION ENABLE BLOCK t BIAS ON BLOCK V DD REF_ZERO PFM SS COMP STATE MACHINE SS_REF ERROR AMP 0.6V PWM I REV COMP V REG CS LOWER AMP COMP CLAMP ...
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ADP1872/ADP1873 THEORY OF OPERATION The ADP1872/ADP1873 are versatile current-mode, synchronous step-down controllers that provide superior transient response, optimal stability, and current limit protection by using a constant on-time, pseudo-fixed frequency with a programmable current- sense gain, current-control scheme. In addition, ...
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PROGRAMMING RESISTOR (RES) DETECT CIRCUIT Upon startup, one of the first blocks to become active is the RES detect circuit. This block powers up before soft start begins. It forces a 0.4 V reference value at the DRVL output (see ...
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ADP1872/ADP1873 Table 6. Valley Current Limit Program Valley Current Level 47 kΩ 22 kΩ Open R ON (mΩ V V 1.5 2 2.5 3 39.0 3.5 33.4 4.5 26.0 5 ...
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SYNCHRONOUS RECTIFIER The ADP1872/ADP1873 employ an internal lower side MOSFET driver to drive the external upper side and lower side MOSFETs. The synchronous rectifier not only improves overall conduction efficiency but also ensures proper charging to the bootstrap capacitor located ...
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ADP1872/ADP1873 VDD INFORMATION R Figure 76. Constant On-Time Timer The constant on-time ( not strictly constant because it varies ON with VIN and V . However, this variation occurs in such a OUT ...
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APPLICATIONS INFORMATION FEEDBACK RESISTOR DIVIDER The required resistor divider network can be determine for a given V value because the internal band gap reference (V OUT is fixed at 0.6 V. Selecting values for R and R T minimum output ...
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ADP1872/ADP1873 Ceramic capacitors are known to have low ESR. However, the trade-off of using X5R technology is that up to 80% of its capaci- tance may be lost due to derating because the voltage applied across the capacitor is increased ...
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EFFICIENCY CONSIDERATION One of the important criteria to consider in constructing a dc-to-dc converter is efficiency. By definition, efficiency is the ratio of the output power to the input power. For high power applications at load currents ...
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ADP1872/ADP1873 Body Diode Conduction Loss The ADP1872/ADP1873 employ anticross conduction circuitry that prevents the upper side and lower side MOSFETs from conducting current simultaneously. This overlap control is beneficial, avoiding large current flow that may lead to irreparable damage to ...
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THERMAL CONSIDERATIONS The ADP1872/ADP1873 are used for dc-to-dc, step down, high current applications that have an on-board controller and on-board MOSFET drivers. Because applications may require load current delivery and be subjected to high ambient ...
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ADP1872/ADP1873 The inductor peak current is approximately × 0.5) = 17.5 A Therefore, an appropriate inductor selection is 1.0 μH with DCR = 3.3 mΩ (7443552100) from Table 7 with peak current handling of 20 ...
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Loss Calculations Duty cycle = 1.8/ 0. 5.4 mΩ ON (N2 (body conduction time) BODY(LOSS 0.84 V (MOSFET forward voltage 3.3 nF (MOSFET gate input capacitance) IN ...
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... The configurations listed in Table 8 are with and a maximum load current The ADP1873 models listed in Table 8 are the PSM versions of the device. Table 8. External Component Values Marking Code SAP Model ADP1872 ADP1872ARMZ-0.3-R7/ LDT ADP1873ARMZ-0.3-R7 LDT LDT LDT LDT LDT LDT LDT LDT LDT LDT ...
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Marking Code SAP Model ADP1872 LDV LDV 1 See the Inductor Selection section (See Ta ble μF Murata 25 V, X7R, 1210 GRM32ER71E226KE15L (3.2 mm × 2.5 mm × 2.5 mm). 3 560 μF Panasonic (SP-series) 2 ...
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ADP1872/ADP1873 LAYOUT CONSIDERATIONS The performance of a dc-to-dc converter depends highly on how the voltage and current paths are configured on the printed circuit board (PCB). Optimizing the placement of sensitive analog and power components are essential to minimize output ...
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SENSITIVE ANALOG COMPONENTS LOCATED FAR FROM THE NOISY POWER SECTION. SEPARATE ANALOG GROUND PLANE FOR THE ANALOG COMPONENTS (THAT IS, COMPENSATION AND FEEDBACK RESISTORS). BYPASS POWER CAPACITOR (C1) FOR VREG BIAS DECOUPLING AND HIGH FREQUENCY CAPACITOR (C2) AS CLOSE AS ...
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ADP1872/ADP1873 Figure 84. Layer 2 of Evaluation Board Rev Page ...
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TOP RESISTOR FEEDBACK TAP VOUT SENSE TAP LINE EXTENDING BACK TO THE TOP RESISTOR IN THE FEEDBACK DIVIDER NETWORK (SEE FIGURE 82). THIS OVERLAPS WITH PGND SENSE TAP LINE EXTENDING BACK TO THE ANALOG PLANE (SEE FIGURE 86, LAYER 4 ...
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ADP1872/ADP1873 BOTTOM RESISTOR TAP TO THE ANALOG GROUND PLANE PGND SENSE TAP FROM NEGATIVE TERMINALS OF OUTPUT BULK CAPACITORS. THIS TRACK PLACEMENT SHOULD BE DIRECTLY BELOW THE VOUT SENSE LINE FROM FIGURE 84. Figure 86. Layer 4 (Bottom Layer) of ...
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IC SECTION (LEFT SIDE OF EVALUATION BOARD) A dedicated plane for the analog ground plane (GND) should be separate from the main power ground plane (PGND). With the shortest path possible, connect the analog ground plane to the GND pin ...
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ADP1872/ADP1873 TYPICAL APPLICATION CIRCUITS DUAL-INPUT, 300 kHz HIGH CURRENT APPLICATION CIRCUIT LOW VOLTAGE INPUT V = 5.0V DD JP1 C C 571pF 57pF 47kΩ R1 30kΩ V OUT R2 15kΩ 0.1µF 1µF Figure 89. ...
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DUAL-INPUT, 300 kHz HIGH CURRENT APPLICATION CIRCUIT LOW VOLTAGE INPUT JP1 C C 800pF 80pF 33.5kΩ R1 30kΩ V OUT R2 15kΩ 0.1µF 1µF Figure 91. Application Circuit for 13 ...
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... Temperature Range ADP1872ARMZ-0.3-R7 −40°C to +125°C ADP1872ARMZ-0.6-R7 −40°C to +125°C ADP1872ARMZ-1.0-R7 −40°C to +125°C ADP1872ARMZ-0.3-EVALZ ADP1872ARMZ-0.6-EVALZ ADP1872ARMZ-1.0-EVALZ ADP1873ARMZ-0.3-R7 −40°C to +125°C ADP1873ARMZ-0.6-R7 −40°C to +125°C ADP1873ARMZ-1.0-R7 −40°C to +125°C ADP1873ARMZ-0.3-EVALZ ADP1873ARMZ-0.6-EVALZ ADP1873ARMZ-1.0-EVALZ RoHS Compliant Part. ...