ADP3050-EVAL Analog Devices Inc, ADP3050-EVAL Datasheet
ADP3050-EVAL
Specifications of ADP3050-EVAL
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ADP3050-EVAL Summary of contents
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... Automotive systems Battery chargers GENERAL DESCRIPTION The ADP3050 is a current mode monolithic buck (step down) PWM switching regulator that contains a high current 1 A power switch and all control, logic, and protection functions. It uses a unique compensation scheme allowing the use of any type of output capacitor (tantalum, ceramic, electrolytic, OS-CON) ...
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... ADP3050 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 4 ESD Caution .................................................................................. 4 Pin Configuration and Function Descriptions ............................. 5 Typical Performance Characteristics ............................................. 6 Theory of Operation ...................................................................... 10 Setting the Output Voltage ........................................................ 10 Applications Information .............................................................. 11 Inductor Selection ...................................................................... 11 Output Capacitor Selection ....................................................... 12 REVISION HISTORY 3/08— ...
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... Minimum input voltage is not measured directly, but is guaranteed by other tests. The actual minimum input voltage needed to keep the output in regulation depends on output voltage and load current. Symbol Conditions V Over line and temperature load 100 ADP3050AR only LOAD ADP3050AR-3.3, ADP3050AR-5 I ADP3050AR only VOL COMP = 1 1 1.3 V COMP = 1 ...
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... ADP3050 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter IN Voltage Continuous Peak (<100 ms) BOOST Voltage Continuous Peak (<100 ms) SD, BIAS Voltage FB Voltage COMP Voltage SWITCH Voltage Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range 1 θ (4-Layer PCB) JA θ (4-Layer PCB Lead Temperature (Soldering, 60 sec) 1 Applied to all models that are not Pb-free ...
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... BIAS Bias Input Pin. Connect this pin to the regulated output voltage to maximize system efficiency. When this pin is above 2.7 V, most of the ADP3050 operating current is taken from the output instead of the input supply. Leave unconnected if not used Feedback Pin. This feedback pin senses the regulated output voltage. Connect this pin directly to the output (fixed output versions) ...
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... ADP3050 TYPICAL PERFORMANCE CHARACTERISTICS 5 10V, NO LOAD IN 4.5 4.0 INTO BIAS PIN 3.5 3.0 2.5 2.0 1.5 1.0 INTO IN PIN 0.5 0 –45 –35 –25 –15 – TEMPERATURE (°C) Figure 3. Quiescent Operating Current vs. Temperature SUPPLY VOLTAGE (V) Figure 4. Shutdown Quiescent Current vs. Supply Voltage 10 BIAS TIED TO V ...
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... Figure 12. 3.3 V Output Voltage Change vs. Input Voltage Figure 13. Minimum Input Voltage vs. Load Current 0 –0.02 –0.04 –0.06 –0.08 –0.10 –0.12 –0.14 –0.16 –0. Rev Page ADP3050 = 3.3V OUT I = 100mA LOAD LOAD 10 20 INPUT VOLTAGE ( OUT V = 3.3V OUT 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 ...
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... ADP3050 0 10V IN 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 LOAD CURRENT (A) Figure 15. Switch Saturation Voltage vs. Load Current 210 V = 10V IN 208 I = 250µA LOAD 206 204 202 200 198 196 194 192 190 –45 –35 –25 –15 –5 ...
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... TEMPERATURE (°C) Figure 22. Error Amplifier Transconductance vs. Temperature 57.6 48.0 = 1V/DIV 38.4 28.8 19.2 9.6 0 –9.6 –19.2 –28.8 –38 Rev Page ADP3050 NO LOAD 100 1k 10k 100k 1M FREQUENCY (Hz) Figure 23. Error Amplifier Gain 220 200 180 160 140 120 100 ...
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... 22µF Figure 24. Typical Application Circuit SETTING THE OUTPUT VOLTAGE The output of the adjustable version (ADP3050AR and ADP3050ARZ) can be set to any voltage between 1.25 V and connecting a resistor divider to the FB pin as shown in Figure 25. ⎛ × ⎜ ⎜ − OUT ⎝ ...
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... Designs with a high input voltage or a low load current often operate in discontinuous mode to minimize inductor value and size. The ADP3050 is designed to work well in both modes of operation. Continuous Mode ...
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... They are quite small and inexpensive, and are used successfully in many different applications. OUTPUT CAPACITOR SELECTION The ADP3050 can be used with any type of output capacitor. The trade-offs between price, component size, and regulator performance can be evaluated to determine the best choice for each application ...
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... Make sure the final choice for the output capacitor has been optimized for cost, size, availability, and performance yet still meets the required capacitance. The recommended capacitance is in the 47 μF to 220 μF range. Rev Page ADP3050 ). Typical output ripple voltages range ...
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... Place this capacitor close to the ADP3050 between the IN and GND pins using short, wide traces. This input capacitor should have an rms ripple current rating of at least ...
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... This ringing is usually in the range of several megahertz, and is not harmful to normal circuit operation. SETTING THE OUTPUT VOLTAGE The fixed voltage versions of the ADP3050 (3.3 V and 5 V) have the feedback resistor divider included on-chip. For the adjustable version, the output voltage is set using two external resistors. ...
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... F To deal with this problem, the ADP3050 contains a backup drive stage to get everything started. As the output voltage increases, so does the boost voltage. When the boost voltage reaches approx- imately 2.5 V, the switch drives transition smoothly from the backup driver to the boosted driver ...
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... P 410 mW TOTAL SW BOOST Q The ADP3050 is offered in a thermally enhanced (not Pb-free) 8-lead SOIC package with a thermal resistance, θ and in a standard Pb-free 8-lead SOIC package with θ 87.5°C/W. The maximum die temperature calculated using the J thermal resistance and the maximum ambient temperature ...
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... BOOST and SWITCH traces. TYPICAL APPLICATIONS 3.3 V Buck (Stepdown) Regulator The circuit in Figure 28 shows the ADP3050 in a buck configuration used to generate 3.3 V regulated output from 5 V input voltage with the following specifications ...
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... The equations given in this section are valid for input voltages less than and greater than the output voltage. The voltage seen by the ADP3050 is equal to (18) the sum of the input and output voltages (the BOOST pin sees ⎤ ...
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... C6 in the circuit, but its inclusion greatly improves the regulation of the negative output and lowers the inductor ripple current. The total output current available for both supplies is limited by the ADP3050 (internally limited to around 1.0 A). Keeping load currents below 500 mA and 250 mA, for the positive and negative supplies, respectively, ensures that the current limit is not reached under normal operation ...
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... ADP3050AR-3.3 3.3 V ADP3050AR-3.3-REEL 3.3 V ADP3050AR-3.3-RL7 3.3 V ADP3050AR ADP3050AR-5-REEL 5 V ADP3050AR-5-REEL7 ADP3050ARZ ADJ ADP3050ARZ-RL 2 ADJ 2 ADP3050ARZ-R7 ADJ 2 ADP3050ARZ-3.3 3 ADP3050ARZ-3.3-RL 3 ADP3050ARZ-3.3-RL7 3 ADP3050ARZ ADP3050ARZ-5-REEL ADP3050ARZ-5-REEL7 Operating junction temperature is −40 to +125° RoHS Compliant Part. 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2441) 4.00 (0.1574) 1 5.80 (0.2284) 3 ...
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... ADP3050 NOTES Rev Page ...
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... NOTES Rev Page ADP3050 ...
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... ADP3050 NOTES ©2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00125-0-5/08(B) Rev Page ...