ADP2442-EVALZ Analog Devices, ADP2442-EVALZ Datasheet
ADP2442-EVALZ
Specifications of ADP2442-EVALZ
Related parts for ADP2442-EVALZ
ADP2442-EVALZ Summary of contents
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... Other key features include input undervoltage lockout (UVLO), thermal shutdown (TSD), and precision enable (EN), which can also be used as a logic level shutdown input. The ADP2442 package and is rated for a junction temperature range from −40°C to +125°C. ADP2442 has 100 ...
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... ADP2442 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Typical Circuit Configuration ......................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 Thermal Resistance ...................................................................... 5 ESD Caution .................................................................................. 5 Pin Configuration and Function Descriptions ............................. 6 Typical Performance Characteristics ............................................. 7 Efficiency in Forced Fixed Frequency Mode ............................ 7 Efficiency in Pulse Skip Mode .................................................... 8 Internal Block Diagram ................................................................. 15 Theory of Operation ...................................................................... 16 Control Architecure ...
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... OFF_MIN 300 kHz to1 MHz FREQ pin = 308 kΩ FREQ pin = 92.5 kΩ EN(RISING) V EN(HYST IEN_LEAK SD(HYST) Rev Page ADP2442 Min Typ Max Unit 4 1 µA 3.8 4 4.2 V 200 mV 5 5.5 V 0.6 0.9 × ...
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... ADP2442 Parameter POWER GOOD PGOOD High, FB Rising Threshold 5 5 PGOOD Low, FB Rising Threshold PGOOD High, FB Falling Threshold 5 5 PGOOD Low, FB Falling Threshold PGOOD Delay High Leakage Current Pull-Down Resistor SYNC/MODE SYNC/MODE Input Logic High Logic Low Pulse Width 1 Guaranteed by design. 2 Measured between VIN and SW pins and includes bond wires and pin resistance. ...
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... Table 3. Thermal Resistance −0 +45 V Package Type −0 12-Lead LFCSP −0 −0 ESD CAUTION ±0.3 V −40°C to +125°C −65°C to +150°C 260°C Rev Page ADP2442 θ θ Unit 2.4 °C/W ...
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... PGND. The VCC output is active when the EN pin voltage is more than 0 AGND Analog Ground. This pin is the internal ground for the control functions. Connect this pin to the exposed pad. EP Exposed Pad. Connect the exposed pad to the system AGND plane and PGND plane VIN ADP2442 COMP SW 2 TOP 8 VIEW ...
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... Figure 8. Efficiency vs. Load Current OUT 100 V = 24V 36V 0.01 0.1 LOAD (A) Figure 9. Efficiency vs. Load Current OUT ADP2442 = 12V V = 3.3V OUT f = 700kHz 700 kHz OUT f = 700kHz 700 kHz SW = 12V OUT = 600kHz 600 kHz SW ...
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... ADP2442 EFFICIENCY IN PULSE SKIP MODE 100 24V 3.3V 30 OUT f = 300kHz SW 20 COILCRAFT MSS1038 10 0 0.01 0.1 LOAD (A) Figure 10. Efficiency vs. Load Current 3 300 kHz OUT SW 100 24V OUT f = 300kHz ...
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... OUT (V) IN Figure 20. Pulse Skip Threshold Load Current, V 300 250 f = 300kHz SW 200 150 f = 600kHz SW 100 12V OUT (V) IN Figure 21. Pulse Skip Threshold Load Current, V ADP2442 3.3 V OUT OUT OUT ...
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... ADP2442 36V 4. – TEMPERATURE (°C) Figure 22. Shutdown Current vs. Temperature 4.5 4.4 UVLO, RISING V 4.3 IN 4.2 4.1 UVLO, FALLING V IN 4.0 3.9 –50 – TEMPERATURE (°C) Figure 23. UVLO Threshold vs. Temperature 2.25 2.05 1.85 1.65 1. 4.5V 1. 12V IN 1. 24V IN 0. 36V IN 0.65 0.45 0.25 0.05 –50 –30 – TEMPERATURE (° ...
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... TEMPERATURE (°C) Figure 32. Low-Side R vs. Temperature DS(ON) V OUT INDUCTOR CURRENT V = 24V OUT f = 700kHz SW NO LOAD SYNC/MODE = AGND SW B CH1 20.0mV CH2 10.0V M4.00µs A CH4 W 200mA Ω CH4 T 50.40 700 kHz, No Load, IN OUT SW SYNC/MODE = AGND ADP2442 150 130 150 116mA ...
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... ADP2442 V OUT 1 INDUCTOR CURRENT 24V OUT f = 700kHz CH1 20.0mV CH2 10.0V M1.00µs A CH4 W 500mA Ω B CH4 W T 50.40% Figure 34. PWM Mode 700 kHz, Load = No Load, SYNC/MODE = VCC IN OUT SW V OUT 1 INDUCTOR CURRENT LOAD = 5Ω 24V ...
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... LOAD = 5Ω 36V SYNC/MODE = VCC OUT f = 700kHz SW V OUT SW B CH1 2.00V CH2 10.0V M2.00ms A CH3 W B CH3 10.0V T 7.80 PWM Mode OUT Load = 5 Ω, SYNC/MODE = VCC ADP2442 2.80V = 700 kHz SW 6.00V = 5 V, OUT 6.00V = 700 kHz, SW ...
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... ADP2442 OUT CH1 2.00V CH2 20.0V M400µ CH3 10.0V T 41.80% W Figure 46. Shutdown with V , PWM Mode 700 kHz, Load = 5 Ω, SYNC/MODE = VCC OUT OUT LOAD SYNC/MODE = 700kHz CH1 2.00V CH2 10.0V M1.00ms W B CH3 5.00V T 9 ...
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... COMP 1V THRESHOLD CONTROL LOGIC PWM PWM COMPARATOR HICCUP HICCUP TIMER CURRENT SENSE CURRENT 115% OF LIMIT COMPARATOR FEEDBACK REFERENCE CURRENT V FB 86% OF FEEDBACK Figure 51. Internal Block Diagram Rev Page ADP2442 AGND BST POWER STAGE NMOS SW VCC NMOS PGND – + AMPLIFIER PGOOD ...
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... Fixed Frequency Mode A basic block diagram of the control architecture is shown in Figure 52. The ADP2442 can be configured in fixed frequency mode. The output voltage sensed on the feedback pin, OUT FB. An error amplifier integrates the error between the feedback ...
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... If a resistor divider is not used, apply a logic signal instead. A logic high enables the device, and a logic low forces the part into shutdown mode. Rev Page ADP2442 is synchronized to an has an internal soft start feature that allows the ADP2442 24V INTERNAL SS TIME 3 IN ...
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... A 25°C hysteresis is included so that when a thermal shutdown occurs, the ADP2442 does not return to normal operation until the junction temperature drops below 125°C. Soft start is active upon each restart cycle. ...
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... R FREQ Table 7 and Figure 59 provide examples of frequency resistor values that are based on the switching frequency. Table 7. Frequency Resistor Selection R (1) FREQ 308 kΩ 132 kΩ 92.5 kΩ follows: TOP (2) Rev Page ADP2442 R (kΩ) R TOP BOTTOM 190 ...
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... A (30% of the maximum load of 1 A), eliminating the need for an external ramp resistor. For the ADP2442, choose an inductor such that the peak-to- peak ripple current of the inductor is between 0.2 A and 0.5 A for stable operation. Calculate the inductor value as follows: 0.2 A ≤ ...
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... L is the allowable peak-to-peak output voltage ripple. 3 ≅ ∆ × I OUT MIN OUT STEP ( ) ( ) × ∆ SW DROOP is the load step. is the maximum allowable output voltage droop/overshoot. ADP2442 (11) ) (12) ) (13) ...
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... BOOST CAPACITOR The boost pin (BST) is used to power up the internal driver for the high-side power MOSFET. In the ADP2442, the high-side power MOSFET is an N-channel device to achieve high efficiency in mid and high duty cycle applications. To power up the high-side driver, a capacitor is required between the BST and SW pins. ...
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... COMP COMP × π × × CROSSOVER × OUT COMP × COMP × π × × ZERO COMP ADP2442 (20) V × OUT (21) V REF × C COMP COMP (22) C COMP (23) × V OUT (24) REF (25) ...
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... ADP2442 DESIGN EXAMPLE Consider an application with the following specifications: • ± 10% IN • ± 1% OUT • Switching frequency: 700 kHz • Load: 800 mA typical • Maximum load current • Overshoot ≤ 2% under all load transient conditions CONFIGURATION AND COMPONENTS SELECTION ...
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... Current sense gain Output capacitor Output voltage π × × × × × ≈ 121 kΩ COMP × 250 ≈ 185 pF 180 pF COMP π × × × 118 ADP2442 Value 58.3 kHz 7.3 kHz 0.6 V 250 µA/V 2 A/V 22 µ ...
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... R5 118 kΩ kΩ kΩ kΩ C3 1µF/25V C5 C4 10nF/50V 1µF/25V FB VIN R5 ADP2442 118kΩ COMP SW C10 C6 185pF 0.1µF EN PGND VCC VCC R7 50kΩ PGOOD R9 CLOCK: 132kΩ 700k±30 ± 10 ...
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... Rev Page 24V C2 C1 4.7µF/ 4.7µF/ 50V 50V OUT 33.3µH 12V 22µF/ 25V = 600 kHz OUT SW Part Number GRM31CR71H475KA12L GRM188R71E105KA12D ECJ-1VB1H103K GRM32ER71E226K N/A 1 CoilCraft MSS1038-333ML ECJ-2FB1H104K Determined by user Determined by user Determined by user Determined by user Determined by user Determined by user ADP2442 ...
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... R5 118 kΩ kΩ kΩ kΩ C3 1µF/25V C5 C4 10nF/50V 1µF/25V FB VIN R5 ADP2442 118kΩ COMP SW C10 C6 270pF 0.1µF EN PGND EXT VCC R7 50kΩ PGOOD R9 CLOCK: 185kΩ 500k±30 ± 10 ...
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... IN 36V C2 C1 4.7µF/ 4.7µF/ 50V 50V OUT 33.3µH 3.3V 47µF/ 47µF/ 6.3V 6. 300 kHz OUT SW Part Number GRM31CR71H475KA12L GRM188R71E105KA12D ECJ-1VB1H103K GRM32ER70J476KE20L GRM32ER70J476KE20L CoilCraft MSS1038T-333ML ECJ-2FB1H104K Determined by user Determined by user Determined by user Determined by user Determined by user Determined by user ADP2442 ...
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... R5 115 kΩ 45.3 kΩ kΩ kΩ C3 1µF/25V C5 C4 10nF/50V 1µF/25V FB VIN R5 ADP2442 115kΩ COMP SW C10 C6 190pF 0.1µF EN PGND EXT VCC R7 50kΩ PGOOD R9 CLOCK: 132kΩ 700k±30 ± 10 Description Capacitor ceramic, X7R Capacitor ceramic, 1 µ ...
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... Equation 28, Equation 29, and Equation 30, and then estimate the temperature rise using Equation 31 and Equation 32. Improved thermal performance can be achieved by good board layout. For example, on the EVALZ), the measured θ the ADP2442-EVALZ evaluation board is shown in Figure 68 (29) and Figure 69. Rev Page ADP2442 ...
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... ADP2442 EVALUATION BOARD THERMAL PERFORMANCE 25° 0.2 0.4 0.6 0.8 IC POWER DISSIPIATION (W) Figure 68. Junction Temperature vs. Power Dissipation Based on ADP2442-EVALZ 145 125 105 1.0 1.2 1.4 Figure 69. Maximum Ambient Temperature vs. Power Dissipation Based on Rev Page Data Sheet 0 0.2 0.4 0.6 0.8 1.0 IC POWER DISSIPIATION (W) ADP2442-EVALZ 1.2 1.4 ...
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... In addition, connect the ground references of power components, such as input and output capacitors, to power ground. Connect both ground planes to the exposed pad of the ADP2442. • Place one end of the input capacitor as close as possible to the VIN pin, and connect the other end to the closest power ground plane. • ...
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... ADP2442 OUTLINE DIMENSIONS PIN 1 INDICATOR 0.80 0.75 0.70 SEATING PLANE ORDERING GUIDE Output Temperature 1 Model Voltage Range ADP2442ACPZ-R7 Adjustable −40°C to +125°C ADP2442-EVALZ RoHS Compliant Part. 3.10 0.30 3.00 SQ 0.23 2.90 0.18 10 0.50 9 BSC EXPOSED PAD 7 6 0.50 TOP VIEW BOTTOM VIEW 0.40 0.30 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.20 REF COMPLIANT TO JEDEC STANDARDS MO-229-WEED-4. ...
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... Data Sheet NOTES Rev Page ADP2442 ...
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... ADP2442 NOTES ©2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D10667-0-11/12(0) Rev Page Data Sheet ...