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ADP2441-EVALZ User Guide

UG-407

One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

ADP2441 Evaluation Board

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 12

FEATURES

Full-featured evaluation board for the ADP2441

Configurable synchronous step down dc-dc switching

regulator

Operating voltage range of board: V

= 6 V to 36 V

Output voltage is set to 5 V or can be adjusted

Maximum load 1 A

Switching frequency set to 500 kHz or adjustable switching

frequency of 300 kHz to 1 MHz

Power saving mode at light load

Precision enable input pin

Current limit protection

Power good output

External soft start set to 6 ms or external tracking available

Board size: 53 mm × 53 mm

DOCUMENTS NEEDED

ADP2441 data sheet

UG-407

GENERAL DESCRIPTION

The ADP2441 evaluation board is a complete, dc-to-dc switch-

ing regulator design based on the ADP2441, a configurable, 1 A,

synchronous step-down, dc-to-dc regulator.

The ADP2441 is a synchronous, step-down dc-to-dc switching

regulator that uses a current mode pulse-width modulation

(PWM) control scheme at medium-to-heavy load currents for

high efficiency and smoothly transitions to a pulse skip mode

at light loads to conserve power. The power switch and

synchronous rectifier are integrated for minimal external part

count and high efficiency. The ADP2441 is optimized for

operation with small ferrite core inductors and ceramic

capacitors to deliver the maximum output power per square

millimeter of the PCB board area.

The ADP2441-EVA L Z is available with 5 V at 1 A output,

switching frequency set to 500 kHz. If needed, the ADP2441

evaluation board configuration can be modified by changing

the values of the appropriate passive components.

Complete specifications for the ADP2441 device can be found

in the ADP2441 data sheet, which is available from Analog

Devices, Inc., and should be consulted in conjunction with this

user guide when using the evaluation board.

ADP2441-EVALZ

Figure 1.

10694-101

Summary of content (12 pages)

PAGE 1
ADP2441-EVALZ User Guide UG-407 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
PAGE 2
UG-407 ADP2441-EVALZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Modifying the Evaluation Board .....................................................5 Documents Needed .......................................................................... 1 Changing the Output Voltage ......................................................5 General Description ..................................................................
PAGE 3
ADP2441-EVALZ User Guide UG-407 USING THE EVALUATION BOARD PGOOD Signals POWERING UP THE EVALUATION BOARD When the output is enabled and the output voltage, VOUT, is in regulation, the logic signal at the PGOOD test point is high. In a typical application, a pull-up resistor from the PGOOD pin to the external supply is used to generate this logic signal. Input Power Source The power source voltage must not exceed 36 V, the maximum operation input voltage of the ADP2441.
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UG-407 ADP2441-EVALZ User Guide Measuring Line Regulation MEASURING EVALUATION BOARD PERFORMANCE Output Voltage Ripple To observe the output voltage ripple, place an oscilloscope probe tip at Terminal T3 and connect the probe ground lead at the negative (−) Terminal T4. Set the oscilloscope to an accoupled, 100 mV/division and 2 μs/division time base.
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ADP2441-EVALZ User Guide UG-407 MODIFYING THE EVALUATION BOARD Note that when the output voltage of ADP2441-EVALZ is changed, the output capacitors (C7 and C8), inductor (L1), and compensation components (R5 and C10) should be recalculated and changed according to the Application Information section in the ADP2441 data sheet to ensure stable operation. The ADP2441 evaluation board is provided fully assembled and tested for proper operation. The ADP2441-EVALZ has a fixed 5 V output voltage.
PAGE 6
UG-407 ADP2441-EVALZ User Guide TYPICAL PERFORMANCE CHARACTERISTICS 5.020 100 VIN = 12V VIN = 24V VIN = 36V 90 NO LOAD LOAD 1A 5.015 80 5.010 60 VOUT (V) EFFICIENCY (%) 70 50 40 30 5.005 5.000 4.995 20 4.990 0.1 4.985 10694-004 0 0.01 1 LOAD (A) 8 13 18 23 28 33 38 VIN (V) Figure 5. Efficiency vs. Load Current, VOUT = 5 V, fSW = 500 kHz 10694-007 10 Figure 8.
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ADP2441-EVALZ User Guide UG-407 ENABLE VOUT 1 2 VOUT LOAD STEP 500mA SS PGOOD 4 1 SW B CH2 10V M200µs A CH4 CH4 500mA Ω T 71.2% W 720mA CH1 2V CH3 2V Figure 11. Load Transient, VIN = 24 V, VOUT = 5 V, 500 mA Step W CH2 5V CH4 1V M400µs T 50.2% A CH2 1.90V Figure 14.
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UG-407 ADP2441-EVALZ User Guide EVALUATION BOARD SCHEMATICS AND ARTWORK 10694-015 Figure 16. Rev.
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UG-407 Figure 19. Second layer 10694-019 10694-018 Figure 17. Top Layer 10694-017 10694-016 ADP2441-EVALZ User Guide Figure 20. Bottom Layer Figure 18. Third layer Rev.
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UG-407 ADP2441-EVALZ User Guide ORDERING INFORMATION BILL OF MATERIALS Table 3. Qty 2 2 1 2 1 1 1 1 1 2 1 1 1 1 1 1 1 4 4 1 4 1 Reference Designator C1, C2 C3, C4 C5 C7, C8 C11 L1 C6 C10 R1 R3, R8 R7 R2 R5 R6 R9 R10 R11 TRACK, SS, IN, OUT TP1, TP2, TP3, TP4 JP1 PGOOD T1, T2, T3, T4 U1 Description Capacitor MLCC, 4.
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ADP2441-EVALZ User Guide UG-407 NOTES Rev.
PAGE 12
UG-407 ADP2441-EVALZ User Guide NOTES ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.