Analog Devices EVAL-LTM4702-AZ Demo Manual
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Analog Devices EVAL-LTM4702-AZ Demo Manual

Ltm4702ey 16v, 8a step-down mmodule regulator with low noise reference
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DESCRIPTION
Evaluation board EVAL-LTM4702-AZ is a step-down
DC/ DC switching converter featuring the
μModule
regulator. The evaluation board is designed to
®
deliver 8A maximum output current from a 4V to 16V
input. The LTM4702 employs Silent Switcher
ture with internal hot loop bypass capacitors to achieve
both low EMI and high efficiency. The LTM4702 contains
a current mode regulator IC, power inductor, and a modest
amount of input and output capacitance. A single resis-
tor (R3) sets the output voltage, providing unity gain oper-
ation over the output range, resulting in virtually constant
output noise independent of output voltage.
The EVAL-LTM4702-AZ evaluation board default switch-
ing frequency is 800kHz. An external resistor is placed
from RT pin to GND (R7) to set the switching frequency.
SYNC pin programs three different operating modes
(JP1 jumper): select PULSE for pulse-skipping mode
BOARD PHOTO
Regulator with Low Noise Reference
LTM
4702
®
architec-
®
Part marking is either ink mark or laser mark
16V, 8A Step-Down μModule
with improved efficiency at light loads; select FCM for
forced continuous mode operation where fixed frequency
operation is more critical than low current efficiency and
where the lowest output ripple is desired; select SYNC to
synchronize to an external clock signal.
The RUN terminal can be used to set the LTM4702 in
shutdown mode. The power good output (PG) will be low
when the output voltage is outside of the ±7.5% regula-
tion window. When the power good feature is used, set
the PGSET resistor (R1) value according to the regulator
output voltage.
The LTM4702 data sheet gives a complete description of
the operation and application information. The data sheet
must be read in conjunction with this evaluation board.
Design files for this circuit board are
All registered trademarks and trademarks are the property of their respective owners.
DEMO MANUAL
EVAL-LTM4702-AZ
LTM4702EY
available.
Rev. 0
1

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Summary of Contents for Analog Devices EVAL-LTM4702-AZ

  • Page 1 LTM4702EY 16V, 8A Step-Down μModule Regulator with Low Noise Reference DESCRIPTION Evaluation board EVAL-LTM4702-AZ is a step-down with improved efficiency at light loads; select FCM for DC/ DC switching converter featuring the 4702 forced continuous mode operation where fixed frequency ®...

  • Page 2: Quick Start Procedure

    = 12V, I = 8A 80.5 QUICK START PROCEDURE Evaluation board EVAL-LTM4702-AZ is easy to set up to 4. Turn on the input power supply and check for the evaluate the performance of the LTM4702. See Figure 1 proper output voltage. V should be 1V ±2%.

  • Page 3: Typical Performance Characteristics

    A A R R T T F F I I L L M M - - Q Q S S G G Figure 1. Proper Measurement Equipment Setup A A R R T T F F I I L L M M - - Q Q S S G G – eval-ltm4702-az F02 Figure 2. Measuring Output Ripple Voltage Rev. 0...

  • Page 4: Test Results

    1.0V AT 800kHz 1.5V AT 1.2MHz 2.5V AT 1.4MHz 3.3V AT 1.7MHz 5.0V AT 1.9MHz LOAD CURRENT (A) eval-ltm4702-az F03 Figure 3. Efficiency vs Load Current, V = 12V AC-COUPLED 20mV/DIV AC-COUPLED 10mV/DIV 4A LOAD STEP 2A/DIV eval-ltm4702-az F04 2 s/DIV...

  • Page 5: Parts List

    RES., SMD, 1Ω, 1%, 1/10W, 0603 YAGEO, RC0603FR-071RL RES., 137k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603137KFKEA IC-ADI, 18V , 8A, Silent Switcher, μModule REGULATOR ANALOG DEVICES, LTM4702EY#PBF Additional Demo Board Circuit Components C7, C8, C20, C25 OPTIONAL CAPACITOR R6, R8, R9, R11 OPTIONAL RESISTOR...

  • Page 6: Schematic Diagram

    DEMO MANUAL EVAL-LTM4702-AZ SCHEMATIC DIAGRAM Rev. 0...

  • Page 7: Revision History

    Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
  • Page 8 Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY.

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