ANALOG DEVICES EVAL-LTM4703-AZ Evaluation Board User Guide
- August 31, 2024
- Analog Devices
Table of Contents
- ANALOG DEVICES EVAL-LTM4703-AZ Evaluation Board
- General Description
- Features and Benefits
- Evaluation Board Photo
- Performance Summary
- Quick Start
- Typical Performance Characteristics
- EVAL-LTM4703-AZ Evaluation Board Bill of Materials
- EVAL-LTM4703-AZ Evaluation Board Schematic
- References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
ANALOG DEVICES EVAL-LTM4703-AZ Evaluation Board
General Description
The EVAL-LTM4703-AZ evaluation board is a step-down dc-to-dc switching
converter featuring the LTM®4703 μModule® (micromodule) regulator. The EVAL-LTM4703- AZ is
designed to deliver 12A maximum output current from a 4V to 16V input. The
LTM4703 employs Silent Switcher®
architecture with internal hot loop bypass capacitors to achieve both low
electromagnetic interference (EMI) and high efficiency. The LTM4703 contains a
current mode regulator IC, a power inductor, and a modest amount of input and
output capacitance. A single resistor (R3) sets the output voltage, providing
unity gain operation over the output range, resulting in virtually constant
output noise independent of output voltage. The EVAL-LTM4703-AZ evaluation
board’s defaultswitching frequency is 400kHz. An external resistor is placed
from the RT pin to GND (R7) to set the switching frequency. The SYNC pin
programs three different operating modes(JP1 jumper): select PULSE for pulse-
skipping mode 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 LTM4703 in shutdown mode. The power good output (PG) will
be low when the output voltage exceeds the ±7.5% regulation window. When the
power good feature is used, set the PGSET resistor (R1) value according to the
regulator output voltage.
The LTM4703 data sheet provides a complete description of the operation and
application information. The data sheet must be read in conjunction with this
user guide.
Features and Benefits
- Parallel for High-Power Applications
- External or Internal Compensation
- With Optional Input EMI Filter
EVAL-LTM4703-AZ Evaluation Board Files
Ordering Information appears at end of this user guide.
Evaluation Board Photo
Performance Summary
Specifications are at TA = 25°C.
| PARAMETER | CONDITIONS | MIN | TYP | MAX | VALUE |
|---|---|---|---|---|---|
| Input voltage range | 4 | 16 | V | ||
| Output voltage | VIN = 4V to 16V, IOUT = 0A to 12A | 1 ±2% | V | ||
| Maximum output current | VIN = 4V to 16V | 12 | A | ||
| Typical switching frequency | RT = 287kΩ | 400 | kHz | ||
| Typical efficiency | VIN = 12V, IOUT = 12A | 86.8 | % |
Quick Start
Required Equipment
- One power supply: 16V, 5A
- One load: 1V, 12A
- Two digital voltmeters (DVMs) for VIN, and VOUT
Quick Start Procedure
The EVAL-LTM4703-AZ evaluation board is easy to set up to evaluate the
performance of the LTM4703. See Figure 2 for the proper measurement equipment
setup and follow the procedure below.
- With power off, connect the input power supply to VIN (4V to 16V) and GND (input return).
- Connect the 1V output load between VOUT and GND (initial load: no load).
- Connect the DVMs to the input and output. Set default jumper position:
- JP1
- FCM
- JP2
- 120 PS
- Turn on the input power supply and check for the proper output voltage. VOUT should be 1V ±2%.
- Once the proper output voltage is established, adjust the load within the operating range and observe the outputvoltage regulation, efficiency, and other parameters.
When measuring the output or the input voltage ripple, do not use the long ground lead on the oscilloscope probe. See Figure 3 for the proper scope probe technique. Short, stiff leads may be soldered to an output capacitor’s (+) and (–) terminals. The probe’s ground ring needs to touch the (–) lead, and the probe tip needs to touch the (+) lead.
Typical Performance Characteristics
EVAL-LTM4703-AZ Evaluation Board Bill of Materials
ITEM| QTY| REFERENCE| PART DESCRIPTION|
MANUFACTURER/PART NUMBER
---|---|---|---|---
Required Circuit Components
1| 1| C1| CAP. ALUM POLY HYBRID 100µF 25V 20% 6.3mm × 7.7mm AEC-Q200|
PANASONIC, EEHZC1E101XP
2| 1| C10| CAP. CER 1µF 25V 10% X7R 0603 AEC-Q200| TDK, CGA3E1X7R1E105K080AC
3| 2| C11, C12| CAP. CER 22µF 25V 10% X7R 1210| MURATA, GRM32ER71E226KE15L
4| 7| C13-C16, C21, C34, C35| CAP. CER 10µF 6.3V 20% X7R 0603| TDK,
C1608X7S0J106M080AC
5| 5| C6, C17, C19, C22, C33| CAP. CER 100µF 10V 20% X5R 1206 LOW ESR| TDK,
C3216X5R1A107M160AC
6| 3| C18, C23, C24| CAP. CER 0.1µF 25V 10% X7R 0603| SAMSUNG, CL10B104KA8NNNC
7| 2| C2, C26| CAP. CER 22µF 25V 20% X5R 0805 AEC-Q200| MURATA,
GRM21BR61E226ME44L
8| 4| C3-C5, C27| CAP. CER 2.2µF 25V 10% X5R 0603| MURATA, GRM188R61E225KA12D
9| 1| C60| CAP. CER 0.015µF 25V 1% C0G 0603 EXTREME LOW ESR| MURATA,
GCM188R72A153KA37D
10| 1| C9| CAP. CER 1µF 10V 10% X7R 0805| TAIYO YUDEN, MSASL219SB7105KTNA01
11| 1| FB1| IND. CHIP FERRITE 30Ω 10A 25% 0.003Ω DCR 0805| WURTH ELEKTRONIK,
742792030
12| 1| R1| RES. SMD 49.9kΩ 1% 1/10W 0603 AEC-Q200| PANASONIC, ERJ-3EKF4992V
13| 1| R10| RES. SMD 0Ω 1% 1/4W 1206| VISHAY, WSL120600000ZEA9
14| 1| R12| RES. SMD 1kΩ 1% 1/10W 0603 AEC-Q200| VISHAY, CRCW06031K00FKEA
15| 1| R13| RES. SMD 0Ω JUMPER 1/10W 0603 AEC-Q200 PRECISION POWER| VISHAY,
CRCW06030000Z0EA
16| 2| R2, R5| RES. SMD 100kΩ 1% 1/10W 0603 AEC-Q200| VISHAY, CRCW0603100KFKEA
17| 1| R3| RES. SMD 10kΩ 1% 1/10W 0603 AEC-Q200| PANASONIC, ERJ-3EKF1002V
18| 1| R4| RES. SMD 1Ω 1% 1/10W 0603| YAGEO, RC0603FR-071RL
19| 1| R7| RES. SMD 287kΩ 1% 1/10W 0603| YAGEO, RC0603FR-07287KL
20| 1| U1| IC-ADI 16VIN, 12A Silent Switcher µModule REGULATOR WITH LOW NOISE
REFERENCE| ANALOG DEVICES, LTM4703EY#PBF
Additional Evaluation Board Circuit Components
1| 0| C7, C8, C20, C25| |
2| 0| R6, R8, R9, R11| |
3| 0| L2| |
Hardware: For Evaluation Board Only
1| 5| E1, E3, E8, E10, E17| CONN-PCB BANANA JACK| KEYSTONE ELECTRONICS, 575-4
2| 11| E2, E4, E6, E7, E9, E11-E16| CONN-PCB SMD TEST POINT TIN
2.00mm × 1.20mm
| HARWIN, S2751-46R
3| 1| E5| CONN-PCB TEST POINT COMPACT MINI| KEYSTONE ELECTRONICS, 5019
4| 2| J1, J2| CONN-PCB SMA FEMALE JACK RCP, 50Ω| MOLEX, 732511350
5| 2| JP1, JP2| CONN., HDR, MALE, 2 × 3, 2mm, VERT, ST, THT| WURTH ELEKTRONIK,
62000621121
6| 3| | SHUNT, 2mm JUMPER WITH TEST POINT| WURTH ELEKTRONIK, 60800213421
7| 4| | STANDOFF, NYLON, SNAP-ON, 0.50″| WURTH ELEKTRONIK, 702935000
EVAL-LTM4703-AZ Evaluation Board Schematic
Ordering Information
| PART | TYPE |
|---|---|
| EVAL-LTM4703-AZ | 16V, 12A step-down μModule regulator with low noise |
reference.
Revision History
REVISION NUMBER| REVISION DATE| ****
DESCRIPTION
| PAGES CHANGED
---|---|---|---
0| 08/24| Initial release.| —
ALL INFORMATION CONTAINED HEREIN IS PROVIDED “AS IS” WITHOUT REPRESENTATION OR WARRANTY. NO RESPONSIBILITY IS ASSUMED BY ANALOG DEVICES FOR ITS USE, NOR FOR ANY INFRINGEMENTS OF PATENTS OR OTHER RIGHTS OF THIRD PARTIES THAT MAY RESULT FROM ITS USE. SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE. NO LICENSE, EITHER EXPRESSED OR IMPLIED, IS GRANTED UNDER ANY ADI PATENT RIGHT, COPYRIGHT, MASK WORK RIGHT, OR ANY OTHER ADI INTELLECTUAL PROPERTY RIGHT RELATING TO ANY COMBINATION, MACHINE, OR PROCESS, IN WHICH ADI PRODUCTS OR SERVICES ARE USED. TRADEMARKS AND REGISTERED TRADEMARKS ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS.
References
- Mixed-signal and digital signal processing ICs | Analog Devices
- Document Feedback Form | Analog Devices
- Mixed-signal and digital signal processing ICs | Analog Devices
- Support | Analog Devices
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