Analog Devices EVAL-LT7184S-AZ User Manual

Dual Channel 9A, 16V, PolyPhase Step-Down Silent Switcher 2 with Digital Power
General Description
The EVAL-LT7184S-AZ evaluation board is a dual-output
®
PolyPhase monolithic DC/DC synchronous step-down
regulator with a 2.9V or 1.5V with EXTVCC to 16V input
range featuring LT ® 7184S. Each output can supply -8A to
+9A continuous current and simultaneously deliver up to
7A of continuous current from both channels. The second-
generation Silent Switcher
incorporated into the LT7184S to minimize EMI and reduce
Printed circuit board (PCB) layout sensitivity. It also
integrates digital power system management functions,
allowing for programmability and telemetry with a
2
PMBus/I C-compliant serial interface. Refer to the
®
LT 7184S datasheet for more detailed information.
The EVAL-LT7184S-AZ evaluation board is designed for
1.2V output0 and 3.3V output1 with a switching frequency
set at 1MHz. The controlled on-time valley current-mode
control with 25ns typical minimum on-time enables a high
switching frequency at a low output voltage with excellent
transient response in a small overall solution size.
The evaluation board has Electromagnetic interference
(EMI) filters installed for both channels. The EMI
performances of the board are shown in
lines in Figure 5 are the CISPR25 CLASS 5 limit.
Performance Summary
Specifications are at T
A
PARAMETER
Input Voltage Range
Output 0 Voltage
Maximum Continuous Output 0 Current
Output 1 Voltage
Maximum Continuous Output 1 Current
Switching Frequency
Efficiency
*LT7184S is capable of minimum V
Rev 0
O n e A n a l o g W a y , W i l m i n g t o n , M A 0 1 8 8 7 - 2 3 5 6 , U . S . A .
®
regulator structure
Figure 5. The red
= 25°C
SYMBOL
V
IN
V
OUT0
I
OUT0
V
OUT1
I
OUT1
f
SW
Eff
of 1.5V with separate 3V ≤ EXTV
IN
Evaluation Board User Guide
EVAL-LT7184S-AZ
The EVAL-LT7184S-AZ powers up to default settings and
produces power based on the configuration resistors
without the need for any serial bus communication. This
allows easy evaluation of the DC/DC converter. To fully
explore the power system management features of the
part, download the Graphic user interface (GUI) software
®
is LTpowerPlay onto the PC and use Analog Devices'
2
I C/SMBus/PMBus dongle
board. LTpowerPlay allows the user to reconfigure the part
on the fly and store the configuration in Electrically
erasable programmable read-only memory (EEPROM),
viewing telemetry of voltage, current, temperature, and
fault status.
Graphic User Interface (GUI) Download
The software can be downloaded from LTpowerPlay.
The LT7184S datasheet gives a complete description of
the part, operation, and application information. The data
sheet must be read in conjunction with this demo manual
for EVAL-LT7184S-AZ.
For more details and instructions on the LTpowerPlay, see
the LTpowerPlay Software GUI
Quick Start Guide
CONDITIONS
V = 12V, I = 4.5A, I
IN OUT0
V = 12V, I off, I
IN OUT0 OUT1
≤ 5.5V.
CC
DOCUMENT FEEDBACK
T e l : 7 8 1 . 3 2 9 . 4 7 0 0 © 2 0 2 4 A n a l o g D e v i c e s , I n c . A l l r i g h t s r e s e r v e d .
System Management
DC1613A to connect to the
section for the LT7184S
MIN TYP
2.9*
1.2
9
3.3
9
0.925 1
off
86.3
OUT1
= 4.5A
92.8
TECHNICAL SUPPORT
MAX UNITS
16 V
V
A
V
A
1.075 MHz
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