Analog Devices EVAL-LT7170-1-AZ User Manual

20A, 16V Dual-Phase Silent Switcher Step-Down Regulator with Digital Power System
General Description
Evaluation kit EVAL-LT7170-1-AZ is a dual-phase single-
output monolithic DC/DC
regulator with a 2.9V or 1.5V with EXTV
®
range featuring LT 7170-1. The output can supply 20A
continuous load current. The Silent Switcher
structure is incorporated into the LT7170-1 to minimize
EMI and reduce PCB layout sensitivity. It also integrates
digital power system management functionality, allowing
for programmability and telemetry with a PMBus/I
compliant serial interface. Refer to the LT7170-1 data
sheet for more detailed information.
The EVAL-LT7170-1-AZ evaluation board is designed for
1.0V output 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 EVAL-LT7170-1-AZ has EMI filters installed for
improved conducted and radiated EMI performances,
which are shown in Figure
CISPR32 limit for industrial application requirement. The
figure shows that the circuit passes the test with a wide
margin.
Performance Summary
PARAMETER
Input Voltage Range
Default Output Voltage
Maximum Continuous
Output Current
Switching Frequency
Efficiency
* The minimum V is limited by U3 (LTC4413) that provides RUN and VPULLUP signal. LT7170-1 is capable of minimum V
IN
with separate 3V ≤ EXTV
CC
Rev. A
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 .
synchronous step-down
to 16V input
CC
® regulator
5. The red lines in Figure 5 are
Specifications are at T
SYMBOL CONDITIONS
V
IN
V
OUT
I
OUT
f
SW
Eff V = 12V, I
IN
≤ 5.5V. For more details, refer to the
Evaluation Board User Guide
EVAL-LT7170-1-AZ
The EVAL-LT7170-1-AZ powers up to default settings and
produces power based on the NVM configuration 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 GUI software LTpowerPlay
and use ADI's I 2
connect to the board. LTpowerPlay allows the user to
2
C reconfigure the part on the fly, and store the configuration
in NVM, view telemetry of voltage, current, temperature,
and fault status. The NVM can be programmed up to three
times.
GUI Download
The software can be downloaded from LTpowerPlay.
The LT7170-1 data sheet 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-LT7170-1-AZ.
For more details and instructions of the LTpowerPlay, refer
to LTpowerPlay GUI for the LT7170-1 Quick Start Guide.
= 25°C
A
MIN
2.9*
0.925
= 10A
OUT
LT7170-1 data sheet.
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 .
Management
®
C/SMBus/PMBus dongle DC1613A to
TYP MAX
16
1.0
20
1 1.075
87.6
TECHNICAL SUPPORT
onto the PC
UNITS
V
V
A
MHz
%
of 1.5V
IN