Analog Devices Linear ADI Power SCP-LT8609S-BEVALZ Quick setup guide

DEMO MANUAL SCP-LT8609S-BEVALZ
Rev. 1
1
DESCRIPTION
Demonstration circuit SCP-LT8609S-BEVALZ is a 42V,
2A/3A peak micropower synchronous step-down regula-
tor featuring the LT8609S. The demo board is configured
for a 5V output from a 5.5V to 42V input.
Like all boards in the Signal Chain Power series, this board
is designed to be easily plugged into other SCP boards to
form a complete signal chain power system, enabling fast
evaluation of low power signal chains. To evaluate this
board, some universal SCP hardware is required, namely:
SCP-INPUT-EVALZ SCP-1X2BKOUT-EVALZ
SCP-OUTPUT-EVALZ SCP-1X5BKOUT-EVALZ
SCP-FILTER-EVALZ SCP-5X1-EVALZ
SCP-THRUBRD-EVALZ
To properly evaluate SCP series demo boards, you will
need the SCP Configurator companion software. SCP
Configurator can help you choose the right board and to-
pology for your design.
Note that this Demo Manual does not cover details im-
portant to the operation and configuration regarding the
LT8609S. Please refer to the LT 8 6 0 9 S d a t a s h e e t for a com-
plete description of the part.
Design files for this circuit board are available.
All registered trademarks and trademarks are property of their respective owners.
Table 1. Performance Summary
SYMBOL
PARAMETER
NOTES
MIN
TYP
MAX
UNITS
V
IN(MAX)
Max Input Voltage
42
V
V
OUT(MAX)
Max Output Voltage
24
V
I
OUT(MAX)
Max Output Current
2
A
BOARD IMAGE
Figure 1. SCP-LT 8 6 0 9 S -BEVALZ Evaluation Board
DEMO MANUAL
SCP-LT8609S-BEVALZ
Signal Chain Power Series
LT8609S Synchronous
Step-Down Regulator

DEMO MANUAL SCP-LT8609S-BEVALZ
Rev. 1
2
QUICK START PROCEDURE
Demonstration circuit SCP-LT8609S-BEVALZ is easy to
set up to evaluate the performance of any SCP hard-
ware configuration.
1. The SCP-LT8609S-BEVALZ ships with a default output
voltage of 5V. To change the output voltage, see “Con-
figuration Settings” section, and modify the board ac-
cordingly. Be sure to check for open connections or sol-
der shorts after making any modifications.
2. Connect the SCP-INPUT-EVALZ and SCP-OUTPUT-
EVALZ boards to the SCP-LT8609S-BEVALZ (refer to
Figure 2) and connect the input board to a voltage
source, V
SOURCE
. Connect the output board to a volt-
meter or dynamic load. Slowly raise the input voltage
until the SCP-LT8609S-BEVALZ powers up into regula-
tion and sweep V
SOURCE
through the desired range of
operation.
NOTE: Make sure that the input voltage is always within
spec. If using a dynamic load to measure output volt-
age, make sure the load is initially set to zero.
3. Check for proper output voltage. The output should be
regulated at the programmed value (±5%).
4. Once the proper output voltage is established, power
off V
SOURCE
and similarly test other boards in the SCP
system until all elements have been individually verified
prior to assembling into the final circuit configuration.
NOTE: When measuring the input or output voltage rip-
ple, use the optional SMA connector locations available
on the input, output, 1 ´ 5, 1 ´ 2, and 5 ´ 1 breakout
boards. Avoid using the test point connections with
long scope leads.
Figure 2. Proper Measurement Equipment Setup (Use SMA connectors for Measuring Input or Output Ripple)

DEMO MANUAL SCP-LT8609S-BEVALZ
Rev. 1
3
CONFIGURATION SETTINGS
Demonstration circuit SCP-LT8609S-BEVALZ is a 42V,
2A/3A peak micropower synchronous step-down regula-
tor featuring the LT8609S. The demo board is designed for
5V output from a 5.5V to 42V input.
The output of the SCP-LT8609S-BEVALZ is resistor-pro-
grammable from 0.8V to 24V. T h e b o a r d c a n b e also con-
figured to drive VIOC-capable LDO regulators.
OUTPUT VOLTAGE PROGRAMMING
!
Table 2. Resistor Selection Guide for Common Output Voltages
V
OUT
(V)
R4 (Ω)
R5 (Ω)
0.8
3.57k
107k
0.9
17.4k
107k
1.0
102k
348k
1.1
29.4k
69.8k
1.2
73.2k
133k
1.25
115k
187k
1.5
187k
200k
1.8
215k
162k
2.0
187k
118k
2.5
255k
115k
3.0
348k
121k
3.3
332k
102k
3.5
357k
102k
4.0
442k
102k
4.5
511k
107k
5.0
549k
100k
5.5
698k
115k
6.0
931k
137k
6.5
787k
107k
7.0
909k
113k
7.5
887k
102k
8.0
953k
102k
8.5
1.00M
100k
9.0
1.00M
93.1k
9.5
1.00M
88.7k
10.0
1.00M
84.5k
12.0
1.00M
68.1k
16.0
1.00M
51.1k
20.0
1.00M
20.2k
24.0
1.00M
33.2k
EN/UVLO PIN CONFIGURATION
The EN/UVLO pin is tied to the optional SCP Run/Se-
quence header P1. To create a harness for this function,
use Molex part # 0510650300 with crimp pin # 50212-
8000.
To use an active run signal, use a 1.00M for either pull-up
or pull-down resistors R1 and R6, short R7 with 0 W , and
use the drive signal from connector P1.
If precision UVLO operation is desired, program enable di-
vider R5 and R6 such that:
R6 is 10k to 100k, nominal
!!
!
The LT8330 has an accurate 1.60V threshold which
places the part into under voltage lockout. The hysteresis
threshold on the rising edge is typically 80mV and scales
by the factor:
!
!
VOLTAGE INPUT-TO-OUTPUT CONTROL (VIOC)
IMPLEMENTATION
To implement the VIOC function for this regulator, set R13
and R14 to 0 W , respectively. Refer to the “Configuration
Settings” section in the Demo Manual for the LDO board
and use the following configuration for this board.
Table 3. VIOC Cross-Reference Designators
VIOC SETTING REFERENCES
R
BOT
R
TOP
R
MAX
V
OUT
Reference Designators
R4
R5
R13
!
!
I
SINK
is the current through R
MAX
, typically 15µA, so R
BOT
should be sized such that the divider current runs a mini-
mum of 100µA to minimize the I
SINK
error term.
VOUT =0 .7 7 4 VFB 1+R4
R5
⎛
⎝
⎜⎞
⎠
⎟
R5 =R6 VIN −1 .0 5 VTH
1 .0 5 VTH
⎛
⎝
⎜⎞
⎠
⎟
VHYST =50mV R5 +R6
R6
VL DOIN −VL DOOUT =VVIOC =0 .7 7 4 VFB
RBOT +RTOP
RBOT
⎛
⎝
⎜⎞
⎠
⎟
VMAX
( )
LDOIN =0 .7 7 4 VFB
RBOT +RTOP +RMAX
RBOT
⎛
⎝
⎜⎞
⎠
⎟+ISINKRMAX

DEMO MANUAL SCP-LT8609S-BEVALZ
Rev. 1
4
SYNC PIN CONFIGURATION
The table below shows the various configurations possi-
ble with the SYNC pin.
If clock synchronization option is desired, the SCP-
LT8609S-BEVALZ can be driven from an external source
via the optional SMA connector.
Table 4. SYNC Pin Configuration
MODE
R8
R9
R10
Burst Mode (default)
0
W
Open
Open
External Clock Synchronized
Open
0
W
Open
Pulse Skip/Spread Spectrum
Open
Open
0
W
Pulse Skip
Open
Open
Open
FREQUENCY (RT) PIN CONFIGURATION
The LT8609S allows the user to program the switching fre-
quency (f
SW
) by a single resistor (R2). The default operat-
ing frequency is 2.0MHz. Note that changing the switching
frequency may affect other parameters and likely will ne-
cessitate a change in inductor and compensation compo-
nent values. Contact the SCP team for support if shifting
the switching frequency greater than ±10%.
Table 5. Switching Frequency f
SW
vs Resistor R
2
Value
f
SW
R2 (Ω)
f
SW
R2 (Ω)
200kHz
221K
1.30MHz
30.1K
300kHz
143K
1.40MHz
27.4K
400kHz
110K
1.50MHz
25.5K
500kHz
86.6K
1.60MHz
23.7K
600kHz
71.5K
1.70MHz
22.1K
700kHz
60.4K
1.80MHz
20.5K
800kHz
52.3K
1.90MHz
19.1K
900kHz
46.4K
2.00MHz
18.2K
1.00MHz
40.2K
2.10MHz
16.9K
1.10MHz
36.5K
2.20MHz
16.2K
1.20MHz
33.2K

DEMO MANUAL SCP-LT8609S-BEVALZ
Rev. 1
5
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
1
PCB
PCB
ANALOG DEVICES 08_051163b
2
1
C1
CAP ALUM 22UF 63V 20% 6X6MM
UNITED CHEMI CON
EMVE630ADA220MF80G
3
1
C2
CAP CER 4.7UF 50V 10% X7R 1206
SAMSUNG CL31B475KBHNNNE
4
1
C4
CAP CER X7R, AUTOMOTIVE GRADE
TDK CGA3E1X7R1E105K080AD
5
1
C5
CAP CER 10PF 50V 5% C0G 0603
SAMSUNG CL10C100JB8NNNC
6
1
C6
CAP CER 47UF 25V 20% X5R 1210
TAIYO YUDEN TMK325ABJ476MM-P
7
1
C8
CAP CER X7R
YAGEO CC0603KRX7R9BB103
8
1
C9
CAP CER X7R
SAMSUNG CL21B105KBFNNNE
9
1
INPUT
CONN-PCB MALE HEADER 3POS 2.54MM PITCH R/A GOLD
SULLINS PBC03SBAN
10
1
L1
IND SHIELDED POWER
COILCRAFT XFL4020-222MEB
11
1
OUTPUT
CONN FEMALE 3POS 2.54MM PITCH R/A GOLD
SULLINS PPPC031LGBN-RC
12
1
P1
CONN-PCB 3POS HEADER WIRE TO BRD WAFER ASSY
STRAIGHT 2MM PITCH (Note 1)
MOLEX 53253-0370
13
1
R1
RES THICK FILM CHIP, GENERAL PURPOSE
YAGEO RC0805JR-071ML
14
1
R2
RES PRECISION THICK FILM CHIP
PANASONIC ERJ-6ENF1822V
15
1
R3
RES PRECISION THICK FILM CHIP
PANASONIC ERJ-3EKF4992V
16
1
R4
RES PRECISION THICK FILM CHIP
PANASONIC ERJ-6ENF1004V
17
1
R5
RES THICK FILM CHIP
VISHAY CRCW0805182KFKEA
18
6
R6, R7, R9, R10, R12,
R13
RES THICK FILM 0805 (Note 1)
N/A
19
3
R8, R11, R14
RES STANDARD THICK FILM CHIP JUMPER, FOR
AUTOMOTIVE
VISHAY CRCW08050000Z0EA
20
1
SYNC
CONN-PCB STRAIGHT SMA PCB DIE CAST (Note 1)
TE CONNECTIVITY LTD 5-1814832-1
21
1
U1
IC-LIN 42V, 2A/3A PEAK SYNCHRONOUS STEP-DOWN
REGULATOR WITH 2.5UA QUIESCENT CURRENT
LINEAR TECHNOLOGY LT8609SEV#PBF
22
1
VIOC
CONN FEMALE 2POS 2.54MM PITCH R/A GOLD
SULLINS PPPC021LGBN-RC
Note 1. These items are not stuffed (DNI).

DEMO MANUAL SCP-LT8609S-BEVALZ
Rev. 1
6
SCHEMATIC DIAGRAM
NC
MALE
FEMALE FEMALE
LT8609S BUCK
4.7UF
50V
2 2
<DESIGN_VIEW>
: LT8609S
Product(s): LT8609S
HW TYPE : Evaluation Kit - Z
1:1
B
02_051163
J. VIERNES
2.2UH
XFL4020-222MEB
LT8609SEV#PB
1M EG
49.9K
25V 1UF
63V
50V
0.01U F
18.2K
50V
5-1814832-1
10PF
DNI
DNI
DNI DNI DNI
DNI
1MEG
53253-0370
DNI
DNI
PBC03SBAN
22UF
0
18 2K
0
25V 47UF
50V 1UF
0PPPC021LGBN-RC
PPPC031LGBN-RCR10
L1
R4
R3
C5
R22
C4
R23
R 8
R2
R 9
R12
R 7 R 6
C8
U1
P1
SYN C
INP UT
R21
C1 C2 R1
R5
PG
R1 3
R11
C6
R2 9 R2 7 R2 8
C9
R2 6 R2 4 R2 5
R30
R31
R32
R14
VIOC
OU TPUT
R35 R34 R33
VIOC
VO+
GND
RUN
V+ VNEG
VNEG
SYNC
PG
VO-
VNEG
VIOC GND VO+ VO-
VNEG
14
PAD
8
11
3 2 1
5
1
2 3 4
1
2
3
1
2 1 2 1 3
12
20
18
13
3
4
5 6
16
2 9
10 15
7
17
19
1
EPAD
NC
NC
NC
NC
SYN C TR/ SS
GND
FB
PG
EN/U V VIN VIN
GND
NC
SW SW
GND
GND
VCC RT
D
THIS DRAWING IS THE PROPERTY OF ANALOG DEVICES INC. IN PART, OR USED IN FURNISHING INFORMATION TO OTHERS, OR FOR ANY OTHER PURPOSE DETRIMENTAL TO THE INTERESTS THE EQUIPMENT SHOWN HEREON MAY BE PROTECTED BY PATENTS
A
C
IT IS NOT TO BE REPRODUCED OR COPIED, IN WHOLE OR
DRAWING NO.
2
SCALE
D
D
D
SIZE
D
REV
SHEET
1
1
A
2
3
4
3
5
8
D
7
67
8
A B CC
D
5
4
APPROVED
B
6
DESCRIPTION
REVISIONS
OF
OL G E
OWNED OR CONTROLLED BY OWNED ANALOG DEVICES.
E
AN
V
OF ANALOG DEVICES.
SCHEMATIC
S
PTD EN GINEER DESIG N VIEW
REV DATE

DEMO MANUAL SCP-LT8609S-BEVALZ
Rev. 1
7
Information furnished by Analog Devices is believed to be accurate and reliable. However, 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
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Information furnished by Analog Devices is believed to be accurate and reliable. However, 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
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

DEMO MANUAL SCP-LT8609S-BEVALZ
Rev. 1
8
2/21
www.analog.com
© ANALOG DEVICES INC. 2021
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.
Legal
Terms and Conditions
By
using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms
and
conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluat
ion
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. Customer understands
and
agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license
granted
is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any
Third
Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board
is
NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall
all
be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation
of
use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble,
decompile
or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not
limited
to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the
RoHS
Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION
OF
LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALL
Y
DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO,
THE
IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND IT
S
LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD,
INCLUDING
BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF
ONE
HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United
States
federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts
(excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits
to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.