Analog Devices EVAL-LT8350-AZ User manual

1
DEMO MANUAL
EVAL-LT8350-AZ
Rev. 0
DESCRIPTION
LT8350
40VIN, 18VOUT, 6A Synchronous
Buck-Boost SilentSwitcher
®
Evaluation circuit EVAL-LT8350-AZ is a 40V synchronous
buck-boost converter featuring the LT
®
8350. It drives
up to 2.5A load at 12V output when VIN is between 9V
and 40V and will run down to 3VIN with reduced out-
put current. EVAL-LT8350-AZ runs at 350kHz switching
frequency with spread spectrum frequency modulation
(SSFM) disabled. When enabled, SSFM spreads the
switching frequency of the LT8350 from fSW to fSW +
25% for reduced EMI emission.
The LT8350 has an operating input voltage range of
3V to 40V. It has internal, synchronous 42V MOSFETs
at buck-side and 20V MOSFETs at boost-side for high
efficiency and small size. It has an adjustable switching
frequency between 200kHz and 2MHz. The LT8350 can
be synchronized to an external source, programmed with
SSFM enabled for low EMI, or set to normal operation.
The LT8350’s integrated LOADTG high side PMOS driver
assists with disconnecting load when a fault is triggered.
LOADTG turns off the PMOS when FB < 0.25V or FB >
1.1V or ISP–ISN > 0.75V. LOADEN can be used directly
to turn off LOADTG and all power switches.
The LT8350 can regulate output current using ISP and
ISN. Maximum load current can be limited when LT8350
is used for a constant voltage regulator. It can be also used
for a LED driver or a battery charger where constant cur-
rent regulation is required. Output current can be adjusted
by placing a controllable DC voltage on the CTRL pin. All registered trademarks and trademarks are the property of their respective owners.
The output current can be monitored through the ISMON
output pin. ISMON can be used to improve load transient
response by injecting load current to V
C
. The load current
injection is described in the following sections.
Undervoltage lockout can be adjusted on EVAL-LT8350-AZ
with a few simple resistor choices.
Small ceramic input and output capacitors are used to
save space and cost. The board is designed with tiny, high
frequency capacitors placed near the VIN and VOUT pins
for a reduction in radiated EMI.
There is an inductor EMI filter and a small ferrite bead EMI
filter on the input and output of EVAL-LT8350-AZ. These
filters, combined with proper board layout and SSFM,
are effective in reducing EMI to pass CISPR25 class 5
conducted EMI. Please follow the recommended layout
and four-layer PCB thickness of EVAL-LT8350-AZ for low
EMI applications.
The LT8350 data sheet gives a complete description of
the part, operation, and applications information. The data
sheet must be read in conjunction with this demo manual
for EVAL-LT8350-AZ. The LT8350RV is assembled in a
32-lead laminate package with QFN footprint (LQFN) with
thermally enhanced exposed ground pads. Proper board
layout is essential for maximum thermal performance.
Design files for this circuit board are available.

2
DEMO MANUAL
EVAL-LT8350-AZ
Rev. 0
PERFORMANCE SUMMARY
Specifications are at TA= 25°C
BOARD PHOTO
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage VIN Range Operating, R7 = 402k, R12 = OPEN 3 40 V
Full Load (2.5A) Input Voltage Range Component Temperature < 85°C at Room
Temperaturewith No Airflow
7 40 V
Output Voltage (VOUT) R22 = 110k, R3 = 10.0k 12.0 V
Output Voltage Ripple VIN = 12V, VOUT = 12V, IOUT = 2.5A 50 mV
Maximum Output Current 7.0V < VIN < 40V, VOUT = 12V 2.5 A
Switching Frequency (fSW) R4 = 143k, SSFM = OFF
R4 = 143k, SSFM = ON
350
350 to 440
kHz
kHz
Typical Efficiency without EMI filters VIN = 12V, VOUT = 12V, IOUT = 2.5A 95 %
Typical Efficiency with EMI filters VIN = 12V, VOUT = 12V, IOUT = 2.5A 94 %
Peak Switch Current Limit 6 7 8 A
VOUT Overvoltage Threshold R22 = 110k, R3 = 10.0k 13.2 V
VIN Undervoltage Lockout (UVLO) Falling R7 = 402k, R12 = 84.5k, IOUT = 2.5A 7.2 V
VIN Enable Turn-On (EN) Rising R7 = 402k, R12 = 84.5k, IOUT = 2.5A 8.0 V

3
DEMO MANUAL
EVAL-LT8350-AZ
Rev. 0
QUICK START PROCEDURE
Evaluation circuit EVAL-LT8350-AZ is easy to set up to
evaluate the performance of the LT8350. Refer to Figure1
for proper measurement equipment setup and follow the
procedure below.
NOTE:Make sure that the voltage applied to VIN does
not exceed 40V, which is the voltage rating for input side
MOSFETs.
1. With power off, connect a load capable of 12V2.5A
operation between OUT and GND turrets on the PCB
as shown in Figure1 .
2. Connect the EN/UVLO terminal to GND with a clip-on
lead. Connect the power supply (with power off) and
meters as shown in Figure1 .
3. Set JP1 at NO SSFM to disable SSFM, at SSFM to
enable SSFM.
4. Set JP2 at RC for typical loop compensation, at RC+FF
for load current injection scheme which improves load
transient response.
5. After all connections are made, turn on the input power
and verify that the input voltage is between 7V and 40V.
6. Remove the clip-on lead from EN/UVLO. Verify that
the output voltage is 12V.
NOTE: If the output voltage is low, temporarily discon-
nect the load to make sure that it is not set toohigh.
7. Oncetheproperoutputvoltageisestablished,adjustthe
input voltage and load within the operating ranges and
observe the output voltage regulation, ripple voltage,
efficiency, and other parameters.
Figure1. Test Procedure Setup Drawing for EVAL-LT8350-AZ

4
DEMO MANUAL
EVAL-LT8350-AZ
Rev. 0
WITHOUT EMI FILTERS
WITH EMI FILTERS
INPUT VOLTAGE (V)
4
8
12
16
20
24
28
32
36
40
80
84
88
92
96
100
EFFICIENCY (%)
EVAL-8350 F02
Figure2. EVAL-LT8350-AZ Efficiency vs Input Voltage for
2.5A Load with SSFM
TEST RESULTS
1µs/DIV
V
OUT
50mV/DIV
AC-COUPLED
EVAL-8350 F03
Figure3. EVAL-LT8350-AZ Output Voltage Ripple at 12V
Input Voltage and 2.5A Load
200µs/DIV
LOAD
CURRENT
2A/DIV
V
OUT
500mV/DIV
AC-COUPLED
EVAL-8350 F04
Figure4. EVAL-LT8350-AZ Transient Response with JP1 =
FCM+SSFM and JP2 = RC (12VIN 12VOUT 2.5A to 1.25A)
200µs/DIV
LOAD
CURRENT
2A/DIV
V
OUT
500mV/DIV
AC-COUPLED
EVAL-8350 F05
Figure5. EVAL-LT8350-AZ Transient Response with JP1 =
FCM+SSFM and JP2 = RC (12VIN 12VOUT 2.5A to 0A)
Figure6. EVAL-LT8350-AZ Thermals 12VIN to 12VOUT 2.5A
with SSFM ON
Figure7. EVAL-LT8350-AZ Thermals, Worst Case
(4-Switch Operation) 9.5VIN to 12VOUT 2.5A with SSFM ON

5
DEMO MANUAL
EVAL-LT8350-AZ
Rev. 0
Load transient response can be improved with JP2 =
RC+FF, which is called load current injection. The idea is
to inject or feedforward load current to VCusing ISMON
and a voltage divider (VR1 and R17). With JP2 = RC+FF,
the RC compensation, R5 and C6, is connected to ISMON
through the voltage divider instead of GND. When the
load current rises stepwise, ISMON rises immediately and
thus, V
C
is boosted faster compared to when the load
current injection is not used (JP2 = RC). To determine
the proper amount of load current injection, Equation 1
can be used.
140 • R1•
R17
VR1+R17
=1
(1)
LOAD CURRENT INJECTION FOR FASTER LOAD TRANSIENT RESPONSE
As EVAL-LT8350-AZ uses R1 = 10mΩ and R17 = 3.01kΩ,
VR1 is determined to 1.2kΩ. Figure8 and Figure9 show
half to full load transient response and zero to full load
transient response, respectively, with the load current
injection scheme (JP2 = RC+FF and VR1 = 1.2kΩ). It
is shown that the output voltage drop is smaller than
Figure4and Figure5. With the load current injection,
output voltage drop can be reduced keeping the same
output capacitance or output capacitance can be reduced
keeping the same output voltage drop.
Figure8. EVAL-LT8350-AZ Transient Response with JP1 =
FCM+SSFM, JP2 = RC+FF (12VIN 12VOUT 2.5A to 1.25A)
Figure9. EVAL-LT8350-AZ Transient Response with JP1 =
FCM+SSFM and JP2 = RC+FF (12VIN 12VOUT 2.5A to 0A)
200µs/DIV
LOAD
CURRENT
1A/DIV
V
OUT
500mV/DIV
AC-COUPLED
EVAL-8350 F09
200µs/DIV
EVAL-8350 F08
LOAD
CURRENT
1A/DIV
V
OUT
500mV/DIV
AC-COUPLED

6
DEMO MANUAL
EVAL-LT8350-AZ
Rev. 0
CLASS 5 AVERAGE LIMIT
EVAL-LT8350-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
108
–20
–10
0
10
20
30
40
50
60
70
80
AVERAGE CONDUCTED EMI (dBµV)
EVAL-8350 F10a
(a) CISPR25 Average, Voltage Method
EMISSION RESULT
CLASS 5 PEAK LIMIT
EVAL-LT8350-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
108
–20
–10
0
10
20
30
40
50
60
70
80
PEAK CONDUCTED EMI (dBµV)
EVAL-8350 F10b
(b) CISPR25 Peak, Voltage Method
Figure10. EVAL-LT8350-AZ CISPR25 Voltage Conducted EMI Performance with 12VIN to 12VOUT at 2.5A, JP1 = DCM+SSFM
CLASS 5 AVERAGE LIMIT
EVAL-LT8350-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
100
300
–60
–50
–40
–30
–20
–10
0
10
20
30
40
50
60
AVERAGE CE (dBµA)
EVAL-8350 F11a
(a) CISPR25 Average, Current Method
CLASS 5 PEAK LIMIT
EVAL-LT8350-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
100
300
–60
–50
–40
–30
–20
–10
0
10
20
30
40
50
60
PEAK CE (dBµA)
EVAL-8350 F11b
(b) CISPR25 Peak, Current Method
Figure11. EVAL-LT8350-AZ CISPR25 Current Conducted EMI Performance with 12VIN to 12VOUT at 2.5A, JP1 = DCM+SSFM
CLASS 5 AVERAGE LIMIT
EVAL-LT8350-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
100
1000
–20
–10
0
10
20
30
40
50
60
AVERAGE RADIATED EMI (dBµV/m)
EVAL-8350 F12a
(a) CISPR25 Average, Radiated
CLASS 5 PEAK LIMIT
EVAL-LT8350-AZ
AMBIENT
FREQUENCY (MHz)
0.1
1
10
100
1000
–20
–10
0
10
20
30
40
50
60
PEAK RADIATED EMI (dBµV/m)
EVAL-8350 F12b
(b) CISPR25 Peak, Radiated
Figure12. EVAL-LT8350-AZ CISPR25 Radiated EMI Performance with 12VIN to 12VOUT at 2.5A, JP1 = DCM + SSFM

7
DEMO MANUAL
EVAL-LT8350-AZ
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Electrical Components
1 1 U1 IC, BUCK-BOOST VOLTAGE REGULATOR, LQFN-32 ANALOG DEVICES, LT8350RV#PBF
2 1 L1 IND., 6.8μH, PWR, SHIELDED, 20%, 9A, 20.80mΩ, 6.56mm ×
6.36mm, AEC-Q200, XAL6060
COILCRAFT, XAL6060-682MEB
3 1 C3 CAP., 4.7μF, X5R, 10V, 20%, 0402, AEC-Q200 MURATA, GRT155R61A475ME13D
4 8 C4, C8, C9, C17,
C26, C27, C32, C33
CAP., 0.1μF, X7R, 50V, 10%, 0402, AEC-Q200 MURATA, GCM155R71H104KE02D
5 1 C5 CAP., 0.47μF, X7S, 10V, 10%, 0402, AEC-Q200 MURATA, GCM155C71A474KE36D
6 1 C6 CAP., 4700pF, X7R, 25V, 10%, 0402, AEC-Q200 YAGEO, AC0402KRX7R8BB472
7 4 C7, C13, C16, C19 CAP., 22μF, X7R, 16V, 20%, 1210, AEC-Q200 TDK, CGA6P1X7R1C226M250AC
8 4 C10, C11, C22, C23 CAP., 10μF, X7S, 50V, 10%, 1210, AEC-Q200 MURATA, GCM32EC71H106KA03L
9 1 R3 RES., 10k, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF1002X
10 1 R4 RES., 143k, 1%, 1/16W, 0402 VISHAY, CRCW0402143KFKED
11 1 R5 RES., 12k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040212K0FKED
12 1 R7 RES., 402k, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF4023X
13 1 R12 RES., 84.5k, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF8452X
14 2 R13, R14 RES., 100k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
15 1 R22 RES., 110k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402110KFKED
Optional Low EMI Components
16 1 L2 (REMOVE AND
SHORT)
IND., 2.2μH, PWR, SHIELDED, 20%, 9.7A, 14.5mΩ, 5.48mm ×
5.28mm, XAL5030, AEC-Q200
COILCRAFT, XAL5030-222MEB
17 1 C12 (REMOVE) CAP., 10μF, X7S, 50V, 10%, 1210, AEC-Q200 MURATA, GCM32EC71H106KA03L
18 1 C29 (REMOVE) CAP., 4.7μF, X7R, 16V, 10%, 0805, AEC-Q200 MURATA, GCM21BR71C475KA73L
19 1 FB3 (REMOVE AND
SHORT)
IND., 220Ω AT 100MHz, FERRITE BEAD, 25%, 3A, 40mΩ, 0805,
AEC-Q200
TDK, MPZ2012S221ATD25
20 0 C1, C2, C20, C21 CAP., OPTION, 1210
21 0 C14, C28 CAP., OPTION, 0805
22 0 FB1, FB2 IND., 220Ω AT 100MHz, FERRITE BEAD, 25%, 3A, 40mΩ, 0805,
AEC-Q200
TDK, MPZ2012S221ATD25
Optional Electrical Components
23 1 R1 (REMOVE AND
SHORT)
RES., 0.010Ω, 1%, 1W, 0805 LONG-SIDE, AEC-Q200,
CURRENTSENSE
SUSUMU, KRL2012E-M-R010-F-T5
24 2 R2, R10 (REMOVE
AND SHORT)
RES., 0Ω, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04020000Z0ED
25 1 R17 (REMOVE) RES., 3.01k, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF3011X
26 1 VR1 (REMOVE) RES., 20k, 20%, 1/8W, SMD 3mm SQ, 1-TURN, TOP ADJ., TRIMPOT BOURNS, 3313J-1-203E
27 0 R8, R9, R11, R15,
R16, R18-R20
RES., OPTION, 0402

8
DEMO MANUAL
EVAL-LT8350-AZ
Rev. 0
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
28 0 M1 XSTR., OPTION, MOSFET, P-CH, SOT-23
29 0 C15, C18, C25 CAP., OPTION, 0402
30 0 C24 CAP., 68μF, ALUM POLY, 50V, 20%, SMD, 8.0mm × 10.0mm NICHICON, GYA1H680MCQ1GS
31 0 C30 CAP., 47μF, ALUM POLY, 16V, 20%, SMD, 5.0mm × 5.8mm,
AEC-Q200
UNITED-CHEMI-CON, HHXC160ARA470ME61G
Hardware : For Evaluation Circuit Only
32 1 JP1 CONN., HDR, MALE, 2×4, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000821121
33 1 JP2 CONN., HDR, MALE, 1×3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000311121
34 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2-POS, 2mm WURTH ELEKTRONIK, 60800213421
35 10 E1, E4-E7, E9,
E12-E14, E16
TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2308-2-00-80-00-00-07-0
36 5 E2, E3, E10,
E11,E15
TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2501-2-00-80-00-00-07-0
PARTS LIST

9
DEMO MANUAL
EVAL-LT8350-AZ
Rev. 0
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.
SCHEMATIC DIAGRAM
1. ALL RESISTORS ARE 0402, 5%. ALL CAPACITORS ARE 0402
NOTE: UNLESS OTHERWISE SPECIFIED
350kHz
VIN
INTVCC
VREF
VIN
INTVCC
INTVCC
FB3
MPZ2012S221ATD25
R18
OPT
C29
4.7uF
16V
0805
R10 0
R19 OPT
R7 402k
E11
OUT
12V 2.5A
E1
EXTVCC
R12
84.5k
E13
CTRL
E10
GND
C23 10uF 50V 1210
C8
0.1uF
50V
R9 OPT
C22 10uF 50V 1210
C27 0.1uF
L1
6.8uH
XAL6060-682MEB
21
E3
VIN
3V - 36V
R4
143k
C16
22uF
16V
1210
C4
0.1uF
C26 0.1uF 50V C33
0.1uF E15 GND
E14
CLKOUT
C1 OPT 1210
C9
0.1uF
50V
FB1
MPZ2012S221ATD25
OPT
+
C30
HHXC160ARA470ME61G
OPT
M1 OPT
3
1
2
C19
22uF
16V
1210
C32
0.1uF
50V
L2
2.2uH
XAL5030-222MEB
1 2
R8
OPT
R22
110K
C11 10uF 50V 1210
VR1 20k
3313J-1-203E
13
2
C2 OPT 1210
C12 10uF 50V 1210
R2
0
TP1
LOADEN
C10 10uF 50V 1210
R20 OPT
R1
0.010
KRL2012
+
C24
GYA1H680MCQ1GS
OPT
E2
GND
C25 OPT
R11 OPT
JP1
SYNC/MODE
FCM + SSFM
DCM + NO SSFM
DCM + SSFM
FCM + NO SSFM
1 2 3 4 5 6 7 8
R15 OPT
E6
GND
R5
12k
C6
4700pF
JP2
COMP
RC RC+FF
1 3 2
C15 OPT
C5
0.47uF
10V
C3
4.7uF
10V
E7
GND
E12
VOUT
C14 OPT 0805
R14
100k
R3
10k
E9
ISMON
R13
100k
C20 OPT 1210
FB2 0805 OPT
E4
EN/UVLO
U1
LT8350RV
VIN
2
VIN
3
EN/UVLO
5
INTVCC
6
RP
7
LOADEN
8
VREF
9
CTRL
13
PGOOD
16
SS
17
ISMON 10
ISP 11
ISN 12
FB 14
VC 15
RT 18
SYNC/MODE 19
CLKOUT 20
EXTVCC 21
LOADTG 22
VOUT 24 VOUT 25
SW2 27
SW2 28
BST2 29
BST1 30
SW1 31
SW1 32 GND
33
GND
34
GND
35
GND
36
E16
SGND
E5
PGOOD
______
C21 OPT 1210
C28 OPT
0805
C17
0.1uF
50V
R17
3.01k
R16 OPT
C13
22uF
16V
1210
C7
22uF
16V
1210
C18 OPT
VREF

10
DEMO MANUAL
EVAL-LT8350-AZ
Rev. 0
 ANALOG DEVICES, INC. 2022
04/22
www.analog.com
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.
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