1
dc2469af
DEMO MANUAL DC2469A
DESCRIPTION
LT8603
42V, Low IQ, Quad Output Triple Monolithic
Buck Converter with Boost Channel as SEPIC
Demonstration circuit 2469A features the LT
®
8603 with
triple monolithic buck regulators and the boost channel as
SEPIC. The demo circuit is designed for 8V, 5V, 3.3V, and
1.8V outputs from a nominal 12V input. The 4th channel is
set as a SEPIC converter and its output is regulated at 8V
over a wide input range. The two high voltage buck regula-
tors are powered from VOUT4. VOUT1 is regulated at 5V
with 1.5A maximum output load current, and VOUT2 is
at 3.3V with 2.5A maximum output load current. The low
voltage buck is powered from VOUT2 (3.3V), and the out-
put VOUT3 is regulated at 1.8V with 1.8A maximum load
current. Thanks to the SEPIC converter, all four outputs
can ride through a cold crank in automotive applications
while providing regulated output voltages.
All regulators are synchronized to an internal oscillator
that can be programmed with one resistor at RT pin.
Programmable frequency allows optimization between
efficiency and external component size. To avoid the audio
band, the DC2469A sets the switching frequency at 2MHz
for the three buck regulators, and the SEPIC converter is
at 400kHz. At all frequencies, a 180° phase shift is main-
tained between 1 and 2 channels, reducing the input peak
current and voltage ripple.
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
Many popular features such as soft-start, cycle-by-cycle
current limit, power good for each of the four channels
are packed in the 40-lead 6mm × 6mm QFN package to
simplify the complex design of quad-output power con-
verters. Each buck regulator can be independently dis-
abled using its own TRKSS or RUN pin. The SEPIC can be
disabled by pulling down both the FSEL4A and FSEL4B.
The EN/UVLO can be used to shut down the circuit to
reduce the input current to 1µA.
Table 1 summarizes the performance of the demo board at
room temperature. The demo circuit can be easily modi-
fied for various automotive, transportation and industry
applications. For applications that need 4th channel con-
figured as a boost converter, the DC2114A should be used.
The LT8603 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for DC2469A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2469A
Specifications are at TA = 25°C
Table 1.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operation Input Voltage Range 3 12 42 V
Minimum Start-Up, VINMIN 4.5 V
Standby Current When Switching IOUT1,2,3,4 = 0mA, VIN = 12V 40 µA
Channel 4 Output Voltage, VOUT4 IOUT4 = 1A 7.68 8 8.32 V
Channel 1 Output Voltage, VOUT1 IOUT1 = 1.5A 4.86 5 5.14 V
Channel 2 Output Voltage, VOUT2 IOUT2 = 2.5A 3.17 3.3 3.43 V
Channel 3 Output Voltage, VOUT3 IOUT3 = 1.8A 1.73 1.8 1.87 V
Maximum Output Current, IOUT1 VIN = 12V 1.5 A
Maximum Output Current, IOUT2 VIN = 12V, IOUT3 = 0A 2.5 A
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dc2469af
DEMO MANUAL DC2469A
QUICK START PROCEDURE
Demonstration circuit 2469A is easy to set up to evalu-
ate the performance of the LT8603. Refer to Figure 1 for
proper equipment setup and follow these procedures.
1. With power off, connect the input power supply to the
board through VIN and GND terminals on the top layer.
Connect the loads to the terminals VOUT1 and GND,
VOUT2 and GND, VOUT3 and GND on the board. The
default positions of the headers are given in Table 2.
Table 2. Default Positions of the Headers
NAME POSITION
EN/UVLO JP4 ON
TRKSS1 JP1 ON
TRKSS2 JP2 ON
RUN3 JP3 RUN
2. Turn on the power at the input. Increase VIN to 4.5V.
Make sure that the input voltage is always within spec.
Refer to data sheet on the switching in high VIN condi-
tion and the Burst Mode
®
operation in light load. The
minimum start-up voltage for the SEPIC converter (and
the board) is 4.5V. Once it starts, the circuit runs with
input going down below 3V at light load.
3. Check for the proper switching frequency and output
voltage at channel 4. The output is set at 8V (±4%).
The SEPIC converter output current capability depends
on the input voltage. If the 4th output is not regulated,
temporarily disconnect the load, and disable the two
high voltage buck regulators (channels 1, 2) as well.
Check if the EN/UVLO is set in correct position. Check
if too much load is applied to VOUT4. SEPIC does not
have overcurrent or short-circuit protection capability.
NOTE: By default, the switching frequency of the SEPIC
converter is optimized with 400kHz with FSEL4A low
and FSEL4B high. The switching frequency can be
changed with RT, or different FSEL4A / FSEL4B set-
tings. An accompanying change of inductors might
be necessary to achieve desirable performance of the
converter.
4. Check for the proper output voltages of the buck regu-
lators. The output should be regulated at 5V (±4%),
3.3V (±4%), 1.8V (±4%) for the channels 1, 2 and
3, respectively. Do not overload the buck regulators
simultaneously at high line unless proper thermal cool-
ing method such as air flow or heat sink is applied.
If there is no output, temporarily disconnect the load
of the corresponding channels to make sure that the
PERFORMANCE SUMMARY
Table 1.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Output Current, IOUT3 VIN = 12V, IOUT2 = 0A 1.8 A
Maximum Output Current, IOUT4 VIN = 12V, IOUT1,2,3 = 0A 1.5 A
Switching Frequency, Channel 1~3 VIN = 12V, IOUT1,2,3 = 1A 1.85 2 2.15 MHz
Switching Frequency, Channel 4 VIN = 6V, IOUT4 = 1A 370 400 430 kHz
Efficiency, Channel 4 VIN = 7V, IOUT4 = 2.5A 84 %
Efficiency, CH1, 5V VIN = 12V, IOUT1 = 1.5A 89 %
Efficiency, CH2, 3.3V VIN = 12V, IOUT2 = 2.5A 84 %
Efficiency, CH3, 1.8V PVIN3 = 3.3V, IOUT3 = 1.8A 83 %
Efficiency, Overall VIN = 14V, IOUT1,2,3 = 1A 75 %
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dc2469af
DEMO MANUAL DC2469A
loads are not set too high, and the headers of EN/UVLO,
TRKSS1, TRKSS2, RUN3 are set in right positions.
5. Once the proper output voltage is established, adjust
the input voltage and load currents within the operating
range, and observe the output voltage regulation, tran-
sient, ripple voltage, efficiency and other parameters.
By default the circuit is set in low ripple Burst Mode
operation with SYNC grounded. Remove R11, and add
0Ω at R10, the circuit is set in pulse-skipping mode.
The circuit runs in full frequency with lower load cur-
rent in this mode. To synchronize to an external clock,
apply the external clock to the SYNC turret.
QUICK START PROCEDURE
6. When measuring the input or output voltage ripples,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output volt-
age ripple by touching the probe tip directly across the
V
IN
or V
OUT
capacitor terminals. See Figure 2 for proper
scope probe technique.
NOTE: Refer to the thermal derating curves in LT8603
data sheet for high input voltage and/or high ambient
temperature operations.
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dc2469af
DEMO MANUAL DC2469A
Figure 1. Proper Measurement Equipment Setup
QUICK START PROCEDURE
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dc2469af
DEMO MANUAL DC2469A
Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple
Figure 3. Thermal Image Top View, IOUT1 = 1A, IOUT2 = 1A, IOUT3 = 1A, TA = 25°C, FSW = 2MHz
A) VIN = 6V B) VIN = 24V
QUICK START PROCEDURE
V
IN
OR V
OUT
GND
6
dc2469af
DEMO MANUAL DC2469A
QUICK START PROCEDURE
f
SW
= 2MHz
V
IN
= 8V
LOAD CURRENT (A)
0
1
2
50
58
67
75
83
92
100
EFFICIENCY (%)
CH1, CH2 Efficiency
DC2469A F04a
f
SW
= 400kHz
V
IN
= 7V
Burst Mode OPERATION
PULSE-SKIPPING MODE
LOAD CURRENT (A)
0
1
2
30
40
50
60
70
80
90
EFFICIENCY (%)
Efficiency, V
OUT
= 8V
DC2469A F04b
Figure 4. Load Transient from 50mA to 450mA at VOUT4, VIN = 5V, FSW = 400kHz, Burst Mode Operation
Figure 5. SEPIC Maximum Output Current vs Input Voltage
RSENSE = 0.008
VIN (V)
4
6
8
0
1
2
3
4
5
IOUT (A)
Output Current
DC2469A F05
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dc2469af
DEMO MANUAL DC2469A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CVIN Cap, X5R 1µF 50V 10% 0603 Murata, GRM188R61H105KAALD
2 2 C26, C27 Cap, X7R 4.7µF 50V 10% 1206 Murata, GRM31CR71H475KA12L
3 2 CVIN1, CVIN2 Cap, X7R 4.7µF 16V 10% 0805 Murata, GRM21BR71C475KA73L
4 1 CVIN3 Cap, X5R 10µF 6.3V 20% 0603 Murata, GRM188R60J106ME47D
5 4 CVIN4, CVIN5, CVIN6, CVIN7 Cap, X5R 10µF 50V 10% 1206 Murata, GRM31CR61H106KA12L
6 1 C1 Cap, Alum 22µF 50V 10% Sun Elect Ind, 50CE22BSS
7 3 C2, C3, C32 Cap, X7R 0.1µF 50V 10% 0402 Murata, GRM155R71H104KE14J
8 2 C6, C9 Cap, X5R 47µF 16V 10% 1210 Murata, GRM32ER61C476KE15K
9 1 C7 Cap, Alum 47µF 16V 20% Sun Elect Ind, 16CE47BS
10 1 C8 Cap, X7R 0.1µF 50V 10% 0603 Murata, GRM188R71H104KA93D
11 2 C10, C17 Cap, X7R 0.1µF 16V 10% 0402 Murata, GRM155R71C104KA88D
12 2 C11, C15 Cap, X7R 47nF 25V 20% 0603 Murata, GRM188R71C473KA01D
13 2 C12, C22 Cap, X5R 47µF 10V 10% 1206 Murata, GRM31CR61A476KE15L
14 3 C13, C19, C23 Cap, X7R 2.2µF 10V 10% 0402 Murata, GRM155R61A225KE95D
15 1 C18 Cap, X5R 100µF 6.3V 20% 1206 Murata, GRM31CR60J107ME39K
16 2 C20, C21 Cap, X7R 4.7µF 10V 10% 0603 Murata, GRM188R61A475KE15D
17 1 C25 Cap, C0G 1500pF 25V 5% 0603 Murata, GRM1885C1E152JA01D
18 1 C29 Cap, C0G 2.2pF 50V ±0.25pF 0603 Murata, GRM1885C1H2R2CA01D
19 1 C30 Cap, C0G 4.7pF 50V ±0.25pF 0603 Murata, GRM1885C1H4R7CA01D
20 1 C31 Cap, C0G 22pF 50V 5% 0603 Murata, GRM1885C1H220JA01D
21 2 C34, C38 Cap, X7R 10µF 50V 10% 1210 Murata, GRM32ER71H106KA12L
22 1 D1 Schottky Rectifier, 60V, 5A, SOT1289 Nexperia, PMEG060V050EPD
23 2 D2, D3 Schottky Rectifier, 0.2A, SOD523 NXP, PMEG6002EB
24 1 FB1 BEAD, 4A 1206 Wurth Elektronik, 742792150
25 1 L1 Res, Jumper, Chip, 0Ω 0805 Vishay, CRCW08050000Z0EA
26 1 L2 Inductor, 3.3µH XEL4030 Coilcraft, XEL4030-332ME
27 1 L3 Inductor, 1.5µH XEL4030 Coilcraft, XEL4030-152ME
28 1 L4 Inductor, 1µH NPIM42P NIC Comp Corp, NPIM42P1R0MTRF
29 1 L5 Inductor, 1.5µH Wurth Elektronik, 7448700015
30 1 Q1 MOSFET-N Channel, PG-TSDSON-8 Infineon, BSZ067N06LS3 G
31 1 R1 RES, CHIP, 0.008, 1W, 1%, 0815 Susumu, RL3720WT-R008-F
32 4 R2, R3, R4, R5 Res, Chip 24.9k 0.1W 1% 0603 Vishay, CRCW060324K9FKEA
33 1 R6 Res, Chip 3.32M 0.1W 1% 0603 Vishay, CRCW06033M32FKEA
34 1 R7 Res, Chip 365k 0.1W 1% 0603 Vishay, CRCW0603365KFKEA
35 1 R8 Res, Chip 806k 0.1W 1% 0603 Vishay, CRCW0603806KFKEA
36 5 R9, R11, R13, R14, R19 Res, Chip 200k 0.1W 1% 0603 Vishay, CRCW0603200KFKEA
37 1 R12 Res, Chip 464k 0.1W 1% 0603 Vishay, CRCW0603464KFKEA
38 1 R15 Res, Chip 1M 0.1W 1% 0603 Vishay, CRCW06031M00FKEA
39 1 R16 Res, Chip 30.1k 0.1W 1% 0603 Vishay, CRCW060330K1FKEA
40 1 R17 Res, Chip 187k 0.1W 1% 0603 Vishay, CRCW0603187KFKEA
41 1 R18 Res, Chip 150k 0.1W 1% 0603 Vishay, CRCW0603150KFKEA
8
dc2469af
DEMO MANUAL DC2469A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
42 1 R23 Res, Chip 2.49M 0.1W 1% 0603 Vishay, CRCW06032M49FKEA
43 1 R21 Res, Chip 10k 0.1W 1% 0603 Vishay, CRCW060310K0FKEA
44 6 R24, R27, R32, R33, R36, R37 Res, Jumper, Chip, 0Ω 0603 Vishay, CRCW06030000Z0EA
45 1 R34 Res, Jumper, Chip, 0Ω 0805 Vishay, CRCW08050000Z0EA
46 1 U1 IC, Buck Regulator QFN (40) (UJ) Analog Device, LT8603EUJ
Additional Demo Board Circuit Components
1 0 C4, C5 Cap, 0402
2 0 C14, C16, C28, C36, C37, C41, C43 Cap, 0603
3 0 C33 Cap, 1206
4 0 Q2 NPN. MMBT3904, SOT-23
5 0 R10, R20, R25, R26, R29, R30, R31,
R35, R38, R39
Res, 0603
6 0 R28 Res, 1210
7 0 U2 IC, LTC6908CS6-1 TSOT-23-6 Analog Device, LTC6908CS6-1#PBF
Hardware: For Demo Board Only
1 20 E1 to E20 Turret, Testpoint Mill Max, 2501-2-00-80-00-00-07-0
2 5 JP1, JP2, JP3, JP4, JP5 Headers, 3 Pins 2mm Ctrs Wurth Elektronik, 62000311121
3 5 XJP1, XJP2, XJP3, XJP4, XJP5 Shunt, 2mm Ctrs Samtec, 2SN-BK-G
4 4 MH1 to MH4 STAND-OFF, NYLON 0.25" Tall (SNAP ON) Wurth Electronik, 702931000
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dc2469af
DEMO MANUAL DC2469A
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
5
5
4
4
3
3
2
2
1
1
DD
CC
B B
A A
NOTE: UNLESS OTHERWISE SPECIFIED.
1. All Resistors and Capacitors 0603.
See Demo Manual for details on VOUT2 and VOUT4
current capability.
(2MHz)
*
*
*
OPTIONAL CIRCUIT
OPTIONAL CIRCUIT
INTVCC4
INTVCC
INTVCC
INTVCC
INTVCC
SYNC
SYNC
VOUT1
INTVCCINTVCC
INTVCC
VOUT1
VOUT1
INTVCC4
D2
PMEG6002EB
E13 VOUT2
3.3V / 1.5A
JP3
RUN
EXT
RUN3
1
3
2
C4
OPT
0402
C20 4.7µF
10V 0603
D3
PMEG6002EB
E6
PG2
CVIN3
10µF
C18
100uF
6.3V
1206
R14
200k
1%
C5
OPT
0402
C16
(Opt)
R10
OPT
C38
R19
200k
1%
E8
PG4
R34
0
C22
47µF
10V
X5R
1206
FB1
742792150
E18
GND
+
C1
22µF
50V
C32
0.1µF
50V
0402
Q2
OPT
MMBT3906
1
32
C30
4.7pF
C25
1500pF
C17
0.1µF
25V
0402
L5-2
1.5uH
7448700015
2 4
C36
OPT
E9 VOUT1
5V / 1.5A
+
C7
47µF
16V
C28
(Opt)
C6
47uF
16V
1210
JP4
OFF
ON
EN/UVLO
1
3
2
R39
OPT
R2
24.9k
1%
C14
(Opt)
Q1
BSZ067N06LS3 G
R20
OPT
C26
4.7µF
50V
1206
R27
0
R33
0
R17
187k
1%
R38
OPT
C27
4.7µF
50V
1206
E4
GND
L1
0
0805
C37
OPT
C15
47nF
X7R
R35
OPT
0
R3
24.9k
1%
R13
200k
1%
E17
SYNC
C13
2.2µF
0402
10V
C23
2.2µF
0402
10V
C43
OPT
C12
47µF
10V
X5R
1206
R30
OPT
JP5
VOUT2
VOUT1
1
3
2
C2
0.1µF
0402
R37
0
C10
0.1µF
25V
0402
C31
22pF
E12
TRKSS2
E15
RUN3
CVIN6
L3
1.5µH
XEL4030-152ME
CVIN7
E14
GND
C11
47nF
X7R
R25
OPT
R32 0
E19
RST
R7
365k
1%
E7
PG3
R24
0
U2
OPT
LTC6908CS6-1
V+
1
OUT1 6
GND
2MOD 4
SET3
OUT2 5
R5
24.9k
1%
R23
2.49M
CVIN4 10µF
50V
X7R
1206
D1
PMEG060V050EPD
E16 VOUT3
1.8V / 1.5A
C34
10µF
50V
1210
JP2
OFF
ON
TRKSS2
1
3
2
R6
3.32M
1%
E10
TRKSS1 C29
2.2pF
R11
200k
1%
CVIN1
4.7µF
0805
E3
GND
C19
2.2µF
0402
10V
E11
GND
R16
30.1k
1%
R21
10k
1%
JP1
OFF
ON
TRKSS1
1
3
2
L5-1
1.5uH
7448700015
1
3
C21 4.7µF
10V 0603
C41
OPT
E5
PG1
R31 OPT
1%
49.9K
CVIN5
C33
OPT
50V
1206
R28
OPT
1210
R26
OPT
CVIN
1uF 50V
E2 VOUT4
8V / 1.5A
R9
200k
1%
R36
0
CVIN2
4.7µF
0805
R15
1M
U1
LT8603EUJ
GND
13
SW3 36
BST1 4
FB1 26
PVIN1 37
SW1 3
GND
8
SW2 6
BST2 5
FB2 25
SYNC
33
FB3 27
GATE4 15
FB4 24
RT
29
INTVCC
28
VIN
23
EN/UVLO
22
PG1
1
TRKSS1
21
TRKSS2
20
RUN3
30
ISN4 18
GND
2
BIAS
9
PVIN3 34
PG2
10
PG3
40
PG4
11
RST
32
ISP4 19
PVIN2 14
INTVCC4
16
GND
35
GND
38
GND
41
SW2 7
CPOR
31
POREN
39
FSEL4A
12
FSEL4B
17
C3
0.1µF
0402
R8
806k
1%
E20
POREN
E1
VEMI+
3V - 42V
R29
OPT
R12
464k
1%
C8
0.1uF
16V
L4
1.0µH
NIC Comp. Corp.
NPIM42P1R0MTRF
C9
47uF
16V
1210
R18
150k
1%
R1 0.008
0815 1%
L2
3.3µH
XEL4030-332ME
R4
24.9k
1%
VOUT3
VOUT4
PG1
PG2
PG3
PG4
VEMI
PG3
VIN
VIN
VOUT4
VOUT1
VOUT2
ISN4
ISN
ISN4
PG4
10
dc2469af
DEMO MANUAL DC2469A
LT 0118 • PRINTED IN USA
ANALOG DEVICES, INC. 2018
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
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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 Evaluation
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”)
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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
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