EE­Sim
DC­DC
Initial Design
1.0
Design Requirements
Parameter
Value
Minimum Input Voltage
4.5V
Maximum Input Voltage
5.5V
Nominal Input Voltage
5V
Input Voltage Ripple
3%
Output Voltage Programming
External Resistive Divider
Output Voltage
1.8V
Output Current
2A
Output Voltage Ripple
1%
Load Step Start Current
1A
Load Step Current
2A
Output Voltage Load Step Over/Undershoot
5%
Performance Priority
Balance Efficiency and Size
BOM Priority
Cost
Switching Frequency
800kHz
Operating Mode
PWM mode
Inductor Current Ratio (LIR)
0.3
© 2024 Analog Devices Inc. All rights reserved.
Page 1 of 19
EE­Sim
DC­DC
Schematic
BOM
Ref
Qty
Part Number
U1
1
MAX15039ETG+
C1
1
CL05B222KB5NNNC
C2
1
CC0603JRNPO9BN680
Yageo
C3
1
CC0603JRNPO9BN102
Yageo
C4
1
CC0603KRX7R9BB333
Yageo
C5
1
CC1210KKX7R9BB475
Yageo
C6
4
GRM21BR71E225KE11L
C8
2
GRM188C80G226ME15J
C10
1
CC0603KRX7R9BB333
Yageo
C11
1
CC0603JRNPO9BN102
Yageo
784771022
Wuerth
Elektronik
GmbH & Co.
KG
L1
1
© 2024 Analog Devices Inc. All rights reserved.
Manufacturer
Description
Analog
Devices
Samsung
Electro­
Mechanics
6A, 2MHz Step­Down Regulator with
Integrated Switches
Murata
Manufacturing
Murata
Manufacturing
Cap Ceramic 0.0022uF 50V X7R 10% Pad
SMD 0402 125°C T/R
Cap Ceramic 68pF 50V C0G 5% Pad SMD
0603 125°C T/R
Cap Ceramic 0.001uF 50V C0G 5% Pad
SMD 0603 125°C T/R
Cap Ceramic 0.033uF 50V X7R 10% Pad
SMD 0603 125°C T/R
Cap Ceramic 4.7uF 50V X7R 10% Pad
SMD 1210 125°C T/R
Cap 2.2uF 25V X7R 0805 10% 2.48mOhm
0.37nH Active
Cap 22uF 4V X6S 0603 20% 0.36mOhm
0.55nH Active
Cap Ceramic 0.033uF 50V X7R 10% Pad
SMD 0603 125°C T/R
Cap Ceramic 0.001uF 50V C0G 5% Pad
SMD 0603 125°C T/R
Inductor 2.2 uH 20% 12.5mOhm max
5.143Arms @20C 7.2Arms @40C
10.5Asat @­10% 6.3mmHt 151.29mm^2
WE­PDA Active
Res Thick Film 0603 5.1K Ohm 1%
Page 2 of 19
EE­Sim
DC­DC
R1
1
AC0603FR­075K1L
Yageo
R2
1
RC0603FR­07178RL
Yageo
R3
1
ERJ3EKF8061V
Panasonic
R4
1
ERJ3EKF4021V
Panasonic
R5
1
RC0603FR­0766K5L
Yageo
R6
1
ERJ3GEYJ203V
Panasonic
R10
1
RC0603FR­072R21L
Yageo
R18
1
ERJ3EKF1003V
Panasonic
0.1W(1/10W) ±100ppm/°C Pad SMD T/R
Automotive AEC­Q200
Res Thick Film 0603 178 Ohm 1%
0.1W(1/10W) ±100ppm/°C Pad SMD T/R
Res Thick Film 0603 8.06K Ohm 1%
0.1W(1/10W) ±100ppm/°C Pad SMD T/R
Automotive AEC­Q200
Res Thick Film 0603 4.02K Ohm 1%
0.1W(1/10W) ±100ppm/°C Pad SMD T/R
Automotive AEC­Q200
Res Thick Film 0603 66.5K Ohm 1%
0.1W(1/10W) ±100ppm/°C Pad SMD T/R
Res Thick Film 0603 20K Ohm 5%
0.1W(1/10W) ±200ppm/°C Pad SMD T/R
Automotive AEC­Q200
Res Thick Film 0603 2.21 Ohm 1%
0.1W(1/10W) ±200ppm/°C Pad SMD T/R
Res Thick Film 0603 100K Ohm 1%
0.1W(1/10W) ±100ppm/°C Pad SMD T/R
Automotive AEC­Q200
Simulation Results
AC Loop ­ Mon Jan 29 2024 09:11:57
© 2024 Analog Devices Inc. All rights reserved.
Page 3 of 19
EE­Sim
DC­DC
BODE
Default
Phase Margin: 59.86° at a crossover frequency of 69.6kHz
| 30
| 40
|
20
▼
| 60
| 70
| 80
| 90
| 100
| 110
|
50
© 2024 Analog Devices Inc. All rights reserved.
Page 4 of 19
EE­Sim
DC­DC
Efficiency ­ Mon Jan 29 2024 09:11:57
EFFICIENCY_PLOT
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 5 of 19
EE­Sim
DC­DC
POWER_LOSS_PLOT
Default
Losses
Cin ­ ESR
Control MOSFET ­ gate charge
Synchronous MOSFET ­ diode Vforward during dead time
Cout ­ ESR
Control IC ­ quiescent
Control MOSFET ­ Rds_on
Synchronous MOSFET ­ Coss
Control MOSFET ­ Coss
Control MOSFET ­ switching
Synchronous MOSFET ­ diode reverse recovery
Synchronous MOSFET ­ Rds_on
Lout ­ AC + DC
Synchronous MOSFET ­ gate charge
Component
Loss (W)
% of total
© 2024 Analog Devices Inc. All rights reserved.
Page 6 of 19
EE­Sim
DC­DC
Component
Loss (W)
% of total
Cin ­ ESR
0.062669
16
Control MOSFET ­ gate charge
0.02
5.1
Synchronous MOSFET ­ diode
Vforward during dead time
0.00128
0.3
Cout ­ ESR
0.000536
0.1
Control IC ­ quiescent
0.0055
1.4
Control MOSFET ­ Rds_on
0.049542
12.7
Synchronous MOSFET ­ Coss
0.00162
0.4
Control MOSFET ­ Coss
0.00162
0.4
Control MOSFET ­ switching
0.068966
17.6
Synchronous MOSFET ­ diode
reverse recovery
0.02
5.1
Synchronous MOSFET ­ Rds_on
0.068187
17.4
Lout ­ AC + DC
0.071473
18.3
Synchronous MOSFET ­ gate
charge
0.02
5.1
Total
0.391392
100
© 2024 Analog Devices Inc. All rights reserved.
Page 7 of 19
EE­Sim
DC­DC
Steady State ­ Mon Jan 29 2024 09:11:57
INPUT
Default
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Page 8 of 19
EE­Sim
DC­DC
IC
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 9 of 19
EE­Sim
DC­DC
OUTPUT
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 10 of 19
EE­Sim
DC­DC
SWITCHING
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 11 of 19
EE­Sim
DC­DC
Load Step ­ Mon Jan 29 2024 09:11:57
INPUT
Default
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Page 12 of 19
EE­Sim
DC­DC
IC
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 13 of 19
EE­Sim
DC­DC
OUTPUT
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 14 of 19
EE­Sim
DC­DC
SWITCHING
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 15 of 19
EE­Sim
DC­DC
Line Transient ­ Mon Jan 29 2024 09:11:57
INPUT
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 16 of 19
EE­Sim
DC­DC
IC
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 17 of 19
EE­Sim
DC­DC
OUTPUT
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 18 of 19
EE­Sim
DC­DC
SWITCHING
Default
© 2024 Analog Devices Inc. All rights reserved.
Page 19 of 19