AP64501SP-EVM
40V, 5A, Low IQ, Synchronous DC/DC Buck Converter
with Programmable Soft-Start Time
DESCRIPTION
The AP64501 is 5A, synchronous buck
converter with a wide input voltage range of
3.8V to 40V. The device fully integrates a
45mΩ high-side power MOSFET and a
20mΩ low-side power MOSFET to provide
high-efficiency
step-down
DC/DC
conversion.
switching frequency jitter of ±6%, which
reduces EMI by not allowing emitted energy
to stay in any one frequency for a significant
period of time. It also has a proprietary gate
driver scheme to resist switching node
ringing without sacrificing MOSFET turn-on
and turn-off times, which reduces highfrequency radiated EMI noise caused by
MOSFET switching.
The AP64501 device is easily used by
minimizing the external component count
due to its adoption of peak current mode
control.
The device is available in a SO-8EP
package.
The AP64501 design is optimized for
Electromagnetic
Interference
(EMI)
reduction.
The
converter
features
Frequency Spread Spectrum (FSS) with a
FEATURES
Wide Input Range: 3.8V to 40V
5A Continuous Output Current
0.8V ±1% Reference Voltage
25µA Ultralow Quiescent Current
(Pulse Frequency Modulation)
570kHz Switching Frequency
Programmable Soft-Start Time
Proprietary Gate Driver Design for
Best EMI Reduction
Frequency
Spread
Spectrum
(FSS) to Reduce EMI
Low-Dropout (LDO) Mode
Precision Enable Threshold to
adjust UVLO
AP64501SP-EVM
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Protection Circuitry
o Undervoltage Lockout
(UVLO)
o Output Overvoltage
Protection (OVP)
o Cycle-by-Cycle Peak
Current Limit
o
Thermal Shutdown
Totally Lead-Free & Fully RoHS
Compliant
Halogen and Antimony Free.
“Green” Device
June 2019
© Diodes Incorporated
AP64501SP-EVM
40V, 5A, Low IQ, Synchronous DC/DC Buck Converter
with Programmable Soft-Start Time
APPLICATIONS
5V, 12V, and 24V Distributed Power Bus Supplies
White Goods and Small Home Appliances
Home Audio
Network Systems
Consumer Electronics
Cordless Power Tools
Optical Communication and Networking Systems
General Purpose Point of Load
TYPICAL APPLICATIONS CIRCUIT
Figure 1. Typical Application Circuit
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VIN
Supply Pin Voltage
VBST
Bootstrap Pin Voltage
VSW - 0.3 to VSW + 6.0
V
VEN
Enable/UVLO Pin Voltage
-0.3 to +42.0
V
VSS
Soft-Start Pin Voltage
-0.3 to +6.0
V
VFB
Feedback Voltage
-0.3V to +6.0
V
VCOMP
Compensation Pin Voltage
-0.3 to +6.0
V
VSW
Switch Node Voltage
TJ
Junction Temperature
+160
°C
TL
Lead Temperature
+260
°C
AP64501SP-EVM
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Rating
Unit
-0.3 to +42.0 (DC)
V
-0.3 to +45.0 (400ms)
-0.3 to VIN + 0.3 (DC)
-2.5 to VIN + 2.0 (20ns)
June 2019
© Diodes Incorporated
V
AP64501SP-EVM
40V, 5A, Low IQ, Synchronous DC/DC Buck Converter
with Programmable Soft-Start Time
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Max
Unit
VIN
Supply Voltage
3.8
40
V
VOUT
Output Voltage
0.8
39
V
TA
Operating Ambient Temperature Range
-40
+85
°C
TJ
Operating Junction Temperature Range
-40
+125
°C
EVALUATION BOARD
Figure 2. AP64501SP-EVM
AP64501SP-EVM
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© Diodes Incorporated
AP64501SP-EVM
40V, 5A, Low IQ, Synchronous DC/DC Buck Converter
with Programmable Soft-Start Time
QUICK START GUIDE
The AP64501SP-EVM has a simple layout and allows access to the appropriate signals through
test points. To evaluate the performance of the AP64501SP, follow the procedure below:
1. Connect a power supply to the input terminals VIN and GND. Set VIN to 12V.
2. Connect the positive terminal of the electronic load to VOUT and negative terminal to GND.
3. For Enable, place a jumper at JH6 to “ON” position to connect EN pin to VIN through 100KΩ
resistor to enable IC. Jump to “OFF” position to disable IC.
4. The evaluation board should now power up with a 5.0V output voltage.
5. Check for the proper output voltage of 5.0V (±1%) at the output terminals VOUT and GND.
Measurement can also be done with a multimeter with the positive and negative leads
between VOUT and GND.
6. Set the load to 5A through the electronic load. Check for the stable operation of the SW
signal on the oscilloscope. Measure the switching frequency.
MEASUREMENT/PERFORMANCE GUIDELINES:
1) When measuring the output voltage ripple, maintain the shortest possible ground lengths
on the oscilloscope probe. Long ground leads can erroneously inject high frequency
noise into the measured ripple.
2) For efficiency measurements, connect an ammeter in series with the input supply to
measure the input current. Connect an electronic load to the output for output current.
SETTING OUTPUT VOLTAGE:
Table 1 shows a list of recommended component selections for common output voltages.
VOUT
R1
R2
L1
R7
C7
C1, C2
C5, C6, C12
1.2V
11KΩ
22.1KΩ
1.5µH
3.74KΩ
2.7nF
2x10µF
3x22µF
1.5V
19.6KΩ
22.1KΩ
2.2µH
4.75KΩ
2.7nF
2x10µF
3x22µF
1.8V
27.4KΩ
22.1KΩ
2.2µH
5.62KΩ
2.7nF
2x10µF
3x22µF
2.5V
47.5KΩ
22.1KΩ
3.3µH
7.87KΩ
2.7nF
2x10µF
3x22µF
3.3V
69.8KΩ
22.1KΩ
3.3µH
10.5KΩ
2.7nF
2x10µF
3x22µF
5.0V
115KΩ
22.1KΩ
3.6µH
15.8KΩ
2.7nF
2x10µF
3x22µF
12V
309KΩ
22.1KΩ
10µH
37.4KΩ
2.7nF
2x10µF
3x22µF
Table 1. Common Output Voltages
AP64501SP-EVM
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June 2019
© Diodes Incorporated
AP64501SP-EVM
40V, 5A, Low IQ, Synchronous DC/DC Buck Converter
with Programmable Soft-Start Time
EVALUATION BOARD SCHEMATIC
Figure 3. AP64501SP-EVM Schematic
PCB TOP LAYOUT
Figure 4. AP64501SP-EVM – Top Layer
AP64501SP-EVM
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© Diodes Incorporated
AP64501SP-EVM
40V, 5A, Low IQ, Synchronous DC/DC Buck Converter
with Programmable Soft-Start Time
PCB BOTTOM LAYOUT
Figure 5. AP64501SP-EVM – Bottom Layer
AP64501SP-EVM
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© Diodes Incorporated
AP64501SP-EVM
40V, 5A, Low IQ, Synchronous DC/DC Buck Converter
with Programmable Soft-Start Time
BILL OF MATERIALS for AP64501SP-EVM for VOUT=5V
Ref
Value
C1, C2
10µF
C3, C4
0.1µF
C5, C6,
C12
22µF
C7
2.7nF
C8
10nF
C9
0.1µF
R1
115KΩ
R2
22.1KΩ
R3
0Ω
R4
100KΩ
R7
15.8KΩ
R8
0Ω
L1
3.6µH
JH6
JH13,
JH14,
JH15,
JH16
1598
U1
AP64501
AP64501SP-EVM
Document number: Rev. 1 - 0
Description
Ceramic
Capacitor, 50V,
X7R, 10%
Ceramic
Capacitor, 50V,
X7R, 10%
Ceramic
Capacitor, 16V,
X7R
Ceramic
Capacitor, 50V,
X7R
Ceramic
Capacitor, 25V,
X7R
Ceramic
Capacitor, 25V,
X7R
RES SMD 1%
1/8W
RES SMD 1%
1/8W
RES SMD 1%
1/10W
RES SMD 1%
1/10W
RES SMD 1%
1/10W
RES SMD 1%
1/10W
DCR=12.2mΩ,
Ir=8.2A
PCB Header, 40
POS
Terminal Turret
Triple 0.094" L
(Test Points)
Sync DC/DC
Converter
Qty
Size
Vendor
Name
Manufacturer PN
2
1206
Samsung
CL31B106KBHNNNE
2
0603
Wurth
Electronics
885012206095
3
1210
Samsung
CL32B226KOJNNNE
1
0603
Murata
GRM1885C1H272JA01D
1
0603
Wurth
Electronics
885012206065
1
0603
Wurth
Electronics
885012206071
1
0603
Panasonic
ERJ-3EKF1153V
1
0603
Stackpole
RNCP0603FTD22K1
1
0603
Vishay
CRCW06030000Z0EAC
1
0603
Vishay
CRCW0603100KFKEA
1
0603
Bourns Inc
CR0603-FX-1582ELF
1
Vishay
Wurth
Electronics
CRCW06030000Z0EAC
1
0603
10.2x10.2x
4.5mm
1
1X3
3M
2340-611TG
4
ThroughHole
Keystone
Electronics
1598-2
1
SO-8EP
Diodes Inc
AP64501SP
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June 2019
© Diodes Incorporated
AP64501SP-EVM
40V, 5A, Low IQ, Synchronous DC/DC Buck Converter
with Programmable Soft-Start Time
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 6. Efficiency vs Output Current
Figure 7. Load Transient, 3A to 5A
Figure 8. Output Voltage Ripple, IOUT=5A
Figure 9. Output Short Protection, IOUT=5A
AP64501SP-EVM
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© Diodes Incorporated
AP64501SP-EVM
40V, 5A, Low IQ, Synchronous DC/DC Buck Converter
with Programmable Soft-Start Time
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS
DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other
changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any
liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated
convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products
described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the
companies whose products are represented on Diodes Incorporated website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized
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This document is written in English but may be translated into multiple languages for reference. Only the English version of this
document is the final and determinative format released by Diodes Incorporated.
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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems
without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided
in the labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected
to cause the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or
systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements
concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems,
notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further,
Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes
Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2019, Diodes Incorporated
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AP64501SP-EVM
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