infineon IR3889 Evaluation Board User Manual

infineon IR3889 Evaluation Board

Scope and purpose

• The IR3889 is a synchronous buck converter, providing a compact, high-performance and flexible solution in a small 5 mm x 6 mm power QFN package.
• Key features offered by the IR3889 include internal digital soft-start, precision 0.8 V reference voltage, Power Good (PGood), thermal protection, programmable switching frequency, enable input, input Under-Voltage
• Lockout (UVLO) for proper start-up, latched off or unlatched Over-Voltage Protection (OVP), and pre-bias startup.
• The output Over-Current Protection (OCP) function is implemented by sensing the voltage developed across the on-resistance of the synchronous MOSFET for optimum cost and performance and the current limit is thermally compensated.
• This user guide contains the schematic and Bill of Materials (BOM) for the EVAL_3889_1Vout engineering evaluation board. The guide describes operation and use of the evaluation board itself. Detailed application information for IR3889 is available in the IR3889 datasheet.

Intended audience

This document is intended as a guide for design engineers evaluating the performance of IR3889 with the engineering EVAL_3889_1Vout demo board.

Board information

Board features

• Vin = +12 V, Vout = +1 V at 0 to 30 A
• Fs = 800 kHz/1000 kHz
• L= 150 nH (12.4 mm x 8.3 mm x 8 mm, DCR = 0.15 mΩ)
• Cin = 10 x 22 μF (25 V, ceramic 0805) + 1 x 330 μF (25 V, electrolytic, optional)
• Cout = 10 x 22 μF (6.3 V, ceramic 0805) + 4 x 47 μF (6.3 V, ceramic 0805) + 1 x 470 μF (2 V, 6 mΩ, SP-cap)

Connections and operating instructions

The IR3889 demo board requires a single +12 V for the input power and can deliver up to 30 A load current. The operation modes and OCP limits can be selected through jumpers.

Or, an external enable signal can be applied to this pin to over-drive the on- board enable signal

GND
Bode| A| For bode plot measurement
B
SS/Latch| OVP latch| Use a jumper to select one of four soft-start time selections (1 ms, 2 ms, 4 ms and 8 ms), and latched OVP or unlatched OVP
OVP no latch
Ton/Mode| FCCM| Use a jumper to select FCCM or DEM, and switching frequency. The available switching frequencies are 600 kHz, 800 kHz, 1000 kHz and 1200 kHz
DEM
ILIM|  | Use a jumper to select one of four OCP limits. OCP1 is the lowest OCP limit and OCP4 is the highest OCP limit
PGood| PGOOD| Connect a scope probe to this pin to monitor Power Good signal
GND| GND
 | EPGb| External PGood pull-up bias pin. PGood pin is pulled up to VCC through R4 on the standard demo board. By removing R4 and populating R42 with 49.9 kΩ, an external PGood pull-up bias can be applied to the EPGb pin
VCC| VCC| Standard demo board is configured to use the internal LDO. Connect a scope probe to this pin to monitor the output of the internal LDO
GND

Layout

The PCB is a six-layer board (3.0″ x 3.75″) using FR4 material. Top and bottom layers use 1.5 oz. copper and inner layers use 2 oz. copper. The PCB thickness is 0.062″. The IR3889 and other major power components are mounted on the top side of the board.

**PCB layout

**

WIRING

Bill of Materials (BOM)

Item| Qty| Reference| Value| Manufacturer| Part number| Description
---|---|---|---|---|---|---
1| 3| C2, C31, C32| 0.1 µF| Murata| GRM155R71E104KE14J| Ceramic capacitor 0.1 µF 25 V

10% X7R 0402

2| 3| C4, C11, C51| 4.7 µF| Murata| GRM188R61E475KE15D| Ceramic capacitor 4.7 µF 25 V

10% X5R 0603

3| 1| C5| 10 µF| Murata| GRT188R61C106KE13D| Ceramic capacitor 10 µF 16 V

±10% X5R 0603

4| 1| C6| 220 pF| Murata| GRM155R71H221KA01D| Ceramic capacitor 220 pF 50 V

10% X7R 0402

5| 2| C10, C50| 1000 pF| Murata| GRM155R61E102KA01D| Ceramic capacitor 1000 pF 25

V 10% X5R 0402

6| 10| C12, C13, C14, C15, C16, C17,| 22 µF| Murata| GRM21BR61E226ME44L| Ceramic capacitor 22 µF 25 V

20% X5R 0805

 |  | C18, C19, C20,|  |  |  |
 |  | C22|  |  |  |
7| 1| C21| 330 µF| Panasonic| EEV-FK1E331P| Aluminum capacitor 330 µF 20% 25 V SMD
8| 10| C25, C26, C27,| 22 µF| TDK| C2012X5R0J226M| Ceramic capacitor 22 µF 6.3 V
C30, C33, C34,

C35, C38, C40,

|  |  |  | X5R 0805
 |  | C41|  |  |  |
9| 4| C28, C29, C36, C37| 47 µF| TDK| C2012X5R0J476M125AC| Ceramic capacitor 47 µF 6.3 V

20% X5R 0805

10| 1| C45| 470 µF| Panasonic| EEF-SX0D471XE| Aluminum capacitor poly 470 µF 2 V 20% SMD
11| 1| L1| 150 nH| Delta| HCB138380D-151| Inductor 150 nH, Isat = 80 A 12.4 mm x 8.3 mm x 8 mm DCR =

0.15 mΩ SMD

12| 2| R1, R4| 49.9 k| Panasonic| ERJ-2RKF4992X| RES 49.9 kΩ 1/10 W 1% 0402 SMD
13| 1| R2| 7.5 k| Panasonic| ERJ-2RKF7501X| RES 7.50 kΩ 1/10 W 1% 0402 SMD
14| 1| R38| 21.5 k| Panasonic| ERJ-2RKF2152X| RES 21.5 kΩ 1/10 W 1% 0402 SMD
---|---|---|---|---|---|---
15| 5| R3, R5, R7, R20, R28| 0| Panasonic| ERJ-2GE0R00X| RES 0.0 Ω 1/10 W 0402 SMD
16| 2| R27, R35| 16.2 k| Panasonic| ERJ-2RKF1622X| RES 16.2 kΩ 1/10 W 1% 0402 SMD
17| 1| R9| 64.9 k| Panasonic| ERJ-2RKF6492X| RES SMD 64.9 kΩ 1% 1/10 W 0402
18| 2| R10, R37| 16.2 k| Panasonic| ERJ-2RKF1622X| RES 16.2 kΩ 1/10 W 1% 0402 SMD
19| 1| R11| 20| Vishay Dale| CRCW040220R0FKED| RES 20.0 Ω 1/16 W 1% 0402 SMD
20| 2| R21, R29| 1.5 k| Panasonic| ERJ-2GEJ152X| RES SMD 1.5 kΩ 5% 1/10 W 0402
21| 2| R22, R30| 2.49 k| Vishay Dale| CRCW04022K49FKED| RES 2.49 kΩ 1/16 W 1% 0402 SMD
22| 2| R23, R31| 3.48 k| Vishay Dale| CRCW04023K48FKED| RES 3.48 kΩ 1/16 W 1% 0402 SMD
23| 3| R24, R32, R36| 10.5 k| Panasonic| ERJ-2RKF1052X| RES 10.5 kΩ 1/10 W 1% 0402 SMD
24| 2| R25, R33| 12.1 k| Panasonic| ERJ-2RKF1212X| RES 12.1 kΩ 1/10 W 1% 0402 SMD
25| 2| R26, R34| 14 k| Panasonic| ERJ-2RKF1402X| RES 14.0 kΩ 1/10 W 1% 0402 SMD
26| 1| R39| 24.9 k| Panasonic| ERJ-2RKF2492X| RES 24.9 kΩ 1/10 W 1% 0402 SMD
27| 1| U1| IR3889| Infineon| IR3889| 30 A single-input voltage, synchronous buck regulator

Typical operating waveforms

Vin = 12.0 V, Vout = 1V, Iout = 0 to 30 A, room temperature, no air-flow

Revision history

Edition 2022-04-28 Published by Infineon Technologies AG 81726 Munich, Germany
© 2022 Infineon Technologies AG.
All Rights Reserved.
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IMPORTANT NOTICE

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• Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation warranties of non-infringement of intellectual property rights of any third party.
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• The data contained in this document is exclusively intended for technically trained staff. It is the responsibility of customer’s technical departmentsto evaluate the suitability of the product for the intended application and the completeness of the product information given in this document with respect to such application.
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• Except as otherwise explicitly approved by Infineon
• Technologies in a written document signed by authorized representatives of Infineon
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References

• Semiconductor & System Solutions - Infineon Technologies
• Semiconductor & System Solutions - Infineon Technologies

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