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Application Note
BCM43242
Power Supply Considerations
43242-AN400-R
5300 California Avenue • Irvine, CA 92617 • Phone: 949-926-5000 • Fax: 949-926-5203
December 18, 2013
Revision History
Revision
Date
Change Description
43242-AN400-R
12/18/2013
Initial release
Broadcom Corporation
5300 California Avenue
Irvine, CA 92617
© 2013 by Broadcom Corporation
All rights reserved
Printed in the U.S.A.
Broadcom®, the pulse logo, Connecting everything®, and the Connecting everything logo are among the
trademarks of Broadcom Corporation and/or its affiliates in the United States, certain other countries and/
or the EU. Any other trademarks or trade names mentioned are the property of their respective owners.
BCM43242 Application Note
Table of Contents
Table of Contents
About This Document.....................................................................................................................................6
Purpose and Audience .............................................................................................................................6
Acronyms and Abbreviations...................................................................................................................6
Technical Support...........................................................................................................................................6
USB Power Specifications............................................................................................................................... 7
Bluetooth Power Consumption Considerations ............................................................................................7
WLAN Power Consumption Considerations ..................................................................................................8
Remaining Budget....................................................................................................................................8
WLAN Maximum Current During Transmission ....................................................................................... 8
WLAN Maximum Current During Calibrations.......................................................................................10
Concerns .......................................................................................................................................................11
Considerations..............................................................................................................................................11
BROADCOM
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BCM43242 Application Note
List of Figures
List of Figures
Figure 1: Continuous DH5 TX..............................................................................................................................7
Figure 2: Peak Current at Packet Start ...............................................................................................................9
Figure 3: Calibration Duration for Both Cores (2G BW20) ...............................................................................10
Figure 4: Peak Current Duration.......................................................................................................................11
BROADCOM
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BCM43242 Application Note
List of Tables
List of Tables
Table 1: WLAN Maximum Current During Transmission....................................................................................8
Table 2: Maximum Current During Calibration ................................................................................................10
BROADCOM
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BCM43242 Application Note
About This Document
About This Document
Purpose and Audience
This document provides BCM43242 power consumption information for Bluetooth and WLAN during
transmission and calibration.
Acronyms and Abbreviations
In most cases, acronyms and abbreviations are defined on first use. For a comprehensive list of acronyms and
other terms used in Broadcom documents, go to http://www.broadcom.com/press/glossary.php.
Technical Support
Broadcom provides customer access to a wide range of information, including technical documentation,
schematic diagrams, product bill of materials, PCB layout information, and software updates through its
customer support portal (https://support.broadcom.com). For a CSP account, contact your Sales or Engineering
support representative.
In addition, Broadcom provides other product support through its Downloads and Support site at
(http://www.broadcom.com/support/).
BROADCOM
December 18, 2013 • 43242-AN400-R
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BCM43242 Application Note
USB Power Specifications
USB Power Specifications
Parameter
Value
Comment
USB power specifications (typical)
500 mA at 5V
This translates to 720 – 760 mA at 3.3V, given
95 – 100% regulator efficiency.
Bluetooth Power Consumption Considerations
Parameter
Value
Bluetooth power consumption (maximum)
Peak:
75 mA at 3.3V
Average:
70 mA at 3.3V
Comment
Bluetooth consumes the highest amount of
current when continuously transmitting DH5
packets (see Figure 1).
The plot shown in Figure 1 shows current consumption when DH5 packets are continuously transmitted.
Figure 1: Continuous DH5 TX
BROADCOM
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BCM43242 Application Note
WLAN Power Consumption Considerations
WLAN Power Consumption Considerations
Remaining Budget
Parameter
Value(s)
WLAN Remaining Budget:
645 – 685 mA at 3.3V
WLAN Maximum Current During Transmission
Table 1 lists WLAN maximum current during transmission.
Note: WLAN sinks the maximum current during transmission.
Table 1: WLAN Maximum Current During Transmission
Parameter
Tx Power on A0 Ptotal (dBm)
(dBm)
Icc_max at
Icc_steady
Packet Start (mA) (mA)
6.1
7.6
9.0
10.2
11.1
11.7
12.5
13.3
14.3
15.4
16.2
17.6
9.1
10.6
12.0
13.2
14.1
14.7
15.5
16.3
17.3
18.4
19.2
20.6
675
680
690
700
710
720
740
760
790
850
860
910
543
547
555
560
570
585
600
610
630
680
690
730
7.6
9.4
10.5
11.6
12.2
13.2
10.6
12.4
13.5
14.6
15.2
16.2
730
740
750
760
770
790
600
607
615
625
640
655
Channel 7 with 20 MHz Bandwidth
Channel 7 with 40 MHz Bandwidth
BROADCOM
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BCM43242 Application Note
WLAN Power Consumption Considerations
Table 1: WLAN Maximum Current During Transmission (Cont.)
Parameter
Tx Power on A0
(dBm)
14.2
15.3
16.2
17
Ptotal (dBm)
17.2
18.3
19.2
20
Icc_max at
Icc_steady
Packet Start (mA) (mA)
820
675
850
700
890
740
915
760
7.3
8.3
9.3
10.2
11.2
12.1
13
14
10.3
11.3
12.3
13.2
14.2
15.1
16
17
710
725
740
755
770
790
840
900
Channel 100 with 20 MHz Bandwidth
580
590
600
610
620
640
660
690
The plot shown in Figure 2 shows peak current at packet start. As the plot shows, the current settles within
100 μs.
Figure 2: Peak Current at Packet Start
BROADCOM
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BCM43242 Application Note
WLAN Power Consumption Considerations
WLAN Maximum Current During Calibrations
Table 2 lists WLAN maximum current during calibration.
Note: WLAN sinks the maximum current during calibration.
Table 2: Maximum Current During Calibration
Channel
Operating Mode
(bandwidth in MHz)
Icc_max (mA)
Icc_max duration (μs)
Icc_steady (at the end of
calibration)
7
7
100
20
40
20
830 – 870
890
860
135
100
135
530
530
530
Figure 3 shows current consumption over time during power amplifier pre-distortion (PAPD) calibration.
Figure 3: Calibration Duration for Both Cores (2G BW20)
BROADCOM
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BCM43242 Application Note
Concerns
The plot shown in Figure 4 shows a magnified view of peak current and duration.
Figure 4: Peak Current Duration
Concerns
Consider the following regarding the budget current allowed by USB:
• At certain WLAN output power levels, Icc_max and/or Icc_steady will exceed the budget current allowed
by USB.
• At the start of calibration, Icc_max is over the current budget allowed by USB.
Considerations
Consider the following in regards to USB current specifications:
• Consider using a USB supply that ca deliver up to 1000 mA
• If the peak value can be accepted (peak duration is less than 200 μs), then the WLAN output power can be
adjusted so that Icc_steady can meet USB current specifications.
BROADCOM
December 18, 2013 • 43242-AN400-R
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BCM43242 Application Note
Broadcom® Corporation reserves the right to make changes without further notice to any products
or data herein to improve reliability, function, or design.
Information furnished by Broadcom Corporation is believed to be accurate and reliable. However,
Broadcom Corporation does not assume any liability arising out of the application or use of this
information, nor the application or use of any product or circuit described herein, neither does it
convey any license under its patent rights nor the rights of others.
®
BROADCOM CORPORATION
5300 California Avenue
Irvine, CA 92617
© 2013 by BROADCOM CORPORATION. All rights reserved.
43242-AN400-R
December 18, 2013
Phone: 949-926-5000
Fax: 949-926-5203
E-mail: info@broadcom.com
Web: www.broadcom.com