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| 1/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. single-chip type with built-in fet switching regulators low noise high-efficiency switching regulator with built-in power mosfet BD8963EFJ description rohm?s high efficiency step-down switching regulator BD8963EFJ is a power supply designed to produce a low voltage including 1 volts from 5.5/3.3 volts power supply line. offers high efficiency with synchronous rectifier. employs a current mode control system to provide faster tr ansient response to sudden change in load. features 1) offers fast transient response with current mode pwm control system. 2) offers highly efficiency for all load range with synchronous rectifier (nch/pch fet) 3) incorporates soft-start function. 4) incorporates thermal protection and ulvo functions. 5) incorporates short-current protec tion circuit with time delay function. 6) incorporates shutdown function 7) employs small surface mount package : htsop-j8 applications power supply for lsi including dsp, micro computer and asic absolute maximum ratings parameter symbol ratings unit v cc voltage v cc -0.3 ~ +7 *1 v en voltage v en -0.3 ~ +7 v sw,comp voltage v sw ,v comp -0.3 ~ +7 v power dissipation 1 pd1 0.5 *2 w power dissipation 2 pd2 3.76 *3 w operating temperature range topr -25 ~ +85 storage temperature range tstg -55 ~ +150 maximum junction temperature tjmax +150 *1 pd should not be exceeded. *2 reduced by 4.0mw for increase in ta of 1 above 25 . *3 reduced by 30.0mw for increase in ta of 1 above 25 . (when mounted on a board 70.0mm 70.0mm 1.6mm glass-epoxy pcb) operating conditions (ta=-25 ~ +85 ) parameter symbol ratings unit min. typ. max. power supply voltage v cc 2.7 *5 5.0 5.5 v en voltage v en 0 - vcc v output voltage range v out 1.0 - 2.5 *4 v sw average output current isw - - 3.0 *5 a *4 in case set output voltage 1.6v or more, vccmin. = vout +2.25v *5 pd should not be exceeded. no.10027eat43
technical note 2/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ ? 8765 1234 0.42 +0.05 -0.04 s (2.4) 4.90.1 6.00.2 3.90.1 0.080.05 0.850.05 1.0max. 0.545 1.27 0.17 +0.05 -0.03 max5.25(include.burr) (3.2) 0.08 s 1.050.2 0.650.15 0.08 m 4 +6 -4 lot no. bd8963 fig.1 BD8963EFJ top view fig.2 BD8963EFJ block diagram tsd output input v cc sw gm amp r s q osc uvlo + v cc clk slope current comp 4 5 2 soft start current sense/ protect + driver logic + vref comp adj 1 8 scp 6 3 v cc en gnd technical note 3/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ technical note 4/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ 0.8 0.9 1 1.1 1.2 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 input voltage:v cc [v] frequency:f osc [mhz] fi g .13 soft start waveform fi g .14 sw waveform io=10ma fig. 15 transient response io=0.5a technical note 5/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ ? ? ? technical note 6/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ ? technical note 7/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ ? ? ? ? technical note 8/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ ? technical note 9/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ 0 1 2 3 4 0 25 50 75 100 125 150 ambient temperature:ta [] power dissipation:pd [w] technical note 10/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ ??? ??? ??? ??? ??? technical note 11/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ 4. determination of rcomp, ccomp that works as a phase compensator as the current mode control is designed to limit a inductor current, a pole (phase lag) appears in the low frequency area due to a cr filter consisting of a output capacitor and a load resistance, while a zero (phase lead) appears in the high frequency area due to the output capacitor and its esr. so, the phases are easily compensated by adding a zero to the power amplifier output with c and r as described bel ow to cancel a pole at the power amplifier. stable feedback loop may be achieved by canceling the pol e fp (min.) produced by the output capacitor and the load resistance with cr zero correction by the error amplifier. fig.28 open loop gain characteristics fig.29 error amp phase compensation characteristics gnd sw v cc en a dj comp v cc v out cin r comp c comp l esr c o r o v out fig.30 typical application fz (amp.) = fp (min.) 2 technical note 12/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ 5. determination of output voltage the output voltage v out is determined by the equation (6): v out =(r2/r1+1) ??? ? ? ? technical note 13/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ technical note 14/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ top laye r middle laye r bottom layer fig.34 reference pcb layout pattern top silkscreen overlay bottom silkscreen overlay technical note 15/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ ? ? ? ? technical note 16/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ technical note 17/17 www.rohm.com 2010.06 - rev. a ? 2010 rohm co., ltd. all rights reserved. BD8963EFJ (unit : mm) htsop-j8 0.08 s 0.08 m s 1.0max 0.850.05 1.27 0.080.08 0.42 +0.05 - 0.04 1.050.2 0.650.15 4 + 6 ? 4 0.17 +0.05 - 0.03 234 568 (max 5.25 include burr) 7 1 0.545 (3.2) 4.90.1 6.00.2 (2.4) 3.90.1 1pin mark order quantity needs to be multiple of the minimum quantity. r1010 a www.rohm.com ? 2010 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the products. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redunda ncy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospac e machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law. |
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