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1/15 www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. single-chip type with built- in fet switching regulators simple step-down switching regulator with built-in power mosfet BD9329AEFJ description the BD9329AEFJ is a synchronous step-down switching regulato r that integrates 2 low resistance n-channel mosfets. it achieves 3a continuous output current over a wide input supply range. current mode operation provides fast transient response and easy phase compensation. features 1) wide operating input range 4.2v 18.0v 2) 3a output current 3) hi-side / lo-side fet on-resistance; 0.15 / 0.13 ? power switch 4) low esr output ceramic capacitors are available 5) low standby current during shutdown mode 6) 380 khz fixed operating frequency 7) feedback voltage 0.9v 1.5% accuracy at room temp. (2.0% guaranteed for -25 to 85 temperature range) 8) protection circuits under voltage lockout protection thermal shutdown over current protection 9) htsop-j8 package with exposed thermal pad. applications distributed power system pre-regulator for linear regulator absolute maximum ratings (ta = 25 ) parameter symbol ratings unit supply voltage vin 20 v switch voltage v sw 20 v power dissipation for htsop-j8 pd 3760 *1 mw package thermal resistance ja *2 ja 29.27 /w package thermal resistance jc *2 jc 3.75 /w operating temperature range topr -40 +85 storage temperature range tstg -55 +150 junction temperature tjmax 150 bst voltage v bst v sw +7 v en voltage v en 20 v all other pins v oth 20 v *1 derating in done 30.08 mw/ for operating above ta R 25 (mount on 4-layer 70.0mm 70.0mm 1.6mm board) *2 mount on 4-layer 50mm x 30mm x 1.6mm application board no.11027eat56
technical note 2/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. ? ?
technical note 3/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved.
technical note 4/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. ? ? ? ? ? ? ? ? ?
technical note 5/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved.
technical note 6/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. ? 50 55 60 65 70 75 80 85 90 95 0 500 1000 1500 2000 2500 3000 io[ma] efficiency[%] 1 10 100 1000 0.01 0.1 1 css [ uf] soft start time[ms]
technical note 7/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. fig.13 transient response (vin= 12v v out = 3.3v l= 10h cout =22f iout= 0.2-1.0a ) fig.17 start up waveform (vin= 12v v out = 3.3v l= 10h c ss = 0.1f) fig.15 transient response (vin= 12v v out = 3.3v l= 10h cout =22f iout= 0.2-3.0a) fig.16 output ripple voltage (vin= 12v v out = 3.3v l= 10h cout =22f i out=
technical note 8/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. ? ? ? ? ? ? ? ? ? ? ? ?
technical note 9/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. phase margin
technical note 10/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. (3) design of feedback resistance constant set the feedback resistance as shown below. fig.22 ? ren on/off signal en vin en 66 k ? ?
technical note 11/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. c in fet c out l v out vin ? ? ? ?
technical note 12/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. ? ? ? ? ? ?
technical note 13/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved.
technical note 14/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. 10) thermal shutdown circuit (tsd) this ic incorporates a built-in tsd circuit for the protecti on from thermal destruction. t he ic should be used within the specified power dissipation range. however, in the event that the ic continues to be oper ated in excess of its power dissipation limits, the attendant rise in the chip's junction temperature tj will trig ger the tsd circuit to turn off all outpu t power elements. operation of the tsd circuit presumes that the ic's absolute maximum ratings have been exceeded. application designs should never make use of the tsd circuit. 11) testing on application boards at the time of inspection of t he installation boards, when the capacitor is c onnected to the pin with low impedance, be sure to discharge electricity per process because it may load stresses to the ic. always turn the ic's power supply off before connecting it to or removing it from a jig or fixture during the inspection proce ss. ground the ic during assembly steps as an antistatic measure, and use similar cautio n when transporting or storing the ic. 12) en control speed chattering happens if standing lowering speed is slow when st anding of en pin is lowered. the reverse current in which the input side and the pressure operation are done from th e output side is generated when chattering operates with the output voltage remained, and there is a case to destruction. please set to stand within 100s when you control on/off by the en signal.
technical note 15/15 BD9329AEFJ www.rohm.com 2011.02 - rev. a ? 2011 rohm co., ltd. all rights reserved. (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. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin
r1120 a www.rohm.com ? 2011 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 specied herein is subject to change for improvement without notice. the content specied 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 specications, 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 specied 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 specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. 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 specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied 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, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re 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, aerospace 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 specied 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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