1/4 STRUCTURE Silicon Monolithic Integrated Circuit PRODUCT NAME 1ch DC／DC Converter Controller IC with Built-in Synchronous Rectifier TYPE BD9160FVM FEATURES ・Output Voltage：3.3V, Output Current：0.6A ・High Efficiency and Fast Transient Response ○ABSOLUTE MAXIMUM RATING（Ta=25℃） Parameter Symbol Limit VCC -0.3～+7 * 1 PVCC -0.3～+7 * 1 EN -0.3～+7 V SW・ITH Voltage SW, ITH -0.3～+7 V SW Output Current ISW 1.1 * Power Dissipation 1 Pd1 387.5 * 2 mW Power Dissipation 2 Pd2 587.4 * 3 mW Operating Temperature Range Topr -25～+85 ℃ Storage Temperature Range Tstg -55～+150 ℃ Tjmax +150 ℃ Vcc Voltage PVcc Voltage EN Voltage Maximum Junction Temperature Unit V V 1 A 1 * Pd, ASO, and Tjmax=150℃ should not be exceeded. 2 * Derating is 3.1mW /℃ for temperatures above Ta=25℃. 3 * Derating is 4.7mW /℃ for temperatures above Ta=25℃ (when mounted on 70mm×70mm×1.6mm glass epoxy PCB). ○OPERATING CONDITIONS（Ta=-25～+85℃） Symbol Min. Typ. Max. VCC 4.5 5.0 5.5 V PVCC 4.5 5.0 5.5 V EN Voltage EN 0 - VCC SW Average Output Current ISW - - 0.6* Parameter Vcc Voltage PVcc Voltage 4 * Pd and ASO should not be exceeded. REV.A 4 Unit V A 2/4 ○ ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Ta=25℃ VCC=PVCC=5V, EN=Vcc） Parameter Standby Current Symbol Limit Unit Min. Typ. Max. ISTB - 0 10 μA Condition EN=GND ICC - 250 400 μA EN Low Voltage VENL - GND 0.8 V Stand-by Mode EN High Voltage VENH 2.0 Vcc - V Active Mode IEN - 1 10 μA FOSC 0.8 1 1.2 MHz Bias Current EN Input Current Oscillation Frequency VEN=5V Pch FET ON Resistance RONP - 0.44 0.74 Ω PVCC=5V Nch FET ON Resistance RONN - 0.33 0.53 Ω PVCC=5V Output Voltage VOUT 3.234 3.300 3.366 V ITH SINK Current ITHSI 10 20 - μA VOUT =3.88V ITHSO 10 20 - μA VOUT =2.72V UVLO Threshold Voltage VUVLO1 3.6 3.8 4.0 V VCC=5V→0V UVLO Release Voltage VUVLO2 3.65 3.9 4.2 V VCC=0V→5V TSS 0.5 1 2 ms TLATCH 1 2 3 ms VSCP 1.5 2 2.7 V ITH Source Current Soft Start Time Timer Latch Time Output Short circuit Threshold Voltage ○PHYSICAL DIMENSION SCP/TSD Operational Mode VOUT=3.3V→0V ○BLOCK DIAGRAM・APPLICATION CIRCUIT VCC EN 3 VCC 8 VREF PVCC D 9 1 6 0 5V Input 7 10μF Current Comp Lot No. + R Q S 1PIN MARK Gm Amp SLOPE CLK OSC + VCC Current Sense/ Protect + 6 Driver Logic 4.7μH SW 10μF UVLO Soft Start TSD SCP 5 PGND 4 GND 1 MSOP8 (Unit:mm) ○PIN No.・ PIN NAME PIN No. PIN Name 1 VOUT 2 ITH 3 EN 4 GND 5 PGND 6 SW 7 PVCC 8 VCC REV. A VOUT 2 ITH 30kΩ 330pF Output 3/4 ○NOTES FOR USE (1) Absolute maximum rating Although the quality of this IC is rigorously controlled and will function properly in normal operating conditions, the IC may be destroyed when applied voltage or operating temperature exceeds its absolute maximum rating. Because short mode or open mode cannot be specified when the IC is destroyed, it is important to take physical safety measures such as fusing if a special mode in excess of absolute rating limits is to be implemented. (2) GND potential Make sure the potential for the GND pin is always kept at the minimum, regardless of the operating mode. In addition, verify that the GND voltage is lower than the potential of all terminals except SW, PGND and GND in all conditions, including electric transient events. (3) Thermal design Do not exceed the power dissipation (Pd) of the package specification rating under actual operation. Provide sufficient margin in the thermal design to account for the Pd expected in actual use. (4) Short-circuits between pins and incorrect mounting position When mounting the IC onto the set PCB, be extremely careful about the orientation and position of the IC. The IC may be destroyed if it is incorrectly positioned for mounting. Do not short-circuit between pins, or between a pin and the power supply or ground terminal. Note that introducing foreign matter in these paths will cause shorts and may damage the IC. (5) Operation in strong electromagnetic fields Use in strong electromagnetic fields may cause malfunctions. Use extreme caution with electromagnetic fields. (6) ASO (Area of Safe Operation) Do not exceed the maximum ASO parameter or the absolute maximum ratings of the output driver. (7) TSD (Thermal Shutdown) circuit This product is provided with a built-in thermal shutdown (TSD) circuit, which is activated when the IC chip temperature rises to the threshold value. In this case, TSD automatically latches output OFF. Output is restored when the EN block is activated again, or when UVLO is deactivated. Note that the TSD circuit is provided for the exclusive purpose shutting down the IC in the presence of extreme heat, and is not designed to protect the IC per se or guarantee performance when or after extreme heat conditions occur. Therefore, do not operate the IC with the expectation of continued use or subsequent operation once the TSD is activated. (8) GND wiring pattern When both a small-signal GND and high current GND are present, single-point grounding (at the standard point on the circuit set board) is recommended. This will separate the small-signal and high current patterns, and serves to ensure that the high current flow and wire impedance will not change the small-signal GND voltage. In the same way, care must be taken to avoid wiring pattern fluctuations in any connected external component GND. (9) Operation in supply voltage range Circuit functionality is guaranteed within the operating ambient temperature, as long as the operation is within the supply voltage range. The standard electrical characteristics cannot be guaranteed. However, any variation in these values will be small, as long as the operation is within the supply voltage range. (10) The application schematic presented above is an example of recommended circuit layout. Although the circuit example is sound, actual circuit characteristics should be checked carefully before use. Be sure to allow sufficient margins to accommodate variations between external devices and this IC when employing the depicted circuit with other circuit constants modified. Both static and transient characteristics should be considered in establishing these margins. When switching noise is substantial and may impact the system, a low pass filter should be inserted between the Vcc and PVcc pins, and a Schottky barrier diode established between the SW and PGND pins. REV. A 4/4 (11) Overcurrent protection circuit/Output short protection circuit The overcurrent protection circuit is built into output, and functions as the current limit. Note that if the protection circuit operates more than a specified time period (when the output short-circuit protection circuit detects a load short or other similar state) the output will be latched OFF. Output is restored when the EN block is activated again, or when UVLO is deactivated. Although the protection circuits effectively prevent IC destruction under fault conditions, they should not be employed continuously. (12) Selection of inductor Please use an inductor with a series resistance element (DCR) under 0.2Ω. Note that use of a high DCR inductor will cause an inductor loss, resulting in decreased voltage output. Should this condition continue for a specified period (soft start time + timer latch time), output short circuit protection will be activated and output will be latched OFF. When using an inductor over 0.2Ω, be careful to ensure adequate margins for variation between eternal devices and this IC, including transient as well as static characteristics. REV. A Notice 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, communication 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, redundancy, 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, 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 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. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. R0039A