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STRUCTURE PRODUCT NAME TYPE FEATURES
Silicon Monolithic Integrated Circuit 1ch DCDC Converter IC built in synchronous rectifier
BD9123MUV
Output Voltage3 bit Adjustable Setting (0.85~1.2V) Output Current1.2A High Efficiency and Fast Transient Response
ABSOLUTE MAXIMUM RATING (Ta=25)
Parameter Power Supply Voltage EN, SW, ITH Voltage Logic Input Voltage Power Dissipation 1 Power Dissipation 2 Power Dissipation 3 Power Dissipation 4 Operating Temperature Range Storage Temperature Range Maximum Junction Temperature
1
Symbol VCC PVCC EN, SW, ITH VID<2:0> Pd1 Pd2 Pd3 Pd4 Topr Tstg Tjmax
Limit -0.3+7 * -0.3+7 * -0.3+7 -0.3+7 0.27 * 0.62 * 1.77 * 2.66 *
2 3 4 5 1 1
Unit V V V V W W W W
-40+95 -55+150 +150
* Pd, ASO, and Tjmax=150 should not be exceeded. 2 * IC only. 3 2 * 1 layer, mounted on a board 74.2mmx74.2mmx1.6mm Glass-epoxy PCB (Copper foil area : 6.28mm ) 4 2 * 4 layers, mounted on a board 74.2mmx74.2mmx1.6mm Glass-epoxy PCB (Copper foil area in 1,4layer : 6.28mm , 2 Copper foil area in 2,3layer : 5505 mm ) 5 2 * 4 layers, mounted on a board 74.2mmx74.2mmx1.6mm Glass-epoxy PCB (Copper foil area : 5505mm ) , copper foil in each layers.
OPERATING CONDITIONS (Ta=-40+95)
Parameter Vcc Voltage PVcc Voltage EN Voltage Logic Input Voltage Output Voltage range SW Average Output Current * Pd and ASO should not be exceeded. This product is not designed for protection against radioactive rays. Status of this document The Japanese version of this document is the formal specification. A customer may use this translation version only for a reference to help reading the formal version. If there are any differences in translation version of this document, formal version takes priority.
6
Symbol VCC PVCC EN VID<2:0> VOUT ISW
Min. 2.7 2.7 0 0 0.85 -
Typ. 3.3 3.3 -
Max. 5.5 5.5 VCC 5.5 1.2 1.2*
6
Unit V V V V V A
REV. B
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ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Ta=25, VCC=PVCC=5V, EN=VCC, VID<2>=VID<1>=VID<0>= 0V)
Parameter Standby Current Bias Current EN Low Voltage EN High Voltage EN Input Current VID Low Voltage VID High Voltage VID Input Current Oscillation Frequency Pch FET ON Resistance Nch FET ON Resistance Output Voltage ITH SINK Current ITH Source Current UVLO Threshold Voltage UVLO Release Voltage Power Good Threshold Power Good Release Power Good Delay Power Good ON Resistance Soft Start Time Timer Latch Time Output Short Circuit Threshold Voltage Symbol ISTB ICC VENL VENH IEN VVIDL VVIDH IVID FOSC RONP RONN VOUT ITHSI ITHSO VUVLO1 VUVLO2 VPGOOD1 VPGOOD2 TPG RONPG TSS TLATCH VSCP Min. 2.0 2.0 0.8 0.98 25 25 2.4 2.425 70 85 2.5 0.4 1 Limit Typ. 0 300 GND Vcc 5 GND Vcc 5 1 0.35 0.25 1.0 50 50 2.5 2.55 75 90 5 140 0.8 2 Max. 10 500 0.8 10 0.8 10 1.2 0.60 0.50 1.02 2.6 2.7 80 95 10 280 1.6 4 Unit A A V V A V V A MHz V A A V V % % ms ms ms V VOUT0V PVcc=5V PVcc=5V VID<2:0>=(0,0,0) setting VOUT=1.2V VOUT=0.8V Vcc=5V0V Vcc=0V5V VOUT0V 0VVOUT VVID=5V Standby mode Active mode VEN=5V EN=GND Condition
VOUTx0.5 VOUTx0.7
PHYSICAL DIMENSION
3.0 0.1
BLOCK DIAGRAMAPPLICATION CIRCUIT
VCC EN
13
3.0 0.1
D
91
Vcc 0.1F VREF Current Comp SELECTOR + SLOPE OSC VCC Soft Start 7 PGOOD PGOOD UVLO TSD RQ S CLK
14
23
100
15 16
Lot No.
1PIN MARK
1.0MAX
VID<0> 12 VID<1> 11 VID<2> 10 Gm Amp + VOUT VCC 9
Input 10F PVCC
Current Sense/ Protect + Driver Logic
S
0.02 + 0.03 - 0.02 (0.22)
1 2 3
SW 4.7H Output
0.08 S
PGND 4 5 6 GND
10F
C0.2
1.4 0.1 0.5 1 4
1.4 0.1
0.4 0.1
16
5
13 12 9
8
0.75
0.25
+ 0.05 - 0.04
8
ITH RITH
VQFN016V3030 (Unit:mm)
CITH
REV. B
3/4 Pin Layout Pin No. 1 2 3 4 5 6 7 8
PVCC
Pin name SW PGND GND PGOOD ITH VOUT VID<2> VID<1> VID<0> EN VCC PVCC
Function Pch/Nch FET Drain Output Pin Nch FET Source Pin GND pin Power Good Pin Gm Amp output/ Phase compensation filter connected pin Output Voltage Setting Pin Output Voltage Setting Pin <2> Output Voltage Setting Pin <1> Output Voltage Setting Pin <0> Enable Pin (High active) Vcc Power Supply Input Pin Pch FET Source Pin
VID<0> VID<1> VID<2> VOUT
12 13 14 15 16 1
SW
11
10
9 8 7 6 5
ITH
EN
VCC
PGOOD
GND
PVCC
PGND
2
SW
3
SW
4
PGND
9 10 11 12 13 14 15 16
Top View
Output Voltage Setting Table VID<2> VID<1> VID<0> VOUT 0 0 0 1.0V 0 0 1 0.85V 0 1 0 0.9V 0 1 1 0.95V 1 0 0 1.05V 1 0 1 1.1V 1 1 0 1.15V 1 1 1 1.2V *VOUT change starts after 10s pass from the bit change. *The time of 1step for VOUT (50mV shift) takes 5s (max). *The time that output voltage reaches the setting value, tVID (max) is 0.06ms.
REV. B
4/4 NOTES FOR USE (1) Absolute Maximum Ratings We are careful enough for quality control about this IC. So, there is no problem under normal operation, excluding that it exceeds the absolute maximum ratings. However, this IC might be destroyed when the absolute maximum ratings, such as impressed voltages or the operating temperature range, is exceeded, and whether the destruction is short circuit mode or open circuit mode cannot be specified. Pleases take into consideration the physical countermeasures for safety, such as fusing, if a particular mode that exceeds the absolute maximum rating is assumed. (2) GND Potential Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state. Furthermore, check to be sure no terminals are at a potential lower than the GND voltage except for SW, PGND, GND terminals including an actual electric transient. (3) Thermal design Do not exceed the power dissipation (Pd) of the package specification rating under actual operation, and please design enough temperature margins. (4) Short circuit mode between terminals and wrong mounting In order to mount the IC on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can destroy the IC. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the GND terminal, the IC can destroy (5) Operation in Strong electromagnetic field Be noted that using the IC in the strong electromagnetic radiation can cause operation failures. (6) ASO (Area of Safety Operation.) Do not exceed the maximum ASO and the absolute maximum ratings of the output driver. (7) TSD (Thermal Shut-Down) circuit The thermal shutdown circuit (TSD circuit) is built in this product. When IC chip temperature becomes higher, the thermal shutdown circuit operates and turns output off. The guarantee and protection of IC are not purpose. Therefore, please do not use this IC after TSD circuit operates, nor use it for assumption that operates the TSD circuit. (8) GND wiring pattern Use separate ground lines for control signals and high current power driver outputs. Because these high current outputs that flows to the wire impedance changes the GND voltage for control signal. Therefore, each ground terminal of IC must be connected at the one point on the set circuit board. As for GND of external parts, it is similar to the above-mentioned. (9) Operation in supply voltage range Functional Circuit operation is guaranteed within operation ambient temperature, as long as it is within operation supply voltage range. The electrical characteristics standard value cannot be guaranteed. However, there is no drastic variation in these values, as long as it is within operation supply voltage range. (10) We are confident in recommending the above application circuit example, but we ask that you carefully check the characteristics of this circuit before using it. If using this circuit after modifying other external circuit constants, be careful to ensure adequate margins for variation between external devices and this IC, including not only static characteristics but also transient characteristics. If switching noise is high, please insert the schottky barrier diodes between SW pin and PGND pin. (11) Overcurrent protection circuit The overcurrent protection circuit is built in the output. If the protection circuit operates more than for specific hours (when the load is short.), the output will be latched in OFF. The output returns when EN is turned on or UVLO is released again. These protection circuits are effective in the destruction prevention by broken accident. Please do not use in continuous circuit operation. (12) Selection of inductor It is recommended to use an inductor with a series resistance element (DCR) 0.15 or less. Note that use of a high DCR inductor will cause an inductor loss, resulting in decreased output voltage. 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 0.15, be careful to ensure adequate margins for variation between external devices and this IC, including transient as well as static characteristics.
REV. B
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.
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