Datasheet 2.7V to 5.5V, 2.0A 1ch Synchronous Buck Converter with Integrated FET BD9130NV General Description Key Specifications BD9130NV is ROHM’s high efficiency step-down switching regulator designed to provide a voltage as low as 1V from a supply voltage of 5.5V/3.3V. It offers high efficiency by using pulse skip control technology and synchronous switches, and provides fast transient response to sudden load changes by implementing current mode control.
BD9130NV Pin Configuration (TOP VIEW) ADJ 1 8 EN VCC 2 7 PVCC ITH 3 6 SW GND 4 5 PGND Figure 2. Pin Configuration Pin Description Pin No. Pin name 1 2 3 4 5 6 7 8 ADJ VCC ITH GND PGND SW PVCC EN Pin function Output voltage detection pin Power supply input pin GmAmp output pin/connected to phase compensation capacitor Ground pin Power switch ground pin Power switch node Power switch supply pin Enable pin (Active high) Block Diagram VCC PVCC VCC RITH R1 CITH R2 Figure 3.
BD9130NV Absolute Maximum Ratings Parameter VCC Voltage Symbol Limit V PVCC -0.3 to +7 (Note 1) V VEN -0.3 to +7 V VCC PVCC Voltage EN Voltage SW,ITH Voltage Unit (Note 1) -0.3 to +7 VSW,VITH -0.3 to +7 V Power Dissipation 1 Pd1 0.90(Note 2) W Power Dissipation 2 Pd2 3.90(Note 3) W Operating Temperature Range Topr -25 to +105 °C Storage Temperature Range Tstg -55 to +150 °C Tjmax +150 °C Maximum Junction Temperature (Note 1) Pd should not be exceeded.
BD9130NV [VOUT=2.5V] Ta=25°C Ta=25°C IO=0A IO=0A [VOUT=1.8V] [VOUT=1.8V] Output Voltage: VOUT [V] Output Voltage: VOUT [V] Typical Performance Curves VCC=3.3V Ta=25°C IO=0A Ta=25°C IO=0A EN Voltage: VEN [V] Input Voltage: VCC [V] Figure 4. Output Voltage vs Input Voltage Figure 5. Output Voltage vs EN Voltage VCC=3.3V IO=0A [VOUT=2.5V] VCC=5V Ta=25°C [VOUT=1.8] VCC=3.3V Ta=25°C Output Voltage: VOUT [V] Output Voltage: VOUT [V] [VOUT=1.
BD9130NV Typical Performance Curves - continued Efficiency: η [%] [VOUT=1.8V] VCC=3.3V Ta=25°C [VOUT=2.5V] VCC=5V Ta=25°C Frequency: fOSC [MHz] VCC=3.3V Temperature: Ta [°C] Output Current: IOUT [mA] Figure 9. Frequency vs Temperature Figure 8. Efficiency vs Output Current VCC=3.3V EN Voltage: VEN [V] ON-Resistance: RON [Ω] VCC=3.3V Temperature: Ta [°C] Temperature: Ta [°C] Figure 11. EN Voltage vs Temperature Figure 10. ON-Resistance vs Temperature www.rohm.com © 2012 ROHM Co., Ltd.
BD9130NV Typical Performance Curves - continued VCC=3.3V Frequency: fOSC [MHz] Circuit Current: ICC [µA] Ta=25°C Temperature: Ta [°C] Input Voltage: VCC [V] Figure 12. Circuit Current vs Temperature Figure 13. Frequency vs Input Voltage Typical Waveforms [VOUT=1.8V] VCC=PVCC =EN [SLLMTM control VOUT=1.8V] SW VOUT VOUT VCC=3.3V Ta=25°C IO=0A VCC=3.3V Ta=25°C Figure 14. Soft Start Waveform www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Figure 15.
BD9130NV Typical Waveforms - continued [PWM control [VOUT=1.8V] VOUT=1.8V] VOUT VCC=3.3V Ta=25°C IOUT VCC=3.3V Ta=25°C Figure 17. Transient Response (Io=1A to 2A, 10μs) Figure 16. SW Waveform (Io=200mA) [VOUT=1.8V] VOUT IOUT VCC=3.3V Ta=25°C Figure 18. Transient Response (Io=2A to 1A,10μs) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 7/21 TSZ02201-0J3J0AJ00130-1-2 02.Oct.2014 Rev.
BD9130NV Application Information 1. Operation BD9130NV is a synchronous step-down switching regulator that achieves fast transient response by employing current mode PWM control system. It utilizes switching operation either in PWM (Pulse Width Modulation) mode for heavier load, or SLLMTM (Simple Light Load Mode) operation for lighter load to improve efficiency.
BD9130NV 2. Description of Functions (1) Soft-Start Function During start-up, the soft-start circuit gradually establishes the output voltage to limit the input current. This prevents the overshoot in the output voltage and inrush current. (2) Shutdown Function When EN terminal is “Low”, the device operate in Standby Mode, and all the functional blocks such as reference voltage circuit, internal oscillator and drivers are turned OFF. Standby current is 0μA (Typ).
BD9130NV 3. Information on Advantages Advantage 1：Offers fast transient response by using current mode control system Conventional product (Load response IO=0.1A to 0.6A) BD9139NV (Load response IO=1A to 2A) VOUT VOUT 29mV 110mV IOUT IOUT Voltage drop due to sudden change in load was reduced. Figure 24.
BD9130NV 4. Switching Regulator Efficiency Efficiency η may be expressed by the equation shown below: VOUT IOUT VIN I IN 100 POUT POUT 100 100 PIN POUT Pd % Efficiency may be improved by reducing the switching regulator power dissipation factors Pdα as follows: Dissipation factors: (1) ON-Resistance Dissipation of Inductor and FET: Pd(I2R) Pd I 2 R I OUT 2 RCOIL RON where: RCOIL is the DC resistance of inductor. RON is the ON-Resistance of FET.
BD9130NV 5. Consideration on Permissible Dissipation and Heat Generation Since this IC functions with high efficiency without significant heat generation in most applications, no special consideration is needed on permissible dissipation or heat generation. In case of extreme conditions, however, including lower input voltage, higher output voltage, heavier load, and/or higher temperature, the permissible dissipation and/or heat generation must be carefully considered.
BD9130NV 6. Selection of Components Externally Connected (1) Selection of Inductor (L) The inductance significantly depends on the output ripple current. As seen in equation (1), the ripple current decreases as the inductor and/or switching frequency increases. IL ΔIL IL VCC VCC VOUT VOUT A L VCC f ・・・(1) Appropriate output ripple current should be ±20% of the maximum output current. IL VOUT A I L 0.
BD9130NV (4) Calculating RITH, CITH for Phase Compensation Since the Current Mode Control is designed to limit an inductor current, a pole (phase lag) appears in the low frequency area due to a CR filter consisting of an 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.
BD9130NV (5) Setting the Output Voltage The output voltage VOUT is determined by the equation (6): VOUT ( R2 / R1 1) V ADJ L ・・・(6) 6 Output SW Where: VADJ is the Voltage at ADJ terminal (0.8V Typ) Co R2 1 ADJ R1 The required output voltage may be determined by adjusting R1 and R2. Figure 34. Setting the Output Voltage Adjustable output voltage range : 1.0V to 2.5V Use 1 kΩ to 100 kΩ resistor for R1.
BD9130NV 8. Recommended Components Lists on Above Application Symbol Part Value Manufacturer Series Coil 2.2µH TDK LTF5022-2R2N3R2 CIN Ceramic capacitor 22µF Kyocera CM32X5R226M10A CO Ceramic capacitor 22µF Kyocera CM316B226M06A Murata Murata Murata Murata Murata Rohm Rohm Rohm Rohm Rohm GRM18 Series GRM18 Series GRM18 Series GRM18 Series GRM18 Series MCR03 Series MCR03 Series MCR03 Series MCR03 Series MCR03 Series L CITH Ceramic capacitor RITH Resistance VOUT=1.0V VOUT=1.2V VOUT=1.
BD9130NV Operational Notes 1. Reverse Connection of Power Supply Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when connecting the power supply, such as mounting an external diode between the power supply and the IC’s power supply pins. 2. Power Supply Lines Design the PCB layout pattern to provide low impedance supply lines.
BD9130NV Operational Notes – continued 11. Unused Input Pins Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small charge acquired in this way is enough to produce a significant effect on the conduction through the transistor and cause unexpected operation of the IC.
BD9130NV Ordering Information B D 9 1 3 0 Part Number N V - Package NV:SON008V5060 E2 Packaging and forming specification E2: Embossed tape and reel Marking Diagram SON008V5060 (TOP VIEW) Part Number Marking BD9130 LOT Number 1PIN MARK www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 19/21 TSZ02201-0J3J0AJ00130-1-2 02.Oct.2014 Rev.
BD9130NV Physical Dimension, Tape and Reel Information Package Name www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 SON008V5060 20/21 TSZ02201-0J3J0AJ00130-1-2 02.Oct.2014 Rev.
BD9130NV Revision History Date Revision 02.Mar.2012 02.Oct.2014 001 002 Changes New Release Applied the ROHM Standard Style and improved understandability. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 21/21 TSZ02201-0J3J0AJ00130-1-2 02.Oct.2014 Rev.
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