BD95710MUV ROHM Electronics, BD95710MUV Datasheet
BD95710MUV
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BD95710MUV Summary of contents
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... Controllers for Graphic Card BD95710MUV ●Description BD95710MUV is a dual-phase switching regulator controller with high output current which can achieve low output voltage (0.4V ~ 3.3V) from AC/ 12V. High efficiency for the switching regulator can be realized by utilizing an external N-MOSFET power transistor. A new technology called H load change without phase compensation capacitance and resistance ...
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... BD95710MUV ●ELECTRICAL CHARACTERISTICS (Unless otherwise noted, Ta=25℃, VCC=5V, VIN=12V, REF=1.2V, RT=100kΩ) Parameter [Total Block] Vcc Bias Current Vcc Standby Current [5Vcc Block] 5Vcc Output Voltage 5Vcc Output Current [UVLO Block] VCC Threshold Voltage VCC Hysteresis Voltage BUS EN Threshold Voltage BUS EN Hysteresis Voltage ...
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... BD95710MUV ●Block Diagram VIN=12V BUSEN 5 VCCDRV 21 VCC 22 5VCC 3 REFIN/EN 0.6V 15 AGND IMAX/IOUT 10 PGND IREFOUT /POK 16 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. OFF 8VReg Controller BG 3ms 5VReg Soft Start Reg Vo Comp Controller 4.5V CSP1 CS1- Current Sense OCP CSP2 ...
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... BD95710MUV ●Pin Configuration 19 PHASE2 20 LGATE2 21 VCCDRV 22 VCC 23 1 LGATE 24 E PHAS ●Pin Function Table PIN No. PIN Name 1 UGATE1 2 BOOT1 3 5VCC 4 AGND 5 BUSEN 6 CSP1 7 CSN1 8 CSN2 9 CSP2 10 IMAX / IOUT AGND PGND 15 REFIN/EN 16 INREFOUT/ POK 17 BOOT2 18 UGATE2 19 PHASE2 20 LGATE2 21 VCCDRV 22 VCC ...
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... This pin has multiple functions such as the output current indication, OCP (Over Current Protection) limit setting, and the output voltage load line adjustment pin. BD95710MUV detects the voltage between Cs+ pin and Cs- pin and limits the output current (OCP) using resistance connected between IMAX/IOUT/Droop and GND. A very low current sense resistor or inductor DCR can also be used for this platform. ・ ...
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... BD95710MUV ●Explanation of Operation The BD95710MUV is a synchronous buck regulator controller incorporating ROHM’s proprietary H control system. When V drops due to a rapid load change, the system quickly restores V OUT interval. Thus, it serves to improve the regulator’s transient response Reg control (Normal operation) ...
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... BD95710MUV ●Timing Chart ・Soft Start Function REFIN/ VOUT IIN ・Output Over Voltage Protection switching ・Short Circuit Protection with Timer Latch REFIN/EN x 0.5 FB TSCP SCP REFIN/EN or UVLO www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Soft start is activated when REFIN/EN hits its enabling threshold (VCC, 5VCC, and BUSEN have to be beyond their own UVLO thresholds) ...
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... BD95710MUV ●External Component Selection 1. Inductor (L) selection ΔIL VIN IL VOUT L Co Output Ripple Current ※Passing a current larger than the inductor’s rated current will cause magnetic saturation in the inductor and decrease system efficiency. In selecting the inductor, be sure to allow enough margin to assure that peak current does not exceed the inductor rated current value. ※ ...
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... BD95710MUV 4.MOSFET Selection 5. OCP Setting Resistance VIN_BUS CSP1 CS1- OCP CSP2 CSN2 V IMAX IMAX PIN I IMAX R IMAX www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Pmain RON GATE Loss on the main MOSFET = VOUT OUT 4 x VIN (Ron: On-resistance of FET ...
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... BD95710MUV 6. Setting output voltage The output voltage is REFIN/EN = VOUT when VOUT is tied to the FB directly. The range of VOUT is 0.4V ~ 3.3V. BUSEN 3 H Reg CONTROLLA REFIN/EN FB The output voltage is calculated as follow when resistor divider network is connected between the FB and VOUT. REFIN/EN set 5Vcc. BUSEN 3 H Reg CONTROLLA 0 ...
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... BD95710MUV 8. UVLO BD95710MUV has function to detect input UVLO voltage in each VCC, 5VCC, and BUSEN for output voltage to start up. If all these inputs go beyond their own UVLO threshold voltage, the soft start function kicks in. These threshold voltages have their own hysteresis voltage to avoid faulty operation caused by input noises and glitchs. ...
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... BD95710MUV 10. Vout small Ripple Voltage VIN PHA Resistor R3 and capacitor C (=56pF)are needed to stabilize switching operation when Vout ripple voltage is less than 20mV. The values of R1, R2 and R3 are determined as in the formula (19) below R1+R2 ≦ 20kΩ,10×R1 ≦ R3 ・・・(19) www.rohm.com © ...
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... BD95710MUV ●Reference Data VOUT REFIN/ BUSEN VCC Fig1.Sequence VOUT REFIN/ BUSEN VCC Fig4.Sequence VOUT(100mV/div) HG1,HG2(10V/div） IOUT (20A/div) Fig7.Load Transient Response (VCC=12V) VOUT(100mV/div) HG1,HG2(10V/div） IOUT (20A/div) Fig10.Load Transient Response (VCC=5V) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. VOUT REFIN/ ...
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... BD95710MUV ●Reference Data VOUT PHASE1, LGATE Fig13.Continuos MODE (VCC=5V) VOUT PHASE BUSEN Fig16.SCP Function REFIN/ VOUT PHASE1, Fig19.Reference Function IL1, IL2 PHASE1, Fig22.Current balance (Io=20A) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. VOUT PHASE1, LGATE Fig14.Continuos MODE (VCC=8V) VOUT REFIN/ ...
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... BD95710MUV BD95710MUV Evaluation Board Circuit with 5V Drive (VCC=5V input , VIN=3.3~12V input , REFIN/EN=5VCC, ■ ■ Vout=1.2V ) VIN 3.3V ~ 12V C3 U1 BUSEN BD95710MUV_VQFN24 PGND 5 BUSEN VCCDRV 5V VCC C25 22 VCC VCC5 C7 3 5VCC REFIN/EN PHASE1 15 REFIN/EN AGND C18 4 AGND AGND AGND 12 AGND ...
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... BD95710MUV BD95710MUV Evaluation Board Circuit with 8V Drive (VIN=10.8~13.2V input , REFIN/EN=5VCC, Vout=1.2V ) ■ ■ VIN 3.3V ~ 12V C3 U1 BUSEN BD95710MUV_VQFN24 PGND 5 BUSEN VCCDRV VCC C25 22 VCC VCC5 C7 3 5VCC REFIN/EN PHASE1 REFIN/EN 15 AGND C18 4 AGND AGND AGND 12 AGND IOUT ...
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... BD95710MUV BD95710MUV Evaluation Board Circuit with 12V Drive ( VIN=12V input, VCC=8V input, REFIN/EN=5VCC, Vout=1.2V ) ■ ■ VIN 12V C3 BUSEN PGND 5 BUSEN VCCDRV VCC C25 22 VCC VCC5 C7 3 5VCC REFIN/EN PHASE1 REFIN/EN 15 AGND C18 4 AGND AGND AGND 12 AGND ...
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... IC off to prevent thermal runaway not designed to protect the IC or guarantee its operation. Do not continue to use the IC after operating this circuit or use the environment where the operation of this circuit is assumed. BD95710MUV 10. Testing on application boards When testing the application board, connecting a capacitor to a pin with low impedance subjects the IC to stress. ...
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... BD95710MUV 11. Regarding input pin of the IC This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated. P-N junctions are formed at the intersection of these Payers w the N layers of other elements, creating a parasitic diode or transistor. For example, the relation between each potential is as follows: When GND > ...
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... BD95710MUV ●Type Designations (Selections) for Ordering Part No. Part No. VQFN024V4040 4.0±0.1 1PIN MARK S 0.08 S 2.4±0.1 C0 0.75 +0.05 0.25 -0.04 0.5 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved Package MUV : VQFN024V4040 <Tape and Reel information> Tape Embossed carrier tape ...
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