Hi-performance Regurator IC Series for PCs 2Phase Switching Regulator Controllers for Graphic Card No.09030EBT20 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/DC 5V or 12V. High efficiency for the switching regulator can be realized by utilizing an external N-MOSFET power 3 TM transistor. A new technology called H Reg is a Rohm proprietary control method to realize ultra high transient response against load change without phase compensation capacitance and resistance. For various applications, it is available to select the 3 types of N-MOSFET gate drive voltage (12V: for drive ability, 8V: for intermediate drive ability, 5V: for small real estate). ●Features 3 TM 1) H Reg switching Regulator Controller without phase compensation capacitance and resistance 2) Ultra High Tolerance Internal Reference Voltage (+/- 1%) 3) Thermal Shut Down (TSD), Under Voltage LockOut (UVLO), Adjustable Over Current Protection (OCP), Over Voltage Protection (OVP), Short Circuit protection(SCP) built-in 4) Soft start function to minimize rush current during startup 5) switching Frequency Variable (f=200kHz~1000kHz) 6) Internal Bootstrap Diode 7) High Tolerance Current Balance Function 8) VQFN024V4040 Package (4.0mm x 4.0mm x 1.0mm) 9) Integrated 1-/2-phase switching Function ●Applications Graphic Cards, Desktop PC, Gaming Equipments, Digital Components ●Maximum Absolute Ratings (Ta=25℃) Parameter Input Voltage 1 Input Voltage 2 Input Voltage 3 Input Voltage 4 Input Voltage 5 Input Voltage 6 BOOT Voltage BOOT-PHASE Voltage UG-PHASE Voltage PHASE Voltage Power Dissipation Operating Temperature Range Storage Temperature Range Junction Temperature Symbol VCC VIN VCCDRV 5VCC REFIN/EN BUSEN BOOT1/2 BOOT1/2-PHASE UGATE1/2_ PHASE1/2 Pd1 Topr Tstg Tjmax Limit 15 *1 15 *1 15 *1 7 *1 7 *1*2 7 *1 30 *1 15 *1 15 *1 15 0.34 0～+70 -55～+150 +150 Unit V V V V V V V V V V W ℃ ℃ ℃ *1 Do not to exceed Pd. *2 REFIN/EN voltage can not go up higher than 5VCC voltage. ●Operating Conditions (Ta=25℃) Parameter Input Voltage 1 Input Voltage 2 Input Voltage 5 Input Voltage 6 BOOT Voltage BOOT-PHASE Voltage CS Input Voltage IOUT Setting Resistor RT Setting Resistor Symbol VCC VIN REFIN/EN BUSEN BOOT1/2 BOOT1/2-PHASE1/2 CSN1/CSP1/CSN2/CSP2 RIOUT RRT MIN 4.7 3.3 0.4 0 4.5 4.5 0.4 0 10k MAX 13.2 13.2 3.3 3.3 27 13.2 3.3 5M 510k Unit V V V V V V V Ω Ω * This product should not be used in a radioactive environment. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1/20 2009.04 - Rev.B Technical Note BD95710MUV ●ELECTRICAL CHARACTERISTICS (Unless otherwise noted, Ta=25℃, VCC=5V, VIN=12V, REF=1.2V, RT=100kΩ) Standard Value Unit Condition Parameter Symbol MIN TYP MAX [Total Block] Vcc Bias Current Icc 4 10 mA Vcc Standby Current ISTB 1.5 2.0 mA [5Vcc Block] 5Vcc Output Voltage 5Vcc 4.9 5 5.1 V 5Vcc Output Current I5Vcc 20 mA [UVLO Block] VCC Threshold Voltage Vcc_UVLO 4.2 4.5 4.7 V Low High VCC Hysteresis Voltage dVcc_UVLO 130 180 230 mV BUS EN Threshold Voltage BUS_UVLO 0.6 0.8 0.9 V Low High BUS EN Hysteresis Voltage dBUS_UVLO 5 25 50 mV 5Vcc Threshold Voltage 5Vcc_UVLO 4.1 4.3 4.5 V Low High 5Vcc Hysteresis Voltage dVcc_UVLO 100 150 200 mV [Reference Voltage Block] Internal Reference Voltage REFIN/EN 0.594 0.600 0.606 V REFIN/EN=5VCC REFIN/EN Offset Voltage REF_IN REF_IN+10m V VoffREFIN/EN REF_IN-10m REFIN/EN Input Voltage Range 0.4 3.3 V VREFIN/EN REFIN/EN Off Threshold Voltage Vth REFIN/EN 4.5 5Vcc V [EN Threshold] EN Low voltage Enlow GND 0.3 V REFIN/EN voltage EN High voltage Enhigh [Operating Frequency] Oscillation Frequency FOSC ON Time TON MIN OFF Time TOffmin [IREFOUT voltage Block] IREFOUT Voltage VIREFOUT IREFOUT Drive Current IIREFOUT [FET Gate Driver Block] UG high side ON Resistance RonHGH UG low side ON Resistance RonHGL LG high side ON Resistance RonLGH LG high side ON Resistance RonLGL [Regulator for VCC] Output Voltage VCCDRV Vcc DRV Drive Current IVCCDRV [OCP (Over Current Protection) Block] Over Current Threshold OCPTH [OVP (Over Voltage Protection) Block] Over Voltage Threshold 1 OVPTH1 Over Voltage Threshold 2 OVPTH2 [SCP (Short Circuit Protection) Block] SCP Start up Voltage 1 VSCP1 SCP Start up Voltage 2 VSCP2 SCP Delay Time [POK Detection Block] POK Threshold 1 TSCP POKTHLOW1 POK Threshold 2 POKTHLOW2 0.4 - 5Vcc V 100 - 500 200 400 300 500 kHz nsec nsec 1.176 3 1.2 5 1.224 - V mA - 6 4 6 1 12 8 12 2 ohm ohm ohm ohm 7.2 - 8 10 8.8 - V mA 0.95 1 1.05 V VREFx1.25 REFIN/EN x1.25 VREFx1.3 REFIN/EN x1.3 VREFx1.35 REFIN/EN x1.35 V VREFx0.45 REFIN/EN x0.45 - VREFx0.5 REFIN/EN x0.5 1 VREFx0.55 REFIN/EN x0.55 - V VREFx0.7 VREFIN/EN x0.70 VREFx0.75 VREFIN/EN x0.75 VREFx0.80 VREFIN/EN x0.80 REFIN/EN voltage REFIN/EN=5Vcc V REFIN/EN=5Vcc V ms V REFIN/EN=5Vcc V * Design Guarantee www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 2/20 2009.04 - Rev.B Technical Note BD95710MUV ●Block Diagram VIN=12V + Vcc BUSEN BOOT1 2 5 OFF VCCDRV VCC UGATE1 8VReg Controller 21 1 Driver Circuit BG 22 PHASE1 L1 Vout 24 + Vcc 5VCC 3 REFIN/EN 15 AGND 3ms Soft Start 5VReg 0.6V 23 17 4.5V 4 CSP1 CS1CSP2 RT IMAX/IOUT PGND FB Driver Circuit Current Sense 18 OCP 20 OFF OFF 1-/2-Phase switch BUSEN VCC 5VCC UVLO Control Logic 13 EN BG BUFFER 8 TSD SCP EN FB REFIN/EN or 0.3V Vo REFIN/EN or Monitor 0.78V Vout OVP 12 www.rohm.com UGATE2 3/20 7 9 6 L2 + Vcc 14 © 2009 ROHM Co., Ltd. All rights reserved. VIN_EXT 19 11 IREFOUT /POK 16 BOOT2 PHASE2 CSN 2 10 + Vcc H3RegTM Controller Vo Comp LGATE1 LGATE2 CSN2 CSN1 CSP2 PHASE2 CSP1 PHASE1 AGND 2009.04 - Rev.B Technical Note BD95710MUV ●Pin Configuration IREFOUT/ REFIN/ PGND FB UGATE2BOOT2 POK EN 18 17 16 15 14 13 PHASE2 19 12 LGATE2 20 11 RT AGND 10 IMAX/ VCCDRV 21 IOUT/ VCC 22 9 CSP2 LGATE1 23 8 CSN2 PHASE 24 7 CS1- 1 UGAT 2 3 BOOT1 4 5 6 5VCC AGND BUSEN CSP1 ●Pin Function Table PIN No. PIN Name 1 UGATE1 High Side FET Gate Drive Pin 1 2 BOOT1 Supply Voltage for UGATE1 3 5VCC 5V Regulator Output (Iomin=20mA) 4 AGND Sense GND 5 BUSEN Bus Enable, Power Supply Monitoring Pin 6 CSP1 Positive Input of Current Sensing 1 7 CSN1 Negative Input of Current Sensing 1 8 CSN2 Negative Input of Current Sensing 2 9 CSP2 10 IMAX / IOUT 11 RT 12 AGND 13 FB 14 PGND 15 REFIN/EN 16 INREFOUT/ POK PIN Function Positive Input of Current Sensing 2 Current Limit/Output Current Indication PHASEitching Frequency Setting Sense GND Output Voltage Feedback Pin Power GND Pin External Reference Input and Enable Pin Internal Reference Voltage Output and Power Good Output Pin 17 BOOT2 Supply Voltage for UGATE2 18 UGATE2 High Side FET Gate Drive Pin 2 19 PHASE2 switch Node for Channel 2 20 LGATE2 Low Side FET Gate Drive Pin 2 21 VCCDRV Driver for External Linear Regulator 22 VCC 23 LGATE1 Low Side FET Gate Drive Pin 1 PHASE1 PHASEitch Node for Channel 1 24 Exposed Pad www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Supply Voltage Pin FIN 4/20 2009.04 - Rev.B Technical Note BD95710MUV ●Pin Descriptions ・UGATE1 (Pin 1), UGATE2 (Pin 18) These are the voltage supply pins to drive the Gate of the high side FET. This voltage PHASEings between BOOT1/2 and PHASE1/2. High-speed Gate driving for the high side FET is achieved due to the low on-resistance (3 ohm when UG is high, 2 ohm when UG is low) of the driver. ・BOOT1 (Pin 2), BOOT2 (Pin 17) These are the voltage supply pins to drive the high side FET. The maximum absolute ratings are 35V (from GND) and 15V (from PHASE1/2). BOOT1/2 voltages swing between VIN+VCC and VCC during active operation. ・5VCC (Pin 3) This is the internal 5V regulator output pin. The minimum output current capability is 20mA. ・AGND (Pin 4 , Pin12) This is the ground pin for IC internal circuits. It is equivalent to FIN voltage. ・BUSEN (Pin 5) This pin monitors the supply input VIN through resistance divider. The POR rising threshold level is set to 0.8V. ・CsN1 (Pin 6), CsP2 (Pin 9), CsN1 (Pin 7), CsN2 (Pin 8) These pins are connected to both sides of the current sense resistance or Inductance (DCR sensing) to detect output current. ・IMAX / IOUT (Pin 10) 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. ・RT (Pin 11) This is the pin to adjust the switching frequency based on the resistance value. The frequency range is f=50KHz - 1000KHz. ・FB (Pin 13) This is the output voltage feedback pin. It is possible to adjust the output voltage using external resistor divider based on the equation, REFIN/EN≒FB. However, FB becomes 0.6V when REFIN/EN=5VCC. ・PGND (Pin 14) This is the power ground pin connected to the source of the low side FET. ・REFIN/EN/EN (Pin 15) This is an internal or external reference voltage selectable pin. If REFIN/EN is pulled up to 5VCC, internal reference voltage (0.6V) is used. If REFIN/EN is driven by an external voltage ranged 0.4V to 3.3V, external voltage of REFIN/EN voltage is used. It is very convenient for synchronizing external voltage supply. The IC controls the output voltage (REFIN/EN≒FB). And also this pin is used for enable function. If REFIN/EN is less than 0.3V, the whole circuit is shut down. ・IREFOUT/POK (Pin 16) This pin is internal reference voltage output and power good output. During start up, this pin voltage is low. This pin becomes high impedance when FB pin voltage goes beyond 75% of specified FB voltage after soft start ends. ・PHASE1 (Pin 24), PHASE2 (Pin 19) These are the source pins for the high side FET. The maximum absolute ratings are 15V (from GND). PHASE1/2 voltage swings between VIN and GND. ・LGATE1 (Pin 23), LGATE2 (Pin 20) This is the voltage supply to drive the Gate of the low side FET. This voltage swings between VCC and PGND. High-speed Gate driving for the low side FET is achieved due to the low on-resistance (2 ohm when LGATE1/2 is high, 0.5 ohm when LGATE1/2 is low) of the driver. ・VCCDRV (Pin 21) This is the supply voltage pin to drive an external NPN/N_MOSFET for 8V linear regulator. The maximum absolute rating is 15V. ・VCC (Pin 22) This is the power supply pin for IC internal circuit and driver circuit. The maximum circuit current is 10mA. There are 3 usages depending on a supply voltage for driver (5V, 8V, and 12V). It is recommended that a 0.1uF bypass capacitor be put in this pin to avoid voltage fluctuation when the VCC is supplied from 5V or 12V rail directly from the actual platforms. If 8V is used for the supply voltage, this pin is connected to the LDO output. In this case, it is recommended that at least 10uF ceramic capacitor be input to avoid oscillation. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 5/20 2009.04 - Rev.B Technical Note BD95710MUV ●Explanation of Operation The BD95710MUV is a synchronous buck regulator controller incorporating ROHM’s proprietary H3RegTM CONTROLLA control system. When VOUT drops due to a rapid load change, the system quickly restores VOUT by extending the TON time interval. Thus, it serves to improve the regulator’s transient response. 3 TM H Reg control (Normal operation) When FB pin voltage (Vout) falls to a threshold voltage 3 TM REFIN/EN, the drop is detected, activating the H Reg CONTROLLA system. FB REFIN/EN REFIN/EN 1 TON= × VIN f UGAT [sec]・・・(1) UGATE ONTIME is determined with the formula above. LG outputs until the status of VOUT is lower than REF after the status of UG is off. UGA Phase PHASEitch function VIN_EXT BUSEN VOUT REFIN/ EN UGAT UGAT T 2T dual-phase Stand-by Single-phase dual-phase The IC normally operates dual-phase mode, but when the input voltage on the VIN_EXT pin is cut off, the IC latches into single-phase mode. The IC will remain latched in this mode (even if a voltage is reintroduced onto the VIN_EXT pin) until the voltage is cycled on any of the EN, VCC or BUSEN pins. It will then return to two-phase mode. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6/20 2009.04 - Rev.B Technical Note BD95710MUV ●Timing Chart ・Soft Start Function Soft start is activated when REFIN/EN hits its enabling threshold (VCC, 5VCC, and BUSEN have to be beyond their own UVLO thresholds). Current control takes effect at startup, enabling an output voltage “ramping start.” Soft start timing and incoming current are calculated with formulas (2) and below. REFIN/EN TSS SS Soft start time (TSS) ≒ 3msec (fixed) Incoming current VOUT IIN= IIN Co×VOUT 3msec [A] ・・・(2) (Co: Output capacitor) ・Output Over Voltage Protection REFIN/EN x 1.3 When the FB pin voltage becomes REFIN/EN x 1.3, the output over voltage protection is activated and Low side MOSFET becomes ON to lower the output voltage (LG=High, UG=Low). When the output voltage goes back down to the specified level, the whole circuit becomes the normal operation mode. FB UG LG switching ・Short Circuit Protection with Timer Latch REFIN/EN x 0.5 Short Circuit Protection kicks in when output falls to or below REFIN/EN x 0.5. When the programmed time period elapses, output is latched OFF to prevent destruction of the IC. Output voltage can be restored either by reconnecting the REFIN/EN pin (ON OFF ON) or disabling UVLO (HIGH Low High). FB TSCP SCP REFIN/EN or UVLO www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 7/20 2009.04 - Rev.B Technical Note BD95710MUV ●External Component Selection 1. Inductor (L) selection The inductor value is a major influence on the output ripple current. As formula (3) below indicates, the greater the inductor or the switching frequency, the lower the ripple current. ΔIL (VIN-VOUT) x VOUT [A]・・・(3) L x VIN x f The proper output ripple current setting is about 30% of maximum output current. ΔIL= VIN IL ΔIL=0.3×IOUTmax/2. [A]・・・(4) VOUT L L= Co (VIN-VOUT) x VOUT ΔIL x VIN x f [H]・・・(5) (ΔIL: output ripple current; f: switch frequency) 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. ※To minimize possible inductor damage and maximize efficiency, choose a inductor with a low (DCR, ACR) resistance. 2. Output Capacitor (CO) Selection At least 20mV ripple voltage of the FB voltage is recommended by taking the equivalent series resistance and inductance into account. VIN Output ripple voltage is determined as in formula (6) below. VOUT L ESR ΔVOUT=ΔIL×ESR+ESL×ΔIL/TON・・・(6) ESL Co Output Capacitor (ΔIL: Output ripple current; ESR: CO equivalent series resistance, ESL:equivalent series inductance) ※ In selecting a capacitor, make sure the capacitor rating allows sufficient margin relative to output voltage. Note that a lower ESR can minimize output ripple voltage. Please give due consideration to the conditions in formula (7) below for output capacity, bearing in mind that output rise time must be established within the soft start time frame. Co≦ 3msec×(Limit-IOUT/2) VOUT Limit: Current Limit Value ・・・(7) Note: Improper capacitor may cause startup malfunctions. 3. Input Capacitor (Cin) Selection The input capacitor selected must have low enough ESR resistance to fully support large ripple output, in order to prevent extreme over current. The formula for ripple current IRMS is given in (8) below. VIN Cin VOUT L Co IRMS= IOUT 2 x √VOUT(VIN-VOUT) VIN Where VIN=2×VOUT, IRMS= [A]・・・(8) IOUT 4 Input Capacitor A low ESR capacitor is recommended to reduce ESR loss and maximize efficiency. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 8/20 2009.04 - Rev.B Technical Note BD95710MUV 4.MOSFET Selection Pmain=PRON+PGATE+PTRAN Loss on the main MOSFET = VOUT 4 x VIN x RON x IOUT2 + Ciss x f x VDD+ 2 VIN x Crss x IOUTx f ・・・(9) 2 x IDRIVE (Ron: On-resistance of FET; Ciss: FET gate capacity; f: switching frequency Crss: FET inverse transfer function; IDRIVE: Gate peak current) Loss on the synchronous MOSFET Psyn=PRON+PGATE = VIN-VOUT ×RON×IOUT2+Ciss×f×VDD ・・・(10) 4 x VIN 5. OCP Setting Resistance IOUT VIN_BUS VOUT VIN_EXT IL L r L RL C Co r r RL C IIMAX = Co 250kΩ ＋ VCSP2―VCSN2 ・・・(11) 250kΩ (VCSP1―VCS1-=IL× RL , RL= L r×C If VIMAX meet the following condition, OCP becomes activated. IMAX PIN VIMAX≦IIMAX×RIMAX RIMAX (VIMAX: OCP Setting Voltage, VIMAX=1V) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. ) (RL: the DCR value of coil) VIMAX IIMAX VCSP1―VCS1- r CSP1 CS1CSP2 CSN2 OCP OCP threshold is determined by external OCP setting resistance (RIMAX) and IMAX calculated below. 9/20 2009.04 - Rev.B Technical Note 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. VIN BUSEN R H3RegTM REFIN/EN CONTROLLA Q VOUT Driver S Circuit FB The output voltage is calculated as follow when resistor divider network is connected between the FB and VOUT. REFIN/EN set 5Vcc. Vout = R1+R2 x 0.6 [V]・・・(12) R2 VIN BUSEN 0.6V H3RegTM R CONTROLLA S Q VOUT Driver Circuit FB R1 R2 7. Frequency Setting Resistance The Frequency at steady state is determined by resistance value connected to RT pin. But actual PHASE rising time and falling time are factored in due to the external MOSFET gate capacity or switching speed. As a result, On-Time increases. The frequency is determined by the following formula. f [Hz]= Ton = VOUT VIN × 1 Ton ・・・(13) -12 10 ×REFIN/EN×RRT 2×BUSEN + 170×10-9 Ton : ON TIME Consequently, total frequency becomes lower than the formula above. On-Time increases by Dead Time on the condition of zero cross point of inductor current. And also switching frequency increases as the output current increases due to the fixed On-Time and the influence of conduction loss. It is recommended that switching frequency be checked on large current condition (at the point where the inductor current doesn’t become reversed from Vout). www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 10/20 2009.04 - Rev.B Technical Note 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. Hysteresiwindow HysVCC VCC 5VCC Hys5VCC BUSEN HysBUSEN VOUT Tss Output OFF VCCUVLO 9. Current Phase Balance Tss Tss Output OFF Output OFF 5VCCUVLO VCCUVLO Tss （Tss: Soft Start Time） Output OFF BUSENUVLO Output OFF VCCUVLO VOUT VIN_BUS VIN_EXT IL1 L1 RL1 r1 C1 IL2 Co r1 ΔVcs2 CS1- RL2 r2 C2 Co r2 CSP1 ΔVcs1 L2 CSP2 CSN2 BD95710MUV keeps the current phase balance between coil current IL1 and IL2 by controlling the status ΔVcs1 = Δ Vcs2.And for that, it is needed to meet the reference formula below. L1 = L2 (RL1 =RL2), r1 = r2, C1 = C2. ・・・(14) For detecting the value of ΔVcs1 or ΔVcs2 exactly, it is also needed to meet the formula below. RL1 = L1 r1×C1 ・・・(15) However, Vcs+ and Vcs- are fed a small current from current sense amplifier, and this current causes a slight difference in the actual value obtained from formula (15). Refer to formula (16) below: PHA ⊿V ⊿Vcs=⊿V- I×r ・・・(16) r r2 I ⊿Vcs=(⊿V- I x r) + I x r2・・・(17) I To eliminate the difference, choose r2 to have the same value as r. ⊿Vcs Vcs+ This difference can be compensated for by adding resistor r2. Vcs- www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. ⊿Vcs=⊿V・・・(18) 11/20 2009.04 - Rev.B Technical Note BD95710MUV 10. Vout small Ripple Voltage VIN PHA VOUT R3 FB R2 R1 C=56pF 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 © 2009 ROHM Co., Ltd. All rights reserved. 12/20 2009.04 - Rev.B Technical Note BD95710MUV ●Reference Data VOUT VOUT VOUT REFIN/ REFIN/ REFIN/ BUSEN BUSEN BUSEN VCC VCC VCC Fig1.Sequence Fig3.Sequence Fig2.Sequence VOUT VOUT REFIN/ REFIN/ BUSEN BUSEN BUSEN VCC VCC VCC Fig4.Sequence VOUT REFIN/ Fig6.Sequence Fig5.Sequence VOUT(100mV/div) VOUT(100mV/div) VOUT(100mV/div) HG1,HG2(10V/div） HG1,HG2(10V/div） HG1,HG2(10V/div） IOUT IOUT (20A/div) Fig7.Load Transient Response (VCC=12V) VOUT(100mV/div) Fig8.Load Transient Response (VCC=12V) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Fig9.Load Transient Response (VCC=5V) VOUT(100mV/div) HG1,HG2(10V/div） HG1,HG2(10V/div） IOUT (20A/div) (20A/div) Fig10.Load Transient Response (VCC=5V) (20A/div) (20A/div) VOUT(100mV/div) HG1,HG2(10V/div） IOUT IOUT Fig11.Load Transient Response (VCC=8V) 13/20 IOUT (20A/div) Fig12.Load Transient Response (VCC=8V) 2009.04 - Rev.B Technical Note BD95710MUV ●Reference Data VOUT VOUT VOUT PHASE1, PHASE1, PHASE1, LGATE LGATE LGATE Fig13.Continuos MODE (VCC=5V) Fig14.Continuos MODE (VCC=8V) Fig15.Continuos MODE (VCC=12V) VOUT VOUT VOUT REFIN/ PHASE PHASE PHASE IOUT 1msec BUSEN REFIN/ Fig16.SCP Function Fig18.Soft Start Fig17.SCP Function REFIN/ f = 400kHz 390 100 8V DRIVE 90 370 80 PHASE1, 12V DRIVE 70 efficiency[%] VOUT f[kHz] 350 330 310 60 50 40 30 290 20 270 10 0 250 0 10 20 30 40 50 1 10 Iout[A] Fig19.Reference Function 5V DRIVE 100 Iout[A] Fig20.Frequency range functionally Fig21.Efficiency IL1, IL2 IL1, IL2 PHASE1, Fig22.Current balance (Io=20A) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. IL1, IL2 PHASE1, PHASE1, Fig23.Current balance (Io=30A) 14/20 Fig24.Current balance (Io=40A) 2009.04 - Rev.B Technical Note BD95710MUV ■ BD95710MUV Evaluation Board Circuit with 5V Drive (VCC=5V input , VIN=3.3~12V input , REFIN/EN=5VCC, Vout=1.2V ) VIN U1 BD95710MUV_VQFN24 BUSEN 5 BUSEN BOOT1 2 21 VCC VCCDRV C2 M3 M2 UGATE1 1 C5 PGND 22 VCC5 3 PHASE1 5VCC LGATE1 PHASE1 56pF M8 20 CSN2 8 PGND 7 R21 PGND FB REFOUT_POK 16 R18 C27 C17 C16 C15 PGND PGND PGND L2 PGND PGND PGND PGND PGND IOUT CSN1 13 M9 LGATE2 PGND 14 C21 ×２ RT PGND PGND PHASE2 19 IOUT 10 PGND PGND PGND AGND RT 11 M7 PGND C12 12 AGND M6 UGATE2 18 C11 AGND AGND R15 17 C14 BOOT2 PGND C13 REFIN/EN C10 AGND PGND PGND C19 4 R9 L1 100kΩ AGND R8 M5 VOUT 15 C18 M4 23 FB CSP2 POK CSP1 R16 R20 9 R17 6 HS AGND C24 REFIN/EN PGND 24 C23 C7 PGND ×２ VCC 100kΩ C25 C9 5V C28 R3 C8 R2 C3 PGND C31 3.3V ~ 12V ■BD95710MUV Evaluation Board Parts List Part No U1 M2 M3 M4 M5 M6 M7 M8 M9 C2 C3 C5 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 Value Company Part name 10uF 1uF 1uF 10uF 10uF 10uF 10uF 10uF 820uF 820uF 820uF - ROHM infineon infineon Infineon Infineon Infineon Infineon Infineon infineon KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA SANYO SANYO SANYO - BD95710MUV BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG CT32X5R106K25A CM05B105K16A CM105B105K16A CM316X5R106M06A CM21B106M06A CM21B106M06A CM21B106M06A CM21B106M06A NC641-643 NC641-643 NC641-643 - www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Part No C17 C18 C19 C21 C23 C24 C25 C27 C28 C31 R2 R3 R8 R9 R15 R16 R17 R18 R20 R21 L1 L2 15/20 Value Company Part name 1uF 10uF 1uF 0.1uF 0.1uF 10uF 10uF 10uF 10uF 300kΩ 30kΩ 240kΩ 3.6MΩ 10kΩ 4.87kΩ 4.87kΩ 10kΩ 4.87kΩ 4.87kΩ 0.47uH 0.47uH KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM Cyntec Cyntec CM05B105K06A CT32X5R106K25A CM105B105K16A CM105X5R224K25A CM105X5R224K25A CM316X5R106M10A CM316X5R106M06A CT32X5R106K25A CT32X5R106K25A MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 PCMB105T-R47MS PCMB105T-R47MS 2009.04 - Rev.B Technical Note BD95710MUV ■BD95710MUV Evaluation Board Circuit with 8V Drive (VIN=10.8~13.2V input , REFIN/EN=5VCC, Vout=1.2V ) BUSEN PGND 5 U1 BD95710MUV_VQFN24 BUSEN BOOT1 2 21 VCC VCCDRV UGATE1 C2 M3 M2 1 C28 R3 C5 PGND 22 PGND VCC5 3 LGATE1 PHASE1 CSN2 13 M9 C17 C16 C15 C14 C13 C21 M8 20 PGND PGND PGND PGND C12 C11 C10 C9 19 8 PGND 7 R21 FB REFOUT_POK 16 R18 C27 AGND PGND CSN1 PGND PGND L2 PGND PGND PGND PGND PGND IOUT PGND 220pF PGND PGND PGND C8 PHASE2 RT LGATE2 14 M7 AGND IOUT 10 M6 18 PGND RT 11 PGND 17 AGND UGATE2 12 R15 PGND 100kΩ 4 AGND R9 L1 C19 REFIN/EN BOOT2 AGND R8 23 M5 VOUT 15 AGND C18 M4 FB CSP2 POK CSP1 R16 R20 9 R17 HS AGND 6 C24 REFIN/EN PHASE1 5VCC 24 C23 C7 PGND VCC 100kΩ C25 C31 C3 R1 3.3V ~ 12V R２ VIN ■BD95710MUV Evaluation Board Parts List Part No U1 M2 M3 M4 M5 M6 M7 M8 M9 C2 C3 C5 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 Value Company Part name 10uF 1uF 1uF 10uF 10uF 10uF 10uF 10uF 820uF 820uF 820uF - ROHM infineon infineon Infineon Infineon Infineon Infineon Infineon infineon KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA SANYO SANYO SANYO - BD95710MUV BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG CT32X5R106K25A CM05B105K16A CM105B105K16A CM316X5R106M06A CM21B106M06A CM21B106M06A CM21B106M06A CM21B106M06A NC641-643 NC641-643 NC641-643 - www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Part No C18 C19 C21 C23 C24 C25 C27 C28 C31 R1 R2 R3 R8 R9 R15 R16 R17 R18 R20 R21 L1 L2 16/20 Value Company Part name 1uF 10uF 1uF 0.1uF 0.1uF 10uF 10uF 10uF 10uF 10kΩ 300kΩ 30kΩ 240kΩ 3.6MΩ 10kΩ 4.87kΩ 4.87kΩ 10kΩ 4.87kΩ 4.87kΩ 0.47uH 0.47uH KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM Cyntec Cyntec CM05B105K06A CT32X5R106K25A CM105B105K16A CM105X5R224K25A CM105X5R224K25A CM316X5R106M10A CM316X5R106M06A CT32X5R106K25A CT32X5R106K25A MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 PCMB105T-R47MS PCMB105T-R47MS 2009.04 - Rev.B Technical Note BD95710MUV ■BD95710MUV Evaluation Board Circuit with 12V Drive ( VIN=12V input, VCC=8V input, REFIN/EN=5VCC, Vout=1.2V ) VIN U1 BD95710MUV_VQFN24 BUSEN 5 BUSEN BOOT1 2 21 VCC VCCDRV UGATE1 C2 M3 M2 1 C28 R3 C5 PGND 22 VCC5 3 PHASE1 5VCC LGATE1 PHASE1 PHASE2 RT LGATE2 CSN2 220pF PGND CSN1 M8 M9 8 PGND 7 R21 FB 13 C17 C16 C15 PGND PGND C12 19 20 PGND L2 PGND PGND PGND PGND PGND IOUT PGND 14 PGND PGND AGND IOUT 10 PGND PGND PGND PGND RT 11 M7 C8 12 M6 18 C11 UGATE2 C10 AGND C13 PGND 17 AGND AGND PGND PGND C31 BOOT2 4 R9 L1 C19 REFIN/EN AGND R8 M5 VOUT 15 C18 M4 23 C21 REFIN/EN PGND 24 100kΩ C7 PGND VCC 100kΩ C25 C14 R2 C3 PGND C9 12V FB CSP2 POK CSP1 R16 R20 9 R15 HS AGND C24 AGND R17 6 C23 REFOUT_POK 16 R18 C27 ■BD95710MUV Evaluation Board Parts List Part No U1 M2 M3 M4 M5 M6 M7 M8 M9 C2 C3 C5 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 Value Company Part name 10uF 1uF 1uF 10uF 10uF 10uF 10uF 10uF 820uF 820uF 820uF - ROHM infineon infineon Infineon Infineon Infineon Infineon Infineon infineon KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA SANYO SANYO SANYO - BD95710MUV BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG CT32X5R106K25A CM05B105K16A CM105B105K16A CM316X5R106M06A CM21B106M06A CM21B106M06A CM21B106M06A CM21B106M06A NC641-643 NC641-643 NC641-643 - www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Part No C17 C18 C19 C21 C23 C24 C25 C27 C28 C31 R2 R3 R8 R9 R15 R16 R17 R18 R20 R21 L1 L2 17/20 Value Company Part name 1uF 10uF 1uF 0.1uF 0.1uF 10uF 10uF 10uF 10uF 300kΩ 30kΩ 240kΩ 3.6MΩ 10kΩ 4.87kΩ 4.87kΩ 10kΩ 4.87kΩ 4.87kΩ 0.47uH 0.47uH KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM Cyntec Cyntec CM05B105K06A CT32X5R106K25A CM105B105K16A CM105X5R224K25A CM105X5R224K25A CM316X5R106M10A CM316X5R106M06A CT32X5R106K25A CT32X5R106K25A MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 PCMB105T-R47MS PCMB105T-R47MS 2009.04 - Rev.B Technical Note BD95710MUV ●Operation Notes 1. Absolute maximum ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. If any over rated values wll expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. 2. Connecting the power supply connector backward Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the power supply lines. An external direction diode can be added. 3. Power supply lines Design PCB layout pattern to provide low impedance GND and supply lines. To obtain a low noise ground and supply line, separate the ground section and supply lines of the digital and analog blocks. Furthermore, for all power supply terminals to ICs, connect a capacitor between the power supply and the GND terminal. When applying electrolytic capacitors in the circuit, not that capacitance characteristic values are reduced at low temperatures. 4. GND voltage The potential of GND pin must be minimum potential in all operating conditions. 5. Thermal design Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions. 6. Inter-pin shorts and mounting errors Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any connection error or if pins are shorted together. 7. Actions in strong electromagnetic field Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to malfunction. 8. ASO When using the IC, set the output transistor so that it does not exceed absolute maximum ratings or ASO. 9. Thermal shutdown circuit The IC incorporates a built-in thermal shutdown circuit (TSD circuit). The thermal shutdown circuit (TSD circuit) is designed only to shut the IC off to prevent thermal runaway. It is not designed to protect the IC or guarantee its operation. Do not continue to use the IC after operating this circuit or use the IC in an environment where the operation of this circuit is assumed. BD95710MUV TSD on temperature [°C] (typ.) 175 Hysteresis temperature [°C] (typ.) 15 10. Testing on application boards When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to stress. Always discharge capacitors after each process or step. Always turn the IC's power supply off before connecting it to or removing it from a jig or fixture during the inspection process. Ground the IC during assembly steps as an antistatic measure. Use similar precaution when transporting or storing the IC. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 18/20 2009.04 - Rev.B Technical Note 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 > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode. When GND > Pin B, the P-N junction operates as a parasitic transistor. Parasitic diodes can occur inevitable in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits, operational faults, or physical damage. Accordingly, methods by which parasitic diodes operate, such as applying a voltage that is lower than the GND (P substrate) voltage to an input pin, should not be used. Resistor Transistor (NPN) Pin A Pin B C Pin B B E Pin A P+ N N P+ P N N P substrate Parasitic element Parasitic element GND P+ B N P+ P N C E P substrate Parasitic element GND GND GND Parasitic element Other adjacent elements 12. Ground Wiring Pattern When using both small signal and large current GND patterns, it is recommended to isolate the two ground patterns, placing a single ground point at the ground potential of application so that the pattern wiring resistance and voltage variations caused by large currents do not cause variations in the small signal ground voltage. Be careful not to change the GND wiring pattern of any external components, either. ●Power Dissipation Power dissipation:Pd [W] 4.0 2 4 layers (Copper foil area : 5505mm ) copper foil in each layers. θj-a=35.1℃/W 2 ② 4 layers (Copper foil area : 10.29m ) copper foil in each layers. θj-a=103.3℃/W 2 ③ 4 layers (Copper foil area : 10.29m ) θj-a=178.6℃/W ④IC only. θj-a=367.6℃/W ① ①3.56W 3.0 2.0 ②1.21W 1.0 ③0.70W ④0.34W 0 0 25 50 75 100105 125 150 Ambient temperature:Ta [℃] Fig.25 Thermal derating curve (VQFN020V4040) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 19/20 2009.04 - Rev.B Technical Note BD95710MUV ●Type Designations (Selections) for Ordering B D 9 Part No. 5 7 1 0 M Part No. U V - Package MUV : VQFN024V4040 E 2 Packaging and forming specification E2: Embossed tape and reel VQFN024V4040 <Tape and Reel information> 4.0±0.1 4.0±0.1 1.0MAX 2.4±0.1 0.4±0.1 7 12 19 18 0.5 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 ) 6 24 0.75 E2 2.4±0.1 1 2500pcs (0.22) +0.03 0.02 -0.02 S C0.2 Embossed carrier tape Quantity Direction of feed 1PIN MARK 0.08 S Tape 13 +0.05 0.25 -0.04 1pin (Unit : mm) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Reel 20/20 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2009.04 - 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. 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