Power Supply IC Series for TFT-LCD Panels 5V Input Multi-channel System Power Supply IC BD9862MUV No.10035EAT16 ●Description The BD9862MUV is a 3ch system power supply for mobile TFT liquid crystal panels.Operable at VBAT=1.8V, CH2 & CH3 adopts the original PWM/PFM automatic switching control charge pump and realizes high efficiency in full-load range. ●Features 1) Input voltage range: 1.8V~4.5V (The input voltage can be 5.5V if a double charge pump is not used) 2) The step-up switching regulator has a built-in output FET (CH1) 3) There is a built-in PWM/PFM automatic switching charge pump circuit with a fixed PWM terminal (CH2,3) 4) Switching regulator oscillation frequency: MHz(typ.) 5) Charge pump oscillation frequency: 500kHz(typ.) 6) There is a built-in circuit to discontinue output (timer latch type) in the event of overload 7) Package VQFN024V4040 ●Applications Small & medium TFT liquid crystal displays etc. ●Absolute Maximum Ratings (Ta = 25°C) Parameter Maximum adding power supply voltage Maximum adding voltage Symbol VBAT LX FB1, INV1, INV2, UVLOSET, C2N, VIN2A, CN, CP, CPOUT, REGOUT, PWM, RT ,VREF ,NON3 VIN3, C3P, Vo2, C2P, VIN2B Power dissipation Unit V -0.3~7 V -0.3~15.5 0.34(*1) 0.70(*2) -40 ~ +85 -55 ~ +150 +150 Pd Operating temperature range Storage Temperature Range Junction temperature Ratings -0.3 ~ 7 -0.3 ~ 18 Topr Tstg Tjmax W ℃ ℃ ℃ (*1) When used as a stand-alone IC (for Ta=25℃ and over), the value is reduced by 27mW/℃. (*2) When used for Printed Circuit Boards (glass epoxy board of 74.2mm×74.2mm×1.6mm) mounting for Ta=25℃ and over, the value is reduced by 5.6mW/℃. ●Operating Conditions(Ta=25℃) VBAT Vo1 Vo2 Vo3 MIN 1.8 -15 Ratings TYP - MAX 4.5(※1) 15 15 - Cflys,Cflya 0.1 0.22 - µF Cflyi 0.022 0.047 - µF CCPOUT fOSC1 fOSC2 Iidn1 1.0 700 350 - 2.0 1.0 500 - 1.4 700 1.0 µF MHz kHz A Parameter Symbol Power Supply Voltage CH1Output Voltage CH2 Output Voltage CH3 Output Voltage Starting capacity, adding charge pump flying capacitor Reversing capacity charge pump flying capacitor Starting charge pump Output capacitance Switching regulator oscillation frequency Charge pump oscillation frequency CH1 PowerNMOS Drain current Unit condition V V V V CCPOUT≧Cfly*10 RRT=82kΩ~180kΩ RRT=82kΩ~180kΩ (※1) When using a double charge pump for starting. 5.5V when not using a double charge pump www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 1/16 2010.03 - Rev.A Technical Note BD9862MUV ●Electrical Characteristics (unless otherwise specified,Ta=25℃,VBAT=2.5V) Limits Parameter Symbol MIN TYP MAX Unit Condition 【Starting circuit part】 Output voltage Vcpout 3.7 4.2 4.7 V Vst - - 1.8 V CH1Soft start time Tss1 0.5 1.0 2.0 ms RRT=120kΩ CH2 Soft start time Tss2 3.5 5.0 6.5 ms RRT=120kΩ CH3 Soft start time Tss3 3.5 5.0 6.5 ms RRT=120kΩ Switching regulator frequency fosc1 0.9 1.0 1.1 MHz RRT=120kΩ Charge Pump Frequency fosc2 450 500 550 kHz RRT=120kΩ VREGOUT 3.4 3.5 3.6 V MAX Duty1 Dmax1 85 90 95 % MAX Duty2 Dmax2 40 45 50 % MAX Duty3 Dmax3 40 45 50 % INV1Threshold Voltage VINV1 0.985 1.0 1.015 V INV2Threshold Voltage VINV2 0.985 1.0 1.015 V NON3Threshold Voltage VNON3 0.985 1.0 1.015 V CH3 Error amplifier off set voltage Voffset -50 0 50 mV NMOSFET ON Resistance RonN1 0.2 0.45 0.7 Ω REGOUT=3.5V Leak current when NMOSFET OFF IreakN1 - - 10 µA UVLOSET=0V R2 - 53 90 Ω Io=0~10mA,VIN2A=3.5V, VIN2B=10V,INV2=GND PMOS RonP3 - 20 40 NMOS RonN3 - 10 20 Ω VIN3=10V VBAT Voltage to start operation Iout=0~10mA 【Soft start part】 【Oscillation circuit 】 【Regulator】 Output Voltage Iout=0~10mA,VBAT=2.0V~4.5V 【PWM Comparator】 【Error amplifier】 Making VREF as absolute value 【Output part(Switching Regulator 】 【Adding step-up charge pump】 Output impedance 【Inverted charge pump】 Output FET ON resistance 【Control Terminal Part】 PWM Terminal pull down resistance RPWM 0.5 1 2 MΩ Operation VPWMH 1.2 - VBAT V PWM Fixed mode Non-operation VPWML 0 - 0.3 V PWM/PFM Auto shift mode Latch 110 131 150 ms Relief voltage threshold UVth 0.97 1.0 1.03 V Hysteresis UVhy 50 75 100 mV IVBAT 0.4 0.8 1.6 mA PWM Terminal control voltage 【Short circuit protection circuit】 Timer Latch Time RRT=120kΩ 【UVLO】 【Circuit current】 Circuit current during operation (VBAT terminal inflow current) VBAT=5V, UVLOSET=INV1=INV2=5V NON3=-0.2V ◎It is not the radiation-proof design for this product. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 2/16 2010.03 - Rev.A Technical Note BD9862MUV ●Power Dissipation Reduction 4.5 ①: Stand-alone IC ②: One-layer substrate (Surface-layer heat release copper foil 0mm2) ③: Four-layer substrate (Surface and inside-layer heat release copper foil 10mm2) (2, 3 layer heat release copper foil 5505mm2) ④: Four-layer substrate (All-layers heat release copper foil 5505mm2) 4.0 ④3.56W Power Dissipation Pd （W) 3.5 3.0 ① ② ③ ④ 2.5 ③2.21W : θja = 367.6℃/W : θja = 178.6℃/W : θja = 56.6℃/W : θja = 35.1℃/W 2.0 1.5 1.0 ②0.70W 0.5 ①0.34W 0.0 0 25 50 75 100 125 150 Ambient Temperature Ta(℃) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 3/16 2010.03 - Rev.A Technical Note BD9862MUV 90 90 85 80 75 70 65 60 55 50 45 40 L=15uH 80 75 PWM MODE 70 46 44 PWM MODE 42 40 38 36 65 10 Load current[mA] 100 0.1 1 Load current[mA] 0.1 10 Fig.2 CH2 Current Load to Efficiency (VIN2A=3.5V,VIN2B=10V,Vo2=12V) 1 Load current[mA] 10 Fig.3 CH3 Current Load to Efficiency (VIN3=10V,Vo3=-5V) 3.518 3.520 3.6 3.58 3.57 3.56 REGOUT voltage[V] 3.516 3.59 REGOUT voltage[V] REGOUT voltage[V] efficiency[%] L=4.7uH Fig.1 CH1Current Load to Efficiency (Vo1=10V) 3.515 3.510 3.505 3.514 3.512 3.510 3.508 3.506 3.500 3.55 0 5 10 Load current[mA] 3.504 3.6 15 Fig.4 REGOUT Output Load Regulation 4.0 4.4 4.8 5.2 CPOUT voltage[V] -40 1.003 1.002 1.005 1.004 1.003 1.002 -40 -15 10 35 60 85 -15 Ta[℃] 10 35 60 1.009 -40 -15 10 Fig.8 INV2 Threshold Voltage Temperature Feature 1000 995 985 Fig.10 CH1 FB1VoltageOn Duty Feature www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. -40 -15 10 35 Ta[℃] 60 85 Fig.11 CH1 Switching Frequency Temperature Feature 4/16 60 85 Fig.8 NON3 Threshold Voltage Temperature Feature frequency[kHz] frequency[kHz] 1005 990 2 35 Ta[℃] 1010 1 1.2 1.4 1.6 1.8 FB1 voltage[V] 1.010 85 1015 0.6 0.8 85 1.011 Ta[℃] 100 90 80 70 60 50 40 30 20 10 0 60 1.008 -40 Fig.7 INV1 Threshold Voltage Temperature Feature 35 1.012 NON3 threshold voltage[V] INV2 threshold voltage[V] 1.004 10 Fig.6 REGOUT Output Voltage Temperature Feature 1.006 1.005 -15 Ta[℃] Fig.5 REGOUT Output Line Regulation 1.006 INV1 threshold voltage[V] PWM/PFM MODE 48 85 1 Duty[%] 50 PWM/PFM MODE efficiency[%] efficiency[%] ●Reference Data(Unless specified Ta=25℃,VCC=2.5V,RRT=120kΩ) 1050 1040 1030 1020 1010 1000 990 980 970 960 950 2 3 4 VBAT[V] 5 Fig.12 CH1 Switching Frequency to VBAT Voltage Feature 2010.03 - Rev.A Technical Note BD9862MUV 91.2 5.06 91.1 91 5.04 5.02 5 4.98 4.94 -15 10 35 Ta[℃] 60 85 90.9 90.8 90.7 90.6 90.5 90.4 4.96 -40 90.3 -40 -15 10 35 Ta[℃] 60 85 -40 Fig.13 CH1 Soft Start Temperature Feature Fig.14 CH2,CH3 Soft Start Temperature Feature 46 45.9 45.8 45.7 45.6 45.5 45.4 45.3 45.2 45.1 45 1500 -15 10 35 Ta[℃] 60 85 Fig.15 CH1 Max Duty Temperature Feature 1400 1300 frequency[kHz] Max duty[%] 5.08 Max duty[%] 1.01 1.005 1 0.995 0.99 0.985 0.98 0.975 0.97 0.965 0.96 0.955 soft start time[ms] soft start time[ms] ●Reference data(Unless specified Ta=25℃,VCC=2.5V) 1200 1100 1000 900 800 700 600 -40 -15 10 35 Ta[℃] 60 85 60 Fig.16 CH2,CH3 Max Duty Temperature Feature 80 100 120 140 160 180 200 R RT [kOhm] Fig.17 RT Resistance to CH1 Switching Frequency Feature ●Block Diagram CP CN REGOUT CPOUT INV1 VBAT VBAT FB1 REGOUT Error Amp1 VBAT VBAT + + - VBAT CPOUT 500kHz CLK Ring OSC for startup PFM Control SELECTOR CLK ×2 CPOUT 1.2V + REGOUT UVLO H:Vout OFF L:Vout ON + - LX Step Up Switching Control 1.0V SS1 OK Soft Start LDO C.P. PWM Comp1 PGND1 Max Duty1 REGOUTUVLO:L OK INV2 CLK Control Comp VIN2A ref2 + - 500kHz CLK REGOUT Error Amp2 1MHz SLOPE RT Soft Start 1.0V CLK C2N DRIVER PWM Comp2 + - PWM/PFM Control PGND2 Max Duty CP SS2 OK Min Duty OSC VIN2B PWM SS3 OK VBAT 1/2 f Max Duty1 REGOUT TSD 1.2V VBATUVLO:L PWM H：PWM L：PWM/PFM Auto 1.0V VBATUVLO:L VIN3 Error Amp3 + PWM Comp3 PWM/PFM Control Min Duty VBAT VREF PWM PGND2 1.0V/0.9V NON3 ref1(1.0V) REGOUT ref2(1.0V) 0.7V INV1 - 1.2V ErrAmpOUT2 ErrAmpOUT3 2.0V + + + C3P VBAT + UVLOSET DRIVER Max Duty CP VBAT VBATUVLO H:IC OFF L:IC ON VO2 Min Duty + VREF & IREF C2P DRIVER DISCHARGE Max Duty CP SCP COUNTER SCPOUT CHI-CH3 Driver stop CH1～CH3ドライバー停止 REGOUT UVLO:L 1.0V Soft Start CLK SCPCOMP SS2 OK SS3 OK + - VBAT GND VREF Buffer SS1 OK Fig.18 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 5/16 2010.03 - Rev.A Technical Note BD9862MUV ●Terminal Location Diagram 18 17 16 15 14 13 19 12 20 11 21 10 22 9 23 8 24 7 1 2 3 4 5 6 Fig.19 ●Terminal Number and Terminal Name and Function Terminal Number Terminal Name 1 FB1 Error amplifier output terminal for CH1 2 INV2 Error amplifier inverted input terminal for CH1 3 UVLOSET 4 VIN3 Reversing charge pump input terminal 5 C3P Reversing charge pump. Flying capacitor H-side input terminal 6 PGND2 7 C2N 8 VIN2A 9 VO2 Adding step-up charge pump output terminal 10 C2P Adding step-up charge pump. Flying capacitor H-side input terminal 11 VIN2B 12 LX 13 PGND1 14 CN Start-up charge pump. Flying capacitor L-side input terminal 15 CP Start-up charge pump .Flying capacitor H-side input terminal 16 VBAT 17 CPOUT 18 REGOUT 19 PWM Charge pump block PWM/PFM switching terminal 20 GND Grounding terminal 21 RT 22 VREF Standard voltage output terminal 23 NON3 Non-reversing input terminal of error amplifier for CH3 24 INV1 Reversing input terminal of error amplifier for CH1 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. Function UVLO Standard voltage terminal Built-in EFT grounding terminal for CH2,3 Adding step-up charge pump. Flying capacitor L-side input terminal Adding step-up charge pump input terminal Adding step-up charge pump input terminal Inductor connecting terminal Built-in FET grounding terminal for CHI1 Power supply input terminal Start-up charge pump output terminal Regulator output terminal Connecting terminal of resistor for frequency timing setting 6/16 2010.03 - Rev.A Technical Note BD9862MUV ●System Description BD9862MUV is a 3ch system power supply optimized for TFT liquid crystal displays. Features of each channel are explained as follows ○CH1 This is a voltage mode switching regulator with a built-in high voltage-resistant output FET. Capable of high-speed operation at the maximum switching frequency of 1.4MHz, and compatible with a high step-up ratio with Max Duty of 90%(typ.). ○CH2 It’s a PWM/PFM automatic switching control with a variable-voltage adding charge pump. Due to intermittent switching at the time of PFM mode, the switching loss is reduced, so high efficiency is realized even in light load conditions. Moreover, it is capable of operating at the maximum switching frequency of 700KHz because of a built-in high voltage resistant, high-speed FET driver. In addition, it is equipped with an On Duty prediction function, so the output voltage ripple is lowered considerably even at the time of PFM operation.Due to the built-in output discharge resistor (1kΩ typ.) and FET phase compensation circuit, it can operate with two capacitors and two resistors. ○CH3 It includes a PWM/PFM automatic switching control, variable-voltage reversing charge pump controller. The control method is the same as CH2. ●Block functional descriptions ・Error amplifier block Detects the output voltage with INV terminal (NON3 terminal in case of CH3), amplifies the error between it and standard voltage, and outputs from the FB terminal. The accuracy is ±1%(1.5% in case of CH2 & CH3). ・PWM(Pulse Width Modulation)Convertor block The PWM convertor inputs the error detected by the error amplifier and outputs the PWM signal by comparing with a saw-tooth wave. ・PWM/PFM Control Block Due to the input of the PWM terminal, this block switches the CH2 & CH3 between the fixed PWM mode and the automatic switching mode of PFM(Pulse Frequency Modulation)/PWM. At the time of PFM mode, the efficiency under a light load is raised by controlling and making the lowest On Duty of PWM signal to be 7%(typ.) and reducing the number of switching times. ・LDO Block This is a power supply to operate the internal circuit. In addition, it can be used as input of VIN2B. The output voltage is 3.5V(typ.), and the maximum load is 10mA. Moreover, due to a built-in UVLO, the release voltage is 2.5V(typ) and the protective voltage is 2.4V(typ). ・Start-up Charge Pump Block If REGOUT is ≦2.5V(typ.), then the ring oscillator, which operates at 500kHz or so, is started and the double charge pump is operated. The clock pulse is controlled in such a way that the output voltage of this charge pump becomes 4.2V(typ.). Moreover, if REGOUT becomes more than 2.5V(typ.) (i.e. REGOUT＞2.5V(typ.)), then the clock is supplied from the main OSC that creates a saw tooth wave. If the input voltage is usually more than 4.5V, then it is possible to bypass the start-up circuit. (refer to the application example) ・OSC Block It generates a saw-tooth wave and inputs it into the PWM comparator. It is possible to change the oscillating frequency by means of the resistor RT. Due to RRT=120kΩ, the CH1 operates at 1MHz(typ.). The double charge pump, CH2 and CH3 operate at 1/2 of CH1 frequency. ・VREF Block Generate the constant voltage that is standard inside the IC. ・UVLO Block Performs the under voltage lockout by detecting the VBAT voltage with the UVLOSET terminal. The UVLO voltage can be set by an external resistor. ・Soft Start Block Due to sweep-starting of the standard voltage of the error amplifier at the time of start-up, the excess input current & output voltage is reduced. Moreover, only at the time of soft start, the CH2 is regarded as the resistance value of 150Ωtyp between VIN2B & C2P and the CH3 is regarded as the resistance value of 60Ωtyp between VIN3 & C3P therefore the input current is limited. ・Short-circuit protection of timer latch (SCP) block Monitors the INV1 terminal and the error amplifier outputs of CH2 & CH3, and turns off the drivers of CH1~CH3 if a short-circuit condition continues for more than a certain period of time. The timer latch time is counted by the CH1 internal switching pulse. The counting is started when a short-circuit condition begins, ant the drivers are turned off when 131,072 is reached. Example) if RRT=120kΩ, then 131072×(1/1[MHz])=131.072ms ・Thermal shutdown (TSD) block Detects abnormal heat generation of the IC, stops the switching operation of all Ch and prevents the IC from thermal overload. The detecting temperature is 175℃(typ), and the hysteresis is 10℃(typ). www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 7/16 2010.03 - Rev.A Technical Note BD9862MUV ●Timing Chart 1) When Starting VBAT VBATUVLO release VBATUVLO解除 22倍チャージポンプ times charge pump Start on 起動開始 CPOUT REGOUT Regulator レギュレータ Start on 起動開始 REGOUTUVLO REGOUTUVLO Relief 解除 Vo1 Soft start Vo1ソフトスタート close 終了 Vo1 CH1起動開始 CH1 Start on CH2 Start on CH2起動開始 Vo2 Vo3 CH3 Start on CH3起動開始 Vo3Vo3ソフトスタート Soft start 終了 close 全CH起動終了 All CH Start close Fig.20 2) Sample SCP Operation When CH1 is short Vo1 Output Short Circuit Vo1出力短絡 Vo1 INV1 0.7V SCP Capacitor SCPコンパレータ Output (internal) 出力（内部） SCP Timer SCPタイマー動作 operation SCP Latch SCPラッチ (Internal) （内部） Driver stop ドライバー停止 (CH2, CH3 stop too) （CH2,CH3も停止） Lx1 Normal operation 通常動作 MAX operation MAX Duty Duty動作 SCP Fig.21 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 8/16 2010.03 - Rev.A Technical Note BD9862MUV 3) Sample② SCP Operation When CH2 is Short Output short 出力短絡 Vo2 ERROR OUT2 (INTERNAL) ERROR OUT2(内部) 2V OS SLOP (INTERNAL) OSCCSLOPE(内部) Driver stop ドライバー停止 C2N SCP Capacitor SCPコンパレータ Output (Internal) 出力（内部） (CH1,CH3も停止） (CH1, CH3 stop too) SCP Timer operation SCPタイマー動作 SCP latch SCPラッチ (Internal) （内部） 通常動作 Normal operation MAX Duty動作 SCP MAX Duty operation ※Operates similarly at the time of CH3 short-circuit. Fig.22 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 9/16 2010.03 - Rev.A Technical Note BD9862MUV ●Method to select the application parts 1) Setting of output voltage The output voltage VOUT is set by dividing the resistance of the external resistor. CH1,CH2:VOUT=1+R2/R1 CH3:VOUT=-((R4/R3)+Voffset) R1: Feedback resistor (GND side), R2: Feedback resistor (VOUT side), R3: Feedback resistor (VREF side), R4: Feedback resistor (VOUT side) 2) Setting of the output inductor ― The maximum current ILpeak that flows in the inductor is calculated by the sum of the average current I L and the maximum value of ripple current ⊿IL. ― ILpeak = I L + ⊿IL. ― Generally ⊿IL. is set to about 30% of I L. ― The average current I L and the ripple current ⊿IL. are calculated according to the following formulas. Vin min Vout Vin V out ⊿ IL IL max I out max 2 f osc L Vout Vin min L: value of inductance fOSC: switching frequency Vinmax: maximum input voltage Vinmin: minimum input voltage Vout: set value of output voltage Please set in such a way thatILpeak (the rated value of inductor current) is not exceeded. If ILpeak exceeded, then the efficiency is lowered extremely and damage to the inductor is caused. Please set in such a way that a good margin is left because the inductance varies in value. 3) Setting of output capacitor The capacitance & ESR of the output capacitor is influenced a great deal by output voltage ripple. Moreover, PFM mode intentionally makes the switching intermittent, so the output voltage ripple becomes larger compared with PWM mode. Please use an appropriate capacitor according to the service condition. In addition, please be sure to connect a ceramic capacitor of 1µF to REGOUT terminal. It is assumed that this IC uses a multilayer ceramic capacitor. For small multilayer ceramic capacitors such as Size 1608 etc., its actual capacitance may be lower than its nominal one because of the voltage that is bypassed. Please check to confirm various characteristics such as DC bypass etc. before use. 4) Setting of flying capacitor Please set the capacitance of the flying capacitor of the start-up charge pump not to exceed 1/10 of the capacitance of the CPOUT output capacitor. If it is more than 1/10 of the capacitance, damage may be caused. 5) Setting of the input capacitor A bypass capacitor for input is necessary to the VBAT terminal. Due to input & output voltage, load and wiring pattern etc., the actual capacitance is different from the necessary one, so please carefully check to confirm. 6) Setting of CR for phase compensation The CR for phase compensation is varied due to the characteristics of the capacitor & inductor, which are used in the output part, the input & output voltage and the load current etc. The phase-compensation CR constant in a recommended circuit diagram is set according to the service conditions, but applications under other conditions than the various conditions mentioned will cause oscillation instability etc. Please contact our technical service department if any conditions are changed. 7) Setting of schottky diode in the output part Please use a schottky diode with an allowable current more than ILpeak for the output part. Furthermore, it is necessary that the maximum reverse voltage is more than output voltage. Generally speaking, more lower the forward voltage, the higher the efficiency. 8) Setting of UVLO voltage The VULO release voltage VUVLO can be set according to the following formula: VUVLO=1+R2/R1(R1=GND-side resistance R2=VBAT-side resistance) If you want to make the start-up of the IC to lag behind the rising edge of VBAT, connect a capacitor to the UVLOSET terminal and set the time constant. 9) Setting of oscillating frequency Oscillating frequency can be adjusted by a resistor connected to the RT terminal. The CH1 oscillating frequency fosc1 is determined by the formula shown below: -12 -8 fosc1=1/(8×10 ×RRT+4×10 ) The frequency calculated by the formula shown above is a theoretical value, so please refer to the above-mentioned reference data「RT resistance vs. CH1 switching frequency characteristic」for actual frequency. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 10/16 2010.03 - Rev.A Technical Note BD9862MUV ●Operating Guidelines ・PWM terminal At Low the PFM mode skips the pulse of less than 7% On Duty. It is also switched over to the PWM mode if a certain amount of load is reached or exceeded while in PFM mode. Moreover, it is switched to PFM mode if the load becomes light. Please set the PWM terminal to High and use as the forced PWM mode if there is an influence of noise created by modulation of the switching frequency. ・SCP Function In case of circuit stoppage due to SCP, the protection is released by setting the UVLOSET voltage to L and the VBATT to OFF. ・CH2 adding charge pump Please set the Vo2 so that the VIN2A+VIN2B become not more than 15V because the voltage that is the sum of the VIN2A voltage plus the VIN2B voltage is applied. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 11/16 2010.03 - Rev.A Technical Note BD9862MUV ●Sample of Recommended Circuit 1) Sample of Input voltage 1.8V~4.5V application Vin= 1.8~ 4.5V CflyS 0.22uF CN CPOUT CCPOUT 2.2uF CP VBAT Regulated Charge Pump L1 REGOUT VREG LX CREGOUT 2.2uF D1 COUT1 10uF step-up DC-DC VREF VREF 200kO PGND1 INV1 RT OSC FB1 300pF 1kO 680pF 22kO 12kO 120kO VIN2A VBAT or REGOUT VIN2B H:PWM L:PFM PWM ADD Charge Pump PWM or PFM Control C2P C2N Cfly2 0.047uF VO2 COUT2 2.2uF 2.2MO GND INV2 200kO Thermal Shut Down VIN3 X-1 Charge Pump Short Circuit Protection C3P Cfly3 0.047uF COUT3 2.2uF D3 Soft Start 91kO UVLOSET NON3 100kO 20kO UVLO 110kO PGND2 Fig.23 ・Recommended Parts L1 : NR4010T4R7M(TAIYO YUDEN) D1 : RB161VA-20(ROHM) D3 : DAN217U(ROHM) COUT1 : GRM31CB31C106KA88(MURATA) CIN : GRM219B30J106KE18(MURATA) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. CCPOUT CREGOUT COUT2, COUT3 Cflys Cfly2, Cfly3 12/16 : : : : : GRM188B30J225KE18(MURATA) GRM155B30J105KE18 (MURATA) GRM188B31C225KE14D(MURATA) GRM155B10J224KE01(MURATA) GRM155B11C473KA01(MURATA) 2010.03 - Rev.A Technical Note BD9862MUV 2) Sample of Input voltage 4.5V~5.5V application Vin= 4.5~ 5.5V CN CPOUT CP VBAT Regulated Charge Pump L1 REGOUT VREG LX CREGOUT 2.2uF D1 COUT1 10uF step-up DC-DC VREF VREF 200kO PGND1 INV1 RT OSC FB1 300pF 1kO 680pF 22kO 12kO 120kO VIN2A VBAT or REGOUT VIN2B H:PWM L:PFM PWM ADD Charge Pump PWM or PFM Control C2P C2N Cfly2 0.047uF VO2 COUT2 2.2uF 2.2MO GND INV2 200kO Thermal Shut Down VIN3 X-1 Charge Pump Short Circuit Protection C3P Cfly3 0.047uF COUT3 2.2uF D3 Soft Start 300kO UVLOSET NON3 100kO 20kO UVLO 100kO PGND2 Fig.24 ・Recommended Parts L1 : NR4010T4R7M(TAIYO YUDEN) D1 : RB161VA-20(ROHM) D3 : DAN217U(ROHM) COUT1 : GRM31CB31C106KA88(MURATA) CIN : GRM219B30J106KE18(MURATA) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. CCPOUT CREGOUT COUT2, COUT3 Cflys Cfly2, Cfly3 13/16 : : : : : GRM188B30J225KE18(MURATA) GRM155B30J105KE18(MURATA) GRM188B31C225KE14D(MURATA) GRM155B10J224KE01(MURATA) GRM155B11C473KA01(MURATA) 2010.03 - Rev.A Technical Note BD9862MUV ●Input / Output Equivalent Circuit LX INV1, INV2, NON3 FB1 UVLOSET REGOUT VBAT REGOUT LX INV1,2 NON3 FB1 CN CP, CPOUT UVLOSET REGOUT PWM CPOUT VBAT REGOUT CPOUT REGOUT CP PWM CN VBAT RT, VREF VIN2A, C2N VIN2B VO2, C2P VIN2A REGOUT Vo2 VIN2B C2N C2P RT,VREF VIN3, C3P VIN3 C3P Fig.25 Input / Output Equivalent Circuit ●Points for attention on PCB layout ①Place the resistors and capacitors, that are connected to RT, INV1, FB1, INV2, NON3 and VREF, close to the terminals to avoid being affected by the wirings, where switching is large, such as LX1 wiring and flying capacitor wiring etc. ②Place the inductor, schottky diode and flying capacitor close to the IC. ③Mount in such a way that the back side of the package serves as the GND potential which covers the largest space in the PCB. Heat dissipation performance is improved. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 14/16 2010.03 - Rev.A Technical Note BD9862MUV ●Notes for Use 1.) Absolute maximum ratings This is a high quality product, but if absolute maximum rating such as applied voltage and operating temperature range is exceeded, then deterioration or breakdown may result. Moreover, such destructive conditions as short mode or open mode can not be assumed. If a particular mode such as exceeding the absolute maximum rating is assumed, consideration should be given to using physical safety measures such as a fuse. 2.) CND Potential The electric potential of the GND pin should be the lowest electric potential under any operating state. In addition, (including transient phenomenon), do not make the electrical potential of any pin lower than the GND’s. 3.) Thermal design Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions. 4.) Inter-pin shorts and mounting errors Use caution when orienting and positioning the IC for mounting on printed circuit boards. Improper mounting may result in damage to the IC. In addition, shorts between output pins or between output pins and the power supply GND pin caused by the presence of a foreign object may result in damage to the IC. 5.) Operation in a 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. 6.) Common impedance Power supply and GND wiring should reflect consideration of the need to minimize ripples as much as possible., (which lower common impedance), by making wiring as short and thick as possible or incorporating inductance and capacitance. 7.) Thermal shutdown circuit (TSD circuit) This IC incorporates a built-in thermal shutdown circuit (TSD circuit). The TSD circuit is designed not for the purpose of protection & guarantee of the IC, but only to shut the IC off to prevent thermal overload. Therefore, do not use the IC on the premise that this TSD circuit will be operated to shut the IC off (or the IC will be continued to be used after this TSD circuit is operated to shut the IC off). 8.) IC pin input This monolithic IC contains the P+ isolation between adjacent elements in order to keep them isolated from the P substrate. Due to this P layer and the N layer of each element, the P/N junctions are formed and various kinds of elements are created. For example, if a resistor and a transistor are connected with pins as shown in the Fig., then: ○the P/N junction functions as a parasitic diode when GND > (Pin A) for the resistor or GND > (Pin B) for the transistor (NPN). ○Moreover, when GND > (Pin B) for the transistor (NPN), the parasitic NPN transistor is operated by N layer of other elements adjacent to the above-mentioned parasitic diode. The formation of parasitic elements as a result of the relationships of electric potentials is an inevitable result of the IC's architecture. The operation of parasitic elements can cause interference with the circuit operation as well as IC malfunction and damage. For these reasons, it is necessary to use caution so that the IC is not used in a way that will trigger the operation of parasitic elements, such as by the application of voltages lower than the GND (P substrate) voltage to input pins. Transistor (NPN) N N P P+ + P+ P N P Substrate B C N Parasitic Element GND P N N E P+ Parasitic Element N P Substrate Parasitic Element (Terminal A) ～ (Terminal B) (Terminal A) ～ Resistance GND GND Fig.26 Simple Structure of monolithic IC (Sample) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 15/16 2010.03 - Rev.A Technical Note BD9862MUV ●Ordering Part Number B D 9 Part No. 8 6 2 Part No. M 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 © 2010 ROHM Co., Ltd. All rights reserved. Reel 16/16 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2010.03 - 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, fuelcontroller 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 © 2010 ROHM Co., Ltd. All rights reserved. R1010A