System Power Supply for TV Series Built-in 1ch FET Light Load Type DC / DC converters No.09034EAT04 BD8622EFV ●Description BD8622EFV has realized the high performance and reliability required as a power supply for thin-screen TV. Due to the high-speed load response, it is most suitable for TV-purpose processors with increasingly high performance, and due to the wide phase margin it leaves a good margin for board pattern & constant setting and so facilitates its application design. As a high-reliability design, it has various built-in protection circuits (overcurrent protection, output voltage abnormal protection, thermal protection, and off-latch function at the time of abnormality etc.), therefore as an advantage it does not easily damage in every possible abnormal condition such as all-pin short circuit test etc. and hence most suitable for thin-screen TV which requires the high reliability. ●Features 1)High efficiency in all load area 2)3.0A output current 3)PWM mode/PFM mode switch(automatic operation) 4)Low current mode/Rorripplmord switch with terminal MODE 5)Low RDS(ON) internal switches:75mΩ(typ.) 6)±1% reference voltage accuracy 7)Programmable frequency : 250kHz-1MHz (Can the adjustment by an external synchronization and the terminal RT resistance.) 8)Terminal RT OPEN/SHORT detecting function 9)Over current protection function 10) Output over voltage/low voltage protection function (over : FB > VREF +60mV , low : FB < VREF -60mV) 11) Timer off latch function in abnormal circumstances 12) Thermal shutdown function 13) Under voltage protection 14) Soft start/start delay circuit 15) Soft start time out function 16) Protecting BUS function with terminal PDET 17) HTSSOP-B20 package www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1/15 2009.05 - Rev.A Technical Note BD8622EFV ●Electrical characteristics (Unless otherwise noted Ta=25℃, VIN=3.3V, GND=0V) Specification value UNIT Condition MIN TYP MAX VIN supply current (operating) IQ_active 210 350 μA VFB = 0.83V, VFC = 1V VIN supply current (standby) IQ_stby 0 1 μA VEN = 0V Reference voltage (VREF) VREF 0.792 0.8 0.808 V Output rise detection voltage VOVP 30 60 90 mV Monitoring FB terminal Output decrease detection voltage VLVP -90 -60 -30 mV Monitoring FB terminal Terminal PDET output current IPDET 0.4 mA VPDET< 0.3V Oscillation frequency fOSC 500 550 600 kHz RRT= 220kΩ Pch FET ON resistance RPFET 75 110 mΩ ISW = 1A UVLO voltage VUVLO 2.35 2.50 2.65 V SW leak current ILSW 0 1 μA VEN= 0V, VIN = 5.5V EN terminal H threshold voltage VENH 1.1 V EN terminal L threshold voltage VENL 0.4 V FC sink current IFCSI 10 20 μA FC source current IFCSO -20 -10 μA SS/DELAY terminal source current ISSSO 2 4 6 μA Terminal PDET pull-up resistor RPDET 100 170 250 kΩ VFB :FB terminal voltage, VEN :EN terminal voltage, VFC :FC terminal voltage, VPDET: PDET terminal voltage Current capability should not exceed Pd. Parameter www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Symbol 2/15 2009.05 - Rev.A Technical Note BD8622EFV ●Block diagram SGND 1 RT 20 OSC 0.8V FC FB 2 19 Err AMP PDET 3 NC SS/DELAY 18 Detect Abnormal Voltage and Start error MODE 17 4 SW Shut Down 5 enable PWM/PFM CONTROL SW EN en 16 NC 15 6 SW SVIN SVIN 14 7 Predrive SW VIN 8 13 NC VIN 12 9 VIN PGND 10 VIN 11 Fig1 Block diagram ●Pin Description No. 1 2 Symbol Description SGND Signal GND terminal Feed back terminal FB 3 PDET 4 5 6 7 8 9 10 11 12 13 14 15 16 NC SW SW SW SW NC PGND VIN VIN VIN VIN NC EN 17 MODE Explanation Small signal system GND Output voltage detection Abnormal state notification and external IC abnormality detection terminal Protecting BUS communication terminal Switching output terminal Power GND terminal GND for power MOSFET Power supply input terminal Power supply input. The decoupling is done to PGND Enable input ON/OFF control for device operation The operation mode is switched according to the input voltage at a light load. The soft start time is adjusted with the connected capacitor MODE selection terminal 18 SS/DELAY Soft start adjustment capacity connection terminal Error amplifier output Error amplifier phase compensation point 19 FC Frequency adjustment resistance connection terminal The switching frequency is set by the connected resistance 20 RT www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/15 2009.05 - Rev.A Technical Note BD8622EFV ●Pin equivalence circuit diagram No. Symbol Explanation 1 SGND 2 FB 3 PDET 5,6,7,8 SW 10 PGND Power GND (Same voltage as SGND) 11,12,13 PVIN Power supply input terminal 14 SVIN Power supply input terminal Terminal equivalent circuit diagram GND (connected 0V) Output voltage detection terminal Protecting BUS I/O terminal Output terminal www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 4/15 2009.05 - Rev.A Technical Note BD8622EFV No. Symbol 16 EN 17 MODE Explanation Terminal equivalent circuit diagram Enable terminal Operation mode switch terminal at light load www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 5/15 2009.05 - Rev.A Technical Note BD8622EFV No. Symbol Explanation 18 SS /DELAY Soft start time adjustment terminal 19 FC Error amplifier compensation terminal 20 RT Oscillator frequency adjustment terminal www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Terminal equivalent circuit diagram 6/15 2009.05 - Rev.A Technical Note BD8622EFV ●Operation description Enable control The device can be controlled ON/OFF by EN terminal (16 pin) voltage. An internal circuit starts when VEN reaches 1.1V. When standing up of VIN is too steep (1msec or less), a defective start might be caused according to the state of Pascon between GND substrate pattern and power supply-when the terminal EN is short-circuited to the terminal VIN and it is used. VEN EN terminal VENH VENL 0 VSS VSSCLM SS terminal VSSTH 0 VO Output setting voltage 0 tSS Fig.2 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. ON/OFF transition wave form in EN controlling 7/15 2009.05 - Rev.A Technical Note BD8622EFV Soft start time set function As for BD8622EFV, output can do soft start without overshoot by charging soft start capacity (CSS) connected between SS and SGND terminal. Also, soft start time (tss) can be set by setting soft start capacity (CSS) arbitrarily. OSC oscillation frequency setting function The output oscillation frequency can be set by connecting resistance between terminal RT (20 pins) and SGND (range = 250kHz - 1MHz) The relation between RT terminal resistance and the oscillation frequency follows Fig.4. Frequency [kHz] Frequency [kHz] 1000 10 10 100 1000 10000 RT terminal resistance [kΩ] Fig.4 RT resistance-oscillation frequency www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 8/15 2009.05 - Rev.A Technical Note BD8622EFV Light load mode operation ・Low current mode When the terminal MODE (17 pins) is made "H", low current mode operation becomes effective. The characteristic of the efficiency valuing is obtained in low current mode operation at a light load. VOUT [20mV/DIV] SW [2V/DIV] IL [200mA/DIV] Fig.5 Low current mode operation ・Low ripple mode When the terminal MODE is made "L", the Low ripple mode operation becomes effective. It becomes operation of valuing a low ripple in the Low ripple mode operation at a light load. VOUT [20mV/DIV] SW [2V/DIV] IL [200mA/DIV] Fig.6 Low ripplemord operation 100 90 Low current mode 80 Efficiency [%] 70 60 50 Low ripple mord 40 VIN=3.3V VO=1.8V 30 Io=0～100mA SW_f=550KHz(R11=220KΩ) 20 10 0 1 10 100 Negative overcurrent [mA] Fig7 Light load mode efficiency comparison www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 9/15 2009.05 - Rev.A Technical Note BD8622EFV ● Protection function Protection circuit is effective for destruction prevention due to accident so that avoid using under continuous protection operation. Low voltage protection function (LVP) The voltage of the terminal FB (2 pins) is compared with internal reference voltage VREF. If FB terminal voltage falls below VLVP(= VREF -60mV) and the state continues for 500us, output changes to low voltage and the state is fixed. In that case , PDET (3pin) output changes to L. Table 1 output low voltage protection function EN terminal >VENH <VENL SS terminal >1.4V(typ) <1.4V(typ) - Low voltage protection function FB terminal <VLVP >VLVP - Effective Invalidity Invalidity Low voltage protection operation ON OFF OFF OFF ＊ Low voltage protection function is available when SS terminal voltage becomes more than 1.4V (typ) in the transition to ON control (during soft start). Over voltage protection function(OVP) The voltage of the terminal FB is compared with internal reference voltage VREF. If FB terminal voltage is over Vovp (=VREF +60mV) and the state is continues for 500usec, output changes to low voltage and the state is fixed. EN terminal >VENH <VENL SS terminal >1.4V(typ) <1.4V(typ) - Table 2 output overvoltage protection function Over voltage FB terminal protection function >VOVP Effective <VOVP Invalidity Invalidity Over voltage protection operation ON OFF OFF OFF ＊ Over voltage protection function is available when SS terminal voltage becomes more than 1.4V (typ) in the transition to ON control (during soft start). VFB VREF＋60ｍV FB terminal voltage VREF VREF-60ｍV 0 Protection ON OFF LVP PDET terminal OVP LVP HIGH LOW Fig.8 Output voltage error detection range www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 10/15 2009.05 - Rev.A Technical Note BD8622EFV Under voltage lock out protection (UVLO) As for BD8622EFV, the power-supply voltage decrease detection protection circuit is built in. It the input voltage decrease below the UVLO voltage (2.5V typ), the device state changes to the standby mode (Moreover, to prevent the chattering of the output) hysteresis width of 100mV(typ) has been installed in the UVLO cancel voltage. RT terminal open/short protection function (RTO/RTS) RT terminal opening/short protection function prevent the clock from abnormal oscillation. If RT terminal open/short protection function is detected, output voltage changes to low level and is fixed. Terminal RT opening/short protection function is available if the state continue for 500usec, abnormal detection operates when the state continues about 500μsec(typ). Soft start time-out function If VSS doesn't exceed VSSTH within 64msec (typ) since a soft start began, BD8622EFV controls an off latch. Vo is fixed in a low level. VSSTH SS terminal 0V 64msec（ｔyp） Fig.9 Soft start time-out Thermal shut down function Thermal shut down circuit (TSD circuit) is built into BD8622EFV. When the temperature of the chip exceeds Tjmax=175, the DC/DC converter is fixed in a low voltage. TSD function is aimed to shut down IC from thermal reckless driving under an abnormal state to exceed Tjmax=175. It aims at neither protection nor the guarantee of the set. Therefore, please do not use this function to protect the set. Over current protection function The over current protection function has been achieved by limiting the current that flows on high side MOSFET. The current is controlled in every one cycle of the switching frequency. When an abnormal state continues for about 500μsec(typ), the output is fixed in a low level. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 11/15 2009.05 - Rev.A Technical Note BD8622EFV Protecting BUS function with terminal PDET The terminal PDET (3 pins) monitors whether IC is normal or not. When IC becomes abnormal, the PDET output is reduced at "L" level with the output voltage fixed “L” level at the same time. Moreover, it is possible to make the output fix in a low level by compulsorily reducing the terminal PDET at "L" level from the outside. When two or more BD8622EFV is used in the application, this function prevents the IC from destroying, because one IC error transmits all other ICs by PDET line in the condition that PDET terminals are connected each other. VIN 170kΩ VIN PDET PDET IC_A 170kΩ IC_B Fig.10 Protecting BUS communication ※Please give the terminal PDET as OPEN when you do not use protecting BUS function. Error detection (off latch) release method BD8622EFV enters the state of an off latch when the protection function operates. To release the off latch state, EN terminal voltage should be changed to low level once time. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 12/15 2009.05 - Rev.A Technical Note BD8622EFV ●Each characteristic reference data Vout : 100mV/div VIN = 5V Io = 3A Vout : 20mV/div Io = 1A/div 100usec/div 1usec/div Fig.11 Output load response 100 Fig.12 Output ripple VIN = 2V/div VIN = 3.3V 90 80 70 EFFICIENCY [%] 60 VOUT = 0.5V/div VIN = 5.0V 50 VOUT = 1.8V fosc = 550kHz LC mode 40 30 SS = 2V/div 20 10 0 1 10 100 1000 10000 10msec/div LOAD CURRENT [mA] Fig.13 Efficiency Fig.14 Soft start 2.0 VIN = 5.0V VOUT = 1.8V OUTPUT VOLTAGE : Vo [V] 1.9 1.8 1.7 1.6 1.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT [A] Fig.15 Regulation www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 13/15 2009.05 - Rev.A Technical Note BD8622EFV 5.0 ERROR AMP REFERENCE VOLTAGE : VREF [V] 0.810 0.808 VIN = 3.3V VIN = 3.3V SS CHARGE CURRENT : Iss [μA] 4.8 0.806 0.804 0.802 0.800 0.798 0.796 4.5 4.3 4.0 3.8 3.5 0.794 3.3 0.792 3.0 0.790 -25 -25 0 25 50 75 100 125 0 25 150 Fig.16 Reference voltage - Temperature characteristic 75 100 125 150 Fig.17 SS Charging current - Temperature characteristic 600.0 600.0 590.0 590.0 VIN = 3.3V Ta = 25℃ 580.0 FREQUENCY : Fosc [kHz] 580.0 570.0 FREQUENCY : Fosc [kHz] 50 AMBIENT TEMPERATURE : Ta [℃] AMBIENT TEMPERATURE : Ta [℃] 560.0 550.0 540.0 530.0 570.0 560.0 550.0 540.0 530.0 520.0 520.0 510.0 510.0 500.0 500.0 2.5 3 3.5 4 4.5 5 -25 5.5 0 25 50 75 100 125 150 AMBIENT TEMPERATURE : Ta [℃ ] INPUT VOLTAGE : Vin [V] Fig.18 Switching frequency-power-supply voltage Fig.19 Switching frequency-temperature characteristic 110.00 100.0 Ta = 25℃ 90.0 VIN = 3.3V 100.00 ON‐RESISTANCE: Ron [mΩ] ON‐RESISTANCE: Ron [mΩ] 80.0 70.0 60.0 50.0 40.0 30.0 90.00 80.00 70.00 60.00 50.00 20.0 40.00 10.0 30.00 0.0 2.5 3 3.5 4 4.5 5 -25 5.5 0 25 Fig.20 PMOS on resistance-power-supply voltage 75 100 125 150 Fig.21 PMOS on resistance-temperature characteristic 400.0 1.00 VIN = 3.3V 0.90 350.0 0.80 Ta = 25℃ 300.0 CIRCUIT CURRENT: Icc [uA] EN VOLTAGE HIGH: VENH [V] 50 AMBIENT TEMPERATURE : Ta [℃ ] INPUT VOLTAGE : Vin [V] 0.70 0.60 0.50 0.40 0.30 0.20 250.0 200.0 VFB = 0.83V VFC = 1.0V SW = H 150.0 100.0 50.0 0.10 0.0 0.00 -25 0 25 50 75 100 125 2.5 150 Fig.22 Terminal EN H voltage-temperature characteristic www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE : Vin [V] AMBIENT TEMPERATURE : Ta [℃ ] Fig.23 Circuit current-power-supply voltage characteristic 14/15 2009.05 - Rev.A Technical Note BD8622EFV ●Ordering part number B D 8 Part No 6 2 2 E Part No. F V - Package EFV: HTSSOP-B20 E 2 Packaging and forming specification E2: Embossed tape and reel HTSSOP-B20 <Dimension> <Tape and Reel information> 6.5 ± 0.1 11 6.4 ± 0.2 4.4 ± 0.1 0.5 ± 0.15 1.0 ± 0.2 20 1 10 Embossed carrier tape Quantity 2500pcs Direction of feed E2 (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) 0.17 +0.05 −0.03 S 0.08 S 1234 1234 1234 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1pin 1234 （Unit:mm) 1234 Reel 1234 0.2 +0.05 −0.04 1234 0.65 1234 1.0Max. 0.85 ± 0.05 0.08 ± 0.05 0.325 Tape Direction of feed ※When you order , please order in times the amount of package quantity. 15/15 2009.05 - 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. 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