BD90528EFJ-CE2

Datasheet Secondary power supply series for automotive 2.69 to 5.5V, Fixed Output, 2.25MHz Synchronous Step-Down Converter BD9052xEFJ-C Series ●General Description The BD9052xEFJ-C series is a synchronous rectification type step-down DC/DC converter with a 2.25MHz fixed frequency that operates in with an input voltage range of 2.69V-5.5V. It has an integrated feedback resistor that supplies a fixed output voltage of 1.2V/1.5V/1.8V and a phase compensation constant. Applications can be created with a minimum of three external components. Moreover, the integrated Pch and Nch output MOSFET can supply a maximum output current of 2A. ●Key Specifications ■ Input voltage range ■ Output voltage BD90522EFJ-C BD90525EFJ-C BD90528EFJ-C ■ Output voltage accuracy ■ Operating frequency ■ Maximum output current ■ Circuit current at standby ■ Operational temperature range ●Features ■ Integrated output feedback resistors and phase compensation network, contributes to minimize external components for the applications. ■ Excellent load response through current mode control ■ Integrated Pch and Nch output MOSFET ■ Integrated overcurrent protection with auto-reset ■ Integrated output overvoltage detection/ short-circuit detection ■ Integrated TSD and UVLO ■ Light load mode/PWM fixation operation selection pin ●Package HTSOP-J8 ●Applications ■ Automotive equipment ■ Car audio and navigation ■ TV ■ Other electronic equipment 1.2 [V](Typ.) 1.5 [V](Typ.) 1.8 [V](Typ.) ±2.0[%](-40～125°C) 2.25 [MHz] (Typ.) 2.0 [A] (Max.) 0[µA](Typ., 25°C) -40～+125°C 4.90 ㎜×6.00 ㎜×1.00 ㎜ 100 90 ●Typical application circuit Light Load MODE 80 1µF 22µF X4 EFFICIENCY [%] 70 1.0µH 10µF 2.69V～5.5[V] 60 PWM MODE 50 40 30 20 VIN=5V Figure 1 CIRCUIT 10 0 Figure 1. Typical application circuit (BD90525EFJ-C, VIN=5V, IOUT=2A) 0.01 0.10 1.00 LOAD CURRENT [A] 10.00 Figure 2. Efficiency (BD90525EFJ-C) ○Product structure：Silicon monolithic integrated circuit ○This product is not designed to be radiation resistant. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・14・001 1/1 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Pin Configuration [TOP VIEW] ●Pin Description Pin Symbol 1 PVIN （TOP VIEW） Function Power supply pin for output FET PVIN 1 8 SW 2 VIN Power supply pin VIN 2 7 PGND 3 EN Enable pin EN 3 6 FB 4 GND GND 4 5 MODE 5 MODE 6 FB 7 PGND 8 SW Figure 3. Pin arrangement diagram GND pin Light load mode/Fixed PWM mode select pin Output feedback pin GND pin for output FET SW pin ●Block diagram EN VIN VREF SOFT START UVLO PVIN PWM Comp ERROR Amp. R OCP SLOPE OSC SW Driver Logic S OVP PGND UVLO /TSD SCP 1024cycle OSC FB GND MODE Figure 4. Block diagram www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 2/2 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Block operation descriptions ■ Standby The circuit enters the state of standby when the EN pin is set to 0.7V or less. All the circuits, such as internal reference voltage VREF, oscillators OSC, and drivers are turned off during standby, and current consumption of the power supply becomes 0µA(25℃, Typ.). Via the FB pin, the output capacitor is discharged at a resistance of 1kΩ. ■ Start operation The circuit starts operating when EN pin is set to 2.1V or more. A soft start circuit (SOFT START) is integrated to prevent inrush current to the capacitor when starting. The output voltage reaches a set voltage with 1ms(Typ.) while following the startup of the soft start circuit. There is a delay of about 200µsec until the soft starts begins after the EN pin is turned on and the internal logic operation is started. In order to prevent a defective start, the short-circuit protection is not active during startup. ■ Error amplifier and phase compensation The voltage of the output feedback pin(FB) is compared with an internal reference voltage. The voltage corresponding to the difference will be generated, and sent to the PWM comparator which determines the duty ratio of the output. The feedback resistor which determines the output voltage, resistance for compensations, and the capacitor are integrated into the BD9052xEFJ-C series. ■ Oscillator The 2.25MHz(Typ.) internally fixed clock is generated and sent to the slope generation circuit (SLOPE) and to the driver. ■ Light load mode and Forced PWM mode BD9052xEFJ-C operates in the light load mode when the MODE pin is set to 0.7V or less. When the output load current is small, the switching operation automatically becomes intermittent in the light load mode. The efficiency at light load improves compared to the Forced PWM mode because the switching loss is suppressed by operating intermittently. The intermittently operating load current level changes depending on the input voltage, inductor value, etc. If the MODE pin is set to 2.1V or more, the chip operates in Forced PWM mode. In the Forced PWM mode, the efficiency at a light load decreases compared with the light load mode. However, because of the fixed frequency switching through the entire load range, noise is more easily countered. VOUT(10mV/div) VOUT(10mV/div) SW SW Figure 5. Switching operation at light load mode ■ Figure 6. Switching operation at PWM mode Overcurrent detection When in the output stage the current flowing to the Pch FET is 2.0A(Min.) or more, the Pch FET is turned off and the power supply to the output is intercepted. The overcurrent detection is operated every cycle, limits the switching duty, and returns at the next clock cycle. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 3/3 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ■ Output short-circuit detection The output short-circuit detection circuit (SCP) detects a short-circuit of the output when output voltage falls below 70% of a set value during 1024 cycles of the frequency. In this case, the Pch FET and Nch FET of the output are turned off, and the power supply is intercepted. The count is reset when the output voltage returns to 70% or more before 1024 cycles, and the output voltage returns to the set value. This SCP automatically resets when after 1024 cycles of the frequency after detecting the short-circuit, and switching is restarted. Resetting triggers the soft start operation because the internal soft start circuit is initialized when the short-circuit detection is activated. The short-circuit detection circuit is not active while soft start is starting. In case the short-circuit continues after resetting, the cycle of starting with a soft start, turning off the output after 1024 cycles, and returning after 1024 cycles is repeated. ■ Output overvoltage detection When the output overvoltage detection circuit (OVP) detects that the output voltage is exceeding 120% of a set value, the Pch FET and Nch FET of the output are turned off and the power supply is intercepted. Switching is restarted if after the power supply interception the output decreases and the overvoltage situation is released. The overvoltage detection voltage and the release voltage have a hysteresis of about 100mV. ■ UVLO The UVLO circuit is activated and shuts down the circuit when the input voltage (VIN) decreases to 2.6V or less. When the UVLO is activated, the control circuit of the error amplifier, the oscillator, the driver and the output are turned off. Via the FB pin, the output capacitor is discharged at a resistance of 1kΩ. Afterwards, UVLO is released when the input voltage VIN rises to 2.69V or more, and the output is restored. The output voltage starts with soft start when UVLO is reset. ■ Thermal shutdown(TSD) Thermal shutdown (TSD) is activated when the IC junction part temperature exceeds 175 ℃(Typ.). When the TSD is activated the control circuit of the error amplifier, the oscillator, the driver and the output are turned off. There is hysteresis in the detection temperature of TSD, which is reset when the junction temperature decreases to 150℃(Typ.) or less. The output voltage starts with soft start when TSD is reset. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 4/4 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Absolute maximum rating Parameter Symbol Rating Unit VIN -0.3～7 *1 V PVIN -0.3～7 *1 V EN voltage EN -0.3～7 V SW voltage SW -1.0～PVIN *1 V FB voltage FB -0.3～7 V MODE -0.3～7 V Pd 3.75 *2 W Operating temperature range Topr -40～+125 ℃ Storage temperature range Tstg -55～+150 ℃ Tj +150 ℃ VIN voltage PVIN voltage MODE voltage Power dissipation Junction temperature *1 Pd should not be exceeded. *2 33.3mW/°C reduction when Ta≧25°C if mounted on 4 layers glass epoxy board of 70mm×70mm×1.6mm ●Recommended operating range(Ta=-40～+125℃) Parameter Symbol Rating Unit VVIN 2.69～5.5 V VPVIN 2.69～5.5 V VEN 0～5.5(*1) V MODE voltage VMODE 0～5.5 V Output current ISW 0～2 A VIN voltage PVIN voltage EN voltage *1 The circuit goes into test mode when the EN pin is set at 6V or higher. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 5/5 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Electrical characteristics (unless otherwise specified: Ta=-40~+125°C, VIN=PVIN=5V, EN=3.3V) Parameter Symbol Ratings Min. Typ. Max. Unit Conditions Standby circuit current IST - 0 1 µA EN=0V, Ta=25℃ Circuit current ICC - 650 1300 µA FB=VFB+0.1V, Ta=25℃ UVLO detection voltage VUVLO1 2.30 2.45 2.60 V Sweep down UVLO release voltage VUVLO2 2.40 2.55 2.69 V Sweep up EN threshold voltage VEN 0.7 1.4 2.1 V EN inflow current IEN 0.2 0.7 1.2 µA FOSC 1.8 2.25 2.7 MHz Output voltage(BD90522EFJ-C) VFB 1.176 1.20 1.224 V Io=0mA Output voltage(BD90525EFJ-C) VFB 1.470 1.50 1.530 V Io=0mA Output voltage(BD90528EFJ-C) VFB 1.764 1.80 1.836 V Io=0mA FB pull-down resistance RFB 0.4 1 2 MΩ FB=VFB Soft start time TSS 0.4 1 2 ms Pch FET ON resistance PRON - 85 - mΩ Nch FET ON resistance NRON - 70 - mΩ Overcurrent detection current IOCP - 4.5 - A Typ. -0.15 Typ. -0.15 VFB ×1.2 VFB ×0.7 Typ. +0.15 Typ. +0.20 Operating frequency Output overvoltage detection voltage Output short-circuit detection voltage VOVP VSCP V V MODE threshold voltage VMODE 0.9 1.6 2.3 V MODE inflow current IMODE 3.5 7 14 µA www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 6/6 EN=3.3V MODE=3.3V TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Typical Performance Curve 100 100 Light Load MODE VIN=3.3V VIN=5V 80 80 70 70 60 PWM MODE 50 VIN=3.3V 40 VIN=5V 30 Light Load MODE VIN=3.3V VIN=5V 90 EFFICIENCY [%] EFFICIENCY [%] 90 60 PWM MODE 50 VIN=3.3V 40 VIN=5V 30 20 20 10 10 0 0.01 Figure 1. CIRCUIT 0 0.10 1.00 LOAD CURRENT [A] 0.01 10.00 Figure 7. Efficiency(BD90522EFJ-C) 2.0 STANDBY CIRCUIT CURRENT [uA] Light Load MODE VIN=3.3V VIN=5V 80 70 EFFICIENCY [%] 10.00 Figure 8. Efficiency(BD90525EFJ-C) 100 90 0.10 1.00 LOAD CURRENT [A] 60 PWM MODE 50 VIN=3.3V 40 VIN=5V 30 20 1.5 1.0 0.5 10 0.0 0 0.01 0.10 1.00 LOAD CURRENT [A] -40 10.00 0 20 40 60 80 TEMPERATURE [℃ ] 100 120 Figure 10. Standby circuit current Figure 9. Efficiency(BD90528EFJ-C) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 -20 7/7 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series 0.9 1.23 1.22 OUTPUT VOLTAGE [V] CIRCUIT CURRENT [mA] 0.8 0.7 0.6 0.5 1.21 1.20 1.19 1.18 1.17 0.4 -40 -20 0 20 40 60 80 TEMPERATURE [℃ ] 100 120 -40 0 20 40 60 80 TEMPERATURE [℃ ] 100 120 Figure 12. Output voltage vs. temperature (BD90522EFJ-C) Figure 11. Circuit Current 1.53 1.83 1.52 1.82 OUTPUT VOLTAGE [V] OUTPUT VOLTAGE [V] -20 1.51 1.50 1.49 1.48 1.81 1.80 1.79 1.78 1.47 1.77 -40 -20 0 20 40 60 80 TEMPERATURE [℃ ] 100 120 -40 0 20 40 60 80 TEMPERATURE [℃ ] 100 120 Figure 14. Output voltage vs. temperature (BD90528EFJ-C) Figure 13. Output voltage vs. temperature (BD90525EFJ-C) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 -20 8/8 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series 2.1 0.0 -0.1 EN THRESHOLD VOLTAGE [V] 1.9 ⊿OUTPUT VOLTAGE [%] -0.2 -0.3 -0.4 BD90525EFJ-C -0.5 BD90522EFJ-C -0.6 BD90528EFJ-C -0.7 -0.8 1.7 1.5 1.3 1.1 0.9 -0.9 0.7 -1.0 0.0 0.5 1.0 1.5 LOAD CURRENT [A] -40 2.0 -20 Figure 15. Load regulation 0 20 40 60 80 TEMPERATURE [℃] 100 120 Figure 16. EN threshold voltage 2.7 2.6 FREQUENCY [MHz] UVLO THRESHOLD VOLTAGE [V] 2.6 ON 2.5 OFF 2.4 2.4 2.2 2.0 2.3 1.8 -40 -20 0 20 40 60 80 TEMPERATURE [℃] 100 120 -40 Figure 17. UVLO detect/release voltage www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 -20 0 20 40 60 80 TEMPERATURE [℃] 100 120 Figure 18. Frequency vs. temperature 9/9 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series 90 2.6 80 ON RESISTANCE [mΩ] FREQUENCY [MHz] 70 2.4 2.2 2.0 Pch 60 50 Nch 40 30 20 10 1.8 0 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE VIN[V] 5.5 -40 Figure 19. Frequency vs. input voltage -20 0 20 40 60 80 TEMPERATURE [℃] 100 120 Figure 20. FET ON resistance 7.0 2.3 6.0 THRESHOLD VOLTAGE [V] OCP THRESHOLD CURRENT [A] OVP(BD90528EFJ-C) 2.1 5.0 4.0 3.0 1.9 OVP(BD90525EFJ-C) 1.7 1.5 OVP(BD90522EFJ-C) 1.3 SCP(BD90528EFJ-C) 1.1 SCP(BD90525EFJ-C) 0.9 SCP(BD90522EFJ-C) 0.7 2.0 -40 -20 0 20 40 60 80 TEMPERATURE [℃] -40 100 120 Figure 21. Over current detect vs. temperature www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 -20 0 20 40 60 80 TEMPERATURE [℃] 100 120 Figure 22. Output over/short detect voltage 10/10 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series The characteristics below are reference data which are measured with the typical application circuit as shown in Figure 1 Also, these characteristics are influenced by the external components and board layout. EN VOUT Figure 23. Loop response (BD90522EFJ-C, VIN=5V, IOUT=2A) Figure 24. Start-up waveform (BD90522EFJ-C, VIN=5V, MODE=3.3V) VOUT(50mV/div) VOUT(50mV/div) IOUT(1A/div) IOUT(1A/div) Figure 25. Load response (BD90522EFJ-C, VIN=5V, MODE=3.3V) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Figure 26. Load response (BD90522EFJ-C, VIN=5V, MODE=3.3V) 11/11 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Timing chart ■ Start-up Figure 27. Start-up ■ OCP Figure 28. OCP ■ SCP Figure 29. SCP www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 12/12 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Selection of external components ■ Selection of inductor The inductor value significantly influences the output ripple current. The larger the coil is, the more the ripple current drops will be as shown in the equation below. ΔIL = ΔIL （PVIN-VOUT）×VOUT L×PVIN×f [A] An inductor with a low value will cause the ripple current to increase and also causes an increase of the ripple element of the output voltage. The optimal output ripple current setting is between 10% ~ 30% of the maximum output current. ∆IL = 0.2×IOUTmax. [A] L= PVIN IL VOUT L （PVIN-VOUT）×VOUT ΔIL×PVIN×f Co [H] （∆IL: Output ripple current, f: switching frequency） Figure 30. Ripple . current Supplying the coil with a current exceeding the coil’s rated current will cause magnetic saturation of the coil and will decrease the efficiency of the coil. Please allow for a sufficient margin in selecting the inductor to ensure that the peak current does not exceed the inductor’s rated current. Please select a coil with a small resistance element (DCR, ACR) to reduce the coil loss, and to improve efficiency. ■ Selection of input capacitor The input capacitor serves to lower the impedance of the power supply connected to the input pin (VIN, PVIN). An increase of the impedance of this power supply can cause input voltage instability and may negatively impact oscillation and ripple rejection characteristics. Therefore, it is necessary to place an input capacitor in close proximity to the VIN, PVIN, GND and PGND pins. We recommend selecting a ceramic capacitor with a value of 10uF or more that influenced by changes in temperature as little as possible and that has a sufficiently large permissible ripple current. The ripple current RMS can be calculated using the following equation. IRMS = IOUT × VOUT（VIN - VOUT） [A] VIN Note that depending on the capacitor, the capacitance may be significantly influenced by the applied voltage. Please select a capacitor with good DC bias characteristics and with a high voltage. ■ Selection of output capacitor We recommend selecting a ceramic capacitor. The ripple element of the output voltage is determined by the ESR of the output capacitor. Please take the permissible voltage of the actual application into consideration when selecting the output capacitor. The ripple element of the output voltage can be calculated by using the equation below. Selecting a low-ESR capacitor can reduce the ripple element of the output voltage. Note that depending on the capacitor, the capacitance may be significantly influenced by the applied voltage. Please select a acapacitor with good DC bias characteristics and with a high voltage. ΔVPP = ΔIL × RESR + ΔIL Co × Vo VIN × 1 f [V] f: Switching frequency The startup time needs to be within the soft start time. Therefore, please take the following equation into consideration when selecting the output capacitor . TSS × (ILimit – IOUT) Tss: Soft start time (typ. 1ms) Co ≦ VOUT ILimit: Overcurrent detection value (min. 2A) Non-optimal capacitance values may cause startup problems. Especially in cases of extremely large capacitance values, the possibility exists that the inrush current at startup will activate the overcurrent protection, thus not starting the output. Therefore, verification and confirmation with the actual application is recommended. ■ Selection of Schottky diode Depending on the application the efficiency may be improved by placing a Schottky diode between the SW pin and PGND pin thereby creating a current path when the synchronous switching (Nch FET) is off. When selecting the Schottky diode ensure that the maximum reverse voltage is higher than the input voltage and that the rated current is higher than the maximum inductor current (the sum of the maximum output current and inductor ripple current). www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 13/13 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Notes on the substrate layout The substrate layout greatly influences the stable operation of the IC. Depending on the substrate layout the IC might not show its original characteristics or might not function properly. Please note the following points when drawing the substrate layout. ¾ The input capacitors C1 and C2 should be placed as close as possible to the VIN, PVIN, GND and PGND pins. ¾ The output voltage feedback line should be separated from lines with a lot of noise such as the SW line. ¾ The GND signal should be separated from the input capacitor and the GND and PGND of the output capacitor and brought together at one point. ¾ The output capacitors C3 and C4 should be placed in close proximity to inductor L1. ¾ The inductor L1 should be placed as close as possible to the SW pin. The pattern area of the SW node should be as small as possible. ¾ The MODE pin should be pulled down via R3 by GND and pulled up via R2 by VIN. It is also possible to directly supple the MODE pin with voltage. ¾ The feedback frequency characteristics (phase margin) can be measured by inserting a resistor at the location of R1 and using FRA. However, this should be shorted during normal operation. Figure 31. Reference circuit VIN GND VOUT C4 C3 R1 C1 L1 C2 IC R2 R3 Figure 32. Reference layout pattern www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 14/14 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Heat dissipation The maximum allowable junction temperature Tj of BD9052xEFJ-C series is 150°C. In case Tj exceeds 150℃, the temperature protection circuit is activated and the circuit shuts down. Therefore, it is necessary to design the system requirements and the board layout so that the junction temperature does not exceed 150℃ in the power-supply voltage, the output load and the operating temperature range. The maximum junction temperature can be calculated using the ambient temperature Ta, the thermal resistance θja of the package and heat dissipation P of the IC. Tj = Ta + θja × P [°C] The thermal resistance θja of the package changes depending on the number of layers and the copper foil area of the board. The heat dissipation PTOTAL of the IC can be calculated by the equation below. PTOTAL = PICC + PRON + PSW [W] PICC = VIN × ICC ・・・ Heat dissipation in control circuit PRON = Ron × Io2 ・・・ Heat dissipation in output FET PSW = Tr × Io × VIN × F ・・・ Heat dissipation in switching ICC: circuit current Ron: ON resistance of the output FET F: frequency All values are specified in the electrical characteristics. Tr is the rise time and fall time at switching. In the standard case is 5nsec and in the max case is 10nsec. Also, these characteristics are influenced by the external components and board layout. ●Thermal derating characteristic 4 ① 3.75W ② 2.11W ③ 1.10W ④ 0.50W IC mounted on ROHM standard board ・Board size：70mm×70mm×1.6mm ・The board and the back exposure heat radiation board part of package are connected with solder. POWER DISSIPATION: Pd （W) 3.5 3 ① IC unit, θja=249.5℃/W ② 2 layers board (Copper foil：15mm×15mm), θja =113.6℃/W ③ 2 layers board (Copper foil：70mm×70mm), θja =59.2℃/W ④ 4 layers board (Copper foil：70mm×70mm), θja =33.3℃/W 2.5 2 1.5 1 0.5 0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE: Ta(℃ ) Figure 33. Thermal derating characteristic www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 15/15 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●I/O equivalence circuit 3PIN (EN) 5PIN (MODE) 6PIN (FB) 8PIN (SW) www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 16/16 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Operational Notes 1. Absolute maximum ratings Exceeding the absolute maximum rating for supply voltage, operating temperature or other parameters may result in damages to or destruction of the chip. In this event it also becomes impossible to determine the cause of the damage (e.g. short circuit, open circuit, etc.). Therefore, if any special mode is being considered with values expected to exceed the absolute maximum ratings, implementing physical safety measures, such as adding fuses, should be considered. 2. Thermal protection circuit (TSD) If the junction temperature (Tj) exceeds 175℃(Typ.) the thermal protection circuit (TSD) is activated and the output is put in the OFF status. The releasing temperature has hysteresis of about 25°C(typ.). The thermal protection circuit only functions to block thermal overloads from reaching the IC. Its purpose is not to protect the circuit or to guarantee the operations of the IC. Therefore, the IC should not be continuously operated after this circuit has been activated, nor should the IC be used in applications where the activation of this circuit is a prerequisite. 3. Overcurrent protection circuit This IC incorporates an integrated overcurrent protection circuit that operates in accordance with the rated output capacity. This circuit serves to protect the IC from damage when the load becomes shorted. The protection circuit is effective in preventing damage due to sudden and unexpected accidents. However, the IC should not be used in applications characterized by the continuous or transitive operation of the protection circuit. 4. High temperature, no load behavior In a situation where there is a high temperature and no load, it might be that the leak current of the output transistor causes output voltage to rise (up to maximum VIN). It case it is expected that in the application conditions the output load drops below 1mA, please place a 1kΩ resistor at the output in order to prevent an no-load situation. 5. Power dissipation, ASO Should by any chance the power dissipation rating be exceeded, the rise in temperature of the chip may result in deterioration of the properties of the chip and lead to a decrease of the reliability. Therefore, allow for sufficient margins to ensure use within the power dissipation rating. Also, please ensure in the design that the absolute maximum rating of the output transistor and the ASO are not exceeded when operating the IC. 6. Operation in strong electromagnetic fields Use caution when operating in the presence of strong electromagnetic fields, as this may cause the IC to malfunction. 7. Connection to the power supply connector A reverse connection to the power supply connector may cause damages to the IC. In order to prevent against reverse connection damages please externally place a diode between the power supply and the power supply pin of the IC. 8. 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. Shorts between output pins or between output pins and the power supply or GND pins (caused by poor soldering or foreign objects) may result in damage to the IC. 9. Short to power supply, short to ground, inter-pin shorts Please avoid shorts between the output pin and the power supply (VIN, PVIN), shorts between the output pin and ground (GND, PGND) and shorts between the output pins. 10. Testing on application boards When testing the IC on an application board, connecting a capacitor directly to a low-impedance pin may subject the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply should always be turned off completely before connecting or removing it from a jig or fixture during the evaluation process. To prevent damage from static discharge, ground the IC during assembly and use similar precautions during transport and storage. 11. GND potential The potential of the GND pin must be the minimum potential in the system in all operating conditions. Ensure that no pins are at a voltage below the GND at any time, regardless of transient characteristics. 12. Wiring of VIN and GND For the wiring of VIN, PVIN, GND and PGND please create a layout with as wide as possible wires and a minimum distance in between the wires. In case of both small signal lines and high current lines, use single-point grounding to separate the small-signal and high current patterns and to ensure that voltage changes stemming from the wiring resistance and high current do not cause any voltage change in the small-signal. Also place a capacitor at the grounding point for stabilization. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 17/17 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series 13. Capacitor between PVIN and PGND The capacitor between PVIN and PGND absorbs the steep changes in voltage and current caused by the PWM drive and thereby suppress fluctuations in the PVIN voltage. However, this effect is diminished due to wiring impedance the further the capacitor is removed from the IC. 14. Input pins 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 P layers with the N layers of other elements, creating a parasitic diode or transistor. Relations between each potential may form as shown in the example below, where a resistor and transistor are connected to a pin: • With the resistor, when GND＞ Pin A, and with the transistor (NPN), when GND＞Pin B: The P-N junction operates as a parasitic diode. • With the transistor (NPN), when GND＞ Pin B: The P-N junction operates as a parasitic transistor by interacting with the N layers of elements in proximity to the parasitic diode described above. Parasitic diodes inevitably occur in the structure of the IC. Their operation can result in mutual interference between circuits and can cause malfunctions and, in turn, physical damage to or destruction of the chip. Therefore do not employ any method in which parasitic diodes can operate such as applying a voltage to an input pin that is lower than the (P substrate) GND. Transistor (NPN) B Resistor (Pin A) (Pin B) C (Pin B) E B C E P P+ N P+ P+ P+ N N P N Parasitic element GND GND P N N Parasitic element or transistor N P sub (Pin A) Parasitic element or transistor GND Parasitic element Figure 34. Example of IC structure 15. Application current and constants The application circuit as shown in Figure 1. and the constants are examples to show the standard operation and application of this IC. In case of creating a design for mass production with different external components please contact ROHM for detailed information. 16. In some applications, the PVIN pin and SW pin potential might be reversed, possibly resulting in circuit internal damage or damage to the elements. For example, while the external capacitor is charged, the PVIN shorts to the GND. To prevent this we recommend reverse polarity diodes in series or placing a bypass diode between the SW pin and PVIN pin. Bypass diode Reverse polarity  diode PVIN Pin Figure 35. Measure for reverse Note concerning this document The Japanese version of this document is the official specification. This translation should be seen as a reference to aid reading the official specification. In case of any discrapencies between the two versions, the offical version always takes precedence. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 18/18 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Ordering Information B D 9 0 5 2 x Output Voltage 2: 1.2V 5: 1.5V 8: 1.8V E F J - CE2 Package EFJ: HTSOP-J8 Packaging and forming specification CE2: Embossed tape and reel ●Physical Dimension Tape and Reel Information HTSOP-J8 +6° 4° −4° (2.4) 3.9±0.1 6.0±0.2 8 7 6 5 1 1.05±0.2 (3.2) 0.65±0.15 4.9±0.1 (MAX 5.25 include BURR) Tape 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 ) 2 3 4 1PIN MARK +0.05 0.17 -0.03 1.0MAX 0.545 S 0.08±0.08 0.85±0.05 1.27 +0.05 0.42 -0.04 0.08 M 0.08 S Direction of feed 1pin (Unit : mm) Reel ∗ Order quantity needs to be multiple of the minimum quantity. ●Marking Diagram HTSOP-J8(TOP VIEW) Part Number Marking LOT Number Output Voltage Product Name Marking 1.2V D90522 1.5V D90525 1.8V D90528 1PIN MARK www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 19/19 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet BD9052xEFJ-C Series ●Revision History Rev. Date 001 2012/12/17 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Notes New release 20/20 TSZ02201-0T1T0AL00050-1-2 17.DEC.2012 Rev.001 Datasheet ご注意 ローム製品取扱い上の注意事項 1. 極めて高度な信頼性が要求され、その故障や誤動作が人の生命、身体への危険若しくは損害、又はその他の重大な損害 (Note 1) 、航空宇宙機器、原子力制御装置等）（以下「特定用途」という） の発生に関わるような機器又は装置（医療機器 への本製品のご使用を検討される際は事前にローム営業窓口までご相談くださいますようお願い致します。ロームの文 書による事前の承諾を得ることなく、特定用途に本製品を使用したことによりお客様又は第三者に生じた損害等に関し、 ロームは一切その責任を負いません。 (Note 1) 特定用途となる医療機器分類 日本 USA EU CLASSⅢ CLASSⅡb CLASSⅢ CLASSⅣ CLASSⅢ 中国 Ⅲ類 2. 半導体製品は一定の確率で誤動作や故障が生じる場合があります。万が一、かかる誤動作や故障が生じた場合で あっても、本製品の不具合により、人の生命、身体、財産への危険又は損害が生じないように、お客様の責任において 次の例に示すようなフェールセーフ設計など安全対策をお願い致します。 ①保護回路及び保護装置を設けてシステムとしての安全性を確保する。 ②冗長回路等を設けて単一故障では危険が生じないようにシステムとしての安全を確保する。 3. 本製品は、下記に例示するような特殊環境での使用を配慮した設計はなされておりません。従いまして、下記のような 特殊環境での本製品のご使用に関し、ロームは一切その責任を負いません。本製品を下記のような特殊環境でご使用さ れる際は、お客様におかれまして十分に性能、信頼性等をご確認ください。 ①水・油・薬液・有機溶剤等の液体中でのご使用 ②直射日光・屋外暴露、塵埃中でのご使用 ③潮風、Cl2、H2S、NH3、SO2、NO2 等の腐食性ガスの多い場所でのご使用 ④静電気や電磁波の強い環境でのご使用 ⑤発熱部品に近接した取付け及び当製品に近接してビニール配線等、可燃物を配置する場合。 ⑥本製品を樹脂等で封止、コーティングしてのご使用。 ⑦はんだ付けの後に洗浄を行わない場合(無洗浄タイプのフラックスを使用された場合も、残渣の洗浄は確実に 行うことをお薦め致します)、又ははんだ付け後のフラックス洗浄に水又は水溶性洗浄剤をご使用の場合。 ⑧結露するような場所でのご使用。 4. 本製品は耐放射線設計はなされておりません。 5. 本製品単体品の評価では予測できない症状・事態を確認するためにも、本製品のご使用にあたってはお客様製品に 実装された状態での評価及び確認をお願い致します。 6. パルス等の過渡的な負荷（短時間での大きな負荷）が加わる場合は、お客様製品に本製品を実装した状態で必ず その評価及び確認の実施をお願い致します。また、定常時での負荷条件において定格電力以上の負荷を印加されますと、 本製品の性能又は信頼性が損なわれるおそれがあるため必ず定格電力以下でご使用ください。 7. 許容損失(Pd)は周囲温度(Ta)に合わせてディレーティングしてください。また、密閉された環境下でご使用の場合は、 必ず温度測定を行い、ディレーティングカーブ範囲内であることをご確認ください。 8. 使用温度は納入仕様書に記載の温度範囲内であることをご確認ください。 9. 本資料の記載内容を逸脱して本製品をご使用されたことによって生じた不具合、故障及び事故に関し、ロームは 一切その責任を負いません。 実装及び基板設計上の注意事項 1. ハロゲン系（塩素系、臭素系等）の活性度の高いフラックスを使用する場合、フラックスの残渣により本製品の性能 又は信頼性への影響が考えられますので、事前にお客様にてご確認ください。 2. はんだ付けは、リフローはんだを原則とさせて頂きます。なお、フロー方法でのご使用につきましては別途ロームまで お問い合わせください。 詳細な実装及び基板設計上の注意事項につきましては別途、ロームの実装仕様書をご確認ください。 Notice - SS © 2014 ROHM Co., Ltd. All rights reserved. Rev.002 Datasheet 応用回路、外付け回路等に関する注意事項 1. 本製品の外付け回路定数を変更してご使用になる際は静特性のみならず、過渡特性も含め外付け部品及び本製品の バラツキ等を考慮して十分なマージンをみて決定してください。 2. 本資料に記載された応用回路例やその定数などの情報は、本製品の標準的な動作や使い方を説明するためのもので、 実際に使用する機器での動作を保証するものではありません。従いまして、お客様の機器の設計において、回路や その定数及びこれらに関連する情報を使用する場合には、外部諸条件を考慮し、お客様の判断と責任において行って ください。これらの使用に起因しお客様又は第三者に生じた損害に関し、ロームは一切その責任を負いません。 静電気に対する注意事項 本製品は静電気に対して敏感な製品であり、静電放電等により破壊することがあります。取り扱い時や工程での実装時、 保管時において静電気対策を実施の上、絶対最大定格以上の過電圧等が印加されないようにご使用ください。特に乾燥 環境下では静電気が発生しやすくなるため、十分な静電対策を実施ください。 （人体及び設備のアース、帯電物からの 隔離、イオナイザの設置、摩擦防止、温湿度管理、はんだごてのこて先のアース等） 保管・運搬上の注意事項 1. 本製品を下記の環境又は条件で保管されますと性能劣化やはんだ付け性等の性能に影響を与えるおそれがあります のでこのような環境及び条件での保管は避けてください。 ①潮風、Cl2、H2S、NH3、SO2、NO2 等の腐食性ガスの多い場所での保管 ②推奨温度、湿度以外での保管 ③直射日光や結露する場所での保管 ④強い静電気が発生している場所での保管 2. ロームの推奨保管条件下におきましても、推奨保管期限を経過した製品は、はんだ付け性に影響を与える可能性が あります。推奨保管期限を経過した製品は、はんだ付け性を確認した上でご使用頂くことを推奨します。 3. 本製品の運搬、保管の際は梱包箱を正しい向き（梱包箱に表示されている天面方向）で取り扱いください。天面方向が 遵守されずに梱包箱を落下させた場合、製品端子に過度なストレスが印加され、端子曲がり等の不具合が発生する 危険があります。 4. 防湿梱包を開封した後は、規定時間内にご使用ください。規定時間を経過した場合はベーク処置を行った上でご使用 ください。 製品ラベルに関する注意事項 本製品に貼付されている製品ラベルに QR コードが印字されていますが、QR コードはロームの社内管理のみを目的と したものです。 製品廃棄上の注意事項 本製品を廃棄する際は、専門の産業廃棄物処理業者にて、適切な処置をしてください。 外国為替及び外国貿易法に関する注意事項 本製品は外国為替及び外国貿易法に定める規制貨物等に該当するおそれがありますので輸出する場合には、ロームに お問い合わせください。 知的財産権に関する注意事項 1. 本資料に記載された本製品に関する応用回路例、情報及び諸データは、あくまでも一例を示すものであり、これらに 関する第三者の知的財産権及びその他の権利について権利侵害がないことを保証するものではありません。従いまして、 上記第三者の知的財産権侵害の責任、及び本製品の使用により発生するその他の責任に関し、ロームは一切その責任を 負いません。 2. ロームは、本製品又は本資料に記載された情報について、ローム若しくは第三者が所有又は管理している知的財産権 その他の権利の実施又は利用を、明示的にも黙示的にも、お客様に許諾するものではありません。 その他の注意事項 1. 本資料の全部又は一部をロームの文書による事前の承諾を得ることなく転載又は複製することを固くお断り致します。 2. 本製品をロームの文書による事前の承諾を得ることなく、分解、改造、改変、複製等しないでください。 3. 本製品又は本資料に記載された技術情報を、大量破壊兵器の開発等の目的、軍事利用、あるいはその他軍事用途目的で 使用しないでください。 4. 本資料に記載されている社名及び製品名等の固有名詞は、ローム、ローム関係会社若しくは第三者の商標又は登録商標 です。 Notice - SS © 2014 ROHM Co., Ltd. All rights reserved. Rev.002 Datasheet 一般的な注意事項 1. 本製品をご使用になる前に、本資料をよく読み、その内容を十分に理解されるようお願い致します。本資料に記載 される注意事項に反して本製品をご使用されたことによって生じた不具合、故障及び事故に関し、ロームは一切 その責任を負いませんのでご注意願います。 2. 本資料に記載の内容は、本資料発行時点のものであり、予告なく変更することがあります。本製品のご購入及び ご使用に際しては、事前にローム営業窓口で最新の情報をご確認ください。 3. ロームは本資料に記載されている情報は誤りがないことを保証するものではありません。万が一、本資料に記載された 情報の誤りによりお客様又は第三者に損害が生じた場合においても、ロームは一切その責任を負いません。 Notice – WE © 2014 ROHM Co., Ltd. All rights reserved. Rev.001