Power Management Switch IC Series for PCs and Digital Consumer Product Large Current Output Power Management Switch ICs BD6520F,BD6522F No.09029EAT12 Description The power switch for expansion module is a power management switch having one circuit of N-channel Power MOS FET. The switch realizes 50mΩ(Typ.) ON resistance. The switch turns on smoothly by the built-in charge pump, therefore, it is possible to reduce inrush current at switch on. And soft start control by external capacitor is available. Further, it has a discharge circuit that discharges electric charge from capacitive load at switch off, Under voltage lockout circuit, and a thermal shutdown circuit. Features 1) Low on resistance (50mΩ, Typ.) N-MOS switch built in 2) Maximum output current: 2A 3) Discharge circuit built in 4) Soft start control circuit built in 5) Under voltage lockout (UVLO) circuit built in 6) Thermal shutdown (Output off latching) 7) Reverse current flow blocking at switch off (only BD6522F) Applications Notebook PC, PC peripheral device, etc. Lineup Parameter Supply Voltage Switch current On Resistance OUT Rise Time OUT Fall Time Package Reverse current flow blocking at switch off Absolute Maximum Ratings Parameter Supply Voltage CTRL Input Voltage *1 * * BD6520F 3 to 5.5V 2A 50mΩ 2000us 3us SOP8 - Symbol VDD VCTRL BD6522F 3 to 5.5V 2A 50mΩ 1000us 4us SOP8 ○ Switch Output Voltage VOUT Storage temperature Power dissipation TSTG Pd Rating -0.3 to 6.0 -0.3 to 6.0 -0.3 to VDD + 0.3 (BD6520F) -0.3 to 6.0 (BD6522F) -55 to 150 560*1 Symbol VDD IOUT TOPR Limit 3.0 to 5.5 0 to 2 -25 to 85 Unit V V V V ℃ mW Unit V A ℃ This value decreases 4.48mW/℃ above Ta=25℃ Resistance radiation design is not doing. Operation is not guaranteed. Operation conditions Parameter Supply Voltage Switch current Operating Temperature www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F Electrical characteristics ◎BD6520F(Unless otherwise specified, Ta = 25℃, VDD = 5V) Limit Parameter Symbol Min. Typ. RON1 50 On Resistance RON2 60 IDD 110 Operating Current IDDST VCTRLL Control Input voltage VCTRLH 2.5 - Max. 70 85 220 2 0.7 - Unit Condition mΩ mΩ uA uA V V VDD = 5V, VCTRL = 5V VDD = 3V, VCTRL = 3V VCTRL = 5V, OUT = OPEN VCTRL = 0V, OUT = OPEN VCTRL L = Low Level VCTRL H = High Level Control Input current ICTRL -1 0 1 uA VCTRL = L, H Turn On Delay Trd 200 1000 2000 us RL = 10Ω,SSCTL = OPEN CTRL = L→H → OUT=50% Turn On Rise Time Tr 500 2000 7500 us RL = 10Ω,SSCTL = OPEN CTRL = 10% → 90% Turn Off Delay Tfd - 3 20 us RL = 10Ω,SSCTL = OPEN CTRL = H→L → OUT=50% Turn Off Fall Time Tf - 1 20 us RL = 10Ω,SSCTL = OPEN CTRL = 90% → 10% Discharge Resistance RSWDC - 350 600 Ω VDD = 5V, VCTRL = 0V, VOUT = 5V UVLO Threshold Voltage VUVLOH VUVLOL 2.3 2.1 2.5 2.3 2.7 2.5 V V VDD increasing VDD decreasing UVLO Hysteresis Voltage VHYS 100 200 300 mV VHYS = VUVLOH - VUVLOL Thermal Shutdown Threshold TTS - 135 - ℃ VCTRL = 5V VSSCTL - 13.5 - V VCTRL = 5V SSCTL Output Voltage ◎BD6522F(Unless otherwise specified, Ta = 25℃, VDD = 5V) Limit Parameter Symbol Min. Typ. RON1 50 On Resistance RON2 60 110 IDD Operating Current IDDST VCTRLL Control Input Voltage VCTRLH 2.5 - Max. 70 85 220 2 0.7 - Unit Condition mΩ mΩ uA uA V V VDD = 5V, VCTRL = 5V VDD = 3.3V, VCTRL = 3.3V VCTRL = 5V, OUT = OPEN VCTRL = 0V, OUT = OPEN VCTRLL = Low Level VCTRLH = High Level Control Input Current ICTRL -1 0 1 uA VCTRL = L, H Turn On Time TON - 1000 3500 us RL = 10Ω,SSCTL = OPEN CTRL = H → OUT =90% Turn Off Time TOFF - 4 20 us RL = 10Ω,SSCTL = OPEN CTRL = L → OUT = 10% Discharge Resistance RSWDC - 350 600 Ω VDD = 5V,VCTRL = 0V UVLO Threshold Voltage VUVLOH VUVLOL 2.3 2.1 2.5 2.3 2.7 2.5 V V VDD increasing VDD decreasing UVLO Hysteresis Voltage VHYS 100 200 300 mV VHYS = VUVLOH - VUVLOL Thermal Shutdown Threshold TTS - 135 - ℃ VCTRL = 5V VSSCTL - 13.5 - V VCTRL = 5V SSCTL Output Voltage www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 2/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F Measurement circuit ◎BD6520F ◎BD6522F VDD VDD BD6520F VDDA OUTA VDDA OUTA VDDB OUTB VDDB OUTB SSCTL OUTC SSCTL DISC CTRL CSS BD6522F VSS RL CL IOUT VCTRL CTRL CSS RL CL VSS IOUT VCTRL Fig.1 Measurement circuit Timing diagram ◎BD6522F ◎BD6520F Tf Tr 90% VOUT 90% 50% 10% 50% 10% Trd VCTRLH 10% Tfd TOFF TON VCTRL 90% VOUT TON VCTRL VCTRLL VCTRLH TOFF VCTRLL Fig.2 Timing diagram www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F Typical characteristics ◎BD6520F 60 50 40 30 20 10 3 4 5 50 40 VDD=3.0V 30 VDD=3.3V 20 VDD=5.0V, 5.5V 10 6 80 60 40 20 0 -40 -20 0 20 40 60 80 2 100 4 5 6 AMBITENT TEMPERATURE : Ta [℃] SUPPLY VOLTAGE : VDD [V] Fig.3 On resistance Fig.4 On resistance Fig.5 Operating current (CTRL enable) 1.0 0.10 100 80 60 40 20 Ta = 25℃ VDD = 5.0V LEAK CURRENT : ILEAK [uA] OPERATING CURRENT : IDDST [uA] VDD = 5.0V 0.08 0.06 0.04 0.02 0.00 0 -40 3 SUPPLY VOLTAGE : VDD [V] 120 -20 0 20 40 60 80 0.6 0.4 0.2 0.0 2 100 0.8 3 4 5 6 0 20 40 60 80 100 AMBIENT TEMPERATURE : Ta [℃] SUPPLY VOLTAGE : VDD [V] AMBIENT TEMPERATURE : Ta [℃] Fig.6 Operating current (CTRL enable) Fig.7 Operating current (CTRL disenable) Fig.8 Leak current 2.5 CTRL INPUT VOLTAGE : VCTRL [V] Ta = 25℃ 2.0 Low to High 1.5 High to Low 1.0 0.5 2.5 VDD = 5.0V CTRL INPUT VOLTAGE : VCTRL [V] 2.5 2.0 1.5 1.0 0.5 0.0 0.0 2 3 4 5 1.5 1.0 0.5 0.0 -40 6 VDD = 5.0V 2.0 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 SUPPLY VOLTAGE : VDD [V] AMBIENT TEMPERATURE : Ta [℃] AMBIENT TEMPERATURE : Ta [℃] Fig.9 CTRL input voltage Fig.10 CTRL input voltage H→L Fig.11 CTRL input voltage L→H 0.4 5 0.4 CTRL HYSTERESIS : VCTRLHYS [V] Ta = 25℃ 0.3 0.2 0.1 0 Ta = 25℃ VDD = 5.0V TURN ON TIME :Ton [ms] OPERATING CURRENT : IDD [uA] 60 Ta = 25℃ 100 0 2 CTRL INPUT VOLTAGE : VCTRL [V] 70 OPERATING CURRENT : IDD [uA] 70 ON RESISTANCE : Ron [mΩ] ON RESISTANCE : Ron [mΩ] Ta = 25℃ 0 CTRL HYSTERESIS : VCTRLHYS[V] 120 80 80 0.3 0.2 0.1 3 4 5 6 Ton 3 Tr 2 Trd 1 0 0 2 4 -40 -20 0 20 40 60 80 100 2 3 4 5 SUPPLY VOLTAGE : VDD[V] AMBIENT TEMPERATURE : Ta [℃] SUPPLY VOLTAGE : VDD [V] Fig.12 CTRL hysteresis voltage Fig.13 CTRL hysteresis voltage Fig.14 Turn On Rise time www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 4/16 6 2009.05 - Rev.A Technical Note BD6520F,BD6522F 5 7 7 Ta = 25℃ 4 3 Ton 2 Tr Trd 1 Tfd 4 3 Tf 2 1 -20 0 20 40 60 80 4 Tfd 3 2 Tf 1 3 4 5 6 -40 -20 0 20 40 60 80 SUPPLY VOLTAGE : VDD [V] AMBIENT TEMPERATURE : Ta [℃] Fig.15 Turn On Rise time Fig.16 Turn Off Fall time Fig.17 Turn Off Fall time DISCHARGE RESISTANCE : RSWDC [Ω] Ta = 25℃ 400 300 200 100 0 2 3 4 5 500 VDD = 5.0V 400 300 200 100 0 -40 6 -20 0 20 40 60 80 VDD increasing 2.4 VDD decreasing 2.2 -40 20 40 60 80 10 10 100 1000 10000 Css [pF] AMBIENT TEMPERATURE : Ta [℃] Fig.21 UVLO hysteresis voltage 60 80 100 10 1 1 100 40 VDD = 5.0V, Ta = 25℃, RL = 10Ω 1 0 20 100 TURN OFF TIME : Toff [us] TURN ON TIME : Ton [ms] 0.1 0 Fig.20 UVLO threshold voltage VDD = 5.0V, Ta = 25℃, RL = 10Ω 0.2 -20 AMBIENT TEMPERATURE : Ta [℃] 100 VDD = 5.0V 0 2.6 2.0 100 Fig.19 Switch discharge resistance 0.3 -20 2.8 AMBIENT TEMPERATURE : Ta [℃] Fig.18 Switch discharge resistance 100 3.0 VDD = 5.0V SUPPLY VOLTAGE : VDD [V] 1 10 100 1000 10000 Css [pF] Fig.22 Turn On Rise time (vs. Css) Fig.23 Turn Off Fall time (vs. Css) 16 16 Ta = 25℃ VDD = 5.0V 14 SSCTL VOLTAGE : VSSCTL [V] SSCTL VOLTAGE : VSSCTL [V] Toff 5 AMBIENT TEMPERATURE : Ta [℃] 500 -40 6 0 2 100 UVLO THRESHOLD : VUVLO [V] -40 DISCHARGE RESISTANCE : RSWDC [Ω] Toff 5 0 0 UVLO HYSTERESIS : VUVLOHYS [V] VDD = 5.0V 6 TURN OFF TIME : Toff [us] TURN OFF TIME : Toff [us] TURN ON TIME : Ton [ms] VDD = 5.0V 12 10 8 6 4 2 0 14 12 10 8 6 4 2 0 2 3 4 5 SUPPLY VOLTAGE : VDD [V] Fig.24 SSCTL output voltage www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6 -40 -20 0 20 40 60 80 100 AMBIENT TEMPERATURE : Ta [℃] Fig.25 SSCTL output voltage 5/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F ◎BD6522F 60 50 40 30 20 10 3 4 5 50 40 VDD=3.3V 30 VDD=5.0V 20 10 6 80 60 40 20 0 -40 -20 0 20 40 60 80 2 100 5 6 SUPPLY CURRENT : VDD [V] Fig.26 ON resistance Fig.27 ON resistance Fig.28 Operating current (CTRL enable) 1.0 0.10 80 60 40 20 0 Ta = 25℃ VDD = 5.0V LEAK CURRENT : ILEAK [uA] OPERATING CURRENT : IDDST [uA] 100 0.08 0.06 0.04 0.02 -20 0 20 40 60 80 100 0.8 0.6 0.4 0.2 0.0 0.00 2 3 4 5 0 6 20 40 60 80 100 AMBIENT TEMPERATURE : Ta [℃] SUPPLY VOLTAGE : VDD [V] AMBIENT TEMPERATURE : Ta [℃] Fig.29 Operating current (CTRL enable) Fig.30 Operating current (CTRL disenable) Fig.31 Leak current 2.5 2.5 2.0 Low to High 1.5 High to Low 1.0 0.5 0.0 0.4 Ta = 25℃ VDD = 5.0V 2.0 CTRL HYSTERESIS : VCTRLHYS[V] CTRL INPUT VOLTAGE : VCTRL [V] Ta = 25℃ High to Low 1.5 Low to High 1.0 0.5 0.3 0.2 0.1 0.0 2 3 4 5 6 0 -40 -20 0 20 40 60 80 100 2 3 4 5 6 SUPPLY VOLTAGE : VDD [V] AMBIENT TEMPERATURE : Ta [℃] SUPPLY VOLTAGE : VDD [V] Fig.32 CTRL input voltage Fig.33 CTRL input voltage Fig.34 CTRL hysteresis voltage 5 0.4 5 Ta = 25℃ 0.3 0.2 0.1 0.0 VDD = 5.0V 4 TURN ON TIME : Ton [ms] TURN ON TIME : Ton [ms] VDD = 5.0V 3 2 1 -20 0 20 40 60 80 100 4 3 2 1 0 0 -40 4 AMBIENT TEMPERATURE : Ta [℃] VDD = 5.0V -40 3 SUPPLY VOLTAGE : VDD [V] 120 OPERATING CURRENT : IDD [uA] 60 Ta = 25℃ 100 0 2 CTRL INPUT VOLTAGE : VCTRL [V] 70 OPERATING CURRENT : IDD [uA] 70 ON RESISTANCE : Ron [mΩ] ON RESISTANCE : Ron [mΩ] Ta = 25℃ 0 CTRL HYSTERESIS : VCTRLHYS [V] 120 80 80 2 3 4 5 6 -40 -20 0 20 40 60 80 AMBIENT TEMPERATURE : Ta [℃] SUPPLY VOLTAGE :VDD [V] AMBIENT TEMPERATURE : Ta [℃] Fig.35 CTRL hysteresis voltage Fig.36 Turn On time Fig.37 Turn On time www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6/16 100 2009.05 - Rev.A Technical Note BD6520F,BD6522F 7 6 TURN OFF TIME : Toff [us] 5 4 3 2 1 5 4 3 2 1 0 2 3 4 5 -40 6 -20 0 20 40 60 80 SUPPLY VOLTAGE : VDD [V] AMBIENT TEMPERATURE : Ta [℃] Fig.38 Turn Off time Fig.39 Turn Off time 200 100 -40 -20 0 20 40 60 80 2.6 VDD increasing 2.4 VDD decreasing 2.2 -20 0 20 40 60 80 0.1 -20 0 20 40 60 80 100 Fig.43 UVLO hysteresis voltage SSCTL VOLTAGE : VSSCTL [V] TURN OFF TIME : Toff [us] 10000 6 16 10 Ta = 25℃ 14 12 10 8 6 4 2 0 1 1000 5 AMBIENT TEMPERATURE : Ta [℃] VDD = 5.0V, Ta = 25℃, RL = 10Ω 1 4 0.2 -40 100 VDD = 5.0V, Ta = 25℃, RL = 10Ω 10 3 VDD = 5.0V 100 Fig.42 UVLO threshold voltage 100 100 0 AMBIENT TEMPERATURE : Ta [℃] Fig.41 Switch discharge resistance 10 100 0 AMBIENT TEMPERATURE : Ta [℃] 1 200 Fig.40 Switch discharge resistance 2.8 -40 100 300 2 2.0 0 400 SUPPLY VOLTAGE : VDD [V] Ta = 25℃ 300 Ta = 25℃ 0.3 VDD = 5.0V 400 500 100 3.0 500 UVLO THRESHOLD : VUVLO [V] DISCHARGE RESISTANCE : RSWDC [Ω] 6 UVLO HYSTERESIS : VUVLOHYS [V] TURN OFF TIME : Toff [us] VDD = 5.0V 0 TURN ON TIME : Ton [ms] DISCHARGE RESISTANCE : RSWDC [Ω] 7 Ta = 25℃ 1 10 100 1000 10000 Css [pF] Css [pF] Fig.44 Turn On time (vs. Css) Fig.45 Turn Off time (vs. Css) 2 3 4 5 6 SUPPLY VOLTAGE : VDD [V] Fig.46 SSCTL output voltage SSCTL VOLTAGE : VSSCTL [V] 16 14 VDD = 5.0V 12 10 8 6 4 2 0 -40 -20 0 20 40 60 80 100 AMBIENT TEMPERATURE : Ta [℃] Fig.47 SSCTL output voltage www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 7/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F Waveform data VDD = 5V, CL = 47uF, RL = 47Ω, unless otherwise specified. VCTRL (5V/div.) VOUT (5V/div.) IOUT (0.5A/div.) VCTRL (5V/div.) VCTRL (5V/div.) VOUT (5V/div.) VOUT (5V/div.) IOUT (0.5A/div.) IOUT (0.5A/div.) TIME (1ms/div.) TIME (5ms/div.) Fig.48 Turn On Rise Time (BD6520F) VCTRL (5V/div.) TIME (1ms/div.) Fig.49 Turn Off Fall Time (BD6520F) VCTRL (5V/div.) Fig.50 Turn On Rise Time (BD6522F) VCTRL (5V/div.) CL=330uF Open CL=330uF Open VOUT (5V/div.) 470pF 1000pF 2200pF 4700pF IOUT (0.2A/div.) IOUT (0.5A/div.) TIME (5ms/div.) TIME (2ms/div.) Fig.51 Turn Off Fall Time (BD6522F) VCTRL (5V/div.) IOUT (0.5A/div.) Fig.52 Inrush current vs. Css (BD6520F) TIME (2ms/div.) Fig.53 Inrush current vs. Css (BD6522F) VCTRL (5V/div.) DISC terminal not in use VOUT (2V/div.) VOUT (2V/div.) Temperature decline DISC terminal in use Thermal shut down Latch release Return TIME (500ms/div.) TIME (20ms/div.) Fig.54 Discharge: CL = 47uF, RL = Open (BD6522F) Fig.55 Thermal shutdown VDD (2V/div.) VDD (2V/div.) VOUT (2V/div.) VOUT (2V/div.) TIME (500ms/div) Fig.56 UVLO (at VDD increase) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. TIME (500ms/div) Fig.57 UVLO (at VDD decrease) 8/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F Block diagram, pin configuration, pin description (BD6520F) VDDA OUTA 1 8 VDDB OUTB 2 7 Oscillator SSCTL Charge OUTC Pump 3 6 ＋ UVLO － Band Thermal Gap Shutdown S Q FF R VDDA 1 8 OUTA VDDB 2 7 OUTB SSCTL 3 6 OUTC CTRL 4 CTRL 5 VSS 4 VSS 5 Fig.58 Block diagram(BD6520F) Pin No. Symbol Pin Function Switch input pin At use, connect each pin outside. 1,2 VDDA, VDDB 3 SSCTL Soft start setting pin Add external capacitor, it is possible to delay switch On, Off time. 4 CTRL Control input pin Switch On at High level, switch Off at Low level. 5 VSS 6,7,8 OUTA, OUTB, OUTC www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Ground Switch output pin At use, connect each pin outside. 9/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F (BD6522F) VDDA OUTA 1 8 VDDB OUTB 2 7 Oscillator SSCTL Charge Pump 3 ＋ UVLO － DISC Band Thermal Gap Shutdown S Q 6 FF R CTRL VDDA 1 8 OUTA VDDB 2 7 OUTB SSCTL 3 6 DISC 4 CTRL 4 5 VSS VSS 5 Fig.59 Block diagram(BD6522F) Pin No. Symbol Pin Function Switch input pin At use, connect each pin outside. 1,2 VDDA, VDDB 3 SSCTL Soft start setting pin Add external capacitor, it is possible to delay switch On, Off time. 4 CTRL Control input pin Switch On at High level, switch Off at Low level. 5 VSS Ground 6 DISC Discharge pin 7,8 OUTA, OUTB www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Switch output pin At use, connect each pin outside. 10/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F I/O circuit Symbol Equivalent circuit BD6520F Pin No. Equivalent circuit BD6522F SSCTL SSCTL SSCTL 3 CTRL CTRL CTRL 4 DISC DISC 6 (BD6522F) OUT 6 (BD6520F), 7, 8 OUT OUT Fig.60 I/O circuit www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 11/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F Functional description 1. Switch operation VDD pin and OUT pin are connected to the drain and the source of switch MOSFET respectively. And the VDD is used also as power source input to internal control circuit. When CTRL input is set to High level and the switch is turned on, VDD and OUT is connected by a 50mΩ switch. In a normal condition, current flows from VDD to OUT. If voltage of OUT is higher than VDD, current flows from OUT to VDD, since the switch is bidirectional. In BD6520F, there is a parasitic diode between the drain and the source of switch MOSFET. Therefore, even when the switch is off, if the voltage of OUT is higher than that of VDD, current flows from OUT to VDD. In BD6522F, there is not this parasitic diode, it is possible to prevent current from flowing reversely from OUT to VDD. 2. Thermal shutdown Thermal shut down circuit turns off the switch when the junction temperature exceeds 135℃(Typ.). The switch off status of the thermal shut down is latched. Therefore, even when the junction temperature goes down, switch off is maintained. To release the latch, it is necessary to input a signal to switch off to CTRL terminal or make UVLO status. When the switch on signal is input or UVLO is released, the switch output is recovered. The thermal shut down circuit works when CTRL signal is active. 3. Low voltage malfunction prevention circuit (UVLO) The UVLO circuit monitors the voltage of the VDD pin, when the CTRL input is active. UVLO circuit prevents the switch from turning on until the VDD exceeds 2.5V(Typ.). If the VDD drops below 2.3V(Typ.) while the switch turns on, then UVLO shuts off the switch. 4. Soft start control In BD6520F/BD6522F, soft start is carried out in order to reduce inrush current at switch on. Further, in order to reduce inrush current, soft start control pin (SSCTL) is prepared. By connecting external capacitor to between SSCTL and GND, it is possible to make smoother the switch rise time. When the switch is enabled, SSCTL outputs voltage of about 13.5V. SSCTL terminal requires high impedance, so pay attention in packaging it so that there should not be leak current. And when voltage is impressed from the outside to SSCTL terminal, switch on, off cannot be made correctly. 5. Discharge circuit When the switch between the VDD and the OUT is OFF, the 200Ω(Typ.) discharge switch between OUT and GND turns on. By turning on this switch, electric charge at capacitive load is discharged. In BD6522F, the input of discharge circuit is separately prepared as DISC pin. When to use the discharge circuit, connect OUT pin and DISC pin outside. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 12/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F Timing diagram VDD VCTRL VOUT Discharge circuit ON OFF ON Fig.61 Normal operation VDD VUVLOL VUVLOH VCTRL VOUT Discharge circuit ON OFF Fig.62 UVLO operation Over temperature corrected Over temperature occurs Over temperature occurs Over temperature corrected VDD VCTRL VOUT Latch Release Discharge circuit OFF Set Release ON Release OFF Set Release OFF Fig.63 Thermal shutdown operation www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 13/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F Typical application circuits BD6520F Power Supply OUTA VDDA VDDA 1µF VDDB OUTB SSCTL OUTC CTRL VSS VDDB OUTB SSCTL On/Off CTRL Fig.64 Power supply switch circuit (BD6520F) DISC VSS Fig.65 Power supply switch circuit (BD6522F) BD6522F BD6522F OUTA VDDA OUTA Power Supply B VDDB Load Css On/Off VDDA OUTA 1µF Load Css Power Supply A BD6522F Power Supply OUTB VDDB Load OUTB Css Css SSCTL DISC SSCTL DISC On/Off On/Off CTRL VSS CTRL VSS Fig.66 2 power supply changeover switch circuit (BD6522F) Thermal derating characteristic (SOP8) 600 POWER DISSIPATION: Pd[mW] 500 400 300 200 100 0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE: Ta [℃ ] Fig. 67 Power dissipation curve www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 14/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F Cautions on use (1) Absolute Maximum Ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc. (2) Operating conditions These conditions represent a range within which characteristics can be provided approximately as expected. The electrical characteristics are guaranteed under the conditions of each parameter. (3) Reverse connection of power supply connector The reverse connection of power supply connector can break down ICs. Take protective measures against the breakdown due to the reverse connection, such as mounting an external diode between the power supply and the IC’s power supply terminal. (4) Power supply line Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. In this regard, for the digital block power supply and the analog block power supply, even though these power supplies has the same level of potential, separate the power supply pattern for the digital block from that for the analog block, thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. For the GND line, give consideration to design the patterns in a similar manner. Furthermore, for all power supply terminals to ICs, mount a capacitor between the power supply and the GND terminal. At the same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant. (5) GND voltage Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state. Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric transient. (6) Short circuit between terminals and erroneous mounting In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the GND terminal, the ICs can break down. (7) Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them. (8) Inspection with set PCB On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress. Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set PCB to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig. After the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In addition, for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the transportation and the storage of the set PCB. (9) Input terminals In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a voltage lower than the GND respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics. (10) Ground wiring pattern If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND pattern from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal GND. Pay attention not to cause fluctuations in the GND wiring pattern of external parts as well. (11) External capacitor In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc. (12) Thermal shutdown circuit (TSD) When junction temperatures become 135°C (typ.) or higher, the thermal shutdown circuit operates and turns a switch OFF. The thermal shutdown circuit, which is aimed at isolating the LSI from thermal runaway as much as possible, is not aimed at the protection or guarantee of the LSI. Therefore, do not continuously use the LSI with this circuit operating or use the LSI assuming its operation. (13) Thermal design Perform thermal design in which there are adequate margins by taking into account the power dissipation (Pd) in actual states of use. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 15/16 2009.05 - Rev.A Technical Note BD6520F,BD6522F Ordering part number B D 6 Part No. 5 2 0 F Part No. 6520 6522 - Package F: SOP8 E 2 Packaging and forming specification E2: Embossed tape and reel (SOP8) SOP8 <Tape and Reel information> 6 5 +6° 4° −4° 0.3MIN 7 4.4±0.2 6.2±0.3 8 1 2 3 0.9±0.15 5.0±0.2 (MAX 5.35 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 ) 4 0.595 1.5±0.1 +0.1 0.17 -0.05 0.11 S 1.27 0.42±0.1 1pin (Unit : mm) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Reel 16/16 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 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. 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