Power Management Switch IC Series for PCs and Digital Consumer Product Power Switch IC for ExpressCardTM BD4154FV No.09029EAT09 ●Description TM BD4154FV is a power management switch IC for the next generation PC card (ExpressCard ) developed by the PCMCIA. TM TM It conforms to the PCMCIA ExpressCard Standard, ExpressCard Compliance Checklist, and ExpressCardTM Implementation Guideline, and obtains the Compliance ID “EC100040” from PCMCIA. The power switch offers a number of functions - card detector, and system status detector - which are ideally suited for laptop and desktop computers. ●Features TM 1) Incorporates three low on-resistance FETs for ExpressCard . 2) Incorporates an FET for output discharge. 3) Incorporates an enabler. 4) Incorporates under voltage lockout (UVLO) protection. 5) Employs an SSOP-B20 package. 6) Built-in thermal shutdown protector (TSD). 7) Built-in soft start function. 8) Incorporates an overcurrent protection (OCP). 9) Built-in enable signal for PLL TM 10) Built-in Pull up resistance for detecting ExpressCard TM 11) Conforms to the ExpressCard Standard. 12) Conforms to the ExpressCardTM Compliance Checklist. 13) Conforms to the ExpressCardTM Implementation Guideline. ●Applications TM Laptop and desktop computers, and other ExpressCard equipped digital devices. ●Product Lineup Parameter BD4154FV Package SSOP-B20 “ExpressCardTM” is a registered trademark registered of the PCMCIA (Personal Computer Memory Card International Association). www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1/15 2009.05 - Rev.A Technical Note BD4154FV ●Absolute Maximum Ratings Parameter Input Voltage Logic Input Voltage 1 Logic Output Voltage 1 Logic Output Voltage 2 Output Voltage Symbol Limit V3AUX_IN, V3_IN, V15_IN EN,CPPE#,CPUSB#,SYSR, PERST_IN#,RCLKEN RCLKEN Unit -0.3～5.0 *1 V *1 V -0.3～V3AUX_IN+0.3 *1 V PERST# -0.3～V3AUX_IN+0.3 V V3AUX,V3, V15 -0.3～5.0 *1 V -0.3～V3AUX_IN+0.3 Output Current 1 IOV3AUX 1.0 A Output Current 2 IOV3 2.0 A Output Current 3 IOV15 2.0 A *2 mW Power Dissipation 1 Pd1 500.0 Power Dissipation 2 Pd2 812.5 *3 mW Operating Temperature Range Topr -40～+100 ℃ Storage Temperature Range Tstg -55～+150 ℃ Tjmax +150 ℃ Maximum Junction Temperature *1 Not to exceed Pd. *2 Reduced by 4.0mW for each increase in Ta of 1℃ over 25℃ *3 Reduced by 6.5mW for each increase in Ta of 1℃ over 25℃(When mounted on a board 70mmx70mmx1.6mm Glass-epoxy PCB) ●Operating Conditions (Ta=25℃) Parameter Symbol MIN MAX Unit Input Voltage 1 V3AUX_IN 3.0 3.6 V Input Voltage 2 V3_IN 3.0 3.6 V Input Voltage 3 V15_IN 1.35 1.65 V Logic Input Voltage 1 EN -0.3 3.6 V Logic Input Voltage 2 CPPE#,CPUSB#,SYSR, PERST_IN#,RCLKEN 0 V3AUX_IN V Logic Output Voltage 1 RCLKEN 0 V3AUX_IN V Logic Output Voltage 2 PERST# 0 V3AUX_IN V Output Current 1 IOV3AUX 0 275 mA Output Current 2 IOV3 0 1.3 A Output Current 3 IOV15 0 650 mA * This product is not designed to offer protection against radioactive rays. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 2/15 2009.05 - Rev.A Technical Note BD4154FV ●Electrical Characteristics (unless otherwise noted, Ta=25℃ VEN=3.3V V3AUX_IN =V3_IN=3.3V,V15_IN=1.5V) Standard Value Parameter Symbol Unit Condition MIN TYP MAX µA Standby Current IST 40 80 VEN=0V (Include IEN, IRCLKEN) µA Bias Current 1 Icc1 120 250 VSYSR=0V µA Bias Current 2 Icc2 250 500 VSYSR=3.3V [Enable] High Level Enable Input Voltage VENHI 2.0 5.5 V V Low Level Enable Input Voltage VENLOW -0.2 0.8 µA Enable Pin Input Current IEN 10 30 VEN=0V [Logic] V High Level Logic Input Voltage VLHI 2.0 V Low Level Logic Input Voltage VLLOW 0.8 µA 0 1 CPPE#=3.6V ICPPE# µA 10 30 CPPE#=0V µA 0 1 CPUSB#=3.6V ICPUSB# µA 10 30 CPUSB#=0V µA 0 1 SYSR=3.6V Logic Pin Input Current ISYSR µA 10 30 SYSR=0V µA 0 1 PERST_IN#=3.6V IPRT_IN# µA 10 30 PERST_IN#=0V µA 0 1 RCLKEN=3.6V IRCLKEN µA 10 30 RCLKEN=0V RCLKEN Low Voltage VRCLKEN 0.1 0.3 V IRCLKEN=0.5mA RCLKEN Leak Current IRCLKEN 1 µA VRCLKEN=3.65V [Switch V3AUX] On Resistance RV3AUX 120 220 mΩ Tj=-10～100℃ * Discharge On Resistance RV3AUX Dis 60 150 Ω [Switch V3] On Resistance RV3 42 90 mΩ Tj=-10～100℃ * Discharge On Resistance RV3Dis 60 150 Ω [Switch V15] On Resistance RV15 45 90 mΩ Tj=-10～100℃ * Discharge On Resistance RV15Dis 60 150 Ω [Over Current Protection] V3 Over Current OCPV3 1.3 A V3AUX Over Current OCPV3AUX 0.275 A V15 Over Current OCPV15 0.65 A [Under Voltage Lockout] V3_IN UVLO OFF Voltage VUVLOV3_IN 2.70 2.80 2.90 V sweep up V3_IN Hysteresis Voltage ⊿VUVLOV3_IN 50 100 150 mV sweep down V3AUX_IN UVLO OFF Voltage VUVLOV3AUX_IN 2.70 2.80 2.90 V sweep up V3AUX_IN Hysteresis Voltage ⊿VUVLOV3AUX_IN 50 100 150 mV sweep down V15_IN UVLO OFF Voltage VUVLOV15_IN 1.15 1.20 1.25 V sweep up V15_IN Hysteresis Voltage ⊿VUVLOV15_IN 50 100 150 mV sweep down [POWER GOOD] V3 POWER GOOD Voltage PGV3 2.700 2.850 3.000 V V3AUX POWER GOOD 2.700 2.850 3.000 V PGV3AUX Voltage V15 POWER GOOD Voltage PGV15 1.200 1.275 1.350 V PERST# LOW Voltage VPERST#Low 0.1 0.3 V IPERST=0.5mA PERST# HIGH Voltage VPERST#HIGH 3.0 V PERST# Delay Time TPERST# 4 20 ms PERST# assertion time Tast 500 ns [OUTPUT RISE TIME] V3_IN to V3 TV3 0.1 3 ms V3AUX_IN to V3AUX TV3AUX 0.1 3 ms V15_IN to V15 TV15 0.1 3 ms * Design target www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/15 2009.05 - Rev.A Technical Note BD4154FV ●Reference data CPPE#(2V/div) CPPE#(2V/div) SYSR(2V/div) V3(2V/div) V3(2V/div) V3(2V/div) V3AUX(2V/div) V3AUX(2V/div) V3AUX(2V/div) RV3=3.3Ω RV3AUX=13.2Ω RV15=3Ω V15(1V/div) V15(1V/div) 5.0ms/div V15(1V/div) 5.0ms/div Fig.1 Card Assert/ De-assert (Active) Fig.2 Card Assert/De-assert (Standby) SYSR(2V/div) 5.0ms/div Fig.3 System Active⇔Standby ( Card Present) CPUSB#(2V/div) CPPE#(2V/div) V3(2V/div) V3AUX(2V/div) V3(2V/div) V3(2V/div) V3AUX(2V/div) V3AUX(2V/div) V15(1V/div) V15(1V/div) V15(1V/div) 5.0ms/div 500μs/div Fig.4 System Active⇔Standby (No Card) Fig.5 Wakeup Wave Form (Card Assert) EN(2V/div) V3(2V/div) V3AUX(2V/div) CPPE#(2V/div) V3(2V/div) V3(2V/div) V3AUX(2V/div) V15(1V/div) V15(1V/div) 500μs/div 500μs/div Fig.8 Wakeup Wave Form (Standby→Active) CPUSB#(2V/div) Wakeup Wave Form (USB2.0 Assert) SYSR(2V/div) V3AUX(2V/div) V15(1V/div) Fig.7 Wakeup Wave Form (Shut Down→Active) 500μs/div Fig.6 500µs/div Fig.9 Power Down Wave Form (Card De-assert) EN(2V/div) SYSR(2V/div) V3(2V/div) V3(2V/div) V3(2V/div) V3AUX(2V/div) V3AUX(2V/div) V15(1V/div) V15(1V/div) V3AUX(2V/div) 500µs/div Fig.10 Power Down Wave Form (USB2.0 De-assert) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Fig.11 500µs/div Power Down Wave Form (Active→Shut Down) 4/15 V15(1V/div) Fig.12 5.0ms/div Power Down Wave Form (Active→Standby) 2009.05 - Rev.A Technical Note BD4154FV CPPE#(2V/div) CPPE#(2V/div) CPPE#(2V/div) V3(2V/div) V3(2V/div) V3(2V/div) V3AUX(2V/div) V3AUX(2V/div) V3AUX(2V/div) RCLKEN(2V/div) PERST#(2V/div) PERST#(2V/div) 5.0ms/div 5.0ms/div Fig.13 PERST# Wave Form (Card Assert/ De-assert) CPUSB#(2V/div) 5.0ms/div Fig.14 RCLKEN Wave Form (Card Assert/ De-assert) PERST_IN#(2V/div) PERST_IN#(2V/div) V3(2V/div) V3(2V/div) V3AUX(2V/div) V3AUX(2V/div) RCLKEN(2V/div) V3(2V/div) RCLKEN Wave Form (USB2.0 Assert/ De-assert) V3_IN(2V/div) 1.0ms/div Fig.17 PERST# Wave Form (PERST_IN# Input) V3AUX_IN(2V/di V3(2V/div) V3(2V/div) V3AUX(2V/div) V15(1V/div) 500μs/div Fig.19 Output Voltage (V3_IN:OFF→ON) V3_IN(2V/div) V3(2V/div) V3AUX(2V/div) V15(1V/div) V15(1V/div) 500μs/div Fig.22 Output Voltage (V3_IN:ON→OFF) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1.0ms/div Fig.18 RCLKEN Wave Form (PERST_IN# Input) V15_IN(2V/div) V3(2V/div) V3AUX(2V/div) V15(1V/div) 500μs/div 500μs/div Fig.20 Output Voltage (V3AUX_IN:OFF→ON) V3AUX_IN(2V/di Fig.21 Output Voltage (V15_IN:OFF→ON) V15_IN(2V/div) V3(2V/div) V3(2V/div) V3AUX(2V/div) V3AUX(2V/div) RV3=3.3Ω RV3AUX=13.2Ω RV15=3Ω V3AUX(2V/div) RCLKEN(2V/div) PERST#(2V/div) 5.0ms/div Fig.16 Fig.15 PERST# Wave Form (USB2.0 Assert/ De-assert) V3AUX(2V/div) V15(1V/div) RV3=3.3Ω RV3AUX=13.2Ω RV15=3Ω 500μs/div Fig.23 Output Voltage (V3AUX_IN:ON→OFF) 5/15 RV3=3.3Ω RV3AUX=13.2Ω V15(1V/div) RV15=3Ω 500μs/div Fig.24 Output Voltage (V15_IN:ON→OFF) 2009.05 - Rev.A Technical Note BD4154FV ●Block Diagram V3-1 V3_IN1 4 VD 5 3.3V 3.3V/1.30A 6 7 V3_IN2 V3-2 TSD,CL,UVLO 3.3V AUX/275mA V3AUX_IN 18 17 VD V3AUX 3.3V TSD,CL,UVLO_AUX V15_IN1 1.5V V15_IN2 V15-1 1.5V/625mA 15 14 16 CPPE# CPUSB# SYSR V3AUX_IN VD 12 Input 11 logic 19 RCLKEN Power good TSD,CL,UVLO 3 8 PERST# EN,SYSR,CPUSB#,CPPE# V3AUX_IN Thermal protection TSD 1 PERST_IN# V3_IN,V3AUX_IN,V15_IN CL V3,V3AUX,V15 EN 2 V15-2 Reference Block V3_IN V3AUX_IN Charge Pump VD V15_IN Under voltage lock out UVLO UVLO_AUX 10 GND ●PIN CONFIGRATION PERST_IN# 1 20 NC EN 2 SYSR ●PIN FUNCTION 19 RCLKEN 3 18 V3AUX_IN V3_IN1 4 17 V3AUX V3_IN2 5 16 V15_IN2 V3_1 6 15 V15_IN1 V3_2 7 14 V15_2 PERST# 8 13 V15_1 TEST 9 12 CPPE# GND 10 11 CPUSB# SSOP-B20 Package www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. PIN No PIN NAME 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 PERST_IN# EN SYSR V3_IN1 V3_IN2 V3_1 V3_2 PERST# TEST GND CPUSB# CPPE# V15_1 V15_2 V15_IN1 V15_IN2 V3AUX V3AUX_IN 19 RCLKEN 20 NC 6/15 PIN FUNCTION PERST# control input pin (SysReset#) Enable input pin Logic input pin V3 input pin 1 V3 input pin 2 V3 output pin 1 V3 output pin 2 Logic output pin Test pin GND pin Logic input pin Logic input pin V15 output pin 1 V15 output pin 2 V15 input pin 1 V15 input pin 2 V3AUX output pin V3AUX input pin 1 Reference clock enable signal/ Power good signal (No delay) Non connection 2009.05 - Rev.A Technical Note BD4154FV ●Description of block operation EN With an input of 2.0 volts or higher, this terminal goes HIGH to activate the circuit, and goes LOW to deactivate the circuit (with the standby circuit current of 40 μA), It discharges each output and lowers output voltage when the input falls to 0.8 volts or less. V3_IN, V15_IN, and V3AUX_IN These are the input terminals for each channel of a 3ch switch. V3_IN and V15_IN terminals have two pins each, which should be short-circuited on the pc board with a thick conductor. A large current runs through these three terminals : (V3_IN: 1.35A; V3AUX_IN: 0.275 A; and V15_IN: 0.625 A). In order to lower the output impedance of the connected power supply, it is recommended that ceramic capacitors (with B-type characteristics or better) be provided between these terminals and the ground. Specifically, the capacitors should be on the order of 1 μF between V3_IN and GND, and between V15_IN and GND; and on the order of 0.1 μF between V3AUX_IN and GND. V3, V15, and V3AUX These are the output terminals for each switch. The V3 and V15 terminals have two pins each, which should be short-circuited on the PC board and connected to an ExpressCard connector with a thick conductor, as short as possible. In order to stabilize the output, it is recommended that ceramic capacitors (with B-type characteristics or better) be provided between these terminals and the ground. Specifically, the capacitors should be on the order of 10 μF between V3 and GND, and between V15 and GND; and on the order of 1 μF between V3AUX and GND. CPPE# This pin is used to find whether or not a PCI-Express signal compatible card is present. Turns to “High” level with an input of 2.0 volts or higher, which means that no card is provided, while it turns to “Low” level when the input is lowered to 0.8 volts or less, which means that a card is provided. Controls the ON/OFF, switch selecting the proper mode based on the status of the system. Pull up resistance (100kΩ～200kΩ) is built into, so the number of components is reduced. CPUSB# This pin is used to find whether or not a USB2.0 signal compatible card is present. Turns to “High” level with an input of 2.0 volts or higher, which means that no card is provided, while it turns to “Low” level when the input is lowered to 0.8 volts or less, which means that a card is provided. Controls the ON/OFF switch, selecting the proper mode based on the system status. Pull up resistance (100kΩ～200kΩ) is built into, so the number of components is reduced. SYSR This pin is used to detect the system status. Turns to “High” level with an input of 2.0 volts or higher, which means that the system is activated, while it turns to “Low” level when the input is lowered to 0.8 volts or less, which means that the system is on standby. PERST_IN# This pin is used to control the reset signal (PERST#) to a card from the system side. (Also referred to as “SysReset#” by PCMCIA.) Turns to “High” level with an input of 2.0 volts or higher, and sets PERST# to “High” AND with a “Power Good” output. Turns to “Low” level and sets PERST# to “Low” when the input falls to 0.8 volts or less. PERST# This pin is used to send a reset signal to a PCI-Express compatible card. Reset status is determined by the outputs, PERST_IN#, CPPE# system status, and EN on/off status. Turns to “High” level and activates the PCI-Express compatible card only if each output is within the “Power Good” threshold, with the card inserted and PERST_IN# turned to “High” level. RCLKEN This pin is used to send an enable signal to the reference clock. Activation status is determined by the outputs, CPPE# system status, and EN on/off status. Turns to “High” level and activates the reference clock PLL only if each output is within the “Power Good” threshold, with the card kept inserted. TEST This pin is used to test, which should be short-circuited to the GND. When it is short-circuited to V3AUX_IN, UVLO (V3_IN, V15_IN) turns OFF. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 7/15 2009.05 - Rev.A Technical Note BD4154FV ●Timing Chart Power ON/OFF Status of ExpressCardTM System Status Primary Auxiliary OFF OFF ON ON ON ON ExpressCardTM Module Status Power Switch Status Primary(+3.3V and +1.5V) Auxiliary(3.3V Aux) Don’t care OFF OFF De-asserted OFF OFF Asserted ON ON De-asserted Asserted Before This Asserted After This OFF OFF OFF OFF ON OFF TM ExpressCard States Transition Diagram SYSR=L CP#=L→H SYSR=H⇔L CP#=H SYSR=H CP#=H→L SYSR=L CP#=H⇔L V3AUX=OFF V15=V3=OFF SYSR=L→H CP#=L V3AUX=ON V15=V3=ON SYSR=H→L CP#=L SYSR=H CP#=L→H SYSR=L→H CP#=L V3AUX=ON V15=V3=OFF SYSR=H→L CP#=L SYSR=L ⇔ CP#=L SYSR=H CP#=H System Status Card Status Stand-by Status :SYSR=L ON Status :SYSR=H Card De-asserted Status :CP#=H From ON to Stand-by Status :SYSR=H→L From De-asserted to Asserted Status :CP#=H→L From Stand-by to ON Status :SYSR=L→H From Asserted to De-asserted Status :CP#=L→H www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Card Asserted Status 8/15 :CP#=L 2009.05 - Rev.A Technical Note BD4154FV ■ BD4154FV Evaluation Board U1 SW1 R1 GND SW2 1 PERST_IN# GND SW3 R2 C1 GND R3 C2 GND EN GND SYSR C4 GND 20 SW4 2 EN RCLKEN 19 RCLKEN V3AUX_IN(S) 3 C3 V3_IN(S) GND 4 V3_IN BD4154FV PERST_IN# 5 SYSR V3AUX_IN1 V3_IN1 V3AUX V3_IN2 V15_IN2 18 V3AUX_IN V3AUX(S) C18 GND V15_IN(S) 16 C17 GND 15 C15 GND 17 V3(S) 6 V3 V3_1 V15_IN1 V3_2 V15_2 GND V3AUX_IN V3AUX V15_IN C6 7 GND 8 PERST # V3AUX_IN SW7 9 10 GND PERST# V15_1 TEST CPPE# GND CPUSB# SSOP-B20 14 V15(S) V15 C13 GND 13 SW5 R12 12 11 C12 GND CPPE# SW6 GND R11 CPUSB# C11 GND GND ■ BD4154FV Evaluation Board Application Components Part No Value Company Part Name R1 0Ω ROHM MCR03series R2 0Ω ROHM MCR03series R3 0Ω ROHM MCR03series R11 0Ω ROHM MCR03series R12 0Ω ROHM MCR03series C1 - - - C2 - - - C3 - - - C4 1μF ROHM MCH213CN 105K C6 10μF ROHM MCH218CN 106K C11 - - - C12 - - - C13 10μF ROHM MCH218CN 106K C15 1μF ROHM MCH213CN 105K C17 1μF ROHM MCH213CN 105K C18 0.1μF ROHM MCH182CN 104K www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 9/15 2009.05 - Rev.A Technical Note BD4154FV ■ BD4154FV Evaluation Board Layout Silk Screen TOP Layer Mid Layer 1 Mid Layer 2 Bottom Layer www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 10/15 2009.05 - Rev.A Technical Note BD4154FV ●Application Circuit (Circuit for ExpressCardTM Compliance Checklist) CPPE#(1) CPUSB#(2) 3.3V(3) CPPE#(12pin) RCLKEN(19pin) CPUSB#(11pin) V3_IN(4,5pin) V3(6,7pin) 3.3V(7) V3AUX_IN(18pin) 3.3Vaux(8) BD4154FV 3.3Vaux(4) V3AUX(17pin) V15_IN(15,16pin) 1.5V(9) 1.5V(5) V15(13,14pin) PERST_IN#(1pin) SysReset#(10) PERST#(6) PERST#(8pin) EN(2pin) SYSR(3pin) GND(10pin) ●Heat loss Thermal design should allow the device to operate within the following conditions. Note that the temperatures listed are the allowed temperature limits. Thermal design should allow sufficient margin from these limits. 1. Ambient temperature Ta can be no higher than 100°C. 2. Chip junction temperature Tj can be no higher more than 150°C. Chip junction temperature Tj can be determined as follows: ①Chip junction temperature Tj is calculated from IC surface temperature TC under actual application conditions: Tj=TC+θj-cxW ＜Reference value＞ θj-c:SSOP-B20 35 /W ②Chip junction temperature Tj is calculated from ambient temperature Ta: Tj=TC+θj-axW ＜Reference value＞ θj-a:SSOP-B20 250℃/W (IC only) 153.8℃/W Single-layer substrate (substrate surface copper foil area: less than 3%) Most of heat loss in the BD4154FV occurs at the output switch. The power lost is determined by multiplying the on-resistance by the square of output current of each switch. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 11/15 2009.05 - Rev.A Technical Note BD4154FV ●Equivalent Circuit 1pin<PERST_IN#> V3AUX_IN 2pin<EN> V3AUX_IN 4,5pin<V3_IN1,V3_IN2> 3pin<SYSR> V3AUX_IN V3AUX_IN 6,7pin<V3_1,V3_2> V3AUX_IN V3AUX_IN 8pin<PERST#> V3_IN V3AUX_IN V3 9pin<TEST> 11pin<CPUSB#> 12pin<CPPE#> V3AUX_IN 13,14pin<V15_1,V15_2> V3AUX_IN 15,16pin<V15_IN1,V15_IN2> V3_IN V3AUX_IN V3AUX_IN 17pin<V3AUX> V3AUX_IN V15 18pin<V3AUX_IN> 19pin<RCLKEN > V3AUX_IN V3AUX www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 12/15 2009.05 - Rev.A Technical Note BD4154FV ●Notes for Use 1.Absolute maximum ratings Although quality is rigorously controlled, the device may be destroyed when applied voltage, operating temperature, etc. exceeds its absolute maximum rating. Because the source (short mode or open mode) cannot be identified once the IC is destroyed, it is important to take physical safety measures such as fusing when implementing any special mode that operates in excess of absolute rating limits. 2.Thermal design Consider allowable loss (Pd) under actual operating conditions and provide sufficient margin in the thermal design. 3.Terminal-to-terminal short-circuit and mis-mounting When the mounting the IC to a printed circuit board, take utmost care to assure the position and orientation of the IC are correct. In the event that the IC is mounted erroneously, it may be destroyed. The IC may also be destroyed when a short-circuit is caused by foreign matter introduced into the clearance between outputs, or between an output and power-GND. 4.Operation in strong electromagnetic fields Using the IC in strong electromagnetic fields may cause malfunctions. Exercise caution in respect to electromagnetic fields. 5.Built-in thermal shutdown protection circuit This IC incorporates a thermal shutdown protection circuit (TSD circuit). The working temperature is 175°C (standard value) with a -15°C (standard value) hysteresis width. When the IC chip temperature rises the TSD circuit is activated, while the output terminal is brought to the OFF state. The built-in TSD circuit is intended exclusively to shut down the IC in a thermal runaway event, and is not intended to protect the IC or guarantee performance in these conditions. Therefore, do not operate the IC after with the expectation of continued use or subsequent operation once this circuit is activated. 6.Capacitor across output and GND When a large capacitor is connected across the output and GND, and the V3AUX_IN is short-circuited with 0V or GND for any reason, current charged in the capacitor flows into the output and may destroy the IC. Therefore, use a capacitor smaller than 1000 μF between the output and GND. 7.Set substrate inspection Connecting a low-impedance capacitor to a pin when running an inspection with a set substrate may produce stress on the IC. Therefore, be certain to discharge electricity at each process of the operation. To prevent electrostatic accumulation and discharge in the assembly process, thoroughly ground yourself and any equipment that could sustain ESD damage, and continue observing ESD-prevention procedures in all handling, transfer and storage operations. Before attempting to connect the set substrate to the test setup, make certain that the power supply is OFF. Likewise, be sure the power supply is OFF before removing the substrate from the test setup. 8.IC terminal input + This integrated circuit is a monolithic IC, with P substrate and P isolation between elements. The P layer and N layer of each element form a, PN junction. When the potential relation is GND>terminal A>terminal B, the PN junction works as a diode, and when terminal B>GND terminal A, the PN junction operates as a parasitic transistor. Parasitic elements inevitably form, due to the nature of the IC construction. The operation of the parasitic element gives rise to mutual interference between circuits and results in malfunction, and eventually, breakdown. Consequently, take utmost care not to use the IC in a way that would cause the parasitic element to actively operate, such as applying voltage lower than GND (P substrate) to the input terminal. Resistor NPN Transistor Structure (NPN) （PIN A） （PIN B） E C Parasitic diode GND N P+ P+ P P P+ N GND （PIN B） P+ N N N P substrate （PIN A） B N Parasitic diode GND C N B E P substrate Parasitic diode GND GND Nearby other device Parasitic diode 9. GND wiring pattern If both a small signal GND and a high current GND are present, it is recommended that the patterns for the high current GND and the small signal GND be separated. Proper grounding to the reference point of the set should also be provided. In this way, the small signal GND voltage will by unaffected by the change in voltage stemming from the pattern wiring resistance and the high current. Also, pay special attention to avoid undesirable wiring pattern fluctuations in any externally connected GND component. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 13/15 2009.05 - Rev.A Technical Note BD4154FV 10. Electrical characteristics The electrical characteristics in the Specifications may vary, depending on ambient temperature, power supply voltage, circuit(s) externally applied, and/or other conditions. Therefore, please check all such factors, including transient characteristics, that could affect the electrical characteristics. 11. Capacitors applied to input terminals The capacitors applied to the input terminals (V3_IN, V3AUX_IN and V15_IN) are used to lower the output impedance of the connected power supply. An increase in the output impedance of the power supply may result in destabilization of input voltages (V3_IN, V3AUX_IN and V15_IN). It is recommended that a low-ESR capacitor be used, with a lower temperature coefficient (change in capacitance vs. change in temperature), Recommended capacitors are on the order of 0.1 μF for V3AUX_IN, and1 μF for V3_IN and V15_IN. However, they must be thoroughly checked at the temperature and with the load range expected in actual use, because capacitor selection depends to a significant degree on the characteristics of the input power supply to be used and the conductor pattern of the PC board. 12. Capacitors applied to output terminals Capacitors for the output terminals (V3, V3_AUX, and V15), should be connected between each of the output terminals and GND. A low-ESR, low temperature coefficient output capacitor is recommended-on the order of 1 μF for V3 and V15 terminals, and 1μF less for V3_AUX. However, they must be thoroughly checked at the temperature and with the load range expected in actual use, because capacitor selection depends to a significant degree on the temperature and the load conditions. 13. Not of a radiation-resistant design. 14. Allowable loss (Pd) With respect to the allowable loss, please refer to the thermal derating characteristics shown in the Exhibit, which serves as a rule of thumb. When the system design causes the IC to operate in excess of the allowable loss, chip temperature will rise, reducing the current capacity and decreasing other basic IC functionality. Therefore, design should always enable IC operation within the allowable loss only. 15. Operating range Basic circuit functions and operations are warranted within the specified operating range the working ambient temperature range. Although reference values for electrical characteristics are not warranted, no rapid or extraordinary changes in these characteristics are expected, provided operation is within the normal operating and temperature range. 16. The applied circuit example diagrams presented here are recommended configurations. However, actual design depends on IC characteristics, which should be confirmed before operation. Also, note that modifying external circuits may impact static, noise and other IC characteristics, including transient characteristics. Be sure to allow sufficient margin in the design to accommodate these factors. 17. Wiring to the input terminals (V3 IN, V3AUX IN, and V15 IN) and output terminals (V3, V3AUX and V15) of the built-in FET should be carried out with special care. Using unnecessarily long and/or thin conductors may decrease output voltage and degrade other characteristics. 18. Heatsink The heatsink is connected to the SUB, which should be short-circuited to the GND. Proper heatsink soldering to the PC board should enable lower thermal resistance. ●Power Dissipation Mounted on board 70mmx70mmx1.6mm glass-epoxy PCB θj-a=153.8℃/W [mW] 1000 812.5mW Power Dissipation (Pd) 800 Without heat sink θj-a=250.0℃/W 500mW 600 100℃ 400 200 0 0 25 50 75 100 125 150 [℃] Ambient Temperature (Ta) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 14/15 2009.05 - Rev.A Technical Note BD4154FV ●Ordering part number B D 4 Part Number 1 5 4 F Part Number V - Package FV : SSOP-B20 E 2 Packaging and forming specification E2: Embossed tape and reel (SSOP-B20) SSOP-B20 <Tape and Reel information> 6.5 ± 0.2 11 0.3Min. 4.4 ± 0.2 6.4 ± 0.3 20 1 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 ) 10 0.1± 0.1 1.15 ± 0.1 0.15 ± 0.1 0.1 0.65 0.22 ± 0.1 1pin (Unit : mm) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Reel 15/15 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