® RT8463 High Voltage Multi-Topology LED Driver General Description Features The RT8463 is a current mode PWM regulator for LED driving applications. With a 2A power switch, wide input voltage (4.5V to 50V) and output voltage (up to 50V) ranges, the RT8463 can operate in any of the three common topologies : Buck, Boost or Buck-Boost. With 470kHz operating frequency, the size of the external PWM inductor and input/output capacitors can be minimized. High efficiency is achieved by a 100mV current sensing control. Brightness dimming can be controlled from either analog or PWM signal. A unique built-in clamping comparator and filtering resistor allow easy low noise analog dimming conversion from PWM signal with only one external capacitor. High Voltage : VIN Up to 50V, VOUT Up to 50V Buck, Boost or Buck-Boost Operation Built-In 2A Power Switch Current Mode PWM Control 470kHz Fixed Switching Frequency Easy Dimming : Analog, PWM Digital or PWM Converting to Analog with One External Capacitor Adjustable Soft-Start to Avoid Inrush Current Adjustable Over Voltage Protection to Limit Output Voltage Thermal Shutdown Under Voltage Lockout RoHS Compliant and Halogen Free Applications The RT8463 is available in the TSSOP-14 (Exposed pad) and WDFN-12L 3x3 packages. GPS, Portable DVD Backlight Desk Lights and Room Lighting Industrial Display Backlight Ordering Information Marking Information RT8463 RT8463GCP Package Type CP : TSSOP-14 (Exposed Pad) QW : WDFN-12L 3x3 (W-Type) (Exposed Pad-Option 1) RT8463GCP : Product Number RT8463 GCPYMDNN Lead Plating System G : Green (Halogen Free and Pb Free) RT8463GQW 98 = : Product Code Note : YMDNN : Date Code 98=YM DNN Richtek products are : YMDNN : Date Code RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Simplified Application Circuit C1 5V PWM Dimming Control R1 C2 C3 C6 RT8463 VCC EN DCTL SW ISP ISN VC SS ACTL OVP C4 Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS8463-01 August 2014 D1 L VIN VOUT R2 R3 CREG C5 VOUT R4 GND is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT8463 Pin Configurations (TOP VIEW) ISP ISN VC ACTL DCTL EN GND 14 2 13 3 12 4 GND 5 11 10 6 15 7 9 8 VCC CREG SW GND SS OVP GND ISP ISN VC ACTL DCTL EN TSSOP-14 (Exposed Pad) 1 2 3 4 5 6 GND 13 12 11 10 9 8 7 VCC CREG SW GND SS OVP WDFN-12L 3x3 Functional Pin Description Pin No. Pin Name TSSOP-14 WDFN-12L 3x3 (Exposed Pad) Pin Function 1 1 ISP Positive Current Sense Input. 2 2 ISN Negative Current Sense Input. Voltage threshold between ISP and ISN is 100mV. 3 3 VC Compensation Node for PWM Boost Converter Loop. 4 4 ACTL Analog Dimming Control Input. Effective programming range is between 0.2V and 1.2V. 5 5 DCTL Digital Dimming Control Input. By adding a 0.47F filtering capacitor on the ACTL pin, the PWM dimming signal on DCTL pin will be averaged and converted into analog dimming signal on the ACTL pin. VACTL = 1.2V x PWM dimming duty cycle. 6 6 EN Enable Control Input (Active High). When this pin is low, the chip is in shutdown mode. 7, 8, 11, 15 9, GND (Exposed Pad) 13 (Exposed Pad) Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. Over Voltage Protection Sense Input. The PWM Boost converter turns off when VOVP goes higher than 1.2V. Soft-Start Time Setting. A minimum 10nF capacitor is required for soft-start. Switch Node of PWM Boost Converter. 9 7 OVP 10 8 SS 12 10 SW 13 11 CREG Regulator Output for Internal Circuit. Placed a 1F capacitor to stabilize the 5V output regulator. 14 12 VCC Power Supply Voltage Input. For good bypass, a low ESR capacitor is required. Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS8463-01 August 2014 RT8463 Function Block Diagram SW VCC 4.5V 5V LDO OSC - S + CREG R OVP + 1.2V EN R + + Shutdown - - 1.4V VC ISN ISP GM + 5µA SS 1.2V + DCTL + - - GND ACTL VISP – VISN (mV) 100 0 0.2 1.2 VACTL (V) Figure 1 Operation The RT8463 is specifically designed to be operated in Buck, Boost and Buck-Boost converter applications. This device uses a fixed frequency, current mode control scheme to provide excellent line and load regulations. The control loop has a current sense amplifier to sense the voltage between the ISP and ISN pins and provides an output voltage at the VC pin. A PWM comparator then turns off the internal power switch when the sensed power switch current exceeds the compensated VC pin voltage. The power switch will not reset by the oscillator clock in each cycle. If the comparator does not turn off the switch in a cycle, the power switch is on for more than a full Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS8463-01 August 2014 switching period until the comparator is tripped. In this manner, the programmed voltage across the sense resistor is regulated by the control loop. The current through the sense resistor is set by the programmed voltage and the sense resistance. The voltage across the sense resistor can be programmed by either the analog or PWM signals at the ACTL pin, or the PWM signal at the DCTL pin. The RT8463 provides protection functions which include over temperature, input voltage under voltage, output voltage over voltage, and switch current limit. is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT8463 Absolute Maximum Ratings (Note 1) Supply Input Voltage, VCC ------------------------------------------------------------------------------------ −0.3V to 60V SW Pin Voltage at Switching Off, ISP, ISN ---------------------------------------------------------------- −0.3V to 60V DCTL, ACTL, CREG, OVP Pin Voltage -------------------------------------------------------------------- −0.3V to 5.5V (Note 2) EN Pin Voltage --------------------------------------------------------------------------------------------------- −0.3V to 20V Power Dissipation, PD @ TA = 25°C TSSOP-14 (Exposed Pad) ------------------------------------------------------------------------------------ 3.32W WDFN-12L 3x3 --------------------------------------------------------------------------------------------------- 3.28W Package Thermal Resistance (Note 3) TSSOP-14 (Exposed Pad), θJA ------------------------------------------------------------------------------ 30.1°C/W TSSOP-14 (Exposed Pad), θJC ------------------------------------------------------------------------------ 7.5°C/W WDFN-12L 3x3, θJA --------------------------------------------------------------------------------------------- 30.5°C/W WDFN-12L 3x3, θJC --------------------------------------------------------------------------------------------- 7.5°C/W Junction Temperature ------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------- 260°C Storage Temperature Range ---------------------------------------------------------------------------------- −65°C to 150°C ESD Susceptibility (Note 4) HBM (Human Body Model) ------------------------------------------------------------------------------------ 2kV MM (Machine Model) ------------------------------------------------------------------------------------------- 200V Recommended Operating Conditions (Note 5) Supply Input Voltage, VCC ------------------------------------------------------------------------------------ 4.5V to 50V Junction Temperature Range ---------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range ---------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics (VCC = 12V, No Load on any Output, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 4.5 5 5.5 V mA Overall Regulator Output Voltage VCREG ICREG = 20mA Supply Current IVCC VC 0.2V (Not Switching ) -- -- 5 VIN Under Voltage Lockout Threshold VUVLO VIN Rising -- 4.2 -- VIN Falling -- 3.8 -- Shutdown Current ISHDN VEN < 0.5V -- -- 15 EN Input Voltage Logic-High VEN_H 2 -- -- Logic-Low VEN_L -- -- 0.5 VEN > 2V -- -- 1 VACTL 1.25V 96 100 102 VACTL = 1.2V 95 98 101 EN Input Current V A V A Current Sense Amplifier Input Threshold (VISP VISN) Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 mV is a registered trademark of Richtek Technology Corporation. DS8463-01 August 2014 RT8463 Parameter Symbol Test Conditions Min Typ Max Unit Input Current IISP VISP = 24V -- 200 -- A Input Current IISN VISN = 24V -- 20 -- A Output Current IVC 2V > VC > 0.2V -- 10 -- A -- 0.2 -- V VC Threshold for PWM Switch Off LED Dimming Analog Dimming ACTL Pin Input Current IACTL 0 VACTL 3V, DCTL Floating -- -- 2 A LED Current On Threshold at ACTL VACTL_ON (VISP VISN) = 100mV -- 1.2 1.33 V LED Current Off Threshold at ACTL VACTL_OFF -- 0.2 0.25 V DCTL Input Current IDCTL -- 0.5 2 A DCTL Input Voltage 0.3V VDCTL 5V Logic-High VDCTL_H 2 -- -- Logic-Low VDCTL_L -- -- 0.1 420 470 520 kHz -- -- 100 % -- 150 250 ns -- 0.3 0.5 2 2.5 -- A 1.15 1.2 1.25 V V PWM Boost Converter Switching Frequency fSW Maximum Duty Cycle D MAX Minimum On-Time (Note 6) SW RDS(ON) SW Current Limit ILIM_SW OVP and Soft-Start OVP Threshold VOVP OVP Input Current IOVP VOVP 1.5V -- -- 50 nA Soft-Start SS Pin Current ISS VSS 2.5V -- 5 8 A Temperature Protection Thermal Shutdown Temperature TSD -- 150 -- C Thermal Shutdown Hysteresis TSD -- 20 -- C Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability. Note 2. If connected with a 20kΩ serial resistor, ACTL and DCTL can go up to 40V. Note 3. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is measured at the exposed pad of the package. Note 4. Devices are ESD sensitive. Handling precaution is recommended. Note 5. The device is not guaranteed to function outside its operating conditions. Note 6. Guaranteed by design, not subjected to production test. Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS8463-01 August 2014 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT8463 Typical Application Circuit D1 VIN 4.5V to 50V C1 RT8463 ISP VCC EN 5V R4 GND VC R1 10k CREG SS ACTL C3 10nF C2 3.3nF R3 ISN OVP DCTL PWM Dimming control R2 100mV C6 C5 1µF L 22µH SW C4 0.47µF Figure 2. PWM to Analog Dimming Buck Configuration D1 VIN 4.5V to 50V C1 RT8463 ISP VCC Analog Dimming ACTL ISN DCTL OVP CREG VC R1 10k C2 3.3nF R3 R4 GND EN 5V R2 100mV SS C6 C5 1µF L 15µH SW C3 10nF Figure 3. Analog Dimming Buck Configuration D1 VIN 4.5V to 50V C1 RT8463 VCC ISP PWM Dimming control ACTL ISN OVP 5V EN DCTL VC R1 10k C2 3.3nF R3 GND CREG SS C3 10nF R2 100mV R4 C6 C5 1µF L 15µH SW Figure 4. PWM Dimming Buck Configuration Through ACTL Pin Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DS8463-01 August 2014 RT8463 L 15µH VIN 4.5V to 50V D1 C1 C6 1µF RT8463 SW VCC EN 5V CREG VC R1 10k SS C2 3.3nF ACTL C3 10nF R2 100mV ISP ISN GND DCTL PWM Dimming control VOUT 50V (Max.) C5 1µF R3 OVP VOUT R4 C4 0.47µF Figure 5. PWM to Analog Dimming Boost Configuration C6 D1 L VIN 4.5V to 50V 15µH C1 VOUT 50V (Max.) RT8463 5V VCC SW EN ISP DCTL PWM Dimming control VC R1 10k SS C2 3.3nF ISN GND CREG ACTL C3 10nF R2 100mV C5 1µF OVP C4 0.47µF R3 VOUT R4 Figure 6. PWM to Analog Dimming Buck-Boost Configuration Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS8463-01 August 2014 is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT8463 Typical Operating Characteristics Supply Current vs. Temperature 2.2 2.0 2.0 Supply Current (mA) Supply Current (mA) Supply Current vs. VCC 2.5 1.5 1.0 0.5 1.8 1.6 1.4 VCC = 12V 1.2 0.0 0 5 10 15 20 25 30 35 40 45 -50 50 -25 0 25 50 75 100 125 Temperature (°C) VCC (V) Shutdown Current vs. VCC ISP-ISN Threshold vs. Temperature 8.0 130 ISP-ISN Threshold (mV) Shutdown Current (μA)1 7.5 7.0 6.5 6.0 5.5 5.0 4.5 118 106 94 82 VIN = 12V 4.0 70 0 10 20 30 40 50 -50 -25 0 VCC (V) Efficiency vs. Input Voltage 100 50 75 100 125 Efficiency vs. Input Voltage 100 Boost Buck 95 Efficiency (%) 95 Efficiency (%) 25 Temperature (°C) 90 85 80 90 85 80 VOUT = 30V, IOUT = 210mA 75 VOUT = 15V, IOUT = 210mA 75 5 10 15 20 25 Input Voltage (V) Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 30 15 18 21 24 27 30 Input Voltage (V) is a registered trademark of Richtek Technology Corporation. DS8463-01 August 2014 RT8463 IOUT vs. VACTL Efficiency vs. Input Voltage 100 240 Buck-Boost 210 180 90 I OUT (mA) Efficiency (%) 95 85 150 120 90 60 80 30 VOUT = 15V, IOUT = 210mA VOUT = 30V, IOUT = 210mA 0 75 4 6 8 10 12 14 16 18 0 20 0.3 0.6 0.9 1.2 1.5 VACTL (V) Input Voltage (V) VOVP vs. Temperature IOUT vs. VDCTL 1.4 240 210 1.3 180 1.2 VOVP (V) I OUT (mA) 150 120 90 1.1 1.0 60 0.9 30 VOUT = 30V, IOUT = 210mA, f = 100Hz VCC = 12V 0.8 0 0 10 20 30 40 50 60 70 80 90 -50 100 -25 0 Frequency vs. VCC 50 75 100 125 SS Current vs. Temperature 480 6.2 470 5.8 SS Current (µA) Frequency (kHz)1 25 Temperature (°C) PWM Duty (%) 460 450 440 5.4 5.0 4.6 430 VCC = 12V 420 4.2 0 5 10 15 20 25 30 35 40 45 VCC (V) Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS8463-01 August 2014 50 -50 -25 0 25 50 75 100 125 Temperature (°C) is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT8463 Power Off from VIN Power On from VIN IOUT (200mA/Div) IOUT (200mA/Div) VOUT (20V/Div) VOUT (20V/Div) VIN (10V/Div) VIN (10V/Div) Time (25ms/Div) Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 Time (250ms/Div) is a registered trademark of Richtek Technology Corporation. DS8463-01 August 2014 RT8463 Application Information Loop Compensation Output Over Voltage Setting The RT8463 has an external compensation pin (VC) allowing the loop response optimized for specific application. An external resistor in series with a capacitor is connected from the VC pin to GND to provide a pole and a zero for proper loop compensation. The recommended compensation resistance and capacitance for the RT8463 are 10kΩ and 3.3nF. The RT8463 is equipped with Over Voltage Protection (OVP) function. When the voltage at OVP pin exceeds a threshold of approximately1.2V, the power switch is turned off. The power switch can be turned on again once the voltage at OVP pin drops below 1.2V. Soft-Start The soft-start can be achieved by connecting a capacitor from the SS pin to GND. The built-in soft-start circuit reduces the start-up current spike and output voltage overshoot. The soft-start time is determined by the external capacitor charged by an internal 5μA constant charging current. The SS pin directly limits the slew rate of voltage on the VC pin, which in turn limits the peak switch current. The value of the soft-start capacitor is user defined to satisfy the designer's requirements. LED Current Setting The LED current could be calculated by the following equation : For the Boost application, the output voltage could be clamped at a certain voltage level. The OVP voltage can be set by the following equation : R3 ) R4 where R3 and R4 are the voltage divider from VOUT to GND with the divider center node connected to the OVP pin. VOUT_OVP = 1.2 (1 + Current Limit Protection The RT8463 can limit the peak switch current by the internal over current protection feature. In normal operation, the power switch is turned off when the switch current reaches the loop-set value. The maximum peak-current limit of the switch is 2.5A (typ.). Over Temperature Protection V (ISP ISN) ILED(MAX) = R2 where V (ISP − ISN) is the voltage between ISP and ISN (100mV typ. if ACTL or DCTL dimming is not applied) and the R2 is the resister between ISP and ISN. The RT8463 provides Over Temperature Protection (OTP) function to prevent the excessive power dissipation from overheating. The OTP function will shut down switching operation when the die junction temperature exceeds 150°C. The chip will automatically start to switch again when the die junction temperature cools off. Brightness / Dimming Control Inductor Selection The RT8463 features both analog and digital dimming control. Analog dimming is linearly controlled by an external voltage (0.2V < VACTL < 1.2V). With an on-chip Choose an inductor that can handle the necessary peak current without saturating, and ensure that the inductor has a low DCR (copper wire resistance) to minimize I2R power losses. Inductor manufacturers specify the maximum current rating as the current where the inductance falls to certain percentage of its nominal value (65% typ.). output clamping amplifier and a resistor, PWM dimming signal fed at DCTL pin can be easily filtered to an analog dimming signal with an external capacitor from the ACTL pin to GND for noise-free PWM dimming. A very high contrast ratio true digital PWM dimming can be achieved by driving the ACTL pin with a PWM signal from 100Hz to 10kHz. Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS8463-01 August 2014 is a registered trademark of Richtek Technology Corporation. www.richtek.com 11 RT8463 Table 1. Relevant Parameters for Buck, Boost, and Buck − Boost Topologies Buck Boost Buck Boost Duty Cycle : D VOUT VIN VF VOUT VIN VF VOUT VF VOUT VF VIN VOUT VF Average Inductor Current : IL IOUT IOUT 1 D IOUT 1 D I (A) VOUT VF (1 D) L fSW VOUT VF D (1 D) L fSW VOUT VF (1 D) L fSW VOUT VF (1 D) IOUT L fSW VOUT VF D (1 D)2 IOUT L fSW VOUT VF (1 D)2 IOUT L fSW IOUT (1 ) 1 D 2 IOUT (1 ) 1 D 2 VOUT VF D (1 D)2 IOUT fSW VOUT VF (1 D)2 IOUT fSW I (A) IL IPK (A) = IL (1 2 ) L (H) IOUT (1 2 ) VOUT VF (1 D) IOUT fSW γ : Current ripple ratio, set γ = 1 for typical peak current disign. fSW : Switch Frequency VF : Forward voltage drop of the output rectifier. VIN : Nominal input voltage. VOUT : Desired output voltage. IOUT : Desired output current. IPK : Peak current of Inductor. L : Minimum Desired Inductor value. Table1, shows the relevant parameters for Buck, Boost and Buck − Boost topologies. The first column is for the basic definition of the terms. Schottky Diode Selection The Schottky diode, with low forward voltage drop and fast switching speed, is necessary for the RT8463 applications. In addition, power dissipation, reverse voltage rating and pulsating peak current are the important parameters of the Schottky diode that must be considered. Choose a suitable Schottky diode whose reverse voltage rating is greater than the maximum output voltage. The diode's average current rating must exceed the average output current. The diode conducts current only when the power switch is turned off (typically less than 50% duty cycle). Capacitor Selection The peak inductor current depends on the different topologies. For a Buck converter the average value of the inductor current equals the load current, irrespective of the input voltage. When as the input increases, the peak current increases. The input capacitor reduces current spikes from the input supply and minimizes noise injection to the converter. For most RT8463 applications, a 4.7μF ceramic capacitor is sufficient. A higher or lower value may be used depending on the noise level from the input supply and the input current to the converter. The inductor must be selected with a saturation current rating greater than the peak current limit. In Boost application, the output capacitor is typically a ceramic capacitor and is selected based on the output voltage ripple requirements. The minimum value of the output capacitor, COUT, is approximately given by the following equation : I D T COUT = LED VRIPPLE Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 12 is a registered trademark of Richtek Technology Corporation. DS8463-01 August 2014 RT8463 Maximum Power Dissipation (W)1 Thermal Considerations For continuous operation, do not exceed absolute maximum junction temperature. The maximum power dissipation depends on the thermal resistance of the IC package, PCB layout, rate of surrounding airflow, and difference between junction and ambient temperature. The maximum power dissipation can be calculated by the following formula : PD(MAX) = (TJ(MAX) − TA) / θJA where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction to ambient thermal resistance. For recommended operating condition specifications, the maximum junction temperature is 125°C. The junction to ambient thermal resistance, θJA, is layout dependent. For TSSOP-14 (Exposed Pad) package, the thermal resistance, θJA, is 30.1°C/W on a standard JEDEC 51-7 four-layer thermal test board. For WDFN-12L 3x3 package, the thermal resistance, θJA, is 30.5°C/W on a standard JEDEC 51-7 four-layer thermal test board. The maximum power dissipation at TA = 25°C can be calculated by the following formula : The maximum power dissipation depends on the operating ambient temperature for fixed T J(MAX) and thermal resistance, θJA. The derating curve in Figure 7 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS8463-01 August 2014 Four-Layer PCB 3.0 TSSOP-14 (Exposed Pad) 2.5 WDFN-12L 3x3 2.0 1.5 1.0 0.5 0.0 0 25 50 75 100 125 Ambient Temperature (°C) Figure 7. Derating Curve of Maximum Power Dissipation Layout Consideration PCB layout is very important to design power switching converter circuits. The recommended layout guidelines are listed as follows : The power components L1, D1, CVIN, and COUT must be placed as close to each other as possible to reduce the ac current loop area. The PCB trace between power components must be as short and wide as possible due to large current flow through these traces during operation. Place L1 and D1 connected to SW pin as close as possible. The trace should be as short and wide as possible. The input capacitors C1 must be placed as close to VCC pin as possible. Place the compensation components to the VC pin as close as possible to avoid noise pick up. PD(MAX) = (125°C − 25°C) / (30.1°C/W) = 3.32W for TSSOP-14 (Exposed Pad) package PD(MAX) = (125°C − 25°C) / (30.5°C/W) = 3.28W for WDFN-12L 3x3 package 3.5 is a registered trademark of Richtek Technology Corporation. www.richtek.com 13 RT8463 Place these components as close as possible. D1 COUT L1 GND C1 GND RSENS : : : : RVC CVC VIN ISP 1 12 VCC ISN 2 11 CREG VC 3 10 SW ACTL 4 9 GND DCTL 5 8 SS EN 6 7 OVP GND Grand Plane CVIN C5 GND Locate input capacitor to VCC as close as possible. CSS GND Locate the compensation components to VC pin as close as possible. Figure 8. PCB Layout Guide for WDFN-12L 3x3 Copyright © 2014 Richtek Technology Corporation. All rights reserved. www.richtek.com 14 is a registered trademark of Richtek Technology Corporation. DS8463-01 August 2014 RT8463 Outline Dimension Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.000 1.200 0.039 0.047 A1 0.000 0.150 0.000 0.006 A2 0.800 1.050 0.031 0.041 b 0.190 0.300 0.007 0.012 D 4.900 5.100 0.193 0.201 e 0.650 0.026 E 6.300 6.500 0.248 0.256 E1 4.300 4.500 0.169 0.177 L 0.450 0.750 0.018 0.030 U 1.900 2.900 0.075 0.114 V 1.600 2.600 0.063 0.102 14-Lead TSSOP (Exposed Pad) Plastic Package Copyright © 2014 Richtek Technology Corporation. All rights reserved. DS8463-01 August 2014 is a registered trademark of Richtek Technology Corporation. www.richtek.com 15 RT8463 2 1 2 1 DETAIL A Pin #1 ID and Tie Bar Mark Options Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated. Symbol D2 Dimensions In Millimeters Min. Max. Min. Max. A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.175 0.250 0.007 0.010 b 0.150 0.250 0.006 0.010 D 2.950 3.050 0.116 0.120 Option1 2.300 2.650 0.091 0.104 Option2 1.970 2.070 0.078 0.081 2.950 3.050 0.116 0.120 Option1 1.400 1.750 0.055 0.069 Option2 1.160 1.260 0.046 0.050 E E2 Dimensions In Inches e L 0.450 0.350 0.018 0.450 0.014 0.018 W-Type 12L DFN 3x3 Package Richtek Technology Corporation 14F, No. 8, Tai Yuen 1st Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries. www.richtek.com 16 DS8463-01 August 2014