® RT5784A/B 2A, 6V, 1.5MHz, 25μ μA IQ, ACOTTM Synchronous Step-Down Converter General Description Features The RT5784A/B is a high-performance, Advanced Constant On-Time (ACOTTM) monolithic synchronous step-down DC/DC converter that can deliver up to 2A output current from a 2.5V to 6V input supply. The proprietary ACOT control architecture features quick transient response and provides stable operation with small ceramic output capacitors and without complicated external compensation. The switching ripple voltage is easily smoothed-out by small package filtering elements due to a constant switching frequency of 1.5MHz and the maximum duty cycle of 100% allows the device to operate at low dropout use. With internal low on-resistance power switches and extremely low quiescent current, the RT5784A/B displays excellent efficiency and good behavior across a range of applications. Dramatically Fast Transient Response Steady 1.5MHz ±200kHz Switching Frequency Very Low Input Quiescent and Shutdown Currents Advanced COT Control Loop Design Optimized for Ceramic Output Capacitors 2.5V to 6V Input Voltage Range Accurate Voltage Reference 0.6V ±2% Integrated 100mΩ Ω/60mΩ Ω MOSFETs Internal Start-Up into Pre-biased Outputs Power Good Indicator Enable Control Over-Current and Over-Temperature Protections Under-Voltage Protection with Hiccup Mode RoHS Compliant and Halogen Free Applications Cycle-by-cycle current limit provides protection against shorted outputs, input under-voltage lock-out, output under-voltage protection, and thermal shutdown provide safe and smooth operation in all operating conditions. The RT5784A/B is available in the WDFN-8JL 2x1.5 (FC) package. Mobile Phones and Handheld Devices STB, Cable Modem, and xDSL Platforms WLAN ASIC Power / Storage (SSD and HDD) General Purpose for POL LV Buck Converter Simplified Application Circuit VIN VIN RPGOOD PGOOD Enable LX CIN VOUT R1 RT5784A/B PGOOD L CFF COUT FB R2 EN VOUT PGND Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS5784A/B-02 January 2016 AGND is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT5784A/B Ordering Information Pin Configurations RT5784 (TOP VIEW) Package Type QWF : WDFN-8JL 2x1.5 (FC) (W-Type) EN FB AGND VOUT Lead Plating System G : Green (Halogen Free and Pb Free) PSM/PWM A : PSM/PWM B : Force-PWM 1 8 2 7 3 6 4 5 PGOOD VIN LX PGND WDFN-8JL 2x1.5 (FC) Note : Marking Information Richtek products are : RT5784AGQWF ments of IPC/JEDEC J-STD-020. 01 : Product Code RoHS compliant and compatible with the current require- 01W W : Date Code Suitable for use in SnPb or Pb-free soldering processes. RT5784BGQWF 00 : Product Code 00W W : Date Code Functional Pin Description Pin No. Pin Name Pin Function 1 EN Enable Control Input. Connecting this pin to logic high can enable the device and connecting this pin to GND can disable the device. 2 FB Feedback Voltage Input. This pin is used to set the desired output voltage via an external resistive divider. The feedback reference voltage is 0.6V typically. 3 AGND Analog Ground. Provides the ground return path for control circuitry and internal reference. 4 VOUT Output Voltage Sense Input. This pin is used to monitor and adjust output voltage for superior load transient regulation. 5 PGND Power Ground. This pin must be soldered to a large PCB and connected to analog ground for maximum power dissipation. 6 LX Switch Node. LX is the switching node that supplies power to the output and connect the output LC filter from LX to the output load. 7 VIN Supply Input. Supplies the power to the internal control circuit as well as the power switches of the device. Drive VIN with a 2.5V to 6V power source and bypass VIN to PGND with a suitably large capacitor to eliminate noise on the input to the IC. 8 PGOOD Power Good Indicator Output. This pin is an open-drain logic output that is pulled to ground when the output voltage is lower or higher than its specified threshold under the conditions of UVP, OTP, dropout, EN shutdown, or during slow start. Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS5784A/B-02 January 2016 RT5784A/B Function Block Diagram VOUT EN UVLO OTP FB AGND Shutdown Control Error Amplifier + + VREF TON Comparator + - Ramp Generator Logic Control Current Limit Detector PGOOD + AZC VFB LX VIN Driver LX LX LX PGND - Operation The RT5784A/B is a low voltage synchronous step-down converter that can support input voltage ranging from 2.5V to 6V and the output current can be up to 2A. The RT5784A/ B uses ACOTTM mode control. To achieve good stability with low-ESR ceramic capacitors, the ACOT uses a virtual inductor current ramp generated inside the IC. This internal ramp signal replaces the ESR ramp normally provided by the output capacitor's ESR. The ramp signal and other internal compensations are optimized for low-ESR ceramic output capacitors. In steady-state operation, the feedback voltage, with the virtual inductor current ramp added, is compared to the reference voltage. When the combined signal is less than the reference, the on-time one-shot is triggered, as long as the minimum off-time one-shot is clear and the measured inductor current (through the synchronous rectifier) is below the current limit. The on-time one-shot turns on the high-side switch and the inductor current ramps up linearly. After the on-time, the high-side switch is turned off and the synchronous rectifier is turned on and the inductor current ramps down linearly. At the same time, the minimum off-time one-shot is triggered to prevent Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS5784A/B-02 January 2016 another immediate on-time during the noisy switching time and allow the feedback voltage and current sense signals to settle. The minimum off-time is kept short so that rapidly-repeated on-times can raise the inductor current quickly when needed. Under-Voltage Protection (UVLO) The UVLO continuously monitors the VCC voltage to make sure the device works properly. When the VCC is high enough to reach the UVLO high threshold voltage, the step-down converter softly starts or pre-bias to its regulated output voltage. When the VCC decreases to its low threshold voltage, the device shuts down. Power Good When the output voltage is higher than PGOOD rising threshold, the PGOOD flag is high. Output Under-Voltage Protection (UVP) When the output voltage is lower than 66% reference voltage after soft-start, the UVP is triggered. is a registered trademark of Richtek Technology Corporation. www.richtek.com 3 RT5784A/B Over-Current Protection (OCP) The RT5784A/B senses the current signal when the highside and low-side MOSFET turns on. As a result, The OCP is a cycle-by-cycle current limit. If an over-current condition occurs, the converter turns off the next on pulse until inductor current drops below the OCP limit. The delay time of high-side MOSFET OCP trigger is 100ns. If the OCP is continually activated and the load current is larger than the current provided by the converter, the output voltage drops. Also, when the output voltage triggers the UVP also, the current will drop to ZC and trigger the resoft-start sequence. Soft-Start An internal current source charges an internal capacitor to build the soft-start ramp voltage. The typical soft-start time is 1.5ms. Over-Temperature Protection (OTP) The RT5784A/B has an over-temperature protection. When the device triggers the OTP, the device shuts down until the temperature is back to normal. PWM Frequency and Adaptive On-Time Control The on-time can be roughly estimated by the equation : TON = VOUT 1 where fOSC is nominal 1.5MHz VIN fOSC Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 4 is a registered trademark of Richtek Technology Corporation. DS5784A/B-02 January 2016 RT5784A/B Absolute Maximum Ratings (Note 1) Supply Input Voltage, VIN ----------------------------------------------------------------------------------------LX Pin Switch Voltage ---------------------------------------------------------------------------------------------<10ns -----------------------------------------------------------------------------------------------------------------Other Pins ------------------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C WDFN-8JL 2x1.5 (FC) ---------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2) WDFN-8JL 2x1.5 (FC), θJA ----------------------------------------------------------------------------------------Junction Temperature ----------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------ESD Susceptibility (Note 3) HBM (Human Body Model) ---------------------------------------------------------------------------------------- Recommended Operating Conditions −0.3V to 7V −0.3V to 7.3V −5V to 8.5V −0.3V to 5V 0.91W 110°C/W 150°C 260°C −65°C to 150°C 2kV (Note 4) Supply Input Voltage, VIN ----------------------------------------------------------------------------------------- 2.5V to 6V Junction Temperature Range -------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics (VIN = 5V, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Supply Voltage Input Operating Voltage VIN 2.5 -- 6 Under-Voltage Lockout Threshold Rising VUVLO 2.15 2.3 2.45 Under-Voltage Lockout Threshold Hysteresis ∆VUVLO -- 260 -- mV Shutdown Current ISHDN VEN = 0V -- 0 1 A Quiescent Current IQ For RT5784A VLX no switching. RT5784B --- 25 600 --- A VIH VEN Rising 1.2 -- -- VIL VEN Falling -- -- 0.4 Feedback Voltage VFB 2.5V VIN 6V 0.588 0.6 0.612 V Feedback Input Current IFB VFB = 0.6V -- 10 -- nA 2.8 3.2 4.2 V Enable Voltage Enable Threshold Voltage V Feedback Voltage Current Limit High-Side Switch Peak Current Limit ILIM_H Low-Side Switch Valley Current Limit ILIM_L A Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS5784A/B-02 January 2016 2 2.5 3.4 is a registered trademark of Richtek Technology Corporation. www.richtek.com 5 RT5784A/B Parameter Symbol Test Conditions Min Typ Max Unit 1300 1500 1700 kHz -- 60 -- Switching Switching Frequency fS VOUT = 1.2V Minimum Off-Time Internal MOSFET High-Side On-Resistance RDS(ON)_H -- 100 -- Low-Side On-Resistance RDS(ON)_L -- 60 -- VEN = 0V, VIN = 6V, VLX = 0V and 5.5V -- 0 1 A EN from low to high and VOUT is meet 95% -- 1.7 -- ms Power Good Rising Threshold VFB Rising (Good) -- 95 -- VFB Rising (Fault) -- 110 -- Power Good Falling Threshold VFB Falling (Fault) -- 90 -- VFB Falling (Good) -- 105 -- -- 50 -- s -- -- 0.4 V -- 550 -- k 4.9 -- -- V Switch Leakage Current m Soft-Start Fixed Soft-Start Time tSS Power Good Power Good Enable Delay Time Power Good Sink Current Capability Power Good Internal Resistance Power Good Asserting Voltage IPGOOD sinks 1mA VPGOOD VIN = 5V, VFB = 0.6V (Note 5) %VFB Over-Temperature Protection Thermal Shutdown TSD (Note 5) -- 150 -- Thermal Shutdown Hysteresis ∆TSD (Note 5) -- 30 -- 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. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. The first layer of copper area is filled. θJC is measured at the exposed pad of the package. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. Guaranteed by design. Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 6 is a registered trademark of Richtek Technology Corporation. DS5784A/B-02 January 2016 RT5784A/B Typical Application Circuit VIN 2.5V to 6V 7 RPGOOD 100k CIN 10µF LX 6 L VOUT R1 RT5784A/B 8 PGOOD VIN PGOOD FB 2 R2 1 EN Enable CFF COUT 10µF VOUT 4 PGND 5 AGND 3 Table 1. Suggested Component Values VOUT (V) R1 (k) R2 (k) L (H) COUT (F) 1 200 300 1 10 1.2 200 200 1 10 1.8 200 100 1.4 10 2.5 200 63.2 1.4 10 3.3 200 44.2 1.4 10 Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS5784A/B-02 January 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 7 RT5784A/B Typical Operating Characteristics Efficiency vs. Output Current Output Voltage vs. Output Current 100 1.40 90 VIN = 3.3V VIN = 4V VIN = 5V VIN = 5.5V VIN = 6V 70 60 50 1.35 Output Voltage (V) Efficiency (%) 80 40 30 20 1.30 VIN = 3.3V VIN = 4V VIN = 5V VIN = 5.5V VIN = 6V 1.25 1.20 10 VOUT = 1.2V 0 0.001 VOUT = 1.2V 1.15 0.01 0.1 1 10 0 0.5 Output Current (A) 1 1.5 2 Output Current (A) UVLO Threshold vs. Temperature EN Threshold vs. Temperature 2.5 1.00 Rising EN Threshold (V) UVLO Threshold (V) 0.90 2.3 2.1 Falling 1.9 0.80 Falling 0.70 Rising 0.60 0.50 1.7 0.40 VOUT = 1.2V, IOUT = 0A VOUT = 1.2V, IOUT = 1A 1.5 0.30 -50 -25 0 25 50 75 100 125 -50 -25 0 Temperature (°C) 25 50 75 100 125 Temperature (°C) Output Voltage vs. Temperature Output Voltage vs. Temperature 1.24 3.40 3.39 3.38 Output Voltage (V) Output Voltage (V) 1.23 1.22 1.21 1.20 1.19 3.37 3.36 3.35 3.34 3.33 3.32 3.31 3.30 VOUT = 1.2V, IOUT = 1A 1.18 3.29 VOUT = 3.3V, IOUT = 1A 3.28 -50 -25 0 25 50 75 100 Temperature (°C) Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 8 125 -50 -25 0 25 50 75 100 125 Temperature (°C) is a registered trademark of Richtek Technology Corporation. DS5784A/B-02 January 2016 RT5784A/B Reference Voltage vs. Temperature Soft-Start Time vs. Temperature 0.618 1.66 Soft-Start Time (ms) Reference Voltage (V) 1.64 0.612 0.606 0.600 0.594 0.588 VIN = 5V 0.582 1.62 1.60 1.58 1.56 1.54 1.52 1.50 1.48 VIN = 5V, VOUT = 3.3V 1.46 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 Temperature (°C) temperature (°C) Load Transient Response Output Ripple Voltage VOUT (20mV/Div) VOUT (20mV/Div) IOUT (1A/Div) VLX (2V/Div) VIN = 5V, VOUT = 1.2V, IOUT = 1A to 2A, L = 1μH 100 125 VIN = 5V, VOUT = 1.2V, IOUT = 2A, L = 1μH Time (100μs/Div) Time (400ns/Div) Power On from VIN Power Off from VIN VIN (4V/Div) VIN (4V/Div) VOUT (1V/Div) VOUT (1V/Div) VLX (5V/Div) VLX (5V/Div) ILX (1A/Div) ILX (1A/Div) VIN = 5V, VOUT = 1.2V, IOUT = 2A, L = 1μH VIN = 5V, VOUT = 1.2V, IOUT = 2A, L = 1μH Time (2ms/Div) Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS5784A/B-02 January 2016 Time (5ms/Div) is a registered trademark of Richtek Technology Corporation. www.richtek.com 9 RT5784A/B Power On from EN EN (2V/Div) EN (2V/Div) VOUT (1V/Div) VOUT (1V/Div) VLX (5V/Div) VLX (5V/Div) ILX (1A/Div) ILX (1A/Div) VIN = 5V, VOUT = 1.2V, IOUT = 2A, L = 1μH Time (2ms/Div) Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 10 Power Off from EN VIN = 5V, VOUT = 1.2V, IOUT = 2A, L = 1μH Time (40μs/Div) is a registered trademark of Richtek Technology Corporation. DS5784A/B-02 January 2016 RT5784A/B Application Information The RT5784A/B is a single-phase step-down converter. Advance Constant-on-Time (ACOT) with fast transient response. An internal 0.6V reference allows the output voltage to be precisely regulated for low output voltage applications. A fixed switching frequency (1.5MHz) oscillator and internal compensation are integrated to minimize external component count. Protection features include over current protection, under voltage protection and over temperature protection. Inductor Selection The consideration of inductor selection includes inductance, RMS current rating and, saturation current rating. The inductance selection is generally flexible and is optimized for the low cost, low physical size, and high system performance. Choosing lower inductance to reduce physical size and cost, and it is useful to improve the transient response. However, it causes the higher inductor peak current and output ripple voltage to decrease system efficiency. Conversely, higher inductance increase system efficiency, but the physical size of inductor will become larger and transient response will be slow because more transient time is required to change current (up or down) by inductor. A good compromise between size, efficiency, and transient response is to set a inductor ripple current (ΔIL) about 20% to 50% of the desired full output load current. Calculate the approximate inductance by the input voltage, output voltage, switching frequency (fSW), maximum rated output current (IOUT(MAX)) and inductor ripple current (ΔIL). L= VOUT ( VIN VOUT ) VIN fSW IL Once the inductance is chosen, the inductor ripple current (ΔIL) and peak inductor current can be calculated. For the typical operating circuit design, the output voltage is 1.2V, maximum rated output current is 2A, input voltage is 5V, and inductor ripple current is 0.6A which is 30% of the maximum rated output current, the calculated inductance value is : L= 1.2 5 1.2 5 1500 103 0.6 = 1μH The inductor ripple current set at 0.6A and so we select 1uH inductance. The actual inductor ripple current and required peak current is shown as below : IL = 1.2 5 1.2 5 1500 103 1 10-6 = 0.6A IL(PEAK) = IOUT(MAX) 1 IL = 2 + 0.6 = 2.3A 2 2 Inductor saturation current should be chosen over IC's current limit. Output Voltage Setting The output voltage is set by an external resistive divider according to the following equation : R1 ) R2 where VREF equals to 0.6V typical. The resistive divider allows the FB pin to sense a fraction of the output voltage as shown in Figure 1. VOUT VREF x (1 VOUT R1 FB RT5784A/B R2 GND Figure 1. Setting the Output Voltage VOUT VIN VOUT VIN fSW L IL(PEAK) = IOUT(MAX) 1 IL 2 IL(VALLY) = IOUT(MAX) 1 IL 2 IL = Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS5784A/B-02 January 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 11 RT5784A/B Low Supply Operation The RT5784A/B is designed to operate down to an input supply voltage of 2.5V. One important consideration at low input supply voltages is that the RDS(ON) of the PChannel and N-Channel power switches increases. The user should calculate the power dissipation when the RT5784A/B is used at 100% duty cycle with low input voltages to ensure that thermal limits are not exceeded. Under Voltage Protection (UVP) Hiccup Mode For the RT5784A/B, it provides Hiccup Mode Under Voltage Protection (UVP). When the output voltage is lower than 66% reference voltage after soft-start, the UVP is triggered. If the UVP condition remains for a period, the RT5784A/B will retry automatically. When the UVP condition is removed, the converter will resume operation. The UVP is disabled during soft-start period. Post Short VIN (2V/Div) VOUT (500mV/Div) SW (5V/Div) IOUT (2A/Div) VIN = 5V, VOUT = 1.2V, L = 1μH Time (1ms/Div) CIN and COUT Selection The input capacitance, C IN, is needed to filter the trapezoidal current at the source of the top MOSFET. To prevent large ripple voltage, a low ESR input capacitor sized for the maximum RMS current should be used. RMS current is given by : IRMS IOUT(MAX) VOUT VIN VIN 1 VOUT This formula has a maximum at VIN = 2VOUT, where IRMS = IOUT / 2. This simple worst case condition is commonly used for design because even significant deviations do Copyright © 2016 Richtek Technology Corporation. All rights reserved. www.richtek.com 12 not result in much difference. Choose a capacitor rated at a higher temperature than required. Several capacitors may also be paralleled to meet size or height requirements in the design. The selection of COUT is determined by the effective series resistance (ESR) that is required to minimize voltage ripple and load step transients, as well as the amount of bulk capacitance that is necessary to ensure that the control loop is stable. Loop stability can be checked by viewing the load transient response. The output ripple, ΔVOUT, is determined by : 1 VOUT IL ESR 8fCOUT The output ripple is highest at maximum input voltage since ΔIL increases with input voltage. Multiple capacitors placed in parallel may be needed to meet the ESR and RMS current handling requirements. Dry tantalum, special polymer, aluminum electrolytic and ceramic capacitors are all available in surface mount packages. Special polymer capacitors offer very low ESR, but have lower capacitance density than other types. Tantalum capacitors have the highest capacitance density, but it is important to only use types that have been surge tested for use in switching power supplies. Aluminum electrolytic capacitors have significantly higher ESR, but can be used in cost-sensitive applications provided that consideration is given to ripple current ratings and long term reliability. Ceramic capacitors have excellent low ESR characteristics, but can have a high voltage coefficient and audible piezoelectric effects. The high Q of ceramic capacitors with trace inductance can also lead to significant ringing. Using Ceramic Input and Output Capacitors Higher value, lower cost ceramic capacitors are now becoming available in smaller case sizes. Their high ripple current, high voltage rating and low ESR make them ideal for switching regulator applications. However, care must be taken when these capacitors are used at the input and output. When a ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a load step at the output can induce ringing at the is a registered trademark of Richtek Technology Corporation. DS5784A/B-02 January 2016 RT5784A/B Table 1. Capacitors for CIN and COUT Component Supplier Part No. MuRata GRM31CR71A106KA01 Capacitance Case (F) Size 10F 1206 1.0 Maximum Power Dissipation (W)1 input, VIN. At best, this ringing can couple to the output and be mistaken as loop instability. At worst, a sudden inrush of current through the long wires can potentially cause a voltage spike at VIN large enough to damage the part. Four-Layer PCB 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 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 : 0 25 50 75 100 125 Ambient Temperature (°C) Figure 2. Derating Curve of Maximum Power Dissipation 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. The junction to ambient thermal resistance, θJA, is layout dependent. For WDFN-8JL 2x1.5 (FC) package, the thermal resistance, θJA, is 110°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 : PD(MAX) = (125°C − 25°C) / (110°C/W) = 0.91W for WDFN-8JL 2x1.5 (FC) package The maximum power dissipation depends on the operating ambient temperature for fixed T J(MAX) and thermal resistance, θJA. The derating curve in Figure 2 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. Copyright © 2016 Richtek Technology Corporation. All rights reserved. DS5784A/B-02 January 2016 is a registered trademark of Richtek Technology Corporation. www.richtek.com 13 RT5784A/B Outline Dimension 1 1 2 2 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 Dimensions In Millimeters Dimensions In Inches Min. Max. Min. Max. A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.150 0.250 0.006 0.010 b 0.200 0.300 0.008 0.012 D 1.900 2.100 0.075 0.083 E 1.400 1.600 0.055 0.063 e L 0.500 0.300 0.020 0.400 0.012 0.016 W-Type 8JL DFN 2x1.5 (FC) 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 14 DS5784A/B-02 January 2016