AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Description Pin Assignments ( Top View ) The AP7173 is a 1.5A low-dropout (LDO) linear regulator that features a user-programmable soft-start, an enable input and a power-good output. IN The soft-start reduces inrush current of the load capacitors and minimizes stress on the input power source during startup. The enable input and power-good output allow users to configure power management solutions that can meet the sequencing requirements of FPGAs, DSPs, and other applications with different start-up and power-down requirements. 1 10 OUT OUT FB IN 2 9 PG 3 8 VCC 4 7 SS EN 5 6 GND DFN3030-10 (Top View) The AP7173 is stable with any type of output capacitor of 2.2F or more. A precision reference and feedback control deliver 2% accuracy over load, line, and operating temperature ranges. The AP7173 is available in both DFN3030-10 and SO-8EP packages. IN 1 8 OUT PG 2 7 FB VCC 3 6 SS EN 4 5 GND SO-8EP Features Applications * * * * * Low VIN and wide VIN range: 1.0V to 5.5V Bias voltage (VVCC) range: 2.7V to 5.5V Low VOUT range: 0.8V to 3.3V Low dropout: 165mV typical at 1.5A, VVCC = 5V 2% accuracy over line, load and temperature range Power-Good (PG) output for supply monitoring and for sequencing of other supplies Programmable soft-start provides linear voltage startup Bias supply permits low VIN operation with good transient response Stable with any output capacitor 2.2F DFN3030-10 and SO-8EP: available in "Green" molding compound (No Br, Sb) Lead-free finish/ RoHS Compliant (Note 1) Note: PCs, Servers, Modems, and Set-Top-Boxes FPGA Applications DSP Core and I/O Voltages Post-Regulation Applications Applications With Sequencing Requirements 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. Typical Application Circuit VOUT R3 VIN OUT IN VVCC C1 EN C3 C2 FB PG VCC R1 AP7173 R2 SS GND CSS Figure 1. Typical Application Circuit (Adjustable Output) AP7173 Document number: DS31369 Rev. 9 - 2 1 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Typical Application Circuit (Continued) Table 1. Resistor Values for Programming the Output Voltage (Note 2) R1 (k) Short 0.619 1.13 1.37 1.87 2.49 4.12 3.57 3.57 3.57 R2 (k) Open 4.99 4.53 4.42 4.99 4.99 4.75 2.87 1.69 1.15 VOUT (V) 0.8 0.9 1 1.05 1.1 1.2 1.5 1.8 2.5 3.3 Note: 2 VOUT = 0.8 x (1 + R1 / R2) Table 2. Capacitor Values for Programming the Soft-Start Time (Note 3) CSS Open 270pF 560pF 2.7nF 5.6nF 0.01F Note: SOFT-START TIME 0.1ms 0.5ms 1ms 5ms 10ms 18ms -7 3. tSS(s) = 0.8 x CSS(F) / (4.4 x 10 ) Figure 2. Turn-On Response AP7173 Document number: DS31369 Rev. 9 - 2 2 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Pin Descriptions Pin Name IN SO-8EP PIN # DFN3030-10 1 1, 2 PG 2 3 VCC 3 4 EN 4 5 GND 5 6 SS 6 7 FB 7 8 OUT 8 9, 10 Thermal Pad -- -- Description Power Input pin. Power-Good pin, open-drain output. When the VOUT is below the PG threshold the PG pin is driven low; when the VOUT exceeds the threshold, the PG pin goes into a high-impedance state. To use the PG pin, use a 10k to 1M pull-up resistor to pull it up to a supply of up to 5.5V, which can be higher than the input voltage. Bias Input pin, provides input voltage for internal control circuitry. This voltage should be higher than the VIN. Enable pin. This pin should be driven either high or low and must not be floating. Driving this pin high enables the regulator, while pulling it low puts the regulator into shutdown mode. Ground. Soft-Start pin. Connect a capacitor between this pin and the ground to set the soft-start ramp time of the output voltage. If no capacitor is connected, the soft-start time is typically 100S. Feedback pin. Connect this pin to an external voltage divider to set the output voltage. Regulated Output pin. Solder this pad to large ground plane for increased thermal performance. Functional Block Diagram IN EN OUT Gate Driver Current Limit and Thermal Shutdown VCC SS + 0.8V PG FB + 0.72V GND AP7173 Document number: DS31369 Rev. 9 - 2 3 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Absolute Maximum Ratings (Note 4) Symbol Parameter Ratings Unit ESD HBM Human Body Model ESD Protection 4000 V ESD MM Machine Model ESD Protection 350 V VIN, VVCC Input Voltage Range -0.3 to +6 V VEN Enable Voltage Range -0.3 to +6 V VPG Power-Good Voltage Range -0.3 to +6 V VSS Soft-Start Voltage Range -0.3 to +6 V VFB Feedback Voltage Range -0.3 to +6 V -0.3 to VIN +0.3 V VOUT Output Voltage Range IOUT Maximum Output Current PD Continuous Total Power Dissipation (Note 5) TJ Junction Temperature Range -40 to +150 C TST Storage Junction Temperature Range -65 to +150 C Notes: Internally Limited DFN3030-10 3690 SO-8EP 5650 mW 4. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 5. Ratings apply to ambient temperature at 25C . The JEDEC High-K board design used to derive this data was a 2 inch x 2 inch multilayer board with 1-ounce internal power and ground planes and 2-ounce copper traces on the top and bottom of the board. Recommended Operating Conditions Symbol VIN VVCC IOUT TA Note: Parameter Input Voltage (Note 6) Bias Voltage Output Current Operating Ambient Temperature Min 1.0 2.7 0 -40 Max 5.5 5.5 1.5 85 Unit V V A C 6. At VIN =1V, the maximum load currents may be lower than 1.5A. AP7173 Document number: DS31369 Rev. 9 - 2 4 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Electrical Characteristics At VEN = 1.1V, VIN = VOUT + 0.5V, CVCC = 0.1uF, CIN = COUT = 10uF, IOUT = 50mA, VVCC = 5.0V, and TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C. Symbol Parameter Test Conditions Min Typ. Max Unit VIN Input Voltage Range VOUT + VDO 5.5 V Bias Pin Voltage Range VVCC 2.7 5.5 V (Note 7) Internal Reference VREF TA = +25 C 0.792 0.8 0.808 V (Adj.) 0.8 3.3 V Output Voltage Range VIN= 5V, IOUT= 1.5A 2.97VVVCC5.5V, VOUT -2 0.5 2 % Accuracy (Note 8) 50mAIOUT1.5A VOUT /VIN / 0.03 %/V Line Regulation VOUT (NOM) + 0.5VIN, 5.5V VOUT VOUT /VOUT 0.09 %/A Load Regulation 50mAIOUT1.5A /IOUT 165 270 mV IOUT = 1.5A,VVCC-VOUT(NOM)3.25V Dropout Voltage VDO (Note 9) IOUT= 1.5A, VIN = VVCC 1.5 1.7 V ICL Current Limit VOUT = 80% x VOUT (NOM) 2 3 4 A ISHORT Short-Circuit Current VOUT < 0.2V 0.6 1 A IVCC Bias Pin Current 1 2 mA Shutdown Supply ISHDN 1 50 A VEN0.4V Current (IGND) IFB Feedback Pin Current -1 0.1 1 A 1KHz, IOUT= 1A, 60 Power-Supply Rejection VIN= 1.8V, VOUT= 1.5V dB (VIN to VOUT) 300KHz, IOUT =1A, 30 VIN= 1.8V, VOUT =1.5V PSRR 1KHz, IOUT = 1A, 50 Power-SupplyRejection VIN= 1.8V, VOUT =1.5V dB (VVCC to VOUT) 300KHz, IOUT = 1A, 30 VIN= 1.8V, VOUT =1.5V TST Startup Time RLOAD for IOUT = 1.0A, CSS = open 100 S Soft-Start Charging ISS VSS= 0.4V 440 nA Current VEN, HI Enable Input High Level 1.1 5.5 V VEN, LO Enable Input Low Level 0 0.4 V VEN, HYS Enable Pin Hysteresis 50 mV IEN Enable Pin Current VEN= 5V 0.1 1 A VPG, TH PG Trip Threshold VOUT decreasing 85 90 94 %VOUT VPG, HYS PG Trip Hysteresis 3 %VOUT VPG, LO PG Output Low Voltage IPG= 1mA (sinking), VOUT<VPG, TH 0.3 V IPG, LKG PG Leakage Current VPG= 5.25V, VOUT>VPG, TH 0.1 1 A Shutdown, temperature increasing +150 Thermal Shutdown TSD C Temperature Reset, temperature decreasing +130 DFN3030-10 (Note 10) 35 Thermal Resistance o JA C/W Junction-to-Ambient SO-8EP (Note 11) 23 DFN3030-10 (Note 10) 4.9 Thermal Resistance o JC C/W Junction-to-Case SO-8EP (Note 11) 1.8 Notes: 7. VVCC should be higher or equal to VIN in this chip. 8. Tested at 0.8V; resistor tolerance is not taken into account. 9. Dropout is defined as the voltage from VIN to VOUT when VOUT is 3% below nominal. 10. Test condition for DFN3030-10: Device mounted on FR-4 substrate (2s2p), 2"*2" PCB, with 2oz copper trace thickness and large pad pattern. 11. Test condition for SOP-8L-EP: Device mounted on FR-4 substrate (2s2p), 2"*2" PCB, with 2oz copper trace thickness and large pad pattern. AP7173 Document number: DS31369 Rev. 9 - 2 5 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Typical Characteristics At TA = +25, VIN = VOUT(TYP) + 0.3V, VVCC = 5V, IOUT = 50mA, VEN = VIN, CIN = 1F, CVCC = 4.7F, and COUT = 10F, unless otherwise noted. 0.5 0.20 0.4 0.15 0.3 o o 25 C 0.05 0.00 -0.05 o o 25 C 0.2 125 C Vout(V) change in Vout(%) 0.10 125 C 0.1 0.0 -0.1 o -40 C -0.2 o -40 C -0.10 -0.3 -0.15 -0.20 0.0 -0.4 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 -0.5 0.5 5.0 1.0 1.5 Vin-Vout(V) 2.0 2.5 3.0 3.5 4.0 Vvcc-Vout(V) Figure. 3 VIN Line Regulation Figure. 4 VVCC Line Regulation 1.0 o 25 C 0.8 0.6 o Change Vout(%) 125 C 0.4 0.2 0.0 -0.2 -0.4 o -0.6 -40 C -0.8 -1.0 50 200 350 500 650 800 950 1100 1250 1400 1500 Iout(mA) Figure. 5 Load Regulation Figure .6 Load Regulation 240 300 220 280 260 180 VDropout(Vin-Vout)(mV) VDropout(Vin-Vout)(V) 200 o 25 C 160 140 o 125 C 120 100 80 60 220 200 o 25 C 180 160 o -40 C 140 120 100 Iout=1.5A 80 60 o 40 o 125 C 240 -40 C 40 20 20 0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 0 1.0 Iout(mA) Document number: DS31369 Rev. 9 - 2 2.0 2.5 3.0 3.5 4.0 4.5 Vvcc-Vout(V) Figure. 8 VIN Dropout Voltage vs. (VVCC-VOUT) and Temperature (TA) Figure. 7 VIN Dropout Voltage vs. IOUT and Temperature (TA) AP7173 1.5 6 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Typical Characteristics (Continued) At TA = +25C, VIN = VOUT(TYP) + 0.3V, VVCC = 5V, IOUT = 50mA, VEN = VIN, CIN = 1F, CVCC = 4.7F, and COUT = 10F, unless otherwise noted. 2000 200 1800 Iout=0.5A 160 VDropout(Vvcc-Vout)(mV) VDropout(Vin-Vout)(mV) 180 140 120 o 25 C o 125 C 100 80 60 1600 o 125 C 1400 o -40 C 1200 o 25 C 1000 40 800 20 o -40 C 0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 600 0.00 4.5 0.25 0.50 Vvcc-Vout 90 1.25 1.50 90 80 Power Supply Rejection Ratio(dB) Power Supply Rejection Ratio(dB) 1.00 Figure. 10 VVCC Dropout Voltage vs. IOUT and Temperature (TA) Figure. 9 VIN Dropout Voltage vs. (VVCC-VOUT) and Temperature (TA) Io=0.1A 70 60 Io=1.5A 50 40 Vin=1.8V Vout=1.2V Vvcc=5V Css=1nF 30 20 80 70 Io=0.1A 60 50 40 Vin=1.8V Vout=1.2V Vvcc=5V Css=1nF 30 20 Io=1.5A 10 10 0 10 100 1000 10000 100000 0 10 500000 100 1000 VoL Low-Level PG Voltage(V) Vout=1.2V Iout=1.5A Css=1nF 1KHz 60 10KHz 50 100KHz 40 30 500KHz 20 10 0 0.00 1000000 1E7 0.8 90 70 100000 Figure. 12 VVCC PSRR vs. Frequency Figure. 11 VIN PSRR vs. Frequency 80 10000 Frequency(Hz) Frequency(Hz) Power Supply Rejection Ratio(dB) 0.75 Iout(A) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 Vin-Vout(V) Document number: DS31369 Rev. 9 - 2 0 2 4 6 8 10 12 PG Current(mA) Figure. 13 VIN PSRR vs. (VIN-VOUT) AP7173 0.0 Figure. 14 Low-Level PG Voltage vs Current 7 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Typical Characteristics (Continued) At TA = +25C, VIN = VOUT(TYP) + 0.3V, VVCC = 5V, IOUT = 50mA, VEN = VIN, CIN = 1F, CVCC = 4.7F, and COUT = 10F, unless otherwise noted. Figure. 15 VIN Line Transient Figure. 16 VVCC Line Transient Figure. 17 Output Load Transient Figure. 18 Turn-On Response 2.0 2.0 1.8 1.8 1.6 1.6 o o 125 C 1.4 1.2 1.2 1.0 0.8 125 C 25 C 1.0 0.8 0.6 0.6 o -40 C o -40 C 0.4 0.4 0.2 0.0 0.0 o o 1.4 Ivcc(mA) Ivcc(mA) 25 C 0.2 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0.0 2.0 Iout(A) Document number: DS31369 Rev. 9 - 2 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6 Vvcc(V) Figure. 19 VCC Pin Current vs. IOUT and Temperature AP7173 2.4 Figure. 20 VCC Pin Current vs. VVCC and Temperature 8 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Typical Characteristics (Continued) At TA = +25C, VIN = VOUT(TYP) + 0.3V, VVCC = 5V, IOUT = 50mA, VEN = VIN, CIN = 1F, CVCC = 4.7F, and COUT = 10F, unless otherwise noted. p g 1.25 1.50 Vout=1.2V 1.15 Quiescent Current(mA) Quiescent Current(IGND) (mA) 1.20 1.10 Vin=2.5V 1.05 1.00 0.95 0.90 Vin=1.8V 0.85 Io=0A 1.25 Io=1.5A 1.00 0.75 Vin=1.8V Vout=1.2V Io=0.5A 0.80 0.75 0.00 0.25 0.50 0.75 1.00 1.25 0.50 2.50 1.50 2.75 3.00 Iout(A) 3.25 3.50 Vvcc(V) Figure. 21 Quiescent Current vs. IOUT Figure 22. Quiescent Current vs. VVCC 3.0 1.50 2.9 2.8 Current limit(A) Quiescent Current(mA) Vvcc=5V 1.25 1.00 Vvcc=3.3V Vin=1.8V Vout=1.2V 2.7 2.6 o 25 C o -40 C 2.5 2.4 2.3 o 125 C 0.75 2.2 2.1 0.50 -50 -25 0 25 50 75 100 125 2.0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Vvcc-Vout(V) o Temperature( C) Figure. 23 Quiescent Current vs. Temperature Figure. 24 Current Limit vs. (VVCC-VOUT) 500 475 450 Iss(nA) 425 400 375 350 325 300 -50 -25 0 25 50 75 100 125 o Temperature( C) Figure. 25 Soft-Start Charging Current (ISS) vs. Temperature AP7173 Document number: DS31369 Rev. 9 - 2 9 of 15 www.diodes.com Figure. 26 Power-Up/Power-Down April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Application Notes BIAS VOLTAGE VVCC The AP7173 is a low VIN, low dropout regulator that uses an NMOS pass FET. The VCC pin must be connected to a DC bias supply VVCC for the internal control circuitry and the gate drive of the pass FET to function properly and to obtain low dropout. The VVCC needs to be equal to or higher than the VIN and in the range of 2.7V-5.5V. Figure 27 illustrates the typical application circuit for the AP7173. Using high quality, low ESR capacitors and placing them close to the OUT and GND pins can improve perfomance. DROPOUT VOLTAGE The very low dropout makes the AP7173 well suited for high-current, low VIN/low VOUT applications. To achieve the specified low-dropout performance for such applications, the VCC pin should be connected to a separate supply of at least 3.25V higher than VOUT. Figure 28 shows an application circuit where VVCC is 5V and VOUT is 1.2V. Figure 27. Typical Application Circuit for AP7173 ADJUSTABLE OUTPUT VOLTAGE With an external voltage divider, the AP7173 can provide output voltage from 0.8V to 3.3V. R1 and R2 can be calculated for any output voltage using the following equation, where VREF=0.8 is the AP7173's internal reference voltage. Refer to Table 1 for resistor combinations for commonly used output voltages. For maximum voltage accuracy, R2 should be 5k. VOUT = VREF x (1 + R1/R2) INPUT VIN AND BIAS VVCC CAPACITORS It is important to keep the IN and VCC pins clear of large ripples, glitches and other noises by connecting capacitors to the IN and VCC pins. The required capacitance on these pins is strongly dependent on source and wiring impedance of the supplies. To provide good decoupling for the input power supply VIN, it is recommended that a ceramic capacitor with capacitance of at least 1F is connected between the IN and GND pins at a location as close to them as possible. High quality, low ESR capacitors should be used for better performance. It is critical to provide good decoupling to the VCC pin for the AP7173's internal control circuitry to function properly. The minimum recommended capacitance for the VVCC is 1F when the VVCC and VIN are separate supplies. If the VIN and VVCC are connected to the same supply, the recommended minimum capacitance for VVCC is 4.7F. Again good quality, low ESR capacitors should be used for optimum performance. OUTPUT CAPACITOR The output capacitor affects the stability and transient response of the LDO. The AP7173 is designed to be stable for all types of output capacitors 2.2F, single or multiple in parallel. AP7173 Document number: DS31369 Rev. 9 - 2 Figure. 28 Typical Application Circuit for AP7173 Using Separate VCC and IN Rails For applications where low dropout is not required or a separate VVCC supply is not available, the IN and VCC pins can be tied together. In this situation, a voltage difference of at least 1.7V between the VVCC and VOUT has to be maintained for the VVCC to provide enough gate drive to the pass FET. Therefore, the VOUT needs to be 1.7V or more below VIN, as shown in Figure 29. Figure. 29 Typical Application Circuit for AP7173 Without an Auxiliary VCC Rail PROGRAMMABLE SOFT-START The AP7173 features a voltage-controlled soft-start that is programmable with an external capacitor (CSS). The AP7173 achieves a monotonic soft-start by tracking the voltage ramp of the external soft-start capacitor until the ramp voltage reaches the internal reference voltage. 10 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Application Notes (Continued) PROGRAMMABLE SOFT-START (cont.) The relationship between the soft-start time and the softstart charging current (ISS), soft-start capacitance (CSS), and the internal reference voltage (VREF) is tSS = (VREF x CSS) / ISS Refer to Table 2 for suggested soft-start capacitor values ENABLE/SHUTDOWN The EN pin can be used with standard digital signals or relatively slow-ramping analog signals. Pulling the VEN below 0.4V turns the regulator off, while driving the VEN above 1.1V turns the regulator on. Figure 30 shows an example where an RC circuit is used to delay start the AP7173. If not used, the EN pin can be connected to the VCC or IN pin when the VIN is greater than 1.1V, as long as good decoupling measures are taken for the EN pin. over-current protection circuitry to protect the device against overload conditions. It limits the device current to a typical value of 3A and reduces the VOUT when the load tries to pull more current. For more effective protection against short-circuit failure, the AP7173 also includes a short-circuit foldback mechanism that lowers the current limit to a typical value of 1.0A when the VFB drops to below 0.2V. THERMAL PROTECTION Thermal shutdown limits the AP7173 junction temperature and protects the device from damage as a result of overheating. Thermal protection turns off the VOUT when the AP7173's junction temperature rises to approximately +150C, allowing it to cool down. When the junction temperature drops to approximately +130C, the output is re-enabled. Therefore, the thermal protection circuit may cycle on and off at a rate dependent on the power dissipation, thermal resistance, and ambient temperature. POWER DISSIPATION Figure 30. Delayed Start Using an RC Circuit to Enable AP7173 POWER-GOOD The power-good (PG) pin is an open-drain output and can be pulled up through a resistor of 10k to1M to VIN, VOUT or any other rail that is 5.5V or lower. When the VOUT VPG,TH+VPG,HYS, the PG output is high-impedance; if the VOUT drops to below VPG,TH, VVCC 1.9V or the device is disabled, the PG pin is pulled to low by an internal MOSFET. OVER-CURRENT AND SHORT-CIRCUIT PROTECTION The AP7173 features a factory-trimmed, temperature and supply voltage compensated internal current limit and an AP7173 Document number: DS31369 Rev. 9 - 2 Thermal shutdown is intented to protect the AP7173 against abnormal overheating. For normal operation, excessive power dissipation should be avoided and good heatsinking should be provided. Power dissipation in the device is the product of the device dropout voltage and the load current, PD = (VIN - VOUT) x IOUT As can be seen, power dissipation can be minimized by using the lowest input voltage necessary to achieve the required output voltage regulation. To ensure that the device junction temperature does not exceed the specified limit of 125C, an application should provide heat conduction paths that have junction-toambient thermal resistance lower than the calculated value here: RJA = (125C -TA ) / PD For the DFN package with exposed pad, the primary conduction path for heat is through the exposed pad to the printed circuit board (PCB). The pad should be attached to an appropriate amount of copper PCB area to ensure that the device does not overheat. 1 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Ordering Information AP 7173 - XX G - X Device AP7173-FNG-7 AP7173-SPG-13 Note: Package Green FN : DFN3030-10 SP : SO-8EP G : Green Package Code FN SP Packing 7/13 : Tape & Reel 7"/13" Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 2500/Tape & Reel -13 Packaging (Note 12) DFN3030-10 SO-8EP 12. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. Marking Information (1) DFN3030-10 ( Top View ) XX : Identification Code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green XX YWX Part Number AP7173 Package DFN3030-10 Identification Code BA (2) SO-8EP ( Top View ) 8 5 Logo Part No . AP7173 YY WW X X E 1 AP7173 Document number: DS31369 Rev. 8 - 2 G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code SO-8EP 4 12 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Package Outline Dimensions (All Dimensions in mm) (1) Package Type: DFN3030-10 (2) Package Type: SO-8EP Detail "A" Exposed pad 2.4Ref. 3.70/4.10 45 0.35max. 3.85/3.95 5.90/6.10 7~9 7~9 1 1 0.15/0.25 Bottom View 1.75max. 1.30/1.50 3.3Ref. 0/0.13 0.254 0.3/0.5 1.27typ 4.85/4.95 1 Gauge Plane Seating Plane 0.62/0.82 Detail "A" 8x-0.60 5.4 Exposed pad 8x-1.55 6x-1.27 Land Pattem Recommendation (Unit:mm) AP7173 Document number: DS31369 Rev. 8 - 2 13 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Tape Orientation For DFN3030-10 Notes: 13. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf AP7173 Document number: DS31369 Rev. 8 - 2 14 of 15 www.diodes.com April 2011 (c) Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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