AP7173_09

AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Features • • • • • • • • • • • 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 ≥ 2.2µF DFN3030-10 and SOP-8L-EP: available in “Green” molding compound (No Br, Sb) Lead-free finish/ RoHS Compliant (Note 1) General Description 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. The soft-start reduces inrush current of the load capacitors and minimizes stress on the input power source during start-up. 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. The AP7173 is stable with any type of output capacitor of 2.2µF 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 SOP-8L-EP packages. Applications • • • • • PCs, Servers, Modems, and Set-Top-Boxes FPGA Applications DSP Core and I/O Voltages Post-Regulation Applications Applications With Sequencing Requirements Typical Application Circuit R3 VOUT VIN IN OUT FB R1 C2 C1 PG VCC EN C3 VVCC AP7173 SS GND CSS R2 Figure 1. Typical Application Circuit (Adjustable Output) AP7173 Rev. 7 DS31369 1 of 16 www.diodes.com OCTOBER 2009 © 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 3) R1 (kΩ) Short 0.619 1.13 1.37 1.87 2.49 4.12 3.57 3.57 3.57 R2 (kΩ) 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: 3) VOUT = 0.8 x (1 + R1 / R2) Table 2. Capacitor Values for Programming the Soft-Start Time (Note 4) CSS Open 270pF 560pF 2.7nF 5.6nF 0.01µF Notes: SOFT-START TIME 0.1ms 0.5ms 1ms 5ms 10ms 18ms –7 4. tSS(s) = 0.8 x CSS(F) / (4.4 x 10 ) Figure 2. Turn-On Response AP7173 Rev. 7 DS31369 2 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Ordering Information AP 7173 - XX G - X Package FN : DFN3030-10 SP : SOP-8L-EP Green G : Green Packing 7/13 : Tape & Reel Device AP7173-FNG-7 AP7173-SPG-13 Notes: Package Code FN SP Packaging (Note 2) DFN3030-10 SOP-8L-EP 7”/13” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 2500/Tape & Reel -13 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. 2. 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. Pin Assignments ( Top View ) 1 2 3 4 5 ( Top View ) IN IN PG VCC EN 10 9 8 7 6 OUT OUT FB SS GND IN PG VCC EN 1 2 3 4 8 7 6 5 OUT FB SS GND DFN3030-10 SOP-8L-EP AP7173 Rev. 7 DS31369 3 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Pin Descriptions Pin Name IN PIN # SOP-8L-EP 1 DFN3030-10 1, 2 Power Input pin. Description PG 2 3 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 10kΩ to 1MΩ 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 100µS. 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. VCC 3 4 EN GND SS 4 5 6 5 6 7 FB OUT Thermal Pad 7 8 — 8 9, 10 — Block Diagram IN OUT Gate Driver Current Limit and Thermal Shutdown EN VCC + PG + 0.72V 0.8V SS FB GND AP7173 Rev. 7 DS31369 4 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Absolute Maximum Ratings Symbol ESD HBM ESD MM VIN, VVCC VEN VPG VSS VFB VOUT IOUT TJ TST Notes: (Note 5) Parameter Human Body Model ESD Protection Machine Model ESD Protection Input Voltage Range Enable Voltage Range Power-Good Voltage Range Soft-Start Voltage Range Feedback Voltage Range Output Voltage Range Maximum Output Current Junction Temperature Range Storage Junction Temperature Range Ratings 4000 350 -0.3 to +6 -0.3 to +6 -0.3 to +6 -0.3 to +6 -0.3 to +6 -0.3 to VIN +0.3 Internally Limited -40 to +150 -65 to +150 Unit V V V V V V V V ºC ºC 5. 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. Recommended Operating Conditions Symbol VIN VVCC IOUT TA Notes: 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 ºC 6. At VIN =1V, the maximum load currents may be lower than 1.5A. AP7173 Rev. 7 DS31369 5 of 16 www.diodes.com OCTOBER 2009 © 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 = –40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. Symbol VIN VVCC VREF VOUT ∆VOUT /∆VIN / VOUT ∆VOUT /VOUT /∆IOUT VDO ICL ISHORT IVCC ISHDN IFB PSRR TST ISS VEN, HI VEN, LO VEN, HYS IEN VPG, TH VPG, HYS VPG, LO IPG, LKG TSD θJA Notes: Parameter Test Conditions Input Voltage Range Bias Pin Voltage Range (Note 7) Internal Reference TA = +25 ºC (Adj.) Output Voltage Range VIN= 5V, IOUT= 1.5A 2.97V≤VVCC≤5.5V, Accuracy (Note 8) 50mA≤IOUT≤1.5A Line Regulation VOUT (NOM) + 0.5≤VIN, 5.5V Load Regulation 50mA≤IOUT≤1.5A IOUT = 1.5A,VVCC–VOUT(NOM)≥3.25V Dropout Voltage (Note 9) IOUT= 1.5A, VIN = VVCC Current Limit VOUT = 80% x VOUT (NOM) Short-Circuit Current VOUT < 0.2V Bias Pin Current Shutdown Supply VEN≤0.4V Current (IGND) Feedback Pin Current 1KHz, IOUT= 1A, Power-Supply Rejection VIN= 1.8V, VOUT= 1.5V (VIN to VOUT) 300KHz, IOUT =1A, VIN= 1.8V, VOUT =1.5V 1KHz, IOUT = 1A, Power-SupplyRejection VIN= 1.8V, VOUT =1.5V (VVCC to VOUT) 300KHz, IOUT = 1A, VIN= 1.8V, VOUT =1.5V Startup Time RLOAD for IOUT = 1.0A, CSS = open Soft-Start Charging VSS= 0.4V Current Enable Input High Level Enable Input Low Level Enable Pin Hysteresis Enable Pin Current VEN= 5V PG Trip Threshold VOUT decreasing PG Trip Hysteresis PG Output Low Voltage IPG= 1mA (sinking), VOUTVPG, TH Shutdown, temperature increasing Thermal Shutdown Temperature Reset, temperature decreasing DFN3030-10 (Note 10) Thermal Resistance Junction-to-Ambient SOP-8L-EP (Note 11) Min VOUT + VDO 2.7 0.792 0.8 –2 Typ. Max 5.5 5.5 Unit V V V V % %/V %/A mV V A A mA µA µA dB 0.8 0.808 3.3 ±0.5 0.03 0.09 165 1.5 3 1 1 1 2 2 0.6 270 1.7 4 2 50 1 –1 0.1 60 30 50 dB 30 100 440 1.1 0 50 0.1 90 3 0.1 +150 +130 38 30 5.5 0.4 1 94 0.3 1 µS nA V V mV µA %VOUT %VOUT V µA ºC o 85 C/W 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 Rev. 7 DS31369 6 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Typical Performance Characteristics At TA = +25℃, VIN = VOUT(TYP) + 0.3V, VVCC = 5V, IOUT = 50mA, VEN = VIN, CIN = 1µF, CVCC = 4.7µF, and COUT = 10µF, unless otherwise noted. VIN LINE REGULATION 0.20 0.15 0.10 VVCC LINE REGULATION 0.5 0.4 0.3 change in Vout(%) 25 C 0.05 0.00 -0.05 -0.10 o o 125 C o 0.2 25 C o 125 C o Vout(V) -40 C 0.1 0.0 -0.1 -0.2 -0.3 -40 C o -0.15 -0.20 0.0 -0.4 -0.5 0.5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Vin-Vout(V) Vvcc-Vout(V) Figure 3 LOAD REGULATION 1.0 0.8 0.6 o Figure 4 LOAD REGULATION 25 C 125 C Change Vout(%) 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 50 o -40 C o 200 350 500 650 800 950 1100 1250 1400 1500 Iout(mA) Figure 5 VIN DROPOUT VOLTAGE vs. IOUT AND TEMPERATURE(TA) 240 220 200 Figure 6 VIN DROPOUT VOLTAGE vs. (VVCC-VOUT) AND TEMPERATURE(TA) 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 VDropout(Vin-Vout)(V) 180 160 140 120 100 80 60 40 20 25 C 125 C o o VDropout(Vin-Vout)(mV) 125 C o 25 C -40 C o o Iout=1.5A -40 C o 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 Iout(mA) Vvcc-Vout(V) Figure 7 Figure 8 AP7173 Rev. 7 DS31369 7 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Typical Performance Characteristics VIN DROPOUT VOLTAGE vs. (VVCC-VOUT) AND TEMPERATURE(TA) 200 180 (Continued) VVCC DROPOUT VOLTAGE vs. IOUT AND TEMPERATURE(TA) 2000 1800 At TA = +25℃, VIN = VOUT(TYP) + 0.3V, VVCC = 5V, IOUT = 50mA, VEN = VIN, CIN = 1µF, CVCC = 4.7µF, and COUT = 10µF, unless otherwise noted. VDropout(Vvcc-Vout)(mV) VDropout(Vin-Vout)(mV) 160 140 120 100 80 60 40 o Iout=0.5A 1600 125 C 1400 o o 25 C 125 C o -40 C 1200 1000 25 C o 800 20 0 1.0 -40 C 1.5 2.0 2.5 3.0 3.5 4.0 4.5 600 0.00 0.25 0.50 0.75 1.00 1.25 1.50 o Vvcc-Vout Iout(A) Figure 9 VIN PSRR vs. FREQUENCY 90 80 70 60 50 40 30 20 10 0 10 90 Figure 10 VVCC PSRR vs. FREQUENCY Power Supply Rejection Ratio(dB) 80 70 60 50 40 30 20 10 0 10 Power Supply Rejection Ratio(dB) Io=0.1A Io=0.1A Io=1.5A Vin=1.8V Vout=1.2V Vvcc=5V Css=1nF Vin=1.8V Vout=1.2V Vvcc=5V Css=1nF Io=1.5A 100 1000 10000 100000 500000 100 1000 10000 100000 1000000 1E7 Frequency(Hz) Frequency(Hz) Figure 11 VIN PSRR vs. (VIN-VOUT) Power Supply Rejection Ratio(dB) 90 80 70 60 50 Figure 12 LOW-LEVEL PG VOLTAGE vs. CURRENT 0.8 Vout=1.2V Iout=1.5A Css=1nF VoL Low-Level PG Voltage(V) 2.50 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 2 4 6 8 10 12 1KHz 10KHz 100KHz 40 30 20 10 0 0.00 500KHz 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 Vin-Vout(V) PG Current(mA) Figure 13 Figure 14 AP7173 Rev. 7 DS31369 8 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Typical Performance Characteristics VIN LINE TRANSIENT (Continued) VVCC LINE TRANSIENT At TA = +25℃, VIN = VOUT(TYP) + 0.3V, VVCC = 5V, IOUT = 50mA, VEN = VIN, CIN = 1µF, CVCC = 4.7µF, and COUT = 10µF, unless otherwise noted. Figure 15 OUTPUT LOAD TRANSIENT Figure 16 TURN-ON RESPONSE Figure 17 VCC PIN CURRENT vs. IOUT AND TEMPERATURE (TA) 2.0 1.8 1.6 1.4 o Figure 18 VCC PIN CURRENT vs. VVCC AND TEMPERATURE (TA) 2.0 1.8 25 C Ivcc(mA) 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.0 125 C 1.4 o 1.6 25 C o 125 C o Ivcc(mA) 1.2 1.0 0.8 0.6 -40 C 0.4 0.2 o -40 C o 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0.0 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6 Iout(A) Vvcc(V) Figure 19 Figure 20 AP7173 Rev. 7 DS31369 9 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Typical Performance Characteristics QUIESCENT CURRENT vs. IOUT p g 1.25 1.20 (Continued) QUIESCENT CURRENT vs. VVCC 1.50 At TA = +25℃, VIN = VOUT(TYP) + 0.3V, VVCC = 5V, IOUT = 50mA, VEN = VIN, CIN = 1µF, CVCC = 4.7µF, and COUT = 10µF, unless otherwise noted. Quiescent Current(IGND) (mA) 1.15 1.10 Vout=1.2V Quiescent Current(mA) 1.25 Io=0A Io=1.5A Vin=2.5V 1.05 1.00 0.95 0.90 1.00 Vin=1.8V 0.85 0.80 0.75 0.00 0.75 Vin=1.8V Vout=1.2V Io=0.5A 0.25 0.50 0.75 1.00 1.25 1.50 0.50 2.50 2.75 3.00 3.25 3.50 Iout(A) Vvcc(V) Figure 21 QUIESCENT CURRENT vs. TEMPERATURE 1.50 3.0 2.9 Figure 22 CURRENT LIMIT vs. (VVCC – VOUT) Vvcc=5V Quiescent Current(mA) 1.25 2.8 Current limit(A) 2.7 2.6 2.5 2.4 2.3 o o o 25 C -40 C 1.00 Vvcc=3.3V 0.75 Vin=1.8V Vout=1.2V 125 C 2.2 2.1 0.50 -50 -25 0 25 50 o 75 100 125 2.0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Temperature( C) Vvcc-Vout(V) Figure 23 SOFT-START CHARGING CURRENT (I SS) vs. TEMPERATURE 500 475 450 425 Figure 24 POWER-UP/POWER-DOWN Iss(nA) 400 375 350 325 300 -50 -25 0 25 50 o 75 100 125 Temperature( C) Figure 25 Figure 26 AP7173 Rev. 7 DS31369 10 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Application Note 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. R3 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. VOUT VIN IN C1 PG VCC EN C3 OUT FB R1 C2 +5V AP7173 SS GND CSS R2 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 ≤ 5kΩ. 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. 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 1µF 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 1µF 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 4.7µF. 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 ≥ 2.2µF, single or multiple in parallel. Using high-quality, low ESR capacitors and placing them close to the OUT and GND pins can improve perfomance. 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. The relationship between the soft-start time and the soft-start 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. AP7173 Rev. 7 DS31369 11 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Application Note ENABLE/SHUTDOWN (Continued) 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. 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 +150°C, allowing it to cool down. When the junction temperature drops to approximately +130°C, 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 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, 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 10kΩ to1MΩ 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 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. 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 125°C, an application should provide heat conduction paths that have junction-to-ambient thermal resistance lower than the calculated value here: RθJA = (125°C –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. AP7173 Rev. 7 DS31369 12 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Marking Information (1) DFN3030-10 ( Top View ) XX YWX 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 Identification Code BA Part Number AP7173 Package DFN3030-10 (2) SOP-8L-EP ( Top View ) 8 5 Logo Part No. AP7173 YY WW X X E 1 4 G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code SOP-8L-EP AP7173 Rev. 7 DS31369 13 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Package Information (1) Package Type: DFN3030-10 0.57/0.60 0/0.05 0.10 C (All Dimensions in mm) 0.08 C 0.15Typ. Seating Plane C A 0.10 CAB TOP MARK 2X- 0.25 A Side View B 2.9/3.1 2.3/2.5 R0 . 30 0 (Pin #1 ID) 2.9/3.1 1.5/1.7 2X- 0.25 B 0.375Typ. 0.50Typ. 0.2/0.3 Bottom View (2) Package Type: SOP-8L-EP Detail "A" Exposed pad 7°~9° 3.85/3.95 5.90/6.10 3.70/4.10 0.25/0.55 45° 0.35max. 7°~9° 1 1.30/1.50 1.75max. 0.15/0.25 3.3Ref. 1 Bottom View 0/0.13 0.254 1.27typ 4.85/4.95 1 0.3/0.5 Gauge Plane Seating Plane 0.62/0.82 Detail "A" 8x-0.60 Exposed pad 6x-1.27 8x-1.55 Land Pattem Recommendation (Unit:mm) 5.4 AP7173 Rev. 7 DS31369 14 of 16 www.diodes.com 2.4Ref. OCTOBER 2009 © Diodes Incorporated AP7173 1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START Taping Orientation For DFN3030-10 Notes: 12. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf AP7173 Rev. 7 DS31369 15 of 16 www.diodes.com OCTOBER 2009 © 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 REGARDING 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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Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2009, Diodes Incorporated www.diodes.com AP7173 Rev. 7 DS31369 16 of 16 www.diodes.com OCTOBER 2009 © Diodes Incorporated