AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Description Pin Assignments (Top View) NEW PRODUCT The AP7362 is a 1.5A adjustable output voltage linear regulator with ultra-low dropout. The device includes pass element, error amplifier, band-gap, current limit and thermal shutdown circuitry. The integrated Enable block allows the part to be turned on and off via a logic signal. A logic high level on EN turns the device on and a logic low turns the part off. ADJ/ NC OUT OUT OUT The low dropout voltage characteristics and fast transient response to step changes in load make it suitable for low voltage microprocessor applications. The typical quiescent current is approximately 0.5mA and changes little with load current. The built-in current-limit and thermal-shutdown functions prevent damage to the IC in fault conditions. • • • • • VADJ accuracy of ±3% over line, load and temperature Excellent Load/Line Transient Response Current limit and thermal shutdown protection Ambient temperature range: -40ºC to 85ºC U-DFN2030-8, SO-8EP: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) • 6 5 1 2 3 4 U-DFN2030-8 (Top View) GND 1 8 ADJ/NC EN 2 7 OUT IN 3 6 OUT IN 4 5 OUT Features 1.5A ultra-low dropout linear regulator with EN Ultra-low dropout: 220mV at 1.5A Stable with 10µF input/output capacitor, any type Wide input voltage range: 2.7V to 5.5V Adjustable output voltage: 0.6V to 5.0V Fixed output options: 1V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V Low ground pin current 25nA quiescent current in shutdown mode VADJ accuracy of ±1.5% @ 25°C 7 GND EN IN IN This device is available in U-DFN2030-8 and SO-8EP packages. • • • • • • • • • 8 SO-8EP Typical Application Circuit VIN VOUT IN OUT AP7362 10µF Enable 10µF EN GND Fixed Output VOUT VIN IN OUT AP7362 10µF Applications Enable 10µF ADJ EN GND • • • • ASIC power supplies in printers, graphics cards, DVD players, STBs, routers, etc FPGA and DSP core or I/O power supplies SMPS regulator Conversion from 3.3Vor 5V rail Notes: R1 R2 Adjustable Output ⎛ R ⎞ V OUT = VREF ⎜⎜ 1 + 1 ⎟⎟ where R 2 ≤ 10 k Ω R2 ⎠ ⎝ 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. AP7362 Document number: DS35058 Rev. 2 - 2 1 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR NEW PRODUCT Pin Descriptions Pin Name Pin Number GND EN IN OUT 1 2 3, 4 5, 6, 7 ADJ 8 NC 8 EP Description Ground. Enable input, active high. Voltage input pin. Voltage output pin. Output feedback pin for adjustable version only – a resistor divider from this pin to the OUT pin and ground sets the output voltage. No connection for fixed output version. The exposed pad (EP) is used to remove heat from the package and it is recommended that it is connected to a copper area. The die is electrically connected to the exposed pad. It is recommended to connect it externally to GND, but should not be the only ground connection. EP Functional Block Diagram IN EN OUT Gate Driver Current Limit and Thermal Shutdown EN R OUT IN Gate Driver Current Limit and Thermal Shutdown ADJ 0.605V 0.605V R GND Adjustable Version Fixed Version AP7362 Document number: DS35058 Rev. 2 - 2 GND 2 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Absolute Maximum Ratings (Note 2) Symbol Ratings Unit ESD HBM Human Body Model ESD Protection 2000 V ESD MM Machine Model ESD Protection 200 V -0.3 to 6.0 V -0.3V to VIN + 0.3 V VIN VOUT, VEN NEW PRODUCT Parameter OUT, EN Voltage IOUT Continuous Load Current TST Storage Temperature Range TJ Notes: Input Voltage Internal Limited Maximum Junction Temperature -65 to 150 °C 150 °C 2. 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 or any other conditions beyond those indicated is not implied. Exposure to absolute-maximum rated conditions for extended periods may affect device reliability. Recommended Operating Conditions Symbol Notes: Parameter VIN Input voltage IOUT Output Current Min Max Unit 2.7 5.5 V 0 1.5 A TA Operating Ambient Temperature -40 85 °C TJ Operating Junction Temperature (Note 3) -40 125 °C 3. Operating junction temperature must be evaluated and derated as needed, based on ambient temperature (TA), power dissipation (PD), maximum allowable operating junction temperature (TJ-MAX), and package thermal resistance (θJA). AP7362 Document number: DS35058 Rev. 2 - 2 3 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Electrical Characteristics o TA = 25 C, VIN = 3.3V, VOUT =1.8V, IOUT = 10mA, VEN = VIN, CIN = 10μF, COUT = 10μF, VEN = 2V, unless otherwise stated. Minimum and maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely o parametric norm at TA = 25 C, and are provided for reference purposes only. NEW PRODUCT Symbol Parameter Test Conditions Min TA = 25oC Over temp Typ. VADJ ADJ Pin Voltage VADJ ADJ Pin Voltage (A Grade) VIN = VIN-Min to VIN-Max, IOUT= 10mA to 1.5A TA = 25oC Over temp IADJ ADJ Pin Bias Current VIN = VIN-Min to VIN-Max TA = 25oC Over temp 50 Dropout Voltage (Note 4) IOUT = 1.5A, VOUT = 2.5V o TA = 25 C Over temp 190 ΔVOUT /ΔVIN Line Regulation (Note 5) VIN = VIN-Min to VIN-Max o TA = 25 C Over temp - ΔVOUT /ΔIOUT Load Regulation (Note 5) IOUT = 10mA to 1.5A o TA = 25 C Over temp - VDropout IGND Ground Pin Current in Normal Operation Mode IOUT = 10mA to 1.5A o TA = 25 C Over temp ISHDN Ground Pin Current VEN < VIL o TA = 25 C Over temp IOUT-PK Peak Output Current VOUT ≥ VOUT-NOM -5% 0.04 0.05 0.18 0.33 1 OUT grounded VIH Enable Logic High VIN = VIN-Min to VIN-Max TA = 25 C Over temp Over temp VIL Enable Logic Low VIN = VIN-Min to VIN-Max Over temp IIH Enable Pin High Current VEN = VIN 1 IIL Enable Pin Low Current VEN = 0V 0.1 td(on) Turn-on delay PSRR Ripple Rejection ρn(l/f) Output Noise Density en Output Noise Voltage IOUT = 1.5A From VEN > VIH to VOUT = ON, IOUT = 1.5A mA μA A A V nA 25 μs VIN = 3.0V, IOUT = 1.5A, f = 120Hz 65 VIN = 3.0V, IOUT = 1.5A, f = 1kHz 61 F = 120Hz, COUT = 10μF ceramic BW = 100Hz – 100kHz, COUT = 10μF ceramic 1.0 μV/√Hz 90 μV(rms) 170 Thermal shutdown hysteresis TJ falling from TSHDN U-DFN2030-8 (Note 6) SO-8EP (Note 6) U-DFN2030-8 (Note 6) 10 174.0 52.8 28.2 SO-8EP (Note 6) 10.0 Notes: %/A μs THYS Thermal Resistance Junction-toCase %/V 25 TJ rising θJC mV 0.65 Thermal shutdown threshold Thermal Resistance Junction-toAmbient - nA 2 1.4 TSHDN θJA 750 240 280 - V 3.7 Short Circuit Current From VEN < VIL to VOUT = OFF, V 1.2 1.3 0.025 0.125 15 3.6 ISC Turn-off delay Unit 0.575 0.635 0.596 0.605 0.614 0.587 0.623 o td(off) Max 0.584 0.605 0.626 VIN = VIN-Min to VIN-Max, IOUT= 10mA to 1.5A dB °C o C/W o C/W 4. Dropout voltage is the minimum voltage difference between the input and the output at which the output voltage drops 2% below its nominal value. For any output voltage less than 2.5V, the minimum VIN operating voltage is the limiting factor. 5. The line and load regulation specification contains only the typical number. However, the limits for line and load regulation are included in the adjust voltage tolerance specification. 6. Device mounted on 2” x 2” FR-4 substrate PCB, 2oz copper with minimum recommended pad layout. AP7362 Document number: DS35058 Rev. 2 - 2 4 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Typical Performance Characteristics Unless otherwise specified: TJ=25°C, VIN=2.7V, VEN=VIN, CIN=10μF, COUT=10μF, IOUT=10mA, VOUT=1.8V Noise Density Noise Density 10k COUT=10μF TANT NOISE(nV/ROOT-Hz) NOISE(nV/ROOT-Hz) COUT=10μF CER 1k 100 1k 100 10 10 100 1000 10k 100 100k 1000 10k 100k FREQUENCY(Hz) FREQUENCY(Hz) I GND vs Load Current I GND(OFF) vs Temperature 3 1k VEN = 0.65V 2.5 100 IGND(nA) 2 IGND (mA) NEW PRODUCT 10k 1.5 1 10 0.5 0 1 0 0.5 1 1.5 -50 ILOAD (A) AP7362 Document number: DS35058 Rev. 2 - 2 -25 0 25 50 75 100 125 TEMPERATURE(℃ ) 5 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Typical Performance Characteristics (cont.) Unless otherwise specified: TJ=25°C, VIN=2.7V, VEN=VIN, CIN=10μF, COUT=10μF, IOUT=10mA, VOUT=1.8V Dropout Voltage vs Load Current VADJ vs Temperature 0.615 0.3 DROPOUT VOLTAGE(V) VADJ (V) 0.605 0.600 0.595 0.590 125°C 25°C 0.2 -40°C 0.1 0 -50 -25 0 25 50 75 100 125 0 TEMPERATURE(℃ ) 0.5 1 LOAD CURRENT(A) 1.5 Turn-on Characeristics VEN vs Temperature 2 1.3 IL=0A 1.2 1.1 V OUT(V) VEN (V) NEW PRODUCT 0.610 1 1 125°C 25°C 0.9 0.8 -50 -40°C 0 -25 0 25 50 75 100 125 AP7362 Document number: DS35058 Rev. 2 - 2 0 1 2 3 VIN (V) TEMPERATURE(℃ ) 6 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Typical Performance Characteristics (cont.) Unless otherwise specified: TJ=25°C, VIN=2.7V, VEN=VIN, CIN=10μF, COUT=10μF, IOUT=10mA, VOUT=1.8V Turn-on Time Turn-on Time VOUT=1.2V (500mV/div) IL=1.5A, COUT=10μF CER NEW PRODUCT VOUT=1.2V (500mV/div) IL=0A, COUT=10μF CER VIN=3.0V (2V/div) VIN=3.0V (2V/div) Time (10μs/div) Time (10μs/div) Load Transient Response PSRR VIN=VEN=3.3V COUT=10μF CER 90 VOUT=1.8V (50mV/div) ILOAD=100mA to 1.5A (1A/div) REJECTION RATIO(dB) 80 70 60 50 40 VIN=3.3V 30 VOUT=1.8V =1A 20 IOUT CIN=1μF CER 10 COUT=1μF CER 0 0.1 Document number: DS35058 Rev. 2 - 2 10 100 1000 FREQUENCY(kHz) Time (40μs/div) AP7362 1 7 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Application Information A minimum 2.2μF ceramic capacitor is recommended between IN and GND pins to decouple input power supply glitch and noise. The amount of the capacitance may be increased without limit. Larger input capacitor like 10μF will provide better load transient response. This input capacitor must be located as close as possible to the device to assure input stability and reduce noise. For PCB layout, a wide copper trace is required for both IN and GND pins. A lower ESR capacitor type allows the use of less capacitance, while higher ESR type requires more capacitance. ⎛V ⎞ R1 = R 2 ⎜ OUT − 1⎟ ⎜V ⎟ ⎝ REF ⎠ To maintain the stability of the internal reference voltage, R2 need to be kept smaller than 10kΩ. No Load Stability Other than external resistor divider, no minimum load is required to keep the device stable. The device will remain stable and regulated in no load condition. Stability And Phase Margin The output capacitor is required to stabilize and help the transient response of the LDO. The AP7362 is stable with any type of capacitor, with no limitations on minimum or maximum ESR. The device is designed to have excellent transient response for most applications with a small amount of output capacitance. The device is also stable with multiple capacitors in parallel, which can be of any type of value. Additional capacitance helps to reduce undershoot and overshoot during transient loads. This capacitor should be placed as close as possible to OUT and GND pins for optimum performance. Adjustable Operation The AP7362 provides output voltage from 0.6V to 5.0V through external resistor divider as shown below. Any regulator which operates using a feedback loop must be compensated in such a way as to ensure adequate phase margin, which is defined as the difference between the phase shift and -180 degrees at the frequency where the loop gain crosses unity (0 dB). For most LDO regulators, the ESR of the output capacitor is required to create a zero to add enough phase lead to ensure stable operation. The AP7362 has an internal compensation circuit which maintains phase margin regardless of the ESR of the output capacitor, any type of capacitor can be used. Below two charts show the gain/phase plot of the AP7362 with an output of 1.2V, 10 μF ceramic output capacitor, delivering 1.5A load current and no load. It can be seen the phase margin is about 90° (which is very stable). VOUT VIN IN 120 OUT 100 140 PHASE 120 80 AP7362 10µF Enable 60 R1 10µF ADJ EN GND R2 60 20 40 0 -20 -40 -60 -100 20 VIN=2.7V VOUT=1.2V IL=1.5A 0 -20 -40 COUT=10μF CER -120 100 The output voltage is calculated by: 80 40 -80 Adjustable Output 100 GAIN 1k 10k PHASE MARGIN( °) Output Capacitor LOOP GAIN(dB) NEW PRODUCT Input Capacitor -60 100k -80 1M FREQUENCY(Hz) ⎛ R ⎞ VOUT = VREF ⎜⎜ 1 + 1 ⎟⎟ R 2⎠ ⎝ Gain-Bandwidth Plot for 1.5A Load Where VREF=0.6V (the internal reference voltage) Rearranging the equation will give the following that is used for adjusting the output to a particular voltage: AP7362 Document number: DS35058 Rev. 2 - 2 8 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Application Information (cont.) 120 100 60 LOOP GAIN(dB) NEW PRODUCT 40 120 PHASE GAIN -60 -80 The AP7362, consumes only around 0.5mA for all input voltage range and load currents, this provides great power saving in portable and low power applications. 40 0 -40 Low Quiescent Current 80 60 20 -20 100 20 VIN=2.7V VOUT=1.2V IL=0A COUT=10μF CER 0 -20 PHASE MARGIN( °) 80 the heat dissipation of the regulator, protecting it from damage due to overheating. 140 Output Noise This is the integrated value of the output noise over a specified frequency range. Input voltage and output load current are kept constant during the measurement. Results are expressed in μVrms or μV √Hz. The AP7362 is a low noise regulator and needs no external noise reduction capacitor. Output voltage noise is typically 100μVrms overall noise level between 100 Hz and 100 kHz -40 -60 -100 -120 100 1k 10k 100k -80 1M FREQUENCY(Hz) Gain-Bandwidth Plot for no Load Noise is specified in two ways: ON/OFF Input Operation The AP7362 is turned on by setting the EN pin high, and is turned off by pulling it low. If this feature is not used, the EN pin should be tied to IN pin to keep the regulator output on at all time. To ensure proper operation, the signal source used to drive the EN pin must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH. Short Circuit Protection When output current at OUT pin is higher than current limit threshold, the current limit protection will be triggered and clamp the output current to prevent over-current and to protect the regulator from damage due to overheating. Thermal Shutdown Protection Thermal protection disables the output when the junction temperature rises to approximately +170°C, allowing the device to cool down. When the junction temperature reduces to approximately +160°C the output circuitry is enabled again. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. This cycling limits Output noise density is the RMS sum of all noise sources, measured at the regulator output, at a specific frequency (measured with a 1Hz bandwidth). This type of noise is usually plotted on a curve as a function of frequency. Output noise voltage is the RMS sum of spot noise over a specified bandwidth. Spot noise is measured in units μV/√Hz or nV/√Hz and total output noise is measured in μV(rms). The primary source of noise in low-dropout regulators is the internal reference. Power Dissipation The device power dissipation and proper sizing of the thermal plane that is connected to the thermal pad is critical to avoid thermal shutdown and ensure reliable operation. Power dissipation of the device depends on input voltage and load conditions and can be calculated by: PD = (VIN - VOUT) X IOUT The maximum power dissipation, handled by the device, depends on the junction to ambient thermal resistance, and maximum ambient temperature, which can be calculated by the equation in the following: PD _ max = AP7362 Document number: DS35058 Rev. 2 - 2 9 of 13 www.diodes.com ( +150°C - TA ) R θJA June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Ordering Information AP 7362 - XX XX - X NEW PRODUCT Output Blank 10 : 12 : 15 : 18 : 25 : 33 : Device : ADJ 1 .0V 1 .2 V 1 .5 V 1 .8 V 2 .5V 3 .3V Package Code AP7362-XXHA-7 AP7362-XXSP-13 HA SP Package HA : U - DFN 2 0 3 0 -8 SP : SO-8EP Packaging (Note 7) U-DFN2030-8 SO-8EP Packing 7 /13 : Tap e & Reel 7”/13” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 2500/Tape & Reel -13 Notes: 7. 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) U-DFN2030-8 ( Top View ) XX Y WX Device AP7362 Document number: DS35058 Rev. 2 - 2 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 : Internal code Package Identification Code AP7362ADJ U-DFN2030-8 RA AP7362-10 AP7362-12 AP7362-15 AP7362-18 AP7362-25 AP7362-33 U-DFN2030-8 U-DFN2030-8 U-DFN2030-8 U-DFN2030-8 U-DFN2030-8 U-DFN2030-8 RB RC RD RE RF RG 10 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Marking Information (2) SO-8EP ( Top View ) 5 8 YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal code SO-8-EP Logo AP7362-VV YY WW X E Part Number NEW PRODUCT AP7362 for ADJ AP7362-10 for 1.0V AP7362-12 for 1.2V AP7362-15 for 1.5V AP7362-18 for 1.8V AP7362-25 for 2.5V AP7362-33 for 3.3V 1 4 Package Outline Dimensions (All Dimensions in mm) 0.15Typ. (1) Package Type: U-DFN2030-8 0.08 C 1.95/2.05 A 2.95/3.05 1.50/1.70 (Pin #1 ID) CL 8x-0.60 C B 8x-0.30 6x-0.50 Side View CL CL CL 2.60 2X- 0.25 A 0/0.05 Seating Plane 0.57/0.63 8X- 2.60 0.10 C 1.70 TOP MARK Pin1 1.40/1.60 1.60 Land Pattern Recommendation (Unit: mm) Top View 0.25 B 8X0.30/0.60 2X- AP7362 Document number: DS35058 Rev. 2 - 2 0.50Typ. 0.20/0.30 0.10 C A B Bottom View 11 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR Package Outline Dimensions (cont.) (All Dimensions in mm) (2) Package Type: SO-8EP Detail "A" Exposed pad 2.4Ref. 3.70/4.10 45° NEW PRODUCT 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) Notes: 8. Co planarity applies to the exposed heat sink slug as well as the terminals. AP7362 Document number: DS35058 Rev. 2 - 2 12 of 13 www.diodes.com June 2011 © Diodes Incorporated AP7362 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR 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). NEW PRODUCT 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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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 © 2011, Diodes Incorporated www.diodes.com AP7362 Document number: DS35058 Rev. 2 - 2 13 of 13 www.diodes.com June 2011 © Diodes Incorporated