AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Description Pin Assignments The AP7331 is a 300mA, adjustable and fixed output voltage, low dropout linear regulator. The device included pass element, error amplifier, band-gap, current limit and thermal shutdown circuitry. The device is turned on when EN pin is set to logic high level. SOT25 (Fixed Output) SOT25 (ADJ Output) (Top View) (Top View) IN 1 5 OUT The characteristics of low dropout voltage and low quiescent current make it suitable for low power applications, for example, battery powered devices. The typical quiescent current is approximately 65μA. GND 2 Built-in current-limit and thermal-shutdown functions prevent IC from damage in fault conditions. DFN2020-6 (Fixed Output) DFN2020-6 (ADJ Output) (Top View) (Top View) EN 3 The AP7331 is available in SOT25 and DFN2020-6 packages. 4 NC EN 1 6 NC EN 1 GND 2 5 NC GND 2 IN 3 Features Applications • • • • • • • • • • • • • • • • • 300mA Low Dropout Regulator with EN Very low IQ over full load: 65µA Wide input voltage range: 2V to 6V Wide adjustable output: 0.8V to 5.0V Fixed output options: 1.0V to 3.3V PSRR: 65dB typical at 100Hz Fast start-up time: 80µs Stable with low ESR, 1µF ceramic output capacitor Excellent Load/Line Transient Response Low dropout: 300mV typical at 300mA Current limit protection Short circuit protection Thermal shutdown protection Ambient temperature range: -40ºC to 85°C SOT25 and DFN2020-6: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/RoHS Compliant (Note 1) Notes: • • • 4 OUT IN 3 6 ADJ 5 NC 4 OUT XDSL Routers Wireless LAN Cards Desktop and Notebook Computers Battery Powered Equipments 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 AP7331 Document number: DS31914 Rev. 3 - 2 1 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Typical Application Circuit VIN VOUT IN VIN VOUT OUT IN AP7331 1uF Enable OUT AP7331 R1 1uF 1uF 1uF Enable EN ADJ EN GND GND R2 Adjustable Output Fixed Output ⎛ R ⎞ VOUT = VREF ⎜⎜ 1 + 1 ⎟⎟ R2 ⎠ ⎝ Pin Descriptions Pin Number DFN2020-6 SOT25 (fixed) (adj) Pin Name SOT25 (fixed) IN 1 3 1 3 GND EN ADJ NC 2 3 4 2 1 5, 6 2 3 4 - 2 1 6 5 OUT 5 4 5 4 Description DFN2020-6 (adj) Voltage input pin. Bypass to ground through at least 1µF capacitor Ground Enable input, active high Output feedback pin No connection Voltage output pin. Bypass to ground through 1µF ceramic capacitor Functional Block Diagram OUT IN EN Gate Driver Current Limit and Thermal Shutdown IN EN R OUT Gate Driver Current Limit and Thermal Shutdown ADJ 0.4V 0.4V R GND GND Fixed Version AP7331 Document number: DS31914 Rev. 3 - 2 Adjustable Version 2 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Absolute Maximum Ratings Symbol ESD HBM Parameter Human Body Model ESD Protection ESD MM VIN TOP TST Machine Model ESD Protection Input Voltage EN Voltage Continuous Load Current Operating Junction Temperature Range Storage Temperature Range PD Power Dissipation (Note 2) TJ Maximum Junction Temperature SOT25 DFN2020-6 Ratings 6 Units kV 400 7 VIN + 0.3 Internal Limited -40 ~ 125 -65 ~150 640 740 V V V °C °C mW mW 150 °C Recommended Operating Conditions Symbol VIN IOUT TA Notes: Parameter Input voltage Output Current (Note 3) Operating Ambient Temperature Min 2 0 -40 Max 6 300 85 Unit V mA °C 2. Ratings apply to ambient temperature at 25°C 3. The device maintains a stable, regulated output voltage without a load current. AP7331 Document number: DS31914 Rev. 3 - 2 3 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Electrical Characteristics (TA = 25oC, VIN = VOUT +1V, CIN = 1uF, COUT = 1uF, VEN = 2V, unless otherwise stated) Symbol Parameter Test Conditions VEN = VIN, IOUT = 0mA IQ Input Quiescent Current VEN = VIN, IOUT = 300mA ISHDN Input Shutdown Current VEN = 0V, IOUT = 0mA ILEAK Input Leakage Current VEN = 0V, OUT grounded VDropout Dropout Voltage (Note 4) IOUT = 300mA VREF ADJ Reference Voltage (Adjustable version) IOUT= 0mA IADJ ADJ Leakage (Adjustable version) TA = -40oC to 85oC, VOUT Output Voltage Accuracy IOUT = 30mA VIN = (VOUT +1V) to VIN-Max, ΔVOUT Line Regulation VEN = VIN, IOUT = 1mA /ΔVIN/V VIN = (VOUT +1V) to VIN-Max, ΔVOUT Load Regulation IOUT from 1mA to 300mA /VOUT VEN = 0V to 2.0V, VOUT = 1V, tST Start-up Time IOUT = 300mA VIN = [VOUT +1V]VDC + 0.5VppAC, PSRR PSRR f = 100Hz, IOUT =30mA VIN = VIN-Min to VIN-Max, ISHORT Short-circuit Current VOUT < 0.2V ILIMIT Current Limit VOUT/ROUT = 1A VIL EN Input Logic Low Voltage VIN = VIN-Min to VIN-Max VIH EN Input Logic High Voltage VIN = VIN-Min to VIN-Max IEN EN Input Current VIN = 0V or VIN-Max TSHDN Thermal Shutdown Threshold THYS Thermal Shutdown Hysteresis SOT25 (Note 5) θJA Thermal Resistance Junction-to-Ambient DFN2020-6 (Note 6) Notes: Min ⎯ Typ. 55 65 ⎯ ⎯ Max 75 85 1 1 550 Unit μA ⎯ 1 μA μA mV V μA -2 2 % 0.20 %/V 0.6 % 300 0.4 0.01 -0.6 400 80 μs 65 dB 100 mA 600 0.4 1.4 -1 1 140 15 190 167 mA V V μA °C °C o C/W o C/W 4. Dropout voltage is the voltage difference between the input and the output at which the output voltage drops 2% below its nominal value. This parameter only applies to output voltages above 1.8V. 5. Test conditions for SOT25: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, single sided 6. Test conditions for DFN2020-6: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, double sided, bottom layer is a copper plane. AP7331 Document number: DS31914 Rev. 3 - 2 4 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Typical Characteristics Quiescent Current vs Input Voltage Iload=0mA Quiescent Current vs Input Voltage Iload=300mA 62 56 Quiescent Current (uA) Quiescent Current (uA) VOUT = 3.3V 61 90°C 60 59 58 57 -45°C 25°C C 56 55 VOUT = 3.3V 54 52 50 48 46 25°C 44 4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 4.3 6.1 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1 5.9 6.1 Input Voltage (V) Input Voltage (V) Reference Voltage vs Input Voltage Line Regulation (% /V) 0.41 0.1 Output Voltage Variation (%/V) -45°C 0.405 0.4 0.395 0.39 90°C 25°C 0.385 VOUT = 3.3V VIN = VOUT +1V 0.08 90°C 0.06 0.04 -45°C 0.02 0.38 25°C 0 4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1 4.3 4.5 4.7 4.9 Input Voltage (V) 5.1 5.3 5.5 5.7 Input Voltage (V) Dropout Voltage Load Regulation (% ) 0.6 400 VOUT = 3.3V VIN = VOUT + 1V 0.4 0.2 0 -0.2 -45°C VOUT = 3.3V 350 Dropout Voltage (mV) Output Voltage Variation (%) -45°C 42 54 Reference Voltage (V) 90°C 25°C 90°C -0.4 90°C 300 250 25°C C 200 150 100 -45°C 50 -0.6 0 50 100 150 200 250 300 Output Current (mA) AP7331 Document number: DS31914 Rev. 3 - 2 0 0 50 100 150 200 250 300 Output Current (mA) 5 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Typical Characteristics (Continued) Current Limit vs Input Voltage Short Circuit vs Input Voltage 115 600 Current Limit (mA) 110 Output Current (mA) -45°C VOUT=3.3V 105 100 95 90 85 25°C C 80 3.5 TA = 25°C VOUT = 1.8V 550 500 450 90°C 400 4 4.5 5 5.5 2.8 6 3.2 3.6 4 PSRR 4.8 5.2 5.6 6 PSRR 70 70 VOUT = 1.8V VIN = 2.8V CIN = COUT = 1uF TA = 25°C 60 VOUT = 3.3V VIN = 4.3V CIN = COUT = 1uF TA = 25°C 65 60 PSRR (dB) 65 PSRR (dB) 4.4 Input Voltage (V) Input Voltage (V) 55 50 45 40 55 50 45 40 35 35 0.1 1 10 100 Frequency (kHz) AP7331 Document number: DS31914 Rev. 3 - 2 0.1 1 10 100 Frequency (kHz) 6 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Typical Characteristics (Continued) Start-Up Time (No Load) Start-Up Time (300mA Load) VEN = 0 to 2V (1V/div) VIN = 4.3V CIN = COUT =1uF VEN = 0 to 2V (1V/div) VIN = 4.3V CIN = COUT =1uF VOUT = 3.3V (1V/div) VOUT = 3.3V (1V/div) IOUT = 300mA (300mA/div) Time (50us/div) Time (50us/div) Line Transient Response Line Transient Response VIN = 5.3V to 4.3V (1V/div) Tf =1 0us VIN =4.3V to 5.3V (1V/div) Tr = 10us VOUT = 3.3V (50mV/div) VOUT = 3.3V (50mV/div) IOUT = 300mA (300mA/div) IOUT = 300mA (300mA/div) Time (50us/div) Time (50us/div) Load Transient Response Load Transient Response VOUT = 3.3V (100mV/div) VOUT = 0.8V (100mV/div) IOUT = 1mA to 300mA (100mA/div) IOUT = 1mA to 300mA (100mA/div) Tr = Tf = 10us VIN =4.3V Time (100us/div) Time (100us/div) AP7331 Document number: DS31914 Rev. 3 - 2 Tr = Tf = 10us VIN = 2V 7 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Application Note Input Capacitor ON/OFF Input Operation A 1μF ceramic capacitor is recommended to connect between VIN and GND pins to decouple input power supply glitch and noise. The amount of the capacitance may be increased without limit. This input capacitor must be located as close as possible to the device to assure input stability and less noise. For PCB layout, a wide copper trace is required for both VIN and GND. A lower ESR capacitor allows the use of less capacitance, while higher ESR type requires more capacitance. The AP7331 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 Output Capacitor Current Limit Protection The output capacitor is required to stabilize and help transient response for LDO. The AP7331 is stable with very small ceramic output capacitors. The recommended capacitance is from 1μF to 4.7μF, Equivalent Series Resistance (ESR) is from 10mΩ to 200mΩ, and temperature characteristic is X7R or X5R. Higher capacitance values help to improve load/line transient response. The output capacitance may be increased to keep low undershoot/overshoot. Place output capacitor as close as possible to OUT and GND pins, and keep the leads as short as possible. 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 approximately 600mA to prevent over-current and to protect the regulator from damage due to overheating. Characteristics section under VIL and VIH. Short Circuit Protection When OUT pin is short-circuit to GND or OUT pin voltage is less than 200mV, short circuit protection will be triggered and clamp the output current to approximately 100mA. This feature protects the regulator from overcurrent and damage due to overheating. Adjustable Operation The AP7331 provides output voltage from 0.8V to 5.0V through external resistor divider as shown below. V IN V OUT IN OUT A P 73 3 1 1uF E n a ble R1 1uF ADJ EN GND R2 Thermal Shutdown Protection Thermal protection disables the output when the junction temperature rises to approximately +140°C, allowing the device to cool down. When the junction temperature reduces to approximately +125°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 the heat dissipation of the regulator, protecting it from damage due to overheating. Ultra Fast Start-up After enabled, the AP7331 is able to provide full power in as little as tens of microseconds, typically 80µs, without sacrificing low ground current. This feature will help load circuitry move in and out of standby mode in real time, eventually extend battery life for mobile phones and other portable devices. The output voltage is calculated by: ⎛ R ⎞ VOUT = VREF ⎜⎜1 + 1 ⎟⎟ R 2⎠ ⎝ Where VREF=0.4V (the internal reference voltage) Rearranging the equation will give the following that is used for adjusting the output to a particular voltage: ⎞ ⎛V R1 = R 2 ⎜⎜ OUT − 1⎟⎟ V ⎠ ⎝ REF To maintain the stability of the internal reference voltage, R2 need to be kept smaller than 125kΩ. 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. AP7331 Document number: DS31914 Rev. 3 - 2 Fast Transient Response Fast transient response LDOs can extend battery life. TDMA-based cell phone protocols such as Global System for Mobile Communications (GSM) have a transmit/receive duty factor of only 12.5 percent, enabling power savings by putting much of the baseband circuitry into standby mode in between transmit cycles. In baseband circuits, the load often transitions virtually instantaneously from 100µA to 100mA. To meet this load requirement, the LDO must react very quickly without a large voltage drop or overshoot — a requirement that cannot be met with conventional, general-purpose LDOs. 8 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Application Note (Continued) Fast Transient Response (Continued) Low Quiescent Current The AP7331’s fast transient response from 0 to 300mA provides stable voltage supply for fast DSP and GSM chipset with fast changing load. The AP7331, consuming only around 65µA for all input range and output loading, provides great power saving in portable and low power applications. Small Overshoot and Undershoot Wide Output Range The AP7331 has small and controlled overshoot and undershoot in load and line transitions. This helps to protect supplied circuit from damage and operation error caused by glitches. This feature also permits the usage of small value output decoupling capacitor with AP7331. The AP7331, with a wide output range of 0.8V to 5.0V, provides a versatile LDO solution for many portable applications. Ordering Information AP7331 - XX XX G - 7 Output Blank : ADJ 10 : 1.0V 12 : 1.2V 15 : 1.5V 18 : 1.8V 20 : 2.0V 25 : 2.5V 28 : 2.8V 30 : 3.0V 33 : 3.3V Package Green Packing W : SOT25 SN : DFN2020-6 G : Green 7 : Tape & Reel Device Package Code Packaging (Note 7) AP7331-XXWG-7 AP7331-XXSNG-7 W SN SOT25 DFN2020-6 Note: 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 3000/Tape & Reel -7 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. SOT25 AP7331 Document number: DS31914 Rev. 3 - 2 9 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR ( Top View ) 4 7 5 XX Y W X 1 2 3 Device AP7331-ADJ AP7331-10 AP7331-12 AP7331-15 AP7331-18 AP7331-20 AP7331-25 AP7331-28 AP7331-30 AP7331-33 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 Package SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 SOT25 Identification Code QJ QK QL QM QN QT QP QQ QR QS 2. DFN2020-6 ( Top View ) XX Y WX Device AP7331-ADJ AP7331-10 AP7331-12 AP7331-15 AP7331-18 AP7331-20 AP7331-25 AP7331-28 AP7331-30 AP7331-33 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 Package DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 DFN2020-6 Identification Code QJ QK QL QM QN QT QP QQ QR QS Package Outline Dimensions (All Dimensions in mm) 1. Package Type: SOT25 AP7331 Document number: DS31914 Rev. 3 - 2 10 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR 0.43mon. 0.57/0.63 2. Package Type: DFN2020-6 Marking 0.05 C 2x 0/0.05 0.15max. 0.15 C 0.08 C Seating plane C 1.95/2.075 A 0.30/0.40 1.45/1.65 0.76/0.96 1.95/2.075 B (Active area depth) .1 R0 2x- 0.15 C 0.65nom. 0.2/0.3 Bottom View 0.05 M C A B Pin#1 ID Tape Orientation (Note 8) DFN2020-6 AP7331 Document number: DS31914 Rev. 3 - 2 11 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Notes: 8. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf AP7331 Document number: DS31914 Rev. 3 - 2 12 of 13 www.diodes.com January 2011 © Diodes Incorporated AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT 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). 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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