AP7311

Document overview

  • Manufacturer or author: Diodes Incorporated
  • PDF pages: 13

Technical content

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 1 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated

  • 150mA Low Dropout Regulator with EN
  • Very low I Q 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 at 100Hz
  • Fast start-up time: 80µs
  • Stable with low ESR, 1µF ceramic output capacitor
  • Excellent Load/Line Transient Response
  • Low dropout: 150mV typical at 150mA
  • Current limit protection
  • Short circuit protection
  • Thermal shutdown protection
  • Ambient temperature range: -40ºC to 85°C
  • SOT25: Available in “Green” Molding Compound (No Br, Sb)
  • Lead Free Finish/RoHS Compliant (Note 1) The AP7311 is a 150mA, 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. 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. Built-in current-limit and thermal-shutdown functions prevent IC from damage in fault conditions. The AP7311 is available in SOT25 package.
  • Notebook and Desktop Computers and Pheripherals
  • Portable Devices
  • Battery Powered Devices
  • CD-ROM, DVD and LAN Cards Typical Application Circuit 1uF IN GND EN OUT Enable 1uF VIN VOUT AP7311 Fixed Output 1uF IN GND EN OUT Enable ADJ 1uF VIN VOUT AP7311 Adjustable Output Features Description

Applications

⎛ + = REFOUT R R1 V V

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 2 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated

Ordering Information

W : SOT25 G : Green 7 : Tape & ReelBlank : ADJ 10 : 1.0V Output 12 : 1.2V 15 : 1.5V 18 : 1.8V 25 : 2.5V 28 : 2.8V 30 : 3.0V 33 : 3.3V 20 : 2.0V Device Package Code Packaging (Note 2) 7” Tape and Reel Quantity Part Number Suffix AP7311-XXWG-7 W SOT25 3000/Tape & Reel -7 Notes: 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.

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 3 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated Pin Assignment (1) SOT25 (Fixed Output) (2) SOT25 (Adj Output) IN EN OUT ( Top View ) GND NC4 IN EN OUT ( Top View ) GND ADJ4 Pin Descriptions Pin Name Pin Number Description SOT25 (fixed) SOT25 (adj) IN 1 1 Voltage input pin. Bypass to ground through at least 1µF capacitor GND 2 2 Ground EN 3 3 Enable input, active high ADJ - 4 Output feedback pin NC 4 - No connection OUT 5 5 Voltage output pin. Bypass to ground through 1µF ceramic capacitor

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 4 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated Functional Block Diagram IN EN GND OUT Gate Driver 0.4V Current Limit and Thermal Shutdown Fixed Version R R IN EN GND ADJ OUT Gate Driver 0.4V Current Limit and Thermal Shutdown Adjustable Version Absolute Maximum Ratings Symbol Parameter Ratings Units ESD HBM Human Body Model ESD Protection 6 kV ESD MM Machine Model ESD Protection 400 V VIN Input Voltage 7 V EN Voltage VIN + 0.3 V Continuous Load Current Internal Limited TOP Operating Junction Temperature Range -40 ~ 125 °C TST Storage Temperature Range -65 ~150 °C PD Power Dissipation (Note 3) SOT25 640 mW TJ Maximum Junction Temperature 150 °C Recommended Operating Conditions Symbol Parameter Min Max Unit VIN Input voltage 2 6 V IOUT Output Current (Note 4) 0 150 mA TA Operating Ambient Temperature -40 85 °C Notes: 3. Ratings apply to ambient temperature at 25°C 4. The device maintains a stable, regulated output voltage without a load current.

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 5 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated

Electrical Characteristics

(TA = 25 o C, VIN = VOUT +1V, CIN = 1uF, COUT = 1uF, VEN = 2V, unless otherwise stated) Symbol Parameter Test Conditions Min Typ. Max Unit IQ Input Quiescent Current VEN = VIN, IOUT = 0mA ⎯ 55 75 μA VEN = VIN, IOUT = 150mA 65 85 ISHDN Input Shutdown Current VEN = 0V, IOUT = 0mA ⎯ 1 μA ILEAK Input Leakage Current VEN = 0V, OUT grounded ⎯ 1 μA VDropout Dropout Voltage (Note 5) IOUT = 150mA 150 300 mV VREF ADJ Reference Voltage (Adjustable version) IOUT= 0mA 0.4 V IADJ ADJ Leakage (Adjustable version) ⎯ 1 μA VOUT Output Voltage Accuracy TA = -40oC to 85oC, IOUT = 30mA -2 2 % ΔVOUT /ΔVIN/V Line Regulation VIN = (VOUT +1V) to VIN-Max, VEN = VIN, IOUT = 1mA 0.01 0.20 %/V ΔVOUT /VOUT Load Regulation VIN = (VOUT +1V) to VIN-Max, IOUT from 1mA to 150mA -0.6 0.6 % tST Start-up Time VEN = 0V to 2.0V, VOUT = 1.8V IOUT = 150mA 80 μs PSRR PSRR VIN = [VOUT +1V]VDC + 0.5VppAC, f = 100Hz, IOUT = 30mA 65 dB ISHORT Short-circuit Current V IN = VIN-Min to VIN-Max, VOUT < 0.2V 50 mA ILIMIT Current Limit VIN = (VOUT +1V) to VIN-Max, VOUT/ROUT = 0.5A 200 300 mA VIL EN Input Logic Low Voltage VIN = VIN-Min to VIN-Max 0.4 V VIH EN Input Logic High Voltage VIN = VIN-Min to VIN-Max 1.4 V IEN EN Input Current VIN = 0V or VIN-Max -1 1 μA TSHDN Thermal Shutdown Threshold 140 °C THYS Thermal Shutdown Hysteresis 15 °C θJA Thermal Resistance Junction-to-Ambient SOT25 (Note 6) 190 oC/W Notes: 5. Dropout voltage is the voltage difference between the input and the output at which the output voltage drops 2% bel ow its nominal value. This parameter only applies to output voltages above 1.8V. 6. Test conditions for SOT25: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, single sided

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 6 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated Typical Performance Characteristics Quiescent Current vs Input Voltage Iload=150mA Input Voltage (V) Quiescent Current (uA) Quiescent Current vs Input Voltage Iload=0mA Input Voltage (V) Quiescent Current (uA) Reference Voltage vs Input Voltage 0.39 0.395 0.4 0.405 0.41 2 2.5 3 3.5 4 4.5 5 5.5 6 Input Voltage (V) Reference Voltage (V) Line Regulation (%/V) 0.01 0.02 0.03 0.04 0.05 0.06 Input Voltage (V) Output Voltage Variation (%) Load Regulation (%) -0.4 0.4 0.8 1.2 1.6 2.4 0 30 60 90 120 150 Output Current (mA) Output Voltage Variation (%) Dropout Voltage 120 160 200 0 25 50 75 100 125 150 Output Current (mA) Dropout Voltage (mV) 90℃ -45℃ 25℃ 90℃ 90℃ 25℃ 25℃ -45℃ 90℃ 25℃ -45℃ 25℃ -45℃ 90℃ 90℃ -45℃ 25℃ -45℃ Vout=1.8V Vout=1.8V Vout=1.8V Vin=Vout +1V Vout=1.8V Vin=Vout +1V Vout=2.5V

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 7 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated Typical Performance Characteristics (Continued) Short Circuit vs Input Voltage Input Voltage (V) Output Current (mA) Current Limit vs Input Voltage 280 290 300 310 320 330 340 350 360 Input Voltage (V) Current Limit (mA) PSRR 0.1 1 10 100 Frequency (kHz) PSRR (dB) PSRR 0.1 1 10 100 Frequency (kHz) PSRR (dB) 90℃ -45℃ 25℃ Vout=0.8V Ta=25℃ Vout=1.8V Vout=0.8V Vin=5V Cin=Cout=1uF Ta=25℃ Vout=1.8V Vin=2.8V Cin=Cout=1uF Ta=25℃

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 8 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated Typical Performance Characteristics (Continued) Start-Up Time (No Load) Time (50us/div) Start-Up Time (150mA Load) Time (50us/div) Line Transient Response Time (50us/div) Line Transient Response Time (50us/div) Ven=0 to 2V (1V/div) Vin=2.8V Cin=Cout=1uF Vout=1.8V (1V/div) Ven=0 to 2V (1V/div) Vin=2.8V Cin=Cout=1uF Vout=1.8V (1V/div) Vout=1.8V (50mV/div) Iout=150mA (150mA/div) Vin=3.8V to 2.8V (1V/div) Tf=15us Vin=2.8V to 3.8V (1V/div) Tr=15us Vout=1.8V (50mV/div) Iout=150mA (150mA/div) Iout=150mA (150mA/div)

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 9 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated Typical Performance Characteristics (Continued) Load Transient Response Time (50us/div) Load Transient Response Time (50us/div) Iout=1mA to 150mA (50mA/div) Vout=1.8V (100mV/div) Tr=Tf=15us Vin=2.8V Vout=5.0V (100mV/div) Iout=1mA to 150mA (50mA/div) Tr=Tf=15us Vin=6V

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 10 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated Application Note Input Capacitor 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. Output Capacitor The output capacitor is required to stabilize and help transient response for LDO. The AP7311 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. Adjustable Operation The AP7311 provides output voltage from 0.8V to 5.0V through external resistor divider as shown below. 1uF IN GND EN OUT Enable ADJ 1uF VIN VOUT AP7331 The output voltage is calculated by: ⎛ + = REFOUT R R1 V V 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: ⎛ −= 1V VR R REF OUT 2 1 To maintain the stability of the internal reference voltage, R 2 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. ON/OFF Input Operation The AP7311 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. Current Limit 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 approximately 300mA to prevent over-current and to protect the regulator from damage due to overheating. 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 50mA. This feature protects the regulator from over-current and damage due to overheating. 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 AP7311 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. 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. The AP7311’s fast transient response from 0 to 150mA provides stable voltage supply for fast DSP and GSM chipset with fast changing load. Small Overshoot and Undershoot The AP7311 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 AP7311. Low Quiescent Current The AP7311, consuming only around 65µA for all input range and output loading, provides great power saving in portable and low power applications. Wide Output Range The AP7311, with a wide output range of 0.8V to 5.0V, provides a versatile LDO solution for many portable applications.

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 11 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated Marking Information (1) SOT25 1 2 3 XX Y W X ( Top View ) XX : Identification code W : Week : A~Z : 1~26 week; X : A~Z : Green Y : Year 0~9 a~z : 27~52 week; z represents 52 and 53 week Device Package Identification Code AP7311-ADJ SOT25 RM AP7311-10 SOT25 RN AP7311-12 SOT25 RP AP7311-15 SOT25 RR AP7311-18 SOT25 RS AP7311-20 SOT25 RT AP7311-25 SOT25 RU AP7311-28 SOT25 RV AP7311-30 SOT25 RW AP7311-33 SOT25 RX

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 12 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated Package Information (All Dimensions in mm) (1) Package Type: SOT25

150mA, Low Quiescent Current, Fast Transient Low Dropout Linear Regulator AP7311 Rev. 2 13 of 13 NOVEMBER 2009 www.diodes.com © Diodes Incorporated 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. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorpora ted convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. 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