AP7168

AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Description The AP7168 is a 1.2A, adjustable output voltage, ultra-low dropout linear regulator. The device includes pass element, error amplifier, band-gap reference, current limit and thermal shutdown circuitry. The device is turned on when EN pin is set to logic high level. A Power-OK (POK) output is available for power sequence control. The characteristics of the low dropout voltage and low quiescent current make it suitable for low to medium power applications, for example, laptop computers, audio and video applications, and battery powered devices. The typical quiescent current is approximately 125µA. Built-in current-limit and thermal-shutdown functions prevent IC from damage in fault conditions. The AP7168 is available in SO-8EP package. Pin Assignments ( Top View ) IN POK NC EN 1 2 3 4 8 7 6 5 OUT FB NC GND N EW PRODUCT SO-8EP Features • • • • • • • • • • • • • • Wide input voltage range: 2.2V – 5.5V 230mV very low dropout at 500mA load 500mV very low dropout at 1A load Very low quiescent current (IQ): 125µA typical Adjustable output voltage range: 0.8V to 5.0V Very fast transient response High PSRR Accurate voltage regulation Current limiting and short circuit protection Thermal shutdown protection Stable with any type output capacitor ≥ 4.7µF Ambient temperature range -40ºC to 85°C SO-8EP: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) Applications • • • • • • Servers and laptops Smart phone and PDA MP3/MP4 Bluetooth headset Low and medium power applications FPGA and DSP core or I/O power 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. Typical Application Circuit VIN IN 100kOhm 1µ F POK AP7168 FB R2 Enable EN GND R1 10µF OUT VOUT ⎛ R⎞ VOUT = VREF ⎜1 + 1 ⎟ ⎜ R⎟ 2⎠ ⎝ AP7168 Document number: DS32019 Rev. 2 - 2 1 of 11 www.diodes.com September 2010 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Pin Descriptions Name IN POK EN GND FB OUT NC Pin Number 1 2 4 5 7 8 3, 6 Description Voltage input pins, to be tied together externally. Bypass to ground through at least 1µF capacitor. Power-OK output, active-high open-drain. Enable input, active high. Ground. Output feedback. Voltage output pins, to be tied together externally. Bypass to ground through at least 4.7µF ceramic capacitor. No connection. N EW PRODUCT Functional Block Diagram IN Current Limit and Thermal Shutdown OUT EN Gate Driver FB POK 0.8V 0.744V GND Absolute Maximum Ratings Symbol ESD HBM ESD MM VIN Parameter Human Body Model ESD Protection Machine Model ESD Protection Input Voltage OUT, FB, POK, EN Voltage Continuous Load Current Operating Junction Temperature Range Storage Temperature Range Power Dissipation SO-8EP (Note 2, 4) Ratings 4 300 7 VIN + 0.3 Internal Limited -40 ~ 150 -65 ~150 4.0 Unit KV V V V °C °C W TJ TST PD Notes: 2. Ratings apply to ambient temperature at 25°C Recommended Operating Conditions Symbol VIN IOUT TA Parameter Input voltage Output Current Operating Ambient Temperature 2 of 11 www.diodes.com Min 2.2 0 -40 Max 5.5 1.2 85 Unit V A °C September 2010 © Diodes Incorporated AP7168 Document number: DS32019 Rev. 2 - 2 AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Electrical Characteristics (TA = 25 C, VIN = VOUT +1V, CIN = 1μF, COUT = 1μF, VEN = 2V, unless otherwise stated) Symbol Parameter Test Conditions IQ ISHDN VDropout VREF IFB VOUT Input Quiescent Current Input Shutdown Current Dropout Voltage FB reference voltage FB leakage Output Voltage Total Accuracy Line Regulation Load Regulation Start-up Time, from EN high to POK high Power Supply Rejection Ratio Current limit Short-circuit Current EN Input Logic Low Voltage EN Input Logic High Voltage EN Input leakage POK output low voltage VIN = VOUT +1V to 5.5V, IOUT = 1mA IOUT from 1mA to 1A VEN = 0V to 2.0V, IOUT = 100mA, VIN = 3.3V 1kHz, VIN = 3.3V, VOUT = 1.2V, IOUT = 100mA VOUT = 1.8V, ROUT = 0.5Ω VIN = 3.3V, VOUT < 0.2V -1.5 190 60 1.2 1.6 750 0.4 1.4 ⎯ 87% 0.01 100 92% 4% 160 0.01 145 25 27 1 200 97% IOUT= 0 VEN = 0V, IOUT = 0 (Note 3) VOUT ≥ 1.5V, IOUT = 0.5A VOUT ≥ 1.5V, IOUT = 1A o Min ⎯ -1 Typ. 125 0.1 230 500 0.8 0.01 Max 180 1 800 1 3 Unit µA µA mV mV V µA % %/V N EW PRODUCT ⎯ -3 ΔVOUT / VOUT ΔVIN ΔVOUT / VOUT tST PSRR ILIMIT ISHORT VIL VIH IEN VOL VPOK_TH_UP VPOK_Hys POK deglitch IPOK_LK TSHDN THYS θJA Notes: 0.02 1.5 % µs dB A mA V V µA mV Vref Vref µs µA °C °C o VEN = 0V or 5.5V Force 2mA FB (or OUT for fixed version) Output voltage (rising) POK threshold rising Output voltage POK hysteresis VIN = 3.3V, VOUT = 1.2V POK leakage current VPOK = 5.5V Thermal shutdown threshold Thermal shutdown hysteresis Thermal Resistance Junction-toSOP-8L-EP (Note 4) Ambient ⎯ 1 C/W 3. POK pin must be disconnected from IN pin. 4. Test condition for SO-8EP: Device mounted on 2" x 2" FR-4 substrate PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane. AP7168 Document number: DS32019 Rev. 2 - 2 3 of 11 www.diodes.com September 2010 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Typical Performance Characteristics Output Voltage vs. Temperature 3.40 Output Voltage vs. Tem perature 1.30 VOUT = 3.3V VOUT = 1.2V 3.35 Output Voltage (V) Output Voltage (V) 1.25 3.30 1.20 N EW PRODUCT 3.25 1.15 3.20 -50 -25 0 25 50 75 100 125 1.10 -50 -25 0 25 50 75 100 125 Temperature ( C) 0 Tem perature ( 0C) Quiescent Current vs. Input Voltage 170 Quiescent Current vs. IOUT Quiescent Current ( μ A) 170 160 150 140 130 120 110 100 VIN=2.5V VIN=3.3V 0.0 0.2 0.4 0.6 0.8 1.0 1.2 VOUT=3.3V VOUT=1.8V Quiescent Current (μA) 155 140 125 110 95 Iout=0mA Iout=500mA 80 4.0 4.3 4.6 4.9 5.2 5.5 Input Voltage (V) IOUT ( A) Quiescent Current vs. Tem perature 170 0.810 Reference Voltage vs. Temperature Quiescent Current ( π A) 155 Reference Voltage (V) 0.805 140 125 0.800 110 VIN=2.2V, Vout=1.0V 95 VIN=3.3V, Vout=1.8V VIN=5.0V, Vout=3.3V 80 -50.0 -25.0 0.0 25.0 50.0 75.0 100.0 125.0 0.795 Vin=2.2V Vin=3.3V Vin=5.5V 0.790 -50 -25 0 25 50 75 100 125 Tem perature ( 0C) Temperature ( C) 0 AP7168 Document number: DS32019 Rev. 2 - 2 4 of 11 www.diodes.com September 2010 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Typical Performance Characteristics (Continued) Line Regulation VOUT=1.8V, IOUT=1mA 0.10 0.5 25°C Load Regulation VIN=2.2V, VOUT=1.2V, Change in V OUT ( %/V) Change in V OUT ( %) 0.4 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 85°C -40°C 0.05 0.00 N EW PRODUCT -0.05 25°C 85°C -40°C -0.10 3.0 3.5 4.0 4.5 5.0 5.5 0.0 0.4 0.8 1.2 V IN ( V) IOUT ( A) Short Circuit Current vs. Input Voltage 0.77 Short Circuit Current vs. Temperature 0.80 VOUT=1.2V VOUT=1.2V Short Circuit Current (A) 0.76 0.75 0.74 0.73 0.72 0.71 0.70 0.69 2.2 2.4 2.6 2.8 3 3.2 3.4 Short Circuit Current (A) 0.75 0.70 0.65 0.60 -50 -25 0 25 50 75 Input Voltage (V) Temperature ( C) o Dropout Voltage vs. IOUT VOUT=3.3V 700 PSRR -40 -45 -50 PS RR (dB) 25°C 85°C -40°C Dropout Voltage (mV) 600 500 -55 -60 -65 -70 -75 -80 100 400 300 200 100 0 0 0.2 0.4 0.6 0.8 1 1.2 IOUT(A) 1000 10000 Frequency (Hz) 100000 AP7168 Document number: DS32019 Rev. 2 - 2 5 of 11 www.diodes.com September 2010 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Typical Performance Characteristics (Continued) Line Transient Response VIN =3V to 5.5V COUT =10uF (Ceramic) Line Transient Response VIN =5.5V to 3V COUT =10uF (Ceramic) VIN 2V/div VIN 2V/div N EW PRODUCT VOUT 50mV/div VOUT 50mV/div Time (5ms/div) Output Load Transient Response (VOUT=1.8V) COUT=470uF (electrolytic) Time (500us/div) Output Load Transient Response (VOUT=3.3V) COUT=470uF (electrolytic) VOUT 100mV/div COUT=10uF (Ceramic) VOUT 100mV/div COUT=10uF (Ceramic) COUT=1uF (Ceramic) COUT=1uF (Ceramic) 1.2A IOU 500mA/div 50mA 1A/us IOU 500mA/div 50mA 1.2A 1A/us Time (100us/div) Start-up Time (VOUT=1.2V, IOUT=0.1A) Time (100us/div) Start-up Time (VOUT=1.2V, IOUT=1.2A) VEN 2V/div VEN 2V/div COUT=10uF VOUT 1V/div VOUT 1V/div COUT=10uF VPOK 2V/div VPOK 2V/div Time (50us/div) Time (50us/div) AP7168 Document number: DS32019 Rev. 2 - 2 6 of 11 www.diodes.com September 2010 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Typical Performance Characteristics (Continued) Current Limit vs. Temperature 1.8 Current Limit (A) 1.7 1.6 N EW PRODUCT 1.5 VIN =2.8V,Vout=1.8V VIN =3.3V,Vout=1.8V 1.4 -50 -25 0 25 50 75 100 Temperature ( C) o Application Note Input Capacitor A 1μF ceramic capacitor is recommended to connect between IN and GND pins to decouple input power supply glitch and noise. The amount of the capacitance may be increased without limit. A lower ESR (Equivalent Series Resistance) capacitor allows the use of less capacitance, while higher ESR type requires more capacitance. This input capacitor should 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 IN and GND. VIN IN OUT VOUT CIN 100kOhm AP7168 POK FB R1 COUT R2 Enable EN GND Output Capacitor The output capacitor is required to stabilize and help the transient response of the LDO. The AP7168 is designed to have excellent transient response for most applications with a small amount of output capacitance. The AP7168 is stable for all available types and values of output capacitors ≥ 4.7μF. 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. This capacitor should be placed as close as possible to OUT and GND pins for optimum performance. The output voltage is calculated by: ⎛ R⎞ VOUT = VREF ⎜1 + 1 ⎟ ⎜ R2 ⎟ ⎠ ⎝ Where VREF=0.8V (the internal reference voltage) Rearranging the equation will give the following equation to find the approximate resistor divider values: ⎞ ⎛V R1 = R 2 ⎜ OUT − 1⎟ ⎟ ⎜V ⎠ ⎝ REF To maintain the stability of the internal reference voltage, R2 needs to be kept smaller than 250kΩ. Adjustable Operation The AP7168 provides output voltage from 0.8V to 5.0V through external resistor divider as shown below. AP7168 Document number: DS32019 Rev. 2 - 2 7 of 11 www.diodes.com September 2010 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Application Note (Continued) 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. Wide Output Range The AP7168, with a wide output range of 0.8V to 5.0V, provides a versatile solution for many portable and low power applications. ENABLE/SHUTDOWN Operation The AP7168 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. Thermal Shutdown Protection Thermal protection disables the output when the junction temperature rises to approximately +145°C, allowing the device to cool down. When the junction temperature reduces to approximately +120°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. N EW PRODUCT POWER-OK The Power-Ok (POK) pin is an active high open-drain output. It can be connected to any 5.5V or lower rail through an external pull-up resistor. The recommended sink current of POK pin is up to 4mA, so the pull-up resistor for POK should be in the range of 10kΩ to 1MΩ. If output voltage monitoring is not needed, the POK pin can be left floating. 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 ensuring reliable operation. Power dissipation of the device depends on input voltage and load conditions and can be calculated by: 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 1.6A (1.2A min) to prevent over-current and to protect the regulator from damage due to overheating. PD = ( VIN − VOUT )xIOUT The AP7168 is available in the SO-8EP packages, both with exposed pad, which is the primary conduction path for heat to the printed circuit board (PCB). The pad can be connected to ground or be left floating; however, to ensure the device will not overheat, it should be attached to an appropriate amount of copper PCB area. However, the maximum power dissipation that can be handled by the device depends on the maximum junction to ambient thermal resistance, maximum ambient temperature, and maximum device junction temperature, which can be approximated by the equation below: Short Circuit Protection When OUT pin is short-circuited to GND or OUT pin voltage is less than 200mV, short circuit protection will be triggered and clamp the output current to approximately 750mA. This feature protects the regulator from overcurrent and damage due to overheating. Low Quiescent Current The AP7168, consuming only around 150µA for all input range and output loading, provides great power saving in portable and low power applications. PD (max@ TA ) = ( +150°C − TA ) R θJA AP7168 Document number: DS32019 Rev. 2 - 2 8 of 11 www.diodes.com September 2010 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Ordering Information   AP716 8 - SP G - 13 Package SP : SO-8EP Green G : Green Packaging (Note 5) SO-8EP Packing 13 : Tape & Reel N EW PRODUCT Device AP7168-SPG-13 Notes: Package Code SP 13” Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 5. 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 SO-8EP ( Top View ) 8 5 Logo Part No. AP7168 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 AP7168 Document number: DS32019 Rev. 2 - 2 9 of 11 www.diodes.com September 2010 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Package Outline Dimensions Package Type: SO-8EP Detail "A" Exposed pad 7°~9° 3.85/3.95 5.90/6.10 3.70/4.10 45° 0.35max. N EW PRODUCT 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) Notes: 6. All dimensions are in millimeters. Angles are in degrees. 7. Coplanarity applies to the exposed heat sink slug as well as the terminals. 5.4 AP7168 Document number: DS32019 Rev. 2 - 2 10 of 11 www.diodes.com 2.4Ref. September 2010 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK 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 Incorporated convey any license under its patent or trademark rights, nor the rights of others. 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