AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Description 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 SOP-8L-EP: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) 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 SOP-8L-EP package. 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 Typical Application Circuit VIN VOUT IN OUT 100kOhm R1 AP7168 1µF 10µF FB POK R2 Enable EN GND ⎛ R ⎞ VOUT = VREF ⎜⎜1 + 1 ⎟⎟ ⎝ R2 ⎠ AP7168 Rev. 1 1 of 11 www.diodes.com NOVEMBER 2009 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Ordering Information AP7168 - SP G - 13 Device Green Packing SP : SOP-8L-EP G : Green 13 : Tape & Reel Package Code SP AP7168-SPG-13 Notes: Package Packaging (Note 2) SOP-8L-EP 13” Tape and Reel Quantity Part Number Suffix 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 (1) SOP-8L-EP ( Top View ) IN 1 8 OUT POK 2 7 FB NC 3 6 NC EN 4 5 GND Pin Descriptions Name Pin Number IN 1 POK EN GND FB 2 4 5 7 OUT 8 NC 3, 6 AP7168 Rev. 1 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. 2 of 11 www.diodes.com NOVEMBER 2009 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Functional Block Diagram OUT IN Current Limit and Thermal Shutdown Gate Driver EN FB 0.8V POK 0.744V GND Absolute Maximum Ratings Symbol Parameter ESD HBM Human Body Model ESD Protection ESD MM Machine Model ESD Protection VIN Input Voltage OUT, FB, POK, EN Voltage Continuous Load Current Notes: Ratings Unit 4 300 KV 7 V VIN + 0.3 V V Internal Limited TJ Operating Junction Temperature Range -40 ~ 150 °C TST Storage Temperature Range -65 ~150 °C PD Power Dissipation 1.9 W SOP-8L-EP (Note 3, 5) 3. Ratings apply to ambient temperature at 25°C Recommended Operating Conditions Symbol VIN IOUT TA AP7168 Rev. 1 Parameter Input voltage Output Current Operating Ambient Temperature 3 of 11 www.diodes.com Min 2.2 0 -40 Max 5.5 1.2 85 Unit V A °C NOVEMBER 2009 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Electrical Characteristics o (TA = 25 C, VIN = VOUT +1V, CIN = 1µF, COUT = 10µF, VEN = VIN, unless otherwise stated) Symbol IQ ISHDN VDropout VREF IFB VOUT Parameter Input Quiescent Current Input Shutdown Current Test Conditions IOUT= 0 VEN = 0V, IOUT = 0 (Note 4) VOUT ≥ 1.5V, IOUT = 0.5A VOUT ≥ 1.5V, IOUT = 1A Dropout Voltage FB reference voltage FB leakage Output Voltage Total Accuracy ΔVOUT / VOUT Line Regulation ΔVIN ΔVOUT / VOUT tST Load Regulation Start-up Time, from EN high to POK high Power Supply Rejection Ratio ILIMIT ISHORT VIL VIH IEN VOL Current limit Short-circuit Current EN Input Logic Low Voltage EN Input Logic High Voltage EN Input leakage POK output low voltage Output voltage (rising) POK threshold Output voltage POK hysteresis VPOK_Hys POK deglitch POK leakage current IPOK_LK Thermal shutdown threshold TSHDN Thermal shutdown hysteresis THYS Thermal Resistance θJA Junction-to-Ambient Notes: ⎯ -3 VIN = VOUT +1V to 5.5V, IOUT = 1mA PSRR VPOK_TH_UP Min ⎯ -1 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 Typ. 125 0.1 230 500 0.8 0.01 Max 180 1 800 1 3 0.02 -1.5 1.2 Unit µA µA mV mV V µA % %/V 1.5 % 190 µs 60 dB 1.6 750 0.01 100 1 200 A mA V V µA mV 87% 92% 97% Vref ⎯ 4% 160 0.01 145 25 1 Vref µs µA °C °C 0.4 VEN = 0V or 5.5V Force 2mA FB (or OUT for fixed version) rising VIN = 3.3V, VOUT = 1.2V VPOK = 5.5V SOP-8L-EP (Note 5) 1.4 ⎯ 74 o C/W 4. POK pin must be disconnected from IN pin. 5. Test condition for SOP-8L-EP: Device mounted on 2oz copper, minimum recommended pad layout on top & bottom layer with thermal vias, double sided FR-4 PCB. AP7168 Rev. 1 4 of 11 www.diodes.com NOVEMBER 2009 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Typical Performance Characteristics Output Voltage vs. Temperature Output Voltage vs. Tem perature 3.40 1.30 VOUT = 1.2V Output Voltage (V) Output Voltage (V) VOUT = 3.3V 3.35 3.30 3.25 1.25 1.20 1.15 1.10 3.20 -50 -25 0 25 50 75 100 -50 125 -25 0 Temperature ( C) Quiescent Current vs. Input Voltage 140 125 110 95 Iout=0mA Iout=500mA Quiescent Current ( μ A) Quiescent Current (μA) 155 80 75 100 125 VOUT=1.8V 170 160 150 140 130 120 110 VIN=2.5V VIN=3.3V 100 4.0 4.3 4.6 4.9 5.2 5.5 0.0 0.2 0.4 0.6 Input Voltage (V) 0.8 1.0 1.2 IOUT (A) Reference Voltage vs. Temperature Quiescent Current vs. Tem perature 0.810 155 140 125 110 VIN=2.2V, Vout=1.0V 95 VIN=3.3V, Vout=1.8V Reference Voltage (V) 170 Quiescent Current ( π A) 50 Quiescent Current vs. IOUT VOUT=3.3V 170 25 Tem perature (0C) 0 0.805 0.800 0.795 Vin=2.2V Vin=3.3V Vin=5.5V VIN=5.0V, Vout=3.3V 0.790 80 -50.0 -25.0 0.0 25.0 50.0 75.0 100.0 125.0 Tem perature ( C) AP7168 Rev. 1 -50 -25 0 25 50 75 100 125 Temperature (0C) 0 5 of 11 www.diodes.com NOVEMBER 2009 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Typical Performance Characteristics (Continued) Line Regulation Load Regulation VOUT=1.8V, IOUT=1mA VIN=2.2V, VOUT=1.2V, 0.10 0.5 Change in V OUT (%) Change in V OUT (%/V) 25°C 0.05 0.00 -0.05 25°C 85°C 0.4 85°C 0.3 -40°C 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -40°C -0.10 -0.5 3.0 3.5 4.0 4.5 5.0 0.0 5.5 0.4 0.8 V IN (V) Short Circuit Current vs. Temperature Short Circuit Current vs. Input Voltage VOUT=1.2V VOUT=1.2V 0.80 Short Circuit Current (A) Short Circuit Current (A) 0.77 1.2 IOUT (A) 0.76 0.75 0.74 0.73 0.72 0.71 0.70 0.75 0.70 0.65 0.69 2.2 2.4 2.6 2.8 3 3.2 0.60 3.4 -50 Input Voltage (V) -25 0 25 50 75 o Temperature ( C) Dropout Voltage vs. IOUT PSRR -40 600 -45 -50 500 PS RR (dB) Dropout Voltage (mV) VOUT=3.3V 700 400 300 -55 -60 -65 -70 200 25°C 100 -75 85°C -40°C 0 0 0.2 0.4 0.6 0.8 1 1.2 IOUT(A) AP7168 Rev. 1 6 of 11 www.diodes.com -80 100 1000 10000 Frequency (Hz) 100000 NOVEMBER 2009 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Typical Performance Characteristics (Continued) Line Transient Response Line Transient Response VIN =3V to 5.5V VIN =5.5V to 3V COUT =10uF (Ceramic) COUT =10uF (Ceramic) VIN 2V/div VIN 2V/div VOUT 50mV/div VOUT 50mV/div Time (500us/div) Time (5ms/div) Output Load Transient Response (VOUT=1.8V) Output Load Transient Response (VOUT=3.3V) COUT=470uF (electrolytic) VOUT COUT=10uF (Ceramic) 100mV/div COUT=470uF (electrolytic) VOUT COUT=10uF (Ceramic) 100mV/div COUT=1uF (Ceramic) COUT=1uF (Ceramic) 1.2A IOU 1.2A 1A/us 500mA/div IOU 1A/us 500mA/div 50mA 50mA Time (100us/div) Time (100us/div) Start-up Time (VOUT=1.2V, IOUT=0.1A) Start-up Time (VOUT=1.2V, IOUT=1.2A) VEN 2V/div VEN 2V/div COUT=10uF COUT=10uF VOUT 1V/div VOUT 1V/div VPOK 2V/div VPOK 2V/div Time (50us/div) AP7168 Rev. 1 Time (50us/div) 7 of 11 www.diodes.com NOVEMBER 2009 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Typical Performance Characteristics (Continued) Current Limit vs. Temperature Current Limit (A) 1.8 1.7 1.6 1.5 VIN =2.8V,Vout=1.8V VIN =3.3V,Vout=1.8V 1.4 -50 -25 0 25 50 75 100 Temperature (oC) Application Note VIN 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. 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. Adjustable Operation The AP7168 provides output voltage from 0.8V to 5.0V through external resistor divider as shown below. AP7168 Rev. 1 VOUT IN CIN OUT 100kOhm R1 AP7168 POK COUT FB R2 Enable EN GND 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⎟⎟ ⎝ VREF ⎠ To maintain the stability of the internal reference voltage, R2 needs to be kept smaller than 250kΩ. 8 of 11 www.diodes.com NOVEMBER 2009 © 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. 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. 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. Short Circuit Protection When OUT pin is short-circuited to GND or OUT voltage is less than 200mV, short circuit protection be triggered and clamp the output current approximately 750mA. This feature protects regulator from over-current and damage due overheating. pin will to the to 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: PD = ( VIN − VOUT )xIOUT The AP7168 is available in the SOP-8L-EP 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: 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. AP7168 Rev. 0.1 9 of 11 www.diodes.com PD (max@ TA ) = ( +150°C − TA ) R θJA NOVEMBER 2009 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK Marking Information (1) SOP-8L-EP ( Top View ) 5 8 G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code SOP-8L-EP Logo AP7168 YY WW X X E Part No. 1 Package Information 4 (All Dimensions in mm) (1) Package Type: SOP-8L-EP Detail "A" Exposed pad 2.4Ref. 3.70/4.10 45° 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: 6. All dimensions are in millimeters. Angles are in degrees. 7. Coplanarity applies to the exposed heat sink slug as well as the terminals. AP7168 Rev. 1 10 of 11 www.diodes.com NOVEMBER 2009 © Diodes Incorporated AP7168 1.2A LOW DROPOUT REGULATOR WITH POK 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. 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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