AP3419 1.0MHZ, 2A STEP-DOWN DC-DC BUCK CONVERTER Description Pin Assignments NEW PRODUCT The AP3419 is a 2A step-down DC-DC converter. At heavy load, the constant frequency PWM control performs excellent stability and transient response. No external compensation components are required. (Top View) Pin 1 Mark The AP3419 supports a range of input voltages from 2.7V to 5.5V, allowing the use of a single Li+/Li- polymer cell, multiple Alkaline/NiMH cell, and other standard power sources. The output voltage is adjustable from 0.6V to the input voltage. The AP3419 employs internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 1μA. Other key features include over-temperature and short circuit protection, and under-voltage lockout to prevent deep battery discharge. EN 1 6 FB GND 2 5 NC LX 3 4 VIN TSOT26 Applications The AP3419 delivers 2A maximum output current while consuming only 90μA of no-load quiescent current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the AP3419 an ideal choice for high output voltage, high current applications which require a low dropout threshold. The AP3419 is available in TSOT26 package. 5V or 3.3V Point of Load Conversion Telecom/Networking Equipment Set Top Boxes Storage Equipment Video Cards DDR Power Supply Features Output Current: Up to 2A Output Voltage: 0.6V to VIN Input Voltage: 2.7V to 5.5V Peak Efficiency Up to 95% 90μA (Typ) No Load Quiescent Current Shutdown Current: <1μA 100% Duty Cycle Operation 1MHz Switching Frequency Internal Soft Start No External Compensation Required Current Limit Protection Thermal Shutdown TSOT26 package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. AP3419 Document number: DS36543 Rev. 3 - 2 1 of 9 www.diodes.com August 2015 © Diodes Incorporated AP3419 Typical Applications Circuit VIN=2.7V to 5.5V VIN NEW PRODUCT GND AP3419 CIN 22mF VOUT=1.8V LX C1 22pF R1 300k COUT 22mFx2 FB EN ON OFF L1 2.2mH R2 150k Pin Descriptions Pin Number Pin Name Function 1 EN Enable control input. Force this pin voltage above 1.5V enables the chip, and below 0.4V shuts down the device 2 GND 3 LX The drains of the internal main and synchronous power MOSFETs 4 VIN Bias supply. Chip main power supply pin 5 NC No connected 6 FB Feedback voltage to internal error amplifier. The threshold voltage is 0.6V AP3419 Document number: DS36543 Rev. 3 - 2 Ground pin 2 of 9 www.diodes.com August 2015 © Diodes Incorporated AP3419 Functional Block Diagram 4 NEW PRODUCT ____ OSC FREQ SHIFT S Q R _ Q _ VIN 1 EN EA PWM + COMP _ 6 FB VIN + IAMP SWITCHING LOGIC AND BLOCKING CIRCUIT _ + SLOPE COMP + 1M OSC 3 ANTISHOOT THRU LX 0.6V REF 2 SHUTDOWN GND Absolute Maximum Ratings (Note 4) Symbol Parameter Rating Unit -0.3 to 6 V VIN Input Voltage VEN EN Pin Voltage -0.3 to VIN+0.3 V VLX LX Pin Voltage -0.3 to VIN+0.3 V VFB Feedback Pin Voltage -0.3 to VIN+0.3 V θJA Thermal Resistance (Junction to Ambient) 220 °C/W TJ Operating Junction Temperature +150 °C -65 to +150 °C TSTG Storage Temperature TLEAD Lead Temperature (Soldering, 5 sec) +300 °C VMM ESD (Machine Model) 200 V VHBM ESD (Human Body Model) 2000 V Note 4: Stresses greater than 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 under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. AP3419 Document number: DS36543 Rev. 3 - 2 3 of 9 www.diodes.com August 2015 © Diodes Incorporated AP3419 Recommended Operating Conditions NEW PRODUCT Symbol Parameter Min Max Unit VIN Input Voltage Range 2.7 5.5 V TA Operating Ambient Temperature -40 +85 °C TJ Junction Temperature Range -40 +125 °C Electrical Characteristics (@VIN = 5V, VOUT = 1.8V, L = 2.2µH, COUT = 22µFx2, TA = +25°C, unless otherwise specified.) Symbol Parameters Conditions Min Typ Max Unit Input Voltage Range – 2.7 – 5.5 V Output Voltage Range – 0.6 – VIN V VFB Regulated Feedback Voltage – 0.588 0.6 0.612 V IFB FB Leakage Current VFB = 1V – – 0.2 μA IQ Quiescent Current VFB = 0.65V – 90 – μA ISD Shutdown Current VEN = 0V – – 1 μA ILIM Peak Inductor Current – 3 – – A fOSC Oscillator Frequency – – 1 – MHz Drain to Source On-state Resistance ILX = 100mA, high side – 110 – ILX = 100mA, low side – 80 – VENH EN High Threshold – 1.5 – – V VENL EN Low Threshold – – – 0.4 V EN Leakage Current VIN = VEN = 5V -1.0 – 1.0 μA VUVLO Input UVLO Threshold – – 2.4 2.7 V VHYS UVLO Hysteresis – – 0.2 – V TOTP Over Temperature Protection – – +160 – °C TOTH OTP Hysteresis – – +30 – °C VIOVP VIN Over Voltage Protection — — 6.25 — V VIHSY IOVP Hysteresis — — 0.25 — V Soft-start Time – – 1.8 – ms VIN VOUT RDS(ON) IEN tSS AP3419 Document number: DS36543 Rev. 3 - 2 mΩ 4 of 9 www.diodes.com August 2015 © Diodes Incorporated AP3419 Performance Characteristics (@TA = +25°C, VIN = 5V, VOUT = 1.8V, unless otherwise specified.) Efficiency vs. Load Current Feedback Reference Voltage vs. Temperature 0.620 90 0.615 Feedbaxk Reference Voltage (V) 100 80 Efficiency (%) 60 50 40 30 VIN=5V, VOUT=1.0V VIN=5V, VOUT=1.8V VIN=5V, VOUT=3.3V 20 10 1 10 100 0.610 0.605 0.600 0.595 0.590 0.585 0.580 -60 0 1000 -40 -20 0 20 40 60 80 100 120 140 o Temperature ( C) IOUT (mA) PFET Drain-Source On-State Resistance vs. Temperature NFET Drain-Source On-State Resistance vs. Temperature 120 200 190 110 170 NFET RDS(ON) (m) PFET RDS(ON) (m) 180 160 150 140 130 100 90 80 70 120 60 110 100 -60 -40 -20 0 20 40 60 80 100 120 50 -60 140 -40 -20 0 40 60 80 100 120 140 o Temperture ( C) Inductor Current Limit vs. Temperature Oscillation Frequency vs. Temperature 1.20 4.4 1.15 4.2 1.10 Oscilliator Frequecny (MHz) 4.6 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 -60 20 Temperture ( C) o Inductor Current Limit (A) NEW PRODUCT 70 1.05 1.00 0.95 0.90 0.85 0.80 0.75 -40 -20 0 20 40 60 80 100 120 140 o Document number: DS36543 Rev. 3 - 2 -40 -20 0 20 40 60 80 100 120 140 o Temperature ( C) AP3419 0.70 -60 Temperature ( C) 5 of 9 www.diodes.com August 2015 © Diodes Incorporated AP3419 Performance Characteristics (Cont. @TA = +25°C, VIN = 5V, VOUT = 1.8V, unless otherwise specified.) Enable Turn on Characteristic (IOUT=2A) Enable Turn off Characteristic (IOUT=2A) VEN (2V/div) NEW PRODUCT VEN (2V/div) VOUT (1V/div) VOUT (1V/div) IL (2A/div) IL (2A/div) VSW (5V/div) VSW (5V/div) Time (5ms/div) Time (5ms/div) Short Current Protection (IOUT=2A) VOUT (1V/div) SCP Recovery (IOUT=2A) VOUT (1V/div) IL (2A/div) IL (2A/div) VSW (5V/div) VSW (5V/div) Time (50ms/div) Time (50ms/div) Load Transient (IOUT=0.1A to 2A) Load Transient (IOUT=1A to 2A) VOUT_AC (100mV/div) VOUT_AC (100mV/div) IOUT (1A/div) IOUT (1A/div) Time (100µs/div) AP3419 Document number: DS36543 Rev. 3 - 2 Time (100µs/div) 6 of 9 www.diodes.com August 2015 © Diodes Incorporated AP3419 Application Information Typical application circuit is shown in the application circuit and for the circuit parameters setting please refers to the following descriptions. Under Voltage Lockout (UVLO) Circuit When the VIN drops lower than the UVLO detector threshold, the UVLO circuit starts to operate, V REF stops, and high-side switch and low-side switch built-in switch transistors turn “OFF”. As a result, V OUT drops according to the COUT capacitance value and the load. When the VIN is rising higher than UVLO released voltage, the IC will restart the operation. NEW PRODUCT Short Circuit Protection and Recovery When the AP3419 output node is shorted to GND that VFB drops under 0.3V, AP3419 will enter hiccup mode to protect itself. If short circuit is removed, and VFB rises over 0.3V, the AP3419 recovers to normal operation again. If the AP3419 reaches OCP threshold while short circuit, the AP3419 will enter cycle by cycle current limit mode until the current under OCP threshold. Over Temperature Protection The internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. When the junction temperature exceeds +160°C, it shuts down the internal control circuit and switching power MOSFET. The AP3419 will restart automatically under the control of soft start circuit when the junction temperature decreases to +130°C. Input Over Voltage Protection When input voltage of AP3419 is near 6.25V, the IC will enter Input-Over-Voltage-Protection. It would be shut down and there will be no output voltage in this state. As the input voltage goes down below 6V, it will leave input OVP and recover the output voltage. Ordering Information AP3419 XX XX - XX Package Packing RoHS/Green KT : TSOT26 TR: Tape & Reel G1 : Green Product Name Package Temperature Range TSOT26 -40 to +85°C Part Number AP3419KTTR-G1 Marking ID L8J Packing 3000/Tape & Reel Marking Information (Top View) First Line: Logo and Marking ID AP3419 Document number: DS36543 Rev. 3 - 2 7 of 9 www.diodes.com August 2015 © Diodes Incorporated AP3419 Package Outline Dimensions Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version. (1) Package Type: TSOT26 TSOT26 Dim Min Max Typ A 1.00 A1 0.01 0.10 A2 0.84 0.90 D 2.90 E 2.80 E1 1.60 b 0.30 0.45 c 0.12 0.20 e 0.95 e1 1.90 L 0.30 0.50 L2 0.25 θ 0° 8° 4° θ1 4° 12° All Dimensions in mm D NEW PRODUCT e1 E E1 L2 c 4x1 e L 6x b A A2 A1 Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) Package Type: TSOT26 C C Dimensions Value (in mm) C 0.950 X 0.700 Y 1.000 Y1 3.199 Y1 Y (6x) X (6x) AP3419 Document number: DS36543 Rev. 3 - 2 8 of 9 www.diodes.com August 2015 © Diodes Incorporated AP3419 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. 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. 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. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated. 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 © 2015, Diodes Incorporated www.diodes.com AP3419 Document number: DS36543 Rev. 3 - 2 9 of 9 www.diodes.com August 2015 © Diodes Incorporated