NOT RECOMMENDED FOR NEW DESIGN CONTACT US AP3419 1.0MHZ, 2A STEP-DOWN DC-DC BUCK CONVERTER Description Pin Assignments The AP3419 is a 2A step-down DC-DC converter. At heavy load, the constant frequency PWM control performs excellent stability and (Top View) transient response. No external compensation components are Pin 1 Mark Pin 1 Mark required. 6 1 The AP3419 supports a range of input voltages from 2.7V to 5.5V, 2 5 1 6 FB EN allowing the use of a single Li+/Li- polymer cell, multiple 3 4 Alkaline/NiMH cell, and other standard power sources. The output GND 5 2 NC voltage is adjustable from 0.6V to the input voltage. The AP3419 employs internal power switch and synchronous rectifier to minimize LX 3 4 VIN external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less TSOT26 than 1A. Other key features include over-temperature and short circuit protection, and under-voltage lockout to prevent deep battery discharge. Applications 5V or 3.3V Point of Load Conversion The AP3419 delivers 2A maximum output current while consuming Telecom/Networking Equipment only 90A of no-load quiescent current. Ultra-low R integrated DS(ON) Set Top Boxes MOSFETs and 100% duty cycle operation make the AP3419 an ideal Storage Equipment choice for high output voltage, high current applications which require Video Cards a low dropout threshold. DDR Power Supply The AP3419 is available in TSOT26 package. Features Output Current: Up to 2A Output Voltage: 0.6V to V IN Input Voltage: 2.7V to 5.5V Peak Efficiency Up to 95% 90A (Typ) No Load Quiescent Current Shutdown Current: <1A 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) For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. AP3419 AP3419 Typical Applications Circuit V =2.7V to 5.5V IN VIN C IN L1 2.2H 22F V =1.8V OUT LX R1 C1 C OUT GND 22pF 300k 22 Fx2 FB EN ON OFF R2 150k Pin Descriptions Pin Number Pin Name Function Enable control input. Force this pin voltage above 1.5V enables the chip, and 1 EN below 0.4V shuts down the device 2 GND Ground pin 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 2 of 9 February 2020 AP3419 Diodes Incorporated www.diodes.com Document number: DS36543 Rev. 5 - 3