NOT RECOMMENDED FOR NEW DESIGN CONTACT US PAM2301 800mA STEP-DOWN DC-DC CONVERTER Description Pin Assignments The PAM2301 is a step-down current-mode, DC-DC converter. At heavy load, the constant frequency PWM control performs excellent stability and transient response. To ensure the longest battery life in portable applications, the PAM2301 provides a power-saving Pulse- Skipping Modulation (PSM) mode to reduce quiescent current under light load operation to save power. The PAM2301 supports a range of input voltages from 2.5V to 5.5V, allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH cell, USB and other standard power sources. The output voltage is adjustable from 0.6V to the input voltage, while the part number suffix PAM2301-XX indicates pre-set output voltage of 3.3V, 1.2V or adjustable. All versions employ internal power switch and synchronous rectifier to minimize external part count and realize high TSOT25 efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 0.1mA. Other key features include under-voltage lockout to prevent deep battery discharge. The PAM2301 is available in TSOT25 package. Features Applications Cellular Phone Efficiency up to 96% Portable Electronics Only 40A (typical) Quiescent Current Wireless Devices Output Current: Up to 800mA Cordless Phone Internal Synchronous Rectifier Computer Peripherals 1.5MHz Switching Frequency Battery-Powered Widgets Soft Start Electronic Scales Under-Voltage Lockout Digital Frame Short Circuit Protection Thermal Shutdown TSOT25 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) & 2015/863/EU (RoHS 3) compliant. 2. See PAM2301 Typical Applications Circuit Fixed Output Voltage Adjustable Output Voltage R1 = 0.6 1+ V O R2 Pin Descriptions Pin Number Pin Name Function 1 EN Enable Control Input. Force this pin voltage above 1.5V, enables the chip, and below 0.3V shuts down the device. 2 GND Ground 3 SW The drains of the internal main and synchronous power MOSFET. 4 VIN Power Supply VOUT: Output voltage feedback pin, an internal resistive divider divides the output voltage down for comparison to the internal reference voltage. 5 VOUT/FB FB: Feedback voltage to internal error amplifier, the threshold voltage is 0.6V. Functional Block Diagram 2 of 13 February 2020 PAM2301 Diodes Incorporated www.diodes.com Document number: DS36384 Rev. 5 - 3