BKA BKAYW YW NOT RECOMMENDED FOR NEW DESIGN CONTACT US PAM2305D 1A STEP-DOWN DC-DC CONVERTER Description Pin Assignments The PAM2305D is a step-down current-mode, DC-DC converter. At heavy load, the constant frequency PWM control per forms excellent stability and transient response. To ensure the longest battery life in Top View portable applications, the PAM2305D provides a power-saving Pulse- TSOT25 Skipping Modulation (PSM) mode to reduce quiescent current under light load operation to save power. The PAM2305D 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. All versions employ 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 0.1A. Other key features include under-voltage lockout to prevent deep battery discharge. The PAM2305D is available in TSOT25, DFN2x2-6 pin and QFN3x3- 16 pin packages. Features Efficiency up to 96% Only 40A (Typ) Quiescent Current Output Current: Up to 1A Internal Synchronous Rectifier 1.5MHz Switching Frequency Soft Start Under-Voltage Lockout Short Circuit Protection Thermal Shutdown 5-Pin Small TSOT25, DFN2x2-6 Pin and QFN3x3-16 Pin Packages Pb-Free Packages Applications Cellular Phone Portable Electronics Wireless Devices Cordless Phone Computer Peripherals Battery Powered Widgets Electronic Scales Digital Frame 1 of 15 February 2020 PAM2305D Diodes Incorporated www.diodes.com Document number: DS36396 Rev. 5 - 3 PAM2305D Typical Applications Circuit R1 = 0.6 1 + V O R2 Pin Descriptions Pin Package Name Function Name TSOT25 DFN2x2-6L QFN3x3-16L VIN 1 3 9, 10, 11, 12 Chip main power supply pin. GND 2 5 1, 2, 3, 5 Ground. Enable Control Input. Force this pin voltage above 1.5V, enables the chip, and EN 3 2 7 below 0.3V shuts down the device. FB 4 6 4 Feedback voltage to internal error amplifier, the threshold voltage is 0.6V. SW 5 4 13, 14, 15 The drains of the internal main and synchronous power MOSFET. NC 1 6, 8, 16 No connection. Functional Block Diagram 2 of 15 February 2020 PAM2305D Diodes Incorporated www.diodes.com Document number: DS36396 Rev. 5 - 3