A Product Line of Diodes Incorporated PAM2320 3A LOW NOISE STEP-DOWN DC-DC CONVERTER Description Pin Assignments The PAM2320 is a 3A 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. The PAM2320 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 PAM2320 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 1A. Other key features include over-temperature and short circuit protection, and under-voltage lockout to prevent deep battery discharge. The PAM2320 delivers 3A maximum output current while consuming only 42A of no-load quiescent current. Ultra-low R integrated DS(ON) MOSFETs and 100% duty cycle operation make the PAM2320 an ideal choice for high output voltage, high current applications which Applications require a low dropout threshold. 5V or 3.3V Point of Load Conversion The PAM2320 is available in PSOP8 package. Telecom/Networking Equipment Set Top Boxes Storage Equipment Features Video Cards Output Current: Up to 3A DDR Power Supply Output Voltage: 0.6V to V IN Input Voltage: 2.7 to 5.5V Efficiency up to 95% 42A (typ) No Load Quiescent Current Shutdown Current: <1A 100% Duty Cycle Operation 1.5MHz Switching Frequency Internal Soft Start No external Compensation Required Current Limit Protection Thermal Shutdown PSOP-8 Package 1 of 12 October 2012 PAM2320 Diodes Incorporated www.diodes.com Document number: DSxxxxx Rev. 1 - 0 A Product Line of Diodes Incorporated PAM2320 Typical Applications Circuit R1 V O = 0.6 1 + R2 Pin Descriptions Pin PSOP-8 Function Number Pin Name 1 NC Not Connected. 2 VIN Bias supply. Chip main power supply pin. 3 SW The drains of the internal main and synchronous power MOSFET. 4 GND Ground Feedback voltage to internal error amplifier, the threshold voltage is 0.6V. 5 FB Not Connected. 6 NC Enable control input. Force this pin voltage above 1.5V, enables the chip, and below 0.3V shuts down 7 EN the device. 8 NC Not Connected. Functional Block Diagram 2 of 12 October 2012 PAM2320 Diodes Incorporated www.diodes.com Document number: DSxxxxx Rev. 1 - 0