NOT RECOMMENDED FOR NEW DESIGN CONTACT US PAM2303 3A LOW NOISE STEP-DOWN DC-DC CONVERTER Description Pin Assignments The PAM2303 is a 3A step-down DC-DC converter. It operates in two different modes: PSM and PWM modes. At light load, it automatically enters into the PSM mode to improve efficiency. At heavy load, the constant frequency PWM control performs excellent stability and transient response. No external compensation components are required. The PAM2303 supports a range of input voltages from 2.7V to 5.5V. The output voltage is adjustable from 0.6V to the input voltage. The PAM2303 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 PAM2303 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 PAM2303 an ideal choice for high-output voltage, high-current applications which require a low dropout threshold. The PAM2303 is available in SOP-8(EP), DFN3X3-10 and QFN3X3- 16 package. Features Output Current: Up to 3A 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 Applications Analog Soft Start No external Compensation Required 5V or 3.3V Point of Load Conversion Current Limit Protection Telecom/Networking Equipment Thermal Shutdown Set Top Boxes SOP-8(EP), DFN3X3-10 and QFN3X3-16 Package Storage Equipment Video Cards DDR Power Supply 1 of 14 February 2020 PAM2303 Diodes Incorporated www.diodes.com Document number: DS36385 Rev. 3 - 3 PAM2303 Typical Applications Circuit R1 = 0.6 1 + V O R2 Pin Descriptions Package Name Pin Function Name QFN3x3-16 SOP-8EP DFN3x3-10 PGND 1, 2, 3 2 Main power ground pin. FB 4 3 6 Feedback voltage to internal error amplifier, the threshold voltage is 0.6V. GND 5 4 4 Signal ground for small signal components. NC 6, 16 7 Not connected. Enable control input. Force this pin voltage above 1.5V, enables the chip, and below EN 7 5 5 0.3V shuts down the device. Test 8 6 Test mode. Lowconnection is recommended. VIN 9 7 8, 9, 10 Bias supply. Chip main power supply pin. PVIN 10, 11, 12 8 Input supply for power stage. Must be closely decoupled to PGND. SW 13, 14, 15 1 1, 2, 3 The drains of the internalmain and synchronous power MOSFET. 2 of 14 February 2020 PAM2303 Diodes Incorporated www.diodes.com Document number: DS36385 Rev. 3 - 3