PAM2319AYAA Diodes Incorporated

A Product Line of Diodes Incorporated PAM2319 DUAL HIGH-EFFICIENCY PWM STEP-DOWN DC-DC CONVERTER Description Pin Assignments The PAM2319 is a dual step-down current-mode, DC-DC converter. At heavy load, the constantf requency PWM control performs excellent stability and transient response. To ensure the longest battery life in portable applications, the PAM2319 provides a power- saving Pulse-Skipping Modulation (PSM) mode to reduce quiescent current under light load operation. The PAM2319 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, USB, and other standard power sources. The dual output voltages are adjustable from 1.0V to 3.3V. Both channels 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, soft-start, short circuit protection and thermal shutdown. Features Applications Supply Voltage: 2.7V to 5.5V Portable Electronics Output Voltage: Personal Information Appliances Vo1 ADJ/1000mA Wireless and DSL Modems Vo2 ADJ/2000mA Low Quiescent Current: Channel 1: 40A Channel 2: 55A High Efficiency: Switching Frequency: 3MHz(Channel 1) 2.5MHz(Channel 2) Internal Synchronous Rectifier Soft Start Under-Voltage Lockout Short Circuit Protection Thermal Shutdown Small W-DFN3X3-12L Pb-Free/Halogen Free Package RoHS/REACH Compliant 1 of 12 November 2012 PAM2319 Diodes Incorporated www.diodes.com Document number: DSxxxxx Rev. 1 - 1 A Product Line of Diodes Incorporated PAM2319 Typical Applications Circuit Figure 1. Adjustable Voltage Regulator Pin Descriptions Pin W-DFN3x3-12L Function Number Pin Name 1 FB2 Channel 2 feedback pin internally set to 0.6V. 2 VIN2 Input voltage pin of channel 2. 3 AGND2 Signal ground of channel 2 for small signal components. 4 VIN1 Input voltage pin of channel 1. 5 PGND1 Main power ground pin of channel 1 6 SW1 Channel 1 switching pin. The drains of the internal main and synchronous power MOSFET. 7 FB1 Channel 1 feedback pin internally set to 0.6V. 8 AGND1 Signal ground of channel 1 for small signal components. 9 EN1 Enable control input. Pull logic high to enable Vo1. Pull logic low to disable. 10 EN2 Enable control input. Pull logic high to enable Vo2. Pull logic low to disable. 11 PGND2 Main power ground pin of channel 2. 12 SW2 Channel 2 switching pin. The drains of the internal main and synchronous power MOSFET. Exposed Pad Connect to GND 2 of 12 November 2012 PAM2319 Diodes Incorporated www.diodes.com Document number: DSxxxxx Rev. 1 - 1