A Product Line of Diodes Incorporated PAM2306 DUAL HIGH-EFFICIENCY PWM STEP-DOWN DC-DC CONVERTER Description Pin Assignments The PAM2306 is a dual step-down current-mode, DC-DC converter. At heavy load, the constant frequency PWM control provides excellent stability and transient response. To ensure the longest battery life in portable applications, the PAM2306 provides a power - saving Pulse-Skipping Modulation (PSM) mode to reduce quiescent current under light load operation. The PAM2306 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 dual output voltages are available for 3.3V, 2.8V, 2.5V, 1.8V, 1.5V, 1.2V or adjustable. 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. Applications Features Cellular Phone Efficiency up to 96% Portable Electronics Only 40A (typ per channel) Quiescent Current Personal Information Appliances Output Current: Up to 1A per Channel Wireless and DSL Modems Internal Synchronous Rectifier MP3 Players 1.5MHz Switching Frequency Soft Start Under-Voltage Lockout Short Circuit Protection Thermal Shutdown Small 12L WDFN3x3 Package Pb-Free Package and RoHS Compliant Typical Applications Circuit Rx1 V V OUT REF 1 Rx2 Figure 1. Adjustable Voltage Regulator 1 of 15 November 2012 PAM2306 Diodes Incorporated www.diodes.com Document number: DS36392 Rev. 1 - 2 A Product Line of Diodes Incorporated PAM2306 Typical Applications Circuit V = 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.3V OUT Figure 2. Fixed Voltage Regulator Pin Descriptions Pin Name Pin Number Function WDFN3x3-12L 1 VIN2 Power Input of Channel 2. 2 LX2 Pin for Switching of Channel 2. 3, 9 Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum GND power dissipation. Exposed Pad 4 FB1 Feedback of Channel 1. 5, 11 NC1, NC2 No Connection 6 EN1 Chip Enable of Channel 1 (Active High). V V . EN1 IN1 7 VIN1 Power Input of Channel 1. 8 LX1 Pin for Switching of Channel 1. 10 FB2 Feedback of Channel 2. 12 EN2 Chip Enable of Channel 2 (Active High). V V . EN2 IN2 2 of 15 November 2012 PAM2306 Diodes Incorporated www.diodes.com Document number: DS36392 Rev. 1 - 2