PAM2308BYMAA Diodes Incorporated

A Product Line of Diodes Incorporated PAM2308 DUAL HIGH-EFFICIENCY PWM STEP-DOWN DC-DC CONVERTER Description Pin Assignments The PAM2308 is a dual step-down current-mode, DC-DC converter. At heavy load, the constant frequency PWM control performs excellent stability and transient response. To ensure the longest battery life in portable applications, the PAM2308 provides a power- saving Pulse- Skipping Modulation (PSM) mode to reduce quiescent current under light load operation. The PAM2308 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. Features Efficiency up to 96% Only 40A (typ per channel) Quiescent Current Applications Output Current: Up to 1A per Channel Cellular Phone Internal Synchronous Rectifier Portable Electronics 1.5MHz Switching Frequency Personal Information Appliances Soft-Start Wireless and DSL Modems Under-Voltage Lockout MP3 Players Short Circuit Protection Thermal Shutdown Small WDFN3x3-10L Packages Pb-Free Package and RoHS Compliant Typical Applications Circuit Rx1 = 1 + Figure 1. Adjustable Voltage Regulator V V OUTx REF Rx2 1 of 15 January 2013 PAM2308 Diodes Incorporated www.diodes.com Document number: DSxxxxx Rev. 1 - 1 A Product Line of Diodes Incorporated PAM2308 Typical Applications Circuit (cont.) V = 1.2V, 1.5V, 1.8V, 2.5V, 2.8V or 3.3V OUTx Figure 2. Fixed Voltage Regulator Pin Descriptions Pin Pin Function Name Number EN1 1 Chip Enable of Channel 1(Active High). V V . EN1 IN1 FB1 2 Feedback of Channel 1. VIN2 3 Power Input of Channel 2. Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power GND 4, 9 dissipation. LX2 5 Pin for Switching of Channel 2. EN2 6 Chip Enable of Channel 2 (Active High).V V . EN2 IN2 Feedback of Channel 2. FB2 7 Power Input of Channel 1. VIN1 8 LX1 10 Pin for Switching of Channel 1. 2 of 15 January 2013 PAM2308 Diodes Incorporated www.diodes.com Document number: DSxxxxx Rev. 1 - 1