Diodes PAM2308 - Manual

PAM2308
Document number: DSxxxxx Rev. 1 - 1
1 of 15
www.diodes.com
January 2013
© Diodes Incorporated
PAM2308
A Product Line of
Diodes Incorporated
DUAL HIGH-EFFICIENCY PWM STEP-DOWN DC-DC CONVERTER
Description
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 0.1µA. Other key features
include under-voltage lockout to prevent deep battery discharge.
Features
• Efficiency up to 96%
• Only 40μA (typ per channel) Quiescent Current
• Output Current: Up to 1A per Channel
• Internal Synchronous Rectifier
• 1.5MHz Switching Frequency
• Soft-Start
• Under-Voltage
Lockout
• Short Circuit Protection
• Thermal Shutdown
• Small WDFN3x3-10L Packages
• Pb-Free Package and RoHS Compliant
Pin Assignments
Applications
• Cellular Phone
• Portable Electronics
• Personal Information Appliances
• Wireless and DSL Modems
• MP3 Players
Typical Applications Circuit
⎟
⎠
⎞
⎜
⎝
⎛ +
=
2 Rx
1 Rx
1 V V
REF OUTx
Figure 1. Adjustable Voltage Regulator