Diodes PAM2312 - Manual

PAM2312
Document number: DSxxxxx Rev. 2 - 0
1 of 14
www.diodes.com
January 2013
© Diodes Incorporated
PAM2312
A Product Line of
Diodes Incorporated
1A STEP-DOWN DC-DC CONVERTER
Description
The PAM2312 is a 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 PAM2312 provides a power-saving
Pulse- Skipping Modulation (PSM) mode to reduce quiescent current
under light load operation to save power.
The PAM2312 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 output voltage is
adjustable from 0.6V to the input voltage, while the part number suffix
PAM2312-XX indicates pre-set output voltage of 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 1µA. Other key
features include under-voltage lockout to prevent deep battery
discharge.
The PAM2312 is available in TSOT25 packages.
Features
• Efficiency up to 96%
• Only 40µA (typ) Quiescent Current
• Output Current: Up to 1A
• Internal Synchronous Rectifier
• 1.5MHz Switching Frequency
• Soft Start
• Under-Voltage Lockout
• Short Circuit Protection
• Thermal Shutdown
• 5-pin Small TSOT25 Packages
• Pb-Free Package
Pin Assignments
Applications
• Cellular Phone
• Portable Electronics
• Wireless Devices
• Cordless Phone
• Computer Peripherals
• Battery Powered Widgets
• Electronic Scales
• Digital Frame
Typical Applications Circuit
Fixed Output Voltage Adjustable Output Voltage
⎟
⎠
⎞
⎜
⎝
⎛ +
=
2 R
1 R
1 x 6 . 0 V
O
Top View
TSOT25