Diodes PAM2321 - Manual

PAM2321
Document number: DSxxxxx Rev. 2 - 1
1 of 11
www.diodes.com
January 2013
© Diodes Incorporated
PAM2321
A Product Line of
Diodes Incorporated
3MHz, FAST TRANSIENT 2A STEP-DOWN CONVERTER
Description
The PAM2321 is a 2A step-down converter with a typical input
voltage of 3.3V and a fixed output voltage of 1.2V or an adjustable
output. The 3MHz switching frequency enables the use of small
external components. The ultra-small 3mmx3mm footprint and high
efficiency make the PAM2321 an ideal choice for portable
applications.
The PAM2321 delivers 2A maximum output current while consuming
only 55µA no-load quiescent current. Low R
DS(ON)
integrated
MOSFETs and 100% duty cycle operation make the PAM2321 the
ideal choice for high output voltage, high current applications which
require a low dropout threshold.
The PAM2321 provides excellent transient response and output
accuracy across the operating range.
The PAM2321 maintains high efficiency throughout the load range.
The PAM2321 automatically optimizes efficiency during light load
mode (PSM) and maintains constant frequency and low output ripple
during PWM mode.
Over-temperature and short circuit protection safeguard the PAM2321
and system components from damage.
The PAM2321 are available in Pb-free, ultrasmall, low profile,
TDFN3X3-10 package. The product is rated over a temperature range
of -40°C to +85°C.
Features
• 2A Maximum Output Current
• Tiny 0.47µH Chip Inductor
• Excellent Transient Response
• Input Voltage: 2.7V to 5.5V
• Fixed or Adjustable Output Voltage Options:
ƒ
Fixed Output Voltage: 1.2V
ƒ Adjustable Output Voltage: 1.0V to V
IN
• High Efficiency with 3MHz Switching Frequency
• 55µA No Load Quiescent Current
• 100% Duty Cycle Low-Dropout Operation
• Internal Soft-Start
• Over-Temperature and Current Limit Protection
• <1µA Shutdown Current
• -40°C to +85°C Temperature Range
• Pb-Free/Halogen Free Package
•
RoHS/REACH Compliant
Pin Assignments
Applications
• Cellular Phone
• Digital Cameras
• Hard Disk Drives
• MP3 Players
• PDAs and Handheld Computers
• Portable Media Players
• USB Devices
• Wireless Network Cards