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Diodes Semiconductor Electronic Components Datasheet

PAM2321 Datasheet

FAST TRANSIENT 2A STEP-DOWN CONVERTER

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A Product Line of
Diodes Incorporated
PAM2321
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 RDS(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 VIN
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
PAM2321
Document number: DSxxxxx Rev. 2 - 1
1 of 11
www.diodes.com
January 2013
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

PAM2321 Datasheet

FAST TRANSIENT 2A STEP-DOWN CONVERTER

No Preview Available !

Typical Applications Circuit
A Product Line of
Diodes Incorporated
PAM2321
VOUT = 0.6 * (1+ R1/ R2)
Pin Descriptions
Pin
Name
PGND
PVIN
VIN
FB
AGND
EN
SW
EP
Function
Main power ground return pin. Connect to the output and input capacitor return.
Input power supply tied to the source of the high side P-Channel MOSFET.
Power supply; supplies power for the internal circuitry.
Feedback input pin. This pin is connected directly to the converter output for the 1.2V fixed output version, or connected to an
external resistor divider for the adjustable output version.
Analog ground. This pin is internally connected to the analog ground of the control circuitry.
Enable pin. A logic low disables the converter and it consumes less than 1μA of current. When connected high, it resumes normal
operation.
Switching node. Connect the inductor to this pin. It is internally connected to the drain of both high and low side MOSFETs.
Exposed pad of the package provides both electrical contact to the ground and good thermal
contact to the PCB. This pad must be soldered to the PCB for proper operation.
Functional Block Diagram
PAM2321
Document number: DSxxxxx Rev. 2 - 1
2 of 11
www.diodes.com
January 2013
© Diodes Incorporated


Part Number PAM2321
Description FAST TRANSIENT 2A STEP-DOWN CONVERTER
Maker Diodes
Total Page 11 Pages
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