PAM2321 Datasheet, PDF (1/11 Pages) Power Analog Micoelectronics – 3MHz,Fast Transient 2A Step-Down Converter

PAM2321
3MHz,Fast Transient 2A Step-Down Converter
Features
n 2A Maximum Output Current
n Tiny 0.47uH Chip Inductor
n Excellent Transient Response
n Input Voltage: 2.7V to 5.5V
n Fixed or Adjustable Output Voltage
Options:
- Fixed Output Voltage: 1.2V
- Adjustable Output Voltage: 1.0V to Vin
n High Efficiency with 3MHz Switching
Frequency
n 55uA No Load Quiescent Current
n 100% Duty Cycle Low-Dropout Operation
n Internal Soft Start
n Over-Temperature and Current Limit
Protection
n <1uA Shutdown Current
n -40°C to 85°C Temperature Range
n Pb-Free/Halogen Free Package
n RoHS/REACH Compliant
Applications
n Cellular Phone
n Digital Cameras
n Hard Disk Drives
n MP3 Players
n PDAs and Handheld Computers
n Portable Media Players
n USB Devices
n Wireless Network Cards
General 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 3mm x 3mm
footprint and high efficiency make the PAM2321
an ideal choice for portable applications.
The PAM2321 delivers 2A maximum output
current while consuming only 55uA 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, ultra-
small, low profile, TDFN3X3-10 packages. The
product is rated over a temperature range of -
40°C to 85°C.
Typical Application
Vin
C1
10µF
C3
1.0µF
PVIN
EN
VIN
AGND
SW
SW
FB
PGND
L1
0.47uH
R1
R2
Cfw
100pF
Vout
C2
10µF
Vout=0.6* (1+R1/R2)
Power Analog Microelectronics,Inc
www.poweranalog.com
1
01/2013 Rev1.2