PAM2321
3MHz,Fast Transient 2A Step-Down Converter
Features
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2A Maximum Output Current
Tiny 0.47uH Chip Inductor
Excellent Transient Response
Input Voltage: 2.7V to 5.5V
Fixed or Adjustable Output Voltage
Options:
- Fixed Output Voltage: 1.2V
- Adjustable Output Voltage: 1.0V to Vin
High Efficiency with 3MHz Switching
Frequency
55uA No Load Quiescent Current
100% Duty Cycle Low-Dropout Operation
Internal Soft Start
Over-Temperature and Current Limit
Protection
<
1uA Shutdown Current
-40°C to 85°C Temperature Range
Pb-Free/Halogen Free Package
RoHS/REACH Compliant
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 2 A maximum output
current while consuming only 55uA 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 PAM 23 21 p r ov id es ex c el le nt tr an s ie nt
r es p o n s e a n d o u tp ut a c c ur a c y a c r o s s th e
operating range.
T h e PA M 2 3 2 1 m a i n t a i n s h i g h e f f i c i e n c y
th r ou g h o u t th e l o a d r a n g e . Th e PA M 2 3 2 1
automatically optimizes efficiency during light
l oa d m o de ( P S M) an d m a i nt a i n s c o n s ta n t
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.
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Applications
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Cellular Phone
Digital Cameras
Hard Disk Drives
MP3 Players
PDAs and Handheld Computers
Portable Media Players
USB Devices
Wireless Network Cards
Typical Application
L1
Vin
PVIN
EN
C1
10µF
C3
1.0µF
SW
SW
FB
PGND
Vout
Cfw
100pF
C2
10µF
R2
0.47uH
R1
VIN
AGND
Vout=0.6* (1+R1/R2)
Power Analog Microelectronics
,
Inc
www.poweranalog.com
01/2013 Rev1.2
1
PAM [ POWER ANALOG MICOELECTRONICS ]
