PAM2303 Datasheet, PDF (1/13 Pages) Power Analog Micoelectronics – 3A Low Noise Step-Down DC-DC Converter

PAM2303
3A Low Noise Step-Down DC-DC Converter
Features
n Output Current: Up to 3A
n Output Voltage: 0.6V to V_IN
n Input Voltage: 2.7 to 5.5V
n Efficiency up to 95%
n 42 μA (Typ) No Load Quiescent Current
n Shutdown Current: <1 μA
n 100% Duty Cycle Operation
n 1.5MHz Switching Frequency
n Analog Soft Start
n No external Compensation Required
n Current Limit Protection
n Thermal Shutdown
n SOP-8(EP), DFN3X3-10 and QFN3X3-16
Package
Applications
n 5V or 3.3V Point of Load Conversion
n Telecom/Networking Equipment
n Set Top Boxes
n Storage Equipment
n Video Cards
n DDR Power Supply
Description
The PAM2303 is a 3A step-down DC-DC
converter. It operates in two different modes:
PSM and PWM modes. At light load, it
automactically enters into the PSM mode to
improve efficiency. At heavy load, the constant-
frequency PWM control performs excellent
stability and transient response. No external
compensation components are required.
The PAM2303 supports a range of input voltages
fr om 2.7 V to 5.5 V. The ou tput v olta ge is
adjustable from 0.6V to the input voltage. The
PAM2303 employs 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 over-temperature and
short circuit protection, and under-voltage
lockout to prevent deep battery discharge.
The PAM2303 delivers 3A maximum output
current while consuming only 42μA of no-load
quiescent current. Ultra-low RDS(ON) integrated
MOSFETs and 100% duty cycle operation make
the PAM2303 an ideal choice for high output
voltage, high current applications which require a
low dropout threshold.
The PAM2303 is available in SOP-8(EP),
DFN3X3-10, and QFN3X3-16 package.
Typical Application
VIN
R3
1k
C1
4202uuF
C4
1 uF
U1
PVIN
SW
VIN ^{PPAAMM22330037}
EN
FB
TEST
L1
2
1
C3
R1 100pF
C2
3202uF
R2
VOUT
Power Analog Microelectronics, Inc
www.poweranalog.com
1
VO
=
0.6
1 +
R1
R2


11/2011 Rev1.2