PAM2303
3A Low Noise Step-Down DC-DC Converter
Features
n
n
n
n
n
n
n
n
n
n
n
n
n
Output Current: Up to 3A
Output Voltage: 0.6V to V
IN
Input Voltage: 2.7 to 5.5V
Efficiency up to 95%
42
μ
A (Typ) No Load Quiescent Current
Shutdown Current: <1
μ
A
100% Duty Cycle Operation
1.5MHz Switching Frequency
Analog Soft Start
No external Compensation Required
Current Limit Protection
Thermal Shutdown
SOP-8(EP), DFN3X3-10 and QFN3X3-16
Package
Description
T h e PA M 2 3 0 3 i s a 3 A s t e p - d o w n D C - D C
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 P WM control per for ms exc ellent
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
c o u n t a n d r e a l i z e h i g h e ff i c i e n c y. D u r i n g
shutdown, the input is disconnected from the
output and the shutdown current is less than 1
μ
A.
Other key features include over-temperature and
sh or t c ir c uit p r otec ti on , and u nde r -v ol tag e
lockout to prevent deep battery discharge.
The PAM2303 delivers 3A maximum output
current while consuming only 42
μ
A 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.
T h e PA M 2 3 0 3 i s a v a i l a b l e i n S O P - 8 ( E P ) ,
DFN3X3-10, and QFN3X3-16 package.
Applications
n
n
n
n
n
n
5V or 3.3V Point of Load Conversion
Telecom/Networking Equipment
Set Top Boxes
Storage Equipment
Video Cards
DDR Power Supply
Typical Application
U1
L1
VIN
R3
PVIN
SW
2
1
C3
R1 100pF
FB
R2
C2
VOUT
1k
C1
PAM2307
VIN
PAM2303
EN
40uF
22uF
C4
30uF
22uF
1uF
TEST
R
1
V
O
=
0.6
1
+
R
2
Power Analog Microelectronics
,
Inc
www.poweranalog.com
11/2011 Rev1.2
1
PAM [ POWER ANALOG MICOELECTRONICS ]
