PAM2304 Datasheet, PDF (1/14 Pages) Power Analog Micoelectronics – 3MHz, 1A Step-Down DC-DC Converter

Features
n Efficiency up to 95%
n Only 40 μA(TYP.) Quiescent Current
n Output Current: Up to 1A
n Internal Synchronous Rectifier
n 3MHz Switching Frequency
n Soft Start
n Under-Voltage Lockout
n Short Circuit Protection
n Thermal Shutdown
n Small TSOT23-5, TDFN22-8 and
TDFN22-6 Packages
n RoHS Pass and Green Package
Applications
n Smart Phone
n MID
n Portable Electronics
n Wireless Devices
n Cordless Phone
n Computer Peripherals
n Battery Powered Widgets
n Electronic Scales
n Digital Frame
Typical Application
PAM2304
3MHz, 1A Step-Down DC-DC Converter
General Description
The PAM2304 is a step-down current-mode, DC-
DC converter. At heavy load, the constant-
frequency PWM control performs excellent
stability and transient response. To ensure the
longest battery life in portable applications, the
PAM2304 provides a power-saving Pulse-
Skipping Modulation (PSM) mode to reduce
quiescent current under light load operation to
save power.
The PAM2304 supports a range of input voltages
from 2.5V to 5.5V, allowing the use of a single
Li+/Li-polymer cell, multiple Alkaline/NiMH cell,
USB, and other standard power sources. The
output voltage is adjustable from 0.6V to the input
voltage. All versions employ internal power switch
and synchronous rectifierfor 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 1 μA.
Other key features include under-voltage lockout
to prevent deep battery discharge.
The PAM2304 is available in TSOT23-5, TDFN22-
8 and TDFN22-6 packages.
VIN
C _IN
10µF
VIN SW
GND
FB
EN
L
1uH
R1
R2
Cfw
100pF
Vo
Co
10µF
VO
=
0.6 1 +
R1
R2


Power Analog Microelectronics, Inc
www.poweranalog.com
1
11/2011 Rev1.1