PAM2400 Datasheet, PDF (1/14 Pages) Power Analog Micoelectronics – 3-Pin Synchronous Step-Up DC/DC Converter

PAM2400
3-Pin Synchronous Step-Up DC/DC Converter
Features
n Schottky Diode Embedded, Saving Cost
and Space
n Low Start-up Voltage (0.9V)
n High Efficiency up to 88%
n Low Quiescent Current
n Low Ripple and Noise
n Available Output Voltage: 2.0V,2.7V,2.8V,
3.0V, 3.3V,3.8V and 5.0V
n Space Saving Packages: SOT-89, SOT-23
n Pb-Free Package
Applications
n Pagers
n Cameras
n Wireless Microphones
n Pocket Organizers
n Battery Backup Suppliers
n Portable Instruments
General Description
The PAM2400 is a high efficiency step-up DC/DC
converter, delivering a fixed output voltage of
2.0V, 2.7V, 2.8V, 3.0V, 3.3V, 3.8V or 5.0V. The
device starts up with an input voltage as low as
0.9V at 1mA load. The Pulse Frequency
Modulation (PFM) scheme provides optimized
performance for applications with light load and
low input voltages.
The PAM2400 employs a built-in synchronous
rectifier, instead of requiring an external Schottky
diode, so that to improve system efficiency and
save system cost and PCB area.
The internal PFM control circuit operates at
constant switching frequency of 100KHz. Only
three external components are required. The
space saving SOT-89 and SOT-23 packages make
the PAM2400 ideal for space conscious
applications.
Typical Application
Block Diagram
V_IN
V_O
L1 _SW
100μH
PAM2400
VOUT
VOUT
SW
1M
-
GND
+
+ _CIN
22μF
+ _CO
47μF
GND
1.25V REF
Enable
OSC 100KHz
Power Analog Microelectronics,Inc
www.poweranalog.com
1
12/2007 Rev 1.0