RS8408
1.5MHz, 2A, Synchronous Step-Down
DC/DC Converter
DESCRIPTION
FEATURES
The RS8408 is a 2A step-down DC-DC converter. At
heavy load, the constant-frequency PWM control
performs excellent stability and transient response. No
external compensation components are required
The RS8408 supports a range of input voltages from
2.7V to 5.5V, allowing the use of a single Li+/Li-polymer
cell, multiple Alkaline/NiMH cell,and other standard
power sources. The output voltage is adjustable from
0.6V to the input voltage.
High Efficiency: Up to 95%
1.5MHz Constant Switching Frequency
Integrated Main switch and synchronous rectifier.
No Schottky Diode Required
Shutdown Current: <1μA
2.7V to 5.5V Input Voltage Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Quiescent Current : 45μA (TYP.)
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Short Circuit Protection
The RS8408 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 RS8408 delivers 2A maximum output current while
consuming only 45μA of no-load quiescent current.
Ultra-low RDS(ON) integrated MOSFET and 100% duty
cycle operation make the RS8408 an ideal choice for
high output voltage, high current applications which
require a low dropout threshold.
<1uA Shutdown Current
APPLICATIONS
Smart Phones
Set Top Box
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
The RS8408 is available in SOP-8 package.
BLOCK DIAGRAM
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan