CM3706 Datasheet, PDF (1/11 Pages) Champion Microelectronic Corp. – 1.5MHz, 600mA Synchronous Step-Down Regulator

GENERAL DESCRIPTION
CM3706
1.5MHz, 600mA Synchronous
Step-Down Regulator
FEATURES
The CM3706 is a 1.5MHz constant frequency, slope
compensated current mode PWM step-down converter.
The device integrates a main switch and a synchronous
rectifier for high efficiency without an external Schottky
diode. It is ideal for powering portable equipment that runs
from a single cell lithium-Ion (Li+) battery. The CM3706
can supply 600mA of load current from a 2.5V to 5.5V
input voltage. The output voltage can be regulated as
low as 0.6V. The CM3706 can also run at 100% duty cycle
for low dropout operation, extending battery life in portable
system. Idle mode operation at light loads provides very
low output ripple voltage for noise sensitive applications.
The CM3706 is offered in a low profile (1mm) 5-pin, thin
TSOT package, and is available in an adjustable version.
◆ High Efficiency: Up to 96%
◆ 1.5Mhz Constant Switching Frequency
◆ 600mA Output Current at V_IN=3V
◆ Integrated Main switch and synchronous rectifier. No
Schottky Diode Required
◆ 2.5V to 5.5V Input Voltage Range
◆ Output Voltage as Low as 0.6V
◆ 100% Duty Cycle in Dropout
◆ Low Quiescent Current: 300µA
◆ Slope Compensated Current Mode Control for Excellent Line
and Load Transient Response
◆ Short Circuit Protection
◆ Thermal Fault Protection
◆ <1uA Shutdown Current
◆ Space Saving 5-Pin Thin TSOT23 package
APPLICATIONS
Cellular and Smart Phones
Microprocessors and DSP Core Supplies
Wireless and DSL Modems
PDAs
MP3 Players
Portable Instruments
Digital Still and Video Cameras
TYPICAL APPLICATIONS
IN
2.5V TO
5.5V
Cin
4.7uF
4
3
VIN
SW
CM3706
1 ^{RUN GND V FB} 5
2
316K
2.2uH
634k
22PF
OUT
Cout
10uF
Figure 1. Basic Application Circuit with CM3706 adjustable version
2006/12/20Rev. 1.6
Champion Microelectronic Corporation
Page 1