General
Description
The
CM3706A
is
a
high
efficiency
monolithic
synchronous
buck regulator
using a
constant
frequency,current
mode
architecture. The
device
is
available
in
an
adjustable
version and fixed
output
voltages,
such
as
1.2V,
1.5V,1.8V, etc. Supply
current
with
no
load
is
300uA
and
drops
to
<1uA
in shutdown.
The 2.5V
to 6.5V
input
voltage range
makes the CM3706A
ideally
suited
for
single
Li-Ion,
two
to four
AA
battery-powered
applications.
100%
duty
cycle
provides
low
dropout
operation,
extending
battery
life
in portable
systems.
PWM
pulse
skipping
mode
operation
provides
very
low
output
ripple
voltage
for
noise
sensitive
applications.
Switching
frequency
is
internally
set
at
1.5MHz, allowing
the
use
of
small
surface
mount
inductors
and capacitors.
The
internal
synchronous
switch
increases
efficiency
and
eliminates
the
need
for
an
external
Schottky
diode.
Low
output
voltages
are
easily
supported
with
the 0.6V feedback
reference
voltage.
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Features
-
High
Efficiency: Up to
96%
-
1.5Mhz
Constant Switching
Frequency
-
600mA
Output Current at VIN=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
- Cellular and Smart Phones
- Microprocessors and DSP
Core
Supplies
- Wireless
and
DSL Modems
- PDAs
- MP3 / MP4 Player
- Portable
Instruments
- Digital
Still and Video Cameras
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Packages
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