DCDC REGULATOR
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2010-10-26
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Synchronous Step-Down Regulator
www.szjingzhong.com TEL：0755－26978229 FAX：0755－26978096
1
Synchronous Step-Down Regulator
General Description
The SE3806 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 of 1.5V and 1.8V.Supply current during
operation is only 20μA and drops to ≤1 μA is
shutdown. The 2.5V to 5.5V input voltage range
makes the SE3806 ideally suited for single Li-lon
battery-powered applications.100% duty cycle
provides low dropout operation, extending battery
life in portable systems. Automatic Burst Mode
operation increases efficiency at light loads. further
extending battery life. 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. The SE3806 is
available in a low profile (1mm) Thin SOT package.
Features
High Efficiency：Up to 96%
Very Low Quiescent Current：Only 20μA During
Operation
600mA Output Current
2.5V to 5.5v Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode required
Low Dropout Operation:100% Duty Cycle
0.6V Reference allows low output voltages
Shutdown mode draws ≤ 1 μ A supply current
Current mode operation for excellent line and load
transient response
Over temperature protected
Low profile (1mm) Thin SOT package.
Applications
Cellular telephones
Personal information appliances
Wireless and DSL modems
Digital still cameras
MP3 players
Portable instruments
Ordering Information
Typical Applications
SE3806
SE3806
SE3806
SE3806
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