CYT 2508
600mA Synchronous Step-Down Regulator
General Description
Features
The CYT2508 is a high efficiency monolithic
synchronous buck regulator using a constant
frequency, voltage mode architecture. The device
is available in fixed output voltage of 1.8V and
1.5V and adjustable output voltage. Supply
current during operation is only 20µA and drop to
≤1uA in shutdown. The 2.5V to 5.5V input voltage
range makes the CYT2508 ideally suited for
single Li-Ion battery-powered applications. 100%
duty cycle provides low dropout operation,
extending battery life in portable systems.
Switching frequency is internally set at 1.25MHz,
allowing the use of small surface mount inductors
and capacitors.
■
High Efficiency: Up to 96%
■
Very Low Quiescent Current: Only 20µA
During Operation
■
■
■
■
■
■
■
■
■
600mA Output Current
2.5V to 5V Input Voltage Range
1.25MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Shutdown Mode draws ≤ 1uA Supply Current
Excellent Line and Load Transient Response
Overtemperature Protection
Available in SOT Package
Applications
The internal synchronous switch increases
efficiency and eliminates the need for an external
Schottky diode. The CYT2508 is available in low
profile SOT-23-5 package.
■
■
■
■
■
■
Cellular Phone
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
SOT-23-5 Package
ShenZhen CYT IC Design CO ,Ltd
1
