EC3217 Datasheet, PDF (1/16 Pages) E-CMOS Corporation – 1.5MHz, 2A, Synchronous Step-Down Regulator Dropout

1.5MHz, 2A, Synchronous
Step-Down Regulator Dropout
EC3217
GENERAL DESCRIPTION
FEATURES
The EC3217 is a high efficiency monolithic synchronous
buck regulator using a constant frequency, current mode
architecture. The device is available in an adjustable
version . Supply current during operation is only 20mA
and drops to ≤1mA in shutdown. The 2.5V to 5.5V
input voltage range makes the EC3217 ideally suited for
single Li-Ion 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 EC3217 is available in TSOT23-5
package.
● High Efficiency: Up to 96%
● High Efficiency at light loads
● Very Low Quiescent Current: typ. 30uA During
Operation
● 2A 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 ≤1uA Supply Current
● Current Mode Operation for Excellent Line and Load
Transient Response
● Over temperature Protected
● TSOT23-5 Package is Available
Applications
● Cellular Telephones
● Personal Information Appliances
● Wireless and DSL Modems
● Digital Still Cameras
●MP3 Players
● Portable Instruments
Package Types
TSOT23-5
Figure 1. Package Types of EC3217
E-CMOS Corp. (www.ecmos.com.tw)
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