LTC3404 - 1.4MHz High Efficiency Monolithic Synchronous Step-Down Regulator

Switching frequency is internally set at 1.4MHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications the LTC3404 can be externally synchronized from 1MHz to 1.7MHz. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low, preventing low frequency ripple from interfering with audio circuitry.

The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.8V feedback reference voltage. The LTC3404 is available in a space saving 8-lead MSOP package.

For higher input voltage (11V abs max) applications, refer to the LTC1877 data sheet.

Features

High Efficiency: Up to 95%
Very Low Quiescent Current: Only 10µA During Operation
600mA Output Current at VIN = 3.3V
2.65V to 6V Input Voltage Range
1.4MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Synchronizable from 1MHz to 1.7MHz
Selectable Burst Mode™ Operation/Pulse Skipping Mode
0.8V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1µA Supply Current
±2% Output Voltage Accuracy
Current Mode Control for Excellent Line and Load Transient Response
Overcurrent and Overtemperature Protected
Available in 8-Lead MSOP Package

Typical Application

Applications

Cellular Telephones
Wireless and DSL Modems
Personal Information Appliances
Portable Instruments
Distributed Power Systems
Battery-Powered Equipment

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3404EMS8#PBF	MS-8	E	$3.19	$2.70
LTC3404EMS8#TRPBF	MS-8	E		$2.76
LTC3404IMS8#PBF	MS-8	I	$4.43	$3.10
LTC3404IMS8#TRPBF	MS-8	I		$3.21
LTC3404MPMS8	MS-8	MP	$6.99	$4.89
LTC3404MPMS8#PBF	MS-8	MP	$6.99	$4.89
LTC3404MPMS8#TR	MS-8	MP	$7.05	$4.95
LTC3404MPMS8#TRPBF	MS-8	MP	$7.05	$4.95

Demo Boards


Part Number	Description	Price
DC413A	LTC3404EMS8 \| High Efficiency Synchronous Buck Regulator, Vin=2.7V-6V, Vout=1.8V @ 200mA	$100.00