2.25MHz, 300mA Synchronous Step-Down Regulator in SC70

The LTC3410-1.875 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 26µA, dropping to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3410-1.875 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 2.25MHz, allowing the use of small surface mount inductors and capacitors. The LTC3410-1.875 is specifically designed to work well with ceramic output capacitors, achieving very low output voltage ripple and a small PCB footprint.

The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The LTC3410-1.875 is available in a tiny, low profile SC70 package.

Vout

Burst Mode

LTC3410

Adj. Down To 0.8V

Yes

LTC3410B

Adj. Down To 0.8V

No

LTC3410-1.875

Fixed 1.875V

Yes

Applications

* Cellular Telephones

* Wireless and DSL Modems

* Digital Cameras

* MP3 Players

* Portable Instruments

* High Efficiency: Up to 93%

* Very Low Quiescent Current: Only 26µA

* Low Output Voltage Ripple

* 300mA Output Current at VIN = 3V

* 380mA Minimum Peak Switch Current

* 2.5V to 5.5V Input Voltage Range

* 2.25MHz Constant Frequency Operation

* No Schottky Diode Required

* Stable with Ceramic Capacitors

* Shutdown Mode Draws <1µA Supply Current

* ±2% Output Voltage Accuracy

* Current Mode Operation for Excellent Line and Load Transient Response

* Overtemperature Protected

* Available in Low Profile SC70 Package