1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

The LTC3406-1.2 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation with only 20µA drops <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406-1.2 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 further increases efficiency at light loads.

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. The LTC3406-1.2 is available in a low profile (1mm) ThinSOT package.

Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.

Vout

Fsw

Features

LTC3406

Adj.

1.5MHz

Burst Mode

LTC3406-1.2

1.2V

1.5MHz

Burst Mode

LTC3406-1.5

1.5V

1.5MHz

Burst Mode

LTC3406-1.8

1.8V

1.5MHz

Burst Mode

LTC3406B

Adj.

1.5MHz

Burst Mode Disabled

LTC3406B-1.2

1.2V

1.5MHz

Burst Mode Disabled

LTC3406B-2

Adj.

2.25MHz

Burst Mode Disabled

LTC3406A

Adj.

1.5MHz

Low Ripple Burst Mode

LTC3406AB

Adj.

1.5MHz

Burst Mode Disabled

LTC3406AB-2

Adj.

2.25MHz

Burst Mode Disabled

Applications

* Cellular Telephones

* Personal Information Appliances

* Wireless and DSL Modems

* Digital Still Cameras

* MP3 Players

* Portable Instruments

* High Efficiency: Up to 90%

* Very Low Quiescent Current: Only 20µA

* 600mA Output Current at VIN = 3V

* 2.5V to 5.5V Input Voltage Range

* 1.5MHz Constant Frequency Operation