25V, 3.5A(IOUT), 2.4MHz Step-Down DC/DC Converter in 3mm x 3mm DFN

Linear Technology Corporation announces the LT1913, a 3.5A, 25V step-down switching regulator packaged in a 3mm x 3mm DFN. The LT1913 operates within a VIN range of 3.6V to 25V, making it suitable for regulating power from a wide variety of sources, including protected automotive batteries, industrial supplies and unregulated wall adapters. Its 4.6A internal switch can deliver up to 3.5A of continuous output current at voltages as low as 0.79V. The LT1913’s switching frequency is user programmable from 200kHz to 2.4MHz, enabling designers to optimize efficiency while avoiding critical noise-sensitive frequency bands and keeping externals small. The combination of its high switching frequency and tiny 3mm x 3mm DFN package ensure a very compact solution foot print.

The LT1913 utilizes a high efficiency 4.6A, 95mOhm switch which can deliver up to 90% efficiency. The necessary boost diode, oscillator, control and logic circuitry are integrated into a single chip. Special design techniques used in the LT1913 enable high efficiency over a wide input voltage range, and the device’s current mode topology enables fast transient response and excellent loop stability. Other features include external synchronization (from 250kHz to 2MHz), a power good flag and soft-start capability.

The LT1913IDD is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature. Both versions are available from stock.

Summary of Features: LT1913

- Wide Input Range: 3.6V to 25V
- 3.5A Maximum Output Current
- Adjustable Switching Frequency: 200kHz to 2.4MHz
- Low Shutdown Current: IQ < 1uA
- Integrated Boost Diode
- Synchronizable Between 250kHz to 2MHz
- Power Good Flag
- Saturating Switch Design: 95mOhm On-Resistance
- 0.790V Feedback Reference Voltage
- Output Voltage: 0.79V to 30V
- Thermal Protection
- Soft-Start Capability
- Small 10-Pin Thermally Enhanced 3mm × 3mm DFN Package