The LT
The LT3667 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear regulators (LDOs). The buck regulator includes a high efficiency switch, a boost diode, and the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application.
Each LDO supplies 200mA of output current with a typical dropout voltage of 340mV, and each LDO has an accurate resistor programmable current limit. Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection. The LT3667 is available in a thermally-enhanced 16-Lead MSOP and a 24-Pin 3mm x 5mm QFN package with exposed pad for low thermal resistance.
| Buck Regulator Output Current | 400mA |
|---|---|
| LDO Output Current | 200mA |
| Buck Input Voltage Range | 4.3V to 40V (60V Max) |
| LDO Input Voltage Range | 1.6V to 45V |
| Switching Frequency Range | 250kHz to 2.2MHz |
| Typical Dropout Voltage (LDO) | 340mV |
| Package Options | 16-Lead MSOP and 24-Lead QFN |
The device supports an input operation range up to a maximum of 40V.
Each low dropout linear regulator has a typical dropout voltage of 340mV.
Each low dropout linear regulator supplies a maximum output current of 200mA.