Linear Technology Corp.’s LTC3858/-1 low quiescent current, 2-phase dual output synchronous step-down DC/DC controller draws only 170µA with one output active and only 0.3mA when both outputs are active. With both outputs shut down, the LTC3858/-1 draws a mere 8µA, which is ideal for automotive and notebook PC applications.
The LTC3858/-1’s wide input supply range of 4V to 38V protects against automotive wide input voltage transients commonly found during load dump and cold crank conditions and to cover a broad range of battery chemistries. Each output can be set from 0.8V to 24V at output currents up to 20A with efficiency as high as 95 percent. The LTC3858/-1 is suitable for powering high performance systems including navigation, audio, communications, CD/DVD players and disk drives.
The LTC3858/-1 has 1.1Ω on-board MOSFET gate drivers and operates with an adjustable fixed frequency between 50kHz and 900kHz, or can be synchronized to an external clock from 75kHz to 850kHz using its phase-locked-loop (PLL). Its two-phase operation reduces input capacitance requirements, while its current mode architecture provides easy loop compensation and fast transient response. Both outputs have adjustable soft-start to control the turn-on time and the output overload protection feature latches off the converter until the input voltage is recycled. The LTC3858/-1 also features a tight ±1 percent reference voltage accuracy over the operating temperature range of -40°C to 85°C.
Linear Technology Corp.Caption
Linear Technology’s LTC3858/-1 dual output synchronous step-down DC/DC controller draws only 170µA with one output active and only 0.3mA when both outputs are active.
