Ltc3868 / – 1 operates at a user adjustable fixed frequency of 50KHz to 900khz, and can be synchronized to an external clock of 75khz ~ 850khz by its phase-locked loop (PLL). Under light load, the user can select continuous operation, pulse jump and burst mode ®) Operation. These devices can also be started safely with pre biased load by power on and power off in pulse jump mode. The two-phase operation of ltc3868 / – 1 reduces the demand for input capacitance, and its current mode architecture provides very easy loop compensation and fast transient response. Both outputs have adjustable soft start to control on-time, output overload protection function, lock off converter, and direct current mode Until the input voltage is recycled. The ltc3868 / – 1 also has a strict ± 1.5% reference voltage accuracy in the operating temperature range of – 40 ° C to 85 ° C. The ltc3868 is a fully functional device. In addition to the same functions as the ltc3868-1, it also has other functions, including one clock output, phase modulation, good output of two power supplies and adjustable current limit.

Ltc3868 is packaged in 32 lead 5mmx5mmqfn, and ltc3868-1 is packaged in 28 pin SSOP or 4mmx5mmqfn-28.

Performance characteristics and application range of step-down DC / DC controller ltc3868 / - 1

Performance summary: ltc3868 / – 1

Low quiescent current, 170ua when one output works and 300uA when both outputs work

8ua shutdown current

Wide input voltage range: 4V to 24V

Wide output voltage range: 0.8V to 14V

Synchronous rectification to achieve up to 95% efficiency

Low ripple burst mode operation, pulse jump or continuous conduction mode can be selected

Safe start with pre biased load

Optional fixed operating frequency from 50KHz to 900khz

The PLL can be used to synchronize to the working frequency of 75khz ~ 850khz

Current mode control to achieve very easy loop compensation and current sharing

Adjustable soft start

± 1.5% voltage reference accuracy in the temperature range of – 40 ° C to 85 ° C

Output overvoltage and overcurrent lockout protection

Responsible editor: GT

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