Wide Input Range Synchronous Buck Controller
Wide Input Voltage Range: 8V ～ 30V
Up to 93% Efficiency
Programmable Switching Frequency up
No Loop Compensation Required
Programmable CC Current
Available in SOP8L Package
Car Charger / Adaptor
Pre-Regulator for Linear Regulators
Distributed Power Systems
The FT1705 is a synchronous step down
regulator with CC control from a high voltage
input supply. Operating with an input voltage
range of 8V ～ 30V, the FT1705 achieves
4.5A continuous output current with excellent
load and line regulation. The switching
frequency is programmable from 130KHz to
500KHz and the synchronous architecture
provides for highly efficient designs. Current
mode operation provides fast transient
response and eases loop stabilization.
The FT1705 requires a minimum number of
readily available standard external components.
Other features include cable compensation,
programmable current limit and thermal
The FT1705 converters are available in the
industry standard SOP8L packages.
Typical Application Circuit
8V ~ 30V C1
*The output voltage is set by R1 and R2: VOUT = 1.21V • [1 + (R1/ R2)].
* RT: RT is optional. FT1705 can work when keeping RT pin floating. The default frequency is 130KHZ.
The switch frequency is set by RT: RT(kΩ)= 4800000/ (200*fOSC(kHz)-24000)
*The maximum output current is set by RLIM: RLIM (kΩ) = 23• IMAX (A)..