The LTC3704 is a wide input range, current mode, positive-to-negative DC/DC controller that drives an N-channel power MOSFET and requires very few external components. Intended for low to high power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, thereby maxi- mizing efficiency.
The LTC3704 is a current‑mode, positive‑to‑negative DC/DC controller that drives an N‑channel power MOSFET with very few external components. It operates over a wide input range (2.5 V to 36 V) and can be programmed for a switching frequency from 50 kHz to 1 MHz. The device includes an internal 5.2 V low‑dropout regulator and supports both burst‑mode and continuous‑mode operation.
Typical applications include SLIC power supplies, telecom power supplies, portable equipment, cable/DSL modems, and router supplies. Pin functions, block diagram, and typical performance curves are provided to aid design integration.
| Input Voltage Range | 2.5 V to 36 V |
|---|---|
| Maximum Duty Cycle (typical) | 92 % |
| Programmable Switching Frequency | 50 kHz to 1 MHz |
| Internal Regulator Output | 5.2 V |
| Operating Temperature Range | -40 °C to 85 °C (LTC3704E) / -40 °C to 125 °C (LTC3704I) |
| Shutdown Quiescent Current | 10 µA |
The device is rated for an input voltage up to 36 V.
It operates from –40 °C to 85 °C (standard) and up to 125 °C for the LTC3704I version.
Yes, the MODE/SYNC pin allows synchronization to an external clock up to 1.3 × the nominal frequency.