The LTC®1174 is a simple current mode DC/DC converter ideally suited for 9V to 5V, 5V to 3.3V or 5V to –5V operation. With an internal 0.9Ω switch (at a supply voltage of 9V), the LTC1174 requires only four external components to construct a complete high efficiency DC/DC converter. Under a no load condition the LTC1174 draws only 130µA. In shutdown, it draws a mere 1µA making this converter ideal for current sensitive applications. In dropout, the internal P-channel MOSFET switch is turned on continu- ously allowing the user to maximize the life of the battery source. The maximum inductor current of the LTC1174 family is pin selectable to either 340mA or 600mA, optimizing efficiency for a wide range of applications. Operation up to 200kHz permits the use of small surface mount inductors and capacitor.
The LTC1174 family provides high‑efficiency step‑down and inverting conversion for voltages from 4 V up to 18.5 V. It features a simple current‑mode architecture, an internal 0.9 µA switch, and requires only four external components, making it ideal for battery‑powered designs. The device includes built‑in short‑circuit protection, a low‑battery detector, and a micropower shutdown mode that reduces quiescent current to 1 pA.
Typical applications include portable instruments, battery chargers, and distributed power systems. The datasheet details pin functions, electrical characteristics, typical performance curves, and guidelines for inductor and diode selection to optimize efficiency and ripple current.
| Maximum Efficiency | 94 % |
|---|---|
| Input Voltage Range | 4 V – 12 V |
| Shutdown Current | 1 pA |
| On‑Resistance (Ron) | 0.75 Ω typical |
The LTC1174 can achieve up to 94 % efficiency.
Only four external components are required.
In shutdown the device draws a mere 1 pA.
The LTC1174 operates with an input voltage from 4 V to 12 V (up to 16 V for the HV version).