LTC1174 - High Efficiency Step-Down and Inverting DC/DC Converter
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 continuously 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 capacitors.
For applications requiring higher output current or ultrahigh efficiency, see the LTC1148 data sheet.
Features
Typical Application  | Applications
Packaging  |
Order Information
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LTC1174CN8-3.3#PBF | N-8 | C | $4.35 | $3.50 |
| LTC1174CN8-5#PBF | N-8 | C | $4.35 | $3.50 |
| LTC1174CN8#PBF | N-8 | C | $4.35 | $3.50 |
| LTC1174CS8-3.3#PBF | SO-8 | C | $4.60 | $3.70 |
| LTC1174CS8-3.3#TRPBF | SO-8 | C | $3.76 | |
| LTC1174CS8-5#PBF | SO-8 | C | $4.60 | $3.70 |
| LTC1174CS8-5#TRPBF | SO-8 | C | $3.76 | |
| LTC1174CS8#PBF | SO-8 | C | $4.60 | $3.70 |
| LTC1174CS8#TRPBF | SO-8 | C | $3.76 | |
| LTC1174HVCN8-3.3#PBF | N-8 | C | $5.00 | $4.00 |
| LTC1174HVCN8-5#PBF | N-8 | C | $5.00 | $4.00 |
| LTC1174HVCN8#PBF | N-8 | C | $5.00 | $4.00 |
| LTC1174HVCS8-3.3#PBF | SO-8 | C | $5.25 | $4.15 |
| LTC1174HVCS8-3.3#TRPBF | SO-8 | C | $4.21 | |
| LTC1174HVCS8-5#PBF | SO-8 | C | $5.25 | $4.15 |
| LTC1174HVCS8-5#TRPBF | SO-8 | C | $4.21 | |
| LTC1174HVCS8#PBF | SO-8 | C | $5.25 | $4.15 |
| LTC1174HVCS8#TRPBF | SO-8 | C | $4.21 | |
| LTC1174HVIS8#PBF | SO-8 | I | $5.80 | $4.80 |
| LTC1174HVIS8#TRPBF | SO-8 | I | $4.86 | |
| LTC1174IN8#PBF | N-8 | I | $5.00 | $3.95 |
| LTC1174IS8#PBF | SO-8 | I | $5.25 | $4.15 |
| LTC1174IS8#TRPBF | SO-8 | I | $4.21 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| DC059A-A | LTC1174HV-5 | HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER 5V, @ 380mA | Contact Factory |
| DC059A-B | LTC1174HV-3.3 | HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER 3.3V, @ 400mA | Contact Factory |
| DC059A-C | LTC1174HVCS8 | HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER 3.3V, @ 375mA ADJUSTABLE | Contact Factory |
- LTC1174 Package Drawing LTC1174
- AN66 - Linear Technology Magazine Circuit Collection, Volume II
- DN73 - A Simple High Efficiency, Step-Down Switching Regulator
- DN74 - Techniques for Deriving 3.3V from 5V Supplies
- DN86 - Ultra-Low Power, High Efficiency DC/DC Converter Operates Outside the Audio Band
- DN91 - 5V to 3.3V Circuit Collection
- R245 Reliability Data
- LTC1174 Footprints and Symbols
