DocumentationDatasheet
Application Note
Design Note
- 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
Reliability Data
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Features
- High Efficiency: Up to 94%
- Peak Inductor Current Independent of Inductor Value
- Short-Circuit Protection
- Optimized for 5V to –5V Applications
- Wide VIN Range: 4V to 18.5V
- Low Dropout Operation
- Low-Battery Detector
- Pin Selectable Current Limit
- Internal 0.9Ω Power Switch: VIN = 9V
- Only Four External Components Required
- 130µA Standby Current
- Active Low Micropower Shutdown
Typical Application
Description
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.
N-8,SO-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC1174CN8#PBF | PDIP | 8 | C | $4.35 | $3.50 |
| LTC1174CN8-3.3#PBF | PDIP | 8 | C | $4.35 | $3.50 |
| LTC1174CN8-5#PBF | PDIP | 8 | C | $4.35 | $3.50 |
| LTC1174CS8#PBF | SO | 8 | C | $4.60 | $3.70 |
| LTC1174CS8#TRPBF | SO | 8 | C | $3.76 | |
| 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 | |
| LTC1174HVCN8#PBF | PDIP | 8 | C | $5.00 | $4.00 |
| LTC1174HVCN8-3.3#PBF | PDIP | 8 | C | $5.00 | $4.00 |
| LTC1174HVCN8-5#PBF | PDIP | 8 | C | $5.00 | $4.00 |
| LTC1174HVCS8#PBF | SO | 8 | C | $5.25 | $4.15 |
| LTC1174HVCS8#TRPBF | SO | 8 | C | $4.21 | |
| 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 | |
| LTC1174HVIS8#PBF | SO | 8 | I | $5.80 | $4.80 |
| LTC1174HVIS8#TRPBF | SO | 8 | I | $4.86 | |
| LTC1174IN8#PBF | PDIP | 8 | I | $5.00 | $3.95 |
| LTC1174IS8#PBF | SO | 8 | I | $5.25 | $4.15 |
| LTC1174IS8#TRPBF | SO | 8 | I | $4.21 | |
| LTC1174CN8 | PDIP | 8 | C | $8.70 | $7.00 |
| LTC1174CN8-3.3 | PDIP | 8 | C | $8.70 | $7.00 |
| LTC1174CN8-5 | PDIP | 8 | C | $8.70 | $7.00 |
| LTC1174CS8 | SO | 8 | C | $9.20 | $7.40 |
| LTC1174CS8#TR | SO | 8 | C | $7.52 | |
| LTC1174CS8-3.3 | SO | 8 | C | $9.20 | $7.40 |
| LTC1174CS8-3.3#TR | SO | 8 | C | $7.52 | |
| LTC1174CS8-5 | SO | 8 | C | $9.20 | $7.40 |
| LTC1174CS8-5#TR | SO | 8 | C | $7.52 | |
| LTC1174HVCN8 | PDIP | 8 | C | $10.00 | $8.00 |
| LTC1174HVCN8-3.3 | PDIP | 8 | C | $10.00 | $8.00 |
| LTC1174HVCN8-5 | PDIP | 8 | C | $10.00 | $8.00 |
| LTC1174HVCS8 | SO | 8 | C | $10.50 | $8.30 |
| LTC1174HVCS8#TR | SO | 8 | C | $8.42 | |
| LTC1174HVCS8-3.3 | SO | 8 | C | $10.50 | $8.30 |
| LTC1174HVCS8-3.3#TR | SO | 8 | C | $8.42 | |
| LTC1174HVCS8-5 | SO | 8 | C | $10.50 | $8.30 |
| LTC1174HVCS8-5#TR | SO | 8 | C | $8.42 | |
| LTC1174HVIS8 | SO | 8 | I | $11.60 | $9.60 |
| LTC1174HVIS8#TR | SO | 8 | I | $9.72 | |
| LTC1174IN8 | PDIP | 8 | I | $10.00 | $7.90 |
| LTC1174IS8 | SO | 8 | I | $10.50 | $8.30 |
| LTC1174IS8#TR | SO | 8 | I | $8.42 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC059A-A | LTC1174HV-5 | HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER 5V, @ 380mA | $75.00 | |
| DC059A-B | LTC1174HV-3.3 | HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER 3.3V, @ 400mA | $75.00 | |
| DC059A-C | LTC1174HVCS8 | HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER 3.3V, @ 375mA ADJUSTABLE | $75.00 |