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- LTC3025-1/LTC3406-1.5 Demo Circuit - High Efficiency Step-Down Converter with VLDO Output (2.7-5.5V to 1.5V @ 600mA & 1.2V @ 500mA)
- LTC3025/LTC3406-1.5 Demo Circuit - High Efficiency Step-Down Converter with VLDO (2.7-5.5V to 1.5V @ 600mA & 1.2V @ 300mA)
LTpowerCAD
Features
- High Efficiency: Up to 96%
- Very Low Quiescent Current: Only 20µA During Operation
- 600mA Output Current
- 2.5V to 5.5V Input Voltage Range
- 1.5MHz Constant Frequency Operation
- No Schottky Diode Required
- Low Dropout Operation: 100% Duty Cycle
- 0.6V Reference Allows Low Output Voltages
- Shutdown Mode Draws </=1µA Supply Current
- Current Mode Operation for Excellent Line and Load Transient Response
- Overtemperature Protected
- Low Profile (1mm) ThinSOT™ Package
Typical Application
Description
The LTC3406 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.5V and 1.8V. Supply current during operation is only 20µA and drops to <=1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Automatic Burst Mode operation increases efficiency at light loads, further extending battery life.
Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The LTC3406 is available in a low profile (1mm) ThinSOT package.
Protected by U.S. Patents, including 6580258, 5481178.
| Vout | Fsw | Features | |
| LTC3406 | Adj. | 1.5MHz | Burst Mode |
| LTC3406-1.2 | 1.2V | 1.5MHz | Burst Mode |
| LTC3406-1.5 | 1.5V | 1.5MHz | Burst Mode |
| LTC3406-1.8 | 1.8V | 1.5MHz | Burst Mode |
| LTC3406B | Adj. | 1.5MHz | Burst Mode Disabled |
| LTC3406B-1.2 | 1.2V | 1.5MHz | Burst Mode Disabled |
| LTC3406B-2 | Adj. | 2.25MHz | Burst Mode Disabled |
| LTC3406A | Adj. | 1.5MHz | Low Ripple Burst Mode |
| LTC3406AB | Adj. | 1.5MHz | Burst Mode Disabled |
| LTC3406AB-2 | Adj. | 2.25MHz | Burst Mode Disabled |
SOT-23
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3406ABES5#TRMPBF | SOT | 5 | E | $2.61 | $1.88 |
| LTC3406ABES5#TRPBF | SOT | 5 | E | $2.61 | $1.83 |
| LTC3406ABES5-2#TRMPBF | SOT | 5 | E | $2.61 | $1.88 |
| LTC3406ABES5-2#TRPBF | SOT | 5 | E | $2.61 | $1.83 |
| LTC3406AES5#TRMPBF | SOT | 5 | E | $2.61 | $1.88 |
| LTC3406AES5#TRPBF | SOT | 5 | E | $2.61 | $1.83 |
| LTC3406AIS5#PBF | SOT | 5 | I | $3.00 | |
| LTC3406AIS5#TRMPBF | SOT | 5 | I | $3.00 | $2.15 |
| LTC3406AIS5#TRPBF | SOT | 5 | I | $3.00 | $2.10 |
| LTC3406B-2ES5#TRMPBF | SOT | 5 | E | $3.07 | $2.18 |
| LTC3406B-2ES5#TRPBF | SOT | 5 | E | $3.07 | $2.16 |
| LTC3406BES5#TRMPBF | SOT | 5 | E | $2.86 | $2.03 |
| LTC3406BES5#TRPBF | SOT | 5 | E | $2.86 | $2.01 |
| LTC3406BES5-1.2#TRMPBF | SOT | 5 | E | $2.86 | $2.03 |
| LTC3406BES5-1.2#TRPBF | SOT | 5 | E | $2.86 | $2.01 |
| LTC3406BES5-1.5#TRMPBF | SOT | 5 | E | $2.86 | $2.03 |
| LTC3406BES5-1.5#TRPBF | SOT | 5 | E | $2.86 | $2.01 |
| LTC3406BES5-1.8#TRMPBF | SOT | 5 | E | $2.86 | $2.03 |
| LTC3406BES5-1.8#TRPBF | SOT | 5 | E | $2.86 | $2.01 |
| LTC3406ES5#PBF | SOT | 4 | E | $2.86 | |
| LTC3406ES5#TRMPBF | SOT | 5 | E | $2.86 | $2.03 |
| LTC3406ES5#TRPBF | SOT | 5 | E | $2.86 | $2.01 |
| LTC3406ES5-1.2#TRMPBF | SOT | 5 | E | $2.86 | $2.03 |
| LTC3406ES5-1.2#TRPBF | SOT | 5 | E | $2.86 | $2.01 |
| LTC3406ES5-1.5#TRMPBF | SOT | 5 | E | $2.86 | $2.03 |
| LTC3406ES5-1.5#TRPBF | SOT | 5 | E | $2.86 | $2.01 |
| LTC3406ES5-1.8#TRMPBF | SOT | 5 | E | $2.86 | $2.03 |
| LTC3406ES5-1.8#TRPBF | SOT | 5 | E | $2.86 | $2.01 |
| LTC3406ES5 | SOT | 5 | E | $5.72 | |
| LTC3406ES5#TR | SOT | 5 | E | $5.72 | $4.02 |
| LTC3406ES5-1.5 | SOT | 5 | E | $5.72 | |
| LTC3406ES5-1.5#TR | SOT | 5 | E | $5.72 | $4.02 |
| LTC3406ES5-1.8 | SOT | 5 | E | $5.72 | |
| LTC3406ES5-1.8#TR | SOT | 5 | E | $5.72 | $4.02 |
| LTC3406BES5 | SOT | 5 | E | $5.72 | |
| LTC3406BES5#TR | SOT | 5 | E | $5.72 | $4.02 |
| LTC3406BES5-1.5 | SOT | 5 | E | $5.72 | |
| LTC3406BES5-1.5#TR | SOT | 5 | E | $5.72 | $4.02 |
| LTC3406BES5-1.8 | SOT | 5 | E | $5.72 | |
| LTC3406BES5-1.8#TR | SOT | 5 | E | $5.72 | $4.02 |
| LTC3406B-2ES5 | SOT | 5 | E | $6.14 | |
| LTC3406B-2ES5#TR | SOT | 5 | E | $6.14 | $4.32 |
| LTC3406BES5-1.2 | SOT | 5 | E | $5.72 | |
| LTC3406BES5-1.2#TR | SOT | 5 | E | $5.72 | $4.02 |
| LTC3406ES5-1.2 | SOT | 5 | E | $5.72 | |
| LTC3406ES5-1.2#TR | SOT | 5 | E | $5.72 | $4.02 |
| LTC3406B-2ES5#TRM | SOT | 5 | E | $6.14 | $4.36 |
| LTC3406BES5#TRM | SOT | 5 | E | $5.72 | $4.06 |
| LTC3406BES5-1.2#TRM | SOT | 5 | E | $5.72 | $4.06 |
| LTC3406BES5-1.5#TRM | SOT | 5 | E | $5.72 | $4.06 |
| LTC3406BES5-1.8#TRM | SOT | 5 | E | $5.72 | $4.06 |
| LTC3406ES5#TRM | SOT | 5 | E | $5.72 | $4.06 |
| LTC3406ES5-1.2#TRM | SOT | 5 | E | $5.72 | $4.06 |
| LTC3406ES5-1.5#TRM | SOT | 5 | E | $5.72 | $4.06 |
| LTC3406ES5-1.8#TRM | SOT | 5 | E | $5.72 | $4.06 |
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 |
|---|---|---|---|
| DC500A-B | LTC3406ES5-1.5 Demo Board | 2.7V to 5.5Vin, 1.5Vout @ 600mA(max) | $75.00 |