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- LTC3525-3 Demo Circuit - Compact, High Efficiency Boost for Single Cell Alkaline (1-1.6V to 3V @ 65mA)
- LTC3525-3.3 Demo Circuit - Compact, High Efficiency Boost for Two Cell Alkaline or NiMH (1.8-3.2V to 3.3V @ 140mA)
- LTC3525-3.3 Demo Circuit - Single Alkaline or NiMH to 3.3V Converter (1-1.6V to 3.3V @ 60mA)
- LTC3525-5 Demo Circuit - Compact, High Efficiency Boost for Single Cell Li-Ion (3-4.2V to 5V @ 175mA)
Features
- Up to 95% Efficiency
- Output Disconnect and Inrush Current Limit
- Fixed Output Voltages of 3V, 3.3V or 5V
- Delivers 65mA at 3V from a 1V Input
- Delivers 60mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input
- Delivers 175mA at 5V from a 3V Input
- Burst Mode® Operation: IQ = 7μA
- Only Three External Components
- VIN > VOUT Operation
- <1μA Shutdown Current
- Antiringing Control
- Short-Circuit and Overtemperature Protection
- Very Low Profile of 1mm
- Tiny 6-Lead SC70 Package
Typical Application
Description
The LTC®3525-3/LTC3525-3.3/LTC3525-5 are high efficiency synchronous step-up DC/DC converters with output disconnect that can start up with an input as low as 0.85V. They offer a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline or Li-Ion applications. Only three small external components are required. The LTC3525 is offered in fixed output voltages of 3V, 3.3V or 5V.
The device includes a 0.5Ω N-channel MOSFET switch and a 0.8Ω P-channel synchronous rectifier. Peak switch current ranges from 150mA to 400mA, depending on load, providing enhanced efficiency. Quiescent current is an ultralow 7μA, maximizing battery life in portable applications.
Other features include <1μA shutdown current, antiringing control and thermal shutdown. The LTC3525 is available in a tiny 6-Lead SC70 package.
| List of LTC3525 Options | |||
| PART NAME | INPUT START-UP VOLTAGE | OUTPUT VOLTAGE | VOUT STATUS IN SHUTDOWN MODE |
| LTC3525-3 | 0.85V | 3V | Output Disconnect |
| LTC3525-3.3 | 0.85V | 3.3V | Output Disconnect |
| LTC3525-5 | 0.85V | 5V | Output Disconnect |
| LTC3525D-3.3 | 0.85V | 3.3V | Pass Through Mode |
| LTC3525L-3 | 0.7V | 3V | Output Disconnect |
SC-70,SOT-23
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3525DESC6-3.3#TRMPBF | SC70 | 6 | E | $2.57 | $1.86 |
| LTC3525DESC6-3.3#TRPBF | SC70 | 6 | E | $2.57 | $1.81 |
| LTC3525ESC6-3#TRMPBF | SC70 | 6 | E | $2.57 | $1.83 |
| LTC3525ESC6-3#TRPBF | SC70 | 6 | E | $2.57 | $1.81 |
| LTC3525ESC6-3.3#TRMPBF | SC70 | 6 | E | $2.57 | $1.83 |
| LTC3525ESC6-3.3#TRPBF | SC70 | 6 | E | $2.57 | $1.81 |
| LTC3525ESC6-5#PBF | SC70 | 6 | E | $2.57 | |
| LTC3525ESC6-5#TRMPBF | SC70 | 6 | E | $2.57 | $1.83 |
| LTC3525ESC6-5#TRPBF | SC70 | 6 | E | $2.57 | $1.81 |
| LTC3525LESC6-3#TRMPBF | SC70 | 6 | E | $2.71 | $1.95 |
| LTC3525LESC6-3#TRPBF | SC70 | 6 | E | $2.71 | $1.90 |
| LTC3525ISC6-5#TRMPBF | SC70 | 6 | I | $2.86 | $2.00 |
| LTC3525ISC6-3#TRMPBF | SC70 | 6 | I | $2.86 | $2.00 |
| LTC3525ISC6-3#TRPBF | SC70 | 6 | I | $2.86 | $2.00 |
| LTC3525ISC6-5#PBF | SC70 | 6 | I | $2.86 | |
| LTC3525DISC6-3.3#TRMPBF | SC70 | 6 | I | $2.86 | $2.05 |
| LTC3525ISC6-3#PBF | SC70 | 6 | I | $2.86 | |
| LTC3525DISC6-3.3#PBF | SC70 | 6 | I | $2.86 | |
| LTC3525DISC6-3.3#TRPBF | SC70 | 6 | I | $2.86 | $2.00 |
| LTC3525ISC6-3.3#TRPBF | SC70 | 6 | I | $2.86 | $2.00 |
| LTC3525ISC6-3.3#PBF | SC70 | 6 | I | $2.86 | |
| LTC3525ISC6-5#TRPBF | SC70 | 6 | I | $2.86 | $2.00 |
| LTC3525ISC6-3.3#TRMPBF | SC70 | 6 | I | $2.86 | $2.00 |
| LTC3525ESC6-3.3 | SOT | 6 | E | $5.14 | |
| LTC3525ESC6-3.3#TR | SC70 | 6 | E | $5.14 | $3.62 |
| LTC3525ESC6-5#TR | SC70 | 6 | E | $5.14 | $3.62 |
| LTC3525ESC6-3 | SC70 | 6 | E | $5.14 | |
| LTC3525ESC6-3#TR | SC70 | 6 | E | $5.14 | $3.62 |
| LTC3525DESC6-3.3#TR | SC70 | 6 | E | $5.14 | $3.62 |
| LTC3525ESC6-3#TRM | SC70 | 6 | E | $5.14 | $3.66 |
| LTC3525ESC6-3.3#TRM | SC70 | 6 | E | $5.14 | $3.66 |
| LTC3525ESC6-5#TRM | SC70 | 6 | E | $5.14 | $3.66 |
| LTC3525DESC6-3.3#TRM | SC70 | 6 | E | $5.14 | $3.72 |
| LTC3525ISC6-3 | SC70 | 6 | I | $5.72 | |
| LTC3525ISC6-3#TR | SC70 | 6 | I | $5.72 | $4.00 |
| LTC3525ISC6-3.3#TR | SC70 | 6 | I | $5.72 | $4.00 |
| LTC3525ISC6-5#TR | SC70 | 6 | I | $5.72 | $4.00 |
| LTC3525DISC6-3.3#TR | SC70 | 6 | I | $5.72 | $4.00 |
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 |
|---|---|---|---|
| DC879A-A | LTC3525-3.3 Demo Board | Micropower Synchronous Step-Up, 1V to 3.2VIN, 3.3VOUT @ 140mA | $75.00 | |
| DC879A-B | LTC3525-5 Demo Board | Micropower Synchronous Step-Up, 1V to 4.5VIN, 5VOUT @ 175mA | $75.00 |