DocumentationDatasheet
Reliability Data
LT Journal
- Easy, ±5V Split-Voltage Power Supply for Analog Circuits Draws Only 720nA at No Load
- Nanopower Buck Converter Runs on 720nA, Easily Fits into Energy Harvesting and Other Low Power Applications
Article
Press Release
cad_symbol
ltspice
Features
- 720nA Input IQ in Regulation (No Load), VIN = 4V
- 820nA Input IQ in Regulation (No Load), VIN = 20V
- 400nA Input IQ in UVLO
- 2.7V to 20V Input Operating Range
- Up to 50mA of Output Current
- Pin Selectable Output Voltages:
1.2V, 1.5V, 1.8V, 2.5V (LTC3388-1)
2.8V, 3.0V, 3.3V, 5.0V (LTC3388-3) - High Efficiency Hysteretic Synchronous DC/DC Conversion
- Standby Mode Disables Buck Switching
- Available in 10-Lead MSE and 3mm × 3mm DFN Packages
Typical Application
Description
The LTC3388-1/LTC3388-3 are high efficiency step-down DC/DC converters with internal high side and synchronous power switches that draw only 720nA typical DC supply current at no load while maintaining output voltage regulation.
Capable of supplying 50mA of load current, the LTC3388-1/ LTC3388-3 also incorporate an accurate undervoltage lockout (UVLO) feature to disable the converter and maintain a low quiescent current state when the input voltage falls below 2.3V. In regulation, the LTC3388-1/LTC3388-3 enter a sleep state in which both input and output quiescent currents are minimal. The buck converter turns on and off as needed to maintain regulation. An additional standby mode disables buck switching while the output is in regulation for short duration loads requiring low ripple.
Output voltages of 1.2V, 1.5V, 1.8V, 2.5V (LTC3388-1) and 2.8V, 3.0V, 3.3V, 5.0V (LTC3388-3) are pin selectable. The LTC3388-1/LTC3388-3 can operate with VIN up to 20V while the no load quiescent current remains below 1μA.
3x3 DFN-10,MS-10E
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3388EDD-1#PBF | DFN | 10 | E | $4.22 | $2.95 |
| LTC3388EDD-1#TRPBF | DFN | 10 | E | $3.01 | |
| LTC3388EDD-3#PBF | DFN | 10 | E | $4.22 | $2.95 |
| LTC3388EDD-3#TRPBF | DFN | 10 | E | $3.01 | |
| LTC3388EMSE-1#PBF | MSOP | 10 | E | $4.22 | $2.95 |
| LTC3388EMSE-1#TRPBF | MSOP | 10 | E | $3.01 | |
| LTC3388EMSE-3#PBF | MSOP | 10 | E | $4.22 | $2.95 |
| LTC3388EMSE-3#TRPBF | MSOP | 10 | E | $3.01 | |
| LTC3388IDD-1#PBF | DFN | 10 | I | $4.96 | $3.47 |
| LTC3388IDD-1#TRPBF | DFN | 10 | I | $3.53 | |
| LTC3388IDD-3#PBF | DFN | 10 | I | $4.96 | $3.47 |
| LTC3388IDD-3#TRPBF | DFN | 10 | I | $3.53 | |
| LTC3388IMSE-1#PBF | MSOP | 10 | I | $4.96 | $3.47 |
| LTC3388IMSE-1#TRPBF | MSOP | 10 | I | $3.53 | |
| LTC3388IMSE-3#PBF | MSOP | 10 | I | $4.96 | $3.47 |
| LTC3388IMSE-3#TRPBF | MSOP | 10 | I | $3.53 | |
| LTC3388IDD-3 | DFN | 10 | I | $9.92 | $6.94 |
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 |
|---|---|---|---|
| DC1658A-A | LTC3388EMSE-1 Demo Board | 2.7V ≤ VIN ≤ 20V, VOUT = 1.2V to 2.5V @ 50mA | $175.00 | |
| DC1658A-B | LTC3388EMSE-3 Demo Board | 2.8V ≤ VIN ≤ 20V, VOUT = 2.8V to 5V @ 50mA | $175.00 |