LTC3119 - 18V, 5A Synchronous Buck-Boost DC/DC Converter
Features
- Input Voltage Range: 2.5V to 18V
- Runs Down to VIN = 250mV After Start-Up
- Output Voltage Range: 0.8V to 18V
- 5A Output Current in Buck Mode, VIN > 6V
- 3A Output Current for VIN = 3.6V, VOUT = 5V
- Programmable Switching Frequency: 400kHz to 2MHz
- Synchronizable with an External Clock Up to 2MHz
- Accurate Run Comparator Threshold
- Burst Mode® Operation, No-Load IQ = 35μA
- Ultralow Noise Buck-Boost PWM
- Current Mode Control
- Maximum Power Point Control
- Power Good Indicator
- Internal Soft-Start
- 28-Lead 4mm × 5mm QFN and TSSOP Packages
Typical Application
Description
The LTC®3119 is a high efficiency 18V monolithic buck-boost converter that can deliver up to 5A of continuous output current. Extensive feature integration and very low resistance internal power switches minimize the total solution footprint for even the most demanding applications. A proprietary 4-switch PWM architecture provides seamless low noise operation from input voltages above, equal to, or below the output voltage.
External frequency programming as well as synchronization using an internal PLL enable operation over a wide switching frequency range of 400kHz to 2MHz. The wide 2.5V to 18V input range is well suited for operation from unregulated power sources including battery stacks and backup capacitors. After start-up, operation is possible with input voltages as low as 250mV.
Other features include: output short-circuit protection, thermal overload protection, less than 3μA shutdown current, power good indicator, Burst Mode operation, and maximum power point control.
The LTC3119 is offered in thermally enhanced 28-lead 4mm × 5mm QFN and TSSOP packages.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3119EFE#PBF | TSSOP-28 | FE | E | 05-08-1663 (EA) | Yes |
| LTC3119EFE#TRPBF | TSSOP-28 | FE | E | 05-08-1663 (EA) | Yes |
| LTC3119EUFD#PBF | 4x5 QFN-28 | UFD | E | 05-08-1712 | Yes |
| LTC3119EUFD#TRPBF | 4x5 QFN-28 | UFD | E | 05-08-1712 | Yes |
| LTC3119HFE#PBF | TSSOP-28 | FE | H | 05-08-1663 (EA) | Yes |
| LTC3119HFE#TRPBF | TSSOP-28 | FE | H | 05-08-1663 (EA) | Yes |
| LTC3119IFE#PBF | TSSOP-28 | FE | I | 05-08-1663 (EA) | Yes |
| LTC3119IFE#TRPBF | TSSOP-28 | FE | I | 05-08-1663 (EA) | Yes |
| LTC3119IUFD#PBF | 4x5 QFN-28 | UFD | I | 05-08-1712 | Yes |
| LTC3119IUFD#TRPBF | 4x5 QFN-28 | UFD | I | 05-08-1712 | Yes |
| LTC3119MPFE#PBF | TSSOP-28 | FE | MP | 05-08-1663 (EA) | Yes |
| LTC3119MPFE#TRPBF | TSSOP-28 | FE | MP | 05-08-1663 (EA) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3119EFE#PBF | TSSOP-28 | E | $10.50 | $7.35 | Yes | |
| LTC3119EFE#TRPBF | TSSOP-28 | E | $10.56 | $7.41 | Yes | |
| LTC3119EUFD#PBF | 4x5 QFN-28 | E | $10.22 | $7.15 | Yes | |
| LTC3119EUFD#TRPBF | 4x5 QFN-28 | E | $10.28 | $7.21 | Yes | |
| LTC3119HFE#PBF | TSSOP-28 | H | $11.43 | $8.00 | Yes | |
| LTC3119HFE#TRPBF | TSSOP-28 | H | $11.49 | $8.06 | Yes | |
| LTC3119IFE#PBF | TSSOP-28 | I | $11.00 | $7.70 | Yes | |
| LTC3119IFE#TRPBF | TSSOP-28 | I | $11.06 | $7.76 | Yes | |
| LTC3119IUFD#PBF | 4x5 QFN-28 | I | $10.64 | $7.45 | Yes | |
| LTC3119IUFD#TRPBF | 4x5 QFN-28 | I | $10.70 | $7.51 | Yes | |
| LTC3119MPFE#PBF | TSSOP-28 | MP | $28.36 | $19.85 | Yes | |
| LTC3119MPFE#TRPBF | TSSOP-28 | MP | $28.42 | $19.91 | Yes | |
| Buy Now • Request Samples | ||||||
Demo Boards
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 |
|---|---|---|---|
| DC2129A | LTC3119 Demo Board | Sync Buck-Boost, 2.5V ≤ VIN ≤ 18V, VOUT = 5V @ Up to 5A | $225.00 | |
| Buy Now | |||
Applications
- Wide Input Range Power Supplies
- 1- to 4-Cell Lithium Battery Powered Products
- RF Power Supplies
- Solar Battery Chargers
- System Backup Power Supplies
- Lead Acid to 12V Regulator
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Design Tools
Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:
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Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.