LT3070 - 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator
Features
- Output Current: 5A
- Dropout Voltage: 85mV Typical
- Digitally Programmable VOUT : 0.8V to 1.8V
- Digital Output Margining: ±1%, ±3% or ±5%
- Low Output Noise: 25μVRMS (10Hz to 100kHz)
- Parallel Multiple Devices for 10A or More
- Precision Current Limit: ±20%
- ±1% Accuracy Over Line, Load and Temperature
- Stable with Low ESR Ceramic Output Capacitors (15μF Minimum)
- High Frequency PSRR: 30dB at 1MHz
- Enable Function Turns Output On/Off
- VIOC Pin Controls Buck Converter to Maintain Low Power Dissipation and Optimize Efficiency
- PWRGD/UVLO/Thermal Shutdown Flag
- Current Limit with Foldback Protection
- Thermal Shutdown
- 28-Lead (4mm × 5mm × 0.75mm) QFN Package
Typical Application
Description
The LT3070 is a low voltage, UltraFast™ transient response linear regulator. The device supplies up to 5A of output current with a typical dropout voltage of 85mV. A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS. The LT3070’s high bandwidth permits the use of low ESR ceramic capacitors, saving bulk capacitance and cost. The LT3070’s features make it ideal for high performance FPGAs, microprocessors or sensitive communication supply applications.
Output voltage is digitally selectable in 50mV increments over a 0.8V to 1.8V range. A margining function allows the user to adjust system output voltage in increments of ±1%, ±3% or ±5%. The IC incorporates a unique tracking function to control a buck regulator powering the LT3070’s input. This tracking function drives the buck regulator to maintain the LT3070’s input voltage to VOUT + 300mV, minimizing power dissipation.
Internal protection includes UVLO, reverse-current protection, precision current limiting with power foldback and thermal shutdown. The LT3070 regulator is available in a thermally enhanced 28-lead, 4mm × 5mm QFN package.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT3070EUFD#PBF | 4x5 QFN-28 | UFD | E | 05-08-1712 | Yes |
| LT3070EUFD#TRPBF | 4x5 QFN-28 | UFD | E | 05-08-1712 | Yes |
| LT3070IUFD#PBF | 4x5 QFN-28 | UFD | I | 05-08-1712 | Yes |
| LT3070IUFD#TRPBF | 4x5 QFN-28 | UFD | I | 05-08-1712 | Yes |
| LT3070MPUFD | 4x5 QFN-28 | UFD | MP | 05-08-1712 | No |
| LT3070MPUFD#PBF | 4x5 QFN-28 | UFD | MP | 05-08-1712 | Yes |
| LT3070MPUFD#TR | 4x5 QFN-28 | UFD | MP | 05-08-1712 | No |
| LT3070MPUFD#TRPBF | 4x5 QFN-28 | UFD | MP | 05-08-1712 | 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 | |
|---|---|---|---|---|---|---|
| LT3070EUFD#PBF | 4x5 QFN-28 | E | $6.00 | $4.20 | Yes | |
| LT3070EUFD#TRPBF | 4x5 QFN-28 | E | $4.26 | Yes | ||
| LT3070IUFD#PBF | 4x5 QFN-28 | I | $6.86 | $4.80 | Yes | |
| LT3070IUFD#TRPBF | 4x5 QFN-28 | I | $4.86 | Yes | ||
| LT3070MPUFD | 4x5 QFN-28 | MP | $16.20 | $11.34 | No | |
| LT3070MPUFD#PBF | 4x5 QFN-28 | MP | $16.20 | $11.34 | Yes | |
| LT3070MPUFD#TR | 4x5 QFN-28 | MP | $16.26 | $11.40 | No | |
| LT3070MPUFD#TRPBF | 4x5 QFN-28 | MP | $16.26 | $11.40 | 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 |
|---|---|---|---|
| DC1433A | LT3070EUFD Demo Board | 5A, Low Noise, Digitally Prog Output, Very Low Dropout Linear Regulator, 1.2V ≤ VIN ≤ 3V, Vout = 0.8V to 1.8V @ 5A | $175.00 | |
| Buy Now | |||
Applications
- FPGA and DSP Supplies
- ASIC and Microprocessor Supplies
- Servers and Storage Devices
- Post Buck Regulation and Supply Isolation
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Design Tools
LTspice
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LT3070
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.
