Datasheet Texas Instruments LM1771
| Manufacturer | Texas Instruments |
| Series | LM1771 |
Low-Voltage Synchronous Buck Controller with Precision Enable and No External Compensation
Datasheets
LM1771 Low-Voltage Synchronous Buck Controller With Precision Enable and No External Compensation datasheet
PDF, 1.3 Mb, Revision: D, File published: Jan 8, 2016
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Prices
Status
| LM1771SMM/NOPB | LM1771SSD/NOPB | LM1771TMM/NOPB | LM1771TSD/NOPB | LM1771UMM/NOPB | LM1771USD/NOPB | |
|---|---|---|---|---|---|---|
| Lifecycle Status | Active (Recommended for new designs) | Active (Recommended for new designs) | Active (Recommended for new designs) | Active (Recommended for new designs) | Active (Recommended for new designs) | Active (Recommended for new designs) |
| Manufacture's Sample Availability | Yes | No | Yes | Yes | Yes | Yes |
Packaging
| LM1771SMM/NOPB | LM1771SSD/NOPB | LM1771TMM/NOPB | LM1771TSD/NOPB | LM1771UMM/NOPB | LM1771USD/NOPB | |
|---|---|---|---|---|---|---|
| N | 1 | 2 | 3 | 4 | 5 | 6 |
| Pin | 8 | 6 | 8 | 6 | 8 | 6 |
| Package Type | DGK | NGG | DGK | NGG | DGK | NGG |
| Industry STD Term | VSSOP | WSON | VSSOP | WSON | VSSOP | WSON |
| JEDEC Code | R-PDSO-G | S-PDSO-N | R-PDSO-G | S-PDSO-N | R-PDSO-G | S-PDSO-N |
| Package QTY | 1000 | 1000 | 1000 | 1000 | 1000 | 1000 |
| Carrier | SMALL T&R | SMALL T&R | SMALL T&R | SMALL T&R | SMALL T&R | SMALL T&R |
| Device Marking | SNRB | 1771S | SNSB | 1771T | SNTB | 1771U |
| Width (mm) | 3 | 3 | 3 | 3 | 3 | 3 |
| Length (mm) | 3 | 3 | 3 | 3 | 3 | 3 |
| Thickness (mm) | .97 | .8 | .97 | .8 | .97 | .8 |
| Pitch (mm) | .65 | .95 | .65 | .95 | .65 | .95 |
| Max Height (mm) | 1.07 | .8 | 1.07 | .8 | 1.07 | .8 |
| Mechanical Data | Download | Download | Download | Download | Download | Download |
Parametrics
| Parameters / Models | LM1771SMM/NOPB | LM1771SSD/NOPB | LM1771TMM/NOPB | LM1771TSD/NOPB | LM1771UMM/NOPB | LM1771USD/NOPB |
|---|---|---|---|---|---|---|
| Control Mode | Constant on-time (COT) | Constant on-time (COT) | Constant on-time (COT) | Constant on-time (COT) | Constant on-time (COT) | Constant on-time (COT) |
| Duty Cycle(Max), % | 98 | 98 | 98 | 98 | 98 | 98 |
| Iout(Max), A | 6 | 6 | 6 | 6 | 6 | 6 |
| Iq(Typ), mA | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Number of Phases | 1 | 1 | 1 | 1 | 1 | 1 |
| Operating Temperature Range, C | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 |
| Package Group | VSSOP | WSON | VSSOP | WSON | VSSOP | WSON |
| Rating | Catalog | Catalog | Catalog | Catalog | Catalog | Catalog |
| Regulated Outputs | 1 | 1 | 1 | 1 | 1 | 1 |
| Special Features | Enable | Enable | Enable | Enable | Enable | Enable |
| Switching Frequency(Max), kHz | 2000 | 2000 | 2000 | 2000 | 2000 | 2000 |
| Switching Frequency(Min), kHz | 500 | 500 | 500 | 500 | 500 | 500 |
| Type | Controller | Controller | Controller | Controller | Controller | Controller |
| Vin(Max), V | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 |
| Vin(Min), V | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 |
| Vout(Max), V | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 |
| Vout(Min), V | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
Eco Plan
| LM1771SMM/NOPB | LM1771SSD/NOPB | LM1771TMM/NOPB | LM1771TSD/NOPB | LM1771UMM/NOPB | LM1771USD/NOPB | |
|---|---|---|---|---|---|---|
| RoHS | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Application Notes
- LM1771 and LM3880 Based FPGA Power Supply Reference Design (Rev. A)PDF, 103 Kb, Revision: A, File published: May 5, 2013
This application note discusses the Virtex-5 FPGA power supply prerequisites in terms of the multiplevoltage rail and current level requirements, output sequencing, and startup characteristics. - Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A)PDF, 178 Kb, Revision: A, File published: Apr 23, 2013
Of all the voltage regulator control strategies ever devised, the hysteretic regulator is probably about thesimplest. This control methodology simply turns a switch on when the output voltage is below a referenceand turns the switch off when the output rises to a slightly higher reference. The output ripple is thereforea direct function of the difference between the upper and lower reference
Model Line
Series: LM1771 (6)
Manufacturer's Classification
- Semiconductors> Power Management> Non-isolated DC/DC Switching Regulator> Step-Down (Buck)> Buck Controller (External Switch)
