Datasheet Texas Instruments LM1770
| Manufacturer | Texas Instruments |
| Series | LM1770 |
Low-Voltage SOT23 Synchronous Buck Controller With No External Compensation
Datasheets
LM1770 Low-V SOT23 Synch Buck Cntrr w/No Ext Compensation datasheet
PDF, 862 Kb, Revision: C, File published: Apr 3, 2013
Extract from the document
Prices
Status
| LM1770SMF/NOPB | LM1770TMF/NOPB | LM1770TMFX/NOPB | LM1770UMF/NOPB | LM1770UMFX/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) |
| Manufacture's Sample Availability | No | No | Yes | Yes | No |
Packaging
| LM1770SMF/NOPB | LM1770TMF/NOPB | LM1770TMFX/NOPB | LM1770UMF/NOPB | LM1770UMFX/NOPB | |
|---|---|---|---|---|---|
| N | 1 | 2 | 3 | 4 | 5 |
| Pin | 5 | 5 | 5 | 5 | 5 |
| Package Type | DBV | DBV | DBV | DBV | DBV |
| Industry STD Term | SOT-23 | SOT-23 | SOT-23 | SOT-23 | SOT-23 |
| JEDEC Code | R-PDSO-G | R-PDSO-G | R-PDSO-G | R-PDSO-G | R-PDSO-G |
| Package QTY | 1000 | 1000 | 3000 | 1000 | 3000 |
| Carrier | LARGE T&R | LARGE T&R | LARGE T&R | LARGE T&R | LARGE T&R |
| Device Marking | SKJB | SKKB | SKKB | SKLB | SKLB |
| Width (mm) | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 |
| Length (mm) | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 |
| Thickness (mm) | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 |
| Pitch (mm) | .95 | .95 | .95 | .95 | .95 |
| Max Height (mm) | 1.45 | 1.45 | 1.45 | 1.45 | 1.45 |
| Mechanical Data | Download | Download | Download | Download | Download |
Parametrics
| Parameters / Models | LM1770SMF/NOPB | LM1770TMF/NOPB | LM1770TMFX/NOPB | LM1770UMF/NOPB | LM1770UMFX/NOPB |
|---|---|---|---|---|---|
| Control Mode | 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 |
| Iout(Max), A | 4 | 4 | 4 | 4 | 4 |
| Iq(Typ), mA | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Number of Phases | 1 | 1 | 1 | 1 | 1 |
| Operating Temperature Range, C | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 |
| Package Group | SOT-23 | SOT-23 | SOT-23 | SOT-23 | SOT-23 |
| Rating | Catalog | Catalog | Catalog | Catalog | Catalog |
| Regulated Outputs | 1 | 1 | 1 | 1 | 1 |
| Special Features | Light Load Efficiency | Light Load Efficiency | Light Load Efficiency | Light Load Efficiency | Light Load Efficiency |
| Switching Frequency(Max), kHz | 2000 | 2000 | 2000 | 2000 | 2000 |
| Switching Frequency(Min), kHz | 500 | 500 | 500 | 500 | 500 |
| Type | Controller | Controller | Controller | Controller | Controller |
| Vin(Max), V | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 |
| Vin(Min), V | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 |
| Vout(Max), V | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 |
| Vout(Min), V | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
Eco Plan
| LM1770SMF/NOPB | LM1770TMF/NOPB | LM1770TMFX/NOPB | LM1770UMF/NOPB | LM1770UMFX/NOPB | |
|---|---|---|---|---|---|
| RoHS | Compliant | Compliant | Compliant | Compliant | Compliant |
Application Notes
- AN-1414 LM1770 Design Reference (Rev. A)PDF, 226 Kb, Revision: A, File published: Apr 23, 2013
This application report presents several reference designs that can be used to implement the TexasInstruments LM1770 Synchronous Buck Controller in a wide variety of configurations. - Advanced Topics in Powering FPGAsPDF, 645 Kb, File published: Mar 22, 2007
- 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: LM1770 (5)
Manufacturer's Classification
- Semiconductors> Power Management> Non-isolated DC/DC Switching Regulator> Step-Down (Buck)> Buck Controller (External Switch)
