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Texas Instruments LM3489MM | Demoboard USB-C-PD-DUO-EVM
Hysteretic PFET Buck Controller with Enable Pin
Details
| Topologie | Abwärtswandler |
| Eingangsspannung | 4.5-35 V |
| Ausgang 1 | 35 V |
Beschreibung
The LM3489 device is a high-efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, cost-effective, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control loop stability concerns using a wide variety of external components. The PFET architecture also allows for low component count as well as ultra-low dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple. A dedicated enable pin provides a shutdown mode drawing only 7 µA. Leaving the enable pin unconnected defaults to on.Current limit protection can be implemented by measuring the voltage across the PFET’s RDS(ON), thus eliminating the need for a sense resistor. A sense resistor may be used to improve current limit accuracy if desired. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents.
Eigenschaften
- Qualified for Automotive Parts
- AEC-Q100 Qualified With the Following Results:
- Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
- Device HBM ESD Classification Level 2
- Device CDM ESD Classification Level C5
- Easy-to-Use Control Methodology
- No Control Loop Compensation Required
- Wide 4.5-V to 35-V Input Range
- 1.239 V to VIN Adjustable Output Range
- High Efficiency: 93%
- ±1.3% (±2% Over Temperature) Internal Reference
- 100% Duty Cycle Operation
- Maximum Operation Frequency > 1 MHz
- Current Limit Protection
- Dedicated Enable Pin (on if Unconnected)
- Shutdown Mode Draws Only 7-µA Supply Current
- 8-Pin VSSOP Package
Typische Anwendungen
- Battery-Powered Portable Applications, Distributed Power Systems, Always-On Power
- Automotive
- High-Power LED Drivers
- Set-Top Boxes, DSL or Cable Modems, PC/IA, Auto PCs, TFT Monitors
Weiterführende Informationen
Artikeldaten
Artikel Nr. | Datenblatt | Simulation | Downloads | Status | Produktserie | λDom typ.(nm) | Emittierte Farbe | λPeak typ.(nm) | IV typ.(mcd) | VF typ.(V) | Chiptechnologie | 2θ50% typ.(°) | C | Tol. C | VR(V (DC)) | Bauform | Betriebstemperatur | DF(%) | RISO | Keramiktyp | L(mm) | B(mm) | Fl(mm) | Verpackung | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Montageart | Interface typ | Typ | Gender | Pins | Leiterplattendicke(mm) | IR(mA) | Arbeitsspannung(V (DC)) | Farbe | H(mm) | Betätigungskraft(g) | Elektrische Lebensdauer(Cycles) | Actuator-Farbe | Waschbar | Dampfphasenprozess | Muster | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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