Texas Instruments LM1771
The LM1771 device is an efficient synchronous buck switching controller with a precision enable requiring no external compensation. The constant ON-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space. The precision enable pin allows flexibility in sequencing multiple rails and setting UVLO.| Part No. | LM1771 |
|---|---|
| Datasheet | LM1771 Download |
| Manufacturer |  Texas Instruments |
| Description | Low-Voltage Synchronous Buck Controller |
| Buy | Stock & Price |
FEATURES
●1 Input Voltage Range of 2.8 V to 5.5 V● 0.8-V Reference Voltage
● Precision Enable
● No Compensation Required
● Constant Frequency Across Input Range
● Low Quiescent Current of 400 µA
● Internal Soft-Start
● Short Circuit Protection
● 6-Pin WSON Package and 8-Pin VSSOP Package 2
APPLICATIONS
● Simple-to-Design, High-Efficiency, Step-Down Switching Regulators● FPGAs, DSPs, and ASIC Power Supplies
● Set-Top Boxes
● Cable Modems
● Printers
● Digital Video Recorders
● Servers
● Graphic Cards 3
DESCRIPTION
The LM1771 also incorporates a unique input feedforward to maintain a constant frequency independent of the input voltage. The LM1771 is optimized for a low-voltage input range of 2.8 V to 5.5 V and can provide an adjustable output as low as 0.8 V. Driving an external high-side PFET and low-side NFET, it can provide efficiencies as high as 95%. Three versions of the LM1771 are available depending on the switching frequency desired for the application. Nominal switching frequencies are in the range of 100 kHz to 1000 kHz.
