LM1771SSD/NOPB
ActiveLOW-VOLTAGE SYNCHRONOUS BUCK CONTROLLER WITH PRECISION ENABLE AND NO EXTERNAL COMPENSATION
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LM1771SSD/NOPB
ActiveLOW-VOLTAGE SYNCHRONOUS BUCK CONTROLLER WITH PRECISION ENABLE AND NO EXTERNAL COMPENSATION
Technical Specifications
Parameters and characteristics for this part
| Specification | LM1771SSD/NOPB |
|---|---|
| Clock Sync | False |
| Control Features | Enable |
| Frequency - Switching [Max] | 1 MHz |
| Frequency - Switching [Min] | 100 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 125 ¯C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Supplier Device Package | 6-WSON (3x3) |
| Synchronous Rectifier | True |
| Topology | Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 5.5 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 2.8 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 2.16 | |
| 10 | $ 1.94 | |||
| 25 | $ 1.83 | |||
| 100 | $ 1.56 | |||
| 250 | $ 1.47 | |||
| 500 | $ 1.28 | |||
| Tape & Reel (TR) | 1000 | $ 1.06 | ||
| 2000 | $ 0.99 | |||
| 5000 | $ 0.95 | |||
| 10000 | $ 0.92 | |||
| Texas Instruments | SMALL T&R | 1 | $ 1.63 | |
| 100 | $ 1.34 | |||
| 250 | $ 0.96 | |||
| 1000 | $ 0.73 | |||
Description
General part information
LM1771 Series
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. 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.
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. 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%.
Documents
Technical documentation and resources
