0
ACTIVE
Rating |
Catalog |
Iout (max) (A) |
6 |
Vin (max) (V) |
5.5 |
Vin (min) (V) |
2.8 |
Vout (max) (V) |
4.5 |
Vout (min) (V) |
0.8 |
Control mode |
Constant on-time (COT) |
Features |
Enable pin |
Duty cycle (max) (%) |
98 |
Iq (typ) (A) |
0.0004 |
Number of phases |
1 |
Operating temperature range (°C) |
-40 to 125 |
VSSOP (DGK)-8-14.7 mm² 3 x 4.9
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.
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