Low-Voltage Synchronous Buck Controller with Precision Enable and No External Compensation
Product details
Parameters
Package | Pins | Size
Features
- 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
Description
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.
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | LM1771 Low-Voltage Synchronous Buck Controller With Precision Enable and No External Compensation datasheet (Rev. D) | Jan. 08, 2016 |
| Technical articles | How to implement voltage monitoring | Jul. 22, 2015 | |
| User guide | AN-1477 LM1771 Evaluation Board (Rev. B) | Apr. 23, 2013 | |
| Application note | Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) | Apr. 23, 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
LM1771 Low-Voltage Synchronous Buck Controller with Precision Enable and No External Compensation
Features
- Input voltage range of 2.8V to 5.5V
- 0.8V reference voltage
- Precision enable
- No compensation required
- Constant frequency across input range
- Low quiescent current of 400 mA
- Internal soft-start
- Short circuit protection
- Tiny LLP-6 package and MSOP-8 package
Applications
- Simple to design, High-Efficiency Step-Down (...)
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| VSSOP (DGK) | 8 | View options |
| WSON (NGG) | 6 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Support & training
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