Calculation tool
SNVR519 — LM5177 BuckBoost Quickstart Calculator Tool
LM5177 BuckBoost Quickstart Calculator Tool
LM5177
60-V wide VIN synchronous 4-switch buck-boost controller with bidirectional operation
Data sheet
LM5177
- Wide input range from 3.5V to 60V (85V absolute maximum)
- Minimum 2.8V when V(BIAS) > 3.5V
- Output voltage from 3.3V to 60V
- Low shutdown IQ of 3µA
- Low operating IQ of 60µA
- 3% reverse current limit accuracy for precise charging currents
- Average input and output current monitor or limiter
- Dynamic output voltage tracking for PWM or analog input signals
- Power save mode (PSM) selectable for high light load efficiency
- Two integrated high-voltage supply LDOs with automatic selection
- 2A peak current logic level gate driver
- Integrated bootstrap diode
- Bootstrap overvoltage and undervoltage protection
- Fixed frequency across all operating modes (boost, buck-boost, buck)
- Forced PWM mode selectable
- Switching up to 600kHz for small solution and component size
- External clock synchronization
- Spread spectrum operation selectable
- Adjustable undervoltage protection
- Hiccup overcurrent and short protection
The LM5177 is a four switch buck-boost controller. The device provides a regulated output voltage if the input voltage is higher, equal, or lower than the adjusted output voltage. In power save mode, the device supports high efficiency with low output loads due to its low quiescence currents. The LM5177 runs at a fixed switching frequency, which can be set through the RT or SYNC pin. The switching frequency remains the same during buck, boost, and buck-boost operation. The integrated and optional average current monitor can help monitor and limit input and output current of the LM5177. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).
Technical documentation
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Evaluation board
LM5177EVM-HP — LM5177 evaluation module with four switch buck-boost controller
The LM5177EVM-HP demonstrates a flexible high power buck-boost design using the LM5177 wide-vin buck-boost controller. The evaluation module is configured to operate from input voltage range of 4.2 V to 36 V and provide a regulated 16-V output with up to 9.4 A of load current.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (DCP) | 38 | Ultra Librarian |
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