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The LM5177DCPR is a four-switch buck/boost controller. The device provides a stable output voltage whether the input voltage is above, equal to, or below the regulated output voltage. In power safe mode, the device has low quiescent current for high efficiency at low output load conditions. The LM5177 operates at a fixed switching frequency that can be set via the RT or SYNC pin. The switching frequency remains constant during buck, boost, and buck/boost operation. An integrated optional average current monitor helps monitor and limit the input and output currents of the LM5177. This feature also supports the use of constant-current (CC) and constant-voltage (CV) modes for charging backup power components such as batteries or capacitors.

Features

- Wide input voltage range (3.5V to 60V, with an absolute maximum of 85V)

- 2.8V minimum for V(BIAS) > 3.5V

- Output voltage range of 3.3V to 60V

- Low shutdown IQ (3μA)

- Low operating IQ (60μA)

- 3% reverse current limit accuracy for precise charging current

- Average input and output current monitor or limiter

- Dynamic output voltage tracking for PWM or analogue input signals

- Optional Power Save Mode (PSM) for high light load efficiency

- Two integrated high-voltage power supply LDOs with automatic selection support

- 2A peak current logic level gate driver

- Integrated bootstrap diode

- Bootstrap overvoltage and undervoltage protection

- Fixed frequency in all operating modes (boost, buck/boost, buck)

- Optional forced PWM mode

- Switching frequency up to 600kHz for small solution and component size

- External clock synchronisation

- Optional spread spectrum operation

- Adjustable undervoltage protection

- Intermittent overcurrent and short circuit protection

Applications

- Non-isolated DC/DC power supplies (commercial DC/DC, remote radio units, motor drive control)

- Backup power systems (battery backup, fire safety)

- Industrial PCs (single board computers)

- Medical PSUs (oxygen generators)

- Power over Ethernet (routers)

- Solar power (solar charge controllers)

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