The LM5155DSSR device is a wide input range, non-synchronous boostcontroller that uses peak current mode control. The device can be used in boost, SEPIC, and flybacktopologies.
The LM5155DSSR device can start up from a 1-cell battery with a minimum of2.97 V if the BIAS pin is connected to the VCC pin. It can operate with the input supply voltage aslow as 1.5 V if the BIAS pin is greater than 3.5 V.
The internal VCC regulator also supports BIAS pin operation up to 45 V (50-V absolutemaximum). The switching frequencyis dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHzminimizes AM band interference and allows for a small solution size and fast transientresponse.
The device features a 1.5-A standard MOSFET driver and a low 100-mV current limitthreshold. The device also supports the use of an external VCC supply to improve efficiency. Lowoperating current and pulse-skipping operation improve efficiency at light loads.
The device has built-in protection features such as cycle-by-cycle current limit,overvoltage protection, line UVLO, and thermal shutdown. Hiccup mode overload protection isavailable in the LM51551 device option. Additional features include low shutdownIQ, programmable soft start, programmable slope compensation, precisionreference, power-good indicator, and external clock synchronization.
Feature
- Wide Input Operating Range forBattery Applications
- 3.5-V to 45-V Operating Range
- 2.97-V to 16-V When BIAS = VCC
- Minimum Boost Supply Voltage 1.5 V When BIAS ≥ 3.5 V
- Input Transient Protection up to 50 V
- Minimized Battery Drain
- Low Shutdown Current (IQ ≤ 2.6 μA )
- Low Operating Current ( IQ ≤ 480 μA )
- Small Solution Size and Low Cost
- Maximum Switching Frequency of 2.2 MHz
- 12-Pin WSON Package (3 mm × 2 mm)
- Integrated Error Amplifier Allows Primary-Side Regulation Without Optocoupler (Flyback)
- Minimized Undershoot During Cranking (Start-stop Application)
- Higher Efficiency With Low-Power Dissipation
- 100-mV ±7% Low Current Limit Threshold
- Strong 1.5-A Peak Standard MOSFET Driver
- Supports External VCC Supply
- Avoid AM Band Interference and Crosstalk
- Optional Clock Synchronization
- Dynamically Programmable Switching Frequency from 100 kHz to 2.2 MHz
- Integrated Protection Features
- Constant Peak Current Limiting Over Input Voltage
- Optional Hiccup Mode Short-Circuit Protection (see the Device Comparison Table)
- Programmable Line UVLO
- OVP Protection
- Thermal Shutdown
- Accurate ±1% Accuracy Feedback Reference
- Programmable Extra Slope Compensation
- Adjustable Soft Start
- PGOOD Indicator
- Create a Custom Design Using the LM5155 With the WEBENCH Power Designer
