TI LM5156HPWPR

The LM5156xH (LM5156H and LM51561H) devices are non-synchronous boost controllers with peak current mode control and wide input voltage range. These devices support boost, SEPIC, and flyback topologies.

• 3.5V to 60V operating voltage range (absolute maximum 65V) 2.97V to 16V when BIAS = VCC Minimum boost supply voltage of 1.5V when BIAS voltage ≥ 3.5V Input transient protection up to 65V Minimum battery drain Low shutdown current (IQ ≤ 2.6μA) Low operating current (IQ ≤ 490μA)

If the BIAS pin is connected to the VCC pin, the device can start up from a single-cell battery (minimum voltage 2.97V). If the BIAS pin voltage is above 3.5V, the device can operate with an input supply voltage as low as 1.5V.

Small solution size, low cost

• Maximum switching frequency of 2.2MHz
• Integrated error amplifier supports primary-side regulation (flyback) without optocoupler

Optional dual random spread spectrum for EMI mitigation Low power consumption, high efficiency

• 100mV ± 7% accurate current limit threshold
• Robust 1.5A peak standard MOSFET driver
• External VCC supply supported

Avoids AM band interference and crosstalk Optional clock synchronization Dynamically programmable switching frequency from 100kHz to 2.2MHz

Integrated protection features

• Constant peak current limit across input voltage range Optional hiccup mode overload protection Programmable line UVLO OVP protection
• Thermal shutdown protection Accurate precision feedback reference Programmable additional slope compensation Adjustable soft-start PGOOD indicator 14-pin HTSSOP package (5.0mm×4.4mm)

The internal VCC regulator also supports BIAS pin operation at voltages up to 60V (absolute maximum 65V). The switching frequency can be dynamically programmed via an external resistor over a range of 100kHz to 2.2MHz. The 2.2MHz switching frequency minimizes AM band interference and enables small solution size and fast transient response. To reduce power supply EMI, the device offers optional dual random spread spectrum, which reduces EMI over a wide frequency range.

The device features a 1.5A standard MOSFET driver and a low current limit threshold of 100mV. The device also supports an external VCC supply for improved efficiency. Low current operation and pulse-skip mode improve efficiency under light load conditions.

The device incorporates built-in protection features such as cycle-by-cycle current limiting, OVP, line UVLO, and thermal shutdown. The LM51561H device option includes hiccup mode overload protection. Additional features include: low shutdown IQ, programmable soft-start, programmable slope compensation, precision reference, power-good indicator, and external clock synchronization.

• Functional safety support
• Documentation to aid functional safety system design
• Suited for battery applications with wide input operating range

• Multi-output flyback applications without optocoupler
• LED bias power supply
• Wide-input boost, SEPIC, and flyback power modules
• Portable speaker applications
• Flyback POE power supply applications
• Battery-powered boost, SEPIC, and flyback applications