The LM5158x is a wide input range, non-synchronous boost converter that uses peak-current-mode control. The device can be used in boost, SEPIC, and flyback topologies.

The device can start up with a minimum of 3.2 V. It can operate with input supply voltage as low as 1.5 V if the BIAS pin is greater than 3.2 V. The internal VCC regulator also supports BIAS pin operation up to 60 V (65-V absolute maximum). The switching frequency is dynamically programmable from 100 kHz to 2.2 MHz with an external resistor. Switching at 2.2 MHz minimizes AM band interference and allows for a small solution size and fast transient response. The device provides an optional dual random spread spectrum to help reduce the EMI over a wide frequency span.

The device features an accurate current limit over the input voltage range. Low operating current and pulse skipping operation improve efficiency at light loads.

The device also has built-in protection features such as overvoltage protection, line UVLO, and thermal shutdown. Selectable hiccup mode overload protection protects the converter during prolonged current limit conditions. Additional features include the following:

• Low shutdown I_Q
• Programmable soft start
• Precision reference
• Power-good indicator
• External clock synchronization