https://www.renesas.com/en/products/isl9110a
ISL9110A - 1.2A High Efficiency Buck-Boost Regulator | Renesas
Highly-integrated Buck-Boost switching regulator that accepts input voltages either above or below the regulated output voltage.
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https://www.renesas.com/en/products/isl91106a
ISL91106A - High Efficiency Buck-Boost Regulator with 4.2A Switches and Bypass Mode | Renesas
Renesas offers a wide portfolio of high performance buck, boost, buck or boost, and buck-boost integrated FET regulators.
https://www.analog.com/en/resources/design-notes/buckboost-chargepump-regulator-powers-white-leds-from-a-wide-16v-to-55v-input.html
Buck/Boost Charge-Pump Regulator Powers White LEDs from a Wide 1.6V to 5.5V Input | Analog Devices
How to use the MAX1759 step-up/step-down charge pump to power white LEDs with constant current in low voltage applications.
https://www.renesas.com/en/products/isl78200/part-details/isl78200avez
ISL78200AVEZ 2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck...
Order ISL78200AVEZ, 2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter