LM34936 Datasheet | Texas Instruments

Features - Single inductor buck-boost controller for step-up/ step-down DC/DC conversion - Wide VIN: 4.2 V (2.5 V with bias) to 30 V (42-V maximum) - Flexible VOUT: 0.8 V to 30 V - VOUT short protection - High efficiency buck-boost transition - Adjustable switching frequency - Optional frequency sync and dithering - Integrated 2-A MOSFET gate drivers - Cycle-by-cycle current limit and optional hiccup - Optional input or output average current limiting - Programmable lnput UVLO and soft start - Power good and output overvoltage protection - Available in QFN-28 package - Create a custom design using the LM34936 with the WEBENCH Power Designer 2 Applications - Industrial PC power supplies - USB power delivery - Battery-powered systems - LED Lighting 3 Description The LM34936 is a synchronous four-switch buckboost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM34936 operates over a wide input voltage range of 4.2 V to 30 V (42-V absolute maximum) to support a variety of applications. The LM34936 employs current-mode control both in buck and boost modes of operation for superior load and line regulation. The switching frequency is programmed by an external resistor and can be synchronized to an external clock signal. The device also features a programmable soft-start function and offers protection features including cycleby-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. In addition, the LM34936 features optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions. Device Information ORDER NUMBER PACKAGE(1) BODY SIZE LM34936RHF QFN-28 4.0 mm x 5.0 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Enable Power Good EN/UVLO PGOOD SS SLOPE RT/SYNC P AGND PGND VCC VISNS...