The LM34936 from Texas Instruments is a synchronous four-switch buck-boost 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 4.2V to 30V (42V 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.
Target applications include; industrial PC power supplies, USB power delivery, battery-powered systems, LED lighting and similar systems.
The device also features a programmable soft-start function and offers protection features including cycle-by-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.
Summary of features:
- Single-inductor buck-boost controller for step-up/step-down dc-dc conversion
- Wide VIN: 4.2 V (2.5V with bias) to 30 V (42V maximum)
- Flexible VOUT: 0.8V to 30V
- 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 input UVLO and soft-start
- Power good and output overvoltage protection
- Available in QFN-28 package