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Texas Instruments LMR514x0 Synchronous Step-Down DC/DC Converters

Texas Instruments LMR514x0 Synchronous Step-Down DC/DC Converters are wide-V_IN, easy-to-use synchronous buck converters capable of driving up to 4A or 5A load current. With a wide input range of 4V to 36V, the device is suitable for various industrial applications for power conditioning from an unregulated source.

The LMR514x0 features an adjustable switching frequency from 200kHz to 1.1MHz with an external resistor, which provides the flexibility to optimize either efficiency or external component size. The device has a PFM version to realize high efficiency at light load and an FPWM version to achieve constant frequency and small output voltage ripple over the full load range. Soft-start and compensation circuits are implemented internally, which allows the device to be used with minimum external components.

The device has built-in protection features, such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation. The Texas Instruments LMR514x0 is available in the WSON-12 package.

Features

Configured for rugged industrial applications
- 4V to 36V wide input voltage range
- 4A (LMR51440) or 5A (LMR51450) continuous output current
- ±1.0% tolerance voltage reference at room temperature
- 75ns (typical) minimum switching-on time
- 25µA low quiescent current
- 200kHz to 1.1MHz adjustable frequency
- Frequency spread spectrum (PFM variant)
- Protection features
  - Precision enable input
  - Open-drain PGOOD
  - V_IN undervoltage lockout (UVLO)
  - Cycle-by-cycle current limiting
  - Short-circuit protection with hiccup mode
  - Thermal shutdown
- Low dropout mode operation
- –40°C to 150°C junction temperature range

Functional Safety-Capable
- Documentation available to aid functional safety system design
Small solution size and ease of use
- Integrated synchronous rectification
- Internal compensation for ease of use
- WSON-12 package
Various options in a pin-to-pin compatible package
- PFM and forced PWM (FPWM) options

Applications

Major appliances
PLC, DCS, and PAC

Test and measurement instrumentation
Power delivery

Texas Instruments LMR514x0 Synchronous Step-Down DC/DC Converters

Features

Applications

Functional Block Diagram

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