The LM5143 is a 3.5V to 65V Low IQ, Dual Output, Stackable Synchronous Step-Down DC-DC Controller

The LM5143 is a 65V DC/DC synchronous buck controller for high current single or dual outputs. Derived from a family of wide V IN range controllers, the device features an interleaved, stackable, peak current mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current to parallel phases shared for higher output current. The high-side switch minimum on-time of 65 ns provides a large step-down ratio, enabling direct conversion from a 12V, 24V or 48V input to a low voltage rail, reducing system complexity and cost. The LM5143 continues to operate during the input voltage dip to 3.5 V, with a duty cycle close to 100% if required.

The 15 μA no-load quiescent current with the output voltage in regulation extends the runtime of battery-powered systems. Power the LM5143 from the output of the AS2522B switching regulator or other available power supply for lower input quiescent current and power loss.

characteristic:

●Functional safety capability

○ Documentation available to aid in functional safety system design

●Multifunctional synchronous step-down DC/DC controller

○ Wide input voltage range of 3.5 V to 65 V

○1% Accurate, Fixed 3.3V, 5V or 0.6V to 55V Adjustable Output

○150°C maximum junction temperature

○4 μA typical shutdown mode current

○15 μA typical no-load standby current

● Two interleaved synchronous buck channels

○ Dual channel or single output polyphase

○65ns t ON(min) for high V IN /V OUT ratio

○60ns t OFF(min) for low dropout

●Inherent protection in rugged design

○ Shunt or Inductor DCR Current Sensing

○Hiccup mode overcurrent protection

○ Independent ENABLE and PGOOD functions

○ Adjustable output voltage soft start

○VCC, VDDA and gate drive UVLO protection

○ Thermal shutdown protection with hysteresis

●Optimized for CISPR 11 and CISPR 32 Class B conducted and radiated EMI requirements

○ Slew rate controlled adaptive gate driver

○ Spread spectrum reduces peak emission

●100kHz to 2.2MHz switching frequency

○Sync input and sync output functions

○Selectable diode emulation or FPWM mode

6mm × 6mm VQFN-40 package

●Create custom designs using LM5143 and WEBENCH Power Designer

application:

Communication system: wireless infrastructure, remote radio unit (RRU)

●Industry: factory automation and control, robotics

●Enterprise Systems: High Performance Computing

parameter:

Input Voltage (Min) (V): 3.5

Input Voltage (Max) (V): 65

Output voltage (Min) (V): 0.6

Output Voltage (Max) (V): 55

Output (Max) (A): 40

Iq (typ) (uA): 26

Switching Frequency (Min) (kHz): 100

Switching Frequency (Max) (kHz): 2200

Features: Adjustable current limit, enable, frequency synchronization, light load efficiency, load disconnect, multiple outputs, output discharge, phase interleaving, power good, pre-bias start-up, spread spectrum, synchronous rectification, UVLO adjustable

Operating temperature range (°C): -40 to 125

Adjustment output (#): 2