Texas Instruments LM5148-Q1

Description

The LM5148-Q1 is a 80-V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM5148-Q1 can be set up in idual-phase mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed.The LM5148-Q1 has a unique EMI reduction feature known as dual random spread spectrum (DRSS). Combining low-frequency triangular and high-frequency random modulations mitigates EMI disturbances across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.Additional features of the LM5148-Q1 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.The LM5148-Q1 controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package with wettable flank pins to facilitate optical inspection during manufacturing.

Features

• AEC-Q100 qualified for automotive applications:
• Device temperature grade 1: –40°C to +125°C ambient operating temperature
• Functional Safety-Capable
• Documentation available to aid functional safety system design
• Integrated EMI mitigation
• Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands
• Optimized for CISPR 25 Class 5 requirements
• Versatile synchronous buck DC/DC controller
• Wide input voltage range of 3.5 V to 80 V
• 1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable output from 0.8 V to 55 V
• 150°C maximum junction temperature
• Lossless DCR or shunt current sensing
• Shutdown mode current of 2.3 µA
• No-load sleep current of 9.5 µA
• Internal soft-start ramp of 3 ms
• Stackable up to two phases
• Internal bootstrap diode
• Switching frequency from 100 kHz to 2.2 MHz
• SYNC in and SYNC out capability
• Selectable PFM or FPWM modes
• Inherent protection features for robust design
• Internal hiccup mode overcurrent protection
• ENABLE and PGOOD functions
• VCC, VDDA, and gate-drive UVLO protection
• Internal or external loop compensation
• Thermal shutdown protection with hysteresis
• Create a custom design using the LM5148-Q1 with WEBENCH Power Designer

Typical applications

• Infotainment and clusters, Automotive electronic systems, Body electronics, Advanced driver assistance systems (ADAS)

More information

• Datasheet
• IC product information