STMicroelectronics LDH40

LDH40 is a high accuracy voltage regulator designed to be directly connected to a car battery in automotive applications, or a generic battery connected in industrial applications. Extended input voltage up to 40 V makes the device capable to support a load dump transient, typical in automotive systems. Ultra-low quiescent current at light load increases the battery operation lifetime in always-on-standby systems. The device is stabilized with a small ceramic capacitor on the input and output. An enable logic control function puts the LDH40 in shutdown mode allowing a total current consumption lower than 0.3 µA. Thermal protection is also included. The device is available in automotive grade in a very small footprint DFN package with wettable flank, allowing the maximum space saving in the PCB (printed circuit board) design and AOI (automated optical inspection).

Key features

• AEC-Q100 grade 1 qualified, output active discharge function
• Input voltage range from 3.3V to 40V
• Power good, logic-controlled electronic shutdown
• Internal current limit, thermal shutdown, 200mA guaranteed output current
• Dropout voltage is 700mV typical at (I_OUT = 200mA; V_OUT = 97% of V_OUT (NOM))
• Output voltage accuracy is +0.5% maximum at (T_J = 25°C)
• Output noise voltage is 100µV_RMS typ at (V_IN = 3V; V_OUT (NOM) = 1.2V; 10Hz to 100KHz, I_OUT = 1mA)
• Quiescent current during regulation is 2µA typical at (V_IN from 3.3V to 40V no load)
• Standby current is 0.3µA typical at (V_IN = 32V)
• Operating temperature range from -40°C to 150°C, DFN6 package

Applications

• EV powertrain
• Body control modules
• Always-on battery connected application
• Infotainment and instrument cluster
• ADAS

Available tools

STEVAL-A6986IV3:

Isobuck-boost converter with four selectable dual voltages

The STEVAL-A6986IV3 is an evaluation board based on ST A6986I. The A6986I is designed for isolated applications and normally implements an iso-buck architecture.

Data brief