LTM4719: 42V dual-input, low-noise 150mA step-down µModule® regulator with I2C battery health monitor

The LTM4719 supports seamless transition between two separate input power sources if one of the inputs is lost. The automatic switchover eliminates the need for holdup capacitors and minimizes disturbances on the output rail. The 18.5µA Burst Mode operation quiescent current makes the LTM4719 compatible with many applications.
 
The LTM4719 has a built-in precision coulomb counter (Q) accessible through an I²C interface. A discharge alarm threshold can be programmed. When the threshold is reached, an interrupt signal is generated at the IRQ pin. Battery voltage (V), battery impedance (Z), and temperature (T) are accessible through I²C. Fault protection features include input undervoltage lockout (UVLO), power good (PG), current limit, and overtemperature (OV) protection.

• Seamless and automatic transition between two input power sources
• Integrated battery health monitor
• Wide voltage range for dual inputs: 2.4V to 42V
• Battery health monitor input voltage: 1.8V to 5.5V
• Adjustable output range: 1V to 4.2V
• Up to 150mA continuous output current
• Integrated low-dropout linear regulator: 195mV at 150mA load for low output noise
• 200kHz to 2.2MHz switching frequency
• Synchronization to an external clock
• Current mode control with 60ns minimum on-time
• Burst Mode® operation, IQ = 18.5μA
• Programmable input UVLO thresholds and discharge alarm with interrupt output
• Input valid, priority channel, and PG indicators
• Available in a compact 64-pin BGA, 7mm × 7mm × 1.85mm package

• Portable battery-powered devices
• Radio, healthcare, and industrial test equipment
• Uninterruptible power supplies