GENERAL DESCRIPTION

The ADP5140 integrates four high performance, synchronous, step-down buck regulators (BUCK1 to BUCK4), one boost regulator, and seven low noise, low dropout (LDO) regulators (LDO1 to LDO7). The buck regulators support input voltages from 2.7 V to 5.5 V and provide output currents from 2.5 A to 3 A. The boost regulator provides a fixed 5 V output and provides a 400 mA load current. The seven LDOs provide a clean output voltage for the system. LDO5 provides an ultralow noise output that can be used to power noise sensitive loads.

The ADP5140 runs in a fixed 2.2 MHz switching frequency (fSW) or can synchronize to an external clock from its 1.9 MHz to 2.4 MHz synchronization range, which is outside of the amplitude modulation (AM) band. The four buck regulators run at 90° out of phase to reduce the input ripple current and the input capacitor size, which lowers the system electromagnetic interference (EMI).

All regulators integrate internal compensation to simplify the design. The internal soft start circuitry and power-up sequencing reduce the input inrush current.

Each voltage rail is monitored internally and any fault event is reported to the system through the RESET, FAULT, and STATUS pins. Two window watchdogs (WD0 and WD1) and one question answer (QA) watchdog monitor the processor or other devices in the system to ensure that any software or hardware errors are detected. The ADP5140 integrates a serial peripheral interface (SPI) for system control and diagnostics.

Additional protection includes current-limit protection, overvoltage protection, undervoltage protection, and thermal shutdown (TSD).

The ADP5140 operates over a junction temperature range of −40°C to +150°C and is available in a 56-terminal, land grid array (LGA).

FEATURES

Buck regulators

BUCK1, 2.5 A maximum continuous output current range with DVS

BUCK2, 2.5 A maximum continuous output current range with adjustable output voltage

BUCK3, 3 A maximum continuous output current range with adjustable output voltage

BUCK4, 3 A maximum continuous output current range with low noise output

Boost regulator: fixed 5 V output, 400 mA output current range

Seven LDO regulators with low noise output

LDO1: 300 mA

LDO2: 2.3 A

LDO3: 1.4 A

LDO4: 1.2 A

LDO5: 500 mA

LDO6: 50 mA

LDO7: 400 mA

2.2 MHz (typical) switching frequency

Synchronization input or output

Out of phase between buck regulators

Integrated soft start and compensation for all regulators

Overcurrent and thermal protection for all power rails

2 window voltage monitors

2 window watchdogs with pulse detection

One QA watchdog

Wake-up input

SPI for control and diagnostics

RESET, FAULT, and STATUS outputs

56-terminal LGA

AEC-Q100 qualified for automotive applications

APPLICATIONS

Advanced driver assistance (ADAS)

Automotive electronics

Infotainment system

Industrial and instrumentation