1 Features

? Compliant to JEDEC PMIC5020 for DDR5

MRDIMM and RDIMM

? 4 Buck regulators

– SWA (1.1V) 8.5A DC/10A Pk

– SWB (1.1V) 8.5A DC/10A Pk

– SWC (1.1V) 10A DC/11.5A Pk

– SWD (1.8V) 3A DC/3.5A Pk

? Single or dual phase for SWA and SWB

? 2 LDO: 1.8V / 25mA and 1.0V / 20mA

? VIN_Bulk (4.25V to 15V) and VIN_Mgmt (3.0V to

3.6V) input supplies

? Automatic switchover from VIN_Mgmt to VIN_Bulk

? Overvoltage, under voltage, over current,

temperature warning and temperature shutdown

? Error injection capability

? DIMM specific registers for customization

(EEPROM)

? Persistent error log registers

? Programmable switching frequency: 500kHz to

1.375MHz

? Power good pin (CAMP) and General status

interrupt pin (GSI_n)

? I2C and I3C Bus interface for telemetry of voltage,

current, power, temperature, and fault conditions

? Enable with I2C/I3C, VR_EN pin or Auto power on

? 5mm × 5mm, 35-Pin, QFN PowerPad? package

2 Applications

? DDR5 MRDIMM and RDIMM Power Supply for

Server

? DDR5 CXL module power supply

3 Description

The TPS53840 is a D-CAP+? mode integrated stepdown

converter for DDR5 on-DIMM power supply

in servers fully compliant to Jedec PMIC5020. It

provides VDD, VDDQ and VPP voltages to the

DRAM chips on the DIMM module with configurable

current capability. SWA and SWB can be configured

to be either a dual phase output (20A) or 2 single

outputs (10A each), while SWC is a single phase rail

capable of 11.5A. The converter also employs internal

compensation for ease of use and reduce external

components.

The converter provides a full set of telemetry,

including input voltage, output voltage, output

current and output power. Protection features include

input and output over voltage, input and output

undervoltage, buck overcurrent limit, and die over

temperature.

TPS53840 with its significantly higher current

capability than JEDEC PMIC5000, and configurable

Auto power on or VR_EN pin, is suitable for CXL

memory module applications.

The TPS53840 is packaged in a thermally-enhanced

35-pin QFN and operates from -40°C to +105°C.