Monolithic Power Systems Inc. MP5512GV-Z

Overview

MP5512GV-Z from Monolithic Power Systems is a high-efficiency, integrated energy storage and management unit for SSD and HDD power-backup systems. It delivers 4.5A input current limiting, programmable 40V storage voltage, and bidirectional buck/boost energy transfer in a 28-pin QFN (4mm×5mm) package. Its dv/dt-controlled bus start-up, hot-swap MOSFET (14mΩ), and programmable release timing enable reliable data-hold-up during input outages.

For engineers reviewing the MP5512GV-Z datasheet, MP5512GV-Z pinout, MP5512GV-Z application, or MP5512GV-Z equivalent, key selection criteria include its ±3% input-current limit accuracy at 2A, dual-programmable voltage thresholds (VSTRG and VRTEST), thermal shutdown at 150°C, and support for 100% duty-cycle buck release to fully deplete stored energy.

Technical Context

The MP5512GV-Z implements a patented bi-directional buck/boost architecture: boost mode charges the STRG capacitor to up to 40V using an internal 140mΩ HS and 110mΩ LS switch pair; buck mode discharges stored energy to VB with fixed-frequency constant-on-time (COT) control and 5A peak-current limiting. Its charge-pump-driven hot-swap FET enables controlled inrush with programmable dv/dt via DVDT capacitor.

It integrates three independent voltage monitoring paths: PFI (power-failure indicator) triggers at 1.02×VDET-REF, WARN provides early VIN droop warning at 1.08×VDET-REF, and PGB asserts power-good when FBB exceeds 0.95×VFBB-REF. All indicators are open-drain with 2mA sink capability and <0.3V low-level output.

Key Specifications

Pinout & Package

MP5512GV-Z is housed in a thermally enhanced 28-pin QFN package (4mm × 5mm, 0.5mm pitch) with exposed thermal pad. The package supports high-power dissipation (θ_JA = 38°C/W) and requires PCB land pattern per MPS AN-107.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar energy storage and management applications.

Compared with TPS43060RTER and MAX20419ATPA/VY+, MP5512GV-Z uniquely integrates complete energy storage, release, monitoring, and hot-swap control in one QFN package-reducing total solution size by >60% and eliminating 12+ external components required by controller-based alternatives.

Availability

MP5512GV-Z is available at Aetrix Electronics and suitable for solid-state drive data backup, hard-disk drive write-cache protection, and industrial RAID controller hold-up requiring stable component supply across extended product lifecycles.

Supply support for MP5512GV-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with over 20 years of leadership in DC-DC conversion and energy management solutions.

The MP5512 belongs to MPS's Energy Storage and Management Unit (ESMU) product line, engineered specifically to replace discrete hold-up capacitor + controller designs in storage subsystems with single-chip reliability and programmability.

FAQ

What is the maximum allowable storage capacitor value for MP5512GV-Z?

The MP5512GV-Z does not impose an upper limit on STRG capacitance, but practical hold-up time scales linearly with capacitor value. For optimal transient response and loop stability, MPS recommends 100μF to 1000μF tantalum or polymer capacitors. Larger values require verification of inrush current during boost recharge and thermal performance under full-load release.

Can ENCH be used to disable storage charging without affecting buck release?

Yes. Pulling ENCH low disables only the boost-mode charging circuit; the buck-release function remains fully operational during input failure. This allows firmware to selectively suspend storage recharge (e.g., during thermal throttling) while preserving critical data-hold-up capability.

How is the input current limit set, and what tolerance applies?

The input current limit is set by a resistor from ILIM to AGND. Using the formula I_LIM = 17.2 / R_ILIM(kΩ) – 0.085, a typical 8.25kΩ resistor yields 2.0A. At 2A, the limit has ±3% tolerance over temperature (–40°C to +125°C), verified in production test.

Does MP5512GV-Z support automatic recharging after input recovery?

Yes. When VIN recovers above VB + 190mV and PFI goes high, the device automatically disables buck release, re-enables the hot-swap FET, and resumes boost charging of STRG after a 1.8ms delay - all without requiring EN or ENCH toggling.

What is the purpose of the RTEST pin, and how should it be configured?

RTEST provides a controlled discharge path for residual STRG voltage after shutdown. Connect a resistor (e.g., 10kΩ) from RTEST to STRG; this draws <500mA during discharge, preventing arcing when servicing the board. Leaving RTEST unconnected disables discharge and retains STRG voltage until natural leakage dissipates it.

Is the CST pin mandatory, and what capacitor value is recommended?

Yes. CST supplies gate drive for the internal hot-swap FET. A 10nF ceramic capacitor between CST and AGND is mandatory; values >47nF degrade start-up slew rate control and may cause ILIM threshold violation. Place it within 2mm of the pin with short, low-inductance traces.

How does the WARN pin differ from PFI in system-level response?

WARN asserts at 1.08×VDET-REF - 200μs before PFI triggers at 1.02×VDET-REF - providing early warning of impending input collapse. This enables firmware to initiate non-critical tasks (e.g., cache flush, log rotation) before committing to emergency save routines triggered by PFI.