Monolithic Power Systems Inc. MP6302DD-LF-Z

Overview

MP6302DD-LF-Z from Monolithic Power Systems is an energy storage and release control IC that manages backup power delivery during input voltage dropouts. It charges a storage capacitor from 4.2V–18V input, regulates storage voltage (programmable via FB1), monitors input voltage (via FB2), and dumps up to 2.5A from storage to VIN when input falls below user-set release threshold. Used in SSDs and HDDs for hold-up time extension.

For engineers reviewing the MP6302DD-LF-Z datasheet, MP6302DD-LF-Z pinout, MP6302DD-LF-Z application, or MP6302DD-LF-Z equivalent, this page provides verified functional identity, QFN10 package mapping, validated pin roles, programmable voltage thresholds, current-limiting behavior, and real-world timing performance data for power-fail response design.

Technical Context

The MP6302 operates in two distinct phases: pre-charge (250mA inrush-limited) followed by regulated boost charging to user-defined V_STORAGE; then transitions to controlled discharge mode when V_IN drops below V_RELEASE, maintaining regulated input voltage via internal 2.5A dump path. It uses dual feedback loops (FB1 for storage voltage, FB2 for release threshold) with hysteresis (50mV on FB1, 350mV UVLO on VIN).

It integrates open-drain power-good indicators (PGS for storage voltage readiness, PGIN for input availability), BST-driven charge pump for high-side gate drive, and thermal shutdown at 150°C with 30°C hysteresis. The device requires no external MOSFETs and supports stable operation with standard ceramic capacitors.

Key Specifications

Pinout & Package

MP6302DD-LF-Z is housed in a thermally enhanced 2mm × 3mm QFN10 package with exposed thermal pad. Pin 1 is marked by index area; recommended land pattern follows JEDEC MO-220.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61094 and LTC3350, MP6302DD-LF-Z delivers higher dump current (2.5A) in a minimal 2×3mm footprint without requiring external FETs, making it optimal for cost-sensitive, space-constrained SSD/HDD hold-up where discrete capacitor banks are used instead of supercapacitors.

Availability

MP6302DD-LF-Z is available at Aetrix Electronics and suitable for solid-state drives, hard disk drives, industrial PLC I/O modules, and medical imaging data buffers requiring stable component supply across automotive-qualified temperature ranges and long-life production programs.

Supply support for MP6302DD-LF-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, headquartered in California and serving global industrial, computing, and automotive markets since 1997.

The MP6302 belongs to MPS's energy management product line, designed specifically to extend hold-up time in storage-class devices by intelligently controlling discrete capacitor-based backup power delivery during input voltage transients.

FAQ

What is the maximum storage voltage the MP6302DD-LF-Z can regulate?

The MP6302DD-LF-Z supports storage voltage up to 32V, limited by its absolute maximum V_STRG rating of 32V. In practice, the programmable range is constrained by the 2×V_IN relationship and external resistor selection - e.g., with 12V input, typical storage targets are 8.5V, 12V, or 15V using standard resistor values from Table 1.

Can MP6302DD-LF-Z operate without a bootstrap capacitor on the BST pin?

No. The BST pin requires a series RC network connected to the DC/DC converter's switch node to generate the gate drive voltage for the internal high-side charge switch. Omitting this network disables regulated storage capacitor charging and causes startup failure per the functional block diagram and Figure 1 timing sequence.

How does the MP6302DD-LF-Z determine when to initiate energy release?

Release begins only after two conditions are met: (1) V_IN drops below the voltage set by the FB2 resistor divider (e.g., 4.2V), and (2) the storage voltage has already reached regulation (confirmed by PGS going high). This dual-condition logic prevents premature discharge and ensures sufficient stored energy before release.

Is the NC pin (Pin 6) electrically isolated or internally tied?

Pin 6 is explicitly designated "N/C" (No Connect) in the datasheet pin function table and must remain unconnected. It is not internally tied to any circuit node - connecting it risks undefined behavior or latch-up, as confirmed by the "The pin should not be connected" directive on page 7.

What is the minimum recommended storage capacitance for 20ms hold-up at 0.5A?

Using the formula C_STORAGE = (I_RELEASE × T_HOLD) / (V_STORAGE – V_RELEASE), with I=0.5A, T=20ms, V_STORAGE=8.5V, and V_RELEASE=4.2V, the required capacitance is ~2200μF. Ceramic or polymer capacitors rated ≥10V are recommended per application note section "Storage Capacitor Selection".

Does MP6302DD-LF-Z support automatic refresh of storage voltage during normal operation?

Yes. After initial charging, the MP6302 continuously monitors FB1 and executes auto-refresh cycles using hysteretic control: when storage voltage drops 25mV below target (V_{FB1_L}), it activates the charge path; when it rises 25mV above (V_{FB1_H}), charging stops. This maintains tight regulation without external intervention.