Monolithic Power Systems Inc. MP2316GD-P

Overview

MP2316GD-P from Monolithic Power Systems is a fully-integrated, synchronous step-down DC/DC converter with 4V–19V input range, 3A continuous output current, 40µA quiescent current, and Constant On-Time (COT) control architecture. It delivers tight regulation and fast transient response in battery-powered SSDs, tablets, and portable gaming devices using an internal 90mΩ/30mΩ HS/LS MOSFET pair and power-good indicator.

For engineers reviewing the MP2316GD-P datasheet, MP2316GD-P pinout, MP2316GD-P application, or MP2316GD-P equivalent, key selection criteria include light-load PFM/PWM mode selectability, programmable soft-start, thermal shutdown at 150°C, hiccup-mode short-circuit protection, and QFN-14 (2mm×3mm) package compatibility with high-density PCB layouts.

Technical Context

The MP2316GD-P implements Constant On-Time (COT) control with feed-forward input voltage compensation, enabling stable operation across wide VIN/VOUT ratios and eliminating external loop compensation components. Its dual-mode FREQ/MODE pin supports either forced PWM (fixed frequency) or auto PFM/PWM (efficiency-optimized light-load) operation via resistor-to-VIN or resistor-to-GND configuration.

Internal ramp compensation (CR pin), programmable soft-start (SS pin), and bootstrap-driven high-side gate drive (BST pin) enable robust startup into pre-biased loads and stable regulation with low-ESR ceramic output capacitors. Protection logic includes cycle-by-cycle over-current detection, under-voltage lockout (3.7V rising threshold), and non-latch thermal shutdown with 20°C hysteresis.

Key Specifications

Pinout & Package

MP2316GD-P is housed in a thermally enhanced QFN-14 package measuring 2mm × 3mm with exposed thermal pad (EP). The package supports high-power density layout with GND pins (1,12) and VIN (3,14) placed for low-inductance input decoupling, and SW (2,13) routed with wide copper traces.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with RT6220AGQW and TPS543320RNVR, MP2316GD-P uniquely balances ultra-low quiescent current (40µA), programmable PFM/PWM operation, and compact 2×3mm footprint-making it optimal for space- and energy-constrained portable electronics where analog simplicity and long battery life are primary design goals.

Availability

MP2316GD-P is available at Aetrix Electronics and suitable for tablet PCs, solid-state drives, and battery-operated medical sensors requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle support.

Supply support for MP2316GD-P 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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2316GD-P belongs to MPS's high-efficiency, low-IQ DC/DC converter product line, engineered specifically for portable and battery-centric applications demanding extended runtime, fast transient response, and minimal external component count.

FAQ

What is the maximum supported switching frequency for MP2316GD-P?

The MP2316GD-P achieves a maximum practical switching frequency of approximately 1.1MHz under typical conditions (VIN=12V, VOUT=1.2V), constrained by its 90ns minimum on-time and 150ns minimum off-time. Frequency is set via resistor on the FREQ/MODE pin and varies slightly with input voltage and load due to COT architecture.

Can MP2316GD-P start up into a pre-biased output?

Yes, MP2316GD-P supports monotonic pre-bias startup. When the output is already charged, the internal BST capacitor refreshes and the soft-start capacitor charges in parallel with the existing VOUT, preventing reverse current flow and ensuring controlled ramp-up without output collapse or overshoot.

How does the power-good (PG) pin behave during enable/disable transitions?

The PG pin is actively pulled low when EN is low or VIN drops below 0.8V (typical), regardless of output voltage. If pulled up to VCC, PG de-asserts cleanly during shutdown; if pulled up to an external rail, PG remains high until that rail collapses-so VCC-referenced pull-up is recommended for reliable sequencing.

What is the purpose of the CR pin and when is it required?

The CR pin adds external ramp compensation to stabilize CCM operation with low-ESR ceramic output capacitors. It is required when using small-ESR caps (e.g., X5R/X7R ceramics); omission causes subharmonic oscillation. Recommended Cr values range from 56pF to 150pF depending on VOUT and switching frequency.

Does MP2316GD-P support output voltages below 0.6V?

No. The internal feedback reference is fixed at 600mV ±6mV, and the datasheet specifies VOUT adjustability from 0.6V upward. Attempting to set lower outputs violates the FB pin's operating range and results in regulation failure or instability.

How is thermal performance affected by PCB layout?

Thermal resistance θ_JA drops from 70°C/W (4-layer JEDEC standard) to ~45°C/W with 2oz copper, 4 thermal vias under the EP pad, and 1cm² copper pour-enabling full 3A output at +85°C ambient. Poor layout (e.g., no EP connection or insufficient vias) can raise junction temperature by >40°C at full load.

What happens during short-circuit events?

Upon short-circuit detection, MP2316GD-P enters hiccup mode: it disables switching, discharges the SS capacitor, waits ~10ms, then attempts soft-start again. This cycle repeats until the fault clears, limiting average power dissipation to <300mW and preventing thermal damage to the IC or PCB.