Monolithic Power Systems Inc. MP2153GTF-15-P

Overview

MP2153GTF-15-P from Monolithic Power Systems is a fixed-output, 1.5V, 3A synchronous step-down DC/DC converter in SOT563 package, featuring 25μA quiescent current, 1.1MHz switching frequency, and integrated 65mΩ/35mΩ MOSFETs. It operates from 2.5V–5.5V input and delivers precise 1.5V ±1% output for low-voltage logic rails in portable SSDs and battery-powered instrumentation.

For engineers reviewing the MP2153GTF-15-P datasheet, MP2153GTF-15-P pinout, MP2153GTF-15-P application, or MP2153GTF-15-P equivalent, key selection criteria include its ultra-low IQ for battery longevity, output discharge during shutdown, COT control for fast load transient response, and guaranteed 1.5V output accuracy across –40°C to +125°C junction temperature.

Technical Context

The MP2153GTF-15-P implements constant-on-time (COT) control with input voltage feed-forward, enabling stable 1.1MHz operation across 2.5V–5.5V input and maintaining tight regulation under dynamic loads. Its internal high-side P-channel and low-side N-channel MOSFETs (65mΩ/35mΩ) eliminate external power switches and support 100% duty cycle for dropout operation.

Fault protection includes cycle-by-cycle current limiting (4A peak), hiccup-mode short-circuit recovery, thermal shutdown at 160°C, and output over-voltage protection triggered at 115% of 1.5V (2.175V). The device enters sleep mode below light load thresholds to sustain 25μA IQ, and features EN-controlled sequencing with 150μs turn-on delay.

Key Specifications

Pinout & Package

SOT563 (1.6mm × 1.6mm) thermally enhanced 6-pin package with exposed pad; optimized for space-constrained PCB layouts in handheld devices and embedded modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output synchronous buck converter applications.

Compared with RT6220BGQW and TPS6286515RRLR, MP2153GTF-15-P uniquely combines SOT563 size, guaranteed 25μA IQ, and integrated output discharge - making it optimal for battery-sensitive, space-limited applications where clean shutdown behavior is mandatory.

Availability

MP2153GTF-15-P is available at Aetrix Electronics and suitable for solid-state drives, portable instrumentation, and battery-powered wireless sensors requiring stable component supply with consistent parametric performance across production lots.

Supply support for MP2153GTF-15-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 power management ICs, with design centers in the US, China, and Taiwan.

The MP2153 product line targets ultra-compact, low-IQ DC/DC conversion for portable and battery-operated systems, emphasizing integration, thermal efficiency, and ease of use in space-constrained layouts.

FAQ

What is the purpose of the OUT pin on MP2153GTF-15-P?

The OUT pin serves dual functions: it is the regulated 1.5V output power rail and the sensing node for output over-voltage protection (OVP). Internally connected to the OVP comparator, it enables real-time monitoring of VOUT without external dividers. It must be connected directly to the output capacitor's positive terminal to ensure accurate regulation and fast OVP response.

Does MP2153GTF-15-P require external feedback resistors?

No. Unlike the adjustable MP2153GTF variant, the MP2153GTF-15-P has the feedback network internally trimmed to deliver a fixed 1.5V output. The FB pin is not connected externally and is reserved for internal reference routing - eliminating resistor selection, placement, and tolerance errors in production.

How does output discharge operate during shutdown?

When EN is pulled low, the MP2153GTF-15-P activates an internal 200Ω NMOS discharge path between OUT and GND. This discharges the output capacitor within ~10ms (dependent on COUT value), ensuring VOUT falls cleanly to 0V and preventing back-powering of upstream circuitry or unintended logic states in downstream ICs.

Can MP2153GTF-15-P operate with a 2.5V input and 1.5V output?

Yes. Its 100% duty-cycle capability allows continuous regulation even when VIN equals VOUT. At VIN = 2.5V, it sustains 1.5V/3A output with >85% efficiency (per typical curves), making it suitable for single-cell Li-ion applications where input voltage drops near end-of-discharge.

What thermal derating applies at 85°C ambient?

At TA = 85°C, maximum continuous output current is derated to ~2.4A for the SOT563 package (θJA = 80°C/W), based on TJ(max) = 125°C. This is confirmed by the "Output Current Derating vs. Ambient Temperature" curve on page 9 of the datasheet, assuming standard 2-layer PCB layout per EV2153-TF-00A.

Is there a power-good signal on this part?

No. The PG pin is only present on fixed-output variants with "-P" suffix in UTQFN-6 packages (e.g., MP2153GQFU-15-P). The MP2153GTF-15-P in SOT563 does not include PG functionality - the sixth pin is OUT, not PG, as confirmed by the SOT563 pinout diagram on page 3.

What is the minimum off-time specification and why does it matter?

The minimum off-time is 100ns. This parameter prevents inductor current runaway during large load transients by enforcing a lower bound on switching period, ensuring stable operation even at very high duty cycles (e.g., VIN = 2.7V → VOUT = 1.5V). It also defines the practical lower limit of achievable output voltage in COT mode.