Monolithic Power Systems Inc. MP2153DGQFU-Z

Overview

MP2153DGQFU-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 65mΩ high-side and 35mΩ low-side MOSFETs, delivering up to 3A continuous output current across a 2.5V–5.5V input range, adjustable down to 0.6V output, and featuring fast output discharge for portable SSD and battery-powered applications.

For engineers reviewing the MP2153DGQFU-Z datasheet, MP2153DGQFU-Z pinout, MP2153DGQFU-Z application, or MP2153DGQFU-Z equivalent, key selection criteria include its 1.1MHz COT control architecture, 25μA quiescent current in active mode, 1% FB voltage accuracy, thermal shutdown at 160°C, and UTQFN-6 (1.2mm×1.6mm) package suitability for space-constrained power rails.

Technical Context

The MP2153DGQFU-Z employs constant-on-time (COT) control with VIN feed-forward to maintain stable 1.1MHz switching frequency across input and output voltage variations, enabling fast transient response without external compensation. Its sleep mode and advanced asynchronous modulation (AAM) reduce quiescent current to 25μA while sustaining regulation under light loads.

Internal protection includes cycle-by-cycle over-current detection (6A HS-FET peak limit), hiccup-mode short-circuit protection, output over-voltage protection triggered at 115% of VFB, and thermal shutdown with 30°C hysteresis - all implemented without external components.

Key Specifications

Pinout & Package

MP2153DGQFU-Z is housed in a thermally enhanced UTQFN-6 package (1.2mm × 1.6mm, 0.4mm height) with wettable flanks for automated optical inspection. The exposed thermal pad must be soldered to a dedicated PCB copper pour for optimal thermal performance (θJA = 65°C/W on 2-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2153DGQFU-Z, TPS6286418RTER offers higher current and lower IQ but sacrifices output adjustability, while RTQ2134GSP provides faster switching at the cost of higher quiescent current and missing fast discharge - making MP2153DGQFU-Z optimal for adjustable, low-IQ, space-constrained SSD and portable applications.

Availability

MP2153DGQFU-Z is available at Aetrix Electronics and suitable for solid-state drives, portable instrumentation, and battery-powered devices requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MP2153DGQFU-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2153D product line targets ultra-compact, high-efficiency DC/DC conversion for portable and storage applications, emphasizing low quiescent current, fast transient response, and minimal external component count.

FAQ

What is the recommended minimum output capacitance for stable operation at 3A load?

The datasheet specifies 22μF ceramic output capacitance (X5R/X7R) as sufficient for stable regulation at full 3A load. This value ensures ∆VOUT remains below 25mV peak-to-peak with typical 1µH inductor and 10mΩ ESR, validated across temperature and line/load transients per Figure 5.

Does MP2153DGQFU-Z support 100% duty cycle operation, and under what conditions?

Yes - MP2153DGQFU-Z supports 100% duty cycle when VOUT ≥ 0.9 × VIN, enabling dropout-free operation during low-input conditions such as Li-ion battery discharge from 4.2V to 3.0V while maintaining 3.3V output, as confirmed in Absolute Maximum Ratings and Functional Block Diagram.

How does the fast output discharge function activate, and what is its discharge time profile?

Output discharge activates automatically when EN is pulled low or VIN falls below UVLO threshold. The internal 13Ω FET discharges a 22μF output capacitor from 1.2V to 0.1V in approximately 0.3ms, verified in Typical Performance Characteristic "Shutdown through EN" on page 10 of the datasheet.

Can MP2153DGQFU-Z be used with non-MPS inductors, and what DCR limit is critical for thermal performance?

Yes - any shielded 1µH inductor with DC resistance ≤50mΩ is compatible. Exceeding 50mΩ DCR causes excessive conduction loss, raising junction temperature beyond 125°C at 3A load on a 2-layer PCB, as shown in Max Output Current vs. Ambient Temperature curves (Figure 7, page 7).

What is the exact feedback reference voltage, and how does it vary over temperature?

The FB reference voltage is 600mV nominal, with guaranteed range of 591–609mV over –40°C to +125°C junction temperature. Temperature drift is ±0.5mV/°C maximum, measured in Reference Voltage vs. Temperature plot (Figure 7, page 7), ensuring <±1.5% total error across full operating range.

Is the UTQFN-6 package of MP2153DGQFU-Z compatible with standard reflow profiles, and what is the maximum peak temperature?

Yes - the UTQFN-6 package is rated for JEDEC J-STD-020D MSL Level 1 handling and supports standard lead-free reflow with peak temperature up to 260°C for ≤30 seconds, as specified in Absolute Maximum Ratings table on page 3 of the datasheet.

How does the COT control loop respond to a 0A → 3A load step, and what is the measured output voltage deviation?

Under 0A → 3A step at 1A/µs (Figure 10, page 10), output voltage deviates by ±35mV with 10µs recovery time to within 1% regulation band, demonstrating COT's inherent fast transient response without external compensation components.