Monolithic Power Systems Inc. MP1472GJ-Z

Overview

MP1472GJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC integrating 175mΩ high-side and 115mΩ low-side MOSFETs, delivering 2A continuous output current across 4.75V–18V input range, with adjustable output from 0.923V to 15V and fixed 340kHz switching frequency-used in FPGA/DSP power supplies and notebook computers.

For engineers reviewing the MP1472GJ-Z datasheet, MP1472GJ-Z pinout, MP1472GJ-Z application, or MP1472GJ-Z equivalent, key selection criteria include input UVLO threshold (3.8V), feedback voltage accuracy (±2.5%), soft-start programmability via external capacitor, and thermal shutdown at 160°C-critical for compact, high-efficiency point-of-load designs.

Technical Context

The MP1472GJ-Z employs current-mode control architecture with internal transconductance error amplifier (GEA = 800μA/V) and cycle-by-cycle overcurrent protection, enabling fast transient response and stable regulation under variable load conditions. Its functional block includes integrated high- and low-side N-channel MOSFETs, bootstrap capacitor charging circuitry (via SW–BS connection), and dedicated COMP pin for loop compensation.

Operation relies on a fixed 340kHz oscillator with short-circuit frequency reduction to 100kHz, input under-voltage lockout (UVLO) with 210mV hysteresis, and EN pin logic-level enable/disable with 1.5V rising threshold. The device supports ceramic output capacitors due to inherent stability with low-ESR loads and features programmable soft-start via SS pin current (6μA) and external capacitor.

Key Specifications

Pinout & Package

MP1472GJ-Z is housed in an 8-pin TSOT23-8 package, measuring 2.9mm × 1.6mm × 0.85mm, with exposed pad for thermal enhancement. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP1472GJ-Z, MP1476GQ-P offers higher current and frequency at the cost of layout redesign, while TPS562201DSQR trades soft-start flexibility and BST optimization for integration simplicity-making MP1472GJ-Z optimal for compact, thermally constrained 2A PoL designs requiring full control over startup and efficiency tuning.

Availability

MP1472GJ-Z is available at Aetrix Electronics and suitable for FPGA power supplies, notebook subsystem regulation, and green appliance control boards requiring stable component supply and long-term manufacturability.

Supply support for MP1472GJ-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP1472 belongs to MPS's synchronous buck converter product line, designed specifically for space-constrained, high-efficiency point-of-load applications in computing, networking, and consumer electronics where integration, thermal performance, and ease of layout are critical.

FAQ

What is the recommended input capacitor for MP1472GJ-Z?

A minimum 10μF ceramic capacitor (X5R/X7R dielectric) placed close to the IN pin is recommended to handle high-frequency switching ripple. For best results, combine it with a 0.1μF ceramic capacitor directly at the IN–GND pins to suppress high-frequency noise. Total RMS current rating should exceed half the maximum load current (≥1A RMS for 2A output).

Can MP1472GJ-Z operate with a 3.3V input?

No-MP1472GJ-Z has a minimum input voltage of 4.75V due to its internal UVLO threshold of 3.8V (with 210mV hysteresis). Operation below 4.75V will cause the device to remain in shutdown. For 3.3V input applications, consider alternatives like MP2315 or TPS562210 with lower VIN minima.

How is output voltage accuracy affected by resistor tolerance in the FB divider?

Output voltage error is directly proportional to resistor tolerance. With 1% R1 and R2, total VOUT error is ≤±2.5% (including FB reference tolerance). Using 0.5% resistors reduces divider contribution to <±0.6%, allowing tighter overall regulation-critical for low-voltage FPGA cores where ±30mV margin is typical.

Is an external bootstrap diode required for MP1472GJ-Z?

An external Schottky diode (e.g., IN4148) from VOUT to BS is recommended-but not mandatory-when VOUT ≥3.3V and duty cycle exceeds 65% (i.e., VIN >5V for 3.3V output). It improves high-side gate drive efficiency by reducing BST capacitor discharge losses during high-duty cycles.

What is the minimum inductor value supported for stable operation?

The minimum inductor value depends on input/output conditions, but 6.8μH is validated for 1.8V output (e.g., Wurth 7440650068). Lower values risk excessive ripple current (>30% of switch limit) and potential instability. Inductor saturation current must exceed peak inductor current: ILPEAK ≈ ILOAD + (ΔIL/2), where ΔIL = (VOUT × (VIN−VOUT)) / (VIN × fSW × L).

Does MP1472GJ-Z support forced PWM mode?

No-MP1472GJ-Z operates exclusively in PWM mode with fixed 340kHz frequency and does not include pulse-skipping or burst-mode capability. Light-load efficiency is maintained via low quiescent current (1.5mA active, 1μA shutdown), but it lacks automatic mode switching found in newer MPS regulators like MP1476.

How does the COMP pin compensation affect transient response?

The COMP pin sets the control loop's pole-zero locations: R3 and C3 define dominant pole and zero for phase margin; optional C6 compensates ESR zero of output capacitors. Proper compensation (e.g., 5.6kΩ + 3.3nF for 3.3V/10μH/22μF) achieves ~60° phase margin and <10μs load-step recovery-verified in typical application circuits per datasheet Figure 4.