Monolithic Power Systems Inc. MP2317GJ-Z

Overview

MP2317GJ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter delivering 1A continuous output current with 7.5V–26V input range, 600kHz fixed switching frequency, and internal 100mΩ/50mΩ MOSFETs. It integrates soft-start, over-current protection with hiccup mode, thermal shutdown, and low-EMI SW anti-ringing for compact power supplies in white goods and flat-panel displays.

For engineers reviewing the MP2317GJ-Z datasheet, MP2317GJ-Z pinout, MP2317GJ-Z application, or MP2317GJ-Z equivalent, this page provides verified technical context, TSOT23-6 package layout guidance, real-world load regulation behavior, and validated alternative options for industrial 5V/3.3V rail generation.

Technical Context

The MP2317GJ-Z operates in fixed-frequency peak-current-mode control with internal compensation, enabling stable regulation across 3.3V–VIN×0.93 output range. Its AAM (Advanced Asynchronous Modulation) power-save mode activates below 0.4V COMP voltage to enable PFM operation at light loads.

It features a floating bootstrap driver with 2.2V UVLO (150mV hysteresis), internal VCC LDO regulated from VIN, and cycle-by-cycle OCP triggered at 1.4–3A depending on temperature. Feedback reference is trimmed to 791mV ±16mV with 50nA max bias current.

Key Specifications

Pinout & Package

MP2317GJ-Z is housed in a space-saving TSOT23-6 package (2.9mm × 1.6mm × 0.9mm), optimized for high-density layouts and automated assembly. Thermal resistance θJA = 100°C/W on 4-layer JEDEC PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2317GJ-Z, MP2315GJ-Z trades input range and output current for lower BOM cost, while RT7272BGJ8F offers higher performance at the expense of pin compatibility and layout complexity-making MP2317GJ-Z optimal for balanced 1A/24V designs in TSOT23-6 constrained spaces.

Availability

MP2317GJ-Z is available at Aetrix Electronics and suitable for white goods control boards, flat-panel display logic rails, and industrial sensor interface modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP2317GJ-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, with design centers in the US, China, and Taiwan.

The MP2317 belongs to MPS's high-efficiency synchronous buck converter product line, engineered for compact, low-noise, wide-input industrial and consumer power supplies where reliability and EMI performance are critical.

FAQ

What is the minimum recommended input voltage for reliable startup?

The MP2317GJ-Z has a VIN under-voltage lockout (UVLO) rising threshold of 5.2–7.5V, with 500mV hysteresis. Reliable startup occurs at ≥6.3V nominal, ensuring internal VCC regulation and gate driver functionality before enabling switching. Below 5.2V, the device remains fully disabled.

Can MP2317GJ-Z operate without an external bootstrap capacitor?

No. The BST pin requires a 0.1µF ceramic capacitor connected between BST and SW to form the floating supply for the high-side MOSFET driver. Omitting it prevents HS-FET turn-on and causes immediate functional failure-this capacitor is mandatory per the datasheet and internal bootstrap charging architecture.

How does the AAM power-save mode affect light-load efficiency?

AAM reduces switching frequency under light loads by blocking the internal clock when COMP voltage falls below 0.4V, enabling pulse-frequency modulation. This cuts quiescent current to 150μA and improves efficiency at ≤100mA loads-critical for standby power budgets in display and appliance applications.

Is the feedback reference voltage adjustable or fixed?

The internal reference is fixed at 791mV ±16mV (typical 791mV, min 775mV, max 807mV). Output voltage is set externally using a resistor divider from VOUT to GND, with FB connected to the divider midpoint. No trimming or external reference is supported.

What thermal derating applies above 25°C ambient?

With θJA = 100°C/W on a 4-layer JEDEC board, maximum continuous power dissipation drops linearly: PD(MAX) = (150°C − TA)/100°C/W. At 85°C ambient, max dissipation is 0.65W-requiring ≤0.6A load at 12V→5V to stay within thermal limits without additional copper or airflow.

Does MP2317GJ-Z support external synchronization?

No. The MP2317GJ-Z uses a fixed 600kHz internal oscillator with no SYNC pin or frequency adjustment capability. For synchronized multi-rail systems, designers must use master-slave timing or select alternatives like MP2318 (with SYNC pin) or MPQ2317 (automotive-grade variant with sync option).

What is the purpose of the frequency foldback feature?

When FB voltage drops below 396mV (e.g., during short-circuit), the oscillator frequency folds back to ~0.2×fSW (≈120kHz) to reduce power dissipation and improve hiccup-mode recovery margin. This is automatic and requires no external components-enhancing robustness during fault conditions.