Monolithic Power Systems Inc. MP2420GF-P

Overview

MP2420GF-P from Monolithic Power Systems is a 75V, 0.3A synchronous step-down DC/DC converter with integrated high- and low-side MOSFETs (1.2Ω/0.45Ω R_DS(on)) and a programmable window watchdog. It delivers regulated output in automotive and industrial power systems with 4.5–75V input, 1% FB voltage tolerance at room temperature, and 5μA shutdown current. Used in battery-powered telematics modules for stable 3.3V/5V rail generation under cold-crank conditions.

For engineers reviewing the MP2420GF-P datasheet, MP2420GF-P pinout, MP2420GF-P application, or MP2420GF-P equivalent, key selection criteria include its integrated watchdog timing modes (short/long window), BST bootstrap operation constraints, thermal shutdown threshold (175°C), and TSSOP-16 EP package thermal resistance (θ_JA = 45°C/W).

Technical Context

The MP2420GF-P employs a current-mode PWM control architecture with zero-current detection (ZCD) to regulate output voltage via feedback comparison against a 1V internal reference. Its dual-path power supply-using either VIN or BIAS (≥2.9V)-enables efficiency optimization in wide-input applications.

Watchdog functionality operates independently of the DC/DC section: WDI triggers reset windows defined by external RTIMER (e.g., 51kΩ sets ~880μs period), while MODE pin selects between short-window (t2+t3 = 25 cycles) and long-window (t4+t5 = 2500 cycles) operation. WDO asserts active-low reset pulses (4-cycle width) upon timeout or VCC POR violation (VPOR-HIGH = 4.6V).

Key Specifications

Pinout & Package

The MP2420GF-P is housed in a thermally enhanced TSSOP-16 EP package with exposed pad soldered to GND plane for θ_JC = 10°C/W. Pin 13 (SW) and Pin 16 (/WD_DIS) are electrically isolated per functional block; Pin 4 and Pin 13 share GND connection but require separate low-impedance paths to minimize noise coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2420GF-P, MPQ2420GF-A adds AEC-Q100 qualification and ESD hardening at no layout penalty, while LM5164QPWPRQ1 trades integrated watchdog for higher current and lower BOM cost-making MP2420GF-P optimal for space-constrained safety-critical nodes needing self-contained supervision.

Availability

MP2420GF-P is available at Aetrix Electronics and suitable for automotive telematics control units, industrial PLC I/O modules, and battery-powered fleet trackers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MP2420GF-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.

The MP2420 product line targets automotive and industrial power conversion where high input voltage tolerance, integrated safety features, and ultra-low quiescent current are mandatory-enabling robust, compact, and energy-efficient power architectures.

FAQ

What is the minimum recommended inductor value for MP2420GF-P at 75V input?

The minimum inductor value is calculated using L_MIN = (V_IN(MAX) × t_ON(MIN)) / I_PEAK, where t_ON(MIN) = 115ns and I_PEAK = 730mA. At 75V input, L_MIN = (75V × 115ns) / 0.73A ≈ 11.8μH. A 15μH inductor is recommended to ensure stable operation and margin against saturation.

Can the MP2420GF-P operate without connecting the BIAS pin?

Yes-the MP2420GF-P functions with BIAS unconnected, using VIN to power internal circuitry. However, connecting BIAS to a regulated output (2.9–5.5V) improves light-load efficiency by 2–3% and reduces thermal stress on the high-side FET driver, especially below 50mA load.

How does the watchdog respond to a missing WDI pulse in long-window mode?

In long-window mode (MODE = high), if WDI_OK is not received within t4 + t5 (2500 cycles), WDO asserts a low reset pulse for 4 cycles. The watchdog then enters sync-monitor state, requiring a valid WDI_OK pulse within t1 (450 cycles) to resume normal operation-preventing spurious resets during brief MCU stalls.

Is the TSSOP-16 EP package RoHS-compliant and lead-free?

Yes-MP2420GF-P is fully RoHS-compliant, lead-free, and halogen-free per MPS green status documentation. The exposed pad is nickel-palladium-gold plated, and all packaging materials meet JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements.

What happens to POK output during thermal shutdown?

During thermal shutdown, the POK output is actively pulled low regardless of output voltage level. This provides unambiguous fault signaling to system supervisors, distinguishing thermal fault from undervoltage or startup conditions-enabling appropriate thermal derating or forced-cooling response.

Can the MP2420GF-P be used with an input voltage below 4.5V?

No-operation below 4.5V violates the specified minimum input voltage. The UVLO rising threshold is 4.2V with 0.45V hysteresis, meaning the device remains disabled until VIN exceeds 4.2V and stays above 3.75V. Below 4.5V, insufficient gate drive margin exists for reliable high-side FET operation.

How is the watchdog timer period affected by temperature?

The watchdog period exhibits ±10% variation over −40°C to +125°C junction temperature, as confirmed by typical characteristics plots. For RTIMER = 51kΩ, period shifts from ~800μs at −40°C to ~910μs at +125°C-within specification for non-safety-critical timing margins.