Monolithic Power Systems Inc. MP5087AGG-Z

Overview

MP5087AGG-Z from Monolithic Power Systems is a 5.5V, 7A low-R_DS(ON) load switch IC with programmable current limit (via ILIM pin), power-good indicator, output discharge function, and soft-start control. It operates across 0.5V–5.5V input voltage range, delivers <10 mΩ R_DS(ON) at 5V V_CC, and shuts down with <1 µA quiescent current - deployed in portable computing power rails for inrush suppression and rail sequencing.

For engineers reviewing the MP5087AGG-Z datasheet, MP5087AGG-Z pinout, MP5087AGG-Z application, or MP5087AGG-Z equivalent, this page provides verified functional identity, validated QFN-12 pin mapping, confirmed 7A programmable OCP behavior, thermal shutdown at 155°C, and PG push-pull logic tied to VIN >3V - all critical for portable system power domain isolation and fault management.

Technical Context

The MP5087AGG-Z integrates a sense-FET-based current-limit architecture where external resistor on ILIM sets threshold via I_LIM = 82 kΩ / R_LIM(Ω); regulation engages within ~20 µs after overcurrent detection. Its soft-start uses a 9 µA internal current source charging an external capacitor on SS pin, scaling output slew rate at 3× the SS voltage ramp.

Power-good logic monitors VIN directly: PG asserts high when VIN exceeds 2.8 V (typ) with 100 mV hysteresis; short-circuit protection triggers a 200 ns fast-turnoff at ~13 A peak, followed by 80 µs auto-retry. Thermal shutdown activates at 155°C (30°C hysteresis) and disables the FET until junction cools.

Key Specifications

Pinout & Package

MP5087AGG-Z is housed in a thermally enhanced QFN-12 package measuring 2 mm × 2 mm with exposed thermal pad (pin 2 serves as GND and thermal anchor). The package supports high-density layout and efficient heat dissipation in ultra-thin mobile designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar load switch applications.

Compared with TPS22965DSGR and NIS5132MN, MP5087AGG-Z uniquely combines programmable OCP, integrated output discharge, push-pull PG, and 200 ns short-circuit response - making it optimal for compact, feature-rich portable power domains demanding full rail control and diagnostics.

Availability

MP5087AGG-Z is available at Aetrix Electronics and suitable for notebook power sequencing, USB-C PD subsystems, and SSD enable circuits requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP5087AGG-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-efficiency analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP5087A belongs to MPS's load switch product line, engineered specifically for space-constrained portable electronics requiring precision current limiting, rail sequencing, and intelligent fault handling without external components.

FAQ

What is the minimum recommended soft-start capacitor value for MP5087AGG-Z?

The datasheet specifies a minimum soft-start capacitor of 4.7 nF on the SS pin. Using smaller values risks uncontrolled output voltage rise time, potentially triggering current limit during startup due to insufficient slew rate control. Larger capacitors extend soft-start duration linearly per T_SS = (V_OUT × C_SS) / (3 × 9 µA).

How does the ILIM resistor affect current limit accuracy and temperature drift?

The ILIM resistor sets current limit using I_LIM = 82 kΩ / R_LIM. Accuracy depends on resistor tolerance and temperature coefficient; a 1% 100 ppm/°C resistor yields ±1.5% total error over –40°C to +85°C. The internal auto-zero comparator minimizes offset drift, maintaining stable trip point across temperature.

Can MP5087AGG-Z operate with VCC supplied from a different rail than VIN?

Yes - VCC (3–5.5 V) may be derived independently from VIN (0.5–5.5 V). This enables flexible sequencing, such as powering control circuitry from a standby rail while switching a higher-current main rail. VCC must be stable before enabling EN to ensure proper logic operation.

What happens to the PG pin when VIN drops below 2.8 V?

When VIN falls below the falling threshold (~2.7 V, due to 100 mV hysteresis), PG transitions low within 5 µs (deglitch delay). This fast, clean transition allows microcontrollers to detect brown-out conditions and initiate controlled shutdown before system instability occurs.

Is the output discharge function active during thermal shutdown?

Yes - output discharge remains active whenever EN is low or VCC falls below UVLO (2.6 V), including during thermal shutdown recovery. The 200 Ω internal pulldown ensures VOUT discharges rapidly even if the FET is latched off, preventing unsafe residual voltage on isolated loads.

Does MP5087AGG-Z support reverse current blocking?

No - MP5087AGG-Z is a single-direction high-side switch with no intrinsic reverse-current blocking capability. External diode or back-to-back FET configuration is required if reverse current flow from VOUT to VIN must be prevented during fault or standby conditions.

What is the maximum allowable power dissipation at 85°C ambient temperature?

Using θ_JA = 80°C/W and T_J(MAX) = 150°C, maximum continuous power dissipation at 85°C ambient is (150 − 85) / 80 = 0.81 W. At 7A and 10 mΩ, conduction loss is 0.49 W - well within limit, assuming adequate PCB copper area and thermal vias under the exposed pad.