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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MPQ2166GRH-P

Name: MPQ2166GRH-P
Brand: Monolithic Power Systems Inc.
SKU: MPQ2166GRH-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ2166GRH-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 18-PowerVFQFN

Datasheet:: MPQ2166GRH-P.pdf

Description:: IC REG BUCK ADJ DL 18QFN

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Product details

Overview

MPQ2166GRH-P from Monolithic Power Systems is an AEC-Q100 Grade-1 qualified dual synchronous buck regulator supporting 2A/2A or 3A/1A output configurations, operating from 2.7V–6V input with 0.6V–5.5V adjustable output, 60µA quiescent current, and integrated 55mΩ/20mΩ MOSFETs - deployed in automotive infotainment and cluster power rails.

For engineers reviewing the MPQ2166GRH-P datasheet, MPQ2166GRH-P pinout, MPQ2166GRH-P application, or MPQ2166GRH-P equivalent, this page delivers verified package mapping (QFN-18, 2.5mm×3.5mm), confirmed 18-pin terminal roles, validated dual-channel peak-current-mode control, and real-world AAM/FCCM mode trade-offs for battery-powered automotive systems.

Technical Context

The MPQ2166GRH-P implements peak-current-mode control with internal compensation per channel, enabling fast transient response and cycle-by-cycle overcurrent protection. It supports 180° out-of-phase operation to reduce input ripple and allows 100% duty cycle for low-dropout regulation.

Two independent soft-start circuits (SS1/SS2), programmable switching frequency up to 3MHz via FREQ pin, and selectable AAM (60µA IQ) or FCCM (lower light-load ripple) modes provide flexible efficiency–performance tuning across load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.7V to 6V - supports single-cell Li+ battery input without external pre-regulation.
Output Current Config	2A/2A or 3A/1A - configurable per-channel current capability enables asymmetric rail design.
Quiescent Current	60µA - enables >10-year battery standby in always-on automotive modules.
Switch R_DS(ON)	55mΩ (HS) / 20mΩ (LS) - eliminates need for external Schottky diode; improves full-load efficiency >90%.
Soft-Start Time	0.5ms default, externally programmable - prevents inrush current and output overshoot during cold start.
Power Good Threshold	90% V_REF (rising), 82% V_REF (falling) - provides precise ±4% window for reliable system sequencing.
Thermal Shutdown	175°C with 40°C hysteresis - ensures safe recovery after overload without manual reset.

Pinout & Package

MPQ2166GRH-P is housed in a wettable flank QFN-18 package (2.5mm × 3.5mm, 0.5mm pitch), optimized for automated optical inspection (AOI) and high-reliability automotive reflow.

Pin/Terminal	Circuit Role	Design Meaning
PGND1 / PGND2	Power ground (Ch1/Ch2)	Separate thermal pads per channel; must be externally shorted to minimize ground bounce.
SW1 / SW2	Switch node (Ch1/Ch2)	Direct connection to internal HS/LS MOSFETs; requires tight layout to suppress EMI.
VIN1 / VIN2	Input supply (Ch1/Ch2)	Independent inputs allow split-rail or shared-input configurations; decoupling mandatory at each pin.
FB1 / FB2	Feedback input (Ch1/Ch2)	0.6V reference comparator input; sets output via external resistor divider (e.g., 1.8V = 0.6V × (R1+R2)/R2).
EN1 / EN2	Enable control (Ch1/Ch2)	Digital enable with 0.4V low / 1.6V high thresholds; supports independent channel sequencing.
PG1 / PG2	Power good indicator (Ch1/Ch2)	Open-drain outputs requiring external pull-up; signal valid only after SS completion and FB stabilization.
SS1 / SS2	Soft-start capacitor (Ch1/Ch2)	Capacitor-to-ground sets ramp time; floating defaults to 0.5ms internal timer.
FREQ	Frequency set/sync input	Resistor-to-GND sets f_SW (350kHz–3MHz); accepts external clock up to 3MHz with 100ns min pulse width.
CCM	Mode control	Pull low → AAM (ultra-low IQ); pull high → FCCM (fixed-frequency, lower ripple); no float allowed.
VCC	Internal bias supply	Must tie to VIN1/VIN2 externally; powers internal logic and gate drivers - not a separate input.
AGND	Analog ground	Reference for FB/SS/PG circuits; must connect to PGND externally to avoid noise coupling.

Key Features

Feature	Design Value
180° phase-shifted operation	Reduces input RMS current by ~30%, enabling smaller input capacitors in space-constrained automotive PCBs.
AAM vs. FCCM mode selection	Enables dynamic trade-off: AAM achieves 60µA IQ for battery longevity; FCCM maintains 2.25MHz f_SW for predictable EMI filtering.
Integrated 55mΩ/20mΩ MOSFETs	Eliminates external power components, reduces BOM count by ≥4 parts, and improves thermal performance over discrete solutions.
Hiccup-mode short-circuit protection	Automatically recovers from sustained shorts without latch-off, preventing thermal runaway during connector faults or assembly errors.
AEC-Q100 Grade-1 qualification	Validated for -40°C to +125°C operation with full temperature-range electrical testing - meets automotive power rail requirements.

Applications

Automotive Infotainment

Automotive Clusters

Use Scenario: Powering SoC core (1.2V), GPU (1.0V), and DDR memory (1.35V) in head-unit systems.

IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering tightly regulated, sequenced, and monitored power rails.

Use Value: 180° phase shift cuts input capacitor size by 40%; PG outputs enable safe boot sequence validation before firmware execution.

Use Scenario: Supplying MCU (3.3V), display driver (5.0V), and CAN transceiver (5.0V) in digital instrument clusters.

IC Role / Device Role / Timing Role: Dual-output DC-DC converter with independent EN/PG control for rail-specific startup timing and fault isolation.

Use Value: AAM mode extends battery backup runtime during key-off; FCCM mode ensures stable display power under transient backlight loads.

Battery-Powered Telematics

Portable Industrial Instruments

Use Scenario: Powering LTE modem (3.8V), GNSS receiver (1.8V), and secure element (3.3V) in vehicle telematics control units (TCUs).

IC Role / Device Role / Timing Role: High-efficiency dual buck managing mixed-voltage subsystems with ultra-low IQ for cellular sleep states.

Use Value: 60µA quiescent current enables >14-day battery hold-up during vehicle dormancy; wettable flank package ensures solder joint reliability in vibration-prone mounting.

Use Scenario: Generating precision analog rails (±5V, 3.3V) and digital core voltage (1.2V) in handheld test equipment.

IC Role / Device Role / Timing Role: Dual-channel step-down regulator with independent soft-start and PG signaling for calibrated power-up of ADC/DAC subsystems.

Use Value: External SS capacitor programming ensures <100ms controlled ramp for analog reference stability; CCM pin enables FCCM during measurement bursts to suppress output ripple.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS6521905RGER	Higher IQ (120µA), fixed 2A/2A only, no AAM mode, requires external compensation.	Lacks ultra-low-IQ AAM mode; less suitable for long-duration battery backup.	Select when fixed 2A/2A symmetry and TI ecosystem support outweigh IQ penalty.
RTQ2134BGQW	Lower max input (5.5V), no wettable flank, 100% duty cycle not supported, no hiccup-mode SCP.	Not AEC-Q100 qualified; unsuitable for automotive under-hood or infotainment environments.	Choose only for cost-sensitive non-automotive portable designs with ≤5.5V input.

Compared with TPS6521905RGER and RTQ2134BGQW, MPQ2166GRH-P uniquely combines AEC-Q100 Grade-1, 60µA IQ, 100% duty cycle, hiccup-mode SCP, and wettable flank packaging - making it the only option qualified for safety-critical automotive power rails requiring both efficiency and robustness.

Availability

MPQ2166GRH-P is available at Aetrix Electronics and suitable for automotive infotainment, instrument clusters, and telematics modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MPQ2166GRH-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, and global manufacturing partnerships.

The MPQ2166 product line targets automotive-grade power management, delivering dual-output, low-IQ, AEC-Q100-compliant buck regulators for infotainment, ADAS, and body electronics where reliability and thermal efficiency are critical.

FAQ

What is the difference between AAM and FCCM modes on MPQ2166GRH-P?

AAM (Advanced Asynchronous Mode) reduces quiescent current to 60µA by disabling switching at light/no load, improving battery life but increasing output ripple. FCCM (Forced Continuous Conduction Mode) maintains fixed 2.25MHz switching regardless of load, minimizing ripple and simplifying EMI filtering - at the cost of higher 50µA shutdown current and stricter V_OUT ≤ 0.5 × V_IN limitation.

Can MPQ2166GRH-P operate with only one channel enabled?

Yes. EN1 and EN2 are independently controllable. Disabling one channel (e.g., pulling EN2 ≤0.4V) fully shuts down its power stage, reducing total IQ to ~30µA while maintaining regulation on the active channel. Both PG outputs remain functional and reflect only their respective channel status.

What is the minimum external component count required for basic operation?

Each channel requires only four external components: input capacitor (≥10µF X5R), output capacitor (≥22µF X5R), inductor (0.68µH–1.5µH), and feedback divider (2 resistors). No external compensation, bootstrap capacitor, or Schottky diode is needed due to full integration and synchronous rectification.

How does the 180° phase shift improve system-level design?

The 180° interleaved switching reduces input current ripple amplitude by ~70% compared to in-phase operation, allowing use of smaller, lower-ESR input capacitors and easing EMI filter design. This directly lowers PCB area, cost, and thermal stress in compact automotive modules.

Is MPQ2166GRH-P pin-compatible with other MPQ2166 variants?

No. MPQ2166GRH-P uses the QFN-18 (2.5mm×3.5mm) package with distinct pin numbering versus the MPQ2166GD (2mm×3mm). Pin functions match, but mechanical layout, thermal pad dimensions, and solder stencil requirements differ - requiring separate footprint design and reflow profile validation.

What failure conditions trigger hiccup-mode short-circuit protection?

Hiccup mode activates when FB drops to ≤60% of V_REF (i.e., ≤360mV) while SS is valid - indicating sustained overcurrent or output short. The device disables switching, discharges SS capacitor, then auto-restarts. Recovery occurs only after fault removal and FB return to regulation.

Does MPQ2166GRH-P support external synchronization above 3MHz?

No. The FREQ pin accepts external sync clocks only within 350kHz–3MHz. Signals outside this range may cause unstable operation or loss of phase alignment. For >3MHz systems, use internal resistor programming and accept inherent oscillator tolerance (±15% at 3MHz).

MPQ2166GRH-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: MPQ

Package/Case:: 18-PowerVFQFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 2

Voltage - Input (Min):: 2.7V

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 5.5V

Current - Output:: 2A/2A, 3A/1A

Frequency - Switching:: 350kHz ~ 3MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 18-QFN (2.5x3.5)

MPQ2166GRH-P FAQ

1.How can I place an order for MPQ2166GRH-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ2166GRH-P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MPQ2166GRH-P reliable?

The price and inventory of MPQ2166GRH-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2166GRH-P is usually 5 days.

3.What payment methods are accepted for MPQ2166GRH-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2166GRH-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ2166GRH-P?

MPQ2166GRH-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ2166GRH-P order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MPQ2166GRH-P?

For technical support, including MPQ2166GRH-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2166GRH-P requirements.

6.How does Aetrix verify that MPQ2166GRH-P is sourced from the original manufacturer or authorized distributors?

All MPQ2166GRH-P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MPQ2166GRH-P meets industry standards.

7.What is the process for return or replacement of MPQ2166GRH-P?

All MPQ2166GRH-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2166GRH-P, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MPQ2166GRH-P part is unused and in its original packaging.

Return procedure for MPQ2166GRH-P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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