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

Monolithic Power Systems Inc. MP2104DQT-LF-P

Name: MP2104DQT-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MP2104DQT-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP2104DQT-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 6-WDFN Exposed Pad

Datasheet:: MP2104DQT-LF-P.pdf

Description:: IC REG BUCK ADJ 600MA 6TQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP2104DQT-LF-P from Monolithic Power Systems is a 1.7MHz, 600mA synchronous step-down DC/DC converter in a 6-pin TQFN-6 package with exposed thermal pad. It operates from 2.5V–6V input, delivers adjustable output down to 0.6V via external resistor divider, supports 100% duty cycle for low-dropout operation, and integrates both high-side PFET and low-side NFET switches-eliminating need for external Schottky diode. It powers Li+-battery-powered portable electronics requiring compact, high-efficiency regulation.

For engineers reviewing the MP2104DQT-LF-P datasheet, MP2104DQT-LF-P pinout, MP2104DQT-LF-P application, or MP2104DQT-LF-P equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and confirmed alternative options for voltage regulator selection in space-constrained, battery-operated systems.

Technical Context

The MP2104DQT-LF-P implements constant-frequency (1.7MHz) current-mode PWM control with slope compensation, enabling stable regulation and cycle-by-cycle overcurrent protection. Its internal architecture integrates a 0.44Ω PFET main switch and 0.29Ω NFET synchronous rectifier, delivering up to 95% efficiency at 600mA load.

It features a precision 0.600V ±2% feedback reference, <0.1μA shutdown current, and thermal shutdown at 145°C. The device supports dropout operation by extending duty cycle to 100%, maintaining regulation as VIN approaches VOUT-critical for single-cell Li+ battery discharge profiles.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	1.7MHz ±22% - Enables use of small 2.2μF ceramic input and 4.7–10μF output capacitors; reduces solution footprint vs. lower-frequency converters.
Max Output Current	600mA continuous - Sufficient for core supplies of microprocessors, DSPs, and camera modules in handheld devices.
Input Voltage Range	2.5V to 6V - Matches full discharge range of single-cell Li+ batteries (3.0–4.2V nominal, down to ~2.7V cutoff).
Feedback Reference Voltage	0.600V ±2% - Sets output accuracy; enables precise 0.6V–6V adjustment using standard 1% resistors (e.g., 300kΩ/150kΩ for 1.8V).
PFET / NFET R_DS(on)	0.44Ω / 0.29Ω - Minimizes conduction loss at 600mA; contributes to >90% efficiency across 10–600mA load range.
Shutdown Current	<0.1μA - Preserves battery life during system sleep modes without requiring external power gating.
Thermal Resistance θ_JA	50°C/W (TQFN-6 on 4-layer PCB) - Supports 0.57W max power dissipation; requires exposed pad soldered to GND plane for thermal integrity.

Pinout & Package

MP2104DQT-LF-P uses a 2.9mm × 2.9mm × 0.75mm TQFN-6 package with wettable flank leads and an exposed thermal pad (Pin 2 & 6) that must be soldered to a PCB GND plane for thermal performance and electrical stability.

Pin/Terminal	Circuit Role	Design Meaning
1 (SW)	Power Switch Node	Connects to inductor; carries high di/dt switching current; requires short, low-inductance trace to minimize EMI and voltage spikes.
2 & 6 (GND)	Ground / Exposed Pad	Primary thermal path and signal return; must be connected to large internal/external GND plane-failure causes thermal shutdown or instability.
3 (EN)	Enable Control Input	Logic-level enable: >1.5V = ON, <0.3V = shutdown (<0.1μA I_Q); compatible with GPIOs without level-shifting.
4 (FB)	Feedback Input	Senses output via external resistor divider; 0.6V threshold sets regulation point; sensitive node-requires short, shielded routing near IC.
5 (IN)	Input Supply	Accepts 2.5–6V; requires ≥2.2μF X5R/X7R ceramic capacitor placed within 2mm of pin to suppress high-frequency ripple.

Key Features

Feature	Design Value
Synchronous Rectification	Integrated 0.29Ω NFET replaces Schottky diode-eliminates 0.3–0.5V forward drop, boosting light-load efficiency by 8–12%.
100% Duty Cycle Operation	Maintains regulation when VIN drops to VOUT + I_LOAD×(R_{DS(on)_PFET} + R_{DCR_IND}); extends usable battery runtime by ~15% in deep discharge.
Current-Mode PWM Control	Provides inherent cycle-by-cycle current limiting (0.7–1.35A PFET limit), fast transient response, and stable operation with minimal output capacitance.
Thermal & Short-Circuit Protection	Auto-recovering shutdown at 145°C junction temp; reduces switching frequency and current limit during output short-prevents damage without external circuitry.
Low Shutdown Quiescent Current	<0.1μA enables multi-week standby in always-on IoT sensors or wearable health monitors powered by coin cells or small Li+ packs.

Applications

Smartphone Baseband Core Supply

Digital Camera Image Sensor Bias

Use Scenario: Powers ARM Cortex-A series baseband processor core (1.0–1.2V @ 300–500mA) from single-cell Li+ battery (2.8–4.2V).

IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing dynamically scaled core voltage; responds to DVFS commands via FB divider reconfiguration.

Use Value: 93% peak efficiency at 400mA preserves battery capacity; 1.7MHz switching avoids AM radio band interference; 100% duty cycle sustains operation until battery reaches 2.7V.

Use Scenario: Supplies clean 2.8V bias to CMOS image sensor analog front-end in compact digital still/video cameras.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR step-down regulator; SW node isolated from sensor analog ground via layout partitioning.

Use Value: <0.1μA shutdown current enables instant-on wake from deep sleep; tight 0.6V FB reference ensures ±1.5% output accuracy across temperature for consistent ADC reference scaling.

Portable Medical Pulse Oximeter

Bluetooth LE Audio Earbud DSP Core

Use Scenario: Generates 1.8V for optical sensor controller MCU and analog signal chain in battery-powered pulse oximeters.

IC Role / Device Role / Timing Role: Single-chip power solution replacing discrete buck + LDO; EN pin synchronized to measurement burst timing.

Use Value: TSOT23-5 and TQFN-6 footprints fit sub-20mm² PCB area; thermal pad attachment ensures reliability under continuous 8-hour clinical monitoring duty cycle.

Use Scenario: Delivers 1.1V @ 200mA to Bluetooth 5.2 audio DSP in true wireless stereo (TWS) earbuds with 35mm³ volume constraint.

IC Role / Device Role / Timing Role: High-efficiency intermediate regulator between battery and ultra-low-dropout post-regulator for noise-sensitive RF/analog blocks.

Use Value: 95% efficiency at 200mA extends talk time by 18 minutes per charge; 1.7MHz frequency allows use of 2.2μF input cap-reducing BOM count vs. 500kHz alternatives.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS62231DRYR (TI)	1.8MHz switching, 600mA, 0.6V FB, but uses external compensation and lacks 100% duty cycle mode.	Requires additional RC network for loop stability; unsuitable for Li+ end-of-discharge regulation below 3.0V.	Select when board space allows extra passives and input stays >3.0V; avoid if deep battery discharge support is required.
RT8059ZSP (Richtek)	1.5MHz, 600mA, 0.6V FB, integrated soft-start, but higher 1.2μA shutdown current and no thermal pad in SOT-23-6.	Higher quiescent loss reduces standby time; limited thermal headroom above 400mA continuous load.	Prefer for cost-sensitive designs where <0.1μA shutdown is non-critical and ambient temperature remains <60°C.

Compared with TPS62231DRYR and RT8059ZSP, MP2104DQT-LF-P uniquely combines 100% duty cycle operation, <0.1μA shutdown, and TQFN-6 thermal pad-making it optimal for Li+-powered portable devices demanding maximum runtime, smallest footprint, and robust thermal management.

Availability

MP2104DQT-LF-P is available at Aetrix Electronics and suitable for smartphone baseband supplies, portable medical sensor rails, Bluetooth LE audio DSP cores, and digital camera image sensor bias requiring stable component supply, lead-free compliance, and long-term production continuity.

Supply support for MP2104DQT-LF-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 mixed-signal ICs for power management, motor drive, and automotive applications.

The MP2104 belongs to MPS's high-frequency synchronous buck converter product line, designed specifically for space-constrained, battery-powered portable electronics requiring high efficiency, low quiescent current, and seamless low-dropout operation.

FAQ

What is the minimum recommended input voltage for reliable operation of MP2104DQT-LF-P?

The absolute minimum input voltage is 2.5V per datasheet specifications. Below this, UVLO (2.10–2.45V threshold) disables regulation. For sustained 600mA output at 1.8V, VIN must remain ≥2.8V to maintain sufficient headroom across PFET R_DS(on) and inductor DCR losses-verified in typical performance curves at 2.5V input with reduced load capability.

Can MP2104DQT-LF-P be used with ceramic output capacitors only, or is an electrolytic capacitor required?

Ceramic capacitors only are fully supported and recommended. The datasheet specifies X5R/X7R dielectrics (e.g., 4.7μF input, 10μF output) due to low ESR and stable capacitance vs. voltage/temperature. No electrolytic or tantalum capacitor is needed-enabling smaller size, longer lifetime, and improved reliability in portable designs.

How does the 100% duty cycle mode function, and what triggers its activation?

100% duty cycle activates automatically when VIN drops near VOUT, causing the control loop to extend the high-side PFET on-time continuously. It is not user-configurable but inherent to the current-mode architecture. During this mode, output voltage equals VIN minus I_LOAD×(R_{DS(on)_PFET} + R_{DCR_IND}), sustaining regulation down to ~2.7V for a 1.8V rail.

Is the exposed thermal pad on the TQFN-6 package electrically connected internally?

Yes-the exposed pad (Pins 2 and 6) is internally connected to GND. It must be soldered to a dedicated PCB GND plane with ≥4 thermal vias (0.3mm diameter) to achieve the specified θ_JA = 50°C/W. Leaving it floating degrades thermal performance and may cause premature thermal shutdown under 400mA+ loads.

What is the recommended inductor value for a 1.8V/600mA application with 3.3V input?

A 2.2μH inductor is recommended per Table 2 in the datasheet (e.g., Coilcraft LP1704-222M). This value balances ripple current (~30% of 600mA = 180mA), efficiency (>92%), and transient response. Inductor saturation current must exceed 1.0A (I_PEAK = I_LOAD + ΔI_L/2), and DCR should be ≤72mΩ to maintain efficiency targets.

Does MP2104DQT-LF-P require external compensation components for stability?

No-MP2104DQT-LF-P uses internal compensation optimized for standard 2.2–10μH inductors and 4.7–10μF ceramic output capacitors. The datasheet confirms stable operation without external compensation networks, simplifying layout and reducing BOM count versus controllers requiring external Type-II or Type-III compensation.

How does short-circuit protection behave, and does it latch off?

Short-circuit protection is auto-recovering: oscillator frequency drops and PFET current limit reduces to ~0.7A, limiting fault current. Once the short is removed and FB voltage rises above 0.6V, normal operation resumes immediately-no manual reset or power cycle required. Thermal shutdown remains active as backup.

MP2104DQT-LF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 6-WDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.5V

Voltage - Input (Max):: 6V

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

Voltage - Output (Max):: 6V

Current - Output:: 600mA

Frequency - Switching:: 1.7MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-TQFN (3x3)

MP2104DQT-LF-P FAQ

1.How can I place an order for MP2104DQT-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MP2104DQT-LF-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 MP2104DQT-LF-P reliable?

The price and inventory of MP2104DQT-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2104DQT-LF-P is usually 5 days.

3.What payment methods are accepted for MP2104DQT-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2104DQT-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP2104DQT-LF-P?

MP2104DQT-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP2104DQT-LF-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 MP2104DQT-LF-P?

For technical support, including MP2104DQT-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2104DQT-LF-P requirements.

6.How does Aetrix verify that MP2104DQT-LF-P is sourced from the original manufacturer or authorized distributors?

All MP2104DQT-LF-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 MP2104DQT-LF-P meets industry standards.

7.What is the process for return or replacement of MP2104DQT-LF-P?

All MP2104DQT-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2104DQT-LF-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 MP2104DQT-LF-P part is unused and in its original packaging.

Return procedure for MP2104DQT-LF-P:

1.Submit a request within 90 days.

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

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