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

Monolithic Power Systems Inc. MP1567DQ-LF-Z

Name: MP1567DQ-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP1567DQ-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP1567DQ-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 10-VFDFN Exposed Pad

Datasheet:: MP1567DQ-LF-Z.pdf

Description:: IC REG BUCK ADJ 1.2A 10QFN

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Product details

Overview

MP1567DQ-LF-Z from Monolithic Power Systems is a 1.2A, 800kHz synchronous step-down DC/DC converter in a 3mm × 3mm QFN-10 package, designed for space-constrained low-voltage systems. It operates from 2.6V to 6V input, delivers regulated output as low as 0.9V (e.g., 1.8V @ 1.2A), achieves >90% efficiency via integrated 220mΩ high-side and 270mΩ low-side MOSFETs, and includes cycle-by-cycle current limiting, soft-start, UVLO, and thermal shutdown - deployed in handheld computers and digital video cameras.

For engineers reviewing the MP1567DQ-LF-Z datasheet, MP1567DQ-LF-Z pinout, MP1567DQ-LF-Z application, or MP1567DQ-LF-Z equivalent, key selection criteria include its 800kHz fixed-frequency operation, internal power switches eliminating external FETs, 0.9V feedback reference enabling precise output setting, and QFN thermal performance (θJA = 50°C/W) critical for thermally dense PCB layouts.

Technical Context

The MP1567DQ-LF-Z implements current-mode control with an internal transconductance error amplifier (GEA = 300 µA/V, AVEA = 400 V/V) and a 0.905V typical FB regulation voltage. Its PWM comparator compares COMP voltage against sensed inductor current to regulate duty cycle, ensuring fast transient response and stable loop behavior across load and line variations.

It integrates a 2.4V internal LDO regulator (bypassed at BP pin), a 2µA soft-start current source (SS pin), and bootstrap circuitry driving the high-side N-MOSFET gate via BS–SW capacitor. The device enforces zero-current shutdown mode and features 100mV EN hysteresis and 160°C thermal shutdown threshold.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	1.2A continuous - supports compact power rails for SoC cores or FPGA I/O banks without external current boosting.
Switching Frequency	800kHz fixed - enables use of small 1–2.2µH inductors and reduces filter component footprint vs. lower-frequency converters.
Input Voltage Range	2.6V to 6V - compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and 3.3V system rails without intermediate conversion.
Feedback Reference	0.905V (typ) - allows accurate output setting down to 0.9V using standard resistor ratios; tolerance ±30mV ensures <±3.3% output error at light load.
Efficiency	>90% at 5V_IN/1.8V_OUT/1.2A - minimizes thermal dissipation in sealed enclosures and extends battery runtime in portable devices.
Thermal Resistance	θJA = 50°C/W (QFN10) - enables 1.2A operation at +85°C ambient with minimal copper area, unlike MSOP10 (θJA = 150°C/W).
Protection Features	Cycle-by-cycle current limit (source: 1.5–2.0A, sink: 350mA), UVLO (2.2V trip, 100mV hysteresis), thermal shutdown (160°C) - prevents damage during overload, brownout, or poor heatsinking.

Pinout & Package

MP1567DQ-LF-Z uses a 3mm × 3mm, 10-pin QFN package with exposed thermal pad on underside for enhanced heat dissipation. Pin numbering follows top-view orientation with Pin 1 at bottom-left corner.

Pin/Terminal	Circuit Role	Design Meaning
1 BS	Bootstrap Supply	Drives high-side MOSFET gate; requires ≥10nF capacitor to SW to sustain gate voltage during high-duty-cycle operation.
2 IN	Main Power Input	Supplies internal LDO and power switches; must be bypassed with ≥10µF ceramic capacitor to PGND near IC.
3 SW	Switch Node	Connection point between internal high-side and low-side MOSFETs; interfaces directly to output LC filter inductor.
4 PGND	Power Ground	Source terminal of synchronous rectifier; must be tied to SGND with low-inductance connection adjacent to IC.
5 SGND	Signal Ground	Analog reference for FB, COMP, SS, BP; isolated from PGND except at single-point star connection near IC.
6 SS	Soft-Start Control	2µA current source charges external capacitor to linearly ramp FB threshold, limiting inrush current during startup.
7 FB	Feedback Input	Inverting input of error amplifier; connected to resistive divider from V_OUT to set regulation voltage (V_FB = 0.905V).
8 COMP	Compensation Node	Error amplifier output; external RC network sets pole-zero placement to stabilize control loop for chosen output capacitor type.
9 BP	Bypass for Internal Regulator	2.4V LDO output; requires ≥10nF capacitor to SGND; no external load permitted to avoid regulation failure.
10 EN	Enable Input	Active-high logic control (V_IL ≤ 0.4V, V_IH ≥ 1.5V); connects to IN for automatic startup or microcontroller GPIO for sequencing.

Key Features

Feature	Design Value
Synchronous rectification	Integrated 220mΩ high-side and 270mΩ low-side N-MOSFETs eliminate external diode losses, enabling >90% efficiency at 1.2A.
Fixed 800kHz switching	Enables consistent EMI filtering design and supports compact 1.5µH inductors with minimal board area impact.
0.9V feedback reference	Allows direct generation of sub-1V core supplies (e.g., 0.9V for low-power microcontrollers) using standard 1% resistors.
Zero-current shutdown mode	Reduces quiescent current to 0.5–1.0µA when EN = low, extending battery life in standby states of portable electronics.
Internal LDO regulator	2.4V BP rail powers internal circuitry; eliminates need for external bias supply while maintaining stability under input ripple.

Applications

Handheld Computers

Digital Video Cameras

Use Scenario: Powering ARM-based application processors and DDR memory I/O rails in sub-10mm-thin PDAs.

IC Role / Device Role / Timing Role: Primary buck converter delivering 1.2A at 1.8V from a 3.7V Li-ion cell, with soft-start preventing input voltage sag during boot.

Use Value: QFN thermal performance (θJA = 50°C/W) sustains full load at +70°C ambient without derating, avoiding thermal throttling.

Use Scenario: Generating clean 3.3V rail for CMOS image sensor interface and SD card controller in compact camcorders.

IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating at 800kHz to minimize conducted EMI near sensitive analog video paths.

Use Value: >90% efficiency at 1.2A reduces heat near optical modules, preserving focus calibration and sensor SNR.

SOHO Routers

Small LCD Displays

Use Scenario: Providing 1.2A at 1.2V for Wi-Fi SoC baseband processing in fanless residential gateways.

IC Role / Device Role / Timing Role: Synchronous buck converter with cycle-by-cycle current limiting protecting against PoE surge-induced overloads.

Use Value: Integrated power switches and 10-pin QFN reduce BOM count by 4 components (vs. controller+FET solution) and save 22 mm² PCB area.

Use Scenario: Supplying 1.8V/1.2A to TFT display driver ICs in automotive-grade instrument clusters with limited heatsinking.

IC Role / Device Role / Timing Role: Compact DC/DC regulator with UVLO (2.2V) ensuring reliable start-up even during cold-crank battery dips.

Use Value: Thermal shutdown at 160°C prevents latch-up during prolonged backlight-on operation in enclosed dash environments.

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
MP2101DQ-LF-Z	Lower 0.6A output current, 1.5MHz switching frequency, same QFN-10 package and 0.9V FB reference.	Targeted at ultra-compact, lower-power devices (e.g., Bluetooth headsets); insufficient for 1.2A loads.	Select only if load current ≤ 0.6A and higher f_SW is needed to shrink inductor size further.
TPS62231DRYR	1.4A output, 3.6MHz f_SW, 0.8V FB reference, 6-pin WSON package - lacks integrated bootstrap diode support and has higher quiescent current (18µA).	Optimized for ultra-thin wearables requiring smallest possible inductors; not pin-compatible and requires different compensation.	Choose when board space is more constrained than thermal budget and 3.6MHz operation is acceptable for EMI profile.

Compared with MP1567DQ-LF-Z, MP2101DQ-LF-Z trades current capability for higher switching frequency in identical packaging, while TPS62231DRYR offers greater current but demands redesign of layout, compensation, and thermal management due to differing pinout and control architecture.

Availability

MP1567DQ-LF-Z is available at Aetrix Electronics and suitable for handheld computers, digital video cameras, SOHO routers, and small LCD displays requiring stable component supply across production lifecycles and temperature ranges from –40°C to +85°C.

Supply support for MP1567DQ-LF-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP1567 belongs to MPS's high-efficiency DC/DC converter product line, engineered specifically for space- and thermally constrained portable electronics requiring integrated power switches, low quiescent current, and robust protection in miniature QFN packages.

FAQ

What is the minimum recommended input voltage for reliable operation?

The MP1567DQ-LF-Z specifies an absolute minimum input voltage of 2.6V per datasheet operating conditions. Below this, undervoltage lockout activates at 2.2V (with 100mV hysteresis), halting switching to protect internal circuitry. Sustained operation below 2.6V risks regulation loss and potential instability, especially under load.

Can the MP1567DQ-LF-Z drive a 1.2A load continuously at 85°C ambient?

Yes - its QFN-10 package has θJA = 50°C/W. At 1.2A output with 5V input and 1.8V output, power dissipation is ~0.4W. With 85°C ambient, junction temperature reaches ~105°C (85 + 0.4 × 50), well below the 160°C thermal shutdown threshold and within rated operating limits.

Is an external bootstrap diode required for normal operation?

No - the MP1567DQ-LF-Z self-charges the BS capacitor during low-side conduction and operates reliably without external diodes. An IN4148 is optional only for high-duty-cycle cases (e.g., V_OUT/V_IN > 65% at 3.3V/5V), where it improves high-side gate drive margin and efficiency by ~1–2%.

How is output voltage accuracy affected by FB pin bias current?

The FB input bias current is specified as –100nA at 0.9V. With a typical 10kΩ lower-divider resistor, this introduces ≤1mV offset at FB, translating to <±0.1% error in 1.8V output - negligible compared to the ±30mV FB reference tolerance (±3.3%). Accuracy is dominated by resistor tolerance and reference drift.

What is the purpose of the BP pin, and can it power external circuitry?

BP is the output of an internal 2.4V LDO that powers internal analog blocks. It must be bypassed with ≥10nF to SGND but cannot supply external current - loading BP degrades regulation stability and may cause startup failure. No external connections beyond the bypass capacitor are permitted.

Does the MP1567DQ-LF-Z support forced PWM or power-save mode?

No - it operates exclusively in forced continuous conduction mode (CCM) at 800kHz. There is no pulse-skipping or discontinuous mode; light-load efficiency drops due to fixed switching losses, but regulation remains stable and ripple predictable - beneficial for noise-sensitive analog circuits.

How does the soft-start time scale with the SS capacitor value?

Soft-start time t_SS (ms) ≈ 0.45 × C_SS (nF). A 10nF capacitor yields ~4.5ms ramp; 22nF yields ~10ms. This linear ramp controls FB threshold rise, limiting inrush current to prevent input voltage droop - critical for battery-powered systems with weak source impedance.

MP1567DQ-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 10-VFDFN 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):: 2.6V

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 0.9V

Voltage - Output (Max):: 4.5V

Current - Output:: 1.2A

Frequency - Switching:: 800kHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-QFN (3x3)

MP1567DQ-LF-Z FAQ

1.How can I place an order for MP1567DQ-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP1567DQ-LF-Z 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 MP1567DQ-LF-Z reliable?

The price and inventory of MP1567DQ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1567DQ-LF-Z is usually 5 days.

3.What payment methods are accepted for MP1567DQ-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1567DQ-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP1567DQ-LF-Z?

MP1567DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP1567DQ-LF-Z 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 MP1567DQ-LF-Z?

For technical support, including MP1567DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1567DQ-LF-Z requirements.

6.How does Aetrix verify that MP1567DQ-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP1567DQ-LF-Z 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 MP1567DQ-LF-Z meets industry standards.

7.What is the process for return or replacement of MP1567DQ-LF-Z?

All MP1567DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1567DQ-LF-Z, 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 MP1567DQ-LF-Z part is unused and in its original packaging.

Return procedure for MP1567DQ-LF-Z:

1.Submit a request within 90 days.

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

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