My Inquiry
My Account
Monolithic Power Systems Inc. MP2371DG-LF-Z
- Part No.:
- MP2371DG-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP2371DG-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1.8A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,099
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP2371DG-LF-Z from Monolithic Power Systems is a monolithic 700kHz current-mode synchronous step-down DC/DC converter with integrated 0.3Ω high-side MOSFET, delivering 1.8A continuous output current across 4.5V–24V input range and adjustable 0.81V–15V output. It features cycle-by-cycle over-current protection, thermal shutdown, and stable operation with low-ESR ceramic capacitors-used in broadband communications power rails and digital entertainment system pre-regulation.
For engineers reviewing the MP2371DG-LF-Z datasheet, MP2371DG-LF-Z pinout, MP2371DG-LF-Z application, or MP2371DG-LF-Z equivalent, key selection criteria include its fixed 700kHz switching frequency, 0.1μA shutdown current, 2.5A peak current limit, 87% max duty cycle, and QFN8 (2mm × 2mm) thermally enhanced package for compact high-density PCB layouts.
Technical Context
The MP2371 operates in current-mode control with internal slope compensation, enabling fast transient response and simplified loop stability using only external R-C feedback network. Its error amplifier compares FB voltage against a precision 0.81V reference and drives PWM comparator via integrated ramp signal.
Bootstrap gate drive (BST–SW) enables high-side MOSFET operation up to 95% duty cycle; under-voltage lockout (2.5V–3.1V threshold with 150mV hysteresis) ensures reliable start-up across wide input conditions. Frequency foldback activates below 250mV FB to limit short-circuit current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports 12V/24V industrial and telecom rails without pre-regulation |
| Output Voltage Range | 0.81V to 15V - programmable via resistor divider for core logic, I/O, or analog supply domains |
| Switching Frequency | Fixed 700kHz - balances efficiency vs. EMI filtering component size; no external timing components required |
| Continuous Output Current | 1.8A - sufficient for FPGA I/O banks, SoC auxiliary rails, or multi-channel sensor interfaces |
| Internal MOSFET RDS(ON) | 0.3Ω - reduces conduction loss and thermal stress at full load in 2mm × 2mm QFN8 package |
| Shutdown Quiescent Current | 0.1μA - enables ultra-low-power standby in battery-backed or energy-harvesting systems |
| Feedback Reference Voltage | 0.810V ±2% - high-accuracy bandgap reference enables tight output regulation (<±1.5% total error) |
Pinout & Package
MP2371DG-LF-Z uses a thermally optimized 2mm × 2mm QFN8 package with exposed thermal pad (JEDEC MO-229 VCCD-3 compliant). Pin 1 identification is marked by chamfered corner or dot; exposed pad must be soldered to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 NC | No Connect | Unused pins; must remain unconnected per datasheet to avoid parasitic coupling |
| 2 SW | Switch Node | High-frequency drain node of internal MOSFET; connects to inductor and bootstrap capacitor |
| 3 IN | Input Supply | Main power input (4.5–24V); requires local 10µF ceramic decoupling close to pin |
| 4 EN | Enable Control | Active-high logic input (1.5V threshold); 0.01μA leakage enables direct MCU GPIO control |
| 5 FB | Feedback Input | Senses output voltage via resistor divider; internal 10nA bias enables high-value resistors for low quiescent loss |
| 6 GND | Power Ground | Analog/digital reference return; must tie directly to thermal pad and minimize switching current path |
| 7 BST | Bootstrap Supply | Floating gate-drive rail formed with SW–BST capacitor; enables 100% duty cycle capability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.3Ω High-Side MOSFET | Eliminates external switch and driver, reducing BOM count and layout area in space-constrained designs |
| Stable with Ceramic Output Capacitors | Supports low-ESR X5R/X7R ceramics (e.g., 22µF), avoiding costly tantalum or polymer alternatives |
| Current-Mode Control with Slope Compensation | Enables single-pole compensation and robust stability across 10:1 load transients without external Type-II/III networks |
| Frequency Foldback Protection | Reduces switching frequency during output short-circuit to limit average inductor current and thermal stress |
| Thermal Shutdown with Hysteresis | Shuts down at 150°C junction temperature and restarts after ~20°C cooldown, preventing latch-up in overload conditions |
Applications
| Broadband Communications Equipment | Digital Entertainment Systems |
|---|---|
Use Scenario: Powering Ethernet PHYs, SFP+ modules, and baseband processors in 1U edge routers. IC Role / Device Role / Timing Role: Primary 3.3V/1.8V point-of-load regulator with fast load-step response to handle burst traffic-induced current spikes. Use Value: 700kHz switching enables compact 4.7µH inductors and 22µF ceramic output caps, meeting IPC-7351 density requirements. |
Use Scenario: Supplying HDMI transmitter ICs, audio DACs, and video decoder SoCs in set-top boxes and streaming sticks. IC Role / Device Role / Timing Role: Secondary buck stage regulating clean 1.2V core and 3.3V I/O rails from 12V intermediate bus. Use Value: 0.1μA shutdown current extends standby battery life in remote-controlled devices with wake-on-HDMI-CEC. |
| Distributed Power Systems | Battery Charger Pre-Regulator |
Use Scenario: Local regulation for isolated DC-DC modules in industrial PLC backplanes with 24V input bus. IC Role / Device Role / Timing Role: Non-isolated pre-regulator stepping 24V down to 5V/3.3V before downstream isolated converters. Use Value: Wide 4.5–24V input range accommodates brownout and surge conditions without external LDO buffering. |
Use Scenario: Generating constant-current charging voltage for Li-ion packs in portable medical monitors. IC Role / Device Role / Timing Role: Adjustable-output buck stage setting precise 4.2V or 8.4V charge voltage prior to linear charger IC. Use Value: 0.81V feedback reference enables <±1% output accuracy over temperature, critical for battery longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT6220AGQW | 600kHz fixed frequency, 2A continuous rating, 0.22Ω RDS(ON), no BST pin - uses integrated bootstrap capacitor | Lacks external BST control; less flexible for high-duty-cycle (>85%) designs requiring external diode enhancement | Preferred where board space is tighter and 600kHz EMI profile is acceptable; not drop-in due to different pinout and control architecture |
| TPS561201 | 650kHz frequency, 1.5A continuous, 0.125Ω RDS(ON), D-CAP2 control - no external compensation required | Higher efficiency at light loads but lower max current; lacks frequency foldback and has narrower 4.5–17V input range | Best for cost-sensitive consumer apps needing minimal external parts; unsuitable for 24V input or >1.5A sustained loads |
Compared with RT6220AGQW and TPS561201, MP2371DG-LF-Z offers superior 24V input tolerance, explicit BST control for efficiency tuning, and stronger short-circuit protection via frequency foldback-making it optimal for industrial and telecom applications demanding robustness over minimal BOM count.
Availability
MP2371DG-LF-Z is available at Aetrix Electronics and suitable for broadband communications equipment, digital entertainment systems, and distributed power systems requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for MP2371DG-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 power ICs, headquartered in California and serving global industrial, telecom, and consumer markets since 1997.
The MP2371 belongs to MPS's mainstream buck converter product line, designed specifically for space-constrained, medium-power DC/DC conversion in 4.5–24V input environments where thermal efficiency, reliability, and ease of design-in are prioritized over ultra-low quiescent current.
FAQ
What is the maximum recommended PCB copper area for the exposed thermal pad?
The exposed thermal pad on MP2371DG-LF-Z must be soldered to a minimum 100 mm² solid copper pour connected to system ground. For continuous 1.8A operation at 24V input, a 200 mm² pad with 4–6 thermal vias (0.3mm diameter, spaced ≤1mm apart) to inner-layer ground planes is recommended to maintain junction temperature below 125°C.
Can the MP2371DG-LF-Z operate without an external bootstrap capacitor?
No. An external 0.1µF–1µF ceramic capacitor between BST and SW pins is mandatory to provide gate-drive voltage for the internal high-side MOSFET. Omitting it prevents proper switch turn-on and causes immediate functional failure or erratic regulation.
Does the MP2371DG-LF-Z support forced PWM mode at light loads?
No. The MP2371 operates exclusively in current-mode PWM with automatic pulse-skipping at light loads. It does not offer a dedicated MODE pin or external control to force continuous conduction mode (CCM); light-load efficiency relies on reduced switching frequency and low quiescent current (0.8mA typical).
What is the minimum output voltage achievable with standard 1% resistors?
With the 0.81V internal reference and standard E96 1% resistors, the lowest stable output is 0.81V (achieved when R2 = 0Ω and R1 omitted). Practical minimums start at 1.2V using 10kΩ/10kΩ divider (0.5× reference), limited by resistor tolerance and FB pin bias current error.
Is an external Schottky diode required in the MP2371DG-LF-Z application circuit?
No. The MP2371DG-LF-Z integrates both high-side and synchronous rectifier MOSFETs; no external diode is needed. The "D3" shown in typical schematics is legacy notation from non-synchronous versions - this part uses fully synchronous rectification for >90% efficiency at mid-to-high loads.
How does the frequency foldback feature behave during output short-circuit?
When FB voltage drops below 250mV (indicating severe overload or short), the oscillator frequency reduces from 700kHz to ~230kHz. This lowers average inductor current and power dissipation, limiting junction temperature rise while maintaining detectable switching activity for fault recovery.
What is the recommended input capacitor configuration for 24V input with 1.8A load?
Use one 10µF X7R 25V ceramic capacitor placed within 2mm of IN and GND pins, plus a 100nF X7R 50V capacitor in parallel. This combination suppresses high-frequency switching noise and handles peak input current surges without exceeding ripple current ratings.
MP2371DG-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-TFDFN 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):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 0.81V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 1.8A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (2x2)
MP2371DG-LF-Z FAQ
1.How can I place an order for MP2371DG-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2371DG-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 MP2371DG-LF-Z reliable?
The price and inventory of MP2371DG-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 MP2371DG-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2371DG-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2371DG-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2371DG-LF-Z?
MP2371DG-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2371DG-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 MP2371DG-LF-Z?
For technical support, including MP2371DG-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2371DG-LF-Z requirements.
6.How does Aetrix verify that MP2371DG-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2371DG-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 MP2371DG-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2371DG-LF-Z?
All MP2371DG-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2371DG-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 MP2371DG-LF-Z part is unused and in its original packaging.
Return procedure for MP2371DG-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP2371DG-LF-Z Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
