My Inquiry
My Account
Monolithic Power Systems Inc. MP38874DL-LF-Z
- Part No.:
- MP38874DL-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MP38874DL-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 8A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,787
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP38874DL-LF-Z from Monolithic Power Systems is a monolithic synchronous step-down DC/DC converter with integrated 42mΩ high-side MOSFET and external low-side gate driver, delivering 8A continuous output current across 4.5V–21V input range, fixed 600kHz switching frequency, and adjustable 0.8V–15V output voltage - deployed in flat-panel TV power rails and broadband communication PoL stages.
For engineers reviewing the MP38874DL-LF-Z datasheet, MP38874DL-LF-Z pinout, MP38874DL-LF-Z application, or MP38874DL-LF-Z equivalent, key selection criteria include its synchronizable clock interface (300kHz–1.4MHz), cycle-by-cycle overcurrent protection, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors without external compensation.
Technical Context
The MP38874 operates in fixed-frequency peak-current-mode control with internal 0.808V reference and 40× error amplifier gain, enabling fast transient response and stable regulation under dynamic load steps. Its architecture integrates a 5V internal regulator for biasing the gate driver and supports bootstrap-based floating drive for external synchronous rectification.
Functional blocks include a dedicated EN/SYNC pin that serves dual roles - logic-level enable/disable and external clock synchronization via rising-edge alignment - while the FB pin implements frequency foldback below 250mV to prevent current-limit runaway during short-circuit faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 21V - supports wide-range industrial and consumer DC inputs including 12V and 19V adapter rails. |
| Output Current | 8A continuous - enables single-chip replacement of multi-phase controllers in space-constrained PoL designs. |
| Switching Frequency | Fixed 600kHz, synchronizable to 300kHz–1.4MHz - allows EMI tuning and multi-rail phase interleaving. |
| Feedback Reference | 0.808V ±1.6% - sets output accuracy and enables precise resistor-divider programming from 0.8V to 15V. |
| High-Side RDS(on) | 42mΩ - limits conduction loss at full load, supporting >95% efficiency at 12VIN/3.3VOUT. |
| Thermal Shutdown | 150°C with 140°C hysteresis - provides self-recovery protection without latch-off, suitable for intermittent overload conditions. |
| Power Good Threshold | 0.74V with 40mV hysteresis - delivers reliable rail-valid signaling for system sequencing and fault monitoring. |
Pinout & Package
MP38874DL-LF-Z is housed in a thermally enhanced 3mm × 4mm, 14-pin QFN package with exposed thermal pad on the underside for PCB-level heat dissipation. θJA = 45°C/W and θJC = 10°C/W on a 4-layer JEDEC-standard board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistor divider output; regulates VOUT by comparing against 0.808V internal reference. |
| 2 PG | Power Good Open-Drain Output | Asserts low when VOUT falls >10% below nominal; requires external 100kΩ pull-up to VCC or VOUT. |
| 3 EN/SYNC | Enable & External Clock Input | Pull ≥1.2V to enable; apply 300kHz–1.4MHz square wave for synchronization; <0.4V disables regulator. |
| 4,5,6 IN | Main Input Supply | Accepts 4.5V–21V unregulated input; three parallel pins reduce trace inductance and IR drop. |
| 7 N/C | No Connect | Internally unused; must remain floating or grounded per layout guidelines - no external connection. |
| 8,9,10 SW | Switch Node Output | Drives external inductor; connects to source of external low-side MOSFET and BST capacitor anode. |
| 11 BST | Bootstrap Capacitor Terminal | Forms floating supply for low-side gate driver; requires 0.1–1µF ceramic cap between BST and SW. |
| 12 VCC | Internal Regulator Output | 5V bias rail for gate driver; decoupled with 1µF ceramic capacitor to GND for noise immunity. |
| 13 BG | Bottom Gate Driver Output | Drives gate of external synchronous MOSFET; sink/source impedances 1–2Ω / 4–5.5Ω ensure fast turn-on/off. |
| 14 GND | Power Ground Reference | Primary return path for feedback, control, and power circuits; must be routed outside high-di/dt paths. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronizable switching frequency | Supports EMI reduction and multi-rail coordination via external clock injection up to 1.4MHz. |
| Integrated 42mΩ high-side MOSFET | Eliminates need for external high-side switch while maintaining >95% efficiency at 8A load. |
| Cycle-by-cycle overcurrent protection | Detects per-cycle inductor current exceeding 9.5A threshold, preventing MOSFET failure during shorts. |
| Stable with low-ESR ceramic output caps | Enables compact, high-reliability output filtering without tantalum or electrolytic capacitors. |
| Internal soft-start with 0–1.2V ramp | Prevents output overshoot and inrush current spikes during power-up without external timing components. |
Applications
| Flat Panel Television Power Rails | Digital Set-Top Box Core Supply |
|---|---|
|
Use Scenario: Providing stable 3.3V/5V rails for SoC, memory, and video processing ICs in 4K UHD TVs with tight thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing point-of-load conversion from 12V/19V bus to low-voltage logic rails. Use Value: Delivers 8A continuous current in 3mm×4mm footprint, reducing board area vs. discrete solutions while maintaining <±1% output regulation. |
Use Scenario: Generating 1.2V core voltage for MPEG-4 decoding SoCs and 3.3V I/O supply in cable/satellite STBs operating 24/7. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with programmable soft-start and power-good signaling for safe system boot. Use Value: Achieves >93% efficiency at full load with minimal thermal rise, enabling fanless enclosure design and extended product lifetime. |
| Broadband Communications Equipment | Personal Video Recorder (PVR) Storage Subsystem |
|
Use Scenario: Powering Ethernet PHYs, RF front-ends, and packet processors in DOCSIS 3.1 cable modems and fiber ONTs. IC Role / Device Role / Timing Role: Synchronized buck converter sharing clock with other rails to minimize conducted EMI in dense signal-processing modules. Use Value: External clock sync capability enables deterministic switching alignment across multiple converters, easing FCC Class B compliance. |
Use Scenario: Supplying 5V/12V to SATA HDDs and 3.3V to flash controllers in DVR/PVR units with variable disk activity profiles. IC Role / Device Role / Timing Role: Robust PoL regulator with thermal shutdown and frequency foldback to survive HDD spin-up current surges. Use Value: Cycle-by-cycle OCP and 150°C thermal cutoff prevent damage during repeated 2–3A inrush events from mechanical drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 4A rated, 20V max input, no external gate driver - fully integrated dual-MOSFET solution. | Limited to lower-current applications; lacks BST/BG pins and sync capability. | Select when board space is critical and load ≤4A; not suitable for 8A or synchronized multi-rail systems. |
| RT7295BGJ8F | 8A rated, 23V max input, built-in low-side MOSFET - eliminates external sync FET but fixes VOUT range to 0.6–5.5V. | Cannot support >5.5V outputs; no BST/BG flexibility for custom FET optimization. | Choose for cost-sensitive 3.3V/5V-only designs where external FET selection is unnecessary. |
Compared with MP38874DL-LF-Z, MP2315DJ-LF-Z trades current capacity and gate-drive flexibility for integration density, while RT7295BGJ8F sacrifices output voltage range and external FET control to achieve single-chip simplicity - making MP38874DL-LF-Z optimal for high-current, multi-rail, and customizable power architectures.
Availability
MP38874DL-LF-Z is available at Aetrix Electronics and suitable for flat panel television power rails, digital set-top box core supplies, and broadband communications equipment requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MP38874DL-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 Kirkland, WA, with global design and support operations.
The MP38874 belongs to MPS's high-current synchronous buck controller product line, engineered for space-constrained, high-efficiency point-of-load conversion in consumer and communications infrastructure where thermal performance and EMI control are critical.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP38874DL-LF-Z is stable with low-ESR ceramic capacitors; a minimum of 22µF X5R/X7R type is recommended at the output. Layout best practices require placing these capacitors close to the SW and GND pins, with parallel 10µF + 2.2µF values improving high-frequency ripple suppression across load transients.
Can the MP38874DL-LF-Z operate without an external bootstrap diode?
Yes - the internal bootstrap charging circuit functions without an external diode for most applications. An external IN4148 diode is only recommended when VOUT = 3.3V or 5V and duty cycle exceeds 65%, to improve BST capacitor recharge efficiency and sustain gate drive strength under heavy load.
How does the EN/SYNC pin behave during synchronization mode?
When an external clock is applied to EN/SYNC, the internal 600kHz oscillator locks to the rising edge of that signal. The part remains enabled as long as the external clock amplitude exceeds 1.2V; if the clock stops or drops below 0.4V, the device disables after 5µs, entering ultra-low-quiescent shutdown mode (<10µA).
What is the purpose of the N/C pin (Pin 7)?
Pin 7 is internally unconnected and must not be tied to any voltage or signal. It may be left floating or connected to GND per PCB layout guidelines to maintain copper balance and thermal symmetry - but it carries no electrical function and must never be used as a ground tie point for sensitive analog circuits.
Does the MP38874DL-LF-Z support forced PWM or power-save mode?
No - the MP38874DL-LF-Z operates exclusively in fixed-frequency continuous conduction mode (CCM) with peak-current control. It does not feature pulse-skipping, burst-mode, or forced-PWM selection; light-load efficiency relies on low quiescent current (1.1mA) and optimized gate drive impedance rather than mode switching.
How is thermal performance affected by the exposed pad soldering?
The exposed thermal pad is electrically connected to GND and is essential for thermal conduction. For θJA = 45°C/W performance, the pad must be soldered to a minimum 200mm² copper pour with ≥4 thermal vias (0.3mm diameter) to inner ground layers. Inadequate pad connection raises junction temperature by up to 35°C at full 8A load.
MP38874DL-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 14-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):
- 4.5V
- Voltage - Input (Max):
- 21V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 8A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MP38874DL-LF-Z FAQ
1.How can I place an order for MP38874DL-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP38874DL-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 MP38874DL-LF-Z reliable?
The price and inventory of MP38874DL-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 MP38874DL-LF-Z is usually 5 days.
3.What payment methods are accepted for MP38874DL-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP38874DL-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP38874DL-LF-Z?
MP38874DL-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP38874DL-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 MP38874DL-LF-Z?
For technical support, including MP38874DL-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP38874DL-LF-Z requirements.
6.How does Aetrix verify that MP38874DL-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP38874DL-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 MP38874DL-LF-Z meets industry standards.
7.What is the process for return or replacement of MP38874DL-LF-Z?
All MP38874DL-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP38874DL-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 MP38874DL-LF-Z part is unused and in its original packaging.
Return procedure for MP38874DL-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP38874DL-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…
