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Monolithic Power Systems Inc. MP4569GN-Z
- Part No.:
- MP4569GN-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP4569GN-Z.pdf
- Description:
- IC REG BUCK ADJ 300MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,669
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Product details
Overview
MP4569GN-Z from Monolithic Power Systems is a 75V input, 0.3A synchronous step-down DC/DC converter with integrated high-side (1.2Ω) and low-side (0.45Ω) MOSFETs, 1% FB reference tolerance at 25°C, programmable soft-start, and 3.5μA shutdown current - designed for automotive power rails, industrial distributed supplies, and battery-powered systems requiring wide VIN range and ultra-low quiescent operation.
For engineers reviewing the MP4569GN-Z datasheet, MP4569GN-Z pinout, MP4569GN-Z application, or MP4569GN-Z equivalent, this device supports precise output regulation from 1V to 0.9×VIN, features thermal shutdown and UVLO with 4.2V rising threshold, includes open-drain POK for QFN-10 only, and requires external SS capacitor and bootstrap network for stable startup and high-side gate drive.
Technical Context
The MP4569GN-Z implements a current-mode PWM control scheme with zero-current detection (ZCD), enabling discontinuous conduction mode (DCM) operation across light loads. Its internal 1V reference compares against FB voltage to regulate output, while peak current limiting (730mA typ.) and minimum on-time (120ns) constrain switching behavior under transient and high-VIN conditions.
It integrates dual MOSFET drivers with bootstrap charging via BST–SW capacitor, where BIAS pin can supply >2.9V to improve efficiency by powering internal regulators independently of VIN. EN pin enables HIGH-logic control with 1.55V rising threshold and internal 3MΩ pull-down, supporting direct VIN connection via current-limiting resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 75V - supports 12V/24V/48V automotive and industrial bus inputs without pre-regulation. |
| Output Current | 0.3A continuous - sufficient for microcontrollers, sensors, and CAN transceivers in compact power domains. |
| Quiescent Current | 20μA active / 3.5μA shutdown - enables multi-year battery life in always-on telematics modules. |
| Feedback Reference | 1.0V ±1% at 25°C - enables accurate output setting with standard resistor dividers (e.g., 3.3V @ R4=1200kΩ, R5=523kΩ). |
| Switching FETs | HS: 1.2Ω / LS: 0.45Ω - reduces conduction loss at full load, supporting >90% efficiency at 12V→3.3V/0.3A. |
| UVLO Threshold | Rising: 4.2V, Hysteresis: 0.45V - prevents erratic startup during cold-crank or brownout in automotive environments. |
| Thermal Shutdown | 175°C activation - protects silicon die during overload or poor PCB thermal design without latch-up. |
Pinout & Package
MP4569GN-Z is packaged in SOIC-8 EP (exposed pad), with thermal performance optimized via backside copper connection. Pin functions are electrically identical to QFN-10 but mapped to 8-pin layout excluding VREF and POK (QFN-only pins).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power Ground | Primary return path for high-current switch node; must connect directly to exposed pad and output capacitor negative terminal. |
| 2 (IN) | Input Supply | Accepts 4.5–75V; requires ≥10μF ceramic decoupling placed within 3mm of pin to suppress switching noise. |
| 3 (EN) | Enable Control | High-logic enable with 1.55V rising threshold; floating state disables IC via internal 3MΩ pull-down. |
| 4 (FB) | Feedback Input | Compares output divider voltage against internal 1V reference; sensitive to noise - route away from SW node. |
| 5 (SS) | Soft-Start Control | Accepts external capacitor (e.g., 100nF → 20ms ramp); overrides reference during startup to prevent output overshoot. |
| 6 (BIAS) | Bias Supply | Accepts 2.9–5.5V regulated output to power internal circuitry, reducing VIN current draw and improving efficiency. |
| 7 (BST) | Bootstrap Supply | Charges high-side driver via external capacitor to SW; requires 0.1μF X7R ceramic placed adjacent to pin. |
| 8 (SW) | Switch Node | Connects to inductor and internal HS/LS FETs; high di/dt path - minimize trace length and loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | Monolithic 75V-rated HS/LS MOSFETs eliminate external discrete switches and reduce BOM count by 4+ components. |
| Light-Load Frequency Scaling | Reduces switching frequency under light load to cut gate driver and switching losses - extends battery runtime. |
| Programmable Soft-Start | External SS capacitor sets controlled output ramp time, preventing inrush current and system reset during power-up. |
| Robust Protection Suite | Includes thermal shutdown, input UVLO, FB overvoltage protection (1.05V), and short-circuit foldback via current limit. |
| Automotive-Ready Bias Architecture | BIAS pin allows efficient use of regulated output voltage to power internal logic - avoids VIN dropout inefficiency. |
Applications
| Automotive Body Control Module | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powers MCU, LIN transceiver, and door lock actuator from 12V battery with cold-crank immunity down to 4.5V. IC Role / Device Role / Timing Role: Primary 3.3V/0.3A buck regulator supplying core logic and interface ICs in BCM subassembly. Use Value: 3.5μA shutdown current preserves battery during vehicle sleep mode; UVLO hysteresis prevents cycling during engine start. | Use Scenario: Converts 24V field bus to 5V for analog sensor signal conditioning and wireless MCU in predictive maintenance node. IC Role / Device Role / Timing Role: Isolated secondary-side DC/DC stage delivering stable rail to precision ADC and RF SoC. Use Value: 75V max input withstands 24V system surges up to ISO 7637-2 Pulse 1/2; 1% FB tolerance ensures <±2% output accuracy over temperature. |
| Distributed Battery Backup Supply | Telematics GPS Tracker Power |
Use Scenario: Regulates 48V telecom backup battery to 3.3V for real-time clock, memory, and low-power MCU during AC failure. IC Role / Device Role / Timing Role: Standby power manager maintaining critical functions when primary supply drops below 4.5V. Use Value: 20μA quiescent current enables >5-year runtime on single 3.6V LiSOCl₂ cell; thermal shutdown prevents fault propagation. | Use Scenario: Supplies 3.3V to GPS module, cellular modem, and accelerometer in vehicle tracking unit powered by 12V lead-acid battery. IC Role / Device Role / Timing Role: Main system regulator handling load transients from modem burst transmission and GPS acquisition. Use Value: ZCD-based DCM control delivers fast load-step response (<10μs recovery); BIAS pin improves efficiency by 3–5% vs. VIN-only biasing. |
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 |
|---|---|---|---|
| MPQ4569GD-AEC1-Z | AEC-Q100 Grade 1 qualified; identical electrical specs but qualified for automotive under-hood use (-40°C to +125°C junction). | Required for safety-critical automotive ECUs; same PCB layout but higher qualification cost and longer lead time. | Select when automotive qualification is mandated - no redesign needed beyond documentation and sourcing. |
| LM5164QPWPRQ1 | 65V max input, 0.3A, 1.5MHz fixed frequency; no BIAS pin; 2.5μA shutdown current; requires external HS/LS MOSFETs. | Better suited for space-constrained designs needing higher fSW; lacks integrated FETs and bias optimization for efficiency. | Choose if board area is constrained and external FETs are acceptable; avoid if 75V surge margin or BIAS-driven efficiency is required. |
Compared with MP4569GN-Z, MPQ4569GD-AEC1-Z adds automotive qualification without altering functionality, while LM5164QPWPRQ1 trades integration and voltage headroom for higher switching frequency and lower shutdown current - making MP4569GN-Z optimal for unqualified but demanding 75V industrial/battery applications.
Availability
MP4569GN-Z is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, distributed battery backup systems, and telematics trackers requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP4569GN-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP4569 product line targets high-voltage DC/DC conversion in harsh environments - emphasizing wide input range, low IQ, integrated power stages, and robust protection for automotive and industrial edge devices.
FAQ
What is the maximum recommended input voltage for continuous operation?
The MP4569GN-Z supports continuous operation up to 75V input, with absolute maximum rating of +80V on the IN pin. Operation above 75V violates recommended conditions and risks premature degradation. The 4.5–75V range ensures reliable function across automotive cold-crank (4.5V) and load-dump (up to 60V) events per ISO 7637-2.
Can the MP4569GN-Z be used without connecting the BIAS pin?
Yes - the MP4569GN-Z operates without BIAS connection by using VIN to power internal circuitry. However, connecting BIAS to a regulated 2.9–5.5V source (e.g., output rail) reduces input current consumption by ~15% and improves full-load efficiency by 2–3%, especially at high VIN. Leaving BIAS unconnected is acceptable for non-efficiency-critical designs.
Does MP4569GN-Z support adjustable switching frequency?
No - the MP4569GN-Z does not offer user-adjustable switching frequency. Its frequency varies dynamically with load, input, and output conditions (typically 200–600kHz). Frequency scaling is automatic: it decreases under light load to reduce losses and increases near peak current to maintain regulation - no external resistor or capacitor sets fSW.
Is the SOIC-8 EP package thermally equivalent to the QFN-10 package?
No - the SOIC-8 EP has θJA = 48°C/W versus QFN-10's 50°C/W, giving slightly better ambient-to-junction thermal resistance. However, the QFN-10 exposes a larger thermal pad (3mm × 3mm vs. SOIC-8 EP's smaller EP area), offering superior heat spreading when soldered to large copper planes. For >0.25A continuous loads, QFN-10 is preferred unless SOIC-8 layout constraints dominate.
How is power-good (POK) implemented in MP4569GN-Z?
The MP4569GN-Z does not include POK functionality - it is exclusive to the QFN-10 variant (MP4569GQ-Z). The SOIC-8 EP package (MP4569GN-Z) omits both POK and VREF pins. For power-good monitoring, external circuitry (e.g., TLV431 comparator with resistor divider) must be added to the FB node or output rail.
What is the minimum output voltage achievable with MP4569GN-Z?
The minimum regulated output voltage is 1.0V, set by the internal feedback reference. This is fixed and cannot be lowered via external components. Output voltages below 1.0V are unsupported and will not regulate - attempting such configurations results in uncontrolled duty cycle and potential instability or overcurrent.
Does MP4569GN-Z require an external bootstrap diode?
No - the MP4569GN-Z integrates a bootstrap charging circuit that uses an internal PMOS pass transistor to charge the BST capacitor from VIN when SW is low. An external diode is unnecessary and would interfere with the internal charging path. Only a 0.1μF ceramic capacitor between BST and SW is required, placed adjacent to the IC.
MP4569GN-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 67.5V
- Current - Output:
- 300mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
MP4569GN-Z FAQ
1.How can I place an order for MP4569GN-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4569GN-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 MP4569GN-Z reliable?
The price and inventory of MP4569GN-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4569GN-Z is usually 5 days.
3.What payment methods are accepted for MP4569GN-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4569GN-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4569GN-Z?
MP4569GN-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4569GN-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 MP4569GN-Z?
For technical support, including MP4569GN-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4569GN-Z requirements.
6.How does Aetrix verify that MP4569GN-Z is sourced from the original manufacturer or authorized distributors?
All MP4569GN-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 MP4569GN-Z meets industry standards.
7.What is the process for return or replacement of MP4569GN-Z?
All MP4569GN-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4569GN-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 MP4569GN-Z part is unused and in its original packaging.
Return procedure for MP4569GN-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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