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Monolithic Power Systems Inc. MP7235GQBE-Z
- Part No.:
- MP7235GQBE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 13-PowerVQFN
- Datasheet:
-
MP7235GQBE-Z.pdf
- Description:
- 36V, 3A, SYNCHRONOUS BUCK INFRAR
- Quantity:
- Payment:
- Shipping:
Inventory:4,963
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Product details
Overview
MP7235GQBE-Z from Monolithic Power Systems is a synchronous buck LED driver IC optimized for infrared (IR) radiation applications, integrating high- and low-side MOSFETs (85mΩ/50mΩ RDS(ON)) to deliver 1.5A continuous and 3A peak LED current across a 4V–36V input range. It supports PWM dimming from 10Hz to 2kHz-including 30/60/120fps synchronization-and features built-in fault detection, thermal shutdown, and CISPR25 Class 5 EMI compliance for automotive-grade camera illumination systems.
For engineers reviewing the MP7235GQBE-Z datasheet, MP7235GQBE-Z pinout, MP7235GQBE-Z application, or MP7235GQBE-Z equivalent, key selection considerations include its 2.2MHz fixed switching frequency, wettable-flank QFN-13 package for automated optical inspection, valley-current OCP, and dedicated /FAULT open-drain indicator for LED short/open/thermal faults in driver monitoring systems.
Technical Context
The MP7235 operates in forced continuous conduction mode (FCCM) with peak-current-mode control, enabling stable 2.2MHz switching across full load range and minimizing output ripple at light loads. Its internal 4.9V VCC regulator powers all circuitry and supports up to 10mA external biasing.
Current regulation is achieved via a 200mV feedback reference (±4% over temperature), with fast transient response enabled by current-mode architecture and integrated soft-start (2ms). Fault protection includes valley-current OCP, LED open/short detection, and thermal shutdown with 150°C trip and 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide automotive battery and industrial supply rails without pre-regulation |
| Continuous LED Current | 1.5A - sufficient for dual-LED IR arrays in DMS and surveillance illuminators |
| Peak LED Current | 3A - enables high-intensity pulsed IR bursts at low duty cycles (e.g., 30Hz/5ms) |
| Switching Frequency | 2.2MHz (typ.) - allows compact magnetics and reduces EMI fundamental energy above AM band |
| Feedback Reference Voltage | 200mV ±4% - low-voltage sense improves accuracy and reduces I2R loss in current-sense path |
| Thermal Shutdown Threshold | 150°C - protects die during sustained overload or poor PCB thermal design |
| PWM Dimming Range | 10Hz to 2kHz - matches frame-sync requirements of 30/60/120fps imaging systems |
| EMI Compliance | CISPR25 Class 5 - validated for conducted/radiated emissions in automotive environments |
Pinout & Package
MP7235GQBE-Z is housed in a wettable-flank QFN-13 package (2.5mm × 3mm, 0.5mm pitch), enabling solder-joint inspection and improved thermal performance via exposed PGND pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 IN | Power input | Accepts 4V–36V supply; requires local ceramic decoupling and wide PCB trace for high di/dt |
| 3 NC | No connect | Internally unconnected; must remain floating per datasheet layout guidance |
| 4 /FAULT | Fault indicator | Open-drain output pulled low on LED short/open or thermal shutdown; enables system-level fault logging |
| 5 DIM | PWM dimming input | Accepts 10Hz–2kHz external clock; internal pull-down ensures safe-off state when un-driven |
| 6 FB | Current-sense feedback | 200mV reference node; connects to shunt resistor between LED− and PGND for precise ILED regulation |
| 7 VCC | Bias supply | Internal 4.9V regulator output; requires 0.1–0.22μF ceramic capacitor; supports ≤10mA external load |
| 8 AGND | Analog ground | Reference for FB, DIM, and /FAULT logic; internally tied to PGND but benefits from star-point connection |
| 9 SW | Power switch node | Drives external inductor; requires low-inductance routing and tight loop with BST and PGND |
| 10 BST | Bootstrap supply | Connects to SW via 20Ω resistor and 100nF capacitor to sustain HS-FET gate drive during conduction |
| 11–13 PGND | Power ground | High-current return path for MOSFETs and inductor; requires copper pour + multiple vias to inner ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 85mΩ/50mΩ MOSFETs | Eliminates external power switches and reduces board area by >30% vs discrete solutions |
| Wettable-flank QFN-13 | Enables automated AOI of solder joints-critical for automotive AEC-Q200-compliant production |
| CISPR25 Class 5 EMI compliance | Validated with standard EMI filters; meets OEM radiated/conducted emission limits without custom shielding |
| Valley-current over-current protection | Detects fault conditions during low-side FET conduction, improving reliability vs peak-only sensing |
| 2.2MHz fixed-frequency FCCM | Maintains constant switching rate from no-load to full-load, simplifying EMI filter design and reducing low-frequency ripple |
| LED open/short fault reporting | /FAULT pin asserts low for LED+–GND, LED+–LED−, or open-circuit conditions-enabling fail-safe system response |
Applications
| Driver Monitoring Systems (DMS) | In-Cabin IR Illumination |
|---|---|
Use Scenario: Real-time eye/gaze tracking in automotive cabins using near-IR LEDs synchronized to camera frame rate. IC Role / Device Role / Timing Role: Synchronous buck controller regulating pulsed 3A IR LED current with 30/60fps timing alignment and fault-safe shutdown. Use Value: Enables reliable pupil detection under varying ambient light while meeting ISO 26262 functional safety readiness via /FAULT signaling. |
Use Scenario: Low-noise IR illumination for occupancy detection and gesture recognition in smart vehicles and IoT appliances. IC Role / Device Role / Timing Role: High-efficiency LED driver delivering 1.5A continuous current with <2.2MHz switching to minimize audible noise and EMI coupling. Use Value: Achieves >85% efficiency at 12V input/6.4V LED stack, reducing thermal load in space-constrained enclosures. |
| Surveillance Camera IR Illuminators | Automotive Night Vision Systems |
Use Scenario: Long-range IR flood lighting for security cameras operating in 0.1–10 lux ambient conditions. IC Role / Device Role / Timing Role: Peak-current-mode buck driver supporting 3A pulsed output at 120Hz to eliminate rolling shutter artifacts in CMOS sensors. Use Value: Delivers 3× peak intensity vs continuous mode without thermal derating, extending effective illumination distance by 40%. |
Use Scenario: Adaptive IR beam shaping for pedestrian detection in ADAS night vision modules. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with open/short detection and thermal foldback, interfacing with CAN-based vehicle control units. Use Value: Ensures uninterrupted IR output during vibration/shock events via robust PGND layout and wettable-flank solder joint integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar IR LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ7235GQ-AEC1-Z | AEC-Q100 Grade 1 qualified; identical electrical specs but extended -40°C to +125°C junction rating and enhanced ESD (HBM 4kV) | Required for production automotive ECUs where qualification traceability is mandated | Select when full automotive qualification documentation and PPAP support are contractually required |
| LT3965EFE#PBF | 4-channel independent buck controller; 3.3A per channel; 2.2MHz sync capability; no integrated MOSFETs | Suitable for multi-zone IR illumination with independent dimming per LED string | Choose when system requires channel-to-channel isolation or >3A total current with flexible layout |
Compared with MP7235GQBE-Z, the MPQ7235GQ-AEC1-Z adds automotive qualification overhead without electrical benefit, while the LT3965 offers scalability at the cost of higher BOM count and layout complexity-making MP7235GQBE-Z optimal for cost-sensitive, single-string IR applications requiring proven EMI performance.
Availability
MP7235GQBE-Z is available at Aetrix Electronics and suitable for infrared driver monitoring systems, automotive night vision modules, and surveillance camera illuminators requiring stable component supply across extended temperature and EMI-sensitive environments.
Supply support for MP7235GQBE-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 power management ICs, with over two decades of expertise in DC/DC conversion, LED drivers, and motor control.
The MP7235 belongs to MPS's automotive-qualified IR LED driver product line, engineered specifically for frame-synchronized, high-reliability infrared illumination in driver assistance and machine vision systems.
FAQ
What is the minimum PWM dimming frequency supported by MP7235GQBE-Z?
The MP7235GQBE-Z supports PWM dimming down to 10Hz, enabling compatibility with slow-frame-rate imaging systems such as certain thermal or low-power surveillance cameras. This low-frequency capability is achieved without compromising stability due to its FCCM architecture and internal soft-start timing.
Does MP7235GQBE-Z require an external bootstrap diode?
No. The MP7235GQBE-Z integrates a bootstrap regulator and does not require an external diode; only a 100nF ceramic capacitor and optional 20Ω series resistor between BST and SW are needed to form the floating supply for the high-side MOSFET gate driver.
How does the /FAULT pin indicate different fault conditions?
The /FAULT pin is an open-drain output that pulls low identically for LED short-to-GND, LED short-to-LED−, LED open-circuit, and thermal shutdown events. Distinction between fault types requires external monitoring of VSW, FB, and DIM waveforms or system-level diagnostics-not hardware-decoded by the IC.
Can MP7235GQBE-Z drive a single 3.2V IR LED at 1.5A continuously?
Yes. With VIN ≥ 6.4V (accounting for dropout), the MP7235GQBE-Z delivers 1.5A continuous current to a single 3.2V IR LED. Efficiency exceeds 88% at 12V input, and thermal rise remains below 40°C on a 4-layer 2-oz PCB per MPS EVB data.
Is the QFN-13 package of MP7235GQBE-Z RoHS and halogen-free?
Yes. MP7235GQBE-Z is lead-free, halogen-free, and fully compliant with the EU RoHS directive. MPS confirms green status on its Quality Assurance portal, and the wettable-flank finish uses standard SnAgCu alloy compatible with lead-free reflow profiles.
What is the purpose of the NC pin (Pin 3) in the QFN-13 layout?
Pin 3 is a no-connect terminal-internally unconnected and electrically isolated. It must remain unconnected on the PCB; routing traces or placing vias to this pad violates MPS layout guidelines and may compromise thermal or EMI performance.
How does the MP7235GQBE-Z handle input voltage undershoot during cold-crank conditions?
The MP7235GQBE-Z features a 3.5V UVLO rising threshold with 400mV hysteresis, allowing operation down to 3.1V. During cold-crank dips below this, the IC disables switching and holds /FAULT high until VIN recovers-preventing erratic LED behavior or false fault reporting.
MP7235GQBE-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 13-PowerVQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.5A
- Frequency:
- 2.2MHz
- Dimming:
- PWM
- Applications:
- Infrared Radiation
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 13-QFN (2.5x3)
MP7235GQBE-Z FAQ
1.How can I place an order for MP7235GQBE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP7235GQBE-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 MP7235GQBE-Z reliable?
The price and inventory of MP7235GQBE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP7235GQBE-Z is usually 5 days.
3.What payment methods are accepted for MP7235GQBE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP7235GQBE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP7235GQBE-Z?
MP7235GQBE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP7235GQBE-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 MP7235GQBE-Z?
For technical support, including MP7235GQBE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP7235GQBE-Z requirements.
6.How does Aetrix verify that MP7235GQBE-Z is sourced from the original manufacturer or authorized distributors?
All MP7235GQBE-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 MP7235GQBE-Z meets industry standards.
7.What is the process for return or replacement of MP7235GQBE-Z?
All MP7235GQBE-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP7235GQBE-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 MP7235GQBE-Z part is unused and in its original packaging.
Return procedure for MP7235GQBE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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