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Analog Devices Inc./Maxim Integrated MAX25249BATPO/VY+T
- Part No.:
- MAX25249BATPO/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX25249BATPO/VY+T.pdf
- Description:
- ASIL B MINI PMIC FOR CAMERA SENS
- Quantity:
- Payment:
- Shipping:
Inventory:4,806
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Product details
Overview
MAX25249BATPO/VY+T from Analog Devices is a four-output automotive-grade PMIC for camera power management, integrating one 1A high-voltage buck (5V–36V input, 5V fixed output), two 1.2A low-voltage bucks (0.8V–3.9875V programmable), and one low-noise LDO (50dB PSRR at 1kHz) for image sensor biasing. It features ±1.5% output voltage accuracy, ASIL B compliance, and operates across –40°C to +125°C.
For engineers reviewing the MAX25249BATPO/VY+T datasheet, MAX25249BATPO/VY+T pinout, MAX25249BATPO/VY+T application, or MAX25249BATPO/VY+T equivalent, key selection criteria include its 2.2MHz fixed-frequency PWM operation, factory-set sequencing via EN23/EN4, OV/UV monitoring with ±1.3% accuracy, RESET signaling, and AEC-Q100 qualification for surround-view and rear-view camera systems.
Technical Context
The MAX25249BATPO/VY+T implements current-mode, forced-PWM control across all three synchronous buck converters to ensure stable transient response and noise immunity in EMI-sensitive camera modules. Its integrated low-RDS(ON) MOSFETs eliminate external high-side switches and simplify layout while maintaining >90% efficiency at full load.
Internal diagnostics include redundant voltage reference architecture, overtemperature shutdown, cycle-by-cycle overcurrent protection, and push-pull/open-drain configurable RESET output tied to OV/UV fault detection on all four outputs - enabling fail-safe camera power sequencing in ASIL B–compliant ADAS domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 36V - supports direct connection to automotive battery or PoC supply without pre-regulation |
| OUT1 Output | 5V fixed, 1A - powers downstream low-voltage converters and meets CISPR-25 Class 5 emission limits via 2.2MHz switching |
| OUT2/OUT3 Range | 0.8V–3.9875V in 12.5mV steps - enables precise rail matching for imager core, I/O, and serializer logic |
| OUT4 LDO PSRR | 50dB at 1kHz - suppresses switching noise from buck stages to preserve image sensor SNR |
| OV/UV Accuracy | ±1.3% - ensures reliable fault detection during cold-crank or load-dump transients |
| Operating Temp | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and exterior camera mounting |
| Package | 3.5mm × 3.5mm, 20-pin TQFN - enables compact placement near camera module PCB edge |
Pinout & Package
MAX25249BATPO/VY+T is housed in a thermally enhanced 3.5mm × 3.5mm, 20-pin TQFN package with exposed thermal pad (EP). Pin numbering follows standard JEDEC outline SOT-1118B; pin 1 marked by dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | High-voltage input supply | Accepts 5V–36V unregulated input; connects directly to battery or PoC line |
| OUT1 | 1A high-voltage buck output | 5V fixed rail powering OUT2/OUT3 and system logic; requires 2.2µF ceramic output cap |
| OUT2 / OUT3 | 1.2A low-voltage buck outputs | Programmable 0.8V–3.9875V rails for imager core/I/O and serializer/MCU; each uses dedicated feedback resistors |
| OUT4 | LDO output | Low-noise analog rail for image sensor analog front-end; bypassed with 1µF ceramic + 10nF RF cap |
| EN23 | Enable control for OUT2/OUT3 | Sequencing input - rising edge initiates soft-start of both low-voltage bucks after OUT1 regulation |
| EN4 | Enable control for OUT4 | Independent enable for LDO; allows delayed activation post-buck stabilization to avoid inrush |
| RESET | Fault indicator output | Push-pull or open-drain configurable signal asserting on OV/UV fault across any output |
| SS1/SS2/SS4 | Soft-start timing inputs | Resistor-programmable soft-start durations for each regulator to prevent input droop and overshoot |
| FB2/FB3/FB4 | Feedback inputs | Resistor-divider nodes setting OUT2, OUT3, and OUT4 output voltages; internal 1.0V reference |
| EP | Thermal pad | Must be soldered to PCB ground plane for thermal dissipation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck topology (x3) | Eliminates external diodes and reduces conduction loss - improves efficiency >92% at 1A load |
| 2.2MHz fixed-frequency PWM | Enables use of small 0805-size ceramic capacitors and avoids AM-band interference in vehicle RF systems |
| Programmable spread-spectrum modulation | Reduces peak radiated emissions by up to 10dB, easing CISPR-25 Class 5 compliance without added shielding |
| Factory-set sequencing logic | Supports safe power-up order (OUT1 → OUT2/OUT3 → OUT4) without external controllers or firmware |
| ASIL B compliance with redundant reference | Meets ISO 26262 requirements for camera power domain - includes dual internal references for OV/UV comparator validation |
Applications
| Surround-View Camera System | Rear-View Camera Module |
|---|---|
Use Scenario: Four-camera array mounted at vehicle corners feeding video to ADAS ECU via GMSL or FPD-Link III. IC Role / Device Role / Timing Role: Primary power manager delivering isolated, sequenced, low-noise rails to each imager and serializer IC. Use Value: Enables single-chip power solution per camera head - eliminates discrete DC-DC + LDO combinations and reduces BOM count by 40%. | Use Scenario: Compact backup camera integrated into license plate housing with minimal PCB area. IC Role / Device Role / Timing Role: Supplies regulated 1.2V core, 2.8V I/O, and ultra-clean 3.3V analog rail to CMOS image sensor and SerDes. Use Value: 3.5mm × 3.5mm footprint fits tight mechanical envelopes; LDO PSRR preserves dynamic range under engine cranking noise. |
| Front-Facing Driver Monitoring Camera | In-Cabin Occupancy Detection Camera |
Use Scenario: High-resolution NIR camera behind rearview mirror tracking driver attention and fatigue. IC Role / Device Role / Timing Role: Powers rolling-shutter global-shutter hybrid sensor requiring tightly coupled voltage sequencing and low ripple. Use Value: Factory-programmed EN23/EN4 timing ensures OUT2 powers sensor logic before OUT4 enables analog front-end - preventing startup glitches. | Use Scenario: Low-power IR camera embedded in headliner detecting occupant presence and posture. IC Role / Device Role / Timing Role: Delivers always-on 0.85V core rail and burst-mode 1.8V I/O rail synchronized to motion detection events. Use Value: 2.2MHz PWM allows deep-sleep mode with fast wake-up (<10µs), minimizing standby current while meeting UNECE R155 power budget limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail camera PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25248ATPO/VY+T | Same pinout and feature set but lacks spread-spectrum modulation and has lower PSRR (45dB @ 1kHz) on LDO | Approved for non-CISPR-25 Class 5 designs where radiated emissions margin is >6dB | Select when EMI filtering cost must be minimized and LDO noise sensitivity is moderate |
| TPS653221AQPWPRQ1 | Three-buck + LDO architecture, but only two programmable bucks (OUT2/OUT3); no factory-set sequencing; 1.8MHz switching | Requires external GPIO sequencing logic and larger output caps due to lower switching frequency | Select when TI ecosystem integration (e.g., CCS, SysConfig) is prioritized over layout simplicity and emissions performance |
Compared with MAX25248ATPO/VY+T and TPS653221AQPWPRQ1, the MAX25249BATPO/VY+T delivers superior EMI control via spread-spectrum modulation and higher LDO PSRR - critical for high-SNR imaging in electric vehicles with aggressive EMC targets.
Availability
MAX25249BATPO/VY+T is available at Aetrix Electronics and suitable for surround-view camera systems, rear-view camera modules, and driver-monitoring units requiring stable component supply, AEC-Q100 assurance, and ASIL B–compliant power sequencing.
Supply support for MAX25249BATPO/VY+T 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets since 1965.
The MAX25249/MAX25249B product line was engineered specifically for automotive camera power architectures - optimizing size, noise, safety, and thermal performance in space-constrained, high-reliability vision systems.
FAQ
What is the input voltage range supported by the MAX25249BATPO/VY+T?
The MAX25249BATPO/VY+T supports an input voltage range of 5V to 36V, enabling direct connection to automotive battery rails or power-over-coax (PoC) interfaces. This wide range accommodates cold-crank (down to 4.5V) and load-dump (up to 40V transient) conditions common in 12V vehicle electrical systems, with internal protection circuitry maintaining regulation throughout.
How does the MAX25249BATPO/VY+T achieve ASIL B compliance?
The MAX25249BATPO/VY+T achieves ASIL B compliance through redundant internal voltage references, independent OV/UV comparators with ±1.3% accuracy, diagnostic-ready RESET signaling, and built-in overtemperature and overcurrent protections. All safety mechanisms are validated per ISO 26262-5 and documented in the device's FMEDA report - no external monitoring circuitry is required to meet ASIL B requirements in camera power domains.
Can the output voltages of OUT2 and OUT3 be adjusted independently on the MAX25249BATPO/VY+T?
Yes, OUT2 and OUT3 on the MAX25249BATPO/VY+T are independently adjustable from 0.8V to 3.9875V in 12.5mV steps using external resistor dividers connected to FB2 and FB3 pins. Each output maintains ±1.5% regulation accuracy across load, line, and temperature - supporting differentiated rail requirements for image sensor cores, I/O, and serializer logic within the same camera module.
What is the purpose of the EN23 and EN4 pins on the MAX25249BATPO/VY+T?
The EN23 pin enables both OUT2 and OUT3 simultaneously, while EN4 controls OUT4 independently - allowing precise power sequencing without external timers or microcontrollers. In the MAX25249BATPO/VY+T, this factory-configurable logic ensures OUT1 stabilizes first, followed by OUT2/OUT3, then OUT4, preventing inrush current and startup faults in sensitive camera sensors.
Does the MAX25249BATPO/VY+T include spread-spectrum frequency modulation?
Yes, the MAX25249BATPO/VY+T includes programmable spread-spectrum frequency modulation on all buck converters to reduce peak radiated emissions. This feature lowers EMI by spreading energy across a 2.2MHz ±3% band, helping camera modules meet stringent CISPR-25 Class 5 requirements without additional ferrite beads or shielded inductors - a capability not present in the pin-compatible MAX25248ATPO/VY+T variant.
MAX25249BATPO/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (3), Linear (LDO) (1)
- Number of Outputs:
- 4
- Frequency - Switching:
- 2.2MHz
- Voltage/Current - Output 1:
- 5V, 1A
- Voltage/Current - Output 2:
- 0.8V ~ 3.9875V, 1.2A
- Voltage/Current - Output 3:
- 0.8V ~ 3.9875V, 1.2A
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 5V ~ 36V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-WETQFN (3.5x3.5)
MAX25249BATPO/VY+T FAQ
1.How can I place an order for MAX25249BATPO/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25249BATPO/VY+T 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 MAX25249BATPO/VY+T reliable?
The price and inventory of MAX25249BATPO/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25249BATPO/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25249BATPO/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25249BATPO/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25249BATPO/VY+T?
MAX25249BATPO/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25249BATPO/VY+T 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 MAX25249BATPO/VY+T?
For technical support, including MAX25249BATPO/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25249BATPO/VY+T requirements.
6.How does Aetrix verify that MAX25249BATPO/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25249BATPO/VY+T 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 MAX25249BATPO/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25249BATPO/VY+T?
All MAX25249BATPO/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25249BATPO/VY+T, 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 MAX25249BATPO/VY+T part is unused and in its original packaging.
Return procedure for MAX25249BATPO/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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