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Analog Devices Inc./Maxim Integrated MAX20028BATJA/VY+
- Part No.:
- MAX20028BATJA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX20028BATJA/VY+.pdf
- Description:
- 3 CHANNEL HV DC/DC CONVERTER FOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,651
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Product details
Overview
MAX20028BATJA/VY+ from Analog Devices is a 3-channel automotive-grade PMIC integrating one high-voltage synchronous step-down controller (OUT1) and two cascaded low-voltage synchronous step-down converters (OUT2/OUT3), operating at up to 2.1MHz. It delivers 3A per low-voltage channel, supports 3.5V–36V input, consumes only 30µA quiescent current, and is AEC-Q100 qualified for ADAS power rails.
For engineers reviewing the MAX20028BATJA/VY+ datasheet, MAX20028BATJA/VY+ pinout, MAX20028BATJA/VY+ application, or MAX20028BATJA/VY+ equivalent, key selection considerations include its side-wettable 32-pin TQFN-EP package, individual enable/reset per channel, spread-spectrum EMI reduction, SYNC I/O flexibility, and ±1% FB accuracy meeting ASIL-B timing-critical requirements.
Technical Context
The MAX20028BATJA/VY+ implements a current-mode PWM architecture with forced-PWM and skip modes, enabling stable regulation across wide load transients while minimizing light-load power loss. Its OUT1 controller features internal slope compensation, integrated transconductance error amplifier (gMEA = 300–1200µS), and programmable soft-start (4ms).
OUT2 and OUT3 operate synchronously at 2.1MHz with 180° phase shift, share PV2/PV3 inputs tied to OUT1, and use integrated FETs with RDS(ON) < 110mΩ (high-side) and < 90mΩ (low-side). All three channels feature independent enable inputs, open-drain RESET outputs with programmable timeout (0.1–7.8ms), and overtemperature warning (ERR at +150°C) plus shutdown (+170°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous; withstands 42V load-dump transients - enables direct battery connection in 12V/24V automotive systems. |
| Switching Frequency | 2.1MHz (CSEL1 = GND); factory-set options down to 350kHz - eliminates AM-band interference and reduces inductor size. |
| Quiescent Current | 30µA with OUT1 enabled - meets automotive "always-on" low-power requirements without compromising startup speed. |
| Output Accuracy | ±1% FB voltage accuracy; ±2% output voltage accuracy - satisfies ASIL-B functional safety monitoring thresholds. |
| Output Current Capability | OUT2/OUT3: up to 3A DC per channel (Option 1); OUT1: controller-only, supports external high-current FETs - enables scalable power delivery for camera modules and radar SoCs. |
| Thermal Protection | Thermal warning at +150°C (ERR assert); shutdown at +170°C with 30°C hysteresis - ensures safe operation under sustained high ambient conditions. |
| Package | 32-pin TQFN-EP (5mm × 5mm × 0.75mm), side-wettable - supports automated optical inspection (AOI) and improves solder joint reliability in automotive reflow profiles. |
Pinout & Package
MAX20028BATJA/VY+ uses a 32-pin, 5mm × 5mm, 0.75mm-thick side-wettable TQFN-EP package with exposed pad (EP = GND). Pin numbering follows top-view standard; EP must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSUP | Main HV supply input | Accepts 3.5V–36V battery rail; bypassed with ≥0.1µF ceramic capacitor - primary path for transient energy absorption. |
| EN1, EN2, EN3 | Independent digital enable inputs | Active-high, 1.6–2.0V threshold; each controls startup sequencing of respective buck channel - enables flexible power-up order for SoC subsystems. |
| OUT1, OUT2, OUT3 | Output voltage sense / negative current-sense nodes | Direct connection to converter outputs; used for feedback regulation and current sensing - eliminates need for external sense resistors on low-side path. |
| RESET1, RESET2, RESET3 | Open-drain reset status outputs | Assert low when corresponding output drops >6% below nominal; timeout programmable (0.1–7.8ms) - provides deterministic power-good signaling for microcontrollers. |
| SYNC | Configurable synchronization I/O | Factory-programmable as input (1.7–2.4MHz external clock sync) or output (2.1MHz internal clock) - reduces system-level EMI by aligning switching edges across multiple rails. |
| SSEN | Spread-spectrum enable | Logic-high (BIAS) activates ±6% frequency dithering at 4kHz rate - suppresses narrowband radiated emissions without altering loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output architecture with cascaded topology | OUT2/OUT3 powered from OUT1 - improves overall efficiency vs. independent buck converters and reduces component count in multi-rail ADAS ECUs. |
| Individual soft-start timing | 4ms for OUT1; 2.5ms for OUT2/OUT3 - prevents inrush current stacking during sequential power-up of vision processor, ISP, and memory rails. |
| High-accuracy voltage monitoring | ±0.5% OV/UV detection accuracy - enables precise fault detection for ISO 26262-compliant diagnostic routines without external comparators. |
| Integrated BIAS LDO with switchover | 5V internal regulator; automatically switches to OUT1 when VOUT1 > 4.2V - eliminates external bias supply and simplifies power tree for compact camera modules. |
| Robust protection suite | Overcurrent limiting (100–150mV CS1 threshold), overtemperature shutdown, undervoltage lockout (2.7V PV UVLO), and output discharge - ensures fail-safe behavior during fault conditions. |
Applications
| Automotive Camera Module Power | Radar SoC Core Supply |
|---|---|
Use Scenario: Powers image sensor, ISP, and MIPI interface in front/rear-view cameras requiring tight voltage tolerance and low EMI. IC Role / Device Role / Timing Role: Provides regulated 1.2V (OUT2) and 1.8V (OUT3) from 5V (OUT1), synchronized at 2.1MHz to avoid MIPI clock interference. Use Value: 180° phase shift between OUT2/OUT3 minimizes input capacitance ripple; ±1% accuracy ensures consistent sensor gain calibration across temperature. |
Use Scenario: Supplies core voltage (1.0V) and I/O voltage (1.8V) to 77GHz radar processors in ADAS domain controllers. IC Role / Device Role / Timing Role: Delivers 3A per rail with fast transient response; SYNC output locks all rails to common 2.1MHz clock for deterministic timing analysis. Use Value: 30µA quiescent current enables always-on radar wake-up functionality; AEC-Q100 qualification guarantees operation at +125°C junction temperature. |
| ADAS Domain Controller Auxiliary Rails | Automotive Infotainment Display Backlight |
Use Scenario: Generates 3.3V (OUT1), 1.1V (OUT2), and 1.8V (OUT3) for MCU, CAN transceiver, and Ethernet PHY in centralized ADAS ECUs. IC Role / Device Role / Timing Role: Uses individual ENx inputs to sequence power-up of safety-critical MCU before communication peripherals. Use Value: Independent RESETx outputs feed MCU watchdog timers; ±2% output accuracy meets ASIL-B diagnostic coverage requirements. |
Use Scenario: Supplies 5V (OUT1) to LED driver IC and 3.3V (OUT2) to display timing controller in digital instrument clusters. IC Role / Device Role / Timing Role: Leverages SSEN to activate spread-spectrum mode during display brightness transitions - suppresses conducted EMI into sensitive analog audio paths. Use Value: Side-wettable TQFN package ensures solder joint reliability during thermal cycling; -40°C to +125°C rating supports under-hood mounting near HVAC ducts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel automotive DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20029BATJA/VY+ | Same pinout and package; differs only in factory-trimmed OUT1 voltage (3.3V fixed vs. MAX20028's 5.0V fixed) | Used where lower main rail voltage required for legacy MCU cores; no change to OUT2/OUT3 configuration or sequencing logic | Select MAX20029BATJA/VY+ only if 3.3V OUT1 is mandatory; otherwise MAX20028BATJA/VY+ offers wider VIN range margin for cold-crank scenarios. |
| TPS653221AQPWPRQ1 | 3-channel PMIC with integrated LDOs; lower max switching frequency (2.2MHz); no spread-spectrum or SYNC output capability | Targeted at simpler body electronics; lacks individual RESET outputs and ±0.5% OV/UV accuracy needed for ASIL-B diagnostics | Choose TPS653221AQPWPRQ1 for cost-sensitive non-safety applications; MAX20028BATJA/VY+ remains preferred for ADAS due to diagnostic completeness and EMI control. |
Compared with MAX20028BATJA/VY+, the MAX20029BATJA/VY+ offers identical functionality except for fixed 3.3V OUT1, while the TPS653221AQPWPRQ1 trades diagnostic precision and EMI suppression for integration density - making MAX20028BATJA/VY+ optimal for ASIL-B-compliant ADAS power domains requiring deterministic fault reporting and radiated emissions compliance.
Availability
MAX20028BATJA/VY+ is available at Aetrix Electronics and suitable for automotive camera modules, radar SoC supplies, ADAS domain controllers, and infotainment display backlights requiring stable component supply across extended temperature and long production lifecycles.
Supply support for MAX20028BATJA/VY+ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA, with deep expertise in automotive power management and functional safety.
The MAX20028BATJA/VY+ belongs to Analog Devices' automotive PMIC portfolio, designed specifically for ASIL-B-compliant ADAS subsystems requiring high-efficiency, low-noise, and robust fault-handling capabilities in harsh environments.
FAQ
What is the maximum input voltage the MAX20028BATJA/VY+ can withstand during load-dump events?
The MAX20028BATJA/VY+ is protected against load-dump transients up to 42V on the VSUP pin, exceeding ISO 7637-2 Pulse 5a requirements. This allows direct connection to 12V/24V vehicle batteries without external TVS clamping in most automotive architectures. The device maintains regulation and does not latch up during such events, ensuring uninterrupted operation of downstream ADAS sensors.
Does the MAX20028BATJA/VY+ support external synchronization of all three channels simultaneously?
Yes - when configured as a SYNC input, the MAX20028BATJA/VY+ synchronizes OUT1, OUT2, and OUT3 to an external clock source within 1.7MHz–2.4MHz. When configured as a SYNC output, it drives all three channels with its internally generated 2.1MHz clock. This ensures deterministic phase alignment critical for EMI reduction in multi-rail ADAS systems.
How does the MAX20028BATJA/VY+ handle prebiased outputs during startup?
The MAX20028BATJA/VY+ variant (BATJ_) disables prebias output protection. If OUT1 is prebiased above 1.25V, the device will not initiate soft-start until the prebias is removed and OUT1 self-discharges to GND. This behavior prevents reverse current flow and ensures controlled ramp-up even when downstream capacitors retain charge from prior operation.
Can the MAX20028BATJA/VY+ operate with different output voltages on OUT2 and OUT3?
Yes - OUT2 and OUT3 support independent voltage programming via external resistor dividers connected to their respective OUT2/OUT3 pins. Each can be set from 0.8V to 3.95V, enabling asymmetric rail generation (e.g., 1.1V core + 1.8V I/O) without requiring additional regulators. Factory-trimmed versions also offer fixed 1.0V, 1.2V, 1.8V, and 3.3V options.
What thermal metrics define the MAX20028BATJA/VY+'s reliability in under-hood applications?
The MAX20028BATJA/VY+ has a junction-to-ambient thermal resistance (θJA) of 29°C/W and junction-to-case (θJC) of 1.7°C/W on a 4-layer JEDEC board. With thermal shutdown at +170°C and hysteresis of 15°C, it sustains continuous operation at +125°C ambient when properly heatsinked via the exposed pad. Its AEC-Q100 Grade 0 qualification confirms suitability for under-hood deployment.
MAX20028BATJA/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Controller/Converter
- Voltage - Input:
- 3.5V ~ 36V
- Number of Outputs:
- 3
- Voltage - Output:
- 0.8V ~ 3.95V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-WETQFN (5x5)
MAX20028BATJA/VY+ FAQ
1.How can I place an order for MAX20028BATJA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20028BATJA/VY+ 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 MAX20028BATJA/VY+ reliable?
The price and inventory of MAX20028BATJA/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20028BATJA/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20028BATJA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20028BATJA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20028BATJA/VY+?
MAX20028BATJA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20028BATJA/VY+ 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 MAX20028BATJA/VY+?
For technical support, including MAX20028BATJA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20028BATJA/VY+ requirements.
6.How does Aetrix verify that MAX20028BATJA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20028BATJA/VY+ 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 MAX20028BATJA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20028BATJA/VY+?
All MAX20028BATJA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20028BATJA/VY+, 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 MAX20028BATJA/VY+ part is unused and in its original packaging.
Return procedure for MAX20028BATJA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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