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Analog Devices Inc./Maxim Integrated MAX16993ATJA+
- Part No.:
- MAX16993ATJA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX16993ATJA+.pdf
- Description:
- IC REG BUCK ADJ 3A TRPL 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,291
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Product details
Overview
The MAX16993ATJA+ from Maxim Integrated is a 3-channel automotive-grade PMIC integrating one high-voltage synchronous step-down controller (OUT1) and two low-voltage synchronous step-down converters (OUT2/OUT3), all operating at up to 2.1MHz. It accepts 3.5V–36V input, delivers up to 3A per low-voltage channel, consumes only 30µA quiescent current, and is AEC-Q100 qualified for under-hood infotainment power rails.
For engineers reviewing the MAX16993ATJA+ datasheet, MAX16993ATJA+ pinout, MAX16993ATJA+ application, or MAX16993ATJA+ equivalent, key selection criteria include its 36V input tolerance, cascaded OUT2/OUT3 architecture, individual RESET_ outputs with programmable timeout, spread-spectrum enable (SSEN), and SYNC input for system-level clock synchronization in ADAS and body control modules.
Technical Context
The MAX16993ATJA+ implements a current-mode control architecture with forced-PWM and skip modes, enabling stable regulation across wide load ranges while minimizing EMI. Its OUT1 controller supports factory-trimmed or resistor-adjustable output voltages (3.0V–5.5V), while OUT2 and OUT3 operate from OUT1's output and support 0.8V–3.95V adjustable outputs with ±3% accuracy over temperature and load.
Pin-selectable switching frequency (2.1MHz or OTP-programmable lower options: 1.05MHz/525kHz/420kHz/350kHz) allows optimization for size vs. efficiency. The device integrates high- and low-side gate drivers (RDS(ON) < 4Ω), internal BIAS LDO (5V), and thermal shutdown at +170°C with 15°C hysteresis - all in a single 32-pin TQFN-EP package rated for −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous; withstands 42V load-dump transients - enables direct connection to automotive battery without external protection. |
| Switching Frequency | 2.1MHz (CSEL1 = GND); factory-set alternatives: 1.05MHz/525kHz/420kHz/350kHz - supports compact magnetics and avoids AM band interference. |
| Quiescent Current | 30µA with OUT1 enabled - meets automotive "always-on" low-power requirements for telematics and gateway ECUs. |
| Output Current Capability | OUT2/OUT3: up to 3.0A each (IMAX = 3.0A option); OUT1 drives cascaded topology - eliminates need for separate intermediate regulators. |
| Output Voltage Accuracy | ±2.5% for OUT1 (PWM mode); ±3.0% for OUT2/OUT3 - ensures reliable microcontroller and sensor rail regulation without precision resistors. |
| Operating Temperature | −40°C to +125°C ambient - qualified for engine bay and passenger compartment placement per AEC-Q100 Grade 0. |
| Protection Features | Overtemperature shutdown (+170°C), overcurrent limiting (100–150mV CS threshold), individual RESET_ outputs with 0.1ms–7.8ms programmable timeout - enables robust fault recovery in safety-critical systems. |
Pinout & Package
MAX16993ATJA+ uses a 32-pin TQFN-EP (5mm × 5mm × 0.75mm) with side-wettable QFND-EP variant, featuring exposed pad (EP = GND) for thermal dissipation (θJA = 29°C/W). Package supports automated optical inspection (AOI) and reflow-compatible soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSUP | Main HV input supply | Accepts 3.5V–36V battery input; includes UVLO startup at 4.5V and 42V transient tolerance. |
| EN1, EN2, EN3 | Independent enable inputs | Active-high digital controls; EN1 enables entire PMIC; EN2/EN3 independently activate OUT2/OUT3 after OUT1 soft-start completes. |
| OUT1, OUT2, OUT3 | Output voltage sense inputs | Connect directly to respective output nodes; enable feedback regulation and overvoltage detection (e.g., OUT1 monitors OUT1 rail). |
| RESET1, RESET2, RESET3 | Open-drain reset outputs | Assert low when corresponding output drops >6% below nominal; timeout programmable (0.1–7.8ms) - provides sequenced power-good signaling to MCU. |
| SSEN | Spread-spectrum enable | Logic-high (BIAS) activates ±6% frequency dithering at 4kHz - reduces peak EMI by >10dB without changing layout. |
| SYNC | Frequency synchronization I/O | Configurable as input: logic-high enables forced-PWM; external clock (1.7–2.4MHz) synchronizes all channels - eliminates beat frequencies in multi-rail systems. |
| CSEL1 | Buck 1 clock select | GND = 2.1MHz; BIAS = factory-divided frequency (×2/×4/×5/×6) - allows flexible trade-off between efficiency and EMI filtering component size. |
Key Features
| Feature | Design Value |
|---|---|
| Cascaded dual-buck architecture | OUT2/OUT3 powered from OUT1 output - improves overall system efficiency by ~5% vs. independent buck supplies and reduces component count. |
| Individual soft-start timers | 4ms for OUT1; 2.5ms for OUT2/OUT3 - prevents inrush current overload during cold cranking and enables controlled power sequencing. |
| Integrated BIAS LDO | 5V regulator (100mA max) powers internal circuitry and PV1 gate drive - eliminates need for external bias supply and simplifies PCB routing. |
| 180° out-of-phase operation | OUT2 and OUT3 switch 180° apart - reduces input capacitor RMS current by ~30%, lowering ripple and extending capacitor life. |
| AEC-Q100 qualification | Grade 0 (−40°C to +125°C) with thermal warning (+150°C) and shutdown (+170°C) - meets automotive functional safety requirements for ASIL-B systems. |
Applications
| Infotainment Head Unit Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codec in automotive head units requiring multiple isolated rails (e.g., 5V, 3.3V, 1.8V) from 12V battery. IC Role / Device Role / Timing Role: Primary PMIC delivering regulated outputs with precise sequencing and fault reporting via RESET_ signals. Use Value: Eliminates three discrete DC-DC ICs and associated compensation networks - reduces BOM cost by ~$1.20 and board area by 45%. | Use Scenario: Supplies image sensor, ISP, and serializer in rear-view or surround-view camera modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-reliability triple-output regulator with thermal monitoring and load-dump immunity. Use Value: Withstands 42V transients and operates continuously at +125°C ambient - avoids thermal derating and enables single-layer heatsink design. |
| Body Control Module (BCM) | Automotive Gateway ECU |
Use Scenario: Provides power to microcontroller, CAN transceivers, and LIN interfaces in door modules and lighting controllers. IC Role / Device Role / Timing Role: Low-quiescent-current PMIC supporting always-on wake-up functionality with 30µA standby draw. Use Value: Meets ISO 16750-2 Class D (cold crank) and Class E (battery disconnect) requirements - extends battery life during vehicle sleep mode. | Use Scenario: Delivers core logic (1.2V), I/O (3.3V), and CAN FD PHY (5V) rails in central gateway ECUs managing multiple vehicle domains. IC Role / Device Role / Timing Role: Synchronized multi-rail regulator with SYNC input enabling deterministic timing across domain processors. Use Value: 2.1MHz operation and 180° phase shift minimize conducted noise on shared 12V bus - reduces need for additional EMI filters by 2 stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel automotive PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20090ATPA+ | Single 3.5V–36V buck controller (no integrated low-voltage converters); requires external OUT2/OUT3 ICs. | Lacks cascaded dual-buck integration - suitable only when OUT2/OUT3 require different specs (e.g., higher current or different VOUT). | Select MAX20090ATPA+ if modular design, independent control, or higher OUT2/OUT3 current (>3A) is required. |
| TPS65321A-Q1 | Three independent buck regulators (no cascading); fixed 2.2MHz frequency; no spread-spectrum or SYNC input. | Higher quiescent current (45µA) and no programmable RESET timeout - less optimal for ultra-low-power always-on nodes. | Select TPS65321A-Q1 if strict 2.2MHz EMI profile is mandated and cascading efficiency gain is not critical. |
Compared with MAX20090ATPA+ and TPS65321A-Q1, the MAX16993ATJA+ uniquely combines high-voltage controller + dual cascaded bucks in one package, offering superior integration, lower total solution size, and advanced EMI mitigation features - making it optimal for space-constrained, thermally demanding automotive modules where power density and noise control are primary constraints.
Availability
MAX16993ATJA+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control units requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for MAX16993ATJA+ 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
Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets, with emphasis on reliability and integration.
The MAX16993ATJA+ belongs to Maxim's automotive PMIC product line, engineered specifically for compact, high-efficiency power delivery in harsh-temperature environments - targeting next-generation ADAS, infotainment, and domain controller applications.
FAQ
What is the maximum input voltage the MAX16993ATJA+ can withstand during automotive load-dump events?
The MAX16993ATJA+ is protected against load-dump transients up to 42V, exceeding ISO 7637-2 Pulse 5a requirements. This rating applies under normal operation with loads up to the maximum rated output current and transient durations ≤50ns. The device maintains regulation and does not latch off during such events, ensuring uninterrupted operation in 12V and 24V automotive systems.
Does the MAX16993ATJA+ support independent enable and reset control for each output channel?
Yes, the MAX16993ATJA+ provides dedicated EN2/EN3 inputs and open-drain RESET2/RESET3 outputs for OUT2 and OUT3, plus EN1 and RESET1 for OUT1. Each RESET_ asserts low when its output drops >6% below nominal and remains low for a programmable timeout (0.1ms–7.8ms). This enables precise power sequencing and fault isolation in multi-rail systems using the MAX16993ATJA+.
Can the MAX16993ATJA+ operate with an external clock source, and what are the acceptable frequency and duty-cycle ranges?
Yes, the MAX16993ATJA+ supports external clock synchronization via the SYNC pin. When configured as an input, it accepts frequencies from 1.7MHz to 2.4MHz with a 50% ±5% duty cycle. The internal oscillator locks to the external signal, aligning all three buck channels' switching edges - reducing beat frequencies and improving EMI predictability in systems with multiple synchronized MAX16993ATJA+ devices.
What is the purpose of the SSEN pin on the MAX16993ATJA+, and how does it affect EMI performance?
The SSEN (Spread-Spectrum Enable) pin on the MAX16993ATJA+ activates ±6% frequency dithering at a 4kHz modulation rate when pulled high to BIAS. This spreads spectral energy across a wider bandwidth, reducing peak radiated emissions by up to 12dB in the 30–1000MHz range. It is a hardware-controlled, zero-latency EMI mitigation feature that requires no firmware intervention and is fully compatible with SYNC-synchronized operation.
How does the cascaded architecture of OUT2 and OUT3 improve system efficiency compared to independent buck converters?
The MAX16993ATJA+ cascades OUT2 and OUT3 from OUT1's output, eliminating the need for separate HV-to-LV conversion stages. This reduces conduction losses by avoiding duplicate HV FET switching and leverages OUT1's high-efficiency regulation. Measured data shows ~5% higher full-load efficiency versus three independent buck converters, while also cutting input capacitance requirements by 30% due to interleaved operation - directly improving reliability and reducing solution size in the MAX16993ATJA+ design.
MAX16993ATJA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 3.95V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFN (5x5)
MAX16993ATJA+ FAQ
1.How can I place an order for MAX16993ATJA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16993ATJA+ 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 MAX16993ATJA+ reliable?
The price and inventory of MAX16993ATJA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16993ATJA+ is usually 5 days.
3.What payment methods are accepted for MAX16993ATJA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16993ATJA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16993ATJA+?
MAX16993ATJA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16993ATJA+ 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 MAX16993ATJA+?
For technical support, including MAX16993ATJA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16993ATJA+ requirements.
6.How does Aetrix verify that MAX16993ATJA+ is sourced from the original manufacturer or authorized distributors?
All MAX16993ATJA+ 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 MAX16993ATJA+ meets industry standards.
7.What is the process for return or replacement of MAX16993ATJA+?
All MAX16993ATJA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16993ATJA+, 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 MAX16993ATJA+ part is unused and in its original packaging.
Return procedure for MAX16993ATJA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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