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Analog Devices Inc./Maxim Integrated MAX20458ATIF/VY+T
- Part No.:
- MAX20458ATIF/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX20458ATIF/VY+T.pdf
- Description:
- 36V BOOST CONTROLLER WITH 4A SYN
- Quantity:
- Payment:
- Shipping:
Inventory:1,801
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Product details
Overview
MAX20458ATIF/VY+T from Analog Devices is an automotive-grade dual-output power management IC integrating a 3.5A synchronous buck converter (configurable for 3.3V or 5V fixed output) and a 36V asynchronous boost controller with 400kHz/2.1MHz switching options. It operates from 3.5V to 36V input, sustains regulation down to 2V battery during cold-crank, and delivers power-good signaling, cycle-by-cycle current limiting, and thermal shutdown. It targets mid-to-high-power automotive systems requiring robust start-stop and crank-ready operation.
For engineers reviewing the MAX20458ATIF/VY+T datasheet, MAX20458ATIF/VY+T pinout, MAX20458ATIF/VY+T application, or MAX20458ATIF/VY+T equivalent, key selection considerations include its dual-rail enable control (EN1/EN2), FSYNC-programmable operation modes (forced PWM, skip, PLL-sync), spread-spectrum EMI reduction, and thermally enhanced 5mm × 5mm TQFN-EP package with exposed pad for automotive under-hood thermal management.
Technical Context
The MAX20458ATIF/VY+T implements valley-current-mode control for its 3.5A buck converter and peak-current-mode control for its boost controller, enabling stable regulation across wide VIN transients. Its dual independent enable inputs (EN1, EN2) support flexible power sequencing between buck and boost rails, while the FSYNC pin provides three distinct operational modes: forced fixed-frequency PWM, ultra-low-quiescent skip mode, and phase-locked synchronization to an external clock.
It integrates a 5V internal BIAS LDO powered from SUPSW1 and supports EXTVCC switchover to bypass the LDO using an external 3.25V–5.5V supply-reducing internal dissipation and improving light-load efficiency. The boost controller features a 50mV current-limit threshold at CSP and supports cold-crank operation by maintaining regulation down to 2V battery input via preboost functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous; supports cold-crank operation down to 2V input via boost pre-regulation |
| Buck Output Current | 3.5A continuous; enables compact mid-power rail generation without external current-sense amplifiers |
| Switching Frequencies | Factory-set 400kHz or 2.1MHz; higher frequency allows smaller inductors/capacitors and avoids AM band interference |
| Quiescent Current | 10µA (buck only enabled), 30µA (both regulators active); meets OEM standby power budgets for always-on modules |
| Operating Temperature | -40°C to +125°C ambient; qualified for under-hood automotive applications per AEC-Q100 stress requirements |
| Thermal Resistance | θJA = 27°C/W (4-layer board); EP-connected ground pad enables efficient heat extraction in high-power density layouts |
| Protection Features | Cycle-by-cycle current limit, thermal shutdown at 170°C (20°C hysteresis), UVLO on BIAS (3.1V rise / 2.6V fall) |
Pinout & Package
MAX20458ATIF/VY+T is housed in a thermally enhanced 5mm × 5mm, 28-pin TQFN-EP package (package code T2855Y+5C) with exposed pad (EP) soldered to PCB ground for optimal thermal performance. Pin count and layout match the MAX20458 family's standardized footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 | Buck 1 Enable Input | Active-high HV-tolerant logic input; controls buck startup/sequencing independently of boost rail |
| EN2 | Boost Controller Enable Input | Active-high HV-tolerant logic input; enables preboost during cold-crank or start-stop events |
| FB1 | Buck Feedback Input | Regulated to 1.0V (typ); connects to BIAS for fixed 3.3V/5V output or to resistor divider for 1V–14V adjustment |
| PGOOD1 | Buck Power-Good Output | Open-drain signal asserting low when OUT1 falls below 93.5% of nominal; used for downstream supply enable or fault reporting |
| FSYNC | Frequency Synchronization Input | Accepts external clock (250kHz–2.6MHz); selects FPWM, skip, or PLL-sync mode based on logic level and pulse timing |
| LX1 | Buck Switch Node | Connects to buck inductor; requires low-inductance layout due to fast 20ns min on-time and high dI/dt switching |
| BST1 | Bootstrap Capacitor Terminal | Drives high-side MOSFET gate; requires ceramic capacitor (≥100nF) between BST1 and LX1 for reliable gate drive |
| COMP | Boost Error Amplifier Output | Connects to RC compensation network; sets loop stability for adjustable boost output configurations |
| EXTVCC | External Bias Supply Input | Accepts 3.25V–5.5V external rail to disable internal BIAS LDO-reducing thermal load and improving light-load efficiency |
| EP | Exposed Thermal Pad | Must be soldered to solid ground plane; primary thermal path for junction-to-board heat transfer (θJC = 3°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| 20ns minimum on-time (buck) | Enables stable 3.3V output at 2.1MHz without skip-mode artifacts-critical for AM-band-sensitive infotainment systems |
| Spread-spectrum modulation (±6%) | Reduces peak EMI emissions by spreading energy across 110μs (2.1MHz) or 577.5μs (400kHz) windows-no external components required |
| Programmable FSYNC modes | Three selectable operating modes: forced PWM (constant fSW), skip (ultra-low IQ), or PLL-sync (EMI-controlled system-level timing) |
| Cold-crank regulation support | Boost controller maintains buck input above dropout down to 2V battery-ensuring uninterrupted operation during engine cranking |
| Independent dual-enable architecture | EN1 and EN2 allow precise sequencing of buck and boost rails-enabling safe power-up/down in distributed DC architectures |
Applications
| Automotive Start-Stop System | Instrument Cluster |
|---|---|
|
Use Scenario: Power management during repeated engine stop/start cycles with battery voltage sagging to 2V–6V. IC Role / Device Role / Timing Role: Dual-rail PMIC providing regulated 5V for microcontroller and 10V for display backlight driver, with EN2-triggered preboost sustaining buck input during cranking. Use Value: Eliminates need for separate preboost IC; ensures uninterrupted cluster operation and fast wake-up from deep sleep (<30µA total IQ). |
Use Scenario: Compact, thermally constrained dashboard module powering MCU, CAN transceiver, and TFT display interface. IC Role / Device Role / Timing Role: Primary power source delivering 3.3V @ 3.5A to MCU core and 10V @ 1A to display LED driver, with PGOOD1 enabling downstream supplies only after stable rail establishment. Use Value: Single-chip solution reduces BOM count and PCB area vs. discrete buck+boost; TQFN-EP package meets under-dash thermal limits. |
| Navigation and Radio Head Unit | Distributed DC Power Systems |
|
Use Scenario: High-EMI environment where AM/FM radio reception must remain unaffected by switching noise. IC Role / Device Role / Timing Role: Main power IC supplying 5V to audio DSP and 3.3V to RF front-end, operating in 2.1MHz spread-spectrum mode synchronized to system clock via FSYNC. Use Value: ±6% frequency dithering lowers peak EMI by >10dB; 20ns min on-time prevents subharmonic oscillation at 3.3V output. |
Use Scenario: Zone-based vehicle architecture requiring localized, sequenced power domains with shared thermal budget. IC Role / Device Role / Timing Role: Local PMIC node generating isolated 5V/10V rails for zone controller and sensors, with EXTVCC connected to local 5V rail to minimize self-heating. Use Value: EXTVCC switchover cuts internal bias dissipation by >70%; dual EN pins enable deterministic inter-zone power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive dual-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20457ATIF/VY+T | Same pinout and package; lacks spread-spectrum option and has fixed 2.1MHz only (no 400kHz option) | Suitable for cost-sensitive designs where EMI compliance is met without spread-spectrum; not recommended for AM-band-critical head units | Select MAX20457ATIF/VY+T only if spread-spectrum and FSYNC programmability are unnecessary and 400kHz operation is not required. |
| MPQ4333-AEC1 | Single 3.5A buck only (no integrated boost); requires external boost controller for cold-crank support | Applicable where preboost is implemented separately or cold-crank is not required; lower integration but simpler layout | Choose MPQ4333-AEC1 when system already includes a dedicated boost stage or when thermal budget allows two discrete ICs. |
Compared with MAX20457ATIF/VY+T, the MAX20458ATIF/VY+T adds spread-spectrum and dual-frequency flexibility-critical for stringent EMI environments-while compared with MPQ4333-AEC1, it integrates cold-crank capability into one package, reducing component count and interconnect complexity in start-stop systems.
Availability
MAX20458ATIF/VY+T is available at Aetrix Electronics and suitable for automotive start-stop systems, instrument clusters, navigation head units, and distributed DC power systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX20458ATIF/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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and consumer markets with precision power, sensing, and signal chain solutions.
The MAX20458ATIF/VY+T belongs to Analog Devices' automotive-grade power management portfolio, designed specifically for demanding vehicle electrification applications including start-stop, ADAS domain controllers, and infotainment systems requiring AEC-Q100 qualification and robust cold-crank operation.
FAQ
What is the maximum input voltage the MAX20458ATIF/VY+T can withstand?
The MAX20458ATIF/VY+T supports continuous operation up to 36V input, with absolute maximum ratings allowing transient exposure to 40V on SUP, SUPSW1, FB2, EN1, and EN2 pins relative to AGND. This rating enables direct connection to 24V automotive systems and tolerance of load-dump transients when properly clamped externally.
Can the MAX20458ATIF/VY+T generate both 3.3V and 5V simultaneously?
Yes-the MAX20458ATIF/VY+T's buck converter supports either 3.3V or 5V fixed output (selected via FB1-to-BIAS connection), while its boost controller delivers a fixed 10V output. To generate both 3.3V and 5V rails, a second buck converter or LDO would be required downstream of the 5V buck output; the MAX20458ATIF/VY+T itself provides one adjustable/fixed buck output plus one boost output.
How does the FSYNC pin affect MAX20458ATIF/VY+T operation modes?
The FSYNC pin configures three distinct modes: logic-low enables skip mode (ultra-low quiescent current), logic-high enables forced PWM (constant 400kHz or 2.1MHz), and an external clock signal enables PLL-synchronized operation. The MAX20458ATIF/VY+T detects pulse width to distinguish between 2.1MHz (≥100ns) and 400kHz (≥1.5µs) sync signals, ensuring correct mode selection without configuration registers.
Is the MAX20458ATIF/VY+T qualified for automotive use?
Yes-the MAX20458ATIF/VY+T is AEC-Q100 qualified for Grade 1 (-40°C to +125°C ambient), features built-in protection including thermal shutdown at 170°C (20°C hysteresis), cycle-by-cycle current limiting, and undervoltage lockout on BIAS and SUP rails. Its 5mm × 5mm TQFN-EP package is optimized for automotive thermal and vibration reliability.
What is the purpose of the EXTVCC pin on the MAX20458ATIF/VY+T?
The EXTVCC pin allows bypassing the internal 5V BIAS LDO by applying an external 3.25V–5.5V supply-reducing internal power dissipation and improving light-load efficiency. When EXTVCC drops below ~3V, the IC automatically switches back to the internal LDO. This feature is especially valuable in thermally constrained automotive modules where minimizing self-heating is critical.
MAX20458ATIF/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller/Converter
- Voltage - Input:
- 3.5V ~ 36V
- Number of Outputs:
- 2
- Voltage - Output:
- 3.3V, 5V, 10V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-TQFN (5x5)
MAX20458ATIF/VY+T FAQ
1.How can I place an order for MAX20458ATIF/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20458ATIF/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 MAX20458ATIF/VY+T reliable?
The price and inventory of MAX20458ATIF/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 MAX20458ATIF/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20458ATIF/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20458ATIF/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20458ATIF/VY+T?
MAX20458ATIF/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20458ATIF/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 MAX20458ATIF/VY+T?
For technical support, including MAX20458ATIF/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20458ATIF/VY+T requirements.
6.How does Aetrix verify that MAX20458ATIF/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20458ATIF/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 MAX20458ATIF/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20458ATIF/VY+T?
All MAX20458ATIF/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20458ATIF/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 MAX20458ATIF/VY+T part is unused and in its original packaging.
Return procedure for MAX20458ATIF/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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