My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX20021ATIA+
- Part No.:
- MAX20021ATIA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX20021ATIA+.pdf
- Description:
- IC REG BUCK 1.25V QUAD 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,342
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX20021ATIA+ from Analog Devices is an automotive-grade quad synchronous step-down DC-DC PMIC integrating four 1A buck converters with factory-programmable 1.0V–4.0V outputs, 3.2MHz fixed-frequency PWM operation, and integrated high- and low-side MOSFETs (125mΩ pMOS / 100mΩ nMOS). It operates from 3.0V–5.5V input and delivers ±3% output accuracy over load, line, and temperature for point-of-load regulation in ADAS domain controllers.
For engineers reviewing the MAX20021ATIA+ datasheet, MAX20021ATIA+ pinout, MAX20021ATIA+ application, or MAX20021ATIA+ equivalent, this page provides verified technical context on its 28-pin TQFN-EP package, 180° phase interleaving between OUT3/OUT4, spread-spectrum EMI reduction, individual EN/PG signals, and thermal shutdown at +185°C - all critical for automotive power sequencing and layout-sensitive designs.
Technical Context
The MAX20021ATIA+ employs peak current-mode control with internal slope and loop compensation, eliminating external compensation components. Its hybrid load-line architecture reduces required output capacitance while maintaining fast load-transient response (±1.5% deviation under 1A step).
It features factory-trimmed input undervoltage monitoring (UVM threshold = 4.3V typ), input overvoltage protection (OVP = 5.8V typ), and cycle-by-cycle current limiting (1.65A typ) per channel. The SYNC input accepts external clocks (2.7–3.5MHz) to synchronize switching, and the SEL pin selects fixed 1.8V or 2.65V for OUT3 - a hardware-configured function not software-accessible.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 5.5V - supports direct connection to automotive battery rail after pre-regulation; UVLO triggers at 2.77V falling. |
| Switching Frequency | 3.2MHz (fixed) - enables use of 1.5µH inductors and all-ceramic 10µF output capacitors; minimizes EMI in AM band. |
| Output Current per Channel | Up to 1.0A - sustained delivery with 125mΩ high-side and 100mΩ low-side MOSFETs; thermal shutdown at +185°C protects during overload. |
| Output Voltage Range | 1.0V to 4.0V - factory-programmable or resistor-adjustable via OUTS_ feedback; FB set-point accuracy = 970–1030mV. |
| Phase Interleaving | OUT3 & OUT4 operate 180° out-of-phase - reduces input ripple current by cancellation, lowering required bulk input capacitance. |
| Power-Good Timing | PG_ asserts after 20,480 switching cycles post-regulation - ensures stable output before system release; blanking time prevents simultaneous soft-start of EN2–EN4. |
| EMI Reduction Features | Spread-spectrum option (±3% frequency dither at 1.5kHz) + forced-PWM mode - eliminates burst-mode noise and suppresses radiated emissions without compromising regulation. |
Pinout & Package
MAX20021ATIA+ is housed in a 28-pin, 5mm × 5mm × 0.8mm TQFN-EP package with exposed thermal pad (EP = GND), optimized for automotive thermal cycling and board-level reliability. Pin pitch is 0.5mm; land pattern follows JEDEC MO-220, outline number 21-0140.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1–EN4 | Active-high enable inputs | Independent digital control per buck channel; no internal pull-up - requires external logic or MCU GPIO drive. |
| PG1–PG4 | Open-drain power-good outputs | Assert low during soft-start, UV/OV fault, or shutdown; require 10kΩ pull-up to VA (≤VA) for clean logic interface. |
| LX1–LX4 | Switching node terminals | High-impedance when disabled; connect to 1.5µH inductor and ceramic output capacitor; layout must minimize loop area. |
| OUTS1–OUTS4 | Feedback voltage sense inputs | Connect directly to VOUT_ for fixed outputs; for adjustable versions, form resistive divider with R2 ≤ 100kΩ and VOUTS_ = 1000mV reference. |
| SEL | OUT3 voltage select | Hardwired to PGND_ (1.8V) or PV_ (2.65V); no toggling during operation - configuration is static at power-on. |
| SYNC | External clock synchronization input | Accepts 2.7–3.5MHz square wave; connect to PGND_ to use internal 3.2MHz oscillator - no pull-down required. |
| VA | Analog supply rail | Must be decoupled with ≥1µF ceramic cap to GND; tied to same source as PV_ inputs; powers internal reference and control logic. |
| PGND1–PGND4 & GND | Separate power and analog grounds | PGND pins are dedicated per buck stage to isolate high-current return paths; GND is analog reference - connect both to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Quad integrated buck converters | Four fully independent 1A channels with internal 125mΩ/100mΩ MOSFETs - eliminates need for 8 discrete FETs, gate drivers, and external compensation. |
| Automotive-grade thermal protection | Thermal shutdown at +185°C with 15°C hysteresis - ensures safe recovery after overtemperature events without latch-up or manual reset. |
| Factory-programmable UVM | Undervoltage monitor trips at 4.3V (typ) to signal brownout before UVLO (2.77V) disables outputs - enables early system warning and graceful shutdown. |
| 180° phase interleaving (OUT3/OUT4) | Reduces RMS input ripple current by ~30% versus in-phase operation - allows smaller 2.2µF ceramic input caps per PV_ rail instead of bulk electrolytics. |
| Fixed 3272-cycle soft-start | 3272 switching cycles at 3.2MHz = ~1.02ms ramp time - limits inrush current to <1.5× steady-state peak, preventing input rail collapse during power-up. |
| Synchronous PWM-only operation | No pulse-skipping or diode emulation - maintains constant 3.2MHz switching across full load range, ensuring predictable EMI spectrum and minimal output voltage ripple. |
Applications
| ADAS Domain Controller Power | Automotive Infotainment SoC Core Rails |
|---|---|
|
Use Scenario: Supplying multiple voltage domains (e.g., 1.2V CPU core, 1.8V GPU, 2.65V I/O, 3.3V peripheral) for NVIDIA Orin or Qualcomm SA8295P in centralized vehicle compute units. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated, sequenced, and monitored power to SoC subsystems with synchronized soft-start and independent PG signaling. Use Value: Eliminates need for four discrete buck ICs and associated passives; 3.2MHz operation enables compact 1.5µH inductors and 10µF X7R ceramics per rail - reducing total BOM area by >40% vs. 500kHz solutions. |
Use Scenario: Powering display processor, audio DSP, and connectivity modules (Wi-Fi 6E, Bluetooth LE) in head-unit systems requiring low-noise, fast transient response. IC Role / Device Role / Timing Role: Multi-rail PMIC providing independent enable/control and power-good status per subsystem to coordinate boot order and fault isolation. Use Value: Spread-spectrum + forced-PWM operation suppresses radiated emissions below CISPR-25 Class 5 limits; 180° phase interleaving cuts input ripple, easing filtering requirements on shared 5V supply rail. |
| Automotive Camera Module Power | Electric Power Steering (EPS) MCU Supply |
|
Use Scenario: Delivering clean, low-noise 1.8V and 2.8V rails to image sensor and ISP in surround-view or driver-monitoring cameras operating at -40°C to +125°C. IC Role / Device Role / Timing Role: High-efficiency buck converter with ±3% output accuracy and 15µs PG fault detection - ensures reliable sensor initialization and error reporting during cold cranking. Use Value: Integrated current sensing and thermal shutdown protect against shorted flex cables or connector faults; TQFN-EP package withstands mechanical shock and thermal cycling in camera housings. |
Use Scenario: Generating 3.3V and 5.0V auxiliary rails for EPS motor controller MCU, CAN transceivers, and position sensors in safety-critical steering systems. IC Role / Device Role / Timing Role: ASIL-B capable power manager with independent EN/PG per rail, OV/UV monitoring, and fail-safe shutdown - supports ISO 26262 functional safety requirements. Use Value: Input OVP (5.8V) and UVM (4.3V) provide dual-layer brownout detection; PG timeout and soft-start sequencing prevent MCU lockup during battery transients like load dump or jump start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-buck PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20022ATIA+ | 2.2MHz switching frequency (vs. 3.2MHz); identical pinout, package, and feature set except frequency and SEL behavior (MAX20022 SEL tied to PGND only). | Better suited for cost-sensitive industrial applications where lower frequency allows larger, cheaper inductors; less optimal for space-constrained automotive modules. | Select MAX20022ATIA+ only if 2.2MHz timing aligns with system clock tree or EMI testing shows advantage at lower fundamental frequency. |
| TPS659424RHBR | 6-channel PMIC with integrated LDOs, I²C programmability, and configurable sequencing; larger 40-pin VQFN package; higher quiescent current (12µA vs. 2.5mA). | Targets complex multi-rail SoCs requiring dynamic voltage scaling and firmware-controlled sequencing - not drop-in compatible due to different pin count, protocol, and footprint. | Choose TPS659424RHBR when system demands I²C register access, voltage margining, or >4 regulated rails; MAX20021ATIA+ remains preferred for simple, high-density, pin-strapped quad-buck needs. |
Compared with MAX20022ATIA+, the MAX20021ATIA+ offers higher switching frequency for smaller magnetics and tighter EMI control; compared with TPS659424RHBR, it trades configurability and channel count for minimal footprint, zero firmware dependency, and guaranteed automotive qualification (-40°C to +125°C).
Availability
MAX20021ATIA+ is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, infotainment SoC power delivery, and camera module point-of-load regulation requiring stable component supply, AEC-Q100 Grade 0 qualification, and long-term lifecycle support.
Supply support for MAX20021ATIA+ 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, and communications markets with precision power, sensing, and RF solutions.
The MAX20021ATIA+ belongs to Analog Devices' automotive power-management IC portfolio, designed specifically for demanding point-of-load regulation in ADAS, infotainment, and body electronics - emphasizing EMI robustness, thermal resilience, and functional safety readiness.
FAQ
What is the switching frequency of the MAX20021ATIA+ and is it adjustable?
The MAX20021ATIA+ operates at a fixed 3.2MHz switching frequency. This value is factory-set and not user-adjustable via pins or registers. The device does support synchronization to an external clock (2.7–3.5MHz) via the SYNC pin, but cannot be tuned to arbitrary frequencies. The 3.2MHz operation enables compact 1.5µH inductors and ceramic output capacitors while staying outside the AM radio band (0.53–1.71MHz), which is critical for automotive EMI compliance. MAX20021ATIA+ maintains this frequency across its full operating temperature range (-40°C to +125°C) with ±5% variation.
Does the MAX20021ATIA+ support adjustable output voltages, and how is it configured?
Yes, the MAX20021ATIA+ supports adjustable outputs via external resistive dividers connected to the OUTS1–OUTS4 pins. Each OUTS_ pin references an internal 1000mV (1.0V) feedback node; the output voltage is calculated as VOUT = 1.0V × (1 + R1/R2), where R2 ≤ 100kΩ. For fixed-output variants (like MAX20021ATIA+), the internal trim bits configure nominal voltages (e.g., 1.2V, 1.8V, 2.65V, 3.3V), and OUTS_ is connected directly to VOUT_. The SEL pin configures only OUT3 between 1.8V and 2.65V - MAX20021ATIA+ uses SEL tied to PV_ for 2.65V. No trimming resistors are needed for ±3% accuracy.
How does the MAX20021ATIA+ handle power sequencing and startup coordination across its four channels?
The MAX20021ATIA+ implements staggered soft-start to prevent simultaneous inrush: EN1 initiates first, followed by EN2–EN4 after fixed delays of 24,576 switching cycles (~7.7ms at 3.2MHz). Each channel has independent EN_ and PG_ signals, enabling MCU-driven sequencing. Soft-start duration is fixed at 3272 cycles (~1.02ms), and PG_ asserts high only after regulation is achieved and maintained for 20,480 cycles (~6.4ms). This deterministic timing eliminates need for external timers or FPGA logic - MAX20021ATIA+ delivers repeatable, reliable power-up behavior across temperature and voltage extremes.
What protection features does the MAX20021ATIA+ include for automotive reliability?
MAX20021ATIA+ integrates input overvoltage protection (OVP trips at 5.8V), input undervoltage monitoring (UVM warns at 4.3V), undervoltage lockout (UVLO disables at 2.77V), cycle-by-cycle current limiting (1.65A typ per channel), and thermal shutdown (+185°C with 15°C hysteresis). All protections are hardware-based with no firmware dependency. PG_ outputs deassert within 15µs of UV/OV fault detection, and current limiting operates without external sense resistors. These features meet ASIL-B readiness requirements for automotive power systems - MAX20021ATIA+ is AEC-Q100 qualified and specified for -40°C to +125°C ambient operation.
Can the MAX20021ATIA+ be used without the exposed thermal pad connected?
No - the exposed pad (EP) on the MAX20021ATIA+ must be soldered to a solid ground plane. It is electrically connected to GND and serves as the primary thermal path, contributing >80% of heat dissipation. Leaving EP unconnected violates JEDEC thermal specifications and risks junction temperature exceeding +150°C even at moderate loads (e.g., 4 × 0.5A). The datasheet mandates EP connection to GND via ≥4 thermal vias (0.3mm diameter) to an inner ground layer. MAX20021ATIA+ thermal performance (θJC = 3°C/W) is only guaranteed when EP is properly implemented - omitting it reduces power handling by >60% and may trigger premature thermal shutdown.
MAX20021ATIA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 4
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V, 1.8V, 2.65V, 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A, 500mA, 500mA, 1A
- Frequency - Switching:
- 3.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (5x5)
MAX20021ATIA+ FAQ
1.How can I place an order for MAX20021ATIA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20021ATIA+ 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 MAX20021ATIA+ reliable?
The price and inventory of MAX20021ATIA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20021ATIA+ is usually 5 days.
3.What payment methods are accepted for MAX20021ATIA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20021ATIA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20021ATIA+?
MAX20021ATIA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20021ATIA+ 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 MAX20021ATIA+?
For technical support, including MAX20021ATIA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20021ATIA+ requirements.
6.How does Aetrix verify that MAX20021ATIA+ is sourced from the original manufacturer or authorized distributors?
All MAX20021ATIA+ 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 MAX20021ATIA+ meets industry standards.
7.What is the process for return or replacement of MAX20021ATIA+?
All MAX20021ATIA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20021ATIA+, 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 MAX20021ATIA+ part is unused and in its original packaging.
Return procedure for MAX20021ATIA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX20021ATIA+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
