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Analog Devices Inc./Maxim Integrated MAX15021ATI+
- Part No.:
- MAX15021ATI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX15021ATI+.pdf
- Description:
- IC REG BUCK ADJ 2A/4A DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:196
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Product details
Overview
MAX15021ATI+ from Maxim Integrated is a dual-output, voltage-mode PWM step-down DC-DC regulator with integrated 4A/2A synchronous MOSFETs, programmable 500kHz–4MHz switching frequency, and configurable tracking or sequencing power-up/power-down control. It operates from 2.5V to 5.5V input, delivers adjustable outputs from 0.6V to VAVIN, and targets space-constrained multivoltage systems such as automotive multimedia and PoE IP phones.
For engineers reviewing the MAX15021ATI+ datasheet, MAX15021ATI+ pinout, MAX15021ATI+ application, or MAX15021ATI+ equivalent, key selection considerations include its 180° out-of-phase operation for reduced input ripple, digital soft-start/soft-stop into prebiased loads, lossless cycle-by-cycle current limiting, thermal shutdown at +160°C, and 28-pin 5mm × 5mm TQFN-EP package with exposed pad for thermal management.
Technical Context
The MAX15021ATI+ employs voltage-mode control with external compensation networks on COMP1/COMP2, enabling stable loop design across wide inductor/capacitor selections. Its dual regulators operate 180° out-of-phase, reducing RMS input ripple current and allowing smaller input bypass capacitors.
Tracking is implemented via resistive divider connections from master output to slave EN pin (coincident) or grounding EN (ratiometric); sequencing is selected by pulling SEL low, with independent 1.225V enable thresholds and glitch-free startup into prebiased outputs. Soft-start/soft-stop execute over 4096 clock cycles in 64 equal steps, with reference ramping to ensure monotonic voltage transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-supply operation from common intermediate rails like 3.3V or 5V. |
| Output Current Capability | Regulator 1: up to 4A; Regulator 2: up to 2A - enables high-current core logic and lower-current I/O rail generation from one IC. |
| Switching Frequency | 500kHz to 4MHz - selectable via RT resistor; higher frequencies allow smaller inductors and output caps but increase switching losses. |
| Feedback Reference Voltage | 0.599V (typ), ±6mV tolerance - sets output voltage accuracy; enables precise regulation down to 0.6V. |
| Current Limit Accuracy | Reg1 peak limit: 4.9A (typ) at 3.3V input; Reg2 peak limit: 2.45A (typ) - lossless high-side sensing ensures reliable overload protection without sense-resistor power loss. |
| Thermal Shutdown Threshold | +160°C with 15°C hysteresis - protects against sustained overloads or poor PCB thermal design while allowing brief high-power bursts. |
| Digital Soft-Start Duration | 4096 clock cycles - provides controlled, monotonic output ramp-up regardless of output capacitance or load, eliminating overshoot. |
Pinout & Package
MAX15021ATI+ is housed in a 28-pin, 5mm × 5mm TQFN-EP package with exposed thermal pad (EP) connected to SGND. The package supports -40°C to +125°C operation and requires single-point connection between PGND1/PGND2 and SGND near the input capacitor negative terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SEL | Selects tracking (open or AVIN) vs. sequencing (GND); determines master/slave relationship for coordinated power-up. |
| 2,7,8 | PGND1 | Power ground return for Regulator 1; must be routed separately from SGND and joined at single point near input cap. |
| 3,6 | LX1 | Switch node for Regulator 1; connects to inductor; carries high di/dt; requires tight layout to minimize EMI and voltage spikes. |
| 4,5 | PVIN1 | Input supply for Regulator 1; bypassed to PGND1 with ≥1µF ceramic capacitor close to pins. |
| 9 | DVDD1 | Driver supply for Regulator 1 high-side p-MOSFET; tied externally to PVIN1. |
| 10 | EN1 | Enable input for Regulator 1; threshold = 1.225V (typ); used for sequencing control or tracking feedback in master/slave configurations. |
| 11 | FB1 | Feedback input for Regulator 1; regulates to 0.599V; connects to resistor divider from VOUT1 to SGND. |
| 12 | COMP1 | Error amplifier output for Regulator 1; connects to external RC compensation network for loop stability. |
| 16 | DVDD2 | Driver supply for Regulator 2; tied externally to PVIN2. |
| 17 | PGND2 | Power ground return for Regulator 2; separate from PGND1, joined to SGND at single point. |
| 18 | LX2 | Switch node for Regulator 2; same layout constraints as LX1. |
| 19 | PVIN2 | Input supply for Regulator 2; bypassed to PGND2 with ≥1µF ceramic capacitor. |
| 23 | COMP2 | Error amplifier output for Regulator 2; independent compensation path for second loop. |
| 24 | FB2 | Feedback input for Regulator 2; identical 0.599V reference as FB1. |
| 25 | EN2 | Enable input for Regulator 2; symmetric function to EN1; critical for sequencing timing or tracking configuration. |
| 26 | SGND | Signal ground reference for analog circuitry (AVIN, FB, COMP, RT); connected to PGND_ at one point only. |
| 27 | AVIN | Analog supply input; powers internal references and bias circuits; bypassed to SGND with ≥100nF ceramic cap. |
| 28 | RT | Oscillator timing node; connects to resistor (4.2kΩ–33kΩ) to SGND to set switching frequency. |
| EP | Exposed Pad | Thermal interface to PCB copper; must be soldered to large SGND plane for effective heat dissipation; not primary SGND path. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase operation | Reduces RMS input ripple current by ~30%, enabling smaller input bypass capacitors and lower EMI filtering cost. |
| Digital soft-start/soft-stop | 4096-cycle ramp with 64-step resolution ensures monotonic, overshoot-free startup/shutdown even into prebiased loads. |
| Lossless cycle-by-cycle current limit | Eliminates external sense resistors, preserving efficiency and board space while providing accurate overcurrent protection. |
| Hiccup-mode short-circuit protection | Shuts down for 8192 cycles after four cumulative current-limit events, preventing thermal runaway during sustained faults. |
| External compensation (COMP1/COMP2) | Enables full loop optimization for diverse inductor DCR, ESR, and capacitor types - critical for high-transient applications. |
| Programmable UVLO with hysteresis | 2.2V rising threshold with 120mV hysteresis prevents oscillation near brownout conditions and reduces quiescent current during undervoltage. |
Applications
| RFID Reader Cards | Automotive Multimedia Systems |
|---|---|
Use Scenario: Compact handheld or embedded RFID readers requiring dual regulated rails (e.g., 3.3V for MCU and 1.8V for RF front-end). IC Role / Device Role / Timing Role: Dual buck regulator providing tightly coordinated power-up sequencing to prevent latch-up or bus contention during cold start. Use Value: Coincident tracking ensures both rails rise simultaneously with matched slew rates, eliminating reset glitches and enabling deterministic boot behavior. |
Use Scenario: Infotainment head units with multiple SoC cores, DDR memory, and display interfaces needing isolated, sequenced voltage domains. IC Role / Device Role / Timing Role: Primary power management IC delivering 4A core voltage and 2A I/O voltage with ratiometric tracking to maintain safe voltage margins. Use Value: Ratiometric tracking maintains fixed VOUT2/VOUT1 ratio during transients, ensuring compliance with processor I/O voltage tolerance specifications. |
| Power-over-Ethernet (PoE) IP Phones | Multivoltage Networking Equipment |
Use Scenario: Class 3/4 PoE-powered VoIP phones drawing up to 12.95W/25.5W, requiring efficient conversion from 48V-derived 5V/3.3V rails. IC Role / Device Role / Timing Role: Secondary-stage regulator converting intermediate 5V rail to 3.3V and 1.2V for Ethernet PHY and DSP subsystems. Use Value: 4MHz max switching frequency allows use of sub-1µH inductors, minimizing solution footprint in slim phone enclosures. |
Use Scenario: Small-form-factor switches/routers with FPGA, PHYs, and memory requiring independent, trackable 1.2V, 1.8V, and 3.3V supplies. IC Role / Device Role / Timing Role: Dual-output PMIC managing power sequencing across FPGA configuration, I/O banks, and transceivers. Use Value: Sequencing mode powers 1.2V core before 1.8V I/O, satisfying FPGA vendor requirements and preventing configuration corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20RJER | Single 4A output (not dual); supports 4.5V–18V input; uses D-CAP3 control; no built-in tracking/sequencing logic. | Requires external sequencing IC or GPIO coordination; better suited for higher-input industrial rails than MAX15021ATI+'s 2.5V–5.5V range. | Choose when input exceeds 5.5V or when only one high-current rail is needed with faster transient response. |
| ISL91211AIRZ-T7A | Dual 3A/3A outputs; supports 2.5V–5.5V input; includes I²C interface for dynamic voltage scaling; no native ratiometric tracking. | Enables firmware-controlled voltage adjustment but lacks hardware-based coincident/ratiometric tracking without host intervention. | Choose when system-level voltage agility (e.g., DVFS) is required over autonomous hardware tracking. |
Compared with TPS544B20RJER and ISL91211AIRZ-T7A, the MAX15021ATI+ uniquely integrates dual asymmetric outputs (4A/2A), hardware-selectable tracking/sequencing, and 180° phase shift in a single 5mm × 5mm package - simplifying BOM and layout for compact multirail designs operating below 5.5V.
Availability
MAX15021ATI+ is available at Aetrix Electronics and suitable for automotive multimedia systems, Power-over-Ethernet (PoE) IP phones, and RFID reader cards requiring stable component supply, extended temperature support (-40°C to +125°C), and RoHS-compliant packaging.
Supply support for MAX15021ATI+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for demanding industrial, automotive, and communications applications.
The MAX15021ATI+ belongs to Maxim's high-frequency dual buck regulator product line, designed specifically for space-constrained multivoltage systems requiring autonomous power sequencing, precise voltage tracking, and robust fault protection without external controllers.
FAQ
What is the maximum supported switching frequency for MAX15021ATI+ and how is it set?
The MAX15021ATI+ supports a programmable switching frequency from 500kHz to 4MHz, set by connecting an external resistor (4.2kΩ to 33kΩ) between the RT pin and SGND. At VAVIN ≤ 3V, the maximum usable frequency is derated to 3MHz per datasheet Note 4. This resistor-based configuration eliminates need for external clock sources while enabling optimization of inductor size, output capacitance, and efficiency trade-offs.
How does MAX15021ATI+ implement tracking versus sequencing modes?
The MAX15021ATI+ selects tracking or sequencing via the SEL pin: grounded for sequencing, connected to AVIN for output-1-as-master tracking, or left open for output-2-as-master tracking. In tracking mode, EN pins accept resistive dividers from master output to configure coincident (same ramp) or ratiometric (fixed ratio) behavior. In sequencing mode, each regulator starts only after its EN pin exceeds 1.225V, enabling ordered power-up with glitch-free entry into prebiased outputs.
What protection features are integrated into MAX15021ATI+?
The MAX15021ATI+ integrates lossless cycle-by-cycle current limiting (using internal MOSFET RDS(on) sensing), hiccup-mode short-circuit protection (triggered after four cumulative current-limit events), thermal shutdown at +160°C with 15°C hysteresis, and undervoltage lockout with 2.2V rising threshold and 120mV hysteresis. These features eliminate need for external protection components while ensuring robust operation under fault conditions.
Can MAX15021ATI+ operate with input voltages below 2.5V?
No - the absolute minimum input voltage for MAX15021ATI+ is 2.5V as specified in the Absolute Maximum Ratings and System Specifications tables. Operation below this violates the device's operational envelope and may result in failure to regulate, UVLO activation, or undefined behavior. The 2.5V lower limit applies to all supply pins: AVIN, PVIN1, PVIN2, and DVDD1/DVDD2.
What is the purpose of the exposed pad (EP) on the MAX15021ATI+ TQFN package?
The exposed pad (EP) on the MAX15021ATI+ serves as the primary thermal conduction path from the die to the PCB. It must be soldered to a large SGND copper plane to dissipate heat effectively; thermal resistance θJA is specified at 29°C/W using JEDEC JESD51-7 4-layer board conditions. EP is not intended as the main signal ground return - SGND and PGND connections remain electrically separate and join at a single point near the input capacitor.
MAX15021ATI+ 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:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A, 4A
- Frequency - Switching:
- 500kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (5x5)
MAX15021ATI+ FAQ
1.How can I place an order for MAX15021ATI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX15021ATI+ 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 MAX15021ATI+ reliable?
The price and inventory of MAX15021ATI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX15021ATI+ is usually 5 days.
3.What payment methods are accepted for MAX15021ATI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX15021ATI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX15021ATI+?
MAX15021ATI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX15021ATI+ 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 MAX15021ATI+?
For technical support, including MAX15021ATI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX15021ATI+ requirements.
6.How does Aetrix verify that MAX15021ATI+ is sourced from the original manufacturer or authorized distributors?
All MAX15021ATI+ 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 MAX15021ATI+ meets industry standards.
7.What is the process for return or replacement of MAX15021ATI+?
All MAX15021ATI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX15021ATI+, 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 MAX15021ATI+ part is unused and in its original packaging.
Return procedure for MAX15021ATI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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