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Analog Devices Inc./Maxim Integrated MAX15021ATI+T
- Part No.:
- MAX15021ATI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX15021ATI+T.pdf
- Description:
- IC REG BUCK ADJ 2A/4A DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,342
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Product details
Overview
MAX15021ATI+T from Maxim Integrated is a dual-output, voltage-mode PWM step-down DC-DC regulator delivering 4A on channel 1 and 2A on channel 2, operating from 2.5V to 5.5V input with adjustable outputs from 0.6V to VAVIN. It supports programmable switching frequency up to 4MHz, 180° out-of-phase operation, and digital soft-start/soft-stop for glitch-free power-up/down-used in multivoltage supplies for automotive multimedia and PoE IP phones.
For engineers reviewing the MAX15021ATI+T datasheet, MAX15021ATI+T pinout, MAX15021ATI+T application, or MAX15021ATI+T equivalent, key selection considerations include tracking/sequencing configuration (SEL pin), external RT resistor programming, dual-channel current limit thresholds (4.9A peak / 4.0A valley for Reg1; 2.45A peak / 2.5A valley for Reg2), thermal shutdown at +160°C, and 28-pin TQFN-EP package layout compatibility.
Technical Context
The MAX15021ATI+T implements two independent voltage-mode PWM controllers with external compensation networks (COMP1/COMP2), enabling precise loop tuning across wide inductor/capacitor selections. Each regulator integrates p-channel high-side and n-channel low-side MOSFETs-RDS(on) of 50mΩ/30mΩ (Reg1) and 100mΩ/60mΩ (Reg2) at 5V drive-supporting efficient synchronous buck conversion.
Tracking and sequencing are implemented via digital soft-start/soft-stop logic synchronized to enable inputs (EN1/EN2) and SEL pin state, with ratiometric or coincident behavior determined by resistive divider connections. The 180° phase shift between channels reduces RMS input ripple current, allowing smaller input bypass capacitors without compromising stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-supply operation from common system rails including 3.3V and 5V sources. |
| Output Current Capability | 4A (Reg1) / 2A (Reg2) - enables compact dual-rail power delivery for SoC/FPGA core and I/O domains. |
| Switching Frequency Range | 500kHz to 4MHz - set by RT resistor; higher frequencies allow smaller inductors (e.g., 0.47µH at 4MHz) and reduced output capacitance. |
| Feedback Reference Voltage | 0.599V (typ) - sets output voltage via external resistor dividers; enables precise regulation down to 0.6V. |
| Thermal Shutdown Threshold | +160°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Soft-Start Duration | 4096 clock cycles - ensures controlled ramp-up regardless of output capacitance or load, eliminating overshoot. |
| Shutdown Current | 20µA (max) - extends battery life in portable applications during standby mode. |
Pinout & Package
MAX15021ATI+T is housed in a 5mm × 5mm, 28-pin TQFN-EP package with exposed thermal pad (EP) connected to SGND for enhanced heat dissipation. Pin pitch is 0.5mm; recommended PCB layout uses single-point connection between PGND1/PGND2 and SGND near input capacitor negative terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SEL | Track/sequence mode select: grounded = sequencer; tied to AVIN = Reg1 master; open = Reg2 master. |
| 2,7,8 | PGND1 | Power ground return for Reg1 - must be routed separately from signal ground and joined to SGND at one point. |
| 3,6 | LX1 | Switch node for Reg1 - connects to inductor; requires low-inductance path to minimize EMI and voltage spikes. |
| 4,5 | PVIN1 | Input supply for Reg1 - bypassed with ≥1µF ceramic capacitor directly to PGND1. |
| 9 | DVDD1 | Driver supply for Reg1 - externally tied to PVIN1 to ensure proper gate drive voltage. |
| 10 | EN1 | Enable input for Reg1 - threshold 1.225V (typ); used for sequencing control or tracking feedback divider tap. |
| 11 | FB1 | Feedback input for Reg1 - regulates output to 0.599V reference; connects to resistor divider from VOUT1. |
| 12 | COMP1 | Error amplifier output for Reg1 - connects to external RC compensation network for loop stability. |
| 16 | DVDD2 | Driver supply for Reg2 - externally tied to PVIN2. |
| 17 | PGND2 | Power ground return for Reg2 - separate routing required; joined to SGND at single point. |
| 18 | LX2 | Switch node for Reg2 - connects to second inductor; 180° phase-shifted from LX1. |
| 19 | PVIN2 | Input supply for Reg2 - bypassed with ≥1µF ceramic capacitor directly to PGND2. |
| 23 | COMP2 | Error amplifier output for Reg2 - connects to dedicated RC compensation network. |
| 24 | FB2 | Feedback input for Reg2 - regulates output to same 0.599V reference as FB1. |
| 25 | EN2 | Enable input for Reg2 - threshold 1.225V (typ); used for sequencing or tracking feedback divider tap. |
| 26 | SGND | Signal ground reference - connects to system ground plane; joined to PGND1/PGND2 at single point. |
| 27 | AVIN | Analog input supply - powers internal circuitry; bypassed with ≥100nF ceramic capacitor to SGND. |
| 28 | RT | Oscillator timing input - connects to resistor (4.2kΩ–33kΩ) to SGND to set switching frequency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck regulators | Integrated 50mΩ/30mΩ (Reg1) and 100mΩ/60mΩ (Reg2) MOSFETs eliminate need for external switches and reduce BOM count. |
| 180° out-of-phase operation | Reduces RMS input ripple current by ~30%, enabling smaller input bypass capacitors (e.g., 10µF instead of 22µF). |
| Digital soft-start/soft-stop | 4096-cycle ramp with 64-step resolution ensures monotonic output rise/fall into prebiased loads without overshoot or undershoot. |
| Lossless cycle-by-cycle current limiting | High-side peak and low-side valley sensing provides accurate overcurrent protection without sense-resistor power loss. |
| Hiccup-mode short-circuit protection | Enters 8192-cycle timeout after four cumulative current-limit events, then auto-restarts with soft-start to prevent thermal runaway. |
Applications
| RFID Reader Cards | Automotive Multimedia Systems |
|---|---|
Use Scenario: Powering dual-rail FPGA or microcontroller with 1.2V core and 3.3V I/O in compact handheld RFID readers. IC Role / Device Role / Timing Role: Dual-output DC-DC regulator providing independent, tracked/sequenced voltages with glitch-free startup into prebiased rails. Use Value: Eliminates discrete regulators and sequencing ICs, reducing board area by >40% while ensuring reliable power-up under varying battery conditions (2.5V–5.5V). |
Use Scenario: Supplying infotainment head unit with 1.1V processor core, 1.8V memory, and 5V USB interface from 12V automotive rail via intermediate 5V bus. IC Role / Device Role / Timing Role: Primary dual-buck controller managing power sequencing between subsystems with thermal robustness to cabin temperature extremes. Use Value: 180° phase shift minimizes input capacitor stress in space-constrained dash designs; -40°C to +125°C rating ensures operation across full automotive temperature range. |
| Power-over-Ethernet (PoE) IP Phones | Multivoltage Supplies for Networking Equipment |
Use Scenario: Deriving 3.3V PoE interface and 1.2V DSP core from 48V PoE input using intermediate 5V DC-DC stage. IC Role / Device Role / Timing Role: Secondary-stage dual regulator delivering tightly regulated, sequenced outputs with low quiescent current during standby. Use Value: 20µA shutdown current extends battery backup runtime; digital soft-stop prevents data corruption during brownout recovery. |
Use Scenario: Generating multiple isolated rails (e.g., 1.8V, 2.5V, 3.3V) for switch ASICs, PHYs, and management controllers in 1U rack-mounted switches. IC Role / Device Role / Timing Role: Compact dual-buck solution supporting flexible tracking configurations to match varying SoC power-up requirements. Use Value: External RT resistor allows frequency optimization to avoid noise coupling into sensitive SerDes lanes; 4MHz capability enables <1mm height inductors. |
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-chip dual 4A/2A buck with integrated inductors; fixed 500kHz–2MHz frequency; no external RT or tracking/sequencing logic. | Targeted at space-constrained designs where board area is more critical than flexibility; lacks digital soft-start/soft-stop and SEL-configurable tracking. | Select when rapid prototyping with minimal external components is prioritized over fine-grained power sequencing control. |
| ISL85412IRZ-T7A | 4A/2A dual buck with 3.5V–36V input; supports only coincident tracking via analog method; no hiccup-mode protection or prebiased startup. | Suitable for industrial 24V systems requiring wide VIN; not rated for automotive temperature range or PoE input derating. | Choose for high-input-voltage applications where MAX15021ATI+T's 5.5V max input is insufficient, accepting trade-offs in sequencing sophistication and thermal margin. |
Compared with TPS544B20RJER and ISL85412IRZ-T7A, the MAX15021ATI+T uniquely combines 4MHz programmability, digital soft-start/soft-stop, SEL-configurable tracking/sequencing, and automotive-grade thermal protection in a single 5mm × 5mm package-making it optimal for compact, multi-rail embedded systems demanding precise power control.
Availability
MAX15021ATI+T 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 across extended temperature ranges and long production lifecycles.
Supply support for MAX15021ATI+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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX15021ATI+T belongs to Maxim's high-frequency dual buck regulator product line, designed specifically for space-constrained, multivoltage embedded systems requiring precise power sequencing, thermal resilience, and low-noise operation.
FAQ
What is the maximum supported switching frequency for MAX15021ATI+T, and how is it configured?
The MAX15021ATI+T supports a maximum switching frequency of 4MHz, set by connecting an external resistor (RT) between pin 28 and SGND. With RT = 4.2kΩ, fSW reaches 4MHz; increasing RT lowers frequency linearly down to 500kHz at 33kΩ. At VAVIN ≤ 3V, maximum frequency must be derated to 3MHz per datasheet Note 4 to maintain stability and duty-cycle control.
How does the MAX15021ATI+T implement tracking or sequencing between its two outputs?
The MAX15021ATI+T uses the SEL pin (pin 1) and enable inputs (EN1/EN2) to configure tracking or sequencing. Grounding SEL enables sequencing; tying SEL to AVIN configures Reg1 as master for coincident/ratiometric tracking; leaving SEL unconnected makes Reg2 the master. Tracking is achieved by connecting EN_ to a resistive divider from the master output, while sequencing requires EN_ to exceed 1.225V before regulation begins.
What protection features does the MAX15021ATI+T include, and how do they operate?
The MAX15021ATI+T includes lossless cycle-by-cycle current limiting (using high-side peak and low-side valley sensing), hiccup-mode short-circuit protection (triggered after four cumulative current-limit events, followed by 8192-cycle timeout), thermal shutdown at +160°C with 15°C hysteresis, and undervoltage lockout with 2.2V rising threshold and 120mV hysteresis. These features collectively prevent damage during overload, fault, or abnormal supply conditions.
Can the MAX15021ATI+T start up into a prebiased output, and under what conditions?
Yes, the MAX15021ATI+T supports glitch-free startup into a prebiased output-but only in sequencing mode (SEL = GND). In this configuration, soft-stop is disabled and complementary switching is inhibited until the first PWM pulse occurs, preventing reverse current flow from the output into the regulator. This ensures safe power-up when secondary rails are already energized by other sources.
What is the purpose of the COMP1 and COMP2 pins on the MAX15021ATI+T, and how are they used?
COMP1 and COMP2 are error amplifier outputs for Reg1 and Reg2 respectively, providing access to the internal voltage-mode control loop for external compensation. Each connects to a standard Type II or Type III RC network (e.g., series R-C from COMP to FB, parallel C from COMP to SGND) to stabilize the feedback loop across varying loads, input voltages, and output capacitors-enabling optimal transient response and phase margin.
MAX15021ATI+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
- 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+T FAQ
1.How can I place an order for MAX15021ATI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX15021ATI+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 MAX15021ATI+T reliable?
The price and inventory of MAX15021ATI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX15021ATI+T is usually 5 days.
3.What payment methods are accepted for MAX15021ATI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX15021ATI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX15021ATI+T?
MAX15021ATI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX15021ATI+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 MAX15021ATI+T?
For technical support, including MAX15021ATI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX15021ATI+T requirements.
6.How does Aetrix verify that MAX15021ATI+T is sourced from the original manufacturer or authorized distributors?
All MAX15021ATI+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 MAX15021ATI+T meets industry standards.
7.What is the process for return or replacement of MAX15021ATI+T?
All MAX15021ATI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX15021ATI+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 MAX15021ATI+T part is unused and in its original packaging.
Return procedure for MAX15021ATI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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