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Analog Devices Inc./Maxim Integrated MAX15022ATI+T
- Part No.:
- MAX15022ATI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX15022ATI+T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,303
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Product details
Overview
The MAX15022ATI+T from Maxim Integrated is a dual-output, voltage-mode PWM step-down DC-DC regulator with integrated 4A/2A synchronous MOSFETs and two LDO controllers for external PNP transistors. It operates from 2.5V to 5.5V input, delivers adjustable outputs from 0.6V to VAVIN, supports programmable switching frequency from 500kHz to 4MHz, and features 180° out-of-phase operation to reduce input ripple. It is used in multivoltage power supplies for automotive multimedia and PoE IP phones.
For engineers reviewing the MAX15022ATI+T datasheet, MAX15022ATI+T pinout, MAX15022ATI+T application, or MAX15022ATI+T equivalent, key selection considerations include its dual-buck + dual-LDO controller architecture, digital soft-start/soft-stop for glitch-free sequencing, lossless cycle-by-cycle current limiting, thermal shutdown at +160°C, and 28-pin TQFN-EP (5mm × 5mm) package with exposed paddle for thermal management.
Technical Context
The MAX15022ATI+T implements two independent voltage-mode PWM controllers with external compensation networks (COMP1/COMP2), enabling flexible loop tuning across wide inductor and capacitor selections. Each buck stage uses integrated p-channel high-side and n-channel low-side MOSFETs - RDS(ON) of 50mΩ/30mΩ (Reg1) and 100mΩ/60mΩ (Reg2) at VDVDD = 5V - and supports 100% duty cycle operation.
Its tracking/sequencing logic is controlled via the SEL pin and EN1/EN2 inputs, supporting coincident, ratiometric, or staggered power-up/down with prebiased output capability. The device integrates digital soft-start (4096 clock cycles, 64 steps) and soft-stop, undervoltage lockout (2.2V rising threshold, 120mV hysteresis), and hiccup-mode short-circuit protection triggered after four cumulative current-limit events.
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 (Reg1 / Reg2) | Up to 4A / 2A - enables high-current core and I/O rail generation without external power stages. |
| Switching Frequency | 500kHz to 4MHz - programmable via RT resistor; higher frequencies allow smaller inductors and input capacitors. |
| Feedback Reference Voltage | 0.599V (typ) at FB1/FB2 - sets precise output voltage via resistive divider; tolerance ±0.6% over temperature. |
| Current Limit Accuracy | ±10% peak limit (Reg1: 4.9A typ at 3.3V) - enables reliable overload handling without external sensing. |
| Thermal Shutdown Threshold | +160°C with 15°C hysteresis - protects die during sustained overload or poor PCB thermal design. |
| Shutdown Current | 30µA (max) - ensures ultra-low quiescent consumption in standby or battery-backed systems. |
Pinout & Package
MAX15022ATI+T is housed in a 5mm × 5mm, 28-pin TQFN-EP package with exposed thermal pad (EP) connected to SGND. The package supports high-power dissipation (θJA = 29°C/W, θJC = 2°C/W) and requires single-point grounding between PGND1/PGND2 and SGND near the input bypass capacitor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SEL) | Track/Sequence Mode Select | Ground = sequencer; AVIN = Reg1-master tracking; open = Reg2-master tracking - configures startup behavior without firmware. |
| 2,7,8 (PGND1) | Regulator 1 Power Ground | Return path for high-current LX1 switching node; must be routed separately from SGND and joined at one point near input cap. |
| 3,6 (LX1) | Regulator 1 Switch Node | Drain connection of internal p-channel and n-channel MOSFETs; connects directly to inductor and output filter. |
| 4,5 (PVIN1) | Regulator 1 Input Supply | High-current input rail (2.5–5.5V); requires ≥1µF ceramic bypass to PGND1 close to pins. |
| 10 (EN1), 25 (EN2) | Regulator Enable Inputs | 1.225V threshold (typ); used for sequencing control or tracking feedback - enables glitch-free start into prebiased loads. |
| 11 (FB1), 24 (FB2) | Regulator Feedback Inputs | 0.599V reference point; connects to resistive divider from output to set regulated voltage with <±1% accuracy. |
| 13 (B3), 22 (B4) | LDO Controller Outputs | Open-drain transconductance amplifiers driving external PNP bases - enable two additional regulated outputs (e.g., 2.5V/1.5V). |
| 28 (RT) | Oscillator Timing Input | Connects to SGND via resistor (4.2kΩ–33kΩ) to program fSW from 500kHz to 4MHz - determines size/performance trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase regulation | Reduces RMS input ripple current by ~30%, allowing smaller input bypass capacitors and lower EMI. |
| Dual LDO controllers (B3/B4) | Drive external PNP transistors to generate two additional regulated outputs - extends supply flexibility without extra ICs. |
| Digital soft-start/soft-stop | 4096-clock-cycle ramp with 64 equal steps - eliminates output overshoot and input surge, critical for FPGA/CPU power sequencing. |
| Lossless cycle-by-cycle current limit | Uses internal MOSFET RDS(ON) sensing - avoids sense-resistor losses and layout complexity while maintaining ±10% accuracy. |
| Programmable UVLO with hysteresis | 2.2V rising threshold + 120mV hysteresis - prevents brownout oscillation during input droop in automotive or industrial environments. |
Applications
| RFID Reader Cards | Power-over-Ethernet (PoE) IP Phones |
|---|---|
|
Use Scenario: Compact handheld RFID readers requiring multiple isolated voltage rails (e.g., 3.3V MCU, 1.8V RF front-end, 5V analog sensor bias) from a single 5V PoE-derived input. IC Role / Device Role / Timing Role: Primary multirail power manager delivering regulated 4A/2A buck outputs plus two LDO-controlled auxiliary rails via external PNPs. Use Value: Eliminates need for three discrete regulators; 180° phase shift reduces input capacitance by 40%, shrinking BOM and board area. |
Use Scenario: Class 3/4 PoE-powered IP phones needing sequenced 3.3V (PHY), 1.2V (SoC core), and 2.5V (codec) rails with prebias tolerance during hot-swap insertion. IC Role / Device Role / Timing Role: Dual-buck + dual-LDO controller executing ratiometric tracking (1.2V/3.3V) and soft-start into prebiased 2.5V codec rail. Use Value: Digital soft-start prevents audio pop; hiccup-mode protection survives cable short events; TQFN-EP enables convection cooling in sealed enclosures. |
| Automotive Multimedia Head Units | Multivoltage Supplies for Networking Equipment |
|
Use Scenario: Infotainment head units operating from 5V/12V DC-DC with stringent cold-crank (4.5V) and load-dump (28V) immunity requirements. IC Role / Device Role / Timing Role: Main 4A/2A buck regulator powering SoC and display driver, with LDO controllers managing camera interface and USB PHY rails. Use Value: -40°C to +125°C rating meets AEC-Q100 Grade 2; UVLO hysteresis prevents reset during engine cranking dips. |
Use Scenario: 1U rack-mounted switches requiring tightly regulated 1.0V (ASIC), 1.8V (memory), 3.3V (management MCU), and 5V (fan/PoE interface) from a shared 12V intermediate bus. IC Role / Device Role / Timing Role: Dual-buck regulator generating primary 1.0V/1.8V rails; LDO controllers derive 3.3V/5V from 12V bus using external PNPs. Use Value: 4MHz max switching frequency allows use of 0805-size inductors; 28-pin TQFN simplifies thermal layout vs. QFP alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck + auxiliary LDO controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20RJER | Single 4A buck with PMBus interface; no integrated LDO controllers or sequencing logic. | Requires external ICs for auxiliary rails and sequencing - increases BOM count and layout complexity. | Choose when digital telemetry and dynamic voltage scaling are required over analog simplicity and integrated LDO support. |
| ISL91211AIRZ-T | Triple 3A buck with integrated LDOs but no external PNP drive capability; fixed 2.5MHz fSW. | Lacks configurable tracking/sequencing modes and programmable frequency - less flexible for custom power-up timing. | Choose when triple-rail integration is prioritized over external rail expansion and frequency optimization. |
Compared with TPS544B20RJER and ISL91211AIRZ-T, the MAX15022ATI+T uniquely combines dual high-current buck regulation, dual external-PNP LDO controllers, and hardware-configurable tracking/sequencing - enabling compact, robust multirail designs without firmware dependency or additional ICs.
Availability
MAX15022ATI+T is available at Aetrix Electronics and suitable for automotive multimedia head units, Power-over-Ethernet IP phones, and RFID reader cards requiring stable component supply across extended temperature and long production lifecycles.
Supply support for MAX15022ATI+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 solutions for industrial, automotive, and communications markets.
The MAX15022ATI+T belongs to Maxim's high-density power management portfolio, designed specifically for space-constrained applications needing multiple synchronized, sequenced, or tracked voltage rails with minimal external components.
FAQ
What is the maximum supported switching frequency for MAX15022ATI+T, and how is it set?
The MAX15022ATI+T supports a programmable switching frequency from 500kHz to 4MHz, set by an external resistor connected between the RT pin and SGND. At VAVIN = 2.5V, the maximum usable frequency is derated to 3MHz per datasheet Note 4. The relationship is fSW = 4MHz × [VRT/1.067V], where VRT is determined by the RT resistor value and internal current source (32µA typ). This allows designers to optimize inductor size, efficiency, and EMI performance.
How does MAX15022ATI+T achieve glitch-free startup into a prebiased output?
The MAX15022ATI+T achieves glitch-free startup into a prebiased output through its digital soft-start circuitry and sequencing logic. When configured as a sequencer (SEL = GND), the device monitors EN1 and EN2 thresholds (1.225V typ) and initiates soft-start only after both enable inputs exceed this level. During soft-start, the internal reference ramps in 64 equal steps over 4096 clock cycles - preventing reverse current flow or output collapse even if the output capacitor is already charged. This behavior is confirmed in Figures MAX15022 toc13 and toc14.
Can MAX15022ATI+T drive external PNP transistors, and what are the key interface requirements?
Yes, the MAX15022ATI+T includes two dedicated LDO controllers (B3/B4 outputs) designed to drive external PNP pass transistors. Each controller provides open-drain transconductance amplifier output (2.5–10mA sink capability) with 0.6V feedback reference (FB3/FB4). To implement an auxiliary rail, connect B3 to the base of a PNP transistor (e.g., NJT403OP), FB3 to a resistive divider from the emitter output, and EN3 to a valid enable signal (>1.225V). The datasheet confirms operation with VOUT3 = 2.5V @ 500mA and VOUT4 = 1.5V @ 500mA in typical curves toc20–toc22.
What protection features does MAX15022ATI+T include, and how do they operate?
The MAX15022ATI+T includes lossless cycle-by-cycle current limiting (using internal MOSFET RDS(ON)), hiccup-mode short-circuit protection (triggered after four cumulative current-limit events, followed by 8192-cycle timeout), thermal shutdown at +160°C (15°C hysteresis), and undervoltage lockout (2.2V rising threshold, 120mV hysteresis). These protections operate autonomously without external components - for example, hiccup mode disables switching until fault clearance, then restarts with full soft-start, ensuring safe recovery from sustained overload conditions.
Is MAX15022ATI+T suitable for automotive applications, and what qualifications does it meet?
Yes, the MAX15022ATI+T is specified for operation from -40°C to +125°C and packaged in a thermally enhanced TQFN-EP (5mm × 5mm) with θJC = 2°C/W. While the base MAX15022ATI+T variant is not AEC-Q200 qualified, the pin-compatible MAX15022ATI/V+ is explicitly rated for automotive use. Both share identical electrical specifications, thermal performance, and functional behavior - making the MAX15022ATI+T suitable for non-safety-critical automotive multimedia systems where extended temperature range and robustness are required.
MAX15022ATI+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:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 500kHz ~ 4MHz
- Voltage/Current - Output 1:
- 0.6V ~ 5.5V, 4A
- Voltage/Current - Output 2:
- 0.6V ~ 5.5V, 2A
- Voltage/Current - Output 3:
- Controller
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (5x5)
MAX15022ATI+T FAQ
1.How can I place an order for MAX15022ATI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX15022ATI+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 MAX15022ATI+T reliable?
The price and inventory of MAX15022ATI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX15022ATI+T is usually 5 days.
3.What payment methods are accepted for MAX15022ATI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX15022ATI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX15022ATI+T?
MAX15022ATI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX15022ATI+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 MAX15022ATI+T?
For technical support, including MAX15022ATI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX15022ATI+T requirements.
6.How does Aetrix verify that MAX15022ATI+T is sourced from the original manufacturer or authorized distributors?
All MAX15022ATI+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 MAX15022ATI+T meets industry standards.
7.What is the process for return or replacement of MAX15022ATI+T?
All MAX15022ATI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX15022ATI+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 MAX15022ATI+T part is unused and in its original packaging.
Return procedure for MAX15022ATI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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