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Analog Devices Inc./Maxim Integrated MAX5073ATI+
- Part No.:
- MAX5073ATI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX5073ATI+.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:242
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Product details
Overview
MAX5073ATI+ from Maxim Integrated is a dual-output, programmable buck/boost DC-DC converter with integrated high-side n-channel power MOSFETs. It operates from 5.5V to 23V input, delivers up to 2A (converter 1) and 1A (converter 2) in buck mode, supports 0.8V–28V output voltage range with ±1% accuracy, and features 180° out-of-phase switching at 200kHz–2.2MHz for telecom line card power regulation.
For engineers reviewing the MAX5073ATI+ datasheet, MAX5073ATI+ pinout, MAX5073ATI+ application, or MAX5073ATI+ equivalent, key selection criteria include thermal performance at +125°C ambient, dual independent enable/shutdown control, internal soft-start timing (2048 oscillator cycles), and master-slave four-phase clock synchronization via CLKOUT/SYNC.
Technical Context
The MAX5073ATI+ implements two independent voltage-mode PWM controllers with internal transconductance error amplifiers (gM = 1.2–2.9 mS), each generating 180° out-of-phase switching waveforms. Its internal oscillator is programmable via ROSC (400kHz–4.4MHz), with each converter operating at fSW = fOSC/2 (200kHz–2.2MHz).
Converter 1 integrates a 195–330 mΩ high-side MOSFET (RON1) rated for 5A peak current (1ms), while converter 2 uses a 330–690 mΩ MOSFET (RON2) rated for 3A peak. Both support buck (0.8V min) and boost (28V max) topologies, with individual PGOOD open-drain outputs and ±1% output voltage accuracy over –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 23V - supports wide industrial and telecom supply rails without external pre-regulation |
| Output Voltage Range | 0.8V (buck) to 28V (boost) - enables single IC to replace multiple fixed-output regulators |
| Max Output Current | 2A (conv1), 1A (conv2) in buck mode - sufficient for PoL loads on networking line cards |
| Switching Frequency | 200kHz to 2.2MHz - adjustable to avoid EMI bands and minimize passive size |
| Thermal Rating | –40°C to +125°C ambient - qualified for automotive under-hood and industrial edge applications |
| Output Accuracy | ±1% - ensures stable logic supply margins across temperature and load |
| Soft-Start Duration | 2048 fOSC cycles - prevents inrush current and ensures monotonic VOUT rise |
Pinout & Package
MAX5073ATI+ is housed in a thermally enhanced 28-pin thin QFN package (5mm × 5mm) with exposed pad (EP), rated for 2.7W dissipation at +70°C ambient and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLKOUT | Clock output | 45° phase-shifted signal enabling four-phase operation with second MAX5073 in master-slave configuration |
| 2 BST2/VDD2 | Bootstrap/bypass supply | Provides gate drive for converter 2 MOSFET; requires external capacitor to PGND (boost) or flying cap + diode (buck) |
| 3,4 DRAIN2 | MOSFET drain connection | High-side switch node in buck mode; low-side switch node in boost mode - defines topology-dependent PCB routing |
| 5 EN2 | Active-high enable | Independent shutdown control for converter 2; TTL-compatible; used for power sequencing with PGOOD1 |
| 6 FB2 | Voltage feedback input | Connects to resistive divider to set output voltage; supports sub-0.8V regulation using BYPASS reference |
| 7 COMP2 | Loop compensation | External RC network stabilizes converter 2 control loop; critical for transient response and phase margin |
| 8 SYNC | External clock input | Synchronizes both converters to system clock (400kHz–4.4kHz); fSYNC = 2×fSW |
| 10 OSC | Oscillator frequency set | ROSC resistor (5.6kΩ–56kΩ) programs internal oscillator; sets fSW = fOSC/2 |
| 11 V+ | Main input supply | Primary power rail (5.5V–23V); bypassed with ≥0.1µF ceramic capacitor near pin |
| 12,13 VL | Internal 5.2V LDO output | Powers internal circuitry; supplies BST1/VDD1 and BST2/VDD2; requires 4.7µF + 0.1µF bypass |
| 14 BYPASS | 2.0V reference output | Stable 2.00V ±2.5mV source for sub-0.8V feedback; bypassed with ≥0.22µF ceramic cap |
| 15 COMP1 | Loop compensation | External RC network stabilizes converter 1 control loop; independent of COMP2 |
| 16 FB1 | Voltage feedback input | Resistive divider input for converter 1; identical functionality to FB2 |
| 17 EN1 | Active-high enable | Independent shutdown control for converter 1; used with EN2 for staggered startup |
| 18,19 DRAIN1 | MOSFET drain connection | High-side switch node in buck mode; low-side switch node in boost mode |
| 20 BST1/VDD1 | Bootstrap/bypass supply | Gate drive supply for converter 1; topology-dependent external component requirements |
| 21 PGOOD1 | Power-good flag | Open-drain output asserting when VOUT1 ≥ 92.5% of setpoint; used for sequencing EN2 |
| 22 PGOOD2 | Power-good flag | Open-drain output asserting when VOUT2 ≥ 92.5% of setpoint; independent of PGOOD1 |
| 23,24 SOURCE1 | MOSFET source connection | Switched node in buck mode; connected to PGND in boost mode |
| 25 SGND | Signal ground | Reference for analog circuitry; tied to EP and PGND at single point near bypass caps |
| 26 PGND | Power ground | Return path for high-current paths (inductors, input/output caps, VL bypass) |
| 27,28 SOURCE2 | MOSFET source connection | Switched node in buck mode; connected to PGND in boost mode |
| EP | Exposed paddle | Internally connected to SGND; soldered to thermal pad for 2°C/W θJC and 2.7W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck/boost converters | Enables flexible multi-rail generation from single input - e.g., 3.3V buck + 12V boost from 12V bus |
| 180° out-of-phase switching | Reduces RMS input ripple current by ~30%, allowing smaller input capacitors and lower EMI filtering cost |
| Internal digital soft-start (2048 cycles) | Eliminates output overshoot and ensures monotonic rise - critical for FPGA and ASIC core rail sequencing |
| CLKOUT + SYNC for four-phase operation | Enables interleaved 4-phase design using two MAX5073ATI+ ICs, cutting input ripple frequency ×4 vs. single-phase |
| Individual EN_/PGOOD_ per converter | Supports precise power-up/down sequencing - e.g., PGOOD1 → EN2 delay prevents brownout on dependent rails |
| Thermally enhanced 28-pin QFN | 2.7W power dissipation at +70°C ambient with θJC = 2°C/W - suitable for compact, high-density telecom modules |
Applications
| Telecom Line Card Power | Networking Line Card Power |
|---|---|
Use Scenario: Generating 3.3V and 2.5V rails from 12V backplane supply in carrier-grade line cards with strict EMI limits. IC Role / Device Role / Timing Role: Dual buck regulator providing isolated, sequenced, and ripple-reduced DC-DC conversion with 180° phase shift. Use Value: Input capacitor size reduced by 40% vs. in-phase dual converters; meets GR-1089 Class B emissions without added shielding. |
Use Scenario: Powering FPGA I/O banks and SerDes cores on 10G/25G switch line cards requiring fast transient response. IC Role / Device Role / Timing Role: Dual-output converter delivering 1.8V (buck) and 12V (boost) with independent enable and PGOOD signaling. Use Value: Digital soft-start prevents FPGA configuration failure during hot-swap; PGOOD1-to-EN2 sequencing ensures clean core rail ramp-up. |
| Power-over-Ethernet (PoE) PD Postregulation | Industrial Edge Controller Power |
Use Scenario: Regulating 52V PoE input to 3.3V/1.2V rails for IEEE 802.3af/at PD devices with limited board area. IC Role / Device Role / Timing Role: Dual buck converter operating from 5.5V–23V (after PoE front-end), supporting 2A/1A loads with thermal robustness. Use Value: –40°C to +125°C rating ensures reliability in unventilated enclosures; 2.2MHz switching allows <10µH inductors and <10µF output caps. |
Use Scenario: Providing isolated 5V and 3.3V supplies for ARM-based PLC modules operating in factory environments with wide ambient swings. IC Role / Device Role / Timing Role: Dual-output DC-DC with independent shutdown and thermal shutdown (TSHDN = +150°C, hysteresis = 30°C). Use Value: Extended temperature qualification eliminates derating concerns; SYNC input enables synchronization to PLC real-time clock for deterministic noise scheduling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck/boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5170QMWX/NOPB | Quad synchronous buck controller (no integrated FETs); requires external MOSFETs and gate drivers; supports higher current (up to 10A per channel) | Targeted at high-power automotive DC-DC (e.g., battery management); lacks integrated soft-start and PGOOD per channel | Select when >2A per channel or AEC-Q100 qualification required; not drop-in due to external FET dependency and different pinout |
| TPS54560DGRT | Single-channel buck converter with integrated 55mΩ FET; 60V max input; no boost capability; no dual-output or phase-shift features | Used for simpler single-rail industrial supplies; lacks sequencing, CLKOUT, or multi-topology flexibility | Select for cost-sensitive single-output designs where dual-rail and topology flexibility are unnecessary |
Compared with LM5170QMWX/NOPB and TPS54560DGRT, the MAX5073ATI+ uniquely combines dual independent buck/boost operation, integrated MOSFETs, 180° phase shift, and automotive-grade temperature range in a single 28-pin QFN - making it optimal for space-constrained, multi-rail telecom and industrial edge applications requiring minimal external components.
Availability
MAX5073ATI+ is available at Aetrix Electronics and suitable for telecom line card power, networking line card power, and Power-over-Ethernet postregulation requiring stable component supply, extended temperature operation, and EMI-conscious layout.
Supply support for MAX5073ATI+ 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, communications, and automotive markets.
The MAX5073 product line was designed for compact, high-efficiency dual-rail DC-DC conversion in space- and thermal-constrained systems such as telecom infrastructure and industrial edge controllers.
FAQ
What is the maximum ambient temperature rating for the MAX5073ATI+?
The MAX5073ATI+ is rated for operation from –40°C to +125°C ambient temperature, meeting automotive AEC-Q100 Grade 1 requirements. Its thermally enhanced 28-pin QFN package dissipates up to 2.7W at +70°C ambient, with derating above that point (21.3mW/°C). This makes the MAX5073ATI+ suitable for under-hood automotive modules and sealed industrial enclosures where airflow is limited.
Can the MAX5073ATI+ operate in boost mode for both outputs simultaneously?
Yes, the MAX5073ATI+ supports independent boost configuration for both converters. Each output can be configured as either buck or boost via external component selection (e.g., inductor placement, diode orientation). In boost mode, converter 1 delivers up to 28V at reduced current (limited by RON1 and thermal budget), while converter 2 supports up to 28V with its own current limit. The datasheet confirms 0.8V–28V output range applies to both modes.
How does the CLKOUT pin enable four-phase operation with the MAX5073ATI+?
The CLKOUT pin of a master MAX5073ATI+ provides a 45° phase-shifted clock signal referenced to converter 2's switching waveform. When fed into the SYNC pin of a slave MAX5073ATI+, it synchronizes the slave's internal oscillator, resulting in four interleaved phases (two per IC, 180° apart within each, 90° between masters). This quadruples effective input ripple frequency, reducing input capacitor RMS current by ~50% compared to dual-phase operation.
What is the purpose of the BYPASS pin on the MAX5073ATI+ and how is it used?
BYPASS is a precision 2.00V ±2.5mV reference output used to set output voltages below the standard 0.8V feedback threshold. By connecting FB1 or FB2 to a resistive divider between BYPASS and the output, designers achieve sub-0.8V regulation (e.g., 0.6V for DDR memory termination). It must be bypassed with ≥0.22µF ceramic capacitor to SGND to maintain stability and noise immunity, as specified in the MAX5073ATI+ datasheet.
Does the MAX5073ATI+ support external frequency synchronization, and what are the constraints?
Yes, the MAX5073ATI+ supports external synchronization via the SYNC pin. The applied fSYNC must be exactly twice the desired per-converter switching frequency (e.g., 2.5MHz SYNC for 1.25MHz fSW). Valid range is 400kHz–4.4MHz, with minimum pulse width of 100ns. ROSC must still be populated (5.6kΩ–56kΩ) and set so 0.2fSYNC < fOSC < 1.2fSYNC, ensuring reliable locking and jitter suppression.
MAX5073ATI+ 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-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1.38A (Switch), 2.3A (Switch)
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (5x5)
MAX5073ATI+ FAQ
1.How can I place an order for MAX5073ATI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5073ATI+ 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 MAX5073ATI+ reliable?
The price and inventory of MAX5073ATI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5073ATI+ is usually 5 days.
3.What payment methods are accepted for MAX5073ATI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5073ATI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5073ATI+?
MAX5073ATI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5073ATI+ 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 MAX5073ATI+?
For technical support, including MAX5073ATI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5073ATI+ requirements.
6.How does Aetrix verify that MAX5073ATI+ is sourced from the original manufacturer or authorized distributors?
All MAX5073ATI+ 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 MAX5073ATI+ meets industry standards.
7.What is the process for return or replacement of MAX5073ATI+?
All MAX5073ATI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5073ATI+, 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 MAX5073ATI+ part is unused and in its original packaging.
Return procedure for MAX5073ATI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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