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Analog Devices Inc./Maxim Integrated MAX5073ETI+
- Part No.:
- MAX5073ETI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX5073ETI+.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:310
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Product details
Overview
MAX5073ETI+ from Maxim Integrated is a dual-output DC-DC converter with integrated high-side n-channel power MOSFETs, configurable as buck or boost for each output. It operates from 5.5V to 23V input, delivers up to 2A/1A in buck mode, supports 200kHz–2.2MHz switching, and features 180° out-of-phase operation to reduce input ripple. It is used in telecom line cards requiring compact, thermally robust dual-rail regulation.
For engineers reviewing the MAX5073ETI+ datasheet, MAX5073ETI+ pinout, MAX5073ETI+ application, or MAX5073ETI+ equivalent, key selection considerations include its -40°C to +125°C automotive-grade rating, 28-pin thin QFN-EP package with exposed pad, dual independent soft-start and power-good outputs, and master-slave four-phase capability via CLKOUT/SYNC.
Technical Context
The MAX5073ETI+ implements two independent voltage-mode PWM controllers with internal transconductance error amplifiers (gM = 1.2–2.9 mS), programmable oscillator (fOSC = 400kHz–4.4MHz), and digital soft-start (2048 fOSC cycles). Each converter uses nonsynchronous rectification with external Schottky diodes.
It supports 180° out-of-phase switching to minimize input capacitor RMS ripple current, and enables four-phase operation via CLKOUT (45° phase-shifted) synchronized to a slave device's SYNC input. The internal 5.2V VL regulator powers gate drivers and control circuitry, with dropout behavior below 5.5V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 23V - supports wide industrial and automotive supply rails without external pre-regulation |
| Buck Output Current (Conv1/Conv2) | 2A / 1A - sufficient for FPGA core and I/O rail generation in telecom line cards |
| Switching Frequency Range | 200kHz to 2.2MHz - allows EMI-sensitive radio power supplies to avoid interference bands |
| Output Voltage Accuracy | ±1% - ensures stable regulation for precision analog and digital loads |
| Thermal Performance | 2.7W dissipation at +70°C ambient - enabled by thermally enhanced 28-pin thin QFN-EP package |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial environments |
| On-Resistance (RON1/RON2) | 290mΩ / 630mΩ - impacts conduction loss and thermal rise in high-current buck operation |
Pinout & Package
MAX5073ETI+ is housed in a 5mm × 5mm, 28-pin thin QFN-EP package with exposed paddle soldered to SGND for optimal thermal performance (θJC = 2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKOUT (Pin 1) | Clock output | 45° phase-shifted signal referenced to Converter 2's SOURCE2; enables four-phase master-slave configuration |
| BST2/VDD2 (Pin 2) | Bootstrap/bypass supply | Provides gate drive voltage for Converter 2's high-side MOSFET (buck) or bypass for low-side switch (boost) |
| DRAIN2 (Pins 3,4) | Internal MOSFET drain | Connects to input rail (buck) or inductor-diode node (boost); rated for 3A peak for 1ms |
| EN2 (Pin 5) | Active-high enable | Individually disables Converter 2; TTL-compatible; used for power sequencing with PGOOD1 |
| FB2 (Pin 6) | Voltage feedback input | Sets output voltage via resistive divider; reference = 0.8V ±0.012V over full temperature range |
| COMP2 (Pin 7) | Loop compensation | Connects external RC network to stabilize Converter 2's voltage-mode control loop |
| SYNC (Pin 8) | External clock input | Accepts 400kHz–4.4MHz TTL signal; sets individual converter frequency to fSYNC/2 |
| N.C. (Pin 9) | No connection | Not internally bonded; must be left floating or tied to SGND per layout best practice |
| OSC (Pin 10) | Oscillator frequency set | ROSC resistor (10kΩ–60kΩ) programs internal oscillator; required even when SYNC is used |
| V+ (Pin 11) | Main input supply | Primary power input (5.5V–23V); bypassed with ≥0.1µF ceramic capacitor close to pin |
| VL (Pins 12,13) | Internal 5.2V LDO output | Powers gate drivers and logic; requires 0.1µF (to PGND) + 4.7µF (to SGND) bypassing |
| BYPASS (Pin 14) | 2.0V reference output | Stable 2.00V ±2mV source for sub-0.8V output programming; bypass with ≥0.22µF ceramic |
| COMP1 (Pin 15) | Loop compensation | Connects external RC network to stabilize Converter 1's voltage-mode control loop |
| FB1 (Pin 16) | Voltage feedback input | Sets output voltage via resistive divider; identical 0.8V reference tolerance as FB2 |
| EN1 (Pin 17) | Active-high enable | Individually disables Converter 1; supports sequencing with EN2 and PGOOD outputs |
| DRAIN1 (Pins 18,19) | Internal MOSFET drain | Connects to input rail (buck) or inductor-diode node (boost); rated for 5A peak for 1ms |
| BST1/VDD1 (Pin 20) | Bootstrap/bypass supply | Provides gate drive voltage for Converter 1's high-side MOSFET (buck) or bypass for low-side switch (boost) |
| PGOOD1 (Pin 21) | Power-good flag | Open-drain output asserts low when VOUT1 falls below 92.5% of set point; sinks 3mA |
| PGOOD2 (Pin 22) | Power-good flag | Open-drain output asserts low when VOUT2 falls below 92.5% of set point; sinks 3mA |
| SOURCE1 (Pins 23,24) | Internal MOSFET source | Connects to switched inductor node (buck) or PGND (boost); forms return path for high-side switch |
| SGND (Pin 25) | Signal ground | Reference for all analog and logic circuits; must connect to exposed paddle (EP) |
| PGND (Pin 26) | Power ground | Return for high-current paths (input cap, output cap, VL bypass); tie to SGND at single point |
| SOURCE2 (Pins 27,28) | Internal MOSFET source | Connects to switched inductor node (buck) or PGND (boost); forms return path for high-side switch |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck/boost configuration | Each output can be independently set as buck (0.8V–VIN) or boost (VIN–28V), enabling flexible rail generation from one IC |
| 180° out-of-phase switching | Reduces input capacitor RMS ripple current by ~30%, allowing smaller, lower-cost bulk capacitance |
| Digital soft-start (2048-cycle ramp) | Eliminates output overshoot and inrush current during startup; ensures monotonic VOUT rise |
| Four-phase master-slave support | CLKOUT (45° phase shift) + SYNC interface enables interleaved operation across two MAX5073ETI+ devices |
| Automotive-grade thermal rating | Rated for -40°C to +125°C junction operation with thermal shutdown at +150°C and 30°C hysteresis |
| Integrated power-good and enable controls | Individual EN1/EN2 and PGOOD1/PGOOD2 allow precise sequencing of dual outputs in telecom and networking systems |
Applications
| Telecom Line Card | Networking Line Card |
|---|---|
Use Scenario: Dual-rail power delivery on dense, space-constrained line cards with strict EMI limits. IC Role / Device Role / Timing Role: Dual-output DC-DC controller generating 3.3V/2A and 2.5V/1A rails from 12V backplane supply. Use Value: 180° out-of-phase operation cuts input ripple current, reducing required bulk capacitance and shielding cost. | Use Scenario: Compact, thermally efficient power solution for multi-port Ethernet switches operating in uncontrolled environments. IC Role / Device Role / Timing Role: Configurable buck/boost regulator supplying 1.8V core and 3.3V I/O rails from 5.5V–16V input. Use Value: -40°C to +125°C rating and 2.7W thermal dissipation ensure reliability in fanless chassis designs. |
| Power-Over-Ethernet PD | Industrial Embedded Control |
Use Scenario: Postregulation stage in PoE-powered devices (e.g., IP cameras, wireless APs) where input voltage varies widely (12V–57V). IC Role / Device Role / Timing Role: Boost converter generating stable 12V output from low-voltage PoE-derived rail (e.g., 5.5V–12V). Use Value: 28V maximum boost output and ±1% accuracy maintain compliance with IEEE 802.3af/at/ bt load requirements. | Use Scenario: Dual-rail supply for microcontroller-based PLC modules requiring high reliability and long service life. IC Role / Device Role / Timing Role: Buck converter pair delivering 5V/2A and 3.3V/1A from 24V industrial bus, with sequencing via EN1/EN2 and PGOOD1. Use Value: Individual shutdown and power-good flags simplify system-level fault detection and safe power-up sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5119MT/NOPB | Two external N-channel MOSFET drivers; no integrated FETs; requires external bootstrap diodes and gate drivers | Higher design complexity but greater flexibility in FET selection and thermal management | Choose LM5119MT/NOPB when higher efficiency (>90% at 12V→3.3V/2A) or >150°C operation is required |
| TPS54290PWPR | Single 2.5A buck controller with integrated 100mΩ FETs; no boost capability; fixed 500kHz–2.2MHz frequency | Lower channel count; lacks second independent output and boost mode | Choose TPS54290PWPR only for single-rail applications where size and cost outweigh dual-output flexibility |
Compared with LM5119MT/NOPB and TPS54290PWPR, the MAX5073ETI+ uniquely integrates two high-side MOSFETs with buck/boost configurability, 180° interleaving, and automotive-grade thermal rating - making it optimal for space- and reliability-critical dual-rail systems where external FET count and board area must be minimized.
Availability
MAX5073ETI+ is available at Aetrix Electronics and suitable for telecom line card, networking line card, and Power-Over-Ethernet postregulation applications requiring stable component supply, extended temperature operation, and compact dual-output power conversion.
Supply support for MAX5073ETI+ 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) designs high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets.
The MAX5073 product line delivers highly integrated dual-output DC-DC controllers targeting space-constrained, thermally demanding applications such as telecom infrastructure and automotive ADAS modules.
FAQ
What is the maximum output voltage achievable with MAX5073ETI+ in boost mode?
The MAX5073ETI+ supports a maximum boost output voltage of 28V, as specified in the General Description and Electrical Characteristics sections. This limit applies regardless of input voltage within the 5.5V–23V range and is enforced by internal protection circuitry to prevent overstress of the integrated MOSFETs and external components. Operation beyond 28V is not supported and may damage the MAX5073ETI+ or connected circuitry.
Can MAX5073ETI+ operate with an input voltage below 5.5V?
Yes, the MAX5073ETI+ can operate with input voltages as low as 4.5V, but only when V+ is connected directly to the VL pin (as stated in Note 2 of the Electrical Characteristics). In this configuration, the internal 5.2V LDO operates in dropout mode, tracking V+, and the device relies on the lower input range specification (4.5V–5.5V). Below 4.5V, UVLO prevents operation. For inputs above 5.5V, V+ and VL must remain separate.
How does the 180° out-of-phase operation of MAX5073ETI+ reduce input ripple current?
The 180° out-of-phase switching of the two converters in the MAX5073ETI+ causes their input current peaks to occur at opposite times within each cycle. This cancellation reduces the RMS value of total input ripple current by approximately 30% compared to in-phase operation, lowering stress on the input capacitor and permitting smaller, lower-cost bulk capacitance - a critical advantage in space-constrained telecom and networking line cards.
What is the purpose of the BYPASS pin on MAX5073ETI+ and how is it used?
Pin 14 (BYPASS) on the MAX5073ETI+ provides a stable 2.00V ±2mV reference output. Its primary use is to enable output voltages below the standard 0.8V feedback reference - by connecting FB1 or FB2 to a resistive divider between BYPASS and the output, designers can program sub-0.8V rails (e.g., 0.6V for modern CPU cores). It must be bypassed with ≥0.22µF ceramic capacitance to SGND for noise immunity.
Does MAX5073ETI+ support external synchronization, and what are the timing constraints?
Yes, the MAX5073ETI+ supports external synchronization via the SYNC pin (Pin 8), which accepts TTL-level signals from 400kHz to 4.4MHz. The internal switching frequency of each converter equals half the SYNC frequency (fSW = fSYNC/2). To ensure stable locking, the internal oscillator resistor ROSC must be selected so that 0.2fSYNC < fOSC < 1.2fSYNC, and ROSC remains mandatory even when SYNC is active.
MAX5073ETI+ 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (5x5)
MAX5073ETI+ FAQ
1.How can I place an order for MAX5073ETI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5073ETI+ 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 MAX5073ETI+ reliable?
The price and inventory of MAX5073ETI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5073ETI+ is usually 5 days.
3.What payment methods are accepted for MAX5073ETI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5073ETI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5073ETI+?
MAX5073ETI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5073ETI+ 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 MAX5073ETI+?
For technical support, including MAX5073ETI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5073ETI+ requirements.
6.How does Aetrix verify that MAX5073ETI+ is sourced from the original manufacturer or authorized distributors?
All MAX5073ETI+ 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 MAX5073ETI+ meets industry standards.
7.What is the process for return or replacement of MAX5073ETI+?
All MAX5073ETI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5073ETI+, 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 MAX5073ETI+ part is unused and in its original packaging.
Return procedure for MAX5073ETI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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