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Analog Devices Inc./Maxim Integrated MAX17244ETERA+T
- Part No.:
- MAX17244ETERA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX17244ETERA+T.pdf
- Description:
- IC REG BCK PROG/1V 2.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,686
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Product details
Overview
The MAX17244ETERA+T from Maxim Integrated is a 3.5V–36V input, 2.5A synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, fixed 5V/3.3V or adjustable 1V–10V output, 28µA quiescent current, and 42V transient protection. It operates in PWM or PFM mode and supports external synchronization for EMI-sensitive RF power supplies.
For engineers reviewing the MAX17244ETERA+T datasheet, MAX17244ETERA+T pinout, MAX17244ETERA+T application, or MAX17244ETERA+T equivalent, key selection criteria include its 98% max duty cycle for dropout operation, 220kHz–2.2MHz resistor-programmable switching frequency, ±2% fixed-output accuracy, spread-spectrum EMI reduction, and dual-package availability (TQFN-16 and TSSOP-16).
Technical Context
The MAX17244ETERA+T uses current-mode control with selectable PWM or PFM operation: PWM maintains constant switching frequency across load, while PFM disables negative inductor current and skips pulses at light loads to achieve >90% peak efficiency. Its FSYNC pin enables mode selection-AGND for PFM, BIAS or external clock for forced-PWM.
It integrates a 5V BIAS linear regulator (4.7–5.4V output), features cycle-by-cycle current limiting, thermal shutdown with 15°C hysteresis, overvoltage protection at 105% VOUT, and a 180° out-of-phase SYNCOUT for cascaded supply designs. The automatic LX slew-rate adjustment (4ns/8ns) optimizes EMI vs. efficiency trade-offs across operating frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V; withstands 42V transients for ≤50ns-enables robust operation in automotive cold-crank and industrial surge environments. |
| Output Current | Up to 2.5A continuous; peak LX current limit of 3.75A (typ)-supports medium-power point-of-load regulation without external current sensing. |
| Quiescent Current | 28µA (typ) in standby; 5µA (typ) in shutdown-extends battery life in always-on or low-duty-cycle systems. |
| Switching Frequency | 220kHz to 2.2MHz, resistor-programmable via FOSC pin; synchronizable externally-allows layout-optimized inductor/capacitor selection and EMI compliance tuning. |
| Output Voltage Accuracy | ±2% for fixed 5V/3.3V outputs; ±1% FB reference (0.99V–1.015V) for adjustable configurations-ensures stable rail tolerance for MCU, FPGA, and analog circuitry. |
| Efficiency | >90% peak efficiency in both PWM and PFM modes-reduces thermal load and enables compact all-ceramic capacitor designs. |
| Duty Cycle Limit | 98% maximum-supports ultra-low dropout operation (e.g., 5V out from 5.1V input), critical for undervoltage survival in wide-input applications. |
Pinout & Package
MAX17244ETERA+T is available in a 5mm × 5mm, 16-pin TQFN package with exposed pad (EP), and also offered in 16-pin TSSOP. Both packages support −40°C to +85°C operation and require EP connected to PGND for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNCOUT (Pin 10 TSSOP / Pin 9 TQFN) | Open-drain clock output | Provides 180° out-of-phase signal relative to internal oscillator-enables phase-interleaved multi-converter designs to reduce input ripple and EMI. |
| FSYNC (Pin 2 TSSOP / Pin 1 TQFN) | Logic-level sync input | Selects operating mode: AGND = PFM (light-load efficiency); BIAS or external clock = forced-PWM (EMI-controlled fixed frequency). |
| FOSC (Pin 3 TSSOP / Pin 2 TQFN) | Frequency-setting input | Resistor-to-AGND sets switching frequency from 220kHz to 2.2MHz-directly determines inductor size, capacitor count, and core loss vs. conduction loss balance. |
| FB (Pin 5 TSSOP / Pin 4 TQFN) | Feedback input | Monitors output via resistive divider; 1.0V reference enables precise 1V–10V programmability-eliminates need for external error amplifier in most designs. |
| EN (Pin 10 TSSOP / Pin 9 TQFN) | High-voltage enable input | Compatible with 3.5V–42V logic levels-allows direct connection to automotive KL30 or CAN transceiver INH pins without level-shifting. |
| PGOOD (Pin 16 TSSOP / Pin 15 TQFN) | Open-drain power-good flag | Asserts when VOUT ≥95% regulation, deasserts at ≤92%-simplifies sequencing in multi-rail systems with no external comparator required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Reduces BOM count by eliminating external switches; RON_H = 220mΩ (max), RON_L = 3Ω (max)-enables compact, high-efficiency synchronous buck without gate drivers. |
| All-ceramic capacitor support | Enables ultra-small PCB footprint using only MLCCs on input/output-no electrolytic or tantalum capacitors needed for stability or lifetime reliability. |
| Spread-spectrum modulation (factory-enabled) | ±6% frequency dither centered on FOSC-lowers peak EMI emissions without requiring external filtering components or layout changes. |
| Automatic LX slew-rate control | Adjusts HSFET turn-on time to 4ns (fSW >1.1MHz) or 8ns (fSW <1.1MHz)-optimizes EMI suppression while preserving switching efficiency across frequency range. |
| Power-good and high-voltage EN | PGOOD simplifies system power sequencing; EN accepts up to 42V-enables direct integration into 12V/24V automotive or industrial supply rails. |
Applications
| Distributed Supply Regulation | Wall Transformer Regulation |
|---|---|
Use Scenario: Powering multiple subsystems (e.g., sensors, comms ICs, actuators) from a shared 24V industrial bus with local voltage conversion. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5V/3.3V rails with tight load/line regulation and fast transient response. Use Value: 98% duty cycle ensures uninterrupted operation during brownouts; PFM mode cuts standby current to 28µA-extending uptime in unattended equipment. |
Use Scenario: Replacing linear regulators or discrete switchers in AC/DC wall adapters powering consumer electronics (e.g., set-top boxes, routers). IC Role / Device Role / Timing Role: High-efficiency primary DC-DC stage converting rectified 12–36V DC to regulated 5V/3.3V output. Use Value: >90% peak efficiency and all-ceramic design reduce heat and size; 42V transient rating handles rectifier overshoot without clamping circuits. |
| General-Purpose Point-of-Load | RF Transceiver Power Supply |
Use Scenario: Providing clean, low-noise 3.3V or adjustable 1.8V/2.5V rails directly adjacent to noise-sensitive processors or ADCs. IC Role / Device Role / Timing Role: Local voltage regulator with low quiescent current and high PSRR at light loads. Use Value: 28µA IQ minimizes idle power; ±2% output accuracy ensures reliable digital logic margins; SYNCOUT enables multi-phase coordination. |
Use Scenario: Powering LTE/Wi-Fi/BLE transceivers where strict EMI limits apply and frequency agility must be avoided. IC Role / Device Role / Timing Role: Fixed-frequency FPWM supply synchronized to host system clock to eliminate spectral spreading. Use Value: Forced-PWM mode eliminates frequency variation; spread-spectrum option (S-version) further reduces peak emissions-meets CISPR-22 Class B requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1.5A output, 1.2MHz fixed freq, no PFM mode, AEC-Q100 qualified | Better suited for automotive under-hood use; lacks light-load PFM efficiency and adjustable frequency | Choose for automotive temperature grade and higher VIN; avoid if 2.5A output or 28µA IQ are required. |
| TPS54240DGQR | 3.5V–42V input, 2.5A, 100kHz–2.5MHz adjustable freq, 65µA IQ, no spread spectrum | Higher quiescent current; no integrated BIAS LDO or SYNCOUT; requires external compensation | Choose for wider frequency range and lower cost; avoid if ultra-low IQ, EMI reduction, or cascaded supply capability are critical. |
Compared with LM5164QPWPRQ1 and TPS54240DGQR, the MAX17244ETERA+T uniquely combines 2.5A output, 28µA quiescent current, PFM/PWM mode flexibility, spread-spectrum EMI control, and 180° SYNCOUT-all in a single 5mm × 5mm package-making it optimal for space-constrained, EMI-sensitive, and battery-aware industrial and communications designs.
Availability
MAX17244ETERA+T is available at Aetrix Electronics and suitable for distributed supply regulation, wall transformer replacement, and general-purpose point-of-load applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX17244ETERA+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, designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX17244ETERA+T belongs to Maxim's high-efficiency, wide-input synchronous buck converter family-engineered for applications demanding ultra-low quiescent current, robust transient handling, and EMI-conscious power delivery in space- and thermally-constrained environments.
FAQ
What is the maximum input voltage the MAX17244ETERA+T can withstand without damage?
The MAX17244ETERA+T has an absolute maximum input rating of 42V for transient events lasting ≤50ns under normal operation and full load. Its continuous operating input range is 3.5V to 36V. This 42V transient protection allows safe deployment in automotive cold-crank (ISO 16750-2) and industrial surge environments without external TVS diodes in many cases. The MAX17244ETERA+T monitors internal stress and activates protection mechanisms-including cycle-by-cycle current limit and thermal shutdown-to prevent permanent damage during sustained overvoltage conditions.
Can the MAX17244ETERA+T operate with a 5V input to generate a 3.3V output?
Yes, the MAX17244ETERA+T can operate with a 5V input to generate a 3.3V output, but only in dropout mode using its 98% maximum duty cycle. At VIN = 5V and VOUT = 3.3V, the theoretical minimum input for regulation is ~3.37V (accounting for RON_H drop), so 5V provides sufficient headroom. However, efficiency will be reduced due to conduction losses in the high-side MOSFET, and thermal performance must be verified per the θJA = 35°C/W (TQFN) specification. The MAX17244ETERA+T remains fully functional and protected in this configuration.
Does the MAX17244ETERA+T require an external Schottky diode?
No, the MAX17244ETERA+T does not require an external Schottky diode because it integrates both high-side and low-side MOSFETs for fully synchronous rectification. The device's internal low-side MOSFET enables efficient freewheeling during the off-time, eliminating body-diode conduction losses. External diodes are unnecessary and would degrade performance. However, the datasheet notes that an external Schottky may be used *in parallel* with the low-side FET in specific high-reliability or fault-tolerant designs-but this is optional and not required for standard operation of the MAX17244ETERA+T.
How does the FSYNC pin affect efficiency and EMI in the MAX17244ETERA+T?
The FSYNC pin directly controls the MAX17244ETERA+T's operating mode: connecting it to AGND enables PFM mode, which maximizes light-load efficiency (>85% at 1mA) by skipping pulses and disabling negative inductor current; connecting it to BIAS or an external clock forces fixed-frequency PWM mode, which eliminates frequency variation to minimize broadband EMI-critical for RF transceiver supplies. In PWM mode, the MAX17244ETERA+T maintains constant fSW regardless of load, enabling predictable filter design and meeting stringent CISPR emission limits.
Is the MAX17244ETERA+T pin-compatible with other devices in the MAX1724x family?
The MAX17244ETERA+T shares identical pinout and package dimensions (TQFN-16 and TSSOP-16) with the MAX17242/MAX17243 variants, but functional differences exist: MAX17242 offers only fixed 5V output, MAX17243 supports 3.3V/5V selection via pin strapping, while MAX17244ETERA+T supports both fixed outputs *and* resistor-programmable 1V–10V via FB. All share identical EN, PGOOD, SYNCOUT, FSYNC, and FOSC functionality. Therefore, MAX17244ETERA+T is a superset replacement-hardware-compatible with no PCB change-but firmware or BOM updates may be needed to leverage its full programmability.
MAX17244ETERA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (3.3V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 400kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX17244ETERA+T FAQ
1.How can I place an order for MAX17244ETERA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17244ETERA+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 MAX17244ETERA+T reliable?
The price and inventory of MAX17244ETERA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17244ETERA+T is usually 5 days.
3.What payment methods are accepted for MAX17244ETERA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17244ETERA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17244ETERA+T?
MAX17244ETERA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17244ETERA+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 MAX17244ETERA+T?
For technical support, including MAX17244ETERA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17244ETERA+T requirements.
6.How does Aetrix verify that MAX17244ETERA+T is sourced from the original manufacturer or authorized distributors?
All MAX17244ETERA+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 MAX17244ETERA+T meets industry standards.
7.What is the process for return or replacement of MAX17244ETERA+T?
All MAX17244ETERA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17244ETERA+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 MAX17244ETERA+T part is unused and in its original packaging.
Return procedure for MAX17244ETERA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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