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Analog Devices Inc./Maxim Integrated MAX17577ATC+T
- Part No.:
- MAX17577ATC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX17577ATC+T.pdf
- Description:
- IC REG BUCK ADJ 1A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,229
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Product details
Overview
The MAX17577ATC+T from Analog Devices is a high-voltage, synchronous, inverting DC-DC converter IC with integrated high-side and low-side nMOSFETs, peak current-mode control, internal compensation, and system-ground-referenced I/O. It delivers up to 1A output current, supports adjustable negative output voltages from –0.9V to –36V, operates across a 4.5V to (60V – |VOUT|) input range, and achieves 90.6% peak efficiency in continuous conduction mode (CCM). It is used in industrial gate-drive circuits requiring stable, compact, negative-bias power rails.
For engineers reviewing the MAX17577ATC+T datasheet, MAX17577ATC+T pinout, MAX17577ATC+T application, or MAX17577ATC+T equivalent, key selection considerations include its CCM-only operation, ±1.3% feedback regulation accuracy over –40°C to +125°C, 6.2μA shutdown current, 400kHz–2.2MHz programmable switching frequency, and built-in hiccup-mode overload protection with monotonic startup into prebiased outputs.
Technical Context
The MAX17577ATC+T implements a peak current-mode control architecture with fixed-frequency CCM operation across all load conditions, enabling predictable EMI behavior and simplified filtering. Its internal error amplifier compares FB voltage to a 0.9V reference, modulating high-side MOSFET on-time to regulate output; soft-start (SS) controls ramp rate, while EN/UVLO, RESET, and RT/SYNC pins are referenced to system ground-eliminating external level shifters.
It integrates a 5V internal LDO (VCC) powered from SOUT, with 4.75V–5.25V output and 100mA current limit, and features dual MOSFETs with RDS-ONH = 330mΩ (typ) and RDS-ONL = 163mΩ (typ). Protection includes hiccup-mode OCP triggered at 2.4A peak current and 2.65A runaway limit, thermal shutdown at +165°C with 10°C hysteresis, and RESET assertion when FB falls below 92% of regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Polarity | Inverting: generates regulated negative output voltage (–0.9V to –36V) from positive input |
| Input Voltage Range | 4.5V to (60V – |VOUT|): enables wide-input operation-for example, up to 48V input for –12V output |
| Max Output Current | 1A continuous: sufficient for gate drivers, analog biasing, and isolated controller auxiliary supplies |
| Switching Frequency | 400kHz–2.2MHz adjustable via RT/SYNC resistor or external clock sync: supports compact magnetics and EMI optimization |
| Feedback Accuracy | ±1.3% over –40°C to +125°C: ensures stable regulation in harsh industrial environments without calibration |
| Shutdown Current | 6.2μA: minimizes standby power loss in always-on systems with enable-controlled sequencing |
| Thermal Protection | +165°C shutdown with +10°C hysteresis: prevents permanent damage during sustained overload or poor heatsinking |
Pinout & Package
MAX17577ATC+T is housed in a thermally enhanced 12-pin TDFN-EP package (3mm × 3mm), with exposed pad (EP) connected to SOUT for improved thermal dissipation (θJA = 33°C/W on multilayer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power input node | Accepts 4.5V–(60V–|VOUT|); requires ≥2.2μF X7R ceramic decoupling close to pin |
| 2 EN/UVLO | Enable & input UVLO control | System-ground-referenced; rising threshold 1.229V (typ); enables direct resistor-divider programming |
| 3 RESET | Open-drain fault status output | Pulls low if VOUT drops below 92% regulation or during thermal shutdown; requires external 10kΩ pullup |
| 4 SS | Soft-start timing input | Capacitor-to-SOUT sets monotonic startup; prevents inrush into prebiased outputs |
| 5 VCC | Internal 5V LDO output | Supplies internal circuitry; bypassed with 2.2μF ceramic to SOUT; not for external loading |
| 6 RT/SYNC | Frequency programming/sync input | Resistor-to-SOUT sets fSW (400kHz–2.2MHz); also accepts AC-coupled external clock (1.1–1.4× fSW) |
| 7 FB | Voltage feedback input | Monitors output via resistor divider; 0.9V regulation threshold; ±1.3% accuracy over full temperature range |
| 8 SOUT | Reference node for control circuitry | Kelvin connection point for output capacitor; serves as local ground reference for VCC, RESET, and FB |
| 9 GND | System power ground | Must be star-connected to power ground plane; separate from signal ground to minimize noise coupling |
| 10 BST | Bootstrap supply for high-side driver | Requires 0.1μF ceramic capacitor between BST and LX; enables efficient high-side nMOSFET gate drive |
| 11 LX | Switching node | Connects to inductor switch node; high-impedance during shutdown; carries peak currents up to 1.6A RMS |
| 12 OUT | Negative output terminal | Low-side MOSFET source node; connects directly to output capacitor negative terminal and system ground |
| EP | Exposed thermal pad | Must be soldered to SOUT net and connected to large copper area with ≥4 thermal vias for reliable 1A operation |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous inverting topology | Eliminates external diode; enables high efficiency (90.6% peak) and compact all-ceramic designs |
| System-ground-referenced I/O | EN/UVLO, RESET, and RT/SYNC operate relative to GND-not SOUT-removing need for level shifters |
| Internal loop compensation | Reduces BOM count by eliminating external compensation network; simplifies design validation |
| Hiccup-mode overload protection | Shuts down for 32,768 cycles at half frequency upon short-circuit, limiting power dissipation and junction temperature |
| Monotonic startup into prebiased output | Prevents reverse current flow during hot-plug or brownout recovery; critical for motion control and PLC backplanes |
| CISPR 32 Class B compliance | Meets conducted/radiated emissions limits without additional shielding or filtering in typical industrial layouts |
Applications
| Industrial Gate-Drive Power | Motion Control Auxiliary Supply |
|---|---|
|
Use Scenario: Providing isolated –15V bias to IGBT or SiC MOSFET gate drivers in servo inverters and motor drives. IC Role / Device Role / Timing Role: Inverting DC-DC converter generating stable negative rail from 24V or 48V bus; regulates during PWM transients. Use Value: Enables fast, symmetric turn-on/turn-off of power switches with minimal shoot-through risk; CCM operation avoids variable-frequency jitter in timing-critical gate signals. |
Use Scenario: Powering position encoder interfaces and resolver-to-digital converters in CNC machines and robotic joints. IC Role / Device Role / Timing Role: Negative auxiliary supply delivering 1A at –5V or –12V from main DC bus; maintains regulation during rapid load steps. Use Value: ±1.3% feedback accuracy ensures consistent ADC reference stability; hiccup protection prevents latch-up during encoder cable faults. |
| Wall-Transformer Replacement | High-Voltage Single-Board System |
|
Use Scenario: Replacing bulky, inefficient wall-wart transformers in DIN-rail mounted PLC I/O modules. IC Role / Device Role / Timing Role: Compact inverting regulator converting 24V system rail to –12V sensor bias; operates continuously at full load. Use Value: 3mm × 3mm TDFN-EP package reduces footprint by >70% vs. discrete solutions; 6.2μA shutdown current supports low-power sleep modes. |
Use Scenario: Generating multiple isolated negative rails on high-density industrial compute boards with 48V backplane. IC Role / Device Role / Timing Role: Primary inverting stage feeding downstream LDOs or charge pumps; handles wide input variation due to cable drop. Use Value: 4.5V–(60V–|VOUT|) input range accommodates 48V ±10% tolerance and transient surges; RT/SYNC sync enables multi-rail EMI alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17578ATC+T | Discontinuous conduction mode (DCM) at light loads; lower no-load current (1.5mA vs. 6.3mA); same pinout and package | Better light-load efficiency in battery-backed or intermittent-use systems; less suitable for constant-load industrial gate drives | Select MAX17578ATC+T only when >30% of operating time occurs below 100mA load; otherwise MAX17577ATC+T ensures stable CCM timing. |
| LM5180QDGSRQ1 | Non-synchronous buck-boost; requires external Schottky diode; wider input (4.5V–65V); no integrated low-side FET | Lacks inverting capability; requires external inverter stage for negative output; higher BOM cost and layout complexity | Use LM5180QDGSRQ1 only if existing design already uses buck-boost topology and negative output is generated separately; not a functional substitute for MAX17577ATC+T's integrated inverting function. |
Compared with MAX17578ATC+T, the MAX17577ATC+T guarantees fixed-frequency CCM operation essential for EMI-sensitive gate-drive timing, while LM5180QDGSRQ1 lacks integrated inversion and requires additional components to achieve equivalent negative output functionality-increasing size, cost, and failure points.
Availability
MAX17577ATC+T is available at Aetrix Electronics and suitable for industrial control power supply, gate-drive circuits, motion control, and wall-transformer replacement applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX17577ATC+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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and conversion technologies.
The MAX17577ATC+T belongs to the Himalaya series of high-voltage DC-DC regulators, designed specifically for compact, efficient, and robust power conversion in harsh industrial environments where reliability, thermal resilience, and EMI control are critical.
FAQ
What is the maximum input voltage supported by the MAX17577ATC+T for a –24V output?
The MAX17577ATC+T supports a maximum input voltage of 60V minus the absolute value of the output voltage. For a –24V output, the maximum input is 60V – 24V = 36V. This constraint ensures internal voltage ratings are not exceeded; exceeding 36V input with –24V output risks damage to the LX-to-OUT or BST-to-OUT terminals per Absolute Maximum Ratings.
Does the MAX17577ATC+T support synchronization to an external clock, and what are the requirements?
Yes, the MAX17577ATC+T supports external clock synchronization via the RT/SYNC pin. The external clock frequency must be between 1.1× and 1.4× the resistor-programmed switching frequency. The clock must be AC-coupled, have pulse width ≥100ns, and duty cycle between 10% and 90%. The amplitude depends on duty cycle-e.g., >1.3V for 20%–80% DSYNC-and a series capacitor (CSYNC) must be calculated per the datasheet equations.
Can the MAX17577ATC+T start up into a prebiased output, and how does it behave?
Yes, the MAX17577ATC+T supports monotonic startup into a prebiased output. During startup, both high-side and low-side nMOSFETs remain off until the SS pin voltage exceeds the FB pin voltage. Only then does soft-start commence, allowing VFB and VOUT to ramp up smoothly without sinking current from the precharged rail-critical for hot-swap and redundant power systems.
What is the purpose of the SOUT pin, and how must it be connected?
The SOUT pin serves as the local reference node for internal control circuitry-including VCC regulation, RESET comparator, and FB amplifier-and must be connected to the negative terminal of the output capacitor using a Kelvin sense path. It is not system ground; connecting SOUT directly to GND violates the internal reference architecture and causes regulation failure. Layout best practice uses dedicated low-impedance trace from SOUT to output cap cathode.
How does the MAX17577ATC+T implement overload protection, and what triggers hiccup mode?
The MAX17577ATC+T uses dual-level overcurrent protection: cycle-by-cycle peak current limiting at 2.4A (IPEAK-LIMIT) and runaway current limiting at 2.65A (IRUNAWAY-LIMIT). Hiccup mode activates after one occurrence of the runaway limit-or if FB falls below 0.58V (VFB-HICF) post-soft-start. The device then suspends switching for 32,768 clock cycles at half frequency before retrying soft-start, minimizing thermal stress during sustained shorts.
MAX17577ATC+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Negative
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- -0.9V
- Voltage - Output (Max):
- -36V
- Current - Output:
- 1A
- Frequency - Switching:
- 400kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TDFN (3x3)
MAX17577ATC+T FAQ
1.How can I place an order for MAX17577ATC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17577ATC+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 MAX17577ATC+T reliable?
The price and inventory of MAX17577ATC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17577ATC+T is usually 5 days.
3.What payment methods are accepted for MAX17577ATC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17577ATC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17577ATC+T?
MAX17577ATC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17577ATC+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 MAX17577ATC+T?
For technical support, including MAX17577ATC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17577ATC+T requirements.
6.How does Aetrix verify that MAX17577ATC+T is sourced from the original manufacturer or authorized distributors?
All MAX17577ATC+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 MAX17577ATC+T meets industry standards.
7.What is the process for return or replacement of MAX17577ATC+T?
All MAX17577ATC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17577ATC+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 MAX17577ATC+T part is unused and in its original packaging.
Return procedure for MAX17577ATC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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