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Analog Devices Inc./Maxim Integrated MAX5098AATJ+
- Part No.:
- MAX5098AATJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX5098AATJ+.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,117
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Product details
Overview
The MAX5098AATJ+ from Maxim Integrated is a dual-output, high-frequency DC-DC converter with integrated n-channel power MOSFETs, configurable as buck or boost regulators per channel. It delivers up to 2A from Converter 1 and 1A from Converter 2 in buck mode, operates from 4.5V–19V input, supports 200kHz–2.2MHz adjustable switching frequency, and integrates 80V load-dump protection for industrial power systems.
For engineers reviewing the MAX5098AATJ+ datasheet, MAX5098AATJ+ pinout, MAX5098AATJ+ application, or MAX5098AATJ+ equivalent, key selection considerations include dual independent enable/control (EN1/EN2), out-of-phase 180° operation, four-phase master-slave synchronization via CKO/SYNC, internal digital soft-start, and thermal shutdown at +165°C.
Technical Context
The MAX5098AATJ+ implements voltage-mode PWM control with external compensation (via COMP1/COMP2), enabling precise loop tuning for transient response and stability across wide input/output conditions. Each converter features independent feedback (FB1/FB2) with 0.8V reference and ±0.014V accuracy over temperature, supporting output regulation from 0.8V to 0.85×VIN (buck) or VIN to 28V (boost).
Its load-dump protection circuit uses an internal charge pump to drive an external n-channel MOSFET gate (GATE pin), clamping IN_HIGH to ≤21V during transients up to 80V. The device supports synchronization (SYNC input, 400kHz–4400kHz), clock output (CKO, 2×fSW), and 180° phase offset between converters to reduce input ripple and EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V–5.5V or 5.2V–19V; enables flexible supply rail design including automotive battery backup and industrial 12/24V systems |
| Switching Frequency | 200kHz–2.2MHz; programmable via ROSC resistor to optimize size/efficiency trade-off and avoid noise-sensitive bands |
| Output Current (Buck) | 2A (Conv1), 1A (Conv2); limited by package thermal dissipation (2.759W at +70°C) and internal MOSFET RON (195mΩ/280mΩ) |
| Load-Dump Protection | Up to 80V transient handling on IN_HIGH; internal clamp limits voltage to ≤21V while sourcing up to 60mA into external MOSFET gate |
| Thermal Shutdown | +165°C with 20°C hysteresis; ensures safe operation under overload or poor PCB thermal layout |
| Power-Good Outputs | PGOOD1/PGOOD2 open-drain; assert low when output falls below 92.5% of setpoint, enabling reliable power sequencing |
| Standby Current | 7µA (ON/OFF = low); enables ultra-low-power system sleep modes without external disconnect circuitry |
Pinout & Package
The MAX5098AATJ+ is housed in a thermally enhanced 32-pin TQFN-EP (5mm × 5mm) package with exposed pad (EP) connected to SGND for optimal heat dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 32 (SOURCE2) | Converter 2 MOSFET source node | Connect to switched inductor node (buck) or PGND (boost); defines low-side return path for Conv2 power stage |
| 2, 3 (DRAIN2) | Converter 2 MOSFET drain node | Connect to input rail (buck high-side) or inductor/diode junction (boost low-side); carries full output current and switching stress |
| 4 (PGOOD2) | Open-drain power-good indicator | Sinks current when Conv2 output drops <92.5% of regulation point; used for sequencing or fault signaling |
| 10 (GATE) | External MOSFET gate driver output | Drives gate of external n-channel protection FET; outputs ~IN_HIGH + 9V (typ) to ensure full enhancement during load dump |
| 13 (V+) | Main power supply input | Primary input rail (5.2V–19V); bypassed with ≥1µF ceramic capacitor to SGND for stability and noise suppression |
| 14 (VL) | Internal LDO output (5.2V) | Powers internal logic and gate drivers; requires ≥4.7µF ceramic bypass to SGND; dropout ≤550mV at 40mA |
| 28 (CKO) | Master clock output | Outputs 2×fSW signal with 90° phase shift vs. Conv1; enables four-phase interleaving with second MAX5098AATJ+ |
| EP (Exposed Pad) | Thermal and electrical ground | Mandatory connection to SGND plane; largest copper area improves θJA (29°C/W) and reduces junction temperature rise |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck/boost configuration | Each converter selectable as buck (0.8V–0.85×VIN) or boost (VIN–28V), enabling mixed-rail generation from single input |
| 180° out-of-phase switching | Reduces RMS input capacitor current by ~30% and lowers EMI peak amplitude compared to in-phase operation |
| Four-phase master-slave synchronization | CKO output drives SYNC of second device, enabling interleaved 4-phase operation for smoother output current and smaller output capacitors |
| Integrated 80V load-dump protection | Internal charge pump and clamp circuit eliminate need for external TVS or discrete protection IC in harsh automotive/industrial environments |
| Digital soft-start/soft-stop | 64-step internal ramp (2048 fSW cycles) prevents inrush current and output overshoot during power-up/down transitions |
| Individual enable and power-good signals | EN1/EN2 and PGOOD1/PGOOD2 allow precise sequencing of downstream rails and fault isolation per converter |
Applications
| Industrial Motor Control | Railway Signaling Systems |
|---|---|
Use Scenario: Powering microcontroller, gate drivers, and analog sensors in motor drives subjected to 80V load-dump transients during battery disconnection. IC Role / Device Role / Timing Role: Dual-output DC-DC controller providing isolated 5V (2A) and 3.3V (1A) rails with synchronized switching to minimize conducted EMI. Use Value: Eliminates need for external load-dump protection components, reducing BOM count and PCB area while maintaining EN 50155 compliance. | Use Scenario: Generating stable auxiliary supplies for trackside signaling logic and communication modules operating from fluctuating 72V–110V DC traction batteries. IC Role / Device Role / Timing Role: Buck-boost regulator delivering regulated 12V and 5V outputs despite wide input variation and high-voltage transients. Use Value: Internal 80V transient tolerance and -40°C to +125°C operation ensure reliability in uncontrolled outdoor environments without derating. |
| Automotive Body Control Modules | Programmable Logic Controller I/O Modules |
Use Scenario: Supplying power to CAN transceivers, EEPROM, and LED drivers in BCMs where cold-crank (4.5V) and load-dump (80V) events occur. IC Role / Device Role / Timing Role: Dual buck converter with independent EN/PGOOD enabling staggered startup and fault containment between subsystems. Use Value: 7µA standby current extends battery life during vehicle sleep mode; 180° phase shift reduces input capacitor stress during high-current pulses. | Use Scenario: Providing isolated 24V-to-5V/3.3V conversion for digital I/O expansion cards requiring tight regulation and fast transient response. IC Role / Device Role / Timing Role: Synchronized dual converter with external clock input (SYNC) ensuring deterministic timing alignment with PLC master clock. Use Value: Four-phase capability allows parallel operation of two MAX5098AATJ+ devices to double output current while halving output ripple. |
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 |
|---|---|---|---|
| LM5143AQRHFTQ1 | Single synchronous buck controller (no boost mode); supports 3.5V–65V input; no integrated MOSFETs; requires external high-side FETs | Targeted at high-input-voltage automotive applications only; lacks load-dump protection and dual independent outputs | Choose when >65V input or AEC-Q100 Grade 1 qualification is required; not suitable for boost or load-dump scenarios |
| TPS544B25RTER | Dual 20A buck converter with PMBus interface; 4.5V–18V input; no boost capability; no load-dump protection; requires external compensation | Designed for high-current server/telecom applications with digital monitoring; lacks industrial transient robustness | Choose when telemetry, margining, or multi-phase current sharing is needed; not drop-in due to different pinout and control architecture |
Compared with LM5143AQRHFTQ1 and TPS544B25RTER, the MAX5098AATJ+ uniquely combines dual buck/boost flexibility, integrated 80V load-dump protection, and four-phase synchronization-making it optimal for space-constrained industrial systems requiring mixed-rail generation and transient resilience without external protection circuitry.
Availability
The MAX5098AATJ+ is available at Aetrix Electronics and suitable for industrial motor control, railway signaling systems, automotive body control modules, and programmable logic controller I/O modules requiring stable component supply across extended temperature and harsh transient environments.
Supply support for MAX5098AATJ+ 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 demanding industrial, automotive, and communications applications.
The MAX5098A product line targets ruggedized DC-DC conversion in environments subject to automotive load-dump and cold-crank conditions, integrating protection, control, and power stages into a single thermally optimized package.
FAQ
What is the maximum supported switching frequency for the MAX5098AATJ+?
The MAX5098AATJ+ supports a switching frequency range of 200kHz to 2.2MHz, set by an external resistor (ROSC) connected to the OSC pin. At ROSC = 6.81kΩ with FSEL_1 = VL, the typical frequency is 1.85MHz. Frequency accuracy is ±5% for ROSC between 5.6kΩ and 10kΩ, making it suitable for noise-sensitive applications requiring precise EMI control.
How does the MAX5098AATJ+ handle 80V load-dump transients?
The MAX5098AATJ+ handles 80V load-dump transients using its dedicated IN_HIGH pin with internal 21V clamp and GATE driver output. When a transient occurs, the internal charge pump drives the external n-channel MOSFET gate (via GATE pin), causing the MOSFET to absorb the energy. This protects downstream 5V/3.3V circuitry without requiring external TVS diodes or crowbar circuits.
Can the MAX5098AATJ+ operate in boost configuration on both channels simultaneously?
Yes, the MAX5098AATJ+ supports independent boost configuration on both Converter 1 and Converter 2. In boost mode, each output can be adjusted from VIN to 28V using external feedback resistors. SOURCE pins connect to PGND, DRAIN pins connect to the inductor-diode junction, and BST/VDD pins serve as driver bypass nodes-enabling true dual-boost operation for applications like LED drivers or sensor bias supplies.
What thermal performance can be expected from the MAX5098AATJ+ in a standard PCB layout?
In a standard 4-layer PCB with 2oz copper and 2cm² exposed EP copper pour, the MAX5098AATJ+ achieves a junction-to-ambient thermal resistance (θJA) of 29°C/W. At full 2A/1A buck load with V+ = 12V, power dissipation is ~1.8W, resulting in ~52°C junction rise above ambient-well within the +125°C max rating. Derating begins above +70°C at 34.5mW/°C.
Does the MAX5098AATJ+ support power sequencing between its two outputs?
Yes, the MAX5098AATJ+ supports precise power sequencing via independent EN1/EN2 inputs and open-drain PGOOD1/PGOOD2 outputs. For example, connecting PGOOD1 to EN2 ensures Converter 2 starts only after Converter 1 reaches regulation. Similarly, tying PGOOD2 to downstream circuitry enables cascaded enable logic-critical for FPGA, DSP, or multi-rail ASIC power-up sequences.
MAX5098AATJ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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):
- 19V
- Voltage - Output (Min/Fixed):
- 0.8V, 4.5V
- Voltage - Output (Max):
- 16.15V, 28V
- Current - Output:
- 1.75A (Switch), 2.8A (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:
- 32-TQFN (5x5)
MAX5098AATJ+ FAQ
1.How can I place an order for MAX5098AATJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5098AATJ+ 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 MAX5098AATJ+ reliable?
The price and inventory of MAX5098AATJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5098AATJ+ is usually 5 days.
3.What payment methods are accepted for MAX5098AATJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5098AATJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5098AATJ+?
MAX5098AATJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5098AATJ+ 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 MAX5098AATJ+?
For technical support, including MAX5098AATJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5098AATJ+ requirements.
6.How does Aetrix verify that MAX5098AATJ+ is sourced from the original manufacturer or authorized distributors?
All MAX5098AATJ+ 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 MAX5098AATJ+ meets industry standards.
7.What is the process for return or replacement of MAX5098AATJ+?
All MAX5098AATJ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5098AATJ+, 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 MAX5098AATJ+ part is unused and in its original packaging.
Return procedure for MAX5098AATJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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