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Analog Devices Inc./Maxim Integrated MAX5099ATJ+
- Part No.:
- MAX5099ATJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX5099ATJ+.pdf
- Description:
- IC REG BUCK ADJ 1A/2A DL 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,510
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Product details
Overview
The MAX5099ATJ+ from Maxim Integrated is a dual-output, automotive-grade synchronous buck converter IC with integrated high-side MOSFETs, 80V load-dump protection, and 2.2MHz programmable switching frequency. It delivers up to 2A on Channel 1 and 1A on Channel 2 across a 4.5V–19V input range, operating from –40°C to +125°C in a 32-pin TQFN-EP package. It is designed for demanding automotive power rails such as AM/FM radio and instrument cluster displays.
For engineers reviewing the MAX5099ATJ+ datasheet, MAX5099ATJ+ pinout, MAX5099ATJ+ application, or MAX5099ATJ+ equivalent, this page provides verified technical context, validated pin functions, confirmed automotive transient protection behavior, and real-world design implications of its out-of-phase operation, voltage-mode control loop, and integrated load-dump gate driver.
Technical Context
The MAX5099ATJ+ implements two independent voltage-mode PWM controllers with external compensation (via COMP1/COMP2), enabling precise loop tuning for transient response and stability across varying loads and temperatures. Each channel features dedicated enable (EN1/EN2), power-good (PGOOD1/PGOOD2), and feedback (FB1/FB2) pins, supporting flexible sequencing and output regulation down to 0.8V.
Its integrated load-dump protection uses an internal charge pump driving an external n-channel MOSFET via the GATE pin, clamping IN_HIGH to ≤21V during transients up to 80V. The device supports synchronization (SYNC input), adjustable frequency (200kHz–2.2MHz), and 180° out-of-phase operation (FSEL_1 = VL) to reduce input ripple and EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V–19V - supports wide automotive battery range including cold-crank (4.5V) and load-dump (up to 19V sustained) |
| Output Current Capability | Up to 2A (Ch1) and 1A (Ch2) - limited by thermal dissipation in 5mm × 5mm TQFN-EP package |
| Switching Frequency | 200kHz–2.2MHz - programmable via ROSC resistor or SYNC input; enables AM-band avoidance and compact magnetics |
| Load-Dump Protection | Handles 80V transients - internal clamp circuit protects IN_HIGH rail; external MOSFET absorbs energy via GATE-driven gate drive |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress requirements |
| Efficiency (Typical) | 85% at 1.5A/5V & 0.75A/3.3V - measured at 300kHz, V+ = 12V, confirming low conduction and switching losses |
| Standby Current | 7µA (ON/OFF = low) - enables ultra-low-power shutdown mode for battery-sensitive systems |
Pinout & Package
The MAX5099ATJ+ is housed in a thermally enhanced, exposed-pad 32-pin TQFN package (5mm × 5mm, 0.5mm pitch), with EP connected to SGND for optimal thermal performance (θJA = 29.0°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 32 (SOURCE2) | Converter 2 MOSFET source node | Connects to switched side of Ch2 inductor in buck topology; defines low-side reference for DL2 driver |
| 10 (GATE) | External load-dump MOSFET gate driver | Outputs ~IN_HIGH + 9V (typ) to drive n-channel protection FET; active only when ON/OFF = high |
| 11 (ON/OFF) | n-Channel enable for load-dump circuit | Drives external protection MOSFET; pulling low disables both converters and reduces IQ to 7µA |
| 13 (V+) | Main power input rail | Supplies internal logic, drivers, and high-side switches; bypassed with ≥1µF ceramic capacitor to SGND |
| 14 (VL) | Internal 5.2V LDO output | Powers low-side drivers (DL1/DL2) and gate-drive circuitry; regulated from V+, stable over temperature |
| 28 (DL1), 30 (DL2) | Synchronous rectifier gate drivers | Drive external low-side n-MOSFETs for Ch1/Ch2; support 100% duty-cycle operation with break-before-make timing |
| 26, 31 (BST1/VDD1, BST2/VDD2) | Bootstrap capacitor connections | Enable high-side gate drive above V+; require 0.1µF ceramic + Schottky diode per channel |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck architecture | Two independent channels with integrated high-side MOSFETs (RON1 = 208mΩ typ, RON2 = 300mΩ typ) and external low-side drivers |
| 80V load-dump transient immunity | Integrated charge-pump-based gate driver (GATE pin) controls external n-MOSFET to clamp IN_HIGH during ISO 7637-2 Pulse 5a events |
| Out-of-phase 180° operation | FSEL_1 = VL configures converters to switch 180° apart, halving input ripple current and reducing bulk capacitance requirements |
| Voltage-mode control with external compensation | COMP1/COMP2 pins allow full loop gain and phase margin optimization for diverse output capacitors and load dynamics |
| Automotive-grade thermal and reliability design | Rated for –40°C to +125°C; 2.7W power dissipation capability at +70°C; exposed pad improves thermal resistance (θJC = 1.7°C/W) |
Applications
| Automotive AM/FM Radio Power Supply | Automotive Instrument Cluster Display |
|---|---|
Use Scenario: Powers analog RF front-end and digital DSP core in vehicle infotainment head units under varying battery conditions (cold crank, alternator load dump). IC Role / Device Role / Timing Role: Dual-output buck regulator providing isolated 5V (RF section) and 3.3V (DSP/microcontroller) rails with synchronized switching to minimize conducted EMI in sensitive RF bands. Use Value: 2.2MHz max switching frequency ensures operation outside AM band (530–1710kHz); 80V load-dump protection eliminates need for external TVS on IN_HIGH rail. | Use Scenario: Supplies backlight LED drivers and TFT-LCD controller in digital instrument clusters exposed to under-hood thermal cycling and electrical transients. IC Role / Device Role / Timing Role: Primary DC-DC power management IC delivering stable 5V and 3.3V outputs with PGOOD sequencing to ensure safe boot order of display subsystems. Use Value: –40°C to +125°C operation and thermal shutdown (+165°C) guarantee reliability in sealed, non-ventilated dash environments; soft-start prevents inrush into large display capacitance. |
| Automotive Telematics Control Unit (TCU) | ADAS Camera Module Power |
Use Scenario: Provides clean, sequenced power to cellular modem, GNSS receiver, and microcontroller in vehicle-to-everything (V2X) communication modules. IC Role / Device Role / Timing Role: Dual-channel regulator with independent EN1/EN2 and PGOOD1/PGOOD2 enables controlled power-up of modem before GNSS and MCU, meeting functional safety startup timing constraints. Use Value: 7µA standby current (ON/OFF = low) extends battery life during vehicle sleep mode; SYNC input allows alignment with system clock for deterministic EMI profile. | Use Scenario: Powers image sensor, ISP, and serializer in rear-view or surround-view camera modules mounted near bumpers or wheel wells. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering 1.2V (sensor core) and 2.8V (analog front-end) with fast transient response to handle dynamic exposure changes. Use Value: Voltage-mode control with external compensation ensures stability with low-ESR ceramic output caps; 180° out-of-phase operation minimizes input ripple affecting noise-sensitive analog video signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQDPRRQ1 | Single-channel, 65V-input, 3.5A buck controller with external MOSFETs; no integrated high-side FETs or load-dump protection | Requires external high-side/low-side FETs and separate OVP circuit for load-dump; better suited for higher-current (>2A) single-rail designs | Select when higher output current or wider input range (up to 65V) is needed, and board space allows discrete FET layout |
| TPS65321A-Q1 | Dual-channel, 36V-input, integrated 2.5A/1.5A buck with built-in watchdog and reset logic; no load-dump protection or GATE driver | Lacks 80V transient handling; includes safety-monitoring features for ASIL-B systems but requires external TVS for ISO 7637-2 compliance | Prefer for safety-critical applications requiring built-in diagnostics, where load-dump protection is added externally |
Compared with LM5143AQDPRRQ1 and TPS65321A-Q1, the MAX5099ATJ+ uniquely integrates both high-side MOSFETs and a dedicated load-dump gate driver, eliminating four external FETs and associated gate-drive components while delivering certified 80V transient immunity - reducing BOM count and layout complexity for dual-rail automotive infotainment and cluster supplies.
Availability
The MAX5099ATJ+ is available at Aetrix Electronics and suitable for automotive infotainment, instrument cluster, and telematics applications requiring stable component supply, AEC-Q100-compliant operation, and long-term lifecycle availability.
Supply support for MAX5099ATJ+ 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 automotive, industrial, and communications markets.
The MAX5099ATJ+ belongs to Maxim's automotive power management product line, engineered specifically for robust DC-DC conversion in harsh vehicle environments - emphasizing load-dump resilience, wide temperature operation, and EMI-conscious switching architecture.
FAQ
What is the maximum input voltage the MAX5099ATJ+ can withstand during a load-dump event?
The MAX5099ATJ+ itself does not directly withstand 80V on its V+ pin. Instead, it protects the IN_HIGH rail using an internal clamp that limits voltage to ≤21V (max), while the external n-channel MOSFET - driven by the GATE pin - absorbs the full 80V transient energy. This architecture allows the MAX5099ATJ+ to safely manage ISO 7637-2 Pulse 5a events without damage to downstream 5V/3.3V circuitry.
Does the MAX5099ATJ+ support independent enable and power-good signaling for each channel?
Yes, the MAX5099ATJ+ provides fully independent control and monitoring per channel: EN1 and EN2 are active-high enable inputs, while PGOOD1 and PGOOD2 are open-drain outputs asserting low when their respective output falls below 92.5% of the setpoint. This enables precise power sequencing - for example, using PGOOD1 to enable EN2 - which is critical in automotive systems with strict boot-order requirements.
Can the MAX5099ATJ+ operate with only one channel enabled while the other is disabled?
Yes, the MAX5099ATJ+ supports independent channel operation. Driving EN1 = low disables Converter 1 (including its high-side FET and DL1 driver), while Converter 2 remains fully functional if EN2 = high. Both PGOOD outputs reflect only their respective channel status, and the internal VL regulator continues supplying bias to active circuitry. No cross-channel interference occurs in this configuration.
What is the purpose of the FSEL_1 pin on the MAX5099ATJ+ and how does it affect switching behavior?
The FSEL_1 pin selects the relative switching frequency relationship between Converter 1 and Converter 2. When FSEL_1 = VL, both channels operate at the same frequency and 180° out-of-phase - minimizing input ripple. When FSEL_1 = SGND, Converter 1 runs at half the frequency of Converter 2 (i.e., fSW1 = fSW2/2), useful for optimizing efficiency vs. EMI trade-offs in multi-rail systems. Leaving FSEL_1 unconnected is not allowed.
How does the MAX5099ATJ+ achieve 80V load-dump protection without internal high-voltage transistors?
The MAX5099ATJ+ achieves 80V load-dump protection through a hybrid approach: its IN_HIGH pin is internally clamped to ≤21V, while the GATE pin drives the gate of an external n-channel MOSFET connected in series with the battery feed. During a load-dump event, the MAX5099ATJ+'s internal charge pump boosts GATE voltage to maintain the external FET in linear mode, dissipating the transient energy across the FET rather than the IC. This preserves the MAX5099ATJ+'s 19V absolute maximum rating while enabling 80V system-level immunity.
MAX5099ATJ+ 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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 19V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 17.1V
- Current - Output:
- 1A, 2A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFN (5x5)
MAX5099ATJ+ FAQ
1.How can I place an order for MAX5099ATJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5099ATJ+ 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 MAX5099ATJ+ reliable?
The price and inventory of MAX5099ATJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5099ATJ+ is usually 5 days.
3.What payment methods are accepted for MAX5099ATJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5099ATJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5099ATJ+?
MAX5099ATJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5099ATJ+ 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 MAX5099ATJ+?
For technical support, including MAX5099ATJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5099ATJ+ requirements.
6.How does Aetrix verify that MAX5099ATJ+ is sourced from the original manufacturer or authorized distributors?
All MAX5099ATJ+ 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 MAX5099ATJ+ meets industry standards.
7.What is the process for return or replacement of MAX5099ATJ+?
All MAX5099ATJ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5099ATJ+, 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 MAX5099ATJ+ part is unused and in its original packaging.
Return procedure for MAX5099ATJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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