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Analog Devices Inc./Maxim Integrated MAX5099ATJ+T
- Part No.:
- MAX5099ATJ+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX5099ATJ+T.pdf
- Description:
- IC REG BUCK ADJ 1A/2A DL 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,132
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Product details
Overview
The MAX5099ATJ+T 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, operates from 4.5V–19V input, and features voltage-mode control with external compensation for stable transient response in harsh automotive environments.
For engineers reviewing the MAX5099ATJ+T datasheet, MAX5099ATJ+T pinout, MAX5099ATJ+T application, or MAX5099ATJ+T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive thermal and protection specs, and real-world design implications for instrument cluster and AM/FM radio power supplies.
Technical Context
The MAX5099ATJ+T implements two independent voltage-mode PWM controllers with internal transconductance error amplifiers (COMP1/COMP2), adjustable 200kHz–2.2MHz switching via ROSC or SYNC input, and 180° out-of-phase operation to reduce input ripple. Each channel integrates a high-side n-channel MOSFET (RON1 = 195mΩ typ, RON2 = 280mΩ typ) and drives an external synchronous rectifier via DL1/DL2 gate drivers.
Its load-dump protection uses an internal charge pump to drive an external n-channel MOSFET via GATE output, clamping IN_HIGH to ≤21V during transients up to 80V. The device includes digital soft-start (2048 clock cycles), individual EN1/EN2 enables, open-drain PGOOD1/PGOOD2 outputs, and thermal shutdown at +165°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 19V - supports wide automotive battery range including cold-crank (4.5V) and load-dump surges (up to 80V protected) |
| Output Current (Ch1 / Ch2) | Up to 2A / 1A - sufficient for powering microcontrollers and display backlights in instrument clusters |
| Switching Frequency | 200kHz to 2.2MHz - programmable via ROSC or SYNC; enables AM-band avoidance and compact magnetics |
| Load-Dump Protection | Handles 80V transients - internal charge pump drives external n-MOSFET to absorb energy without external TVS |
| Thermal Range | -40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress requirements |
| Efficiency (Typ) | 85% at 1.5A/5V & 0.75A/3.3V - measured at 300kHz, enabling low heat dissipation in thermally constrained TQFN-EP package |
| Max Duty Cycle | 92.5% - supports high step-down ratios (e.g., 16V→3.3V) while maintaining regulation during low-input conditions |
Pinout & Package
MAX5099ATJ+T is housed in a thermally enhanced 32-pin TQFN-EP (5mm × 5mm) with exposed pad (EP) connected to SGND for optimal heat dissipation (θJC = 1.7°C/W). The package supports up to 2.7W power dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SOURCE1, SOURCE2 (Pins 24–25, 1–32) | Internal MOSFET source terminals | Connected to switched node of buck inductors; must be routed with low-inductance paths to minimize switching noise |
| DRAIN1, DRAIN2 (Pins 22–23, 2–3) | Internal MOSFET drain terminals | Connect to input rail (buck mode); require Kelvin sensing if used in high-accuracy current limiting |
| DL1, DL2 (Pins 28, 30) | Low-side synchronous rectifier gate drivers | Drive external n-channel MOSFETs for efficiency improvement; support break-before-make timing (50ns) |
| GATE (Pin 10) | Load-dump protection MOSFET gate driver | Outputs IN_HIGH + 9V (typ) to fully enhance external n-MOSFET during 80V transients |
| FB1, FB2 (Pins 19, 6) | Voltage feedback inputs | Set output voltage via resistive divider; reference accuracy ±0.8% over -40°C to +125°C ensures tight regulation |
| EN1, EN2 (Pins 20, 5) | Independent enable inputs | Active-high logic; allow precise power sequencing between rails (e.g., 5V before 3.3V) |
| PGOOD1, PGOOD2 (Pins 21, 4) | Open-drain power-good indicators | Assert low when output drops below 92.5% VFB; used for system reset or downstream enable chaining |
| SYNC (Pin 9) | External clock synchronization input | Accepts 400kHz–4400kHz square wave; sets both channels to half that frequency for EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80V load-dump protection | Eliminates need for external TVS diodes or discrete clamp circuits in automotive front-end designs |
| Dual independent voltage-mode controllers | Enables separate loop compensation per channel for optimized transient response across varying loads |
| 2048-cycle digital soft-start | Prevents inrush current and output overshoot during startup, critical for sensitive analog subsystems |
| Thermally enhanced 32-pin TQFN-EP | Delivers 2.7W power handling at +70°C with θJA = 29.0°C/W - suitable for dense automotive PCB layouts |
| Individual PGOOD and EN signals | Supports robust power sequencing in multi-rail systems such as infotainment head units and ADAS modules |
| Adjustable 200kHz–2.2MHz switching | Allows trade-off between size (higher fSW → smaller inductors/caps) and efficiency (lower fSW → lower switching loss) |
Applications
| Automotive Instrument Cluster Display | Automotive AM/FM Radio Power Supply |
|---|---|
Use Scenario: Powering LCD backlight drivers, microcontroller, and CAN transceiver in digital dashboards exposed to engine bay temperatures and load-dump events. IC Role / Device Role / Timing Role: Dual-buck regulator providing isolated 5V (MCU/core) and 3.3V (peripherals) rails with synchronized switching to suppress conducted EMI. Use Value: Integrated 80V load-dump protection eliminates external clamp components; 125°C operation ensures reliability behind dashboard glass. |
Use Scenario: Generating clean, low-noise 5V and 3.3V supplies for RF front-end, DSP, and audio codecs in vehicle-mounted radios. IC Role / Device Role / Timing Role: Synchronous buck controller delivering tightly regulated outputs with <±1% line/load regulation and 200kHz–2.2MHz programmability to avoid AM band interference. Use Value: 180° out-of-phase operation reduces input capacitor RMS current by ~30%, lowering required capacitance and board area. |
| Automotive Telematics Control Unit (TCU) | Automotive Head-Up Display (HUD) Power Management |
Use Scenario: Powering LTE modem, GNSS receiver, and secure MCU in cellular-connected vehicle modules subject to ISO 7637-2 pulse 5a/b transients. IC Role / Device Role / Timing Role: Primary DC-DC stage converting 12V battery to 5V/3.3V with hiccup-mode short-circuit protection and thermal shutdown. Use Value: Internal 2.8A/1.75A current limits prevent latch-up during antenna cable shorts; ON/OFF pin enables ultra-low 7µA standby current. |
Use Scenario: Supplying precision analog circuitry (laser drivers, image sensors) and FPGA in HUD systems requiring low output ripple and fast transient recovery. IC Role / Device Role / Timing Role: Dual-channel buck converter with external compensation (COMP1/COMP2) enabling custom loop bandwidth tuning for <10µs load-step response. Use Value: Voltage-mode control with 0.8V FB reference allows accurate scaling down to 0.8V outputs using BYPASS-referenced dividers. |
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 |
|---|---|---|---|
| LM5143AQRHBTQ1 | Single-channel, 65V max input; no integrated load-dump protection; requires external MOSFET drivers | Lacks dual-output capability and 80V transient handling - needs additional protection circuitry for same automotive use cases | Choose when higher input voltage (>19V) or higher current (>2A) per channel is needed, but accept added BOM complexity |
| TPS54560QDGQRQ1 | Single-channel, 60V input; no load-dump protection; fixed 500kHz switching; no SYNC input | Cannot replace dual-rail functionality without adding second IC; lacks programmable frequency and sequencing control | Select only for cost-sensitive single-rail applications where 80V protection and dual outputs are not required |
Compared with LM5143AQRHBTQ1 and TPS54560QDGQRQ1, the MAX5099ATJ+T uniquely integrates dual synchronous buck regulation, 80V load-dump protection, and full sequencing control in one AEC-Q100-qualified package - reducing component count and layout risk in safety-critical automotive power domains.
Availability
MAX5099ATJ+T is available at Aetrix Electronics and suitable for automotive instrument clusters, AM/FM radio power supplies, telematics control units, and head-up display systems requiring stable component supply across extended temperature and transient-voltage conditions.
Supply support for MAX5099ATJ+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX5099 product line was designed specifically for automotive power conversion applications demanding robustness against load-dump transients, wide input range operation, and dual-rail flexibility - targeting infotainment, instrumentation, and ADAS subsystems.
FAQ
What is the maximum input voltage the MAX5099ATJ+T can withstand during load-dump events?
The MAX5099ATJ+T incorporates integrated load-dump protection capable of handling transients up to 80V on the IN_HIGH pin. This is achieved via an internal charge pump driving an external n-channel MOSFET through the GATE pin. During such events, the IN_HIGH clamp voltage remains ≤21V (max), protecting downstream circuitry without requiring external TVS diodes. The MAX5099ATJ+T itself operates continuously from 4.5V to 19V nominal input.
Does the MAX5099ATJ+T support independent enable and power-good signaling for each output channel?
Yes, the MAX5099ATJ+T provides dedicated EN1 and EN2 pins for independent activation of Converter 1 and Converter 2, along with open-drain PGOOD1 and PGOOD2 outputs that assert low when their respective output falls below 92.5% of the programmed regulation voltage. This enables precise power sequencing - for example, using PGOOD1 to enable EN2 ensures 5V rail stability before enabling the 3.3V rail. The MAX5099ATJ+T datasheet confirms these signals operate across the full -40°C to +125°C automotive temperature range.
How is the switching frequency set on the MAX5099ATJ+T, and what is its operational range?
The MAX5099ATJ+T supports two frequency-setting methods: resistor-based (ROSC connected from OSC to SGND) or external clock synchronization (via SYNC pin). With ROSC, switching frequency ranges from 200kHz to 2.2MHz; typical values include 1.7–2.1MHz with 6.81kΩ. When using SYNC, the device accepts 400kHz–4400kHz inputs, and each converter runs at half that frequency. The MAX5099ATJ+T maintains ±5% accuracy across temperature and input voltage, as verified in Electrical Characteristics Table on page 4 of the datasheet.
What thermal performance can be expected from the MAX5099ATJ+T in a standard PCB layout?
In a standard 4-layer PCB with 2oz copper and 1cm² exposed thermal pad connected to SGND, the MAX5099ATJ+T achieves θJA = 29.0°C/W and θJC = 1.7°C/W. At +70°C ambient, it safely dissipates up to 2.7W - sufficient for 2A/5V and 1A/3.3V operation at 85% efficiency. Derating begins above +70°C at 34.5mW/°C. The exposed pad (EP) must be soldered to SGND and tied to a large copper pour for optimal performance. These values are measured per JEDEC JESD51 standards and documented in the Absolute Maximum Ratings table.
Can the MAX5099ATJ+T be used in boost configuration, and what pins are involved?
Yes, the MAX5099ATJ+T supports boost topology per the Pin Description section: DRAIN1/DRAIN2 serve as low-side switches, SOURCE1/SOURCE2 connect to PGND, and BST1/VDD1/BST2/VDD2 function as driver bypass capacitors. However, the internal high-side MOSFETs remain unused in boost mode, and external Schottky diodes or synchronous MOSFETs are required. The MAX5099ATJ+T datasheet explicitly shows Figure 5 for boost operation and specifies peak source/drain currents (5A/3A for 1ms) applicable in both topologies. Output voltage is still regulated via FB1/FB2 feedback.
MAX5099ATJ+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX5099ATJ+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5099ATJ+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 MAX5099ATJ+T reliable?
The price and inventory of MAX5099ATJ+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5099ATJ+T is usually 5 days.
3.What payment methods are accepted for MAX5099ATJ+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5099ATJ+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5099ATJ+T?
MAX5099ATJ+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5099ATJ+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 MAX5099ATJ+T?
For technical support, including MAX5099ATJ+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5099ATJ+T requirements.
6.How does Aetrix verify that MAX5099ATJ+T is sourced from the original manufacturer or authorized distributors?
All MAX5099ATJ+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 MAX5099ATJ+T meets industry standards.
7.What is the process for return or replacement of MAX5099ATJ+T?
All MAX5099ATJ+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5099ATJ+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 MAX5099ATJ+T part is unused and in its original packaging.
Return procedure for MAX5099ATJ+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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