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Analog Devices Inc./Maxim Integrated MAX20040ATPA/VY+T
- Part No.:
- MAX20040ATPA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20040ATPA/VY+T.pdf
- Description:
- IC REG BUCK BST PROG 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,441
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Product details
Overview
MAX20040ATPA/VY+T from Analog Devices is an automotive-grade synchronous buck-boost DC-DC converter with integrated H-bridge MOSFETs, delivering up to 1.2A output current across a 2V–36V input range while consuming only 52μA quiescent current in standby mode. It features ±2% output voltage accuracy, 2.2MHz maximum switching frequency, and AEC-Q100 qualification for infotainment power rails and start-stop systems.
For engineers reviewing the MAX20040ATPA/VY+T datasheet, MAX20040ATPA/VY+T pinout, MAX20040ATPA/VY+T application, or MAX20040ATPA/VY+T equivalent, key selection considerations include its 20-pin SWTQFN package, programmable 4V–15V output (or fixed 5V), spread-spectrum EMI reduction, PGOOD monitoring, and cold-crank operation down to 2V after startup.
Technical Context
The MAX20040ATPA/VY+T implements a current-mode controlled buck-boost topology with integrated high-side and low-side DMOS FETs forming an H-bridge architecture, enabling seamless transition between buck and boost modes without external control logic. Its internal 4.6V LDO (VCC) powers control circuitry and enables operation down to 2V input once startup is complete.
It supports resistor-programmable switching frequency from 200kHz to 2.2MHz via the FSW pin, external clock synchronization via FSYNC, and selectable light-load operation modes-skip mode (with 52μA IQ) or forced PWM-controlled by logic-level inputs. Protection includes cycle-by-cycle current limiting, thermal shutdown at 166°C, overvoltage protection (108% VOUT), and hiccup-mode short-circuit recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 36V after startup; supports cold-crank conditions and 40V load-dump transients. |
| Output Current | Up to 1.2A continuous; enables PoL supply for automotive ECUs and display modules. |
| Switching Frequency | Programmable 200kHz–2.2MHz; allows compact magnetics and avoids AM band interference. |
| Quiescent Current | 52μA in standby (B/D variants); meets OEM requirements for always-on vehicle subsystems. |
| Output Accuracy | ±2% over temperature and line/load; ensures stable 5V or adjustable 4V–15V rail for sensitive analog/digital loads. |
| Package | 20-pin SWTQFN (4mm × 4mm); side-wettable leads support automated optical inspection (AOI) in automotive PCB assembly. |
| Temperature Range | −40°C to +125°C ambient; qualified per AEC-Q100 Grade 1 for under-hood and cabin applications. |
Pinout & Package
MAX20040ATPA/VY+T is housed in a 20-pin, 4mm × 4mm side-wettable TQFN (SWTQFN) package with exposed thermal pad (EP). The package supports high-power density and reliable reflow soldering in automotive production environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND2 | Ground reference for boost low-side FETs | Separate ground path minimizes noise coupling into boost-stage current sensing. |
| 2 LX1 | IN-to-PGND switching node | Connects to buck high-side and boost low-side MOSFET drains; requires low-inductance layout. |
| 3 BST1 | Bootstrap capacitor terminal for LX1 high-side driver | Requires 100nF ceramic cap between BST1 and LX1 to sustain gate drive during high-duty cycles. |
| 4 VCC | Internal LDO output (4.6V) | Powers internal logic; bypass with 2.2μF ceramic cap to AGND for stability and noise rejection. |
| 5 AGND1 | Analog ground reference | Must be connected to clean analog ground plane; isolated from power grounds to reduce noise. |
| 6 COMP | External compensation node | Interface for Type II compensation network (RC, CC, CF) to stabilize current-mode loop. |
| 7 SPS | Spread-spectrum enable/disable | Pull high to activate ±3% frequency modulation; reduces peak EMI emissions without filtering. |
| 8 PGOOD | Open-drain power-good indicator | Asserts when VOUT ≥96% of regulation; used for system sequencing and fault detection. |
| 9 FSW | Frequency-setting oscillator pin | Resistor to AGND sets fSW (e.g., 12kΩ → 2.2MHz); enables precise EMI tuning. |
| 10 FB | Feedback voltage input | Connect to VCC for fixed 5V; use resistive divider for 4V–15V adjustment (VFB = 1.25V). |
| 11 FSYNC | Mode select / external sync input | AGND = skip mode; VCC = forced PWM; external clock ≤10% below fSW enables sync. |
| 12 AGND2 | Secondary analog ground | Provides dedicated return for feedback and compensation paths; ties to AGND1 at single point. |
| 13 IN | Main input supply (3.5V–36V) | Bypass with ≥4.7μF ceramic cap to PGND; powers internal bias and H-bridge FETs. |
| 14 PGND1 | Ground reference for buck low-side FETs | Separate return for buck-stage conduction losses; improves current-sense accuracy. |
| 15 OUT | Regulated output voltage | Delivers up to 1.2A; connects to output capacitor and load; senses via OUT_S for remote sensing. |
| 16 OUT_S | Remote output voltage sense | Enables Kelvin connection to improve regulation accuracy under PCB trace resistance. |
| 17 EN | High-voltage enable input (3.3V–40V compatible) | Logic-high enables operation; withstands 40V transients; no external level-shifting needed. |
| 18 N.C. | No connection | Not internally bonded; leave unconnected and unpopulated on PCB. |
| 19 LX2 | OUT-to-PGND switching node | Connects to boost high-side and buck low-side MOSFET drains; critical for layout symmetry. |
| 20 BST2 | Bootstrap capacitor terminal for LX2 high-side driver | Requires 100nF ceramic cap between BST2 and LX2; identical function to BST1. |
Key Features
| Feature | Design Value |
|---|---|
| H-bridge integration | Eliminates four external MOSFETs and associated gate drivers, reducing BOM count and board area by >30%. |
| Cold-crank operation | Functions at VIN = 2V after startup, supporting engine cranking where battery dips below 6V. |
| Spread-spectrum modulation | Reduces peak radiated EMI by spreading energy across ±3% bandwidth, easing EMC compliance testing. |
| Programmable light-load mode | Selectable skip or forced-PWM via FSYNC pin-enables optimization of efficiency vs. EMI/noise trade-offs. |
| Robust protection suite | Includes cycle-by-cycle current limit, thermal shutdown with 18°C hysteresis, OVP, and hiccup-mode short-circuit recovery. |
Applications
| Infotainment Systems | Body Electronics |
|---|---|
Use Scenario: Powering LCD displays, audio amplifiers, and USB-C PD controllers in automotive head units. IC Role / Device Role / Timing Role: Primary buck-boost PoL regulator delivering stable 5V/12V from battery rail with transient immunity. Use Value: Maintains regulated output during 40V load-dump events and 2V cold-crank dips, preventing system resets. | Use Scenario: Supplying door module ECUs, seat control units, and mirror actuators requiring 5V or 12V rails. IC Role / Device Role / Timing Role: Compact, high-efficiency DC-DC converter replacing discrete buck-boost solutions in space-constrained modules. Use Value: 52μA standby current extends battery life in always-on modules; AEC-Q100 ensures long-term reliability. |
| Start-Stop Systems | Power over Coax (PoC) |
Use Scenario: Providing auxiliary 5V power to camera modules and radar sensors during engine-off battery-only operation. IC Role / Device Role / Timing Role: High-input-range buck-boost regulator maintaining stable output as battery voltage drops to 2V during cranking. Use Value: Enables uninterrupted camera feed and sensor operation during engine restart; eliminates need for backup capacitors. | Use Scenario: Generating regulated 12V/15V from coaxial cable-fed power in ADAS camera links. IC Role / Device Role / Timing Role: Isolated PoL converter accepting wide-input PoC-derived rail and rejecting common-mode noise. Use Value: Integrated H-bridge handles bidirectional power flow; spread spectrum suppresses EMI coupling into video signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20039ATPA/VY+T | 0.6A max output current; same pinout, package, and feature set except lower current rating and no 52μA standby mode. | Suitable for lower-power body control modules where <600mA load is sufficient. | Select when cost sensitivity outweighs current headroom needs; not drop-in for 1.2A designs. |
| LM5175RHFTR | 4-switch buck-boost controller (external FETs); 5A capability; no integrated LDO or PGOOD; wider 3.5V–65V input. | Used in higher-power ADAS domain controllers requiring >2A and flexible external FET selection. | Choose when scalability, thermal management, or higher current is required; adds complexity and BOM cost. |
Compared with MAX20039ATPA/VY+T and LM5175RHFTR, the MAX20040ATPA/VY+T uniquely balances automotive qualification, integrated H-bridge simplicity, 1.2A capability, and ultra-low 52μA standby-making it optimal for mid-power infotainment and body electronics where space, reliability, and OEM current budgets are critical.
Availability
MAX20040ATPA/VY+T is available at Aetrix Electronics and suitable for automotive infotainment systems, start-stop power supplies, and body electronics requiring stable component supply with full AEC-Q100 traceability and extended temperature support.
Supply support for MAX20040ATPA/VY+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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX20040ATPA/VY+T belongs to the MAX20039/MAX20040 family of automotive buck-boost converters, designed specifically to replace discrete power stages in demanding vehicle subsystems requiring cold-crank resilience, low IQ, and EMI robustness.
FAQ
What is the minimum input voltage supported by the MAX20040ATPA/VY+T during normal operation?
The MAX20040ATPA/VY+T operates from 2V to 36V after initial startup is complete-enabled by its internal VCC LDO powered from the OUT pin. Startup requires VIN ≥ 3.5V and VCC UVLO release (≥3.5V), but once running, it sustains regulation down to 2V, making it ideal for automotive cold-crank scenarios where battery voltage collapses temporarily. This behavior is confirmed in the Recommended Operating Conditions table and Detailed Description section of the datasheet.
Does the MAX20040ATPA/VY+T support remote output voltage sensing?
Yes, the MAX20040ATPA/VY+T supports remote sensing via the OUT_S pin (Pin 16), which provides Kelvin connection capability to compensate for PCB trace resistance between the IC's OUT pin and the actual load. When enabled, this improves output voltage regulation accuracy under varying load currents and board layout conditions-critical for precision-powered automotive sensors and displays.
Can the MAX20040ATPA/VY+T be synchronized to an external clock source?
Yes, the MAX20040ATPA/VY+T accepts external clock synchronization via the FSYNC pin (Pin 11). An external clock signal within −10% of the nominal internal switching frequency (set by RFSW on FSW) can be applied to force fixed-frequency PWM operation. The device locks to the external clock within two cycles and resumes internal oscillation if the external signal is absent for more than two cycles-ensuring deterministic timing in multi-rail systems.
What protection features are built into the MAX20040ATPA/VY+T?
The MAX20040ATPA/VY+T integrates multiple hardware-based protections: cycle-by-cycle current limiting, thermal shutdown at 166°C with 18°C hysteresis, output overvoltage protection (108% VOUT), input undervoltage lockout (UVLO), and hiccup-mode short-circuit recovery with 26ms autoretry. These features operate autonomously without firmware intervention, ensuring fail-safe behavior in harsh automotive environments.
Is the MAX20040ATPA/VY+T pin-compatible with the MAX20039ATPA/VY+T?
Yes, the MAX20040ATPA/VY+T is fully pin-compatible with the MAX20039ATPA/VY+T-including identical 20-pin SWTQFN package, pin functions, and footprint. Both share the same EN, FSYNC, SPS, PGOOD, and FB interface logic. However, the MAX20040ATPA/VY+T delivers 1.2A versus 0.6A and includes 52μA standby current (B/D variants), so direct substitution requires verification of load current and quiescent budget requirements.
MAX20040ATPA/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Programmable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 15V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-TQFN-EP (4x4)
MAX20040ATPA/VY+T FAQ
1.How can I place an order for MAX20040ATPA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20040ATPA/VY+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 MAX20040ATPA/VY+T reliable?
The price and inventory of MAX20040ATPA/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20040ATPA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20040ATPA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20040ATPA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20040ATPA/VY+T?
MAX20040ATPA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20040ATPA/VY+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 MAX20040ATPA/VY+T?
For technical support, including MAX20040ATPA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20040ATPA/VY+T requirements.
6.How does Aetrix verify that MAX20040ATPA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20040ATPA/VY+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 MAX20040ATPA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20040ATPA/VY+T?
All MAX20040ATPA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20040ATPA/VY+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 MAX20040ATPA/VY+T part is unused and in its original packaging.
Return procedure for MAX20040ATPA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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