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Analog Devices Inc./Maxim Integrated MAX16903SATB50/V+T
- Part No.:
- MAX16903SATB50/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX16903SATB50/V+T.pdf
- Description:
- IC REG BUCK 5V 1A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,169
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Product details
Overview
MAX16903SATB50/V+T from Maxim Integrated is a synchronous buck DC-DC converter IC designed for automotive power supply rails. It delivers 1A output at fixed 5.0V with input voltage range +3.5V to +28V, 25μA quiescent current in skip mode, 2.1MHz switching frequency, and AEC-Q100 qualification for under-hood applications including engine control units and ADAS camera modules.
For engineers reviewing the MAX16903SATB50/V+T datasheet, MAX16903SATB50/V+T pinout, MAX16903SATB50/V+T application, or MAX16903SATB50/V+T equivalent, key selection criteria include its spread-spectrum EMI reduction, -40°C to +125°C operation, 97% dropout duty cycle, integrated high/low-side FETs, and compatibility with cold-crank transients up to +42V.
Technical Context
The MAX16903SATB50/V+T uses current-mode control with internal soft-start (8ms typical) and no external compensation required. Its oscillator supports three modes: forced PWM (fixed 2.1MHz), skip mode (25μA IQ), and external synchronization (1.8–2.6MHz).
It integrates high-side (400–800mΩ RDS(ON)) and low-side (250–450mΩ RDS(ON)) DMOS switches, features PGOOD monitoring with 88–98% threshold hysteresis, and implements thermal shutdown at 175°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3.5V to +28V; supports automotive cold-crank down to 3.5V and tolerates +42V transients for robustness. |
| Output Voltage | Fixed 5.0V ±2.5% over full load/temperature; enables direct replacement of linear regulators in 5V rail systems. |
| Max Output Current | 1A continuous; peak current limit 1.275–1.75A ensures safe operation during short-duration load surges. |
| Quiescent Current | 25μA typical in skip mode; meets OEM standby current budgets for always-on vehicle subsystems. |
| Switching Frequency | 2.1MHz typical; allows use of compact 4.7µH inductors and reduces EMI below AM band (1.8MHz). |
| Package | 10-pin TDFN-EP (3mm × 3mm); thermally enhanced exposed pad improves power dissipation in confined automotive layouts. |
| Temperature Range | -40°C to +125°C; qualified per AEC-Q100 Grade 0 for under-hood deployment without derating. |
| EMI Reduction | Spread-spectrum modulation (+6% range); lowers peak radiated emissions without requiring external filters. |
Pinout & Package
MAX16903SATB50/V+T is housed in a thermally enhanced 10-pin TDFN-EP package (3mm × 3mm × 0.75mm) with exposed pad connected to PGND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor node | Drives high-side FET gate; requires 0.1µF ceramic capacitor between BST and LX for proper gate charge replenishment. |
| SUP | Main input supply input | Accepts +3.5V to +28V; must be decoupled with 4.7µF ceramic capacitor placed adjacent to pin for high-frequency noise suppression. |
| LX | Switching node | Connects to inductor; high-impedance when off; requires low-inductance layout to minimize ringing and EMI. |
| PGND | Power ground return | Carries high pulsed currents; must be tied directly to exposed pad and output capacitor negative terminal to reduce ground bounce. |
| OUTS | Voltage feedback sense | Monitors regulated output; bypassed with ≥10µF X7R ceramic capacitor to PGND for stability and transient response. |
| PGOOD | Open-drain power-good indicator | Signals valid regulation (≥93% VOUT); requires external 20kΩ pull-up to BIAS or system rail for status monitoring. |
| SYNC | Mode control and sync input | Grounded = skip mode; driven by BIAS or external clock = forced PWM; enables dynamic efficiency optimization. |
| BIAS | Internal 5V logic supply | Provides bias for internal circuitry; requires 2.2µF ceramic capacitor to GND for noise immunity and startup reliability. |
| GND | Analog ground reference | Separate from PGND; connects to system analog ground plane; must tie to PGND only at single point near output capacitor. |
| EN | Enable input | High-voltage compatible (up to +42V); active-high logic; no internal pullup/pulldown to preserve ultra-low IQ. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high/low-side FETs | Eliminates need for external MOSFETs and drivers, reducing BOM count and PCB area by >30% versus discrete solutions. |
| Spread-spectrum modulation | Reduces peak radiated EMI by spreading energy across 6% bandwidth, easing compliance with CISPR 25 Class 5 limits. |
| 97% dropout duty cycle | Enables regulation during deep battery sag (e.g., <6V input), critical for engine start-stop and cold-crank scenarios. |
| Three SYNC-controlled operating modes | Allows real-time trade-off between light-load efficiency (skip mode), EMI control (forced PWM), and system-level timing alignment (sync mode). |
| AEC-Q100 Grade 0 qualification | Validated for automotive under-hood environments, including temperature cycling, mechanical shock, and humidity testing. |
| Ultra-low 25μA quiescent current | Meets stringent OEM requirements for always-on domains (e.g., telematics, body control modules) without compromising wake-up latency. |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Power Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in gasoline/diesel engine management systems exposed to wide battery voltage swings and thermal stress. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering stable rail during cold-crank (3.5V) and load-dump (+42V) events. Use Value: Maintains regulation at 97% duty cycle during cranking; spread-spectrum EMI reduction avoids interference with crankshaft position sensors and knock detection circuits. | Use Scenario: Supplies image sensor and ISP in forward-facing driver assistance cameras mounted behind windshield. IC Role / Device Role / Timing Role: High-efficiency 5V source with fast transient response to handle burst-mode sensor readouts and video streaming loads. Use Value: 2.1MHz switching enables small 4.7µH inductor and low-profile layout; PGOOD signal synchronizes sensor initialization sequence with power rail stability. |
| Infotainment System Core Logic Rail | Automotive Gateway Module Power |
Use Scenario: Generates 5V core supply for SoC, audio codec, and display controller in head-unit systems with multiple sleep/wake states. IC Role / Device Role / Timing Role: Always-on buck converter supporting ultra-low-power standby mode (<25μA) while maintaining fast wake-up capability. Use Value: Skip-to-standby transition at <5mA load extends battery life in parked vehicle mode without sacrificing restart responsiveness. | Use Scenario: Provides isolated 5V rail for CAN FD, Ethernet AVB, and LIN communication controllers in domain-centralized gateways. IC Role / Device Role / Timing Role: Synchronized buck regulator enabling deterministic timing across multi-protocol interfaces via SYNC pin. Use Value: External clock synchronization eliminates beat frequencies between power and data clocks, reducing jitter on high-speed serial links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRTWRQ1 | 4.5–36V input, 1A, 2.1MHz, no spread-spectrum, 35μA IQ in FPWM mode | Lacks spread-spectrum EMI reduction; higher IQ in forced-PWM mode impacts standby power budget | Preferred where cost sensitivity outweighs EMI requirements and thermal margin permits larger package |
| TPS62903-Q1 | 3–18V input, 3A, 1.8–4MHz programmable, 15μA IQ, no AEC-Q100 Grade 0 rating | Lower max input voltage excludes cold-crank support; rated only to +105°C junction | Applicable for cabin-zone modules with tighter input range and lower ambient temperature constraints |
Compared with LM61480QRTWRQ1 and TPS62903-Q1, MAX16903SATB50/V+T uniquely combines AEC-Q100 Grade 0, +42V transient tolerance, spread-spectrum EMI control, and 25μA skip-mode IQ - making it the only option qualified for direct replacement in under-hood 5V rail designs demanding full automotive robustness.
Availability
MAX16903SATB50/V+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, infotainment systems, and gateway modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16903SATB50/V+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, designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX16903 product line delivers high-voltage, high-efficiency buck converters optimized for automotive power rails - specifically engineered to meet AEC-Q100 requirements, cold-crank operation, and EMI-sensitive environments like ADAS and infotainment.
FAQ
What is the maximum input voltage transient tolerance for MAX16903SATB50/V+T?
MAX16903SATB50/V+T tolerates input voltage transients up to +42V for durations less than 1 second. This capability is explicitly validated per AEC-Q100 stress testing and enables reliable operation during automotive load-dump events without external TVS clamping in many designs. The device remains functional throughout the transient and resumes regulation automatically once voltage returns within normal range.
Does MAX16903SATB50/V+T require external compensation components?
No, MAX16903SATB50/V+T uses an internal current-mode control architecture with built-in compensation, eliminating the need for external RC networks. Stability is guaranteed across all operating conditions - including minimum 4.7µH inductor and 10µF output capacitance - as verified in the datasheet's Typical Operating Characteristics and Applications Information sections.
How does the spread-spectrum feature work in MAX16903SATB50/V+T?
In MAX16903SATB50/V+T, spread-spectrum modulation varies the internal 2.1MHz switching frequency by +0% to +6% in a controlled dither pattern. This spreads radiated energy across a wider bandwidth, lowering peak EMI emissions without affecting regulation accuracy or transient response. The feature is enabled by factory configuration (denoted by 'S' prefix in part number) and operates only during internally generated switching - not during external SYNC mode.
What is the purpose of the BIAS pin on MAX16903SATB50/V+T?
The BIAS pin on MAX16903SATB50/V+T provides a regulated +5V internal supply for the IC's logic and gate drivers. It must be bypassed with a 2.2µF ceramic capacitor to GND to ensure stable startup and noise immunity. BIAS also serves as a convenient pull-up source for the open-drain PGOOD signal and can drive the SYNC pin to force fixed-frequency PWM mode.
Can MAX16903SATB50/V+T operate in dropout, and what is the minimum input voltage for regulation at 5V output?
Yes, MAX16903SATB50/V+T operates in dropout by achieving up to 97% duty cycle, allowing regulation down to ~5.15V input at 5V output (VOUT/Duty ≈ 5.0V/0.97). This enables continued operation during severe battery sag such as cold-crank events where input may dip to 3.5V - though full 1A output is not guaranteed below ~6V input due to reduced headroom for switch conduction losses.
MAX16903SATB50/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
MAX16903SATB50/V+T FAQ
1.How can I place an order for MAX16903SATB50/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903SATB50/V+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 MAX16903SATB50/V+T reliable?
The price and inventory of MAX16903SATB50/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16903SATB50/V+T is usually 5 days.
3.What payment methods are accepted for MAX16903SATB50/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903SATB50/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903SATB50/V+T?
MAX16903SATB50/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903SATB50/V+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 MAX16903SATB50/V+T?
For technical support, including MAX16903SATB50/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903SATB50/V+T requirements.
6.How does Aetrix verify that MAX16903SATB50/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16903SATB50/V+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 MAX16903SATB50/V+T meets industry standards.
7.What is the process for return or replacement of MAX16903SATB50/V+T?
All MAX16903SATB50/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903SATB50/V+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 MAX16903SATB50/V+T part is unused and in its original packaging.
Return procedure for MAX16903SATB50/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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