My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX16903RAUE50+
- Part No.:
- MAX16903RAUE50+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16903RAUE50+.pdf
- Description:
- IC REG BUCK 5V 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,066
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX16903RAUE50+ from Maxim Integrated is a synchronous buck DC-DC converter with integrated high-side and low-side MOSFETs, delivering 1A output at fixed 5V with input voltage range +3.5V to +28V, 25μA quiescent current in skip mode, and 2.1MHz switching frequency. It features PGOOD monitoring, AEC-Q100 qualification, and operation down to -40°C for automotive cold-crank support.
For engineers reviewing the MAX16903RAUE50+ datasheet, MAX16903RAUE50+ pinout, MAX16903RAUE50+ application, or MAX16903RAUE50+ equivalent, this page provides verified package mapping (16-pin TSSOP-EP), confirmed thermal performance (θJA = 38.3°C/W), validated pin functions including SYNC-controlled mode selection, and real-world EMI mitigation via spread-spectrum option availability.
Technical Context
The MAX16903RAUE50+ uses current-mode control with internal slope compensation and no external compensation required. Its 80ns minimum on-time enables stable regulation across wide input ranges, while 97% dropout duty cycle supports operation during automotive battery sag.
SYNC pin logic determines operating mode: grounded/unconnected enables skip mode (25μA IQ); biased to BIAS or driven by external clock forces fixed-frequency PWM (2.1MHz ±6.25%). Spread-spectrum modulation-when enabled-shifts frequency +6% only, preserving AM-band immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2.5% over -40°C to +125°C, enabling direct replacement of LDOs in 5V rail systems. |
| Input Voltage Range | +3.5V to +28V continuous, tolerates +42V transients - meets ISO 7637-2 Pulse 5a requirements for automotive battery systems. |
| Switching Frequency | 2.1MHz typical, with ±6.25% variation; allows use of ≤4.7µH inductors and <10µF ceramic output capacitors. |
| Quiescent Current | 25μA in skip mode at no load - sustains >1-year battery standby in always-on automotive modules. |
| Output Current | 1A continuous, with 1.5A peak current limit and hiccup-mode short-circuit protection. |
| Thermal Range | -40°C to +125°C ambient, junction-rated to +150°C - qualified per AEC-Q100 Grade 0. |
| Package | 16-pin TSSOP-EP (5mm × 4.4mm), exposed pad soldered to PGND for θJA = 38.3°C/W. |
Pinout & Package
MAX16903RAUE50+ is housed in a thermally enhanced 16-pin TSSOP-EP package (5mm × 4.4mm, 0.65mm pitch) with exposed pad connected to PGND for optimal heat dissipation. Pin functions are electrically identical across all MAX16903 variants; this variant uses dual SUP, LX, and PGND pins internally tied together per package layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | SUP | Main power input (3.5–28V); requires 4.7µF ceramic capacitor placed adjacent to both pins. |
| 2, 3 | GND | Analog ground reference; must be connected to PGND only at output capacitor return point. |
| 4, 5 | PGND | Power ground return for LX switch node and output capacitor; ties to exposed pad. |
| 6, 7 | PGOOD | Open-drain power-good signal active above 93% VOUT; requires external 20kΩ pull-up. |
| 8 | SYNC | Mode-select input: GND/unconnected → skip mode; BIAS or clock → forced PWM. |
| 9, 10, 16 | N.C. | No internal connection; must remain unconnected per datasheet. |
| 11 | LX | Switch node connecting internal HS/LS FETs to external inductor; high dv/dt node. |
| 12 | BIAS | +5V internal logic supply; bypass with 2.2µF ceramic to GND. |
| 13 | OUTS | Feedback sense input for 5V output; connects to output capacitor via 10µF X7R ceramic. |
| 14 | EN | Enable input compatible from 3.3V logic to +42V; no internal pullup/pulldown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | High-side (400–800mΩ) and low-side (250–450mΩ) DMOS FETs eliminate external MOSFETs and gate drivers. |
| AEC-Q100 Qualified | Grade 0 (-40°C to +125°C) qualification ensures reliability in engine bay and ADAS ECU applications. |
| Dropout Operation | 97% duty cycle capability maintains regulation during cold-crank events down to 3.5V input. |
| EMI Reduction | Optional spread-spectrum modulation (+6%) and 2.1MHz fixed frequency avoid AM band (0.53–1.71MHz). |
| Robust Protection | Overcurrent (1.5A typ), thermal shutdown (175°C), and UVLO (3.0V hysteresis) enable fault-tolerant design. |
Applications
| Automotive Body Control Module | Industrial Sensor Hub Power |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and analog sensors in door module under battery voltage fluctuations from 6V to 16V. IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD supervision and cold-crank support. Use Value: Maintains 5V output during 3.5V cranking dips without brownout; 25μA IQ extends battery life in sleep mode. |
Use Scenario: Converting 24V industrial bus to regulated 5V for MEMS accelerometers, temperature sensors, and wireless SoCs. IC Role / Device Role / Timing Role: High-input-voltage DC-DC converter with transient tolerance up to +42V. Use Value: Eliminates need for pre-regulator stage; 2.1MHz switching reduces filter size by >50% vs. 500kHz alternatives. |
| ADAS Camera Power Supply | Telematics Control Unit (TCU) |
Use Scenario: Providing clean, low-noise 5V to image sensor and ISP in rear-view camera exposed to engine heat. IC Role / Device Role / Timing Role: Thermally robust buck converter with exposed-pad thermal path and spread-spectrum EMI control. Use Value: θJA = 38.3°C/W enables full 1A load at +105°C ambient; spread-spectrum reduces radiated emissions near RF receivers. |
Use Scenario: Powering LTE modem, GNSS receiver, and MCU in vehicle telematics unit with always-on connectivity. IC Role / Device Role / Timing Role: Low-quiescent-current buck regulator supporting wake-on-CAN and periodic data transmission. Use Value: 25μA skip-mode IQ meets OEM 100μA system standby limits; SYNC pin enables synchronized switching with other rails. |
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 | 3.5–36V input, 5V fixed output, 8A rating, 2.1MHz, but larger 16-pin WQFN (3×3mm) and higher IQ (26μA). | Targeted at higher-current ADAS domains; lacks cold-crank optimized UVLO hysteresis. | Select when >1A load headroom or ASIL-B functional safety support is required. |
| TPS62933QPWPRQ1 | 3–36V input, 5V fixed output, 3A rating, 2.2MHz, 15μA IQ, but no spread-spectrum option and smaller 12-pin VQFN (2.5×3mm). | Optimized for space-constrained infotainment; lacks +42V transient tolerance and AEC-Q100 Grade 0 rating. | Select when board area is critical and EMI is managed via layout, not modulation. |
Compared with LM61480QRTWRQ1 and TPS62933QPWPRQ1, the MAX16903RAUE50+ delivers precise 1A capability in a mature AEC-Q100-qualified TSSOP package with proven cold-crank behavior and optional spread-spectrum - making it optimal for cost-sensitive, thermally demanding body electronics where 1A suffices.
Availability
MAX16903RAUE50+ is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor hubs, ADAS camera power supplies, and telematics control units requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX16903RAUE50+ 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, emphasizing high-reliability, AEC-Q100-qualified solutions.
The MAX16903RAUE50+ belongs to Maxim's automotive-grade mini-buck converter family, engineered specifically for high-input-voltage, low-IQ power conversion in space- and thermal-constrained ECUs.
FAQ
What is the exact output voltage tolerance of the MAX16903RAUE50+ over temperature?
The MAX16903RAUE50+ delivers 5.0V output with ±2.5% accuracy over -40°C to +125°C ambient temperature in fixed-frequency mode, and ±4% in skip mode. This is specified in the Electrical Characteristics table (page 3 of datasheet Rev 10), where VOUT,5V min/max values are explicitly defined across full temperature range and load conditions.
Does the MAX16903RAUE50+ require external compensation components?
No, the MAX16903RAUE50+ uses current-mode control with internal slope compensation and does not require external compensation components. The datasheet states "requires no external compensation network" in the Detailed Description section (page 8), and all typical operating circuits show zero external compensation parts.
Can the MAX16903RAUE50+ operate during automotive cold-crank conditions?
Yes, the MAX16903RAUE50+ operates down to +3.5V input and supports 97% duty cycle in dropout, enabling continuous 5V output during cold-crank events. Its UVLO threshold is 3.0V with 0.4V hysteresis, and it tolerates +42V transients - meeting ISO 7637-2 Pulse 5a requirements as stated in the Benefits and Features section.
Is spread-spectrum modulation enabled on the MAX16903RAUE50+?
No, the MAX16903RAUE50+ has spread-spectrum disabled. Per the Selector Guide (page 12), "RA" prefix indicates no spread-spectrum; only "SA" variants (e.g., MAX16903SAUE50+) include this feature. The "R" denotes standard frequency version, confirmed in the Ordering Information table.
What is the thermal resistance (θJA) of the MAX16903RAUE50+ package?
The MAX16903RAUE50+ in its 16-pin TSSOP-EP package has a junction-to-ambient thermal resistance (θJA) of 38.3°C/W, measured per JEDEC JESD51-7 on a four-layer board. This value is listed in the Package Thermal Characteristics table (page 2) and enables 1A operation at +105°C ambient with proper PCB copper area.
MAX16903RAUE50+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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:
- 16-TSSOP-EP
MAX16903RAUE50+ FAQ
1.How can I place an order for MAX16903RAUE50+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903RAUE50+ 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 MAX16903RAUE50+ reliable?
The price and inventory of MAX16903RAUE50+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16903RAUE50+ is usually 5 days.
3.What payment methods are accepted for MAX16903RAUE50+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903RAUE50+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903RAUE50+?
MAX16903RAUE50+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903RAUE50+ 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 MAX16903RAUE50+?
For technical support, including MAX16903RAUE50+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903RAUE50+ requirements.
6.How does Aetrix verify that MAX16903RAUE50+ is sourced from the original manufacturer or authorized distributors?
All MAX16903RAUE50+ 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 MAX16903RAUE50+ meets industry standards.
7.What is the process for return or replacement of MAX16903RAUE50+?
All MAX16903RAUE50+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903RAUE50+, 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 MAX16903RAUE50+ part is unused and in its original packaging.
Return procedure for MAX16903RAUE50+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX16903RAUE50+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
