My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX16909SAUE/V+
- Part No.:
- MAX16909SAUE/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16909SAUE/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,179
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX16909SAUE/V+ from Maxim Integrated is a 3A, current-mode, automotive-grade step-down DC-DC converter with integrated 70mΩ high-side MOSFET, operating from 3.5V to 36V input and delivering 5V fixed or 1V–10V adjustable output. It features 30µA standby current, 220kHz–1MHz resistor-programmable switching frequency, and operates across –40°C to +125°C for engine control units and ADAS power rails.
For engineers reviewing the MAX16909SAUE/V+ datasheet, MAX16909SAUE/V+ pinout, MAX16909SAUE/V+ application, or MAX16909SAUE/V+ equivalent, key selection criteria include its 42V transient tolerance, skip-mode light-load efficiency, PGOOD monitoring, thermal shutdown with 15°C hysteresis, and compatibility with cold-crank (98% duty cycle) and load-dump conditions in 12V/24V automotive systems.
Technical Context
The MAX16909SAUE/V+ implements constant-frequency current-mode control with internal transconductance error amplifier (gm = 900µS), 110ns minimum on-time, and fast-loop architecture enabling stable regulation during line/load transients. Its dual-supply inputs (SUP and SUPSW) decouple bias and switch-driver power paths, supporting undervoltage operation down to 3.5V while maintaining >98% duty cycle during cold-crank events.
It integrates a 5V BIAS LDO (4.7–5.5V output, 3.1V UVLO threshold), synchronization input (FSYNC) accepting external clocks up to 10% above internal fSW, and robust protection including overvoltage trip at 110% VFB, thermal shutdown at +175°C, and automatic-recovery overload handling with 16ms hiccup timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports full automotive battery range including cold-crank (≥9V) and load-dump (≤42V transient) |
| Output Current | 3A continuous - enables single-chip supply for microcontrollers, sensors, and CAN transceivers |
| Quiescent Current | 30µA at no load - extends battery life in always-on vehicle modules (e.g., telematics, alarm systems) |
| Switching Frequency | 220kHz to 1MHz - adjustable via FOSC resistor; higher frequencies reduce inductor size and output capacitance |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable (via external resistive divider) - simplifies design for multiple rail requirements |
| Thermal Protection | +175°C shutdown with +15°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking |
| Power-Good Threshold | 95% VFB rising / 92.5% VFB falling - provides precise sequencing signal for downstream logic and processors |
Pinout & Package
MAX16909SAUE/V+ is packaged in a 16-pin TSSOP with exposed pad (EP), optimized for thermal dissipation in high-power-density automotive PCBs. The exposed pad must be soldered to a large contiguous copper ground plane but cannot serve as the sole GND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | Synchronization input | Accepts external clock ≥10% above internal fSW; connect to GND for internal oscillator use |
| 2 (FOSC) | Frequency-setting input | Resistor-to-GND sets fSW (e.g., 65kΩ → 400kHz); enables noise-sensitive or EMI-constrained designs |
| 3 (PGOOD) | Open-drain power-good monitor | Signals valid regulation (92.5–95% VFB) for safe system startup and fault detection |
| 4 (OUT) | Switch regulator output | Delivers regulated voltage; powers internal circuitry when VOUT = 3–5V in standby mode |
| 5 (FB) | Feedback input | Connect to BIAS for 5V fixed output; connect to resistive divider for 1V–10V adjustment |
| 6 (COMP) | Error amplifier output | External RC network (e.g., 47kΩ + 2.7nF) stabilizes loop for ceramic or polymer output capacitors |
| 7 (BIAS) | Integrated 5V LDO output | Powers internal logic; requires 1µF ceramic bypass to GND; UVLO at 3.1V ensures clean enable behavior |
| 8 (GND) | Analog/digital ground reference | Primary return path; EP must be connected separately to same ground plane |
| 9 (BST) | Bootstrap supply for high-side driver | 0.1µF capacitor between BST and LX enables gate drive above input rail; critical for MOSFET turn-on |
| 10 (SUP) | Main supply input | Powers internal LDO and logic; requires ≥4.7µF ceramic decoupling to GND |
| 11–12 (LX) | Switch node | Connects to inductor and Schottky freewheeling diode; handles peak currents up to 4A RMS |
| 13–14 (SUPSW) | High-side switch supply | Powers internal MOSFET driver; requires 0.1µF + 4.7µF decoupling; tolerates 42V transients |
| 15 (EN) | Enable input | Logic-compatible with 3.3V/5V/12V sources; 2V high-threshold allows direct connection to KL30 or CAN INH |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional; serves internal test or trimming purpose |
| EP | Exposed thermal pad | Required for thermal performance; connects to GND plane but not substitute for Pin 8 (GND) |
Key Features
| Feature | Design Value |
|---|---|
| 42V input transient tolerance | Withstands ISO 7637-2 Pulse 5a (load dump) without external clamping, reducing BOM count and board space |
| 98% max duty cycle during undervoltage | Maintains regulation down to 3.5V input (e.g., cold-crank), eliminating need for pre-regulator in 12V systems |
| 30µA standby current | Enables <100µA system sleep current when paired with low-IQ downstream regulators in always-on modules |
| Integrated 3A/70mΩ high-side switch | Eliminates external MOSFET and driver, reducing solution size and improving efficiency vs. discrete buck controllers |
| Adjustable soft-start (8.5ms) | Prevents inrush current into large output capacitors (up to 500µF), protecting input source and output rail stability |
| Fast load-transient response | Recovers from 0.5A–3A steps within 100µs (AC-coupled), minimizing voltage droop/overshoot on sensitive analog or RF rails |
Applications
| Automotive Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Powering 3.3V/5V rails for microcontroller, CAN transceiver, and sensor interfaces in under-hood ECUs exposed to wide temperature and voltage transients. IC Role / Device Role / Timing Role: Primary 3A buck regulator providing stable, sequenced, and monitored power with cold-crank support and load-dump immunity. Use Value: Eliminates need for external TVS or pre-regulator; 30µA IQ meets OEM sleep-current budgets; PGOOD enables safe MCU reset sequencing. |
Use Scenario: Supplying 1.8V/3.3V for radar SoCs, camera ISPs, and Ethernet PHYs in front-camera or surround-view modules. IC Role / Device Role / Timing Role: Point-of-load regulator with fast transient response and low noise, synchronized to system clock via FSYNC to avoid beat frequencies. Use Value: 110ns min on-time supports high VIN/VOUT ratios (e.g., 12V→1.8V @ 1MHz); skip mode maintains >85% efficiency at 10mA loads. |
| Industrial Vehicle Telematics | Railway Onboard Electronics |
|
Use Scenario: Powering GPS/GNSS receivers, cellular modems, and secure boot MCUs in fleet management gateways operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-reliability DC-DC converter with thermal shutdown, overvoltage lockout, and robust EN interface compatible with vehicle ignition signals. Use Value: 5µA shutdown current enables multi-year battery backup; 16-pin TSSOP with EP meets IPC-A-610 Class 3 soldering standards for vibration-prone environments. |
Use Scenario: Generating 5V/3.3V for train control logic, door controllers, and passenger information displays subjected to EN 50155-compliant 40V transients and extended temperature cycling. IC Role / Device Role / Timing Role: Automotive-qualified buck converter meeting AEC-Q100 Grade 1, used as primary power stage with redundant PGOOD monitoring. Use Value: 42V transient rating exceeds EN 50155 requirement; -40°C to +125°C operation covers full railway thermal envelope; BIAS LDO simplifies auxiliary rail generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQDPRRQ1 | 42V input, 3.5A, 2.2MHz max fSW, no integrated BIAS LDO, requires external bootstrap capacitor | Higher switching frequency enables smaller magnetics; lacks integrated 5V bias rail, increasing external component count | Choose LM5143AQDPRRQ1 when board space is constrained and 2.2MHz operation is acceptable; MAX16909SAUE/V+ preferred when BIAS simplification and lower EMI are priorities |
| TPS543B20RTWT | 18V input, 3A, 1MHz max fSW, integrated MOSFETs, digital interface (PMBus), no cold-crank support below 4.5V | Digital configurability and telemetry; limited to 18V max input, unsuitable for 24V truck or load-dump scenarios | Choose TPS543B20RTWT for programmable voltage sequencing and telemetry in non-automotive industrial systems; MAX16909SAUE/V+ remains optimal for 36V automotive input compliance |
Compared with LM5143AQDPRRQ1 and TPS543B20RTWT, MAX16909SAUE/V+ uniquely combines 36V input, 42V transient tolerance, integrated 5V BIAS LDO, and cold-crank capability in a single 16-pin TSSOP-reducing bill-of-materials and layout complexity for cost-sensitive automotive power designs.
Availability
MAX16909SAUE/V+ is available at Aetrix Electronics and suitable for automotive engine control, ADAS domain controllers, and industrial telematics requiring stable component supply with AEC-Q100 qualification, long-term lifecycle support, and traceable sourcing.
Supply support for MAX16909SAUE/V+ 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 MAX16909 product line delivers high-efficiency, high-reliability DC-DC converters specifically engineered for automotive power systems subject to extreme voltage transients, wide temperature ranges, and stringent low-quiescent-current requirements.
FAQ
What is the maximum input voltage transient the MAX16909SAUE/V+ can withstand?
The MAX16909SAUE/V+ withstands input transients up to 42V for durations less than 1 second, complying with ISO 7637-2 Pulse 5a (load dump) requirements. This eliminates the need for external TVS diodes in most automotive 12V and 24V systems, reducing component count and board area. The device continues normal operation during these events due to robust internal protection circuitry and high-duty-cycle capability.
How does the MAX16909SAUE/V+ achieve 30µA quiescent current in standby mode?
The MAX16909SAUE/V+ achieves 30µA standby current by entering skip mode, where most internal circuitry-including the BIAS LDO-is powered from VOUT (when 3V–5.5V) instead of SUP/SUPSW, and switching ceases until output voltage drops below regulation threshold. This architecture is confirmed in the datasheet's Electrical Characteristics table (ISUP_STANDBY = 30µA typ at VOUT = 5V, TA = +25°C) and Detailed Description section.
Can the MAX16909SAUE/V+ operate with an input voltage as low as 3.5V while maintaining regulation?
Yes, the MAX16909SAUE/V+ operates from 3.5V to 36V and maintains regulation down to 3.5V input by achieving up to 98% duty cycle during undervoltage transients such as cold-crank. This is explicitly stated in the General Description and Detailed Description sections, and verified by the "Undervoltage Pulse" test waveform (MAX16909 toc10) showing stable 1.8V output at VSUPSW = 5V.
What package type and thermal characteristics does the MAX16909SAUE/V+ use?
The MAX16909SAUE/V+ uses a 16-pin TSSOP package with exposed pad (EP), specified with junction-to-ambient thermal resistance (θJA) of 38.3°C/W on a 4-layer JEDEC board. The exposed pad must be soldered to a large contiguous copper ground plane to achieve rated power dissipation (2088.8mW at +70°C ambient). Thermal shutdown activates at +175°C with 15°C hysteresis.
Does the MAX16909SAUE/V+ support synchronization to an external clock, and what are the requirements?
Yes, the MAX16909SAUE/V+ supports external clock synchronization via the FSYNC pin. The external clock frequency must exceed the internal oscillator frequency by at least 10% for reliable acquisition, and the input thresholds are VFSYNC_HI = 1.4V (rising) and VFSYNC_LO = 0.4V (falling). This feature is documented in the Electrical Characteristics table and Pin Descriptions section, enabling EMI reduction through frequency alignment in multi-rail systems.
MAX16909SAUE/V+ 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:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (5V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 3A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MAX16909SAUE/V+ FAQ
1.How can I place an order for MAX16909SAUE/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16909SAUE/V+ 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 MAX16909SAUE/V+ reliable?
The price and inventory of MAX16909SAUE/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16909SAUE/V+ is usually 5 days.
3.What payment methods are accepted for MAX16909SAUE/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16909SAUE/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16909SAUE/V+?
MAX16909SAUE/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16909SAUE/V+ 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 MAX16909SAUE/V+?
For technical support, including MAX16909SAUE/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16909SAUE/V+ requirements.
6.How does Aetrix verify that MAX16909SAUE/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16909SAUE/V+ 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 MAX16909SAUE/V+ meets industry standards.
7.What is the process for return or replacement of MAX16909SAUE/V+?
All MAX16909SAUE/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16909SAUE/V+, 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 MAX16909SAUE/V+ part is unused and in its original packaging.
Return procedure for MAX16909SAUE/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX16909SAUE/V+ 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…
