My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX16935RATEB/V+
- Part No.:
- MAX16935RATEB/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16935RATEB/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,566
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX16935RATEB/V+ from Maxim Integrated is a 3.5A, 36V input current-mode synchronous step-down converter with integrated high-side and low-side MOSFETs, 28µA quiescent current, resistor-programmable 220kHz–2.2MHz switching frequency, and fixed 5V output (±2% accuracy). It operates across -40°C to +125°C and supports automotive cold-crank and load-dump conditions up to 42V, making it suitable for navigation head units and RF transceiver power supplies.
For engineers reviewing the MAX16935RATEB/V+ datasheet, MAX16935RATEB/V+ pinout, MAX16935RATEB/V+ application, or MAX16935RATEB/V+ equivalent, key selection considerations include its FPWM/skip mode control via FSYNC, 180° out-of-phase SYNCOUT for cascaded supplies, AEC-Q100 qualification, thermal shutdown with 175°C trip point, and 98% maximum duty cycle for undervoltage transient support.
Technical Context
The MAX16935RATEB/V+ implements current-mode control with cycle-by-cycle overcurrent protection and automatic LX slew-rate adjustment-4ns rise time at >1.1MHz, 8ns below-to optimize EMI while preserving efficiency. Its dual supply inputs (SUP and SUPSW) enable robust operation during automotive transients, including 42V load-dump tolerance and 3.5V cold-crank support.
It integrates a 5V BIAS linear regulator (4.7–5.4V output, ±650mV UVLO hysteresis), open-drain PGOOD with 95%/92% VFB thresholds, and overvoltage protection (107% of regulated output). The device supports external synchronization (1.8–2.6MHz), spread-spectrum modulation (±6%), and soft-start (5.6–12ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V (42V tolerant); enables direct connection to automotive battery rails including cold-crank and load-dump events. |
| Output Current | 3.5A continuous; supports point-of-load regulation for microcontrollers, sensors, and RF ICs in automotive ECUs. |
| Quiescent Current | 28µA at no load; meets ultra-low-power requirements for always-on automotive modules. |
| Switching Frequency | 220kHz to 2.2MHz (resistor- or clock-programmable); allows trade-off between inductor size and switching losses. |
| Output Voltage | Fixed 5V ±2%; eliminates external feedback resistors and simplifies layout for standardized 5V rail generation. |
| Operating Temperature | -40°C to +125°C; qualified per AEC-Q100 Grade 1 for under-hood and infotainment applications. |
| Duty Cycle Max | 98%; sustains regulation during severe input undervoltage transients without dropout. |
Pinout & Package
MAX16935RATEB/V+ is housed in a 16-pin 5mm × 5mm TQFN-EP package with exposed pad connected to PGND for thermal management. Pin count, pad layout, and thermal resistance (θJA = 35°C/W) are optimized for high-power density automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | Provides 180° out-of-phase signal relative to internal oscillator; enables phase interleaving in multi-converter systems to reduce input ripple. |
| 2 – FSYNC | Mode selection & sync input | Drives high or connects to external clock for FPWM; ties to AGND for skip mode-directly controls EMI vs. light-load efficiency trade-off. |
| 3 – FOSC | Frequency setting input | Resistor-to-AGND sets fSW; 12kΩ yields 2.2MHz-enables compact magnetics and fast transient response. |
| 4 – OUT | Regulated output node | Delivers 5V/3.5A; also powers internal circuitry when VOUT ≥ 3V, eliminating need for separate bias supply. |
| 5 – FB | Feedback input | Internally tied to BIAS for fixed 5V; externally configurable for 1V–10V via resistor divider-supports flexible system-level voltage scaling. |
| 9 – BST | High-side gate driver supply | Requires 0.1µF capacitor from BST to LX; ensures proper bootstrap charging for high-side MOSFET conduction. |
| 10 – EN | Enable input | 3.3V–42V logic-compatible; enables direct connection to KL30/KL15 or CAN transceiver INH pins without level-shifting. |
| 11 – SUP | Main supply input | Powers internal LDO; bypassed with 4.7µF ceramic capacitor-decouples logic supply from noisy input rail. |
| 12 – SUPSW | Switch supply input | Powers high-side MOSFET driver; bypassed with 0.1µF + 4.7µF ceramics-separates switch power path from control logic. |
| 13/14 – LX | Switching node | Connects to Schottky diode cathode and inductor; requires external diode for efficiency optimization despite integrated low-side FET. |
| 15 – PGND | Power ground | Separate return path for high-current switch node; must be routed independently from AGND to minimize noise coupling. |
| 16 – PGOOD | Power-good monitor | Open-drain output asserts when VOUT > 95% of regulation; enables precise sequencing with downstream processors and FPGAs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high- and low-side MOSFETs | Reduces external component count by eliminating discrete switches while retaining external Schottky diode for peak efficiency. |
| 180° out-of-phase SYNCOUT | Enables two-phase interleaved operation with second MAX16935/MAX16939 to halve input ripple current and shrink bulk capacitance. |
| FPWM/skip mode selection via FSYNC | Eliminates audible noise and EMI variation in RF-sensitive designs (e.g., car radios) while enabling >90% light-load efficiency in skip mode. |
| Automatic LX slew-rate control | Adjusts gate drive rise time (4ns/8ns) based on fSW to minimize EMI without sacrificing efficiency across full frequency range. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use including temperature cycling, humidity testing, and mechanical shock-ensures reliability in harsh environments. |
| 42V-tolerant SUP/SUPSW inputs | Withstands ISO 7637-2 Pulse 5a (load dump) without external TVS, reducing BOM cost and board space in 12V/24V systems. |
Applications
| Navigation Head Units | RF Transceiver Power Supplies |
|---|---|
Use Scenario: Central infotainment display unit requiring stable 5V rail for ARM-based SoC, touchscreen controller, and audio codec under wide battery voltage swings (6V–16V). IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 3.5A with <100ms startup and seamless cold-crank support down to 3.5V. Use Value: 98% max duty cycle maintains regulation during engine cranking; 28µA quiescent current extends battery life in parked state. |
Use Scenario: Power supply for LTE/5G cellular modem in telematics control unit where strict EMI limits apply near antenna circuits. IC Role / Device Role / Timing Role: Fixed-frequency FPWM-mode 5V source synchronized to baseband clock to suppress switching harmonics in receive band. Use Value: FSYNC-driven FPWM eliminates frequency dither, enabling compliance with CISPR 25 Class 5 radiated emissions limits. |
| Automotive ADAS Camera Modules | Distributed DC Power Systems |
Use Scenario: Compact rear-view camera ECU powered from vehicle battery, operating continuously with thermal constraints in sealed housing. IC Role / Device Role / Timing Role: High-efficiency 5V PoL converter with thermal shutdown (175°C) and automatic recovery for unattended operation. Use Value: TQFN-EP package with θJA = 35°C/W enables >2.5W dissipation without heatsink; AEC-Q100 ensures field reliability. |
Use Scenario: Multi-rail power architecture in commercial vehicle gateway ECU requiring coordinated sequencing of 5V, 3.3V, and 1.8V rails. IC Role / Device Role / Timing Role: First-stage 5V buck supplying downstream LDOs and secondary buck converters; PGOOD and SYNCOUT enable timing coordination. Use Value: PGOOD output triggers enable signals for downstream regulators; SYNCOUT synchronizes second-stage converters to reduce system-level ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16939RATEB/V+ | Same pinout and package; differs only in OVP threshold (105% vs. 107%) and skip-mode current threshold (200–500mA vs. 150–400mA). | Better suited for systems requiring tighter overvoltage clamping, e.g., sensitive analog sensor interfaces. | Select MAX16939RATEB/V+ when OVP margin must be minimized; otherwise MAX16935RATEB/V+ offers broader skip-mode flexibility. |
| LM61480QRNXTQ1 | 3.5A, 36V, 2.1MHz buck with 15µA IQ; no integrated low-side FET; requires external high-side/low-side or synchronous rectifier. | Lacks FPWM/skip mode pin control and 180° SYNCOUT; uses external compensation and lacks AEC-Q100 Grade 1 validation. | Choose LM61480QRNXTQ1 only if lower IQ is critical and system-level EMI control is handled elsewhere; MAX16935RATEB/V+ provides superior integration for automotive timing-critical designs. |
Compared with MAX16939RATEB/V+, the MAX16935RATEB/V+ offers higher OVP threshold and wider skip-mode current range, enhancing robustness in variable-load automotive subsystems; versus LM61480QRNXTQ1, it delivers complete AEC-Q100-qualified integration-including FPWM control, SYNCOUT, and thermal recovery-without requiring external MOSFETs or complex loop compensation.
Availability
MAX16935RATEB/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics gateways requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for MAX16935RATEB/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, emphasizing high-reliability, low-power, and AEC-Q100-compliant solutions.
The MAX16935/MAX16939 product line targets automotive power conversion with emphasis on cold-crank resilience, EMI control, and functional safety-delivering integrated, thermally robust buck regulators for next-generation vehicle electronics.
FAQ
What is the maximum input voltage the MAX16935RATEB/V+ can withstand during load-dump events?
The MAX16935RATEB/V+ supports up to 42V on both SUP and SUPSW pins for ≤1 second during ISO 7637-2 Pulse 5a load-dump events. This rating is validated per AEC-Q100 stress testing and does not require external TVS diodes in typical 12V automotive applications. The device remains functional and regulates output throughout the transient, provided thermal limits are observed.
How does the MAX16935RATEB/V+ achieve 28µA quiescent current, and what conditions apply?
The MAX16935RATEB/V+ achieves 28µA quiescent current in standby mode with no load, VOUT = 5V, and FSYNC = 0V (skip mode enabled). This value is measured at TA = +25°C and drops further at lower temperatures. The ultra-low IQ results from optimized bias circuitry, deep sleep states in control logic, and minimal leakage in integrated MOSFETs-all verified across the -40°C to +125°C range.
Can the MAX16935RATEB/V+ operate in forced PWM mode across all load conditions, and how is it configured?
Yes, the MAX16935RATEB/V+ supports fixed-frequency forced PWM (FPWM) mode across 0–3.5A load range by driving FSYNC high (to BIAS or external clock) instead of grounding it. In FPWM mode, the low-side MOSFET actively conducts during light loads, eliminating frequency variation and minimizing EMI-critical for RF transceiver power supplies. The device maintains regulation and PGOOD assertion throughout.
What is the purpose of the 180° out-of-phase SYNCOUT signal, and how is it used in practice?
The SYNCOUT pin outputs an open-drain 180° out-of-phase clock relative to the internal oscillator, enabling phase interleaving when cascading multiple MAX16935RATEB/V+ devices. In practice, connecting SYNCOUT of one device to FSYNC of another creates two-phase operation, reducing input capacitor RMS current by ~30% and easing EMI filter design-commonly deployed in high-current infotainment power trees.
Does the MAX16935RATEB/V+ require an external Schottky diode even though it has an integrated low-side MOSFET?
Yes, the MAX16935RATEB/V+ requires an external Schottky diode between LX and AGND despite its integrated low-side MOSFET. The diode improves light-load efficiency and ensures reliable operation during boundary conduction mode and transient overload conditions. The datasheet specifies diode parameters (e.g., 40V/5A, low VF) and placement-failure to include it risks instability and reduced efficiency at partial load.
MAX16935RATEB/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN 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:
- 3.5A
- Frequency - Switching:
- 220kHz ~ 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX16935RATEB/V+ FAQ
1.How can I place an order for MAX16935RATEB/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935RATEB/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 MAX16935RATEB/V+ reliable?
The price and inventory of MAX16935RATEB/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16935RATEB/V+ is usually 5 days.
3.What payment methods are accepted for MAX16935RATEB/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935RATEB/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935RATEB/V+?
MAX16935RATEB/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935RATEB/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 MAX16935RATEB/V+?
For technical support, including MAX16935RATEB/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935RATEB/V+ requirements.
6.How does Aetrix verify that MAX16935RATEB/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16935RATEB/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 MAX16935RATEB/V+ meets industry standards.
7.What is the process for return or replacement of MAX16935RATEB/V+?
All MAX16935RATEB/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935RATEB/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 MAX16935RATEB/V+ part is unused and in its original packaging.
Return procedure for MAX16935RATEB/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX16935RATEB/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…
