My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX17640CATA+
- Part No.:
- MAX17640CATA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX17640CATA+.pdf
- Description:
- IC REG BUCK ADJ 400MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,159
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX17640CATA+ from Analog Devices is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, operating from 4.5V to 60V input and delivering up to 400mA. It features adjustable output (0.9V to 0.89×VIN), peak-current-mode control, and dual PFM/PWM mode selection via the MODE pin-designed for industrial sensors and 4–20mA current loops where compact size and light-load efficiency are critical.
For engineers reviewing the MAX17640CATA+ datasheet, MAX17640CATA+ pinout, MAX17640CATA+ application, or MAX17640CATA+ equivalent, key selection factors include its 8-pin 2mm×2mm TDFN package, internal soft-start, open-drain RESET monitoring, EN/UVLO programmability, and 92% peak efficiency at full load.
Technical Context
The MAX17640CATA+ employs a fixed-frequency, internally compensated peak-current-mode architecture with slope compensation. Its MODE pin latches at power-up to select between constant-frequency PWM (MODE = GND) or light-load-optimized PFM (MODE unconnected), directly affecting inductor current behavior and switching frequency stability.
It integrates a 5V internal LDO (VCC) with 4.75V–5.25V regulation and 150mV dropout, supports monotonic startup into prebiased outputs, and implements hiccup-mode overcurrent protection with auto-retry. Output voltage is set via external resistor divider on FB/VOUT, referenced to a precise 0.9V (±1.3%) internal bandgap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide industrial input rails including 24V, 36V, and 48V systems without external pre-regulation. |
| Output Current | Up to 400mA - sufficient for powering microcontrollers, analog front-ends, and isolated interface ICs in point-of-load applications. |
| Output Voltage Range | 0.9V to 0.89×VIN - enables flexible rail generation (e.g., 1.8V, 2.5V, 3.3V, 5V, 12V, 15V) using only two external resistors. |
| Switching Frequency | 465kHz to 535kHz - fixed-frequency operation in PWM mode ensures predictable EMI filtering and avoids audible noise. |
| Peak Efficiency | 92% - achieved via low RDS(on) integrated pMOS (1.75Ω typ) and nMOS (0.6Ω typ), reducing thermal stress and PCB area. |
| Shutdown Current | 2.2µA (typ) - enables ultra-low-power system standby states without external disconnect circuitry. |
| Operating Temperature | −40°C to +125°C ambient - qualified for harsh industrial environments including HVAC and building control systems. |
Pinout & Package
MAX17640CATA+ is housed in an 8-pin, 2mm × 2mm TDFN package (package code T822CN+1) with exposed thermal pad for enhanced power dissipation. The compact footprint supports ultra-dense PCB layouts and meets Class B CISPR32 emissions requirements without additional shielding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply connection (4.5V–60V); requires local 1µF ceramic bypass to GND for stability and noise suppression. |
| EN/UVLO | Enable / Input UVLO Input | Active-high logic input; resistor-divider from VIN sets turn-on threshold (e.g., 12V or 24V system enable); pulls low to disable regulator. |
| VCC | Internal LDO Output | 5V regulated supply for internal circuitry and gate drivers; must be bypassed with ≥1µF ceramic capacitor to GND. |
| FB/VOUT | Feedback Input | Connects to resistor divider for adjustable output; internal 0.9V reference enables precise VOUT = 0.9V × (1 + R1/R2). |
| MODE | Control Mode Selection | Ground for forced-PWM (constant fSW); floating for PFM (light-load pulse skipping and no negative inductor current). |
| RESET | Open-Drain Reset Monitor | Pulls low when VOUT < 92% of regulation; high-impedance after VOUT > 95% for 2ms - enables system-level power-good signaling. |
| GND | Power Ground | Common return path for VIN, LX, and VCC; must connect to solid ground plane at single-point for EMI and stability. |
| LX | Switch Node | Connects to inductor switch node; high-impedance during shutdown; drives external 68µH inductor in typical 5V/400mA design. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Eliminates external Schottky diode - reduces conduction loss, improves efficiency by ~5–8% vs. asynchronous designs, and simplifies layout. |
| Internal Compensation | No external compensation components required - reduces BOM count, saves board space, and guarantees stable loop response across all operating conditions. |
| Programmable EN/UVLO | Resistor-divider on EN/UVLO sets precise input turn-on voltage (e.g., 15V ±3%) - prevents brownout operation and enables sequenced power-up in multi-rail systems. |
| Monotonic Prebias Startup | Starts cleanly into precharged output without discharging capacitor - essential for FPGA, MCU, or ADC power domains sharing common bulk capacitance. |
| Open-Drain RESET with Hysteresis | Provides reliable power-good indication with 3% hysteresis (92%–95%) and 2ms delay - eliminates need for external supervisor IC in cost-sensitive industrial nodes. |
Applications
| Industrial Sensors | 4–20mA Current Loops |
|---|---|
Use Scenario: Powering analog sensor signal conditioning circuits (e.g., strain gauge amplifiers, RTD interfaces) in factory-floor environments with fluctuating 24V DC bus. IC Role / Device Role / Timing Role: Primary point-of-load regulator generating stable 3.3V or 5V rail from noisy 24V supply; provides clean, low-noise bias for precision op-amps and ADCs. Use Value: 92% peak efficiency and 2.2µA shutdown current extend battery life in wireless sensor nodes; −40°C to +125°C rating ensures reliability in uncontrolled enclosures. | Use Scenario: Supplying loop-powered transmitter electronics (e.g., pressure transmitters) requiring regulated 5V or 3.3V while maintaining 4–20mA compliance. IC Role / Device Role / Timing Role: High-voltage input buck converter stepping down 36V loop supply to 5V for microcontroller and DAC; MODE pin configures PFM for ultra-low quiescent current during sleep cycles. Use Value: Adjustable output allows direct generation of 5V for DAC reference and 3.3V for MCU core-eliminating second-stage LDO and associated dropout loss. |
| HVAC and Building Control | High-Voltage LDO Replacement |
Use Scenario: Powering zone controllers, damper actuators, and communication modules (e.g., BACnet MS/TP) operating from 24V AC/DC or 48V PoE-derived supplies. IC Role / Device Role / Timing Role: Compact 2mm×2mm buck regulator replacing discrete buck + LDO solutions; delivers 400mA at 3.3V with internal soft-start to avoid inrush tripping upstream breakers. Use Value: Integrated MOSFETs and all-ceramic capacitor support reduce solution size by >40% vs. legacy designs; hiccup-mode OCP protects against shorted actuator wiring. | Use Scenario: Replacing inefficient 60V-input linear regulators (e.g., LM317-based) in legacy industrial equipment where heat sinking is impractical. IC Role / Device Role / Timing Role: Efficient step-down converter delivering 5V/400mA from 48V bus; replaces 43V dropout loss of LDO with <1W dissipation vs. >3W in linear solution. Use Value: 92% efficiency cuts thermal load by >75%, enabling sealed enclosure operation without heatsinks or fans-reducing system cost and failure risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QWRGRRQ1 | 4.5V–65V input, 300mA output, 500kHz fSW, no integrated VCC LDO - requires external bias supply. | Lacks internal 5V LDO and RESET monitor; needs external supervisor for power-good signaling. | Choose when higher input voltage margin (65V) is required and external bias is acceptable; not drop-in due to missing VCC and RESET functionality. |
| TPS54340DDAR | 3.5V–42V input, 3.5A output, external MOSFETs, 100kHz–2.5MHz adjustable fSW, no PFM mode. | Higher current capability but larger solution size; lacks PFM for light-load efficiency and integrated feedback divider. | Prefer for higher-output-current (>400mA) or wider frequency tuning needs; not suitable for space-constrained or ultra-low-quiescent designs. |
Compared with LM5164QWRGRRQ1 and TPS54340DDAR, the MAX17640CATA+ offers superior integration (internal VCC LDO, RESET, soft-start, compensation), smaller footprint (2mm×2mm vs. 3mm×3mm+), and PFM mode for sub-100µA system standby - making it optimal for compact, low-power industrial point-of-load applications.
Availability
MAX17640CATA+ is available at Aetrix Electronics and suitable for industrial sensors, 4–20mA current loops, and HVAC control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX17640CATA+ 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 power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX17640 family belongs to Analog Devices' Himalaya power portfolio, engineered specifically for cooler, smaller, and simpler industrial power supplies - emphasizing high voltage range, integrated FETs, and robust operation in harsh environments.
FAQ
What is the output voltage range supported by the MAX17640CATA+?
The MAX17640CATA+ supports an adjustable output voltage range from 0.9V to 0.89×VIN. This is achieved using an external resistor divider connected to the FB/VOUT pin, referenced to the device's precise 0.9V internal bandgap. For example, with VIN = 24V, the maximum output is 21.4V; with VIN = 12V, it is 10.7V. The MAX17640CATA+ does not support fixed-output variants - only the adjustable configuration.
How does the MODE pin affect efficiency and switching behavior in the MAX17640CATA+?
The MODE pin on the MAX17640CATA+ selects between two distinct operating modes: grounding MODE enables forced-PWM (constant 500kHz switching), while leaving MODE unconnected enables PFM mode. In PFM, the MAX17640CATA+ skips pulses at light loads and disables negative inductor current, achieving >85% efficiency at 10mA load - significantly higher than PWM mode at the same condition. PWM ensures EMI predictability; PFM maximizes battery runtime.
Can the MAX17640CATA+ start up into a prebiased output, and why does that matter?
Yes, the MAX17640CATA+ supports monotonic startup into a prebiased output - meaning it will not discharge the output capacitor when enabled. This is critical in multi-rail systems (e.g., FPGAs or processors with multiple power domains) where other rails may already be active. The MAX17640CATA+ achieves this via controlled gate drive sequencing and current-limit management, preventing bus contention or latch-up during power sequencing.
What is the purpose of the RESET pin on the MAX17640CATA+, and how is it used?
The RESET pin on the MAX17640CATA+ is an open-drain output that signals power-good status. It goes high-impedance when VOUT rises above 95% of regulation (after a 2ms delay) and pulls low when VOUT falls below 92%. This hysteresis prevents chatter during marginal conditions. Designers connect RESET to a pull-up resistor (e.g., 10kΩ to 3.3V) and route it to a microcontroller's reset or interrupt pin - eliminating need for external supervisor ICs in cost-sensitive industrial nodes.
Does the MAX17640CATA+ require external compensation components, and what capacitors are recommended?
No, the MAX17640CATA+ features fully internal compensation - no external RC network is needed. Recommended capacitors include: 1µF X7R ceramic for CIN (between VIN and GND), 1µF for CVCC (between VCC and GND), and ≥22µF X5R/X7R ceramic for COUT (between VOUT and GND). All-ceramic design enables ultra-compact layout and eliminates electrolytic aging concerns in long-life industrial deployments.
MAX17640CATA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 8-WFDFN
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 53.4V
- Current - Output:
- 400mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x2)
MAX17640CATA+ FAQ
1.How can I place an order for MAX17640CATA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17640CATA+ 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 MAX17640CATA+ reliable?
The price and inventory of MAX17640CATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17640CATA+ is usually 5 days.
3.What payment methods are accepted for MAX17640CATA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17640CATA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17640CATA+?
MAX17640CATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17640CATA+ 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 MAX17640CATA+?
For technical support, including MAX17640CATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17640CATA+ requirements.
6.How does Aetrix verify that MAX17640CATA+ is sourced from the original manufacturer or authorized distributors?
All MAX17640CATA+ 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 MAX17640CATA+ meets industry standards.
7.What is the process for return or replacement of MAX17640CATA+?
All MAX17640CATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17640CATA+, 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 MAX17640CATA+ part is unused and in its original packaging.
Return procedure for MAX17640CATA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX17640CATA+ 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…
