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Analog Devices Inc./Maxim Integrated MAX17532ATB+
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- Part No.:
- MAX17532ATB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17532ATB+.pdf
- Description:
- IC REG BUCK ADJ 100MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,228
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Product details
Overview
MAX17532ATB+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated pMOS/nMOS FETs, operating from 4V to 42V input and delivering up to 100mA at adjustable output voltages from 0.8V to 0.9×VIN. It features peak-current-mode control, ±1.75% FB voltage accuracy over –40°C to +125°C, and 22µA no-load quiescent current-enabling ultra-low-power industrial sensor and battery-powered applications.
For engineers reviewing the MAX17532ATB+ datasheet, MAX17532ATB+ pinout, MAX17532ATB+ application, or MAX17532ATB+ equivalent, key selection considerations include its 10-pin TDFN (3mm × 2mm) package, programmable 100kHz–2.2MHz switching frequency via RT/SYNC resistor, PFM/PWM mode selection via MODE pin, and built-in RESET output with 92–95% VFB threshold hysteresis.
Technical Context
The MAX17532ATB+ implements an internally compensated peak-current-mode control architecture with slope compensation, where the error amplifier compares FB voltage against a 0.8V reference and modulates high-side pMOS on-time based on sensed inductor current plus ramp compensation. Its adaptive loop compensation automatically adjusts for output voltage setting and external component variations.
It supports dual operating modes: forced-PWM (MODE = GND) for fixed-frequency operation with negative inductor current capability, and PFM (MODE unconnected) for pulse-skipping and zero-negative-current operation-delivering >90% peak efficiency and enhanced light-load efficiency down to 22µA IQ. Internal protection includes cycle-by-cycle peak current limit (210mA typ), hiccup-mode short-circuit response, thermal shutdown at +160°C, and monotonic startup into prebiased outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 42V - enables direct regulation from 12V/24V/36V industrial rails and automotive battery systems without pre-regulation. |
| Output Current | Up to 100mA - sufficient for powering microcontrollers, sensors, and analog front-ends in space-constrained systems. |
| Feedback Accuracy | ±1.75% over –40°C to +125°C - ensures stable output regulation across full industrial temperature range without external trimming. |
| Quiescent Current | 22µA in PFM no-load mode - extends battery life in always-on IoT and remote monitoring devices. |
| Switching Frequency | 100kHz to 2.2MHz, resistor-programmable via RT/SYNC - allows EMI optimization and inductor size reduction while supporting external synchronization in PWM mode. |
| Protection Features | Peak current limit (210mA), thermal shutdown (+160°C), RESET output with 2ms delay, and monotonic prebias startup - eliminates need for external fault-handling circuitry. |
| Package | 10-pin TDFN (3mm × 2mm, EP exposed pad) - provides low thermal resistance (θJA = 67.3°C/W) and compact footprint for high-density PCB layouts. |
Pinout & Package
MAX17532ATB+ is supplied in a 10-pin, 3mm × 2mm TDFN package with exposed thermal pad (EP), optimized for thermal performance on four-layer PCBs (θJA = 67.3°C/W). The EP must be soldered to GND for optimal power dissipation and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply rail | Bypassed with 1µF X7R ceramic capacitor; accepts 4V–42V unregulated input with robust UVLO and shutdown control. |
| 2 EN/UVLO | Enable / input undervoltage lockout | Programmable rising/falling thresholds (1.25V/1.15V typ); drives device into <1.2µA shutdown when pulled low. |
| 3 RT/SYNC | Oscillator timing / external sync input | Resistor sets fSW (100kHz–2.2MHz); accepts external clock (1.1×fSW max) only in PWM mode for system-level timing alignment. |
| 4 SS | Soft-start control | Internal 5.1ms soft-start when open; external capacitor enables monotonic ramp-up into prebiased loads. |
| 5 FB | Output voltage feedback | Connects to resistor divider; regulates output with ±1.75% accuracy; triggers RESET when deviating beyond 92–95% of setpoint. |
| 6 VOUT | External bias supply input | Powered from output rail (3.3V–5V) via 22.1Ω resistor + 0.22µF decoupling to reduce IN current and improve efficiency. |
| 7 RESET | Open-drain power-good monitor | Pulls low if FB drops below 92% of target; goes high-Z after 2ms delay when FB rises above 95% - enables system reset sequencing. |
| 8 MODE | PFM/PWM mode select | GND = forced-PWM (fixed frequency); open = automatic PFM at light load (22µA IQ, pulse skipping). |
| 9 GND | Power and signal ground | Common return for all internal blocks; EP must be connected to this node for thermal and EMI integrity. |
| 10 LX | Switch node | Drives external inductor; high-impedance during shutdown; requires low-inductance layout to minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side pMOS and low-side nMOS | Eliminates external MOSFETs and gate drivers; RDS-ONH = 2.7Ω (typ), RDS-ONL = 1.4Ω (typ) enable high efficiency at 100mA load. |
| Internal compensation | Supports any output voltage (0.8V–0.9×VIN) without external compensation components - reduces BOM count and design iteration time. |
| All-ceramic capacitor support | Enables compact, low-profile designs using only X7R MLCCs for CIN (1µF) and COUT (10µF), eliminating electrolytic or tantalum parts. |
| Programmable EN/UVLO threshold | Adjustable turn-on/off voltage via resistor divider on EN/UVLO pin - allows custom brown-out protection aligned with system-level power sequencing. |
| Prebias-safe monotonic startup | Prevents reverse current flow during startup into existing output voltage - critical for hot-swap and redundant power systems. |
| Hiccup-mode short-circuit protection | Automatically cycles on/off during sustained overload (51ms timeout) - protects IC and external components without latch-up or manual reset. |
Applications
| Industrial Sensor Node Power | High-Voltage LDO Replacement |
|---|---|
|
Use Scenario: Powering 3.3V or 5V analog sensor front-ends (e.g., pressure, temperature, current shunt amplifiers) in 24V factory automation systems. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V rail to stable 3.3V/5V with <22µA quiescent draw and ±1.75% output accuracy across –40°C to +125°C. Use Value: Replaces inefficient linear regulators, reducing thermal load by >70% and enabling sealed, fanless enclosures for harsh environments. |
Use Scenario: Replacing discrete 42V-input LDOs in HVAC control panels requiring 3.3V for microcontrollers and communication interfaces. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering 100mA at 3.3V with programmable UVLO and RESET signaling for system health monitoring. Use Value: Achieves >90% efficiency at full load versus <25% for LDOs, cutting board-level power dissipation from >1W to <150mW. |
| Battery-Powered Remote Monitor | HVAC Zone Controller Supply |
|
Use Scenario: Regulating 3.3V for LoRaWAN or NB-IoT transceivers and ARM Cortex-M0+ MCUs in solar-charged, long-life field sensors. IC Role / Device Role / Timing Role: Ultra-low-IQ (22µA) PFM-mode buck converter with soft-start and monotonic prebias startup for reliable cold-boot from depleted batteries. Use Value: Extends 2xAA alkaline battery life from 6 months to >5 years in sleep-dominated duty cycles (10s active per hour). |
Use Scenario: Providing regulated 5V supply to zone-specific thermostats, valve actuators, and RS-485 transceivers in commercial building management systems. IC Role / Device Role / Timing Role: Robust 42V-input buck converter with thermal shutdown, hiccup protection, and RESET output for fault-aware power domain isolation. Use Value: Enables single-board integration of multiple zone supplies without derating or external thermal management, reducing bill-of-materials by 40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36520RNXR | 65V input, 200mA output, 2.5µA IQ, 12-pin WSON; lacks RESET, MODE pin, and VOUT bias input. | Higher voltage/current rating but no integrated power-good or bias rail optimization - less suitable for precision 3.3V/5V sensor rails. | Select when input exceeds 42V or load exceeds 100mA; avoid when RESET signaling or ultra-low-light-load efficiency is required. |
| TPS63020DSJR | Buck-boost topology, 1.8V–5.5V input, 2A output, 30µA IQ; supports seamless VIN-to-VOUT crossover but no high-voltage capability. | Designed for single-cell Li-ion or USB-powered systems - incompatible with 24V/36V industrial inputs. | Choose only for battery-fed applications with variable input below 6V; not a functional substitute for MAX17532ATB+'s 4V–42V range. |
Compared with LMR36520RNXR and TPS63020DSJR, the MAX17532ATB+ uniquely combines 42V max input, 100mA output, 22µA PFM IQ, integrated RESET, and VOUT bias optimization - making it the only fit for space-constrained, high-reliability 3.3V/5V industrial sensor supplies requiring full-temperature accuracy and system-level fault reporting.
Availability
MAX17532ATB+ is available at Aetrix Electronics and suitable for industrial sensors and process control, battery-powered equipment, and HVAC and building control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17532ATB+ 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 high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets - emphasizing reliability, integration, and power efficiency.
The MAX17532ATB+ belongs to Maxim's ultra-small, high-voltage DC-DC converter product line, engineered specifically for space- and power-constrained industrial sensing, battery backup, and distributed control applications demanding wide input range and minimal external components.
FAQ
What is the maximum input voltage supported by the MAX17532ATB+?
The MAX17532ATB+ supports a maximum input voltage of 42V, with absolute maximum ratings extending to 48V on the IN pin. This allows direct connection to 24V and 36V industrial power rails, as well as automotive battery systems with transient spikes, without requiring external clamping or pre-regulation stages. Operation remains fully specified from 4V to 42V.
Does the MAX17532ATB+ require external compensation components?
No, the MAX17532ATB+ features internal compensation optimized for any output voltage from 0.8V to 0.9×VIN. This eliminates the need for external Type-II or Type-III compensation networks, simplifying design, reducing component count, and improving stability across varying output configurations - a key differentiator versus many competing buck controllers.
How does the MODE pin affect efficiency and operation of the MAX17532ATB+?
When MODE is left unconnected, the MAX17532ATB+ operates in PFM mode at light loads, achieving 22µA no-load quiescent current and skipping pulses to maintain high efficiency. When MODE is grounded, it forces fixed-frequency PWM operation - essential for EMI-sensitive or frequency-synchronized systems - though light-load efficiency decreases due to continuous switching.
Can the MAX17532ATB+ start up safely into a prebiased output voltage?
Yes, the MAX17532ATB+ supports monotonic startup into a prebiased output. During initial power-up, both high-side and low-side FETs remain off until the PWM comparator commands the first pulse, preventing reverse current flow and ensuring smooth, non-destructive ramp-up - a critical feature for hot-swap and redundant power architectures.
What is the function of the VOUT pin on the MAX17532ATB+?
The VOUT pin on the MAX17532ATB+ provides an external bias path for internal circuitry. When connected to the output rail (3.3V–5V) via a 22.1Ω resistor and 0.22µF capacitor, it reduces input supply current and improves overall efficiency. For output voltages outside that range, VOUT must be tied to GND to prevent damage or malfunction.
MAX17532ATB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 37.8V
- Current - Output:
- 100mA
- Frequency - Switching:
- 100kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x2)
MAX17532ATB+ FAQ
1.How can I place an order for MAX17532ATB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17532ATB+ 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 MAX17532ATB+ reliable?
The price and inventory of MAX17532ATB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17532ATB+ is usually 5 days.
3.What payment methods are accepted for MAX17532ATB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17532ATB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17532ATB+?
MAX17532ATB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17532ATB+ 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 MAX17532ATB+?
For technical support, including MAX17532ATB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17532ATB+ requirements.
6.How does Aetrix verify that MAX17532ATB+ is sourced from the original manufacturer or authorized distributors?
All MAX17532ATB+ 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 MAX17532ATB+ meets industry standards.
7.What is the process for return or replacement of MAX17532ATB+?
All MAX17532ATB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17532ATB+, 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 MAX17532ATB+ part is unused and in its original packaging.
Return procedure for MAX17532ATB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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