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Analog Devices Inc./Maxim Integrated MAX17670EATB+
- Part No.:
- MAX17670EATB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17670EATB+.pdf
- Description:
- IC REG BUCK 3.3V 150MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,307
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Product details
Overview
MAX17670EATB+ from Maxim Integrated is a dual-output Himalaya-series power management IC integrating a 4V–60V, 150mA synchronous step-down DC-DC converter with fixed 3.3V output and a high-PSRR, low-noise 50mA linear regulator. It features ±1.3% linear-regulator accuracy over –40°C to +125°C, 200kHz–2.2MHz adjustable switching frequency, and operates in industrial environments up to +125°C ambient. Used in battery-powered equipment and HVAC control systems requiring compact, high-efficiency dual-rail supplies.
For engineers reviewing the MAX17670EATB+ datasheet, MAX17670EATB+ pinout, MAX17670EATB+ application, or MAX17670EATB+ equivalent, key selection criteria include its 3.3V fixed buck output, integrated LDO with 2.35V–5.5V input range, EN/UVLO programmability, RESET monitoring of both outputs, and TDFN-10 (3mm × 3mm) package for space-constrained designs.
Technical Context
The MAX17670EATB+ implements a current-mode synchronous buck controller with internal high-side pMOS (RDS(on) = 2.7Ω typ.) and low-side nMOS (RDS(on) = 1.33Ω typ.), enabling up to 98% duty-cycle operation and PFM/PWM mode auto-selection. Its linear regulator uses a PMOS pass device with dropout voltage as low as 200mV at 50mA load and supports monotonic startup into prebiased outputs.
Feedback regulation is split: FBBUCK senses the buck output (3.3V nominal, ±2% accuracy), while OUTL is monitored independently for RESET assertion; both thresholds are referenced to their respective regulation voltages (e.g., FBBUCK falling below 92% triggers RESET). The MODE/SYNC pin enables external clock synchronization or PFM/PWM mode selection without layout changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Step-down Input Range | 4V to 60V - supports wide-input industrial and battery-derived rails without external pre-regulation. |
| Buck Output Voltage | Fixed 3.3V ±2% - eliminates external feedback resistors and simplifies layout for stable 3.3V logic supply. |
| LDO Output Current | 50mA max - sufficient for powering low-power sensors, ADC references, or MCU I/O rails with low noise. |
| Quiescent Current | 70μA (PFM mode) - enables >1-year battery life in always-on sensor nodes with light loads. |
| Operating Temp Range | –40°C to +125°C ambient - qualified for under-hood automotive, industrial PLC, and outdoor HVAC applications. |
| Shutdown Current | 2.5μA - ensures minimal leakage during system sleep states, critical for energy harvesting designs. |
| Switching Frequency | 200kHz to 2.2MHz - allows EMI optimization via RT resistor or synchronization to system clock to avoid band interference. |
Pinout & Package
MAX17670EATB+ is housed in a 10-pin, 3mm × 3mm, 0.5mm-pitch TDFN package (package code T1033+1C) with exposed pad (EP) for thermal dissipation. Pin 1 is marked by a dot; EP must be soldered to PCB ground plane for θJA = 41°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Step-down converter input | Accepts 4V–60V unregulated supply; requires local 1μF X7R ceramic decoupling to GND. |
| 2 EN/UVLO | Enable and input UVLO control | Resistor-divider programmable turn-on threshold (1.19–1.24V); pull low to disable entire IC. |
| 3 RT | Switching frequency programming | Connect resistor to GND to set fSW from 200kHz–2.2MHz; open for default 600kHz. |
| 4 FBBUCK | Buck output feedback | Direct connection to VOUT for MAX17670; monitors 3.3V regulation and triggers RESET if <92%. |
| 5 OUTL | LDO output | Delivers regulated 3.3V/3.0V/2.5V/1.8V/1.5V/1.2V (configurable per ordering option); requires ≥2.2μF ceramic cap. |
| 6 INL | LDO input / bootstrap bias | Accepts 2.35V–5.5V input; auto-switches to buck output when ≥3.3V, improving efficiency and reducing external components. |
| 7 RESET | Open-drain fault indicator | Asserts low if FBBUCK or OUTL drops <92% of target or EN/UVLO falls below threshold; 2.1ms delay on release. |
| 8 MODE/SYNC | Mode control & clock sync | Ground for PFM mode; float or drive with external clock (1.1×–1.4× fSW) for synchronized PWM operation. |
| 9 LX | Switch node | Connects to external inductor; high dv/dt node requiring tight layout and minimized trace length. |
| 10 GND | Power and signal reference | Common return for all circuits; must be connected to EP for optimal thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck + LDO Integration | Eliminates need for separate buck and LDO ICs, reducing BOM count, board area, and design validation effort. |
| All-Ceramic Capacitor Support | Enables use of small, reliable MLCCs instead of electrolytics-improving lifetime and temperature stability. |
| Inductive Short Protection | Detects and limits current during inductor short-circuit events, preventing damage to internal MOSFETs. |
| Monotonic Startup into Prebiased Load | Ensures clean power-up sequence without output voltage overshoot when OUTL is already biased-critical for FPGA and ASIC sequencing. |
| High PSRR Linear Regulator | Delivers >60dB PSRR at 100Hz and >40dB at 1MHz (50mA load), suppressing ripple from buck stage for sensitive analog circuits. |
| Resistor-Programmable EN/UVLO | Allows precise system-level brown-out detection (e.g., 12V system turns on at 10.5V) without additional supervisor IC. |
Applications
| Industrial Sensor Node | Battery-Powered Data Logger |
|---|---|
|
Use Scenario: Remote temperature/humidity sensor operating on two AA cells (2.4V–3.2V) with 4–20mA loop interface and BLE radio. IC Role / Device Role / Timing Role: MAX17670EATB+ provides 3.3V rail for microcontroller and radio, and 3.0V rail for precision ADC reference-all from single-cell-compatible input via buck boost (using external charge pump) or direct 3.3V LDO path. Use Value: Ultra-low 70μA quiescent current extends battery life beyond 2 years; RESET output enables firmware-initiated reboots on supply sag. |
Use Scenario: Portable environmental monitor logging data every 5 minutes using Li-SOCl₂ primary battery (3.6V nominal, up to 3.9V). IC Role / Device Role / Timing Role: Acts as main power conditioner: buck converts battery to stable 3.3V for MCU and flash memory; LDO delivers ultra-low-noise 2.5V for 16-bit SAR ADC. Use Value: High PSRR (>60dB @ 100Hz) prevents switching noise from corrupting ADC measurements; 2.5μA shutdown current minimizes self-discharge. |
| HVAC Zone Controller | Building Automation Gateway |
|
Use Scenario: DIN-rail mounted thermostat controlling valve actuators and communicating via RS-485 over 24V AC/DC supply. IC Role / Device Role / Timing Role: Accepts 24V input directly; buck generates 3.3V for ARM Cortex-M4 host; LDO supplies isolated 5V for RS-485 transceiver via external transformer driver. Use Value: 60V absolute max input withstands 24V supply transients (e.g., inductive kick from relay coils); -40°C to +125°C rating ensures reliability in unconditioned mechanical rooms. |
Use Scenario: Edge gateway aggregating Modbus RTU data from 10+ field devices, powered from 48V PoE++ or building DC bus. IC Role / Device Role / Timing Role: Primary power manager: buck regulates 48V to 3.3V for SoC and Ethernet PHY; LDO supplies 1.8V for DDR3L memory interface with tight noise margin. Use Value: Adjustable switching frequency avoids 48V bus harmonics; RESET output feeds watchdog timer to detect undervoltage-induced firmware hangs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17671EATB+ | Fixed 5V buck output (vs. 3.3V); identical LDO options, pinout, and feature set. | Preferred where system requires 5V logic rail (e.g., legacy UART peripherals, optocouplers) instead of 3.3V. | Select MAX17671EATB+ only if 5V buck output is required; otherwise MAX17670EATB+ offers better efficiency at 3.3V loads due to lower dropout and reduced conduction loss. |
| TPS63020DSJR | Buck-boost topology (2.5V–6V input, 1.2V–5.5V output); no integrated LDO; 2A output capability. | Suitable for single-output, wide-input-voltage applications where input may dip below 4V (e.g., 3.3V Li-ion systems). | Choose TPS63020DSJR only when input voltage can fall below 4V or higher output current (>150mA) is needed; lacks dual-rail integration and RESET monitoring of both rails. |
Compared with MAX17671EATB+, the MAX17670EATB+ delivers superior efficiency at 3.3V loads and matches all protection, thermal, and timing features. Against TPS63020DSJR, it trades buck-boost flexibility for tighter regulation, integrated LDO, and comprehensive fault monitoring-making it ideal for fixed-input, dual-rail industrial systems.
Availability
MAX17670EATB+ is available at Aetrix Electronics and suitable for industrial sensors and process control, HVAC and building control, and battery-powered equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX17670EATB+ 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 thermal robustness.
The Himalaya series-including MAX17670EATB+-was engineered specifically for compact, high-efficiency power conversion in harsh environments, targeting applications where size, thermal performance, and long-term supply stability are critical.
FAQ
What is the fixed output voltage of the step-down converter in MAX17670EATB+?
The MAX17670EATB+ integrates a fixed-output synchronous step-down converter delivering 3.3V ±2% over temperature and line. This is confirmed in the General Description and Electrical Characteristics tables, where FBBUCK regulation voltage is specified as 3.216V–3.365V (typ. 3.3V) for MAX17670 with MODE/SYNC grounded. No external feedback resistors are required.
Can MAX17670EATB+ operate with an input voltage below 4V?
No. The MAX17670EATB+ has a minimum input voltage of 4V for the step-down converter, as stated in Absolute Maximum Ratings and Electrical Characteristics. Operation below 4V will prevent regulation; the EN/UVLO threshold (1.19–1.24V) refers to the enable pin voltage-not the input rail-and does not override the 4V functional minimum.
Does MAX17670EATB+ support external clock synchronization?
Yes. The MODE/SYNC pin of MAX17670EATB+ accepts an external clock signal between 1.1× and 1.4× the programmed switching frequency (e.g., 660kHz–840kHz for default 600kHz). This is documented in the Electrical Characteristics table under "SYNC Input Frequency" and enables deterministic EMI reduction in synchronized multi-rail systems.
What is the maximum load current supported by the linear regulator in MAX17670EATB+?
The linear regulator in MAX17670EATB+ supports up to 50mA continuous output current, as specified in the General Description and Electrical Characteristics (ILDO_LIM = 55–84mA, with VOUTL held at 70% of nominal). At full 50mA load, dropout voltage remains ≤400mV (typ. 200mV), ensuring stable operation with adequate headroom.
How does the RESET function monitor both power rails in MAX17670EATB+?
The RESET output of MAX17670EATB+ asserts low if either FBBUCK falls below 92% of its regulation voltage (e.g., <3.036V for 3.3V output) OR OUTL drops below 92% of its nominal value (e.g., <2.76V for 3.0V option), as defined in the Electrical Characteristics table. RESET releases after both rails exceed 95% and remain stable for 2.1ms, provided INL is above its UVLO threshold.
MAX17670EATB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN 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):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 150mA
- Frequency - Switching:
- 610kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
MAX17670EATB+ FAQ
1.How can I place an order for MAX17670EATB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17670EATB+ 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 MAX17670EATB+ reliable?
The price and inventory of MAX17670EATB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17670EATB+ is usually 5 days.
3.What payment methods are accepted for MAX17670EATB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17670EATB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17670EATB+?
MAX17670EATB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17670EATB+ 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 MAX17670EATB+?
For technical support, including MAX17670EATB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17670EATB+ requirements.
6.How does Aetrix verify that MAX17670EATB+ is sourced from the original manufacturer or authorized distributors?
All MAX17670EATB+ 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 MAX17670EATB+ meets industry standards.
7.What is the process for return or replacement of MAX17670EATB+?
All MAX17670EATB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17670EATB+, 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 MAX17670EATB+ part is unused and in its original packaging.
Return procedure for MAX17670EATB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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