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Analog Devices Inc./Maxim Integrated MAX1672EEE+
- Part No.:
- MAX1672EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1672EEE+.pdf
- Description:
- IC REG BUCK BST ADJ 300MA 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,155
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Product details
Overview
MAX1672EEE+ from Maxim Integrated is a step-up/down DC-DC converter IC integrating a PFM-controlled boost switcher and a PFET linear regulator in a single 16-pin QSOP package. It delivers regulated 3.3V or 5V output (or adjustable 1.25V–5.5V) from 1.8V–11V input, supports up to 300mA at 5V (VIN ≥2.5V), achieves 85% typical efficiency, and features logic-controlled shutdown with 0.1µA quiescent current - ideal for single-cell Li-ion and multi-cell alkaline portable systems.
For engineers reviewing the MAX1672EEE+ datasheet, MAX1672EEE+ pinout, MAX1672EEE+ application, or MAX1672EEE+ equivalent, key selection considerations include its dual-mode regulation architecture, selectable 0.5A/0.8A inductor current limit, integrated low-battery comparator (PGI/PGO), thermal/short-circuit protection, and QSOP footprint compatibility with standard 8-pin SO layouts.
Technical Context
The MAX1672EEE+ employs a pulse-frequency-modulated (PFM) boost stage with fixed 1µs off-time and variable on-time, driving an internal N-channel MOSFET, while a precision 1.25V reference feeds both the boost error amplifier and the PFET linear regulator's error amp. Its automatic mode switching - step-up (VIN < VOUT), low-dropout step-down (VIN ≈ VOUT + 1V), and pure LDO (VIN >> VOUT) - is governed by real-time comparison of VIN and VOUT at the IN pin.
This hybrid topology enables ripple rejection via the linear stage, eliminates external FETs, and allows use of a compact 10µH inductor - half the energy storage requirement of SEPIC/flyback alternatives. The PS pin serves as both bootstrapped power supply output and PFET source, while PGND/GND separation supports high-current return path integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 11V - supports single Li-ion (2.7–4.2V), 2–4 AA alkaline (2.4–6.0V), and AC adapter inputs without pre-regulation. |
| Output Voltage | Preset 3.3V or 5V (via 3/5 pin), or adjustable 1.25V–5.5V (via FB resistor divider) - enables direct replacement of fixed-output regulators or custom rail generation. |
| Max Output Current | 300mA at 5V (VIN ≥2.5V); 150mA at 5V (VIN ≥1.8V) - defines usable load capacity under minimum input conditions. |
| Efficiency | 85% typical at 100mA load - reduces battery drain and thermal load in space-constrained portable designs. |
| Quiescent Current | 85µA (active), 0.1µA (shutdown) - extends shelf life and runtime in always-on or intermittently active systems. |
| Protection Features | Thermal shutdown (150°C), short-circuit protection, and load disconnect in shutdown - ensures robustness during fault conditions and battery depletion. |
| Low-Battery Detection | PGI threshold = 1.25V ±6mV, 30mV hysteresis, open-drain PGO output - enables system-level battery monitoring without external comparators. |
Pinout & Package
MAX1672EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), pin-compatible with industry-standard 8-pin SO footprints despite doubled pin count - enabling layout reuse and higher integration density.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 LX | Inductor connection to N-MOSFET drain | High-current switching node; requires short, low-inductance PCB trace to minimize EMI and voltage spikes. |
| 2, 15 PGND | Power ground | Dedicated high-current return path for LX and PS; must be separated from analog GND and tied at single point. |
| 3 ONB | Active-low enable control | Drives device ON when pulled low; used with ONA for pushbutton or microcontroller-controlled sequencing. |
| 4 ONA | Active-high enable control | Drives device ON when pulled high; complements ONB for flexible logic-level control (Table 1). |
| 5 3/5 | Output voltage select | Connect to PS for 3.3V, GND for 5V; overridden if FB >70mV - prevents conflict during adjustable-output configurations. |
| 6 PGI | Low-battery comparator input | Monitors battery voltage via resistor divider; triggers PGO when VPGI falls below 1.25V threshold. |
| 7 PGO | Open-drain low-battery output | Sinks current when battery is low; requires external pull-up (e.g., 1MΩ) for microcontroller interrupt or LED indication. |
| 8 ILIM | Inductor current limit select | GND = 0.5A limit (smaller inductor), PS = 0.8A limit (higher output current); sets peak switch current. |
| 9 OUT | Regulated output / PFET drain | Final regulated output node; bypassed with 4.7µF capacitor to ensure linear regulator stability and ripple suppression. |
| 10 FB | Feedback input | Connects to resistor divider for adjustable outputs; bias current ≤50nA allows high-value resistors without accuracy loss. |
| 11 PS | Bootstrapped power supply output | Stepped-up voltage source powering internal circuitry and PFET source; filtered with 100µF tantalum capacitor. |
| 12 IN | Input voltage sense | Direct connection to input supply; enables automatic mode switching between boost, low-dropout, and LDO operation. |
| 13 REF | 1.25V precision reference output | Bypassed with 0.1µF capacitor; shared reference for both boost and linear regulator error amplifiers. |
| 14 GND | Analog ground | Reference ground for REF, FB, PGI, and control logic; kept separate from PGND to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Step-up/down topology | Single IC replaces discrete boost + LDO solutions, reducing BOM count and board area while enabling seamless VIN-to-VOUT transitions. |
| Selectable 0.5A/0.8A current limit | Allows optimization of inductor size and cost: 0.5A supports 10µH/low-cost chokes for <150mA loads; 0.8A enables full 300mA capability. |
| Integrated low-battery comparator | Eliminates need for external voltage monitor IC or µC ADC sampling - PGO provides immediate, hardware-based battery alert. |
| Load disconnect in shutdown | OUT is actively pulled to GND and isolated from IN during shutdown - prevents battery drain through downstream circuitry. |
| Thermal and short-circuit protection | Auto-recovering shutdown at 150°C junction temperature with 20°C hysteresis - protects against sustained overload without latch-up. |
| No external FETs required | Internal N-MOSFET switch and PFET pass element reduce design complexity, eliminate gate-drive concerns, and improve reliability. |
Applications
| Handheld Medical Devices | Digital Cameras |
|---|---|
|
Use Scenario: Battery-powered glucose meters and portable pulse oximeters operating from single Li-ion or dual AA cells with strict low-noise, low-quiescent-current requirements. IC Role / Device Role / Timing Role: Primary power management IC providing stable 3.3V rail for MCU, sensor interface, and LCD backlight driver while maintaining <100µA system sleep current. Use Value: Enables >1-year shelf life and >500 measurements per charge via 0.1µA shutdown current and 85% light-load efficiency. |
Use Scenario: Compact digital still cameras using 2–4 AA alkaline batteries, requiring clean 3.3V for image sensor and 5V for flash charging circuitry. IC Role / Device Role / Timing Role: Dual-rail generator delivering regulated 3.3V and 5V from varying input (2.4–6.0V), with PGO signaling end-of-life battery to disable flash before critical voltage drop. Use Value: Eliminates need for separate boost and LDO ICs, reducing solution size by 40% and enabling use of smaller, lower-cost inductors. |
| Industrial Handheld Scanners | Portable Test Equipment |
|
Use Scenario: Rugged barcode scanners powered by removable NiMH or Li-ion packs, subject to wide temperature (-20°C to +60°C) and mechanical shock. IC Role / Device Role / Timing Role: Main DC-DC converter supplying 5V to laser diode driver and 3.3V to ARM Cortex-M MCU, with thermal shutdown preventing damage during extended scanning sessions. Use Value: Maintains regulation across full input range (1.8V–11V) and temperature, ensuring consistent scan performance even as battery discharges. |
Use Scenario: Battery-operated multimeters and signal generators requiring ultra-stable analog rails and minimal measurement drift. IC Role / Device Role / Timing Role: Low-noise power source where linear regulator stage filters boost ripple, delivering <10mVpp output noise at 100mA load for precision ADC references. Use Value: Achieves 60dB PSRR at 10kHz (per Figure MAX1672-09), enabling accurate 16-bit measurements without additional LDO post-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up/down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX710CPA+ | Higher output current (500mA), wider input range (0.9V–6.5V), but no integrated low-battery detector or adjustable output; uses external PFET. | Preferred for high-current, low-input-voltage systems (e.g., single NiCd) where PGI/PGO is unnecessary and board space allows external FET. | Select MAX710CPA+ only if >300mA output and sub-1.8V startup are required - MAX1672EEE+ offers superior integration and battery monitoring. |
| TPS63020DSJR | Buck-boost controller with 96% peak efficiency, 2A output, I²C programmability, but requires external MOSFETs, inductors, and capacitors; no integrated reference or PGI/PGO. | Suitable for high-efficiency, high-power portable systems (e.g., tablets) where programmability and thermal performance outweigh BOM simplicity. | Choose TPS63020DSJR for >500mA loads and firmware-configurable rails; MAX1672EEE+ remains optimal for cost-sensitive, low-to-mid current (<300mA) applications with minimal external components. |
Compared with MAX710CPA+ and TPS63020DSJR, the MAX1672EEE+ trades peak efficiency and current capability for unparalleled integration - embedding reference, comparator, PFET, and mode control in one 16-pin QSOP, minimizing external parts and validation effort for portable battery systems.
Availability
MAX1672EEE+ is available at Aetrix Electronics and suitable for handheld medical devices, digital cameras, industrial scanners, portable test equipment, and battery-powered IoT edge nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1672EEE+ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and portable applications.
The MAX1672EEE+ belongs to Maxim's Power Management product line, designed specifically for space-constrained, battery-powered systems needing seamless voltage conversion across wide input ranges without sacrificing regulation accuracy or protection integrity.
FAQ
What input voltage range does the MAX1672EEE+ support, and how does it handle operation below 2.0V?
The MAX1672EEE+ supports an input voltage range of 1.8V to 11V and can start up from as low as 0.9V. Below 2.0V, it operates exclusively in step-up mode, delivering regulated 3.3V or 5V output using its internal N-MOSFET and 10µH inductor. The device maintains regulation down to 1.8V input at reduced output current (150mA at 5V), making it suitable for deeply discharged alkaline or Li-ion cells. This behavior is confirmed in the Typical Operating Characteristics graphs (MAX1672-04 and MAX1672-05) and Electrical Characteristics table.
How does the MAX1672EEE+ implement automatic step-up/step-down mode switching, and what pins control it?
The MAX1672EEE+ automatically switches between step-up, low-dropout step-down, and pure LDO modes based on real-time comparison of VIN and VOUT at the IN pin - no external control is needed. When VIN < VOUT, only the boost stage operates; when VIN is slightly above VOUT (~1V headroom), both boost and linear stages are active to maintain regulation and reject ripple; when VIN is significantly higher, only the linear regulator conducts. This seamless transition is intrinsic to the IC's architecture and requires no configuration - the IN pin must be directly connected to the input supply for correct operation.
Can the MAX1672EEE+ generate an adjustable output voltage, and what is the supported range?
Yes, the MAX1672EEE+ supports adjustable output voltages from 1.25V to 5.5V using a resistor divider network connected between OUT and FB pins. The internal 1.25V reference (REF pin) and low FB input bias current (≤50nA) allow high-value resistors (e.g., R2 = 200kΩ) without accuracy degradation. To configure adjustable output, connect the 3/5 pin to GND and calculate R1 using R1 = R2[(VOUT / 1.25V) – 1]. This capability is explicitly detailed in the "Output Voltage Selection" section of the datasheet and validated across temperature (–40°C to +85°C).
What is the function of the PGI and PGO pins on the MAX1672EEE+, and how is the threshold set?
The PGI pin is the low-battery comparator input with a precise 1.25V threshold (±6mV), and PGO is its open-drain output that pulls low when VPGI exceeds 1.25V. Threshold setting uses an external resistor divider (R3/R4) from input to GND, calculated as R3 = R4[(VPGT / 1.25V) – 1], where VPGT is the desired trip point. Hysteresis is fixed at ~30mV. This feature is fully integrated - no external comparator or reference is needed - and is confirmed in the Electrical Characteristics table and Applications Information section.
Does the MAX1672EEE+ require external MOSFETs, and what protection features are built-in?
No, the MAX1672EEE+ requires no external MOSFETs: it integrates an internal N-channel power MOSFET for the boost stage and a P-channel MOSFET as the linear regulator pass element. Built-in protections include thermal shutdown (150°C trigger, 20°C hysteresis), short-circuit protection, overcurrent limiting (selectable 0.5A/0.8A via ILIM), and load disconnect during shutdown. These functions are documented in the Features list, Absolute Maximum Ratings, and Detailed Description sections, and do not rely on external components.
MAX1672EEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 1.25V (3.3V, 5.5V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 300mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX1672EEE+ FAQ
1.How can I place an order for MAX1672EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1672EEE+ 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 MAX1672EEE+ reliable?
The price and inventory of MAX1672EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1672EEE+ is usually 5 days.
3.What payment methods are accepted for MAX1672EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1672EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1672EEE+?
MAX1672EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1672EEE+ 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 MAX1672EEE+?
For technical support, including MAX1672EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1672EEE+ requirements.
6.How does Aetrix verify that MAX1672EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1672EEE+ 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 MAX1672EEE+ meets industry standards.
7.What is the process for return or replacement of MAX1672EEE+?
All MAX1672EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1672EEE+, 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 MAX1672EEE+ part is unused and in its original packaging.
Return procedure for MAX1672EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1672EEE+ Tags
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