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Analog Devices Inc./Maxim Integrated MAX1672EEE+T
- Part No.:
- MAX1672EEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1672EEE+T.pdf
- Description:
- IC REG BUCK BST ADJ 300MA 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,137
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Product details
Overview
MAX1672EEE+T 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 with VIN ≥2.5V, achieves 85% typical efficiency, and features load disconnect in shutdown. It is used in single-cell Li-ion and multi-cell alkaline portable devices requiring stable low-noise rail generation.
For engineers reviewing the MAX1672EEE+T datasheet, MAX1672EEE+T pinout, MAX1672EEE+T application, or MAX1672EEE+T equivalent, key selection criteria include its hybrid buck-boost topology, dual-mode operation (step-up only / low-dropout step-down / full LDO), programmable current limit (0.5A/0.8A), integrated low-battery comparator (PGI/PGO), and thermal/short-circuit protection - all critical for battery-powered handheld equipment design.
Technical Context
The MAX1672EEE+T implements a pulse-frequency-modulated (PFM) boost stage with fixed 1µs off-time and variable on-time, driving an internal N-channel MOSFET, while sharing a precision 1.25V reference with a P-channel LDO stage. Its automatic mode switching-between pure boost (VIN < VOUT), low-dropout boost-assisted regulation (VIN slightly > VOUT), and pure LDO (VIN significantly > VOUT)-enables seamless voltage conversion across wide input ranges without external control logic.
This architecture eliminates need for external FETs or diodes, uses a single small inductor (e.g., 10µH), and leverages the LDO stage to filter boost ripple. The device derives internal power from the PS node (stepped-up voltage), starts from as low as 0.9V input, and provides active output disconnect and 0.1µA shutdown current - essential for ultra-low-power battery systems.
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/AAA 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 flexible system rail tuning. |
| Max Output Current | 300mA at 5V with VIN ≥2.5V - sufficient for microcontrollers, sensors, and RF modules in portable instrumentation. |
| Efficiency | 85% typical at 100mA load - reduces thermal load and extends battery life versus discrete solutions or less-optimized converters. |
| Quiescent Current | 85µA no-load, 0.1µA in shutdown - minimizes standby drain in always-on or wake-on-event applications. |
| Protection Features | Thermal shutdown (150°C), short-circuit protection, and overcurrent limiting (0.5A/0.8A selectable) - ensures robust operation under fault conditions without external circuitry. |
| Low-Battery Detection | Integrated PGI/PGO comparator with 1.25V threshold and 30mV hysteresis - enables host MCU to monitor battery health using one analog input and one GPIO. |
Pinout & Package
MAX1672EEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm), pin-compatible with standard 8-pin SO footprints but offering expanded functionality via dual LX pins and dedicated control/monitoring terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX (Pins 1, 16) | Inductor connection to internal N-MOSFET drain | Dual high-current switching nodes - require low-inductance layout; connect to 10µH inductor and Schottky diode anode. |
| PS (Pin 11) | Boosted supply output and LDO source | Internal power rail (~VOUT + 1V headroom); powers IC core and serves as PFET source - must be bypassed with 100µF low-ESR capacitor. |
| OUT (Pin 9) | Regulated output (drain of internal PFET) | Final system rail; requires 4.7µF ceramic/tantalum bypass to GND for LDO stability and ripple suppression. |
| FB (Pin 10) | Feedback input for adjustable output | Connect to GND for fixed 3.3V/5V; for adjustable mode, tie to resistor divider - sets VOUT = 1.25V × (1 + R1/R2). |
| 3/5 (Pin 5) | Output voltage selection | Logic input: tie to PS for 3.3V, GND for 5V - overridden if FB > 70mV (enables priority for resistor-programmed outputs). |
| ILIM (Pin 8) | Peak inductor current limit select | Set to GND for 0.5A limit (smaller inductor, lower ripple), PS for 0.8A limit (higher output capability). |
| ONA/ONB (Pins 3, 4) | Complementary enable control | Active-high ONA or active-low ONB turns device on; both high/low per Table 1 defines state - supports pushbutton or MCU-controlled sequencing. |
| PGI/PGO (Pins 6, 7) | Low-battery comparator input/output | PGI senses battery voltage via external divider; PGO is open-drain output pulled high externally - signals low-battery condition to host. |
Key Features
| Feature | Design Value |
|---|---|
| Hybrid step-up/down topology | Eliminates need for separate boost + LDO ICs; maintains regulation when VIN crosses VOUT - simplifies BOM and PCB area. |
| Single small inductor (10µH typical) | Reduces solution size vs. SEPIC/flyback; enabled by PFM control and shared reference - cuts component count and EMI sources. |
| Load disconnect in shutdown | OUT actively pulled to GND and isolated from IN - prevents battery drain through downstream loads during sleep. |
| Programmable current limit (0.5A/0.8A) | Allows optimization of inductor size, cost, and ripple based on actual load requirements - avoids overdesign. |
| Integrated low-battery detection | Removes need for external comparator and reference - saves board space and calibration effort in portable battery systems. |
| Thermal and short-circuit protection | Self-limiting behavior under overload prevents damage without external foldback circuitry - improves field reliability. |
Applications
| Digital Cameras | Hand-Held Test Equipment |
|---|---|
Use Scenario: Powering image sensor, DSP, and LCD backlight from a single 3.7V Li-ion cell across varying discharge profiles (3.0V–4.2V). IC Role / Device Role / Timing Role: Step-up/down DC-DC converter providing stable 3.3V rail regardless of battery voltage sag during flash operation or video capture. Use Value: Maintains clean, low-ripple 3.3V supply during high-current bursts, preventing sensor noise or display artifacts without requiring oversized batteries or dual-rail designs. |
Use Scenario: Supplying 5V to analog front-end and microcontroller in portable multimeters powered by 4×AA alkaline cells (4.8V–6.0V fresh, down to 3.2V depleted). IC Role / Device Role / Timing Role: Hybrid regulator operating in LDO mode at high VIN, transitioning seamlessly to boost mode as battery depletes - ensuring uninterrupted measurement accuracy. Use Value: Extends usable battery life by >30% compared to fixed LDO solutions, while eliminating brownouts during low-VIN operation. |
| Wireless Sensor Nodes | Medical Wearables |
Use Scenario: Generating 3.3V for BLE SoC and environmental sensors from a 3.6V primary lithium coin cell (BR2032) with 2.0V–3.6V operating range. IC Role / Device Role / Timing Role: Ultra-low-quiescent converter enabling multi-year operation; shutdown current of 0.1µA preserves battery during deep sleep cycles. Use Value: Reduces average system current to sub-µA levels - critical for energy-harvesting or long-life sealed devices where battery replacement is impractical. |
Use Scenario: Powering ECG analog signal chain and Bluetooth LE transceiver in a patch-style wearable using a 3.0V Li-SOCl₂ primary cell. IC Role / Device Role / Timing Role: Regulator with integrated PGI/PGO comparator monitoring cell voltage and triggering firmware alerts before end-of-life. Use Value: Enables predictive battery management and safe shutdown - meeting IEC 62304 safety requirements without adding discrete monitoring components. |
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 |
|---|---|---|---|
| MAX710ESA+ | Higher output current (500mA), wider input range (0.9V–6.5V), but no integrated low-battery detector or programmable current limit. | Targeted at higher-power portable systems where battery monitoring is handled externally; lacks PGI/PGO and ILIM flexibility. | Select MAX710ESA+ when >300mA continuous load is required and external battery monitoring is acceptable. |
| TPS63020DSJR | Buck-boost controller with 96% peak efficiency, 2.5V–5.5V input, 1.2V–5.5V adjustable output, but requires external MOSFETs and inductor. | Suitable for high-efficiency, high-current applications where board space allows discrete power stage; no integrated PFET or comparator. | Choose TPS63020DSJR for designs prioritizing peak efficiency >90% and willing to manage external FET layout and thermal design. |
Compared with MAX710ESA+, the MAX1672EEE+T offers tighter integration (integrated PFET, PGI/PGO, ILIM) at lower output current; versus TPS63020DSJR, it trades peak efficiency for full integration and ease of use in space-constrained, low-to-moderate power battery systems.
Availability
MAX1672EEE+T is available at Aetrix Electronics and suitable for digital cameras, hand-held test equipment, wireless sensor nodes, medical wearables, and portable instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for MAX1672EEE+T 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and consumer applications.
The MAX1672EEE+T belongs to Maxim's power management product line, designed specifically for compact, battery-efficient portable electronics that demand seamless voltage conversion across wide input ranges without external discrete components.
FAQ
What is the minimum input voltage required for MAX1672EEE+T to start up?
The MAX1672EEE+T can start up from as low as 0.9V input under typical conditions. This ultra-low startup voltage enables reliable operation with deeply discharged single-cell Li-ion or primary lithium batteries. Startup behavior is verified across temperature and load conditions per the datasheet's Typical Operating Characteristics section, and the internal bootstrap circuit ensures stable PS rail generation even at sub-1V input.
Does MAX1672EEE+T support adjustable output voltages, and how is it configured?
Yes, MAX1672EEE+T supports adjustable output from 1.25V to 5.5V using an external resistor divider connected between OUT and FB pins. The formula is R1 = R2 × (VOUT / 1.25V − 1), with R2 typically 100kΩ–270kΩ. When using this configuration, the 3/5 pin must be tied to GND, and FB voltage must exceed 70mV to override the fixed-output mode - all confirmed in the Design Procedure section of the MAX1672EEE+T datasheet.
How does the MAX1672EEE+T handle transitions between step-up and step-down modes?
The MAX1672EEE+T automatically transitions between step-up-only, low-dropout step-down (with boost assist), and pure LDO modes based on real-time comparison of VIN and VOUT at the IN pin. These transitions are internally managed with stable control loop behavior - visible as minor DC level shifts or ripple changes but no dropout or reset events. Mode switching is fully documented in the Detailed Description section and validated across temperature and load in Typical Operating Characteristics graphs.
What is the purpose of the dual LX pins (Pins 1 and 16) on the MAX1672EEE+T?
The dual LX pins (Pins 1 and 16) on the MAX1672EEE+T are electrically connected internally and serve as parallel high-current switching nodes for the internal N-channel MOSFET. This dual-pin layout reduces effective bond wire inductance and thermal resistance, improving efficiency and thermal performance under high peak currents. Layout guidelines recommend connecting both pins directly to the inductor with minimal trace length and width - a detail specified in the Layout Considerations section of the MAX1672EEE+T datasheet.
Can the MAX1672EEE+T be used without the PGI/PGO low-battery detection feature?
Yes, the MAX1672EEE+T can be used without PGI/PGO functionality by connecting both PGI and PGO pins directly to GND. This disables the comparator and eliminates associated bias current, simplifying the design when battery monitoring is handled externally or not required. The rest of the MAX1672EEE+T's regulation, protection, and control functions remain fully operational - a configuration explicitly supported in the Applications Information section.
MAX1672EEE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1672EEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1672EEE+T 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+T reliable?
The price and inventory of MAX1672EEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1672EEE+T is usually 5 days.
3.What payment methods are accepted for MAX1672EEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1672EEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1672EEE+T?
MAX1672EEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1672EEE+T 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+T?
For technical support, including MAX1672EEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1672EEE+T requirements.
6.How does Aetrix verify that MAX1672EEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1672EEE+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX1672EEE+T?
All MAX1672EEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1672EEE+T, 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+T part is unused and in its original packaging.
Return procedure for MAX1672EEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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