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Analog Devices Inc./Maxim Integrated MAX1972EEE
- Part No.:
- MAX1972EEE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1972EEE.pdf
- Description:
- IC REG BUCK ADJ 750MA DL 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,259
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Product details
Overview
MAX1972EEE from Maxim Integrated is a dual-output, current-mode PWM buck regulator IC operating at a fixed 1.4MHz switching frequency, delivering up to 750mA per output from a 2.6V–5.5V input. It features 180° out-of-phase operation to reduce input ripple, ±1% output voltage accuracy over load/line/temperature, and integrated power-on reset (POR) with 175ms delay. It is used in USB-powered xDSL modems for compact, efficient dual-rail power conversion.
For engineers reviewing the MAX1972EEE datasheet, MAX1972EEE pinout, MAX1972EEE application, or MAX1972EEE equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with functional distinctions, and supply-ready availability details - all specific to the MAX1972EEE variant.
Technical Context
The MAX1972EEE integrates two synchronous step-down regulators sharing a single 1.4MHz oscillator, with internal high-side and low-side MOSFETs (RDS(ON) ≤ 0.32Ω / 0.25Ω at VIN = 3.3V) and current-sense transresistance of 0.5V/A. Its current-mode control uses slope compensation and an integrated 1.2V reference to achieve stable regulation across 1.2V–VIN output ranges.
It implements 180° phase interleaving between LX1 and LX2 outputs to halve input capacitor RMS current, supports all-ceramic capacitor designs, and includes dedicated FBSEL pins to configure preset outputs (1.8V/3.3V on OUT1; 1.5V/2.5V on OUT2) or external resistor-divider programming. The open-drain PFO monitors VCC and asserts high below 3.94V for USB power-fail detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 1.4MHz - enables use of small 3.3µH–6.8µH inductors and 10µF ceramic input capacitors, avoiding bulk electrolytics. |
| Output Current (per channel) | 750mA guaranteed - sufficient to replace dual LDOs in xDSL modem core/I/O rails without thermal derating at +85°C. |
| Input Voltage Range | 2.6V to 5.5V - compatible with single-cell Li-ion, USB 5V, and regulated 3.3V system supplies. |
| Output Voltage Accuracy | ±1% over load, line, and temperature - ensures reliable DDR I/O or PHY biasing without post-regulation trimming. |
| POR Delay Time | 175ms - provides deterministic system reset timing after both outputs reach 92% regulation, matching USB host enumeration windows. |
| PFO Trip Threshold | 3.94V (falling) - detects USB bus collapse before VIN drops below 4.0V, enabling graceful shutdown in powered devices. |
| Efficiency (typ.) | 88% at 500mA, VIN=5V, VOUT1=3.3V/VOUT2=2.5V - reduces thermal load in sealed SFP modules versus discrete solutions. |
Pinout & Package
MAX1972EEE is housed in a 16-pin QSOP package (5.0mm × 6.2mm, 0.65mm pitch), thermally optimized for PCB copper pour on PGND and exposed pad (not electrically connected in QSOP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LX1 | High-side switch node 1 | Connects to inductor for OUT1; carries pulsed current up to 1.2A peak; requires tight layout to minimize EMI and ringing. |
| 2 VCC | Analog supply | Bypassed with 0.1µF ceramic to GND; powers internal reference, comparators, and gate drivers; decoupled via 10Ω resistor from IN. |
| 3 COMP1 | OUT1 compensation node | Connect RC network (e.g., 82kΩ + 680pF) to GND to stabilize loop; pulled low during shutdown to disable feedback path. |
| 4 FB1 | OUT1 feedback input | Senses regulated voltage; supports internal presets (1.8V/3.3V) when FBSEL1 tied to GND/VCC, or 1.2V–VIN via external divider. |
| 5 FB2 | OUT2 feedback input | Same function as FB1; enables independent configuration of OUT2 (1.5V/2.5V presets or adjustable range). |
| 6 COMP2 | OUT2 compensation node | Independent compensation for second loop; identical RC design rules apply as COMP1. |
| 7 REF | Internal 1.2V reference output | Soft-start ramp source (25µA current); bypassed with 0.01µF–1.0µF cap; pulled low during shutdown to halt regulation. |
| 8 GND | Analog ground | Reference for FB/COMP/REF; must be star-connected to PGND near device to avoid noise coupling into sensitive analog nodes. |
| 9 POR | Open-drain power-on reset | Asserts low until both outputs stabilize, then delays 175ms before going high; requires external pullup to VCC or system rail. |
| 10 EN | Enable input | Active-high logic control; drives high to enable both regulators; pulls low to enter <1µA shutdown mode with soft-start reset. |
| 11 PFO | Open-drain power-fail output | Monitors VCC; goes high when input falls below 3.94V; used for USB power-loss detection with 10kΩ–100kΩ pullup. |
| 12 FBSEL2 | OUT2 feedback select | Tie to GND → 1.5V; tie to VCC → 2.5V; float → external resistor-divider mode (1.2V–VIN). |
| 13 FBSEL1 | OUT1 feedback select | Tie to GND → 1.8V; tie to VCC → 3.3V; float → external resistor-divider mode (1.2V–VIN). |
| 14 IN | Main power input | 2.6V–5.5V supply; bypassed with 10µF ceramic to PGND; feeds internal regulators and high-side switches. |
| 15 LX2 | High-side switch node 2 | Inductor connection for OUT2; 180° out-of-phase with LX1 to cancel input ripple and reduce required capacitance. |
| 16 PGND | Power ground | Return path for high-current LX1/LX2 switching; must be low-impedance plane under device; separate from AGND except at single point. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase switching | Reduces RMS input capacitor current by ~30%, allowing smaller 10µF ceramic instead of 47µF tantalum in space-constrained xDSL modules. |
| Integrated synchronous rectifiers | Eliminates external Schottky diodes and associated losses; achieves >88% efficiency at 500mA without heatsinking in QSOP package. |
| Programmable dual outputs | Supports four preset combinations (e.g., 3.3V/2.5V, 1.8V/1.5V) or fully adjustable rails - replaces two discrete buck converters or dual-LDOs. |
| Sub-1V capability on one output | Enables 1.0V core supply when other output is ≥1.2V (e.g., 1.0V CPU + 1.8V I/O), using cross-coupled feedback resistors per datasheet Figure 6. |
| USB-compliant power-fail detection | PFO threshold (3.94V) aligns with USB 2.0 specification minimum bus voltage, enabling fail-safe state retention in USB-powered SFPs. |
Applications
| xDSL Modems | USB-Powered SFP Modules |
|---|---|
|
Use Scenario: Powering DSL PHY and microcontroller from single USB 5V port in residential gateway. IC Role / Device Role / Timing Role: Dual buck regulator generating 3.3V (PHY interface) and 1.5V (microcontroller core) with synchronized 1.4MHz switching. Use Value: 180° phase shift cuts input capacitor size by 50%, meeting strict board area limits while maintaining <1% output ripple. |
Use Scenario: Providing isolated 1.8V and 2.5V rails for optical transceiver ICs in hot-pluggable copper SFP cages. IC Role / Device Role / Timing Role: Compact dual DC-DC converter with PFO monitoring USB VBUS to initiate graceful link shutdown before power loss. Use Value: Open-drain PFO signal triggers EEPROM save and laser disable within 100µs of VBUS droop, preventing data corruption. |
| Dual LDO Replacement | Copper Gigabit Transceivers |
|
Use Scenario: Upgrading legacy dual-LDO power tree in industrial Ethernet switch PHY to improve efficiency and thermal margin. IC Role / Device Role / Timing Role: High-efficiency buck regulator replacing TPS7A4700 + TPS7A20 - delivering same 1.8V/3.3V rails at 88% vs. 65% efficiency. Use Value: Reduces total power dissipation by 320mW at 500mA per rail, eliminating need for thermal vias or airflow in sealed enclosures. |
Use Scenario: Powering 1000BASE-T PHY and magnetics bias in compact copper gigabit GBIC modules. IC Role / Device Role / Timing Role: Dual-output regulator with ±1% accuracy ensuring stable 2.5V analog front-end and 1.2V digital core voltages across temperature. Use Value: Tight regulation tolerance prevents PHY lock loss during ambient shifts from -40°C to +85°C, improving link uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65270RGET | Fixed 1.6MHz frequency; 1.2A per channel; no PFO; requires external compensation. | Lacks integrated power-fail detection and preset feedback selection - needs additional supervisor IC for USB fail-safe operation. | Choose when higher output current (1.2A) is required and PFO functionality is implemented externally. |
| RTQ2132BGQW | 1.2MHz switching; 800mA per channel; integrated soft-start and tracking; no POR/PFO. | Includes output voltage tracking but omits power-on reset and power-fail outputs - unsuitable for USB-hosted systems requiring deterministic reset timing. | Prefer for applications needing rail sequencing (e.g., FPGA core/I/O) where POR/PFO are handled by system PMIC. |
Compared with TPS65270RGET and RTQ2132BGQW, the MAX1972EEE uniquely integrates PFO and 175ms POR delay in a 16-pin QSOP, enabling USB-powered xDSL and SFP designs without supplemental supervision circuitry - reducing BOM count and layout complexity.
Availability
MAX1972EEE is available at Aetrix Electronics and suitable for xDSL modems, USB-powered SFP modules, dual LDO replacements, and copper gigabit transceivers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX1972EEE 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 precision analog and power management ICs for demanding industrial, communications, and computing applications.
The MAX1970/MAX1971/MAX1972 family was engineered specifically for space-constrained, USB-powered broadband equipment - prioritizing high-frequency operation, dual-rail flexibility, and integrated power supervision to eliminate discrete supervisors.
FAQ
What is the maximum output current supported by each channel of the MAX1972EEE?
The MAX1972EEE guarantees 750mA continuous output current per channel across the full -40°C to +85°C operating temperature range. This rating is validated by design and production testing, and remains stable even with 100% duty cycle operation at minimum input voltage (2.6V). The internal current limit is set at 1.2A (typical) to protect against short-circuit conditions without requiring external current-sense resistors.
Does the MAX1972EEE support sub-1V output voltages, and if so, how is it configured?
Yes, the MAX1972EEE supports sub-1V outputs on one channel when the other output is set above 1.2V. This is achieved using cross-coupled feedback resistors - for example, connecting FB1 to OUT1 and OUT2 simultaneously with R1 and R2 selected to satisfy the equation R1/R2 = (VOUT2 − 1.2)/(1.2 − VOUT1). This configuration is documented in the MAX1972EEE datasheet Figure 6 and enables precise 1.0V core rails alongside 1.8V I/O supplies.
How does the PFO (power-fail output) function in the MAX1972EEE, and what is its trip threshold?
The PFO in the MAX1972EEE is an open-drain output that monitors VCC and asserts high when the input voltage falls below 3.94V (typical, falling threshold). It is designed specifically for USB-powered applications: when VCC drops below this level, PFO signals upstream controllers to initiate safe shutdown. A 10kΩ–100kΩ pullup resistor to VCC or an output rail is required, and the output sinks <1µA in high state.
What is the purpose of the FBSEL1 and FBSEL2 pins on the MAX1972EEE?
The FBSEL1 and FBSEL2 pins on the MAX1972EEE configure each output's feedback mode. Tying FBSEL1 to GND selects 1.8V on OUT1; tying to VCC selects 3.3V. Similarly, FBSEL2 sets OUT2 to 1.5V (GND) or 2.5V (VCC). Leaving either pin unconnected enables external resistor-divider programming for any output voltage from 1.2V to VIN, providing flexible rail generation without redesigning feedback networks.
Can the MAX1972EEE be used with all-ceramic capacitors, and what are the recommended values?
Yes, the MAX1972EEE is fully compatible with all-ceramic capacitor designs. Recommended values include a 10µF X5R/X7R ceramic capacitor from IN to PGND, 0.1µF ceramic from VCC to GND, and 0.01µF–1.0µF ceramic from REF to GND. Output capacitors of 10µF–22µF ceramic are typical per rail. The device's current-mode control and internal compensation ensure stability with low-ESR ceramics, eliminating the need for aluminum or tantalum alternatives.
MAX1972EEE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 750mA
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX1972EEE FAQ
1.How can I place an order for MAX1972EEE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1972EEE 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 MAX1972EEE reliable?
The price and inventory of MAX1972EEE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1972EEE is usually 5 days.
3.What payment methods are accepted for MAX1972EEE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1972EEE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1972EEE?
MAX1972EEE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1972EEE 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 MAX1972EEE?
For technical support, including MAX1972EEE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1972EEE requirements.
6.How does Aetrix verify that MAX1972EEE is sourced from the original manufacturer or authorized distributors?
All MAX1972EEE 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 MAX1972EEE meets industry standards.
7.What is the process for return or replacement of MAX1972EEE?
All MAX1972EEE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1972EEE, 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 MAX1972EEE part is unused and in its original packaging.
Return procedure for MAX1972EEE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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