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Analog Devices Inc./Maxim Integrated MAX1742EEE+
- Part No.:
- MAX1742EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1742EEE+.pdf
- Description:
- IC REG BUCK ADJ 1A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:352
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Product details
Overview
MAX1742EEE+ from Maxim Integrated is a constant-off-time, synchronous step-down DC-DC regulator delivering up to 1A continuous output current with internal 90mΩ PMOS and 70mΩ NMOS switches, 2.5V/1.8V/1.5V pin-selectable or adjustable 1.1V–VIN output, 3V–5.5V input range, and up to 95% efficiency - designed for CPU I/O ring and chipset supplies in notebook computers.
For engineers reviewing the MAX1742EEE+ datasheet, MAX1742EEE+ pinout, MAX1742EEE+ application, or MAX1742EEE+ equivalent, key selection criteria include its 1MHz programmable switching frequency, Idle Mode™ light-load efficiency optimization, 100% duty-cycle low-dropout operation, ±1% output accuracy, and thermal shutdown protection.
Technical Context
The MAX1742EEE+ employs a current-mode, constant-off-time PWM architecture that regulates output by varying PMOS on-time while holding off-time fixed via external RTOFF. It transitions between constant-off-time mode (heavy load) and proprietary Idle Mode™ (light load) to minimize gate-charge and transition losses.
Its integrated synchronous rectification eliminates external Schottky diodes; the 90mΩ PMOS switch and 70mΩ NMOS switch operate with cycle-skipping during Idle Mode and support 100% duty-cycle operation near dropout. Feedback is set via FBSEL pin (GND/REF/VCC/unconnected) to select 1.5V/1.8V/2.5V or enable adjustable output using VREF = 1.100V ±1.2%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports stable power delivery to CPU I/O and chipset rails without external current-sense resistors. |
| Input Voltage Range | 3.0V to 5.5V - compatible with standard 3.3V and 5V system rails in portable computing platforms. |
| Output Voltage Options | 1.5V / 1.8V / 2.5V (pin-selectable) or 1.1V–VIN (adjustable) - enables direct replacement across multiple voltage domains without redesign. |
| Switching Frequency | Up to 1MHz (programmable via RTOFF) - allows optimization of inductor size, EMI, and efficiency trade-offs in space-constrained layouts. |
| Efficiency | Up to 95% - achieved via synchronous rectification and low RDS(ON) internal switches, reducing thermal load and enabling compact thermal design. |
| Accuracy | ±1% output voltage tolerance - ensures tight regulation for sensitive digital core and I/O supplies under line/load/temperature variation. |
| Shutdown Current | <1µA - enables ultra-low-power standby states in battery-powered notebooks and subnotebooks. |
Pinout & Package
MAX1742EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), optimized for high-density PCB layouts in portable computing applications. Thermal performance is enhanced by PGND pins (pins 13 & 15) and LX (pins 3 & 14) routing for low-inductance power paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-controlled shutdown input | Drives internal circuitry and MOSFETs into <1µA quiescent state; VIH ≥ 2.0V, VIL ≤ 0.8V - compatible with standard CMOS logic. |
| IN (Pins 2, 4) | Main power input for PMOS switch | Accepts 3V–5.5V supply; dual pins reduce IR drop and improve current sharing in high-current paths. |
| LX (Pins 3, 14, 16) | Switch node connection | Connects drains of internal PMOS and NMOS switches to external inductor - requires low-inductance layout to minimize ringing and EMI. |
| SS (Pin 5) | Soft-start timing node | Capacitor-to-GND sets inrush current ramp rate; ISS = 4–6µA source current - prevents input rail sag during startup. |
| COMP (Pin 6) | Integrator compensation node | Connects external capacitor (typically 470pF) to VCC for loop stability - enables precise DC accuracy without high-gain op-amps. |
| TOFF (Pin 7) | Off-time programming input | Resistor-to-GND sets tOFF (0.4–5.2µs), directly determining max switching frequency up to 1MHz. |
| FB (Pin 8) | Voltage feedback input | Senses output directly (fixed mode) or via resistor divider (adjustable mode); IFB ≤ 250nA - minimizes divider current error. |
| GND (Pin 9) | Analog ground reference | Separate from PGND to isolate noise-sensitive analog circuitry from high-current switching return paths. |
| REF (Pin 10) | Internal 1.100V reference output | Bypassed with 1µF capacitor; ΔVREF ≤ 2mV over load - serves as precision reference for adjustable configurations. |
| FBSEL (Pin 11) | Output voltage selection control | Logic levels (GND/REF/VCC/unconnected) configure preset 1.5V/1.8V/2.5V or enable adjustable mode - no external logic required. |
| VCC (Pin 12) | Analog supply input | Internally regulated; bypassed with 10Ω + 2.2µF RC filter to suppress noise coupling into control circuitry. |
| PGND (Pins 13, 15) | Power ground return | Internally tied to NMOS source; dual pins lower impedance path for high di/dt currents and reduce ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Idle Mode™ operation | Skips switching cycles below 0.5A load threshold, reducing gate-charge loss and maintaining >85% efficiency at 10mA output. |
| Programmable constant-off-time | RTOFF-set tOFF (0.4–5.2µs) enables precise frequency control from 270kHz to 1MHz - critical for EMI compliance and inductor sizing. |
| 100% duty-cycle low-dropout mode | PMOS remains fully on when VIN ≈ VOUT; dropout = IOUT × 90mΩ - supports operation down to VIN – VOUT = 90mV @ 1A. |
| Integrated synchronous switches | 90mΩ PMOS + 70mΩ NMOS eliminate external Schottky diode, saving board area and improving efficiency by ~8% vs. asynchronous designs. |
| Adjustable soft-start | Capacitor-programmed startup ramp limits inrush current to prevent input rail collapse and avoid false UVLO triggering. |
| Thermal shutdown with hysteresis | Triggers at 160°C (15°C hysteresis) - protects against sustained overload or poor heatsinking without requiring external thermal monitoring. |
Applications
| Mobile CPU Core Supply | Notebook Chipset Rail |
|---|---|
Use Scenario: Powers Intel Pentium M or AMD Mobile Athlon XP processor I/O ring from 5V or 3.3V main rail. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated 1.8V or 2.5V with fast transient response to dynamic CPU load changes. Use Value: Achieves 95% peak efficiency and <100µs load-step recovery time, minimizing thermal stress and extending battery runtime. |
Use Scenario: Supplies Northbridge/Southbridge logic in ultraportable notebooks where board space and thermal envelope are constrained. IC Role / Device Role / Timing Role: Fixed-output (1.5V/1.8V) step-down converter with integrated switches and no external diode - simplifies BOM and layout. Use Value: Reduces component count by 4 parts (vs. discrete MOSFET + diode + controller) and cuts solution footprint by 35%. |
| Subnotebook Memory Interface | Embedded Controller Power |
Use Scenario: Delivers clean, low-noise 2.5V to DDR SDRAM interface in subnotebook systems with aggressive EMI requirements. IC Role / Device Role / Timing Role: High-frequency (1MHz) buck regulator with programmable RTOFF to shift switching noise above sensitive memory bandwidth. Use Value: Enables use of smaller 2.2µH inductors and reduces conducted EMI by 12dB compared to 500kHz alternatives. |
Use Scenario: Powers ARM7/ARM9-based embedded controllers in industrial handhelds requiring reliable low-power shutdown. IC Role / Device Role / Timing Role: Always-on auxiliary rail generator with <1µA shutdown current and 100% duty-cycle operation during brownout conditions. Use Value: Maintains RTC and wake-up logic functionality during battery swap or deep sleep, eliminating system reset on power restoration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1644EEE+ | 2A continuous output, 3.3V–28V input, external MOSFETs - higher voltage range but requires 4 external FETs and more complex loop compensation. | Targeted at industrial 12V/24V systems, not 3.3V/5V portable rails - unsuitable for space-constrained notebook designs. | Select MAX1644EEE+ only when input exceeds 5.5V or continuous current >1A is required; MAX1742EEE+ offers lower BOM cost and simpler layout for 3–5.5V apps. |
| TPS62231DRVR | 1A, 2.05V–6.5V input, 1.8V/2.5V/3.3V fixed or adjustable, 3.5MHz sync buck - higher frequency enables 1µH inductors but lower max efficiency (92% vs. 95%). | Optimized for ultra-thin tablets with strict height constraints; lacks Idle Mode™ and has higher light-load IQ (12µA vs. <1µA shutdown). | Choose TPS62231DRVR for ultra-small solutions needing <1mm profile; MAX1742EEE+ remains superior for battery life-critical notebook I/O rails. |
Compared with MAX1644EEE+ and TPS62231DRVR, the MAX1742EEE+ uniquely balances 1A capability, integrated switches, <1µA shutdown, and Idle Mode™ - making it the optimal choice for space- and efficiency-constrained 3.3V/5V-to-low-voltage conversion in portable computing.
Availability
MAX1742EEE+ is available at Aetrix Electronics and suitable for notebook computer power management, CPU I/O ring regulation, and chipset supply applications requiring stable component supply, lead-free compliance, and -40°C to +85°C industrial temperature operation.
Supply support for MAX1742EEE+ 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 computing, communications, and industrial markets.
The MAX1742EEE+ belongs to Maxim's high-efficiency synchronous buck regulator product line, engineered specifically for low-voltage, high-current power conversion in portable computing platforms where efficiency, integration, and thermal performance are critical.
FAQ
What output voltages does the MAX1742EEE+ support?
The MAX1742EEE+ supports three preset outputs - 1.5V, 1.8V, and 2.5V - selected via the FBSEL pin (unconnected, REF, or VCC respectively). When FBSEL is grounded, it operates in adjustable mode with output range from 1.1V to VIN, using a resistive divider referenced to the internal 1.100V ±1.2% reference. The MAX1742EEE+ achieves ±1% total output accuracy across temperature and load.
How is switching frequency programmed on the MAX1742EEE+?
Switching frequency on the MAX1742EEE+ is set by connecting a resistor (RTOFF) from the TOFF pin to GND. This resistor determines the constant off-time (tOFF = 0.4–5.2µs), which - combined with input/output voltage - establishes the operating frequency up to 1MHz. For example, RTOFF = 75kΩ yields ~833kHz at VIN = 5.0V and VOUT = 1.8V. The MAX1742EEE+ datasheet provides lookup tables for common configurations.
Does the MAX1742EEE+ require an external Schottky diode?
No, the MAX1742EEE+ does not require an external Schottky diode. It integrates both a 90mΩ PMOS power switch and a 70mΩ NMOS synchronous rectifier switch, enabling full synchronous rectification. This eliminates conduction losses associated with Schottky diodes and improves efficiency by up to 8% compared to asynchronous buck converters - a key advantage confirmed in MAX1742EEE+ efficiency plots across load conditions.
What is Idle Mode™ and how does it benefit the MAX1742EEE+?
Idle Mode™ is Maxim's proprietary light-load efficiency enhancement used in the MAX1742EEE+. When output current drops below half the Idle Mode threshold (~0.5A for MAX1742EEE+), the device skips switching cycles to reduce gate-charge and transition losses. This maintains >85% efficiency at 10mA load - significantly outperforming conventional PWM regulators - while preserving fast transient response when load increases.
What package type and thermal characteristics does the MAX1742EEE+ have?
The MAX1742EEE+ is supplied in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch) with lead-free finish. Its junction-to-ambient thermal resistance (θJA) is 80°C/W on a 0.5in² copper pad with no airflow. The device includes thermal shutdown at 160°C with 15°C hysteresis. Proper layout - including wide PGND/LX traces and thermal vias under the exposed pad (if present) - is essential to sustain 1A continuous operation in compact notebook PCBs.
MAX1742EEE+ 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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.1V (1.5V, 1.8V, 2.5V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX1742EEE+ FAQ
1.How can I place an order for MAX1742EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1742EEE+ 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 MAX1742EEE+ reliable?
The price and inventory of MAX1742EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1742EEE+ is usually 5 days.
3.What payment methods are accepted for MAX1742EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1742EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1742EEE+?
MAX1742EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1742EEE+ 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 MAX1742EEE+?
For technical support, including MAX1742EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1742EEE+ requirements.
6.How does Aetrix verify that MAX1742EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1742EEE+ 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 MAX1742EEE+ meets industry standards.
7.What is the process for return or replacement of MAX1742EEE+?
All MAX1742EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1742EEE+, 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 MAX1742EEE+ part is unused and in its original packaging.
Return procedure for MAX1742EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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