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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:2,147
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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, preset 2.5V/1.8V/1.5V or adjustable 1.1V–VIN output, and 1MHz max switching frequency - used in CPU I/O ring and chipset supplies for notebook computers.
For engineers reviewing the MAX1742EEE datasheet, MAX1742EEE pinout, MAX1742EEE application, or MAX1742EEE equivalent, key selection factors include its 1A continuous current rating, ±1% output accuracy, Idle Mode™ light-load efficiency optimization, 16-pin QSOP package, and programmable constant-off-time architecture enabling trade-offs between efficiency, noise, and component size.
Technical Context
The MAX1742EEE implements a current-mode, constant-off-time PWM control scheme with proprietary Idle Mode™ that skips switching cycles below 0.05A–0.55A load threshold, reducing gate-charge and transition losses. It uses internal current sensing without external sense resistors and maintains regulation by dynamically adjusting on-time while holding off-time fixed via RTOFF.
It operates in three distinct modes: constant-off-time mode above Idle Mode threshold (continuous conduction), Idle Mode™ below threshold (discontinuous conduction with pulse skipping), and 100% duty-cycle low-dropout mode when VIN ≈ VOUT, where the PMOS remains fully on - all enabled by integrated synchronous rectification eliminating external Schottky diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports stable power delivery to CPU I/O and chipset rails without thermal derating under typical notebook ambient conditions. |
| Input Voltage Range | 3.0V to 5.5V - compatible with standard 3.3V and 5V system rails in subnotebook platforms. |
| Output Voltage Options | Preset 2.5V/1.8V/1.5V (pin-selectable) or adjustable 1.1V–VIN - enables direct replacement across multiple core voltage requirements without redesign. |
| Switching Frequency | Up to 1MHz - allows use of small inductors (e.g., 3.9μH) and ceramic output capacitors, reducing board area and cost. |
| Efficiency | Up to 95% - achieved via synchronous rectification and low RDS(ON) internal switches (90mΩ PMOS / 70mΩ NMOS at VIN = 4.5V). |
| Accuracy & Regulation | ±1% output accuracy over temperature; <0.4% DC load regulation - ensures tight voltage tolerance for sensitive logic interfaces. |
| Quiescent Current | 600μA max operating supply current; <1μA shutdown current - extends battery life during suspend states. |
Pinout & Package
MAX1742EEE is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch) with exposed thermal pad (not electrically connected), optimized for compact notebook PCB layouts and moderate power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN | Shutdown control input | Logic-level enable: pull low to disable all internal circuitry and reduce supply current to <1μA; high or tied to VCC for normal operation. |
| IN, PGND | Main power path terminals | IN supplies the internal PMOS switch; PGND returns the NMOS synchronous rectifier - both carry high pulsed currents and require dedicated copper pours. |
| LX | Switch node | Drain connection of internal PMOS and NMOS switches - directly connects to inductor; requires short, low-inductance routing to minimize switching noise and shoot-through risk. |
| FB, FBSEL | Feedback network interface | FB senses output voltage; FBSEL selects preset voltage (GND/REF/VCC/floating) or enables adjustable mode - determines reference divider configuration. |
| SS | Soft-start timing node | Capacitor-to-ground sets startup inrush current ramp rate - prevents input rail sag and output overshoot during power-up. |
| TOFF | Off-time programming input | Resistor-to-ground sets constant off-time (0.4–5.2μs), directly determining switching frequency up to 1MHz. |
| COMP | Integrator compensation node | Connects external capacitor (typically 470pF) to VCC to stabilize control loop and maintain ±1% DC accuracy without high-gain op-amps. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous switches | 90mΩ PMOS + 70mΩ NMOS eliminate external Schottky diode, reducing BOM count and conduction losses by >30% vs. asynchronous designs. |
| Idle Mode™ operation | Automatically skips pulses below 0.05A–0.55A load, cutting switching losses and maintaining >85% efficiency at 1mA output current. |
| 100% duty-cycle low-dropout mode | Enables regulation down to VIN – (IOUT × 90mΩ), supporting brownout operation without output collapse when input sags near VOUT. |
| Adjustable soft-start | Capacitor-programmable inrush limiting prevents input capacitor surge currents exceeding 1.5× rated output current during startup. |
| Thermal shutdown & short-circuit protection | 160°C junction shutdown with 15°C hysteresis and cycle-by-cycle current limiting (1.2A–1.8A threshold) ensure robust fault handling in compact enclosures. |
Applications
| CPU I/O Ring Supply | Chipset Core Voltage |
|---|---|
Use Scenario: Powering I/O buffers and interface logic in Intel Pentium M or AMD Mobile Athlon platforms requiring stable 1.8V at ≤1A. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated voltage with fast transient response to dynamic I/O activity. Use Value: ±1% output accuracy and <0.4% load regulation prevent signal integrity errors during high-speed bus transactions. |
Use Scenario: Generating 2.5V core voltage for northbridge or memory controller in subnotebook motherboards. IC Role / Device Role / Timing Role: Fixed-output step-down converter with pin-selectable VOUT, simplifying layout and eliminating feedback resistor networks. Use Value: 95% peak efficiency reduces thermal load on chipset heatsinks and extends battery runtime during active compute. |
| Notebook System Rail | Low-Power Peripheral Supply |
Use Scenario: Converting 5V main battery rail to 1.5V for DDR SDRAM termination or display interface logic. IC Role / Device Role / Timing Role: Adjustable-output buck regulator using FBSEL=GND and external resistor divider for precise voltage tuning. Use Value: Programmable constant-off-time (via RTOFF) allows optimization of switching frequency to avoid EMI bands near 800–900MHz. |
Use Scenario: Powering always-on USB PHY or embedded controller in suspend-to-RAM mode with microamp quiescent draw. IC Role / Device Role / Timing Role: Light-load-optimized regulator leveraging Idle Mode™ to sustain >88% efficiency at 100μA output current. Use Value: <1μA shutdown current and adjustable soft-start enable zero-power state retention and glitch-free wake-up sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1644EEE | 2A continuous output, 500kHz max frequency, no Idle Mode™, requires external MOSFETs | Higher current capability but larger solution size and lower light-load efficiency | Select for higher sustained load demands where 1MHz switching noise must be avoided. |
| TPS62231DRYR | 1A output, 3.5MHz fixed frequency, DCS-Control™ topology, 1.2V–5.5V input, 0.6V–5.5V adjustable output | Smaller footprint (6-pin WSON), faster transient response, but lacks pin-selectable presets and 100% duty-cycle mode | Select for space-constrained designs needing ultra-fast load step recovery and minimal external components. |
Compared with MAX1742EEE, MAX1644EEE offers higher current but requires external FETs and lacks light-load optimization, while TPS62231DRYR delivers superior transient performance in a smaller package but sacrifices preset voltage flexibility and dropout headroom.
Availability
MAX1742EEE is available at Aetrix Electronics and suitable for notebook computer power management, CPU I/O ring supplies, and chipset core voltage regulation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for computing, communications, and industrial applications.
The MAX1742EEE belongs to Maxim's synchronous buck regulator product line designed specifically for space- and efficiency-constrained portable computing systems requiring integrated power switches and precision voltage regulation.
FAQ
What is the maximum continuous output current supported by the MAX1742EEE?
The MAX1742EEE supports up to 1A of continuous output current across its full operating temperature range (-40°C to +85°C). Its internal 90mΩ PMOS and 70mΩ NMOS switches, combined with thermal shutdown at 160°C, enable reliable operation without external current-sense components or heatsinking in typical notebook PCB layouts.
How does the MAX1742EEE achieve high efficiency at light loads?
The MAX1742EEE achieves high light-load efficiency through its proprietary Idle Mode™, which skips switching cycles when output current falls below 0.05A–0.55A. This eliminates unnecessary gate-drive and transition losses, maintaining >85% efficiency even at 1mA load - critical for notebook suspend-to-RAM operation where the MAX1742EEE draws only <1μA in shutdown.
Can the MAX1742EEE operate with input voltage close to the output voltage?
Yes, the MAX1742EEE supports 100% duty-cycle operation when input voltage approaches output voltage, keeping the internal PMOS switch continuously on. Dropout voltage equals IOUT × 90mΩ (plus parasitic inductor resistance), enabling regulation down to VIN = VOUT + 90mV at 1A - essential for brownout resilience in battery-powered MAX1742EEE applications.
What package type is used for the MAX1742EEE and what are its thermal characteristics?
The MAX1742EEE uses a 16-pin QSOP package (5.3mm × 10.2mm) with θJA ≈ 80°C/W on a 0.5in² copper pad and no airflow. Its internal power dissipation is dominated by conduction losses in the PMOS switch (PD ≈ IOUT² × 90mΩ), making thermal design dependent on PGND and IN copper area - not the exposed pad, which is non-functional.
How is the output voltage selected on the MAX1742EEE?
The MAX1742EEE supports both preset and adjustable outputs. Preset voltages (2.5V, 1.8V, or 1.5V) are selected by connecting FBSEL to VCC, REF, or floating/unconnected respectively. For adjustable output (1.1V–VIN), connect FBSEL to GND and use a resistive divider from VOUT to GND with FB tied to the divider midpoint - ensuring VFB = VREF = 1.1V.
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:
- Obsolete
- 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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