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Analog Devices Inc./Maxim Integrated MAX1742EEE-T
- Part No.:
- MAX1742EEE-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1742EEE-T.pdf
- Description:
- IC REG BUCK ADJ 1A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:326
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Product details
Overview
MAX1742EEE-T 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 1.1V–VIN adjustable output, and 1MHz max switching frequency. It targets low-voltage conversion in notebook/subnotebook CPU I/O ring and chipset supplies.
For engineers reviewing the MAX1742EEE-T datasheet, MAX1742EEE-T pinout, MAX1742EEE-T application, or MAX1742EEE-T equivalent, key selection criteria include its 1A continuous rating (vs. MAX1842's 2.7A burst), Idle Mode™ light-load efficiency, programmable off-time architecture, and QSOP-16 package compatibility with space-constrained portable power rails.
Technical Context
The MAX1742EEE-T implements a current-mode, constant-off-time PWM control scheme with proprietary Idle Mode™ for cycle-skipping below 0.05A–0.55A load thresholds, enabling high efficiency across wide load ranges. Its regulation relies on summing comparator inputs: output voltage error, integrated error correction (via external COMP capacitor), and sensed PMOS switch current - eliminating external current-sense resistors.
It operates in three distinct modes: constant-off-time mode above Idle threshold (continuous conduction), Idle Mode™ below threshold (discontinuous conduction with pulse skipping), and 100% duty-cycle mode during low-dropout conditions where the PMOS remains fully on. Thermal shutdown at 160°C and output short-circuit protection are integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports stable core logic and I/O rail loads without external current boosting |
| Input Voltage Range | 3.0V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V) and regulated 3.3V/5V system rails |
| Output Voltage Options | Pin-selectable 2.5V/1.8V/1.5V or adjustable 1.1V–VIN - enables direct replacement across multiple voltage domains |
| Switching Frequency | Up to 1MHz - allows use of small inductors (e.g., 3.9µH) and reduces EMI filtering footprint |
| Efficiency | Up to 95% - achieved via synchronous rectification eliminating Schottky diode losses |
| Shutdown Current | <1µA - ensures minimal battery drain in system sleep states |
| Reference Accuracy | ±1% over -40°C to +85°C - guarantees tight output regulation without trimming |
Pinout & Package
MAX1742EEE-T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch) with exposed thermal pad (not electrically connected), optimized for thermal performance on standard PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN | Logic-level shutdown input | Pull low to disable all internal circuitry and reduce supply current below 1µA; high or tied to VCC for operation |
| IN | Main power input (pins 2, 4) | Supplies internal PMOS switch; requires local 10µF low-ESR ceramic input capacitor |
| LX | Switch node (pins 3, 14, 16) | Connects to inductor; carries high di/dt current - must be routed with minimum loop area |
| SS | Soft-start timing node | Capacitor to GND sets startup inrush current ramp rate; prevents input voltage sag |
| FBSEL | Output voltage select input | Configures preset (GND/REF/VCC/unconnected) or adjustable mode (GND) |
| FB | Feedback input | Direct connection to output for fixed voltage; resistive divider for adjustable mode (VREF = 1.1V) |
| PGND | Power ground (pins 13, 15) | Return path for NMOS synchronous rectifier; separate from analog GND to minimize noise coupling |
| GND | Analog ground (pin 9) | Reference for internal comparators and reference; must be star-connected near REF/COMP |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Switches | 90mΩ PMOS + 70mΩ NMOS at VIN=4.5V - eliminates external Schottky diode and reduces conduction loss by >30% vs. asynchronous designs |
| Idle Mode™ Operation | Active below 0.05A–0.55A load - skips switching cycles to maintain >85% efficiency at microamp loads |
| Programmable Off-Time | Set via RTOFF resistor (36kΩ–430kΩ) - enables precise trade-off between efficiency, ripple, and component size |
| 100% Duty-Cycle Low-Dropout | PMOS remains fully on when VIN ≈ VOUT - supports operation down to dropout of ~250mV at 1A |
| Integrated Protection | Thermal shutdown (160°C), output short-circuit, and undervoltage lockout (2.5V–2.7V) - no external fault-handling circuitry required |
Applications
| CPU I/O Ring Supply | Chipset Core Voltage |
|---|---|
Use Scenario: Powering memory interface buffers and PCIe PHYs in subnotebook platforms with tight thermal envelopes. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1.8V or 2.5V at up to 1A with fast transient response. Use Value: Idle Mode™ maintains >90% efficiency at standby currents under 100µA, extending battery life without compromising wake-up speed. |
Use Scenario: Generating core voltage for northbridge/southbridge ICs requiring ±1% accuracy and low-noise operation. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with FBSEL = REF for 1.8V, used with 47µF output capacitance. Use Value: Internal 1.1V reference and ±1% output tolerance eliminate need for external feedback trimming, reducing BOM count. |
| Notebook System Rail | Low-Power Embedded Controller |
Use Scenario: Converting 5V main rail to 1.5V for USB controller and audio codec subsystems. IC Role / Device Role / Timing Role: Adjustable-output buck regulator (FBSEL = GND, R1/R2 divider) supporting dynamic voltage scaling. Use Value: 1.1V–VIN range and 1MHz capability allow compact 2.2µH inductor + 47µF ceramic output filter, minimizing board area. |
Use Scenario: Powering ARM Cortex-M0+ microcontrollers in always-on sensor nodes with multi-year battery life. IC Role / Device Role / Timing Role: Shutdown-controlled regulator activated only during data acquisition bursts. Use Value: Sub-1µA shutdown current and soft-start prevent brownout during wake-up, ensuring reliable firmware execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1842EEE-T | Higher 3.1A min current limit and 2.7A burst capability; same pinout and feature set | Suitable for applications needing occasional high-current transients (e.g., display backlight drivers) | Select MAX1842EEE-T when peak load exceeds 1A; otherwise MAX1742EEE-T offers better light-load efficiency and smaller external components |
| MAX1623ESA+ | 2A continuous output, different control architecture (voltage-mode), 20-pin SO package | Targets higher-current embedded systems with less stringent size constraints | Choose MAX1623ESA+ only if 2A continuous current is required; not pin-compatible and lacks Idle Mode™ |
Compared with MAX1842EEE-T and MAX1623ESA+, the MAX1742EEE-T provides optimal balance of 1A continuous delivery, ultra-low shutdown current, and QSOP-16 footprint for space-limited portable designs - making it preferred for sustained moderate loads with aggressive battery life targets.
Availability
MAX1742EEE-T is available at Aetrix Electronics and suitable for notebook power management, chipset supply rails, and low-power embedded controller applications requiring stable component supply and long-term lifecycle support.
Supply support for MAX1742EEE-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) designs precision analog and power management ICs for demanding industrial, computing, and portable applications.
The MAX1742/MAX1842 product line was engineered specifically for high-efficiency, low-voltage DC-DC conversion in space-constrained mobile computing platforms - emphasizing light-load efficiency, small external component count, and robust thermal behavior.
FAQ
What output voltage options does the MAX1742EEE-T support?
The MAX1742EEE-T supports three preset output voltages - 2.5V (FBSEL = VCC), 1.8V (FBSEL = REF), and 1.5V (FBSEL unconnected) - or an adjustable range from 1.1V to VIN when FBSEL is grounded and FB is connected to a resistive divider. The internal 1.1V reference ensures ±1% accuracy across temperature, and no external trimming is needed for fixed outputs.
How does the MAX1742EEE-T achieve high efficiency at light loads?
The MAX1742EEE-T uses Maxim's proprietary Idle Mode™, which skips switching cycles when load current falls below 0.05A–0.55A (depending on operating conditions). This reduces gate-drive and transition losses, maintaining >85% efficiency even at microamp loads - critical for battery-powered standby operation. The mode transitions seamlessly without output disturbance.
What is the maximum switching frequency of the MAX1742EEE-T?
The MAX1742EEE-T supports a maximum switching frequency of 1MHz, set via the RTOFF resistor connected from TOFF to GND. At 1MHz, it enables use of compact inductors (e.g., 3.9µH) and low-ESR ceramic output capacitors, reducing solution size and cost. Frequency decreases automatically in Idle Mode™ to further conserve energy.
Does the MAX1742EEE-T require an external Schottky diode?
No, the MAX1742EEE-T does not require an external Schottky diode. It integrates both a 90mΩ PMOS power switch and a 70mΩ NMOS synchronous rectifier switch, eliminating conduction losses associated with external diodes and improving full-load efficiency to up to 95%. This also reduces component count and board area.
What protection features are built into the MAX1742EEE-T?
The MAX1742EEE-T includes thermal shutdown (160°C with 15°C hysteresis), output short-circuit protection, undervoltage lockout (2.5V–2.7V falling threshold), and current limiting (1.2A–1.8A min). These functions operate autonomously without external components, ensuring robust operation in real-world conditions such as hot-plug events or output faults.
MAX1742EEE-T 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:
- 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:
- Up to 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX1742EEE-T FAQ
1.How can I place an order for MAX1742EEE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1742EEE-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 MAX1742EEE-T reliable?
The price and inventory of MAX1742EEE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1742EEE-T is usually 5 days.
3.What payment methods are accepted for MAX1742EEE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1742EEE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1742EEE-T?
MAX1742EEE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1742EEE-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 MAX1742EEE-T?
For technical support, including MAX1742EEE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1742EEE-T requirements.
6.How does Aetrix verify that MAX1742EEE-T is sourced from the original manufacturer or authorized distributors?
All MAX1742EEE-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 MAX1742EEE-T meets industry standards.
7.What is the process for return or replacement of MAX1742EEE-T?
All MAX1742EEE-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1742EEE-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 MAX1742EEE-T part is unused and in its original packaging.
Return procedure for MAX1742EEE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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