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Analog Devices Inc./Maxim Integrated MAX1790EUA-T
- Part No.:
- MAX1790EUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1790EUA-T.pdf
- Description:
- IC REG BST SEPIC ADJ 1.2A 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX1790EUA-T from Maxim Integrated is a high-efficiency, current-mode, fixed-frequency boost DC-DC converter with an integrated 1.6A/0.21Ω n-channel MOSFET, operating from 2.6V to 5.5V input and delivering up to 12V output. It features pin-selectable 640kHz or 1.2MHz switching, 0.1µA shutdown current, and programmable soft-start - optimized for space-constrained LCD bias supplies and portable display power rails.
For engineers reviewing the MAX1790EUA-T datasheet, MAX1790EUA-T pinout, MAX1790EUA-T application, or MAX1790EUA-T equivalent, key selection criteria include its 8-pin µMAX package footprint, adjustable feedback regulation (1.24V reference), external compensation flexibility, and verified performance in low-profile TFT-LCD power designs requiring <1.1mm solution height.
Technical Context
The MAX1790EUA-T employs a current-mode PWM architecture with slope compensation to ensure loop stability at high duty cycles, enabling fast transient response and low-noise operation. Its error amplifier compares FB voltage to a precise 1.24V reference and drives COMP to modulate peak inductor current via internal current sensing (RCS = 0.30–0.65 V/A).
Switching frequency is selected by FREQ pin logic level (GND = 640kHz, IN = 1.2MHz), and soft-start is controlled by external capacitor charging at 4µA to limit inrush. Shutdown disables all bias circuitry except LX gate drive, reducing supply current to 0.1µA while maintaining diode-connected output path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 5.5V - supports single-cell Li+ and 3.3V system rails without pre-regulation. |
| Output Voltage Range | Adjustable from VIN to 12V - set via resistor divider on FB pin with 1.24V reference. |
| Switching Frequency | 640kHz or 1.2MHz (pin-selectable) - enables compact magnetics and low-profile (<1.1mm) PCB layouts. |
| Integrated MOSFET | 1.6A, 0.21Ω, 14V-rated n-channel - eliminates external switch, reduces BOM count and layout area. |
| Shutdown Current | 0.1µA - preserves battery life in always-on portable devices during sleep mode. |
| Feedback Reference | 1.24V ±1.5% - ensures accurate output regulation across temperature and load conditions. |
| Soft-Start Control | External capacitor (CSS) charged at 4µA - prevents inrush current and output overshoot during power-up. |
Pinout & Package
MAX1790EUA-T is housed in an 8-pin µMAX® package (3.0mm × 3.0mm × 1.1mm, lead pitch 0.65mm), optimized for ultra-low profile applications including AMLCD panel power supplies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Compensation node for error amplifier | Connects external R-C network to stabilize feedback loop; determines transient response and phase margin. |
| 2 - FB | Feedback input | Senses output voltage via resistor divider; 1.24V reference sets regulated VOUT = 1.24V × (1 + R1/R2). |
| 3 - SHDN | Active-low shutdown control | Pulls low to disable switching and reduce supply current to 0.1µA; internal pull-up not present. |
| 4 - GND | Analog/digital ground reference | Star-ground connection point for power and signal paths; critical for noise immunity and stability. |
| 5 - LX | Switch node | Drives external inductor/catch diode; high dI/dt node requiring minimal trace area to suppress EMI. |
| 6 - IN | Input supply | Accepts 2.6V–5.5V input; requires ≥1µF ceramic bypass capacitor directly to GND. |
| 7 - FREQ | Frequency select input | Logic-low = 640kHz, logic-high = 1.2MHz; internal 5µA pulldown enables default 640kHz if left open. |
| 8 - SS | Soft-start capacitor terminal | Charged at 4µA to control inrush; discharged to GND during shutdown; 0.5V threshold initiates soft-start. |
Key Features
| Feature | Design Value |
|---|---|
| High efficiency up to 90% | Reduces thermal load in sealed handheld enclosures and extends battery runtime in portable displays. |
| Pin-selectable switching frequency | Enables trade-off between inductor size (1.2MHz → smaller L) and EMI filtering ease (640kHz → lower harmonic energy). |
| Programmable soft-start | Prevents output overshoot and inrush-induced voltage droop on shared input rails during cold start. |
| External loop compensation | Allows tuning of transient response and stability for diverse output capacitors (tantalum, ceramic, polymer). |
| Ultra-small 8-pin µMAX package | Supports <1.1mm total solution height - essential for slim AMLCD modules and PCMCIA card power supplies. |
Applications
| AMLCD Panel Bias Supply | PCMCIA Card Power Management |
|---|---|
Use Scenario: Generating +9V and −9V rails for active-matrix LCD column/row drivers from a 3.3V host bus. IC Role / Device Role / Timing Role: Primary step-up regulator controlling V1 output; synchronizes with secondary charge-pump stages via stable LX switching edge. Use Value: Achieves 1.2mm max profile using 6.8µH inductor and 3×3.3µF ceramic output caps - validated in Figure 4 reference design. | Use Scenario: Providing regulated 5V or 12V from 3.3V PCMCIA slot power for peripheral interface ICs and flash memory. IC Role / Device Role / Timing Role: Standalone boost controller with shutdown control tied to card-insertion detection signal. Use Value: 0.1µA shutdown current meets PCMCIA Type II hot-swap leakage requirements; 640kHz operation simplifies EMI filtering on compact card PCBs. |
| Handheld Medical Display | Industrial Hand-Held Scanner |
Use Scenario: Powering high-brightness white LED backlights and touch-controller analog supplies in battery-operated diagnostic tools. IC Role / Device Role / Timing Role: Primary DC-DC stage feeding downstream LDOs; soft-start prevents sensor reset during power-on sequence. Use Value: 90% efficiency at 200mA load extends 2000mAh Li+ battery life to >8 hours; 1.2MHz option allows 2.7µH inductor for minimal board area. | Use Scenario: Delivering stable 9V rail to laser diode driver and image sensor analog front-end in barcode scanners. IC Role / Device Role / Timing Role: Fixed-output boost converter with FREQ tied to IN for 1.2MHz operation and fast transient recovery during scan bursts. Use Value: Load-transient response tested to 200mA step (Figure toc09) shows <50mV deviation - maintains sensor SNR during rapid imaging cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8715EUA-T | Higher current capability (2.4A/0.15Ω MOSFET), lower RCS (0.20–0.43 V/A), same pinout and package | Better suited for >200mA loads at 9V output; requires adjusted loop compensation due to higher transconductance | Select MAX8715EUA-T when output current exceeds 200mA or lower RDS(on) is needed for thermal margin. |
| TPS61040DRVR | Fixed 500kHz frequency, no FREQ pin; 28V VOUT max; 0.5A switch; different pinout (6-pin WSON) | Lacks frequency selection and soft-start programmability; requires redesign of compensation and layout | Choose TPS61040DRVR only for cost-sensitive, low-current (<150mA), fixed-frequency applications where µMAX footprint is not required. |
Compared with MAX1790EUA-T, MAX8715EUA-T delivers higher output current with identical pin compatibility and layout reuse, while TPS61040DRVR offers lower cost but mandates PCB redesign, loss of soft-start control, and reduced feature set - making MAX1790EUA-T optimal for precision, low-profile, and programmable display power designs.
Availability
MAX1790EUA-T is available at Aetrix Electronics and suitable for LCD display bias supplies, PCMCIA card power management, and portable medical device power rails requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX1790EUA-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, mixed-signal, and power-management ICs for demanding industrial, automotive, and portable applications.
The MAX1790EUA-T belongs to Maxim's low-noise step-up DC-DC converter product line, engineered specifically for ultra-thin display power systems where height, efficiency, and transient response are critical constraints.
FAQ
What is the maximum output voltage supported by the MAX1790EUA-T?
The MAX1790EUA-T supports an adjustable output voltage range from the input voltage (VIN) up to 12V. This is achieved using an external resistor divider connected to the FB pin, referenced to the internal 1.24V feedback voltage. The datasheet confirms operation up to 12V under typical conditions with proper component selection and thermal management - exceeding this risks violating absolute maximum ratings on the LX pin.
Does the MAX1790EUA-T require an external catch diode?
Yes, the MAX1790EUA-T requires an external Schottky catch diode connected between LX and VOUT. The IC integrates only the n-channel MOSFET switch; the diode completes the boost power path during the off-time. Recommended parts include MBRS130LT1 or ZHCS1000, selected for low forward voltage and fast recovery to maintain efficiency and minimize voltage spikes.
How is the switching frequency selected on the MAX1790EUA-T?
The switching frequency of the MAX1790EUA-T is selected via the FREQ pin: connect FREQ to GND for 640kHz operation or to IN for 1.2MHz operation. The pin has an internal 5µA pulldown, so leaving it unconnected defaults to 640kHz. This selection directly affects inductor size, output ripple, and EMI filter design - 1.2MHz enables smaller inductors but demands tighter layout for EMI control.
Can the MAX1790EUA-T be used in SEPIC topology?
Yes, the MAX1790EUA-T can be configured in SEPIC topology, as demonstrated in Figure 3 of the datasheet. In this configuration, it converts a single Li+ cell (2.6V–4.2V) to a regulated 3.3V output, supporting both step-up and step-down behavior. Critical design elements include coupled inductors (L1A/L1B), low-ESR coupling capacitor, and adjusted compensation - the IC's current-mode control and external COMP pin enable stable SEPIC operation.
What is the purpose of the SS pin on the MAX1790EUA-T?
The SS (Soft-Start) pin on the MAX1790EUA-T controls inrush current during power-up by linearly ramping the peak inductor current limit from 0A to full scale. A capacitor connected to SS is charged at 4µA; full current limit is reached after t = 2.5 × 10⁵ × CSS. During shutdown, the capacitor discharges to GND. This prevents output overshoot and input rail collapse - a key requirement in multi-rail portable systems sharing a common battery source.
MAX1790EUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.6V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 1.2A (Switch)
- Frequency - Switching:
- 640kHz, 1.22MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX1790EUA-T FAQ
1.How can I place an order for MAX1790EUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1790EUA-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 MAX1790EUA-T reliable?
The price and inventory of MAX1790EUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1790EUA-T is usually 5 days.
3.What payment methods are accepted for MAX1790EUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1790EUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1790EUA-T?
MAX1790EUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1790EUA-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 MAX1790EUA-T?
For technical support, including MAX1790EUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1790EUA-T requirements.
6.How does Aetrix verify that MAX1790EUA-T is sourced from the original manufacturer or authorized distributors?
All MAX1790EUA-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 MAX1790EUA-T meets industry standards.
7.What is the process for return or replacement of MAX1790EUA-T?
All MAX1790EUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1790EUA-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 MAX1790EUA-T part is unused and in its original packaging.
Return procedure for MAX1790EUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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