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Analog Devices Inc./Maxim Integrated MAX1790EUA+
- Part No.:
- MAX1790EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1790EUA+.pdf
- Description:
- IC REG BST SEPIC ADJ 1.2A 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,682
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Product details
Overview
MAX1790EUA+ from Maxim Integrated is a high-efficiency, current-mode, fixed-frequency step-up DC-DC converter with integrated 1.6A/0.21Ω n-channel MOSFET, 1.2MHz/640kHz selectable switching frequency, and 2.6V–5.5V input range. It delivers up to 12V output from low-voltage sources and is optimized for space-constrained portable LCD power supplies.
For engineers reviewing the MAX1790EUA+ datasheet, MAX1790EUA+ pinout, MAX1790EUA+ application, or MAX1790EUA+ equivalent, key selection criteria include programmable soft-start timing, external compensation flexibility for ceramic output capacitors, shutdown current of 0.1µA, and µMAX package height under 1.1mm - all critical for handheld display power integrity and thermal management.
Technical Context
The MAX1790EUA+ employs a current-mode PWM architecture with slope compensation to ensure stability at high duty cycles (up to 92% at 640kHz). Its error amplifier (transconductance gm = 70–260µS, VFB = 1.24V ±1.5%) directly controls peak inductor current via the COMP pin, enabling fast transient response and cycle-skipping at light loads.
Switching frequency is selected by FREQ pin logic level (GND = 640kHz, IN = 1.2MHz), and the internal 0.21Ω MOSFET supports up to 1.6A current limit (typ) with 0.30–0.65V/A current-sense transresistance (RCS). Soft-start is externally programmable via CSS capacitor charged at 4µA, with full current limit reached after t = 2.5×10⁵·CSS seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 5.5V - enables direct operation from single Li⁺ cell or 3.3V rail without pre-regulation. |
| Output Voltage Range | Adjustable from VIN to 12V - supports common display bias rails (5V, 9V, 12V) using resistor divider on FB pin. |
| Switching Frequency | 640kHz or 1.2MHz (pin-selectable) - allows trade-off between inductor size (smaller at 1.2MHz) and EMI filtering ease (lower freq). |
| Integrated MOSFET | 1.6A current limit, 0.21Ω RON (max 0.5Ω) - reduces external component count and conduction losses in compact layouts. |
| Shutdown Current | 0.1µA (max 10µA) - preserves battery life in always-on portable systems during deep sleep modes. |
| Feedback Reference | 1.24V ±1.5% (VFB) - ensures ±1.2% output voltage accuracy over temperature and line variation with proper resistor tolerance. |
| Soft-Start Control | External capacitor (CSS) charged at 4µA - enables controlled inrush current limiting and prevents output overshoot during power-up. |
Pinout & Package
MAX1790EUA+ is housed in an 8-pin µMAX® package (3.0mm × 3.0mm × 1.1mm max height), lead-free and RoHS-compliant. The ultra-low profile supports thin handheld and LCD module designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Error amplifier compensation node | Connect series RC network to GND to stabilize feedback loop; sets integrator zero and high-frequency gain for transient response. |
| 2 - FB | Feedback input | Monitors output voltage via resistor divider; internal 1.24V reference enables precise output regulation (VOUT = 1.24V × (1 + R₁/R₂)). |
| 3 - SHDN | Shutdown control input | Logic-low disables regulator and reduces supply current to 0.1µA; internal pull-down ensures default-off behavior if left floating. |
| 4 - GND | Analog and power ground | Common reference for all internal circuitry; must be connected to low-impedance star ground point near LX and IN pins. |
| 5 - LX | Switch node | Connects to inductor and catch diode anode; high dV/dt node requiring short, wide trace to minimize EMI and switching losses. |
| 6 - IN | Input supply | Accepts 2.6V–5.5V input; requires ≥1µF ceramic bypass capacitor placed directly between IN and GND for high-frequency noise suppression. |
| 7 - FREQ | Frequency select input | Driven low → 640kHz; driven high → 1.2MHz; internal 5µA pulldown allows unconnected default to 640kHz mode. |
| 8 - SS | Soft-start control | Charged at 4µA to 0.5V–1.5V range; linearly scales peak inductor current from 0A to full limit during startup. |
Key Features
| Feature | Design Value |
|---|---|
| 90% peak efficiency | Enables minimal thermal rise in sealed portable enclosures and extends battery runtime in handheld devices. |
| Programmable soft-start | Prevents inrush current spikes and output overshoot during power-up, protecting downstream display drivers and capacitors. |
| External loop compensation | Allows optimization for low-ESR ceramic output capacitors (e.g., 3×3.3µF), reducing solution height below 1.1mm. |
| Ultra-small µMAX package | 3.0mm × 3.0mm footprint with 1.1mm max height - fits within tight AMLCD module spacing constraints. |
| Low-noise step-up architecture | Current-mode control with slope compensation minimizes output voltage ripple and improves load transient response (<100µs settling). |
Applications
| AMLCD Panel Power Supply | PCMCIA Card Boost Regulator |
|---|---|
|
Use Scenario: Powering TFT-LCD gate/source drivers requiring stable 9V, 12V, or -9V rails from 3.3V host bus. IC Role / Device Role / Timing Role: Primary step-up controller generating main positive bias rail with fast transient response to pixel charging demands. Use Value: Achieves <1.1mm total solution height and <100µs load-step recovery - critical for slim notebook displays and embedded panels. |
Use Scenario: Providing regulated 5V or 12V from 3.3V PCMCIA slot for legacy peripherals (modems, flash cards). IC Role / Device Role / Timing Role: Compact, self-contained boost converter eliminating need for external MOSFET and gate driver. Use Value: 0.1µA shutdown current and 640kHz/1.2MHz frequency select enable compliance with PCMCIA power budget and EMI limits. |
| Handheld Medical Display | Portable Barcode Scanner |
|
Use Scenario: Driving monochrome or color LCD backlights and interface logic in battery-powered diagnostic tools. IC Role / Device Role / Timing Role: High-efficiency DC-DC source for display bias and microcontroller I/O rails with programmable soft-start. Use Value: 90% efficiency at 200mA and 1.6A MOSFET support extend single-cell Li⁺ battery life beyond 8 hours per charge. |
Use Scenario: Generating 5V for laser diode driver and image sensor from 3.0–3.6V Li-ion battery in handheld scanners. IC Role / Device Role / Timing Role: Low-noise, fast-response boost regulator ensuring stable sensor power during rapid trigger events. Use Value: Cycle-skipping light-load mode and 0.1µA shutdown reduce quiescent drain, enabling >1-year shelf life in inventory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8715EUA+ | Higher 2.4A current limit, lower 0.15Ω RON, same pinout and package - but higher quiescent current (2.5–5mA vs. 0.35mA typ for MAX1790). | Preferred for >200mA continuous loads (e.g., larger AMLCD panels); less suitable for ultra-low-power standby scenarios. | Select MAX8715EUA+ when output current demand exceeds 200mA and thermal headroom allows higher IQ. |
| TPS61040DRVR | 3.6V max input, 28V max output, 0.5A switch, no external compensation - fixed internal compensation, smaller 6-pin SOT-23 package. | Better suited for simple, low-cost 5V boost from 3.3V; lacks programmable soft-start and flexible loop tuning for demanding display rails. | Choose TPS61040DRVR only for cost-sensitive, low-current applications where layout simplicity outweighs precision regulation needs. |
Compared with MAX8715EUA+, MAX1790EUA+ offers lower quiescent current and sufficient 1.6A capability for most handheld LCDs; versus TPS61040DRVR, it provides superior transient response, external compensation, and wider input range - making it optimal for high-reliability, multi-rail portable display power.
Availability
MAX1790EUA+ is available at Aetrix Electronics and suitable for LCD displays, PCMCIA cards, and hand-held medical devices requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for MAX1790EUA+ 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 industrial, automotive, and portable applications.
The MAX1790EUA+ belongs to Maxim's low-noise step-up DC-DC converter product line, designed specifically for compact, high-efficiency bias rail generation in space- and power-constrained portable displays and embedded systems.
FAQ
What is the maximum output voltage achievable with the MAX1790EUA+?
The MAX1790EUA+ 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, where VOUT = 1.24V × (1 + R1/R2). The device maintains regulation and efficiency up to 12V across its full operating temperature range (-40°C to +85°C), as confirmed in the Electrical Characteristics table and Typical Operating Characteristics plots.
Does the MAX1790EUA+ require external compensation components?
Yes, the MAX1790EUA+ requires external compensation components connected to the COMP pin: a series RC network (RCOMP and CCOMP) plus an optional second capacitor (CCOMP2) to cancel ESR zero. These components are mandatory for loop stability and optimal transient response - especially when using low-ESR ceramic output capacitors. Table 1 in the datasheet provides experimentally verified values for common configurations like 3.3V→12V and 3.3V→5V.
Can the MAX1790EUA+ operate from a single Li⁺ cell?
Yes, the MAX1790EUA+ is explicitly designed for single Li⁺ cell operation, with a minimum input voltage of 2.6V and full functionality down to -40°C. Its undervoltage lockout (UVLO) activates below 2.25V (rising), ensuring reliable startup and shutdown across the entire Li⁺ discharge curve (4.2V → ~2.7V). This makes MAX1790EUA+ ideal for handheld devices where battery voltage varies significantly during use.
What is the purpose of the SS pin on the MAX1790EUA+?
The SS (soft-start) pin on the MAX1790EUA+ controls inrush current during power-up by linearly ramping the peak inductor current from 0A to full limit. A capacitor (CSS) connected to SS is charged at a constant 4µA, producing a controlled startup time of t = 2.5×10⁵·CSS seconds. This prevents output overshoot and stress on output capacitors - a critical feature for driving sensitive LCD bias rails and avoiding display artifacts.
Is the MAX1790EUA+ pin-compatible with the MAX8715EUA+?
Yes, the MAX1790EUA+ and MAX8715EUA+ share identical pinout, package (8-pin µMAX), and functional block diagram. They differ only in internal MOSFET specifications: MAX1790EUA+ has 1.6A/0.21Ω, while MAX8715EUA+ has 2.4A/0.15Ω. This allows direct substitution in existing layouts when higher output current is needed - though designers must verify that the higher quiescent current (2.5–5mA vs. 0.35mA) of MAX8715EUA+ meets system standby requirements.
MAX1790EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX1790EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1790EUA+ 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+ reliable?
The price and inventory of MAX1790EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1790EUA+ is usually 5 days.
3.What payment methods are accepted for MAX1790EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1790EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1790EUA+?
MAX1790EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1790EUA+ 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+?
For technical support, including MAX1790EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1790EUA+ requirements.
6.How does Aetrix verify that MAX1790EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX1790EUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1790EUA+?
All MAX1790EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1790EUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX1790EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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