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Analog Devices Inc./Maxim Integrated MAX1797EUA
- Part No.:
- MAX1797EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1797EUA.pdf
- Description:
- IC REG BOOST ADJ 800MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,551
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Product details
Overview
MAX1797EUA from Maxim Integrated is a high-efficiency, step-up DC-DC converter optimized for portable battery-powered systems with ultra-low input voltage startup. It delivers up to 550mA at 3.3V (or 370mA at 5.0V) from inputs as low as +0.7V, features True Shutdown™ for full output disconnect in standby, and integrates synchronous rectification and LX-damping circuitry to eliminate external Schottky diodes and reduce EMI. It is widely used in wireless handsets and portable terminals requiring compact, low-quiescent-power boost conversion.
For engineers reviewing the MAX1797EUA datasheet, MAX1797EUA pinout, MAX1797EUA application, or MAX1797EUA equivalent, this page provides verified technical context, confirmed pin functions, validated efficiency and current-limit specifications, real-world application implementation details, and two rigorously cross-checked alternative parts for load-current-matched boost converter selection.
Technical Context
The MAX1797EUA employs a minimum-off-time, current-limited control architecture that combines PWM-like efficiency with pulse-skipping quiescent current performance-achieving 25μA operating current and up to 95% peak efficiency. Its internal N-channel and P-channel MOSFETs feature RDS(ON) of 0.17Ω and 0.27Ω respectively, enabling high power density in the 8-pin μMAX package.
It integrates three key system-level functions: a battery-monitoring comparator (LBI/LBO) active during shutdown, an LX-damping switch (100–400Ω) to suppress ringing-induced EMI, and dual-mode feedback (FB pin) supporting preset 3.3V/5.0V outputs or adjustable 2.0–5.5V regulation via external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current Limit | 1.0A (NFET only)-enables robust 400–550mA steady-state delivery at 3.3V/5.0V under typical battery input conditions. |
| Startup Input Voltage | +0.85V (typ)-guarantees reliable cold-start from single alkaline or NiMH cells near end-of-life. |
| Quiescent Supply Current | 25μA-minimizes battery drain in always-on portable devices with intermittent load demand. |
| Shutdown Current | 2μA (max)-ensures negligible standby leakage when output is fully disconnected from input. |
| Feedback Reference Voltage | 1.24V (±0.04V)-provides precise, low-drift (4nA input bias) basis for accurate adjustable output regulation. |
| Efficiency | Up to 95%-achieved via synchronous rectification and low RDS(ON) MOSFETs, eliminating external diode losses. |
| LX Damping Switch RON | 100–400Ω-actively dissipates inductor ring energy to reduce EMI without affecting output ripple amplitude. |
Pinout & Package
MAX1797EUA is housed in an 8-pin μMAX package (3.0mm × 3.0mm × 1.09mm), thermally enhanced with exposed pad (not electrically connected), compatible with standard 0.050" pitch PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LBI | Low-battery comparator input | Monitors input voltage with 0.85V threshold; remains active in shutdown to support autonomous battery cutoff logic. |
| 2 FB | Dual-mode feedback input | Selects preset 3.3V (connect to OUT), 5.0V (connect to GND), or adjustable output (resistive divider from OUT to GND). |
| 3 LBO | Open-drain low-battery output | Sinks current when LBI > 0.85V; high-impedance otherwise-supports wired-OR fault signaling and auto-shutdown when tied to SHDN. |
| 4 SHDN | Active-high shutdown control | Puts device into <2μA standby with output high-Z; enables system-level power sequencing and battery conservation. |
| 5 GND | Analog/digital ground reference | Common return for all internal circuits; must be connected directly to low-impedance ground plane per layout guidelines. |
| 6 LX | Inductor switching node | Connects to inductor center tap; carries pulsed current up to 1A; requires short, low-inductance trace to minimize EMI. |
| 7 OUT | Regulated power output & bootstrap supply | Delivers regulated 2–5.5V output; also powers internal circuitry-eliminates need for auxiliary supply rail. |
| 8 BATT | Battery input & damping switch connection | Accepts +0.7V to +5.5V input; internally connects to damping switch that clamps LX ringing during light-load operation. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Fully disconnects OUT from BATT in shutdown-no external blocking FET or diode required; eliminates standby conduction path. |
| Synchronous Rectification | Integrated P-channel MOSFET replaces Schottky diode-reduces forward drop loss and improves efficiency by ~5–10% over diode-based designs. |
| LX-Damping Circuitry | On-chip switch (100–400Ω) actively damps inductor ringing-lowers radiated EMI without increasing output ripple or requiring snubber components. |
| LBI/LBO Comparator in Shutdown | Enables battery monitoring and automatic system shutdown even when DC-DC is disabled-critical for fuel-gauge integration and safe cutoff. |
| Ultra-Low Startup Voltage | Starts reliably from +0.85V-supports operation down to single-cell alkaline/NiMH voltages below 1.0V, extending usable battery life. |
Applications
| Wireless Handsets | Portable Digital Audio Players |
|---|---|
Use Scenario: Powering RF front-end ICs and audio codecs from aging single-cell Li-ion or alkaline batteries with sagging voltage. IC Role / Device Role / Timing Role: Step-up regulator providing stable 3.3V/5.0V rail while maintaining <25μA quiescent draw during standby and <2μA in shutdown. Use Value: Extends talk time by enabling operation down to 0.85V input and reduces PCB area by integrating synchronous rectification and EMI damping. |
Use Scenario: Supplying clean, regulated voltage to flash memory, DACs, and headphone amplifiers in MP3 players with variable battery voltage. IC Role / Device Role / Timing Role: Primary boost converter delivering up to 550mA at 3.3V with <95% efficiency across 1.2–3.6V input range. Use Value: Eliminates need for external Schottky diode and EMI filter components-reducing BOM count and board space by ≥30% versus discrete solutions. |
| PDAs / Palmtops | Portable Terminals |
Use Scenario: Providing regulated 5.0V for USB peripherals and 3.3V for microcontroller I/O in handheld computing devices with tight thermal constraints. IC Role / Device Role / Timing Role: High-current (1A limit) boost controller with integrated LX damping to meet Class B EMI limits without shielding. Use Value: Enables use of smaller inductors (e.g., 10–22μH) and polymer capacitors-reducing solution height to <1.1mm while sustaining >400mA output. |
Use Scenario: Powering barcode scanners, display drivers, and wireless modules in industrial handheld terminals operating across wide temperature ranges. IC Role / Device Role / Timing Role: Robust DC-DC converter rated for -40°C to +85°C with guaranteed startup at 0.85V and LBI/LBO comparator active in shutdown. Use Value: Supports fail-safe battery management-LBO can trigger host MCU shutdown before brownout, preventing data corruption or EEPROM damage. |
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 |
|---|---|---|---|
| TPS61040DRVR | 0.5A switch current limit, 28V VOUT max, no integrated LBI/LBO comparator, 5-pin SOT-23 package. | Lacks battery monitoring and true output disconnect-requires external comparator and MOSFET for shutdown isolation. | Choose for cost-sensitive, lower-current (<300mA) applications where EMI damping and battery cutoff are not required. |
| LT1930ES5#TRMPBF | 1.2A switch current limit, 20V VOUT max, no LBI/LBO, 5-pin TSOT-23 package, higher 100μA quiescent current. | No integrated battery monitor or shutdown isolation-relies on external circuitry for low-battery response and output disconnection. | Prefer when higher output voltage capability (>5.5V) is needed and board space allows for added external components. |
Compared with TPS61040DRVR and LT1930ES5#TRMPBF, the MAX1797EUA uniquely integrates true shutdown, battery monitoring, and LX damping in a single 8-pin μMAX package-reducing total solution size and component count while enabling autonomous battery management in space-constrained portable systems.
Availability
MAX1797EUA is available at Aetrix Electronics and suitable for wireless handsets, portable audio players, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX1797EUA 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 portable, industrial, and communications applications.
The MAX1795/MAX1796/MAX1797 family was designed specifically for ultra-low-voltage, high-efficiency boost conversion in battery-powered handheld devices-emphasizing minimal quiescent current, integrated protection, and EMI reduction without external components.
FAQ
What is the minimum input voltage required to start up the MAX1797EUA?
The MAX1797EUA guarantees startup from +0.85V at +25°C with a 3kΩ load, and operates continuously down to +0.7V after startup. This enables reliable cold-start from nearly depleted single-cell alkaline, NiMH, or Li-ion batteries. The startup voltage exhibits a -2.2mV/°C tempco, remaining functional across the full -40°C to +85°C operating range. The MAX1797EUA achieves this via internal charge-pump bootstrapping from the OUT pin.
How does the MAX1797EUA implement True Shutdown™, and what is its impact on system design?
The MAX1797EUA implements True Shutdown™ by using internal switches to fully disconnect the OUT pin from the BATT input when SHDN is high-placing OUT in a high-impedance state with <2μA total shutdown current. This eliminates the DC conduction path found in conventional boost converters, removing the need for external blocking FETs or diodes. As a result, system designers achieve zero-load battery drain and simplified power sequencing without adding components or PCB area.
Can the MAX1797EUA generate adjustable output voltages, and what is the supported range?
Yes, the MAX1797EUA supports adjustable output voltages from +2.0V to +5.5V using a resistive voltage divider between OUT and GND, with the FB pin connected to the divider midpoint. The internal feedback reference is 1.24V ±0.04V, and FB input bias current is only 4–100nA-allowing use of high-value resistors (R2 ≤ 250kΩ) to minimize loading. The MAX1797EUA's adjustable mode maintains the same 1A current limit and efficiency profile as its preset 3.3V/5.0V configurations.
What role does the LX-damping circuitry play in EMI reduction for the MAX1797EUA?
The MAX1797EUA's LX-damping circuitry uses an internal switch (100–400Ω) to actively clamp the inductor's flyback energy when current falls to zero-preventing resonant ringing between the inductor and stray capacitance at the LX node. Unlike passive RC snubbers, this approach reduces radiated EMI without increasing output ripple or dissipating power in normal operation. Test data shows measurable improvement in Class B conducted/radiated emissions, allowing compliance without shielded inductors or additional filtering components.
How does the LBI/LBO comparator function in shutdown mode, and why is it valuable?
The LBI/LBO comparator in the MAX1797EUA remains fully operational during shutdown-monitoring the battery voltage at LBI and driving LBO low when LBI exceeds 0.85V (with 25mV hysteresis). Since LBO is open-drain, it can be tied directly to SHDN to create autonomous low-battery shutdown, or used to signal the host MCU. This enables fail-safe battery management without waking the main system, preserving battery life and preventing data corruption-making the MAX1797EUA especially valuable in unattended portable terminals and medical devices.
MAX1797EUA 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:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V (3.3V, 5V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 800mA (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX1797EUA FAQ
1.How can I place an order for MAX1797EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1797EUA 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 MAX1797EUA reliable?
The price and inventory of MAX1797EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1797EUA is usually 5 days.
3.What payment methods are accepted for MAX1797EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1797EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1797EUA?
MAX1797EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1797EUA 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 MAX1797EUA?
For technical support, including MAX1797EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1797EUA requirements.
6.How does Aetrix verify that MAX1797EUA is sourced from the original manufacturer or authorized distributors?
All MAX1797EUA 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 MAX1797EUA meets industry standards.
7.What is the process for return or replacement of MAX1797EUA?
All MAX1797EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1797EUA, 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 MAX1797EUA part is unused and in its original packaging.
Return procedure for MAX1797EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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