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Analog Devices Inc./Maxim Integrated MAX1797EUA-T
- Part No.:
- MAX1797EUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1797EUA-T.pdf
- Description:
- IC REG BOOST ADJ 800MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,999
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Product details
Overview
The MAX1797EUA-T from Maxim Integrated is a high-efficiency, step-up DC-DC converter optimized for portable battery-powered devices. It delivers up to 1A output current with 95% peak efficiency, operates from as low as 0.7V input, and provides pin-selectable 3.3V or 5.0V output (or adjustable 2.0–5.5V via external resistors). Its True Shutdown™ circuit fully disconnects output from input during shutdown, enabling ultra-low 2μA shutdown current and eliminating need for external Schottky diodes - ideal for space-constrained handheld audio players and wireless handsets.
For engineers reviewing the MAX1797EUA-T datasheet, MAX1797EUA-T pinout, MAX1797EUA-T application, or MAX1797EUA-T equivalent, key selection criteria include its 1A current limit, 8-pin μMAX package (1.09mm height), integrated LX-damping for EMI reduction, active LBI/LBO comparator in shutdown, and synchronous rectification architecture that enables >95% efficiency at light loads without external diodes.
Technical Context
The MAX1797EUA-T employs a minimum-off-time, current-limited control scheme combining PWM-like high-power delivery with pulse-skipping ultra-low quiescent current (25μA). Its internal N-channel and P-channel MOSFETs feature RDS(ON) of 0.17Ω and 0.27Ω respectively, enabling high efficiency across wide load ranges. Switching frequency varies dynamically up to 500kHz depending on load and input voltage.
True Shutdown™ forces OUT into high-impedance state while maintaining LBI/LBO functionality; the proprietary LX-damping switch (RDAMP = 100–400Ω) actively dissipates inductor ring energy to suppress EMI. The device supports dual-mode feedback (FB tied to GND for 5V, to OUT for 3.3V) and includes a precision 1.24V feedback reference with <100nA input bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current Limit | 1A - sets maximum sustainable load for compact inductor selection (e.g., Sumida CDRH6D28-220) |
| Input Voltage Range | +0.7V to +5.5V - enables single-cell alkaline/NiMH operation down to near-dead battery voltage |
| Output Voltage Options | Preset 3.3V or 5.0V (via FB pin connection); adjustable 2.0–5.5V using external resistor divider |
| Quiescent Current | 25μA - minimizes no-load battery drain in always-on portable systems |
| Shutdown Current | 2μA - eliminates standby power path between BATT and OUT, critical for long shelf life |
| Peak Efficiency | 95% - achieved with synchronous rectification and low RDS(ON) MOSFETs, reducing thermal stress |
| Package | 8-pin μMAX (3.0mm × 3.0mm × 1.09mm) - half-size vs. SO-8, enabling ultra-thin handheld PCB layouts |
Pinout & Package
The MAX1797EUA-T is housed in an 8-pin μMAX package (3.0mm × 3.0mm × 1.09mm), optimized for low-profile portable designs. Pin 1 is marked by a dot; top-view orientation follows standard μMAX layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI | Low-battery comparator input | Monitors battery voltage with 0.85V threshold; remains active in shutdown to enable autonomous low-voltage cutoff |
| FB | Dual-mode feedback input | Selects preset 3.3V (FB→OUT) or 5.0V (FB→GND); or adjusts output via resistor divider (VFB = 1.24V) |
| LBO | Open-drain low-battery output | Sinks current when LBI > 0.85V; high-impedance otherwise; usable up to 6V regardless of VOUT |
| SHDN | Active-high shutdown control | Drives device into 2μA shutdown mode; OUT goes high-Z while LBI/LBO remain functional |
| GND | Analog/digital ground reference | Must be connected directly to solid ground plane within 5mm of input/output capacitor grounds |
| LX | Inductor switching node | Connects to inductor; incorporates damping switch to suppress ringing and reduce EMI emissions |
| OUT | Regulated power output | Provides bootstrap supply to IC; drives load and feedback network; high-Z in shutdown |
| BATT | Battery input & damping switch terminal | Accepts 0.7–5.5V input; internally connects to damping resistor during LX off-cycle |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Fully isolates OUT from BATT in shutdown, eliminating leakage paths and enabling true zero-load battery drain |
| Synchronous Rectification | Integrates N- and P-channel MOSFETs (RDS(ON) = 0.17Ω/0.27Ω) to replace external Schottky diode, saving board area and boosting light-load efficiency |
| LX-Damping Circuitry | On-chip damping switch (100–400Ω) actively quenches inductor ringing, reducing radiated EMI without affecting output ripple |
| Active LBI/LBO in Shutdown | Enables system-level battery monitoring and automatic shutdown sequencing even when DC-DC is disabled |
| Dual-Mode Feedback | Hardware-selectable 3.3V/5.0V outputs or precision-adjustable range (2.0–5.5V) using only two external resistors |
Applications
| Portable Digital Audio Players | Wireless Handsets |
|---|---|
Use Scenario: Powering 3.3V DSP, codec, and display from single 1.5V alkaline cell. IC Role / Device Role / Timing Role: Step-up regulator providing stable 3.3V rail with True Shutdown™ enabling instant-on/off and zero standby drain. Use Value: Extends playback time by >30% vs. diode-based boosters due to 95% efficiency and 25μA quiescent current. |
Use Scenario: Generating 5.0V USB charging rail from 3.6V Li-ion battery during OTG operation. IC Role / Device Role / Timing Role: High-current (1A) boost converter with LX damping to meet FCC radiated emission limits in RF-sensitive handset layout. Use Value: Eliminates need for external EMI filter components while delivering full 1A at 5V with <2μA shutdown leakage. |
| PDAs/Palmtops | Portable Terminals |
Use Scenario: Supplying 3.3V logic and 5.0V backlight from shared single-cell NiMH pack. IC Role / Device Role / Timing Role: Dual-voltage capable DC-DC with LBI comparator triggering graceful OS shutdown before brownout. Use Value: Single IC replaces two regulators and discrete low-battery detector, reducing BOM count and PCB area by 40%. |
Use Scenario: Powering 5.0V barcode scanner module from 2.4–3.6V industrial battery pack. IC Role / Device Role / Timing Role: Robust boost converter with 1A current limit and -40°C to +85°C operation for cold-chain logistics terminals. Use Value: Maintains regulated 5V output down to 0.7V input, enabling full scanner functionality until battery reaches end-of-life voltage. |
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 |
|---|---|---|---|
| TPS61040DRBT | 0.5A current limit, 28V max VOUT, no integrated LBI/LBO comparator | Lacks built-in battery monitor; requires external circuitry for low-battery detection | Choose when higher output voltage (>5.5V) is needed and system already implements battery monitoring |
| LT1930ES5#TRMPBF | 1.2A current limit, 600kHz fixed frequency, no True Shutdown™ (output not disconnected) | Higher EMI due to fixed-frequency operation; no output isolation in shutdown | Prefer when predictable switching frequency simplifies EMI filtering and output leakage is acceptable |
Compared with TPS61040DRBT and LT1930ES5#TRMPBF, the MAX1797EUA-T uniquely combines 1A capability, integrated battery monitoring, True Shutdown™ output isolation, and LX damping - making it optimal for space-constrained, battery-critical portable devices requiring minimal external components and ultra-low standby drain.
Availability
The MAX1797EUA-T is available at Aetrix Electronics and suitable for portable digital audio players, wireless handsets, and PDAs requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for MAX1797EUA-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and portable applications.
The MAX1797EUA-T belongs to Maxim's low-quiescent-current step-up DC-DC converter family, designed specifically for battery-powered handheld devices where startup from sub-1V inputs, ultra-low shutdown current, and EMI-controlled switching are critical system requirements.
FAQ
What is the minimum input voltage required to start up the MAX1797EUA-T?
The MAX1797EUA-T guarantees startup from +0.85V at +25°C with a 3kΩ load, and operates continuously down to +0.7V after startup. This enables reliable operation from nearly depleted single-cell alkaline or NiMH batteries, extending usable battery life in portable devices powered by the MAX1797EUA-T.
How does the MAX1797EUA-T achieve 95% peak efficiency without an external Schottky diode?
The MAX1797EUA-T integrates synchronous rectification using internal N-channel and P-channel MOSFETs (RDS(ON) = 0.17Ω and 0.27Ω) to replace the lossy external Schottky diode. This reduces conduction losses significantly, especially at light loads, enabling 95% peak efficiency while eliminating board space and cost associated with the discrete diode - a core advantage of the MAX1797EUA-T design.
Can the MAX1797EUA-T output voltage be adjusted beyond the preset 3.3V and 5.0V options?
Yes, the MAX1797EUA-T supports adjustable output from +2.0V to +5.5V using a resistive voltage divider from OUT to FB to GND. With a precise 1.24V feedback reference and <100nA input bias current, external resistor values up to 250kΩ can be used - allowing accurate, low-power voltage setting without loading the battery, a key capability of the MAX1797EUA-T.
What is the function of the LX-damping circuitry in the MAX1797EUA-T?
The MAX1797EUA-T's LX-damping circuitry activates an internal switch across the inductor during off-time to dissipate residual ring energy, suppressing high-frequency oscillations at the LX node. This reduces radiated EMI without increasing output ripple - a critical feature for noise-sensitive applications like wireless handsets where the MAX1797EUA-T is commonly deployed.
Does the LBI/LBO comparator remain operational when the MAX1797EUA-T is in shutdown mode?
Yes, the LBI/LBO comparator remains fully active during shutdown, drawing only nanoamps of current. This allows the MAX1797EUA-T to monitor battery voltage and assert LBO (open-drain) even when the main DC-DC converter is disabled - enabling autonomous low-battery shutdown sequences in portable systems powered by the MAX1797EUA-T.
MAX1797EUA-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:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for MAX1797EUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1797EUA-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 MAX1797EUA-T reliable?
The price and inventory of MAX1797EUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1797EUA-T is usually 5 days.
3.What payment methods are accepted for MAX1797EUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1797EUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1797EUA-T?
MAX1797EUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1797EUA-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 MAX1797EUA-T?
For technical support, including MAX1797EUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1797EUA-T requirements.
6.How does Aetrix verify that MAX1797EUA-T is sourced from the original manufacturer or authorized distributors?
All MAX1797EUA-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 MAX1797EUA-T meets industry standards.
7.What is the process for return or replacement of MAX1797EUA-T?
All MAX1797EUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1797EUA-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 MAX1797EUA-T part is unused and in its original packaging.
Return procedure for MAX1797EUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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