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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:434
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Product details
Overview
MAX1797EUA+ from Maxim Integrated is a high-efficiency, step-up DC-DC converter optimized for low-input-voltage portable systems. It delivers up to 550mA at 3.3V (or 370mA at 5.0V) from input as low as 0.7V, features True Shutdown™ with 2μA shutdown current, integrated synchronous rectification, and LX-damping circuitry for EMI reduction - used in wireless handsets and portable terminals requiring compact, battery-efficient power conversion.
For engineers reviewing the MAX1797EUA+ datasheet, MAX1797EUA+ pinout, MAX1797EUA+ application, or MAX1797EUA+ equivalent, this page provides verified technical context, validated pin functions, confirmed output current limits (1A switch limit), real-world efficiency curves (up to 95%), and precise alternative selection guidance for portable power design.
Technical Context
The MAX1797EUA+ employs a minimum-off-time, current-limited control architecture combining PWM-like efficiency with pulse-skipping quiescent current benefits - enabling 25μA operating current and load-dependent switching up to 500kHz. Its internal N-channel and P-channel MOSFETs feature RDS(ON) of 0.17Ω and 0.27Ω respectively, supporting high-efficiency synchronous rectification without external diodes.
True Shutdown™ fully disconnects OUT from BATT during shutdown, placing OUT in high-impedance state while maintaining LBI/LBO comparator operation. The integrated LX-damping switch (RDAMP = 100–400Ω) suppresses inductor ringing to reduce EMI without affecting output ripple amplitude.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current Limit | 1A NFET switch current limit - enables robust 400–550mA steady-state output at 3.3V/5.0V under typical conditions |
| Input Voltage Range | +0.7V to +5.5V - supports single-cell alkaline/NiMH start-up from 0.85V and operation down to near-dead battery |
| Efficiency | Up to 95% - achieved via synchronous rectification and low RDS(ON) MOSFETs, reducing thermal load and board area |
| Quiescent Current | 25μA - minimizes no-load battery drain in always-on portable devices |
| Shutdown Current | 2μA - eliminates parasitic discharge path between input and output during sleep mode |
| Feedback Reference | 1.24V ±0.04V - enables precise adjustable output from 2.0V to 5.5V using external resistor divider |
| Package | 8-pin μMAX (3.0mm × 3.0mm × 1.09mm) - half-size vs. SO-8, suitable for space-constrained handheld PCBs |
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), rated for -40°C to +85°C operation and 330mW power dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LBI | Low-battery comparator input | Monitors input voltage; trips at 0.85V (±25mV hysteresis); remains active in shutdown |
| 2 - FB | Feedback input / output voltage select | Connect to GND for 5.0V, to OUT for 3.3V, or to resistor divider for 2.0–5.5V adjustable output |
| 3 - LBO | Open-drain low-battery output | Sinks current when LBI > 0.85V; high-impedance otherwise; functional in shutdown |
| 4 - SHDN | Active-low shutdown control | Pull high (>0.8×VBATT) to enter shutdown; pulls OUT to high-Z and reduces supply current to 2μA |
| 5 - GND | Power and signal ground | Primary return path for LX, OUT, and internal circuits; must be low-impedance connection to ground plane |
| 6 - LX | Inductor switch node | Drives external inductor; integrates damping switch to suppress ringing and reduce EMI |
| 7 - OUT | Regulated power output | Provides bootstrap power to IC; supplies up to 550mA at 3.3V; high-Z in shutdown |
| 8 - BATT | Battery input / damping switch connection | Accepts 0.7–5.5V input; connects internally to damping switch that clamps LX ring-down energy |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Fully disconnects OUT from BATT in shutdown - eliminates need for external blocking FET or Schottky diode |
| Synchronous rectification | Integrated PFET replaces external Schottky diode - improves efficiency by ~5–10% and saves board space |
| LX-damping circuitry | On-chip damping switch (100–400Ω) actively dissipates inductor ring-down energy - reduces EMI without increasing output ripple |
| LBI/LBO comparator in shutdown | Enables autonomous low-battery detection and system-level shutdown sequencing without waking main controller |
| Adjustable output via FB pin | Supports 2.0–5.5V output using two external resistors - reference voltage fixed at 1.24V ±0.04V for precision regulation |
Applications
| Portable Digital Audio Players | Wireless Handsets |
|---|---|
Use Scenario: Powering 3.3V audio DACs and RF front-ends from single-cell alkaline or NiMH batteries. IC Role / Device Role / Timing Role: Step-up regulator providing stable 3.3V rail with <25μA quiescent current during playback pause. Use Value: Extends battery life by eliminating external diode losses and enabling deep-sleep shutdown with 2μA current draw. |
Use Scenario: Generating 5.0V bias for power amplifier modules in GSM/EDGE handsets with fading battery voltage. IC Role / Device Role / Timing Role: High-current boost converter delivering 370mA at 5.0V from 0.9–1.8V input during transmit bursts. Use Value: Sustains RF output power across full battery discharge curve due to 0.7V minimum input operation and 1A switch limit. |
| PDAs/Palmtops | Portable Terminals |
Use Scenario: Supplying 3.3V logic rails and backlight drivers in pen-based computing devices with intermittent usage. IC Role / Device Role / Timing Role: Primary system power converter with LBI monitoring to trigger graceful OS shutdown before brownout. Use Value: Prevents data corruption via early low-battery warning (0.85V threshold) while maintaining regulation until final discharge. |
Use Scenario: Powering 5.0V smart-card readers and 3.3V microcontrollers in handheld inventory scanners. IC Role / Device Role / Timing Role: Dual-output-capable regulator (via FB configuration) supporting both logic and peripheral voltage requirements. Use Value: Reduces BOM count by replacing separate 3.3V/5.0V regulators - simplifies layout and lowers cost in volume production. |
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 |
|---|---|---|---|
| TPS61022DRCT | Higher 2A switch limit, 2.5V–5.5V input, but requires external diode; 12μA quiescent current vs. MAX1797EUA+'s 25μA | Preferred for higher-current loads (>600mA) where external diode is acceptable; lacks integrated LBI/LBO comparator | Select TPS61022DRCT when output current exceeds 550mA or when wider input range (2.5V min) is required |
| LT1930ES5#TRMPBF | Fixed 5V output only, 1.5A switch limit, 1.5V–10V input, no LBI/LBO, 100μA quiescent current | Suitable for fixed 5V systems with higher input voltage; not viable for sub-1V start-up or low-power shutdown scenarios | Choose LT1930ES5#TRMPBF only for fixed 5V applications with VBATT ≥1.5V and where 2μA shutdown is not required |
Compared with TPS61022DRCT and LT1930ES5#TRMPBF, MAX1797EUA+ uniquely combines sub-1V start-up, integrated low-battery monitoring, true output disconnect in shutdown, and ultra-low 2μA shutdown current - making it optimal for long-life, single-cell portable devices where autonomy and reliability are critical.
Availability
MAX1797EUA+ is available at Aetrix Electronics and suitable for portable digital audio players, wireless handsets, and portable terminals requiring stable component supply, consistent parametric performance across temperature, and long-term lifecycle support.
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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and portable applications.
The MAX1795/MAX1796/MAX1797 family was engineered specifically for ultra-low-voltage, high-efficiency boost conversion in battery-powered handheld devices - emphasizing minimal quiescent current, integrated protection, and compact packaging.
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 capability enables reliable operation from nearly depleted single-cell alkaline or NiMH batteries, a key requirement for portable audio and communication devices where extended runtime is critical. The startup voltage exhibits a -2.2mV/°C tempco.
How does the True Shutdown™ feature of the MAX1797EUA+ improve system power management?
True Shutdown™ in the MAX1797EUA+ fully disconnects the output (OUT) from the input (BATT) during shutdown, placing OUT in a high-impedance state and reducing total supply current to just 2μA. Unlike conventional boost converters that maintain a DC path through the inductor and diode, this eliminates parasitic discharge - preserving battery charge during extended idle periods in handheld devices.
Can the MAX1797EUA+ generate both 3.3V and 5.0V outputs, and how is the output voltage selected?
Yes, the MAX1797EUA+ supports both 3.3V and 5.0V preset outputs: connect FB to OUT for 3.3V, or to GND for 5.0V. For adjustable outputs from 2.0V to 5.5V, use a resistor divider from OUT to FB to GND. The internal feedback reference is precisely 1.24V ±0.04V, enabling accurate regulation without trimming components.
What is the role of the LBI and LBO pins on the MAX1797EUA+, and do they function in shutdown mode?
The LBI pin is the low-battery comparator input with a factory-trimmed 0.85V threshold (±25mV hysteresis); LBO is its open-drain output. Critically, both remain fully operational during shutdown - allowing the host system to monitor battery health and initiate controlled shutdown sequences even when the main power rail is disabled. This ensures data integrity and prevents unexpected resets.
What package type and dimensions does the MAX1797EUA+ use, and what are its thermal limitations?
The MAX1797EUA+ uses an 8-pin μMAX package measuring 3.0mm × 3.0mm × 1.09mm - approximately half the footprint of an SO-8. Its continuous power dissipation is rated at 330mW at +70°C ambient, derating by 4.1mW/°C above that. The junction temperature must not exceed +150°C, and the device is specified for operation from -40°C to +85°C.
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:
- Active
- 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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