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Analog Devices Inc./Maxim Integrated MAX1835EUT-T
- Part No.:
- MAX1835EUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1835EUT-T.pdf
- Description:
- IC REG BOOST 3.3V 150MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:37,218
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Product details
Overview
MAX1835EUT-T from Maxim Integrated is a high-efficiency, fixed 3.3V step-up DC-DC converter with reverse battery protection, synchronous rectification, and RST power-on reset output. It operates from +1.5V to +5.5V input, delivers up to 150mA load current, and achieves >90% efficiency at 40mA. It is used in battery-powered portable devices requiring stable 3.3V rail generation and backup power management.
For engineers reviewing the MAX1835EUT-T datasheet, MAX1835EUT-T pinout, MAX1835EUT-T application, or MAX1835EUT-T equivalent, key selection criteria include its fixed 3.3V output, shutdown behavior (VBATT − 0.7V output), RST open-drain reset threshold (2.80–3.14V), and SOT23-6 package compatibility with space-constrained handheld instruments and remote transmitters.
Technical Context
The MAX1835EUT-T uses a current-limited, oscillator-free control scheme with 5µs maximum switch on-time and zero-crossing detection for synchronous rectification. Its internal N-channel MOSFET (0.5Ω typ RDS(ON)) and P-channel rectifier eliminate external diodes while enabling >90% efficiency across 0.1–150mA loads.
Reverse battery protection is implemented via an integrated N-channel MOSFET that disconnects BATT from LX and OUT when input polarity is inverted, limiting reverse current to <10µA. In shutdown, it isolates the output from the battery - unlike MAX1833 - delivering VBATT − 0.7V at OUT without internal PFET conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.3% (3.208V–3.372V) over −40°C to +85°C - ensures stable logic supply for microcontrollers and sensors. |
| Input Voltage Range | +1.5V to +5.5V - supports single Li+ cell, two alkaline/NiMH cells, or regulated intermediate rails. |
| Max Output Current | 150mA at VBATT = +2V, VOUT = +3.3V - sufficient for powering RF transceivers, LCD bias, or low-power peripherals. |
| Efficiency | 90% typical at VBATT = +2V, VOUT = +3.3V, ILOAD = 40mA - minimizes thermal rise and extends battery life in portable systems. |
| Quiescent Current | 4µA typical - enables ultra-low standby power in always-on monitoring applications. |
| RST Threshold | Falling-edge threshold 2.80–3.14V (10% below regulation) - provides reliable power-on reset for microcontrollers without external supervision ICs. |
| Shutdown Current | <1µA into BATT, <1µA into OUT - critical for long-term battery storage in medical or metering devices. |
Pinout & Package
MAX1835EUT-T is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA, footprint 21-0058I), with 0.95mm pitch, 2.9mm × 1.6mm body, and exposed pad not present. Pin 1 marked by dot; top-mark AAOW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-high enable input | Drives device ON/OFF; 1.17–1.286V rising-edge threshold enables low-battery cutoff; reverse-battery protected. |
| 2 - BATT | Battery input connection | Accepts +1.5V to +5.5V; reverse-polarity protected - blocks current if connected backward. |
| 3 - GND | Power ground reference | Common return for all internal circuits; must be tied directly to PCB ground plane for noise immunity. |
| 4 - LX | Switch node | Connects to inductor; carries pulsed current; reverse-battery protected; requires short, low-inductance trace. |
| 5 - OUT | Regulated 3.3V output | Delivers up to 150mA; bootstrapped supply for internal circuitry; sense point for regulation loop. |
| 6 - RST | Open-drain power-on reset | Pulls low when VOUT drops >10% below 3.3V; high-impedance in shutdown; requires external pullup to OUT. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse battery protection | Integrated N-MOSFET blocks reverse current <10µA - eliminates need for external series diode or protection IC. |
| Synchronous rectification | Internal P-channel MOSFET replaces Schottky diode - reduces forward drop, improves efficiency, and saves board area. |
| RST power-on reset output | Guaranteed 10% undervoltage detection with open-drain output - enables clean MCU initialization without external supervisor. |
| Shutdown output behavior | Delivers VBATT − 0.7V at OUT (no internal PFET conduction) - prevents backfeed while allowing separate backup battery integration. |
| Ultra-low quiescent current | 4µA typical operating current - extends shelf life and runtime in intermittent-use battery devices like remote sensors. |
Applications
| Medical Diagnostic Equipment | Pagers |
|---|---|
|
Use Scenario: Portable glucose meters and handheld ultrasound probes powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V for ADC, display driver, and Bluetooth LE radio. Use Value: Reverse battery protection prevents damage during field battery swaps; RST ensures deterministic MCU boot after power-on. |
Use Scenario: Two-way pagers with flash memory retention and vibration alert circuitry. IC Role / Device Role / Timing Role: Primary 3.3V supply for SRAM backup and real-time clock during main power loss. Use Value: Shutdown output voltage (VBATT − 0.7V) allows direct connection to low-threshold backup circuits without extra diodes. |
| Remote Wireless Transmitters | Digital Cameras |
|
Use Scenario: Battery-operated LoRaWAN soil moisture sensor nodes deployed in agricultural fields. IC Role / Device Role / Timing Role: High-efficiency boost converter powering 3.3V RF transceiver during brief transmission bursts. Use Value: 90% efficiency at 40mA and 4µA quiescent current maximize battery lifetime over multi-year deployments. |
Use Scenario: Compact digital cameras using single Li+ cell with OLED viewfinder and image sensor interface. IC Role / Device Role / Timing Role: Generates 3.3V for CMOS image sensor bias and SD card interface logic. Use Value: Fixed 3.3V output eliminates feedback resistor network - reduces BOM count and layout sensitivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1833EUT-T | Same SOT23-6 package and 3.3V output, but connects BATT to OUT in shutdown (VBATT, not VBATT − 0.7V). | Preferred where backup power must mirror battery voltage exactly (e.g., RTC with no diode drop). | Select MAX1833EUT-T if backup path continuity is required; MAX1835EUT-T if isolation from battery during shutdown is critical. |
| TPS61022DRVR | 3.3V fixed output, 1.8–5.5V input, 1.2A switch current, but no RST output or reverse battery protection. | Used in higher-current applications (e.g., LED backlight) where protection features are handled externally. | Choose TPS61022DRVR only when higher output current (>150mA) is needed and reverse protection is implemented at system level. |
Compared with MAX1833EUT-T, MAX1835EUT-T trades shutdown-mode battery connectivity for improved isolation and reduced leakage risk; versus TPS61022DRVR, it offers integrated safety features at lower current capability - making it optimal for compact, battery-sensitive instrumentation.
Availability
MAX1835EUT-T is available at Aetrix Electronics and suitable for medical diagnostic equipment, remote wireless transmitters, and digital cameras requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX1835EUT-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, medical, and communications applications.
The MAX1832–MAX1835 family was engineered specifically for ultra-low-power, reverse-polarity-protected boost conversion in space-constrained battery-powered instruments - prioritizing efficiency, protection integrity, and minimal external component count.
FAQ
What is the output voltage tolerance of the MAX1835EUT-T over temperature?
The MAX1835EUT-T delivers a fixed 3.3V output with guaranteed tolerance of ±3.3% (3.208V to 3.372V) across the full −40°C to +85°C operating range. This specification is validated per the Electrical Characteristics table in the official datasheet (Rev 2, 2005), ensuring reliable logic-level compatibility for microcontrollers and sensors without external trimming.
Does the MAX1835EUT-T provide reverse battery protection, and how does it behave under reversed polarity?
Yes, the MAX1835EUT-T integrates proprietary reverse battery protection. When BATT is connected with negative polarity, its internal N-channel MOSFET turns OFF, limiting reverse current into OUT and BATT to <10µA. This protects both the IC and downstream circuitry without requiring external components - a key differentiator versus standard boost converters.
How does the RST pin on the MAX1835EUT-T function, and what external components are required?
The RST pin on the MAX1835EUT-T is an open-drain power-on reset output that pulls low when VOUT falls >10% below 3.3V (i.e., below ~2.97V). It requires an external pullup resistor (100kΩ to 1MΩ) to OUT. During shutdown, RST is high-impedance. This eliminates the need for a discrete supervisor IC in microcontroller-based systems using MAX1835EUT-T.
What is the shutdown behavior of the MAX1835EUT-T, and how does it differ from the MAX1833EUT-T?
In shutdown (SHDN = LOW), the MAX1835EUT-T outputs VBATT − 0.7V at the OUT pin due to absence of internal PFET conduction - enabling safe integration with separate backup batteries. In contrast, the MAX1833EUT-T connects BATT directly to OUT via an internal PFET, delivering VBATT. This structural difference defines their respective use cases in backup power architecture.
What inductor value is recommended for the MAX1835EUT-T, and why is 10µH commonly used?
A 10µH inductor is recommended for the MAX1835EUT-T as it balances size, ripple, and peak current handling. The datasheet confirms 10µH performs well across load conditions; values from 4.7µH to 100µH are acceptable. Smaller inductors reduce physical size but increase ripple; larger ones minimize ripple but limit max output current due to on-time constraints - 10µH represents the optimal trade-off for most portable applications using MAX1835EUT-T.
MAX1835EUT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 150mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX1835EUT-T FAQ
1.How can I place an order for MAX1835EUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1835EUT-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 MAX1835EUT-T reliable?
The price and inventory of MAX1835EUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1835EUT-T is usually 5 days.
3.What payment methods are accepted for MAX1835EUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1835EUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1835EUT-T?
MAX1835EUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1835EUT-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 MAX1835EUT-T?
For technical support, including MAX1835EUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1835EUT-T requirements.
6.How does Aetrix verify that MAX1835EUT-T is sourced from the original manufacturer or authorized distributors?
All MAX1835EUT-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 MAX1835EUT-T meets industry standards.
7.What is the process for return or replacement of MAX1835EUT-T?
All MAX1835EUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1835EUT-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 MAX1835EUT-T part is unused and in its original packaging.
Return procedure for MAX1835EUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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