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Analog Devices Inc./Maxim Integrated MAX1835EUT
- Part No.:
- MAX1835EUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1835EUT.pdf
- Description:
- IC REG BOOST 3.3V 150MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:680
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Product details
Overview
MAX1835EUT from Maxim Integrated is a high-efficiency, fixed 3.3V step-up DC-DC converter with reverse battery protection, synchronous rectification, and integrated power-on reset (RST) output. It operates from +1.5V to +5.5V input, delivers up to 150mA load current, and achieves >90% efficiency at 40mA - ideal for battery-powered portable instrumentation requiring robust polarity fault tolerance.
For engineers reviewing the MAX1835EUT datasheet, MAX1835EUT pinout, MAX1835EUT application, or MAX1835EUT equivalent, key selection criteria include its SOT23-6 package footprint, RST open-drain reset threshold (2.80–3.14V), shutdown behavior (VBATT − 0.7V output in OFF state), and absence of external diode requirement due to internal synchronous rectifier.
Technical Context
The MAX1835EUT uses a current-limited, oscillator-free control scheme with 5µs maximum on-time and zero-crossing detection to regulate output voltage. Its internal N-channel switch (0.5Ω typical RDS(ON)) and P-channel synchronous rectifier eliminate external Schottky diode losses while enabling ultra-low quiescent current (4µA).
Reverse battery protection is implemented via a dedicated N-channel MOSFET that disconnects BATT from LX and OUT when input polarity is inverted, limiting reverse leakage to <10µA. The RST output asserts low when VOUT falls 10% below regulation, providing deterministic power-on reset signaling without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.3% over −40°C to +85°C - enables direct replacement of 3.3V LDOs without feedback resistor network. |
| Input Voltage Range | +1.5V to +5.5V - supports single Li+ cell, two alkaline/NiMH cells, or USB-supplied systems. |
| Max Output Current | 150mA at VBATT = +2V - sufficient for powering microcontrollers, sensors, and RF transceivers in portable devices. |
| Efficiency | 90% at VBATT = +2V, VOUT = +3.3V, ILOAD = 40mA - reduces thermal load and extends battery runtime vs. diode-based boosters. |
| Quiescent Current | 4µA - minimizes no-load battery drain in always-on monitoring applications. |
| RST Threshold | 2.80V to 3.14V (−40°C to +85°C) - provides reliable reset assertion before brownout affects digital logic. |
| Shutdown Supply Current | <1µA - ensures negligible standby power consumption during system sleep modes. |
| Package | SOT23-6 (U6F-6) - 2.9mm × 1.6mm footprint compatible with high-density PCB layouts. |
Pinout & Package
MAX1835EUT is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA, Maxim pkg code U6F-6), with exposed pad not electrically connected. Pin 1 is marked by a dot; device orientation follows standard SOT23 top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-high enable input | Drives internal PFET gate; 1.17–1.286V rising-edge threshold enables low-battery cutoff using external resistor divider. |
| 2 BATT | Battery input with reverse polarity protection | Connects to primary power source; reverse-battery leakage limited to <10µA when VBATT negative. |
| 3 GND | Analog/digital ground reference | Must be tied directly to low-impedance ground plane; critical for minimizing switching noise and RST accuracy. |
| 4 LX | Switch node connection | Drain of internal N-channel switch and P-channel synchronous rectifier; connects to external inductor. |
| 5 OUT | Regulated 3.3V output and bootstrap supply | Provides power to internal circuitry; serves as RST pullup source and SHDN reference when unused. |
| 6 RST | Open-drain power-on reset output | Pulls low when VOUT drops 10% below 3.3V; requires external pullup to OUT for proper logic-level reset signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectifier | Eliminates external Schottky diode, reducing BOM count, board area, and forward-voltage loss - directly enabling >90% efficiency at light loads. |
| Reverse battery protection | Proprietary N-channel MOSFET gate control blocks reverse current path, protecting IC, battery, and downstream circuitry without added components or efficiency penalty. |
| Power-on reset (RST) output | Open-drain output with guaranteed 10% undervoltage detection window ensures reliable MCU/system reset timing without external supervisor IC. |
| Ultra-low quiescent current | 4µA operating current extends battery life in intermittently active devices such as remote sensors and medical monitors. |
| Shutdown output behavior | VOUT = VBATT − 0.7V in shutdown - isolates backup power path from main regulator, preventing cross-conduction in dual-battery systems. |
Applications
| Medical Diagnostic Equipment | Pagers |
|---|---|
Use Scenario: Portable blood 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 rail for ADC, microcontroller, and display driver from declining battery voltage. Use Value: Reverse battery protection prevents damage during field-replaceable battery swaps; RST ensures clean boot after battery insertion. |
Use Scenario: Two-way alphanumeric pagers with flash memory and RF transceiver requiring regulated 3.3V supply. IC Role / Device Role / Timing Role: Primary DC-DC converter supplying 3.3V to baseband processor and memory subsystem. Use Value: 4µA quiescent current extends standby time between paging events; SOT23-6 footprint enables compact stacked PCB design. |
| Hand-Held Instruments | Remote Wireless Transmitters |
Use Scenario: Battery-operated multimeters and thermal imagers with LCD backlight and precision analog front-end. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering low-noise 3.3V for mixed-signal SoC and sensor interface. Use Value: >90% efficiency at 40mA reduces self-heating near temperature-sensitive components; synchronous rectification eliminates diode EMI. |
Use Scenario: Solar-powered environmental sensor nodes transmitting data via LoRaWAN or NB-IoT modules. IC Role / Device Role / Timing Role: Voltage booster enabling 3.3V operation from single-cell LiFePO₄ or supercapacitor storage. Use Value: Shutdown current <1µA preserves energy during multi-hour sleep cycles; RST output synchronizes wake-up sequence with power stabilization. |
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 | Identical pinout, same 3.3V output, but connects BATT to OUT in shutdown (VBATT path), not VBATT − 0.7V. | Suitable where backup power via inductor-coupled battery path is required (e.g., RTC hold-up), unlike MAX1835EUT's isolated shutdown mode. | Select MAX1833EUT-T only if system requires battery-to-output conduction during shutdown; otherwise MAX1835EUT offers superior isolation. |
| TPS61022DRVR | 3.3V fixed output, 1.8V–5.5V input, 1.2A switch current, but no RST output or reverse battery protection. | Lacks polarity fault tolerance and integrated reset - requires external supervisor and reverse-blocking FET for equivalent functionality. | Choose TPS61022DRVR only when higher output current (>150mA) is needed and reverse protection/RST are handled externally. |
Compared with MAX1833EUT-T and TPS61022DRVR, the MAX1835EUT uniquely combines fixed 3.3V output, RST functionality, and reverse battery protection in a 6-pin SOT23 - eliminating four external components (diode, supervisor, blocking FET, feedback resistors) versus alternatives.
Availability
MAX1835EUT is available at Aetrix Electronics and suitable for medical diagnostic equipment, remote wireless transmitters, and hand-held instruments requiring stable component supply across extended production lifecycles.
Supply support for MAX1835EUT 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, space-constrained battery-powered systems needing reverse-polarity resilience and integrated reset - targeting portable instrumentation and wireless edge nodes.
FAQ
What is the output voltage tolerance of the MAX1835EUT over temperature?
The MAX1835EUT delivers a fixed 3.3V output with ±3.3% tolerance across the full −40°C to +85°C operating range, as specified in the Electrical Characteristics table (3.208V to 3.372V). This tight regulation eliminates need for post-regulation filtering in most 3.3V logic and analog applications, and the MAX1835EUT maintains this accuracy without external feedback components.
Does the MAX1835EUT require an external Schottky diode?
No, the MAX1835EUT does not require an external Schottky diode because it integrates a synchronous rectifier with a P-channel MOSFET that replaces the diode function. This internal architecture reduces conduction losses, improves efficiency to >90% at 40mA, and eliminates the board space, cost, and thermal overhead associated with discrete diodes - a key differentiator of the MAX1835EUT versus legacy boost controllers.
How does the RST output of the MAX1835EUT behave during startup and shutdown?
The RST output of the MAX1835EUT is an open-drain signal that pulls low when VOUT falls 10% below 3.3V (i.e., ≤2.97V) and releases high impedance when regulation is achieved. In shutdown (SHDN = low), RST enters high-impedance state - no current flows. A pullup resistor to OUT is required for valid logic levels, and the MAX1835EUT's RST timing ensures deterministic microcontroller reset without external supervision.
What is the shutdown behavior of the MAX1835EUT regarding output voltage?
In shutdown (SHDN = low), the MAX1835EUT disables switching and sets VOUT to VBATT − 0.7V, unlike the MAX1833EUT-T which connects BATT directly to OUT. This behavior isolates the output from the battery path, preventing unintended power transfer - critical in systems with separate backup batteries or energy-harvesting inputs where cross-conduction must be avoided. The MAX1835EUT implements this via controlled PFET gate biasing.
Can the MAX1835EUT operate from a single lithium-ion cell?
Yes, the MAX1835EUT operates from a +1.5V to +5.5V input range, fully covering the discharge profile of a single Li+ cell (4.2V down to ~2.7V). Its 1.5V startup voltage allows reliable turn-on even at end-of-life battery voltage, and the 4µA quiescent current minimizes parasitic drain during idle periods - making the MAX1835EUT well-suited for Li+-powered portable devices like handheld scanners and wearable health monitors.
MAX1835EUT 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 FAQ
1.How can I place an order for MAX1835EUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1835EUT 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 reliable?
The price and inventory of MAX1835EUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1835EUT is usually 5 days.
3.What payment methods are accepted for MAX1835EUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1835EUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1835EUT?
MAX1835EUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1835EUT 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?
For technical support, including MAX1835EUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1835EUT requirements.
6.How does Aetrix verify that MAX1835EUT is sourced from the original manufacturer or authorized distributors?
All MAX1835EUT 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 meets industry standards.
7.What is the process for return or replacement of MAX1835EUT?
All MAX1835EUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX1835EUT, 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 part is unused and in its original packaging.
Return procedure for MAX1835EUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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