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Analog Devices Inc./Maxim Integrated MAX1833EUT
- Part No.:
- MAX1833EUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1833EUT.pdf
- Description:
- IC REG BOOST 3.3V 150MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:568
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Product details
Overview
MAX1833EUT from Maxim Integrated is a high-efficiency, fixed 3.3V step-up DC-DC converter with reverse battery protection, synchronous rectification, and 4µA quiescent current. It operates from +1.5V to +5.5V input, delivers up to 150mA output, and integrates an internal N-channel/P-channel MOSFET switch pair for compact battery-powered systems such as medical diagnostics and remote transmitters.
For engineers reviewing the MAX1833EUT datasheet, MAX1833EUT pinout, MAX1833EUT application, or MAX1833EUT equivalent, key selection criteria include its SOT23-6 package, 3.3V fixed output, RST open-drain power-on reset output, shutdown-to-battery-backup functionality, and reverse polarity protection without external components.
Technical Context
The MAX1833EUT uses a current-limited, oscillator-free control scheme with programmable on-time (max 5µs) and zero-crossing detection to regulate output voltage. Its internal synchronous rectifier replaces the external Schottky diode, reducing conduction loss and enabling >90% efficiency at 40mA load with 2V input.
Reverse battery protection is implemented via a dedicated N-channel MOSFET that disconnects BATT from LX when polarity is reversed, protecting both IC and load. In shutdown, the internal P-channel FET connects BATT to OUT through the inductor-enabling backup power for RTC or SRAM without diode drop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.2% over -40°C to +85°C - ensures stable supply for 3.3V logic without external feedback resistors. |
| Input Voltage Range | +1.5V to +5.5V - supports two alkaline/NiMH cells or single Li+ cell without external regulation. |
| Max Output Current | 150mA at VBATT = +2V - sufficient for low-power microcontrollers, sensors, and RF transceivers. |
| Quiescent Current | 4µA typical - minimizes battery drain in standby, extending runtime in always-on portable devices. |
| Shutdown Current | <1µA into BATT - enables ultra-low leakage during system sleep modes. |
| Efficiency | 90% at VBATT = +2V, VOUT = +3.3V, ILOAD = 40mA - reduces thermal load and extends battery life. |
| RST Threshold | 2.98V falling edge (±3.2%) - provides precise 10% undervoltage detection for reliable power-on reset signaling. |
Pinout & Package
MAX1833EUT is housed in a miniature 6-pin SOT23-6 package (JEDEC MO-178AA, footprint 2.9mm × 2.8mm × 1.3mm), optimized for space-constrained portable designs. Thermal performance supports 727mW continuous dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-high enable input | Drives device ON/OFF; includes 1.228V low-battery cutoff threshold and reverse battery protection. |
| 2 - BATT | Battery input connection | Protected input node; reverse polarity blocks current flow to prevent damage to IC and load. |
| 3 - GND | Power ground reference | Common return path for all internal circuits; must be connected directly to PCB ground plane. |
| 4 - LX | Switch node | Connects to inductor; carries pulsed current from N-channel switch and synchronous P-channel rectifier. |
| 5 - OUT | Regulated output | 3.3V power rail; also serves as bootstrapped supply for internal circuitry and RST pullup reference. |
| 6 - RST | Open-drain power-on reset | Pulls low when VOUT falls 10% below regulation; high-impedance in shutdown to avoid loading. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse battery protection | Proprietary N-MOSFET gate control isolates BATT from LX during reverse polarity-no external protection required. |
| Synchronous rectification | Integrated P-channel MOSFET eliminates Schottky diode, reducing forward drop and improving efficiency by ~5–8%. |
| Battery-to-OUT backup path | Internal P-FET connects BATT to OUT in shutdown-enables seamless RTC/SRAM backup without external diodes. |
| Power-on reset (RST) | Open-drain output asserts low at 2.98V (10% under 3.3V), providing deterministic system initialization timing. |
| Ultra-low quiescent current | 4µA operation enables >1-year battery life in low-duty-cycle applications like wireless sensors. |
Applications
| Medical Diagnostic Equipment | Pagers |
|---|---|
|
Use Scenario: Portable glucose meters and handheld ultrasound probes requiring long battery life and robust reverse-polarity immunity. IC Role / Device Role / Timing Role: Primary 3.3V supply generator with integrated reverse battery protection and shutdown-controlled backup for memory retention. Use Value: Eliminates need for external protection diodes and backup batteries-reducing BOM count and PCB area by ≥3 components. |
Use Scenario: Two-cell alkaline-powered pagers needing regulated 3.3V for RF front-end and microcontroller. IC Role / Device Role / Timing Role: Step-up regulator with RST output ensuring clean processor reset during battery insertion or voltage sag. Use Value: 90% efficiency at 40mA extends alkaline cell life beyond 6 months in intermittent-use mode. |
| Hand-Held Instruments | Remote Wireless Transmitters |
|
Use Scenario: Battery-operated multimeters and environmental sensors deployed in field service environments. IC Role / Device Role / Timing Role: Main power supply with SHDN-controlled deep-sleep mode and reverse polarity fault tolerance. Use Value: 1µA shutdown current preserves battery charge during multi-week storage; ruggedized against accidental reverse installation. |
Use Scenario: Zigbee/Bluetooth LE sensor nodes powered by AA/AAA cells transmitting data every 5 minutes. IC Role / Device Role / Timing Role: High-efficiency boost converter supplying 3.3V to transceiver and MCU, synchronized with transmit duty cycle. Use Value: 4µA quiescent current ensures >2-year battery life at 0.1% duty cycle-validated per typical operating curves. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1835EUT-T | Same SOT23-6 package and 3.3V fixed output, but outputs VBATT − 0.7V in shutdown (not direct battery backup). | Lacks BATT-to-OUT backup path; suitable where backup power is not required and lower shutdown leakage is critical. | Select MAX1835EUT-T only if RST functionality is needed but battery backup is unnecessary. |
| TPS61022DSQR | 3.3V fixed output, 2.5V–5.5V input, 1.2A switch current, but no reverse battery protection or RST output. | Higher output current capability, but requires external reverse-polarity protection and separate reset IC. | Choose TPS61022DSQR when >150mA load or higher input voltage range is required, accepting added BOM complexity. |
Compared with MAX1835EUT-T and TPS61022DSQR, the MAX1833EUT uniquely combines reverse battery protection, RST output, and true battery-backed shutdown in a 6-pin SOT23-making it optimal for safety-critical, space-constrained, single-battery portable systems.
Availability
MAX1833EUT is available at Aetrix Electronics and suitable for medical diagnostics, remote transmitters, hand-held instruments, and battery backup systems requiring stable component supply, RoHS-compliant sourcing, and long-term lifecycle support.
Supply support for MAX1833EUT 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 industrial, medical, and portable applications.
The MAX1832–MAX1835 family was designed specifically for ultra-low-power, reverse-polarity-robust step-up conversion in space-constrained battery-powered equipment-prioritizing efficiency, integration, and fault resilience over raw output current.
FAQ
What is the output voltage tolerance of the MAX1833EUT over temperature?
The MAX1833EUT delivers a fixed 3.3V output with ±2.2% tolerance across the full -40°C to +85°C operating range, as specified in the Electrical Characteristics table (3.208V min to 3.372V max). This tight regulation eliminates the need for post-regulation LDOs in most 3.3V logic applications, and the tolerance is guaranteed by design-not just tested at +25°C.
Does the MAX1833EUT provide reverse battery protection on all pins?
Yes-the MAX1833EUT implements reverse battery protection on BATT, LX, and SHDN pins per Absolute Maximum Ratings and Pin Description sections. When VBATT is reversed (e.g., −3V), reverse current into BATT, LX, and SHDN is limited to ≤10µA, preventing damage to the IC and downstream circuitry. Protection is inherent to the internal MOSFET structure and requires no external components.
How does the MAX1833EUT achieve battery backup in shutdown mode?
In shutdown (SHDN = low), the MAX1833EUT activates an internal P-channel MOSFET to connect BATT directly to OUT through the external inductor-bypassing the body diode voltage drop. This allows the input battery to power external circuitry (e.g., RTC or SRAM) at near-battery voltage, unlike the MAX1835EUT-T which provides only VBATT − 0.7V in shutdown. The MAX1833EUT's backup path is confirmed in the Selector Guide and Detailed Description.
What is the function of the RST pin on the MAX1833EUT?
The RST pin on the MAX1833EUT is an open-drain power-on reset output that pulls low when VOUT falls 10% below its nominal 3.3V regulation point (i.e., below 2.98V). It remains high-impedance during shutdown. A 100kΩ–1MΩ pullup to OUT provides a logic-level reset signal for microcontrollers-ensuring deterministic startup without external reset ICs. This function is exclusive to MAX1833EUT and MAX1835EUT variants.
Can the MAX1833EUT operate from a single 1.5V alkaline cell?
Yes-the MAX1833EUT starts up reliably from +1.5V input (VSU = 1.24V min at −40°C to +85°C) and maintains regulation down to +1.5V across temperature. Its current-limited control architecture and synchronous rectification enable stable 3.3V output even as the alkaline cell discharges from 1.5V to ~0.9V, making it ideal for two-cell or single-cell primary battery systems where minimum input voltage is critical.
MAX1833EUT 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
MAX1833EUT FAQ
1.How can I place an order for MAX1833EUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1833EUT 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 MAX1833EUT reliable?
The price and inventory of MAX1833EUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1833EUT is usually 5 days.
3.What payment methods are accepted for MAX1833EUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1833EUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1833EUT?
MAX1833EUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1833EUT 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 MAX1833EUT?
For technical support, including MAX1833EUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1833EUT requirements.
6.How does Aetrix verify that MAX1833EUT is sourced from the original manufacturer or authorized distributors?
All MAX1833EUT 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 MAX1833EUT meets industry standards.
7.What is the process for return or replacement of MAX1833EUT?
All MAX1833EUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX1833EUT, 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 MAX1833EUT part is unused and in its original packaging.
Return procedure for MAX1833EUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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