My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX4837EUT28BD3
- Part No.:
- MAX4837EUT28BD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4837EUT28BD3.pdf
- Description:
- 500MA, LDO LINEAR REGULATOR WITH
- Quantity:
- Payment:
- Shipping:
Inventory:1,929
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX4837EUT28BD3 from Maxim Integrated is a 500mA low-dropout linear regulator with integrated current-limiting switch and active-low push-pull RESET output, preset to 2.8V output, operating from 2.5V to 5.5V input, featuring 330mV dropout at full load, 90µA quiescent current, and reverse-current protection. It delivers stable power to USB ports, SDIO interfaces, and portable GPS systems requiring precise reset supervision during brownout or thermal events.
For engineers reviewing the MAX4837EUT28BD3 datasheet, MAX4837EUT28BD3 pinout, MAX4837EUT28BD3 application, or MAX4837EUT28BD3 equivalent, this page provides verified technical context, exact pin functions, real-world use cases in portable electronics, and validated alternative options for voltage-regulated power delivery with reset signaling.
Technical Context
The MAX4837EUT28BD3 implements a BiCMOS-based LDO architecture with internal 1.23V reference, error amplifier, and pass transistor controlled via soft-start ramp on the SS pin. Its RESET function asserts low when VOUT drops below 87.5% of nominal (2.45V), with fixed 225ms timeout (D3 suffix) and push-pull drive capable of sinking 3.2mA.
It integrates shutdown discharge (900Ω internal resistor from OUT to GND), reverse-current protection (IN off when VOUT ≥ VIN), and thermal shutdown at +165°C with 15°C hysteresis. Soft-start time is programmable via external capacitor on SS (e.g., 0.1µF yields ~100ms), and blanking logic is absent-unlike the FLAG-equipped MAX4836-since it uses RESET instead of latch-off behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% over -40°C to +85°C; enables direct powering of 2.8V I/O rails without external feedback. |
| Load Current | Guaranteed 500mA continuous; supports high-current peripherals like USB transceivers and SD card controllers. |
| Dropout Voltage | 330mV at 500mA; allows operation with only 3.13V input for 2.8V output, critical in battery-powered systems near end-of-discharge. |
| Quiescent Current | 90µA typical at full load; minimizes standby power loss in always-on subsystems such as GPS receivers. |
| RESET Timeout | 225ms (D3 suffix); ensures system microcontroller remains held in reset long enough to fully clear state after supply recovery. |
| Input Voltage Range | 2.5V to 5.5V; compatible with single-cell Li-ion (2.7–4.2V), 3.3V rails, and 5V USB sources. |
| Shutdown Current | 0.1µA max; enables ultra-low-power sleep modes in handheld devices without external discharge circuitry. |
Pinout & Package
MAX4837EUT28BD3 is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA) with exposed pad internally connected to GND; footprint requires soldering the EP to PCB ground plane for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power input | Bypassed with 0.1µF ceramic capacitor; must be ≥2.5V and ≤5.5V; reverse-current protection disables conduction if VOUT > VIN. |
| 2 GND | Ground reference | Common return for all internal circuits; EP (exposed pad) is electrically tied to this pin and must be soldered to PCB ground. |
| 3 SHDN | Active-low enable | Pulled low to enter 0.1µA shutdown; pulled high or tied to IN for normal operation; hysteresis of 30mV prevents chatter. |
| 4 RESET | Active-low reset output | Push-pull driver sinks 3.2mA at 0.4V max; asserts low when VOUT < 2.45V, VIN < 2.25V, SHDN low, or thermal shutdown active. |
| 5 SS | Soft-start control | Capacitor from SS to GND sets output ramp time (e.g., 0.1µF → ~100ms); floating = 1ms minimum ramp; eliminates false resets during startup. |
| 6 OUT | Regulated output | Delivers 2.8V ±2%; requires ≥3.3µF ceramic capacitor with ESR < 0.2Ω; discharges via 900Ω internal resistor during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Shutdown Output Discharge | Integrated 900Ω resistor from OUT to GND ensures rapid discharge of output capacitance during shutdown, preventing back-powering of upstream circuits. |
| Preset 2.8V Output | Factory-trimmed 2.8V ±2% eliminates need for external resistive divider, reducing BOM count and layout area in space-constrained portable designs. |
| 225ms RESET Timeout (D3) | Guaranteed minimum assertion duration prevents premature release of system reset during marginal supply recovery, improving boot reliability. |
| Reverse-Current Protection | Blocks current flow from OUT to IN when VOUT ≥ VIN, protecting battery sources and enabling safe hot-swap operation in multi-rail systems. |
| Low 90µA Quiescent Current | Enables >1-year battery life in always-on GPS modules drawing 10µA average system current, assuming 200mAh coin cell. |
Applications
| USB Port Power Management | SDIO Interface Regulation |
|---|---|
|
Use Scenario: Powering USB 2.0 transceivers and PHYs in notebook computers and docking stations where input rail varies between 3.3V and 5V. IC Role / Device Role / Timing Role: LDO regulator with RESET supervision ensures clean power-up sequencing and brownout detection before USB enumeration begins. Use Value: 2.8V output matches standard USB PHY I/O voltage; 225ms RESET timeout prevents spurious disconnects during transient dips on shared 3.3V bus. |
Use Scenario: Supplying regulated 2.8V to SDIO host controllers and memory cards in PDAs and palmtop devices with Li-ion batteries. IC Role / Device Role / Timing Role: Current-limited LDO with reverse-current protection isolates SDIO bus from battery during sleep, while RESET signals host MCU on undervoltage. Use Value: 500mA capability supports burst-mode SD writing; shutdown discharge clears residual voltage to meet SDIO AC timing requirements. |
| Portable GPS Receiver Power | Cell Phone Baseband Core Supply |
|
Use Scenario: Delivering stable 2.8V to GPS RF front-end and baseband ICs in handheld navigation units powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Low-noise LDO with 70µVRMS output noise and RESET output ensures GNSS signal integrity and cold-start reliability. Use Value: 90µA IQ extends battery runtime during continuous tracking; 330mV dropout allows operation down to 3.13V input, covering >95% of battery discharge curve. |
Use Scenario: Regulating 2.8V core supply for baseband processors in legacy 2G/3G cell phones with tight thermal constraints. IC Role / Device Role / Timing Role: Thermal-shutdown protected LDO with push-pull RESET coordinates safe processor reset during junction overheating events. Use Value: +165°C shutdown threshold with 15°C hysteresis prevents thermal runaway; SOT23-6 footprint fits dense mobile PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-RESET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4837ETT28BD3 | Same electrical specs and RESET functionality, but in 3mm × 3mm TDFN-6 package with exposed pad for superior thermal performance (1951mW dissipation vs. 727mW). | Preferred for thermally constrained designs (e.g., sealed GPS modules) where ambient temperature exceeds +70°C or power dissipation >300mW. | Select when board layout allows larger footprint and thermal relief is prioritized over minimal area. |
| MAX4835ETT28BD2 | 250mA version with identical 2.8V output, D2 (30ms) RESET timeout, same pinout, and TDFN-6 package; lower current rating and shorter reset hold time. | Suitable for lower-power SDIO peripherals or auxiliary rails where peak load ≤250mA and faster reset release is acceptable. | Choose when system load is confirmed ≤250mA and 30ms reset duration satisfies boot timing margins. |
Compared with MAX4837EUT28BD3, the TDFN variant offers 2.7× higher thermal dissipation for sustained 500mA loads, while the MAX4835ETT28BD2 trades current capacity and reset timing for cost and thermal simplicity in lighter-duty applications.
Availability
MAX4837EUT28BD3 is available at Aetrix Electronics and suitable for USB port regulation, SDIO interface power, and portable GPS receiver designs requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.
Supply support for MAX4837EUT28BD3 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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX4836/MAX4837 product line was designed specifically for portable electronics requiring tightly regulated, current-limited power with integrated system supervision-emphasizing low IQ, small footprint, and robust fault handling in battery-powered environments.
FAQ
What is the exact output voltage and tolerance of the MAX4837EUT28BD3?
The MAX4837EUT28BD3 provides a factory-trimmed fixed output voltage of 2.8V with ±2% accuracy across -40°C to +85°C operating temperature and 1mA to 500mA load current. This specification is guaranteed in the Electrical Characteristics table under "Output Voltage Accuracy" and applies regardless of input voltage within the 2.5V–5.5V range.
Does the MAX4837EUT28BD3 include output discharge during shutdown?
Yes, the MAX4837EUT28BD3 includes internal shutdown output discharge via a 900Ω resistor from OUT to GND. When SHDN is pulled low, this path actively discharges external output capacitance, ensuring rapid voltage decay and preventing back-powering of upstream circuitry-a key requirement in SDIO and USB applications.
What does the 'D3' suffix in MAX4837EUT28BD3 indicate?
'D3' denotes the RESET timeout period: 225ms (minimum). Per Table 2 in the datasheet, D3 corresponds to a guaranteed reset assertion duration of 225ms after fault clearance, ensuring sufficient hold time for microcontrollers to perform full register initialization before release. This is distinct from D1 (3.75ms), D2 (30ms), and D4 (1800ms).
How is reverse-current protection implemented in the MAX4837EUT28BD3?
The MAX4837EUT28BD3 prevents reverse current flow from OUT to IN by disabling the internal pass transistor whenever VOUT ≥ VIN. Under this condition, input current is limited to ≤3µA (per datasheet Electrical Characteristics), protecting battery sources and enabling safe hot-plug operation in multi-supply systems without external blocking diodes.
Can the MAX4837EUT28BD3 be used with a 0.1µF soft-start capacitor?
Yes-the MAX4837EUT28BD3 supports soft-start capacitor values from floating (1ms default) up to 0.1µF, which yields ~100ms output rise time per the tSS = CSS (ms) equation (CSS in nF). A 0.1µF capacitor (100nF) is explicitly validated in Typical Operating Characteristic toc10 and ensures glitch-free startup in noise-sensitive GPS and RF applications.
MAX4837EUT28BD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.33V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset, Soft Start
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN (3x3)
MAX4837EUT28BD3 FAQ
1.How can I place an order for MAX4837EUT28BD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4837EUT28BD3 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 MAX4837EUT28BD3 reliable?
The price and inventory of MAX4837EUT28BD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4837EUT28BD3 is usually 5 days.
3.What payment methods are accepted for MAX4837EUT28BD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4837EUT28BD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4837EUT28BD3?
MAX4837EUT28BD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4837EUT28BD3 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 MAX4837EUT28BD3?
For technical support, including MAX4837EUT28BD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4837EUT28BD3 requirements.
6.How does Aetrix verify that MAX4837EUT28BD3 is sourced from the original manufacturer or authorized distributors?
All MAX4837EUT28BD3 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 MAX4837EUT28BD3 meets industry standards.
7.What is the process for return or replacement of MAX4837EUT28BD3?
All MAX4837EUT28BD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4837EUT28BD3, 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 MAX4837EUT28BD3 part is unused and in its original packaging.
Return procedure for MAX4837EUT28BD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX4837EUT28BD3 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
