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Analog Devices Inc./Maxim Integrated MAX4834ETT18C
- Part No.:
- MAX4834ETT18C
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4834ETT18C.pdf
- Description:
- IC REG LINEAR 250MA LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,439
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Product details
Overview
MAX4834ETT18C from Maxim Integrated is a 250mA, 1.8V fixed-output LDO linear regulator with integrated current-limiting switch and open-drain FLAG output for overcurrent detection. It operates from 2.5V to 5.5V input, features 165mV dropout at full load, 90µA quiescent current, and reverse-current protection. Designed for USB port power management in portable electronics, it delivers stable low-noise voltage with programmable soft-start.
For engineers reviewing the MAX4834ETT18C datasheet, MAX4834ETT18C pinout, MAX4834ETT18C application, or MAX4834ETT18C equivalent, key selection criteria include its 1.8V preset output, FLAG-based fault reporting (not RESET), TDFN-6 package thermal performance, and compatibility with 3.3µF ceramic output capacitors for stability across -40°C to +85°C.
Technical Context
The MAX4834ETT18C implements a BiCMOS-based LDO architecture with an internal P-channel pass transistor, precision 1.23V reference, and error amplifier. Its FLAG function activates after sustained overload exceeding 270mA for >5ms (blanking time), latching off the output until IN or SHDN is cycled.
Soft-start is controlled via external capacitor on SS pin (tSS = CSS in nF), enabling 1ms minimum rise time without external components. Reverse-current protection ensures <0.1µA leakage when VOUT ≥ VIN, and thermal shutdown triggers at +165°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% over -40°C to +85°C; enables direct powering of 1.8V core logic without external feedback. |
| Max Load Current | 250mA guaranteed; supports high-pulse loads in SDIO/USB peripheral rails without dropout or thermal shutdown. |
| Dropout Voltage | 165mV at 250mA; allows operation with VIN as low as 1.965V, critical for battery-powered systems near end-of-life. |
| Quiescent Current | 90µA typical at no load; minimizes standby power loss in always-on subsystems like GPS receivers. |
| Shutdown Current | 0.1µA max; enables ultra-low-power sleep modes in notebook and PDA applications. |
| FLAG Blanking Time | 5–17ms; prevents false triggering during startup inrush or transient overloads, ensuring reliable fault detection. |
| Input Voltage Range | 2.5V to 5.5V; compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and regulated 3.3V supplies. |
Pinout & Package
MAX4834ETT18C uses a 6-pin 3mm × 3mm TDFN package with exposed paddle (EP) internally connected to GND. The EP must be externally soldered to PCB ground for optimal thermal performance (1951.2mW dissipation at +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Power Input | Bypass with 0.1µF ceramic capacitor; accepts 2.5–5.5V input; reverse-current protected. |
| 2 - GND | Ground Reference | Common return for all circuits; connects to EP for thermal path. |
| 3 - SHDN | Active-Low Enable | Pull low to enter 0.1µA shutdown; connect to IN or >1.4V to enable regulator. |
| 4 - FLAG | Open-Drain Fault Indicator | Asserts low when sustained overcurrent (>270mA) exceeds blanking time; requires external pull-up. |
| 5 - SS | Soft-Start Control | Connect capacitor to GND to program output ramp time (tSS = CSS in nF); floating = 1ms default. |
| 6 - OUT | Regulated Output | 1.8V output; bypass with ≥3.3µF ceramic cap (ESR <0.2Ω) for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated FLAG output | Provides system-level overcurrent notification without external comparators or logic, reducing BOM count. |
| Programmable soft-start | Eliminates input supply sag and false resets during power-up by controlling output slew rate via external capacitor. |
| Reverse-current protection | Blocks backfeed from output to input (<0.1µA at VOUT = 5.5V), essential for multi-rail systems with shared batteries. |
| Latch-off under overload | Prevents thermal runaway by disabling output after sustained overcurrent, requiring explicit reset via IN/SHDN toggle. |
| Ultra-low shutdown current | 0.1µA shutdown draw extends battery life in portable devices where long-term storage or deep-sleep modes are used. |
Applications
| USB Port Power Switching | SDIO Card Interface Regulation |
|---|---|
|
Use Scenario: Providing clean, current-limited 1.8V power to USB OTG peripherals during host negotiation and enumeration. IC Role / Device Role / Timing Role: LDO regulator with FLAG-based fault signaling replaces discrete FET + comparator solutions for USB VBUS switching control. Use Value: Prevents bus collapse during short-circuit events on attached peripherals while maintaining compliance with USB power budget constraints. |
Use Scenario: Supplying stable 1.8V to SDIO memory cards and wireless modules in handheld devices. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO with soft-start ensures reliable card initialization without voltage droop-induced timeouts. Use Value: 70µVRMS output noise and 100µs load transient recovery minimize data corruption during high-speed SDIO transfers. |
| Notebook Platform Core Rail | GPS Receiver Baseband Supply |
|
Use Scenario: Delivering 1.8V to low-power microcontrollers and sensor hubs in notebook sub-systems. IC Role / Device Role / Timing Role: High-efficiency LDO with 90µA IQ and latch-off protection serves as always-on domain regulator. Use Value: Enables multi-week standby battery life while guaranteeing safe shutdown during accidental short circuits on downstream logic. |
Use Scenario: Powering GPS baseband ICs requiring precise 1.8V with minimal noise coupling into RF front-end. IC Role / Device Role / Timing Role: Low-PSRR LDO with 3.3µF ceramic output cap provides clean supply isolated from digital switching noise. Use Value: -40dB PSRR at 10kHz and 70µVRMS broadband noise preserve GPS signal acquisition sensitivity and TTFF performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4834EUT18C-T | SOT23-6 package (vs. TDFN-6); 727mW max power dissipation vs. 1951mW; same electrical specs and FLAG functionality. | Lower thermal performance limits continuous 250mA operation in high-ambient environments without heatsinking. | Select for cost-sensitive designs with lower power density requirements and existing SOT23 footprint compatibility. |
| MAX4832EUT18C-T | 100mA rated output (vs. 250mA); identical 1.8V output, FLAG function, and TDFN/SOT23 package options. | Insufficient for USB/SDIO peak loads; suitable only for ultra-low-power logic rails or sensor interfaces. | Choose only when load current remains ≤100mA; avoids overdesign and reduces solution size/cost where full 250mA capability is unnecessary. |
Compared with MAX4834EUT18C-T, MAX4834ETT18C offers 2.7× higher thermal dissipation for sustained 250mA loads in compact layouts; versus MAX4832EUT18C-T, it delivers 2.5× higher current headroom for dynamic USB/SDIO applications without derating.
Availability
MAX4834ETT18C is available at Aetrix Electronics and suitable for USB ports, SDIO interfaces, and GPS receiver power rails requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX4834ETT18C 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, communications, and consumer applications.
The MAX4834/MAX4835 product line was designed specifically for portable electronics requiring accurate current-limited LDOs with intelligent fault signaling-targeting USB, SDIO, and battery-powered subsystems demanding reliability and space efficiency.
FAQ
What is the output voltage tolerance of the MAX4834ETT18C over temperature and load?
The MAX4834ETT18C guarantees ±2% output voltage accuracy across the full -40°C to +85°C operating range and for load currents from 1mA to 250mA. This specification ensures reliable operation of 1.8V logic without external trimming, even under worst-case thermal and loading conditions.
Does the MAX4834ETT18C provide reverse-current protection, and how is it implemented?
Yes, the MAX4834ETT18C includes integrated reverse-current protection that limits current flow from OUT to IN to <0.1µA when VOUT ≥ VIN. This is achieved through internal circuitry that disables the pass transistor when output voltage exceeds input, preventing battery backfeed in multi-supply systems.
How does the FLAG output of the MAX4834ETT18C behave during an overcurrent event?
When load current exceeds 270mA for longer than the blanking time (5–17ms), the MAX4834ETT18C asserts its open-drain FLAG low and latches the output off. Recovery requires toggling IN or SHDN; FLAG remains low until the device re-enables, providing unambiguous fault indication to the host controller.
What capacitor values are required for stable operation of the MAX4834ETT18C?
The MAX4834ETT18C requires a minimum 3.3µF ceramic output capacitor (X7R or better) with ESR <0.2Ω for stability across temperature and load. A 0.1µF ceramic capacitor between IN and GND is also mandatory to suppress input transients and ensure PSRR performance.
Can the MAX4834ETT18C be used in applications requiring shutdown-controlled output discharge?
No-the MAX4834ETT18C does not include output discharge during shutdown. That feature is exclusive to the MAX4835 series (RESET variants). The MAX4834ETT18C retains its output voltage after shutdown unless externally discharged; for active discharge, an external MOSFET or resistor network is required.
MAX4834ETT18C 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset, Soft Start
- Protection Features:
- Over Current, Over Temperature, Reverse Current
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN-EP (3x3)
MAX4834ETT18C FAQ
1.How can I place an order for MAX4834ETT18C through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4834ETT18C 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 MAX4834ETT18C reliable?
The price and inventory of MAX4834ETT18C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4834ETT18C is usually 5 days.
3.What payment methods are accepted for MAX4834ETT18C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4834ETT18C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4834ETT18C?
MAX4834ETT18C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4834ETT18C 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 MAX4834ETT18C?
For technical support, including MAX4834ETT18C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4834ETT18C requirements.
6.How does Aetrix verify that MAX4834ETT18C is sourced from the original manufacturer or authorized distributors?
All MAX4834ETT18C 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 MAX4834ETT18C meets industry standards.
7.What is the process for return or replacement of MAX4834ETT18C?
All MAX4834ETT18C units undergo pre-shipment inspection (PSI). If there is an issue with MAX4834ETT18C, 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 MAX4834ETT18C part is unused and in its original packaging.
Return procedure for MAX4834ETT18C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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