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Analog Devices Inc./Maxim Integrated MAX8634ELA+T
- Part No.:
- MAX8634ELA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX8634ELA+T.pdf
- Description:
- IC REG LIN POS PROG 300MA 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,811
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Product details
Overview
MAX8634ELA+T from Maxim Integrated is a dual 300mA pin-programmable LDO linear regulator in an 8-pin 2mm × 2mm µDFN package, operating from 2.7V to 5.5V input with 90mV typical dropout at 100mA and 45µVRMS output noise (10Hz–100kHz). It features independent SHDN1/SHDN2 control, BP noise-bypass input, and three preset output-voltage combinations selected by logic-level P input - used in wireless LAN cards and handheld instruments requiring low-noise dual-rail power.
For engineers reviewing the MAX8634ELA+T datasheet, MAX8634ELA+T pinout, MAX8634ELA+T application, or MAX8634ELA+T equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed voltage-programming behavior, thermal shutdown thresholds, and real-world supply-current vs. load curves - all specific to the MAX8634ELA+T variant.
Technical Context
The MAX8634ELA+T integrates two independent p-channel MOSFET pass transistors with internal 1.50V reference and error amplifiers, enabling low-quiescent operation (54µA typ, both LDOs on) and precise regulation without external resistors. Its BP pin connects to a 0.01µF capacitor to form a low-pass filter that reduces reference noise, directly enabling the 45µVRMS output noise specification.
Shutdown is controlled via separate active-low SHDN1 and SHDN2 inputs, allowing independent enable/disable of OUT1 and OUT2. Output voltages are set at power-on by the tri-state P input (open/GND/IN), locking configuration until power cycle or simultaneous SHDN assertion - no runtime reconfiguration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, Li-poly, and 3.3V/5V system rails without external level shifting. |
| Output Current per Channel | 300mA guaranteed - sufficient for baseband processors, RF front-ends, or sensor subsystems in portable devices. |
| Dropout Voltage | 90mV (typ, 100mA load) - enables >97% efficiency at 3.3V output from 3.4V input, extending battery runtime. |
| Output Noise | 45µVRMS (10Hz–100kHz) - achieved via BP pin + 0.01µF capacitor; critical for noise-sensitive analog/RF circuits. |
| Quiescent Current | 54µA (typ, both LDOs active) - minimizes standby drain in always-on subsystems like Bluetooth/Wi-Fi coexistence modules. |
| Shutdown Current | <1µA max (SHDN1 & SHDN2 low) - meets ultra-low-power requirements for deep-sleep modes in handheld instruments. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and extended commercial environments including automotive infotainment peripherals. |
Pinout & Package
Package: 8-pin, 2mm × 2mm µDFN with exposed paddle (EP), RoHS-compliant, lead-free. Thermal performance optimized via EP soldered to PCB ground plane.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator Input | Primary power rail input (2.7V–5.5V); requires ≥2.2µF ceramic bypass to GND for stability. |
| 2 SHDN2 | LDO2 Shutdown Input | Active-low control for OUT2 only; logic low disables OUT2 while OUT1 remains operational. |
| 3 SHDN1 | LDO1 Shutdown Input | Active-low control for OUT1 only; independent of SHDN2, enabling asymmetric power sequencing. |
| 4 P | Output-Voltage Programming Input | Tri-state (open/GND/IN) selects one of three fixed OUT1/OUT2 voltage pairs at power-on. |
| 5 BP | Noise Bypass Input | Connects to internal reference; 0.01µF capacitor to GND reduces output noise to 45µVRMS. |
| 6 GND | Ground Reference | Common return path for input/output capacitors and thermal dissipation via exposed paddle. |
| 7 OUT2 | Regulator 2 Output | 300mA-capable output; voltage set by P state; requires ≥2.2µF ceramic capacitor to GND. |
| 8 OUT1 | Regulator 1 Output | 300mA-capable output; voltage set identically to OUT2 by same P state; independent current limiting. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable output voltages | Three preset VOUT1/VOUT2 pairs (e.g., 2.85V/2.85V, 3.00V/2.85V, 2.60V/2.60V) selected by single P input - eliminates 1% feedback resistors and inventory overhead. |
| Low-noise regulation | 45µVRMS output noise enabled by BP pin + 0.01µF capacitor - meets stringent noise requirements for RF receivers and precision ADCs. |
| Independent shutdown control | Separate SHDN1 and SHDN2 inputs allow dynamic power gating of each output - essential for multi-rail SoC power management. |
| Thermal protection | Automatic shutdown at +165°C junction temperature with 15°C hysteresis - prevents damage during sustained high-load or poor heatsinking conditions. |
| Current limiting | 400mA min / 500mA typ per output - protects downstream circuitry during short-circuit or overload events without external components. |
Applications
| Wireless LAN Cards | Handheld Instruments |
|---|---|
Use Scenario: Dual-rail power for 802.11a/b/g/n baseband IC and RF transceiver in compact M.2 or mini-PCIe modules. IC Role / Device Role / Timing Role: Provides isolated, low-noise 2.85V for RF section and 3.00V for digital baseband - configured via P input at boot. Use Value: 45µVRMS noise ensures clean local oscillator synthesis; independent SHDN1/SHDN2 enables fast Wi-Fi sleep/wake transitions. |
Use Scenario: Portable multimeter or spectrum analyzer with microcontroller, display driver, and analog front-end. IC Role / Device Role / Timing Role: Supplies regulated 2.85V to MCU core and 2.60V to precision ADC reference - set once at power-up via P pin. Use Value: 54µA quiescent current extends battery life in standby; thermal shutdown prevents overheating during extended measurements. |
| Small LCD Displays | Notebook Computers |
Use Scenario: Backlight LED driver bias and display controller power in sub-10" embedded displays. IC Role / Device Role / Timing Role: Delivers stable 3.00V to display controller and 2.85V to gate driver IC - both outputs sequenced independently. Use Value: 90mV dropout allows operation down to 3.1V input, maximizing usable battery voltage range in coin-cell or Li-ion systems. |
Use Scenario: Auxiliary power for embedded controller (EC), keyboard controller, or secure boot module in ultrabook platforms. IC Role / Device Role / Timing Role: Generates tightly regulated 2.85V/2.85V dual rail from main 3.3V system bus - immune to switching noise via BP filtering. Use Value: Low 1µA shutdown current meets ACPI S5 (soft-off) requirements; −40°C to +85°C rating supports fanless designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8636ELA+T | Same 2mm × 2mm µDFN package and 45µVRMS noise, but uses shared SHDN and P1/P2 programming (9 voltage options). | Requires single SHDN signal and two programming pins instead of MAX8634ELA+T's dual SHDN and single P pin. | Select MAX8636ELA+T when system design favors unified shutdown control and wider voltage flexibility over independent channel gating. |
| TPL7407LADGQR | 7-channel 400mA NMOS-based LDO array in 16-pin WQFN; higher IQ (120µA), no BP pin, no programmable outputs. | Fixed 3.3V/2.8V/1.8V outputs; lacks pin-programmability and low-noise BP capability - not suitable for RF-sensitive use cases. | Choose TPL7407LADGQR only for cost-sensitive, non-noise-critical multi-rail applications where footprint and channel count outweigh noise/performance needs. |
Compared with MAX8634ELA+T, MAX8636ELA+T trades independent shutdown for greater voltage selection granularity, while TPL7407LADGQR sacrifices noise performance and programmability for channel density - making MAX8634ELA+T optimal for dual-rail, low-noise, independently controllable power in space-constrained portable electronics.
Availability
MAX8634ELA+T is available at Aetrix Electronics and suitable for wireless LAN cards, handheld instruments, small LCD displays, notebook computers, and cellular phone subsystems requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX8634ELA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX8633–MAX8636 family was designed specifically for battery-powered portable electronics needing dual, low-noise, pin-configurable LDOs with minimal external components and ultra-low quiescent current.
FAQ
What output voltage combinations does the MAX8634ELA+T support?
The MAX8634ELA+T supports three fixed output-voltage pairs selected by the tri-state P input: (2.85V, 2.85V) when P is open, (3.00V, 2.85V) when P = IN, and (2.60V, 2.60V) when P = GND. These values are factory-trimmed and guaranteed across −40°C to +85°C; no external resistors are required. The MAX8634ELA+T does not support runtime reprogramming - voltage selection occurs only at power-on or after simultaneous SHDN1/SHDN2 assertion.
How does the BP pin reduce output noise in the MAX8634ELA+T?
The BP pin in the MAX8634ELA+T connects internally to the voltage reference node; adding a 0.01µF ceramic capacitor from BP to GND forms a low-pass RC filter that attenuates reference noise, directly enabling the 45µVRMS output noise specification (10Hz–100kHz). Omitting the BP capacitor increases output noise to ~60µVRMS. The MAX8634ELA+T datasheet confirms this behavior is exclusive to MAX8634/MAX8636 variants - MAX8633 and MAX8635 lack BP functionality.
What is the maximum allowable input voltage for the MAX8634ELA+T?
The absolute maximum input voltage for the MAX8634ELA+T is +6.0V, but the recommended operating range is 2.7V to 5.5V per the datasheet's Electrical Characteristics table. Exceeding 5.5V risks violating the specified input undervoltage lockout (UVLO) hysteresis and may degrade long-term reliability. The device includes internal UVLO that disables regulators if VIN drops below 2.25V (typ), ensuring clean startup and brownout recovery - a feature confirmed for the MAX8634ELA+T in the Absolute Maximum Ratings and Functional Diagram sections.
Does the MAX8634ELA+T provide independent current limiting on each output?
Yes, the MAX8634ELA+T provides independent current limiting for OUT1 and OUT2, with a minimum limit of 400mA and typical limit of 500mA per channel. This is verified in the Electrical Characteristics table under "Current Limit (ILIM)" and confirmed in the Detailed Description section, which states "independent current limiting for OUT1 and OUT2." The current limit activates when the respective output is shorted to GND, protecting both the IC and downstream circuitry without affecting the other regulator's operation.
Can the MAX8634ELA+T be used in automotive applications?
The MAX8634ELA+T is specified for −40°C to +85°C operation and is RoHS-compliant, but it is not AEC-Q200 qualified and lacks automotive-specific validation (e.g., extended temperature testing to +105°C, vibration/shock qualification, or PPAP documentation). While it may function in cabin-temperature automotive accessories like infotainment USB hubs or Bluetooth adapters, Maxim does not guarantee performance beyond the stated industrial temperature range. For under-hood or safety-critical applications, an AEC-Q200-qualified alternative is required - the MAX8634ELA+T datasheet makes no automotive claims.
MAX8634ELA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Programmable
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.6V, 2.6V
- Voltage - Output (Max):
- 2.85V, 2.85V
- Voltage Dropout (Max):
- 0.2V @ 100mA, 0.2V @ 100mA
- Current - Output:
- 300mA, 300mA
- Current - Quiescent (Iq):
- 75 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB ~ 55dB (1kHz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µDFN (2x2)
MAX8634ELA+T FAQ
1.How can I place an order for MAX8634ELA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8634ELA+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 MAX8634ELA+T reliable?
The price and inventory of MAX8634ELA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8634ELA+T is usually 5 days.
3.What payment methods are accepted for MAX8634ELA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8634ELA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8634ELA+T?
MAX8634ELA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8634ELA+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 MAX8634ELA+T?
For technical support, including MAX8634ELA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8634ELA+T requirements.
6.How does Aetrix verify that MAX8634ELA+T is sourced from the original manufacturer or authorized distributors?
All MAX8634ELA+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 MAX8634ELA+T meets industry standards.
7.What is the process for return or replacement of MAX8634ELA+T?
All MAX8634ELA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8634ELA+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 MAX8634ELA+T part is unused and in its original packaging.
Return procedure for MAX8634ELA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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