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Analog Devices Inc./Maxim Integrated MAX8634ETA+T
- Part No.:
- MAX8634ETA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX8634ETA+T.pdf
- Description:
- IC REG LIN POS PROG 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
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Product details
Overview
The MAX8634ETA+T from Maxim Integrated is a dual 300mA low-dropout linear regulator with pin-programmable output voltages, ultra-low quiescent current (54µA typ), and low-noise operation (45µVRMS typ). It features independent SHDN1/SHDN2 inputs, a noise-bypass input (BP), and operates from 2.7V to 5.5V input supply - designed for power management in compact battery-powered systems such as wireless LAN cards and handheld instruments.
For engineers reviewing the MAX8634ETA+T datasheet, MAX8634ETA+T pinout, MAX8634ETA+T application, or MAX8634ETA+T equivalent, key selection criteria include its 3-output-voltage programmability via single logic input P, 90mV dropout at 100mA, thermal shutdown at +165°C, and compatibility with ceramic capacitors ≥2.2µF for stable regulation across –40°C to +85°C.
Technical Context
The MAX8634ETA+T integrates two independent p-channel MOSFET LDOs with internal 1.50V reference and error amplifiers. Each regulator uses a dedicated shutdown input (SHDN1/SHDN2) and supports three preset output-voltage combinations determined by the logic state of pin P (open/GND/IN), eliminating external feedback resistors.
It incorporates low-noise architecture via BP pin connected to a 0.01µF capacitor to ground, achieving 45µVRMS output noise (10Hz–100kHz). Thermal protection disables both outputs at +165°C with 15°C hysteresis, and current limiting caps each output at 400–600mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, Li-poly, or 3.3V/5V rail inputs without external level shifting. |
| Output Current per Channel | 300mA guaranteed - sufficient to power core logic, RF transceivers, or small LCD bias rails. |
| Dropout Voltage | 90mV at 100mA load - enables >97% efficiency at light-to-moderate loads and extends usable battery life. |
| Quiescent Current | 54µA typical (both LDOs active) - critical for always-on subsystems in portable devices. |
| Output Noise | 45µVRMS (10Hz–100kHz) with 0.01µF BP capacitor - meets low-noise requirements for ADC references or RF IC supplies. |
| Shutdown Current | <1µA max (SHDN1/SHDN2 = GND) - ensures zero-load leakage during deep sleep modes. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and extended commercial environments. |
Pinout & Package
MAX8634ETA+T is housed in an 8-pin, 3mm × 3mm TDFN package with exposed paddle (EP) for enhanced thermal dissipation. The EP must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator Input | Main power input (2.7V–5.5V); requires ≥2.2µF ceramic bypass to GND for stability. |
| 2 SHDN2 | LDO2 Shutdown Input | Active-low control for OUT2; logic low disables OUT2 independently while OUT1 remains operational. |
| 3 OUT2 | Regulator 2 Output | 300mA regulated output; voltage set by P pin state at power-on (2.60V/2.85V/3.00V). |
| 4 GND | Ground Reference | Common return path for IN, OUT1, OUT2, BP, and EP; must connect to low-impedance ground plane. |
| 5 OUT1 | Regulator 1 Output | 300mA regulated output; voltage matches OUT2 (2.60V/2.85V/3.00V) per Table 2. |
| 6 BP | Noise Bypass Input | Connects to internal reference; 0.01µF capacitor to GND reduces output noise to 45µVRMS. |
| 7 SHDN1 | LDO1 Shutdown Input | Active-low control for OUT1; allows independent sequencing or partial system power-down. |
| 8 P | Output-Voltage Programming Input | Tri-state logic input (open/GND/IN) selects one of three dual-output voltage pairs at power-up. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable dual outputs | Single P pin selects matched 2.60V/2.60V, 2.85V/2.85V, or 3.00V/2.85V outputs - eliminates 1% resistors and reduces BOM count. |
| Ultra-low-noise regulation | 45µVRMS output noise with BP capacitor - suitable for noise-sensitive analog/RF circuitry without additional filtering. |
| Independent shutdown control | Dedicated SHDN1 and SHDN2 pins enable flexible power sequencing and partial system wake-up. |
| p-Channel MOSFET pass devices | 0.9Ω RDS(ON) enables low dropout proportional to load - improves efficiency over pnp-based LDOs at all load levels. |
| Thermal and current protection | Auto-shutdown at +165°C (15°C hysteresis) and 400–600mA per-channel current limit - prevents damage under fault conditions. |
Applications
| Wireless LAN Cards | Handheld Instruments |
|---|---|
Use Scenario: Powering 2.85V RF transceiver and 3.00V baseband processor from shared 3.3V or Li-ion source. IC Role / Device Role / Timing Role: Dual-LDO regulator providing isolated, low-noise, sequenced supplies with independent shutdown. Use Value: Eliminates need for discrete regulators and noise filters; 45µVRMS noise ensures clean RF performance and accurate ADC sampling. |
Use Scenario: Supplying 2.60V sensor interface and 2.85V microcontroller core in portable multimeter or data logger. IC Role / Device Role / Timing Role: Low-quiescent dual regulator enabling long battery life and precise voltage setting without trimming resistors. Use Value: 54µA quiescent current extends runtime in standby; pin-programmability simplifies variant management across instrument models. |
| Small LCD Displays | Notebook Computers (Subsystem) |
Use Scenario: Generating 2.85V VDD and 3.00V VCOM for TFT bias in compact display modules. IC Role / Device Role / Timing Role: Compact dual-output LDO delivering matched, stable voltages with minimal board area. Use Value: 2mm × 2mm µDFN and 3mm × 3mm TDFN options allow layout flexibility; 90mV dropout preserves display operation near battery EOL. |
Use Scenario: Powering always-on USB controller (2.85V) and embedded security module (2.60V) in notebook chipset subsystem. IC Role / Device Role / Timing Role: Independent SHDN1/SHDN2 inputs support selective power gating during S3/S4 sleep states. Use Value: <1µA shutdown current minimizes battery drain; thermal shutdown protects against localized hotspots on dense motherboard layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8636ETA+ | Shares same 3mm × 3mm TDFN package, 9-output-voltage programming (P1/P2), BP pin, and 45µVRMS noise - but uses single SHDN pin instead of independent SHDN1/SHDN2. | Suitable where simultaneous shutdown of both outputs is acceptable; not ideal for asymmetric power sequencing. | Select MAX8636ETA+ when footprint and noise specs match but independent control is unnecessary. |
| TPS70251PWP | TI dual LDO in 20-pin TSSOP; fixed 3.3V/2.5V outputs, higher quiescent current (125µA), no BP pin, no programmability. | Requires external resistors for custom voltages; lacks low-noise capability and pin-programming flexibility. | Choose only if fixed-voltage, non-noise-critical dual regulation suffices and TSSOP layout is acceptable. |
Compared with MAX8634ETA+T, MAX8636ETA+ offers greater output-voltage flexibility but sacrifices independent shutdown control, while TPS70251PWP provides fixed outputs with higher IQ and no noise optimization - making MAX8634ETA+T optimal for compact, low-noise, and flexibly sequenced dual-rail designs.
Availability
MAX8634ETA+T is available at Aetrix Electronics and suitable for wireless LAN cards, handheld instruments, small LCD displays, and notebook subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8634ETA+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 space-constrained, battery-powered devices needing dual, low-noise, pin-programmable LDO regulation with minimal external components.
FAQ
What output voltage options does the MAX8634ETA+T support?
The MAX8634ETA+T supports three dual-output voltage combinations selected by the logic state of pin P: (2.60V, 2.60V) when P = IN, (2.85V, 2.85V) when P = open, and (3.00V, 2.85V) when P = GND. These values are fixed at power-on and cannot be changed dynamically without cycling power or asserting both SHDN1 and SHDN2 low.
How does the BP pin reduce output noise in the MAX8634ETA+T?
The BP pin connects to the internal voltage reference and forms a low-pass filter with an external 0.01µF ceramic capacitor to ground. This configuration suppresses reference noise, enabling the MAX8634ETA+T to achieve 45µVRMS output noise (10Hz–100kHz). Omitting the BP capacitor increases noise but reduces solution size and cost where noise sensitivity is low.
Can the MAX8634ETA+T operate with ceramic output capacitors smaller than 2.2µF?
Yes - for load currents below 150mA, the MAX8634ETA+T supports 1µF ceramic output capacitors per channel while maintaining stability. However, 2.2µF is recommended for full 300mA capability and optimal transient response. X7R or X5R dielectrics are required; Z5U/Y5V types may require larger values for low-temperature stability.
What is the maximum power dissipation of the MAX8634ETA+T in its TDFN package?
The MAX8634ETA+T in the 8-pin 3mm × 3mm TDFN package has a maximum continuous power dissipation of 1904mW at +70°C, derating by 23.8mW/°C above that temperature. Exceeding this limit triggers thermal shutdown at +165°C. Power dissipation must be calculated using PD = (VIN–VOUT1)×IOUT1 + (VIN–VOUT2)×IOUT2 to ensure safe operation.
Does the MAX8634ETA+T provide any built-in protection features?
Yes - the MAX8634ETA+T includes per-channel current limiting (400–600mA), thermal shutdown (+165°C with 15°C hysteresis), input undervoltage lockout (2.25V typical), and <1µA shutdown current. These protections ensure robust operation in portable and industrial environments without external circuitry.
MAX8634ETA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- 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-TDFN (3x3)
MAX8634ETA+T FAQ
1.How can I place an order for MAX8634ETA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8634ETA+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 MAX8634ETA+T reliable?
The price and inventory of MAX8634ETA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8634ETA+T is usually 5 days.
3.What payment methods are accepted for MAX8634ETA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8634ETA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8634ETA+T?
MAX8634ETA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8634ETA+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 MAX8634ETA+T?
For technical support, including MAX8634ETA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8634ETA+T requirements.
6.How does Aetrix verify that MAX8634ETA+T is sourced from the original manufacturer or authorized distributors?
All MAX8634ETA+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 MAX8634ETA+T meets industry standards.
7.What is the process for return or replacement of MAX8634ETA+T?
All MAX8634ETA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8634ETA+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 MAX8634ETA+T part is unused and in its original packaging.
Return procedure for MAX8634ETA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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