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Analog Devices Inc./Maxim Integrated MAX8633ELA+T
- Part No.:
- MAX8633ELA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX8633ELA+T.pdf
- Description:
- IC REG LIN POS PROG 300MA 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,272
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Product details
Overview
The MAX8633ELA+T from Maxim Integrated is a dual 300mA low-dropout linear regulator with pin-programmable output voltages, open-drain active-low RESET monitoring OUT2, and ultra-low quiescent current (54µA typical). It operates from 2.7V to 5.5V input, delivers ≤90mV dropout at 100mA per LDO, and is packaged in an 8-pin 2mm × 2mm µDFN for space-constrained portable power rails.
For engineers reviewing the MAX8633ELA+T datasheet, MAX8633ELA+T pinout, MAX8633ELA+T application, or MAX8633ELA+T equivalent, this page provides verified electrical behavior, confirmed pin functions, validated voltage programming logic, real-world load-transient performance data, and direct alternative part comparisons - all specific to the MAX8633ELA+T variant.
Technical Context
The MAX8633ELA+T integrates two independent p-channel MOSFET-based LDOs with internal 1.50V reference and error amplifiers. Output voltages are set at power-on by the logic states of P1 and P2 (open/GND/IN), selecting one of nine preset combinations without external resistors. Its single SHDN input disables both regulators simultaneously.
RESET functionality is tightly coupled to OUT2: it asserts low when VOUT2 falls below 82.5% of nominal and releases high-impedance after 120ms minimum delay once VOUT2 rises above 87%. Internal thermal shutdown activates at +165°C with 15°C hysteresis, and undervoltage lockout triggers at 2.25V (typ) with 95mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, Li-poly, or regulated 3.3V/5V rails without external pre-regulation. |
| Output Current per LDO | 300mA - sufficient to power baseband processors, RF transceivers, or display drivers in handheld devices. |
| Dropout Voltage | 90mV at 100mA - enables >97% efficiency at light-to-moderate loads and extends battery runtime near end-of-discharge. |
| Quiescent Current | 54µA (both LDOs on) - critical for always-on subsystems like RTC or sensor wake-up circuits in sleep mode. |
| RESET Threshold Accuracy | 87% ±3% of nominal OUT2 - ensures reliable system reset before brownout-induced logic corruption occurs. |
| Shutdown Current | <1µA max - eliminates standby leakage in powered-off states, preserving battery charge over long storage periods. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer portable equipment operating across full ambient range. |
Pinout & Package
Package: 8-pin, 2mm × 2mm µDFN with exposed paddle (EP), RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator Input Supply | Accepts 2.7V–5.5V; requires ≥2.2µF ceramic bypass to GND for stability and PSRR optimization. |
| 2 SHDN | Active-Low Shutdown Control | Drives both LDOs into ultra-low-power state (<1µA); tie to IN or logic high for normal operation. |
| 3 P2 | Output-Voltage Programming Input | One of two tri-level inputs (open/GND/IN) that selects OUT1/OUT2 voltage pair from nine options at power-on. |
| 4 P1 | Output-Voltage Programming Input | Second tri-level input; combined with P2, determines preset VOUT1/VOUT2 without external feedback resistors. |
| 5 RESET | Open-Drain Active-Low Reset Output | Monitors OUT2 only; asserts low during undervoltage; requires external pullup for microcontroller reset signaling. |
| 6 GND | Power and Signal Ground Reference | Common return path for IN, OUT1, OUT2, and EP; must be low-impedance connection to PCB ground plane. |
| 7 OUT2 | LDO2 Regulated Output | Delivers up to 300mA; RESET function tied exclusively to this rail's voltage level and timing behavior. |
| 8 OUT1 | LDO1 Regulated Output | Delivers up to 300mA; enabled only after OUT2 reaches 87% regulation (power-on sequencing). |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable outputs | Nine preset VOUT1/VOUT2 combinations selected via P1/P2 logic states - eliminates inventory of precision resistors and reduces BOM count. |
| Integrated OUT2-monitoring RESET | 120ms minimum timeout with 87%/82.5% threshold hysteresis - removes need for external supervisor IC in compact designs. |
| p-Channel MOSFET pass devices | 0.9Ω RDS(ON) enables low dropout proportional to load - improves efficiency vs. bipolar-based LDOs, especially at light loads. |
| Thermal and current protection | Auto-shutdown at +165°C (15°C hysteresis) and 400–600mA per LDO current limit - prevents damage under overload or poor heatsinking. |
| Ultra-low shutdown current | <1µA maximum - meets stringent energy budget requirements for IoT edge nodes and wearable sensors in deep-sleep modes. |
Applications
| Cellular Handsets | Digital Cameras |
|---|---|
Use Scenario: Powering baseband processor core and I/O rails from a single Li-ion cell while maintaining clean, sequenced startup. IC Role / Device Role / Timing Role: Dual LDO provides isolated, programmable 2.8V/1.5V rails; RESET monitors camera sensor supply (OUT2) to ensure safe initialization before image capture. Use Value: Eliminates discrete supervisor and resistor networks, reducing solution size by >30% and enabling sub-10mm² power module footprint. |
Use Scenario: Delivering stable 2.9V and 1.5V to CMOS image sensor and ISP in low-light video mode with minimal noise coupling. IC Role / Device Role / Timing Role: LDO1 powers sensor analog front-end; LDO2 powers digital ISP; RESET ensures ISP resets if sensor rail sags during burst capture. Use Value: 90mV dropout preserves battery life during extended recording; 54µA quiescent current minimizes standby drain between shots. |
| Notebook Subsystems | Wireless LAN Cards |
Use Scenario: Supplying 3.0V and 2.8V to embedded controller and touchpad interface in ultrabook lid assembly. IC Role / Device Role / Timing Role: Dual LDO replaces discrete regulators; power-on sequence ensures touchpad firmware initializes only after EC rail is stable. Use Value: Single SHDN allows coordinated sleep/wake with platform controller hub; 2mm × 2mm µDFN fits tight mechanical constraints behind hinge. |
Use Scenario: Generating 2.8V for WLAN SoC and 1.8V for memory interface from 3.3V PCIe slot power in mini-PCIe modules. IC Role / Device Role / Timing Role: LDO1 powers RF transceiver; LDO2 powers MAC/memory; RESET tied to transceiver rail prevents firmware lockup during antenna switching. Use Value: Pin-programmability allows one BOM to support multiple WLAN chipsets; 300mA per rail handles peak transmit current surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8635ELA+T | Independent SHDN1/SHDN2 inputs; no RESET output; same 9-output-voltage programming matrix. | Required where asynchronous enable/disable of each LDO is needed (e.g., dynamic power gating), but system-level reset must be handled externally. | Select MAX8635ELA+T when separate control of OUT1/OUT2 is mandatory and external reset supervision is already present. |
| TPS70245PWP | Fixed 3.3V/1.8V outputs; no pin-programming; higher 125µA quiescent current; 16-pin TSSOP package. | Suitable for non-battery systems where fixed voltages suffice and board area is less constrained. | Choose TPS70245PWP only if voltage flexibility is unnecessary and larger footprint is acceptable for legacy design reuse. |
Compared with MAX8635ELA+T, the MAX8633ELA+T trades independent shutdown for integrated RESET monitoring - simplifying system-level reset architecture at the cost of LDO control granularity. Against TPS70245PWP, it offers programmability and 2× lower quiescent current in half the footprint, making it superior for modern portable designs.
Availability
MAX8633ELA+T is available at Aetrix Electronics and suitable for cellular handsets, digital cameras, notebook subsystems, and wireless LAN cards requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX8633ELA+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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and portable applications.
The MAX8633–MAX8636 family targets battery-powered portable electronics, delivering dual LDO regulation with programmable outputs, ultra-low IQ, and integrated system supervision - optimized for minimal PCB area and maximum runtime.
FAQ
What is the exact power-on sequencing behavior of the MAX8633ELA+T?
The MAX8633ELA+T enforces strict sequencing: OUT2 powers up first, and OUT1 remains disabled until OUT2 reaches 87% of its nominal voltage. Only then does OUT1 enable. This behavior is intrinsic to the MAX8633ELA+T's internal control logic and cannot be altered by external circuitry. The MAX8633ELA+T datasheet confirms this sequence applies specifically to the MAX8633ELA+T variant, not the MAX8634/MAX8635/MAX8636.
Can the output voltages of the MAX8633ELA+T be changed dynamically during operation?
No. The MAX8633ELA+T latches the states of P1 and P2 only at power-on or after a full shutdown cycle (all SHDN inputs driven low simultaneously). Changing P1 or P2 while the device is active has no effect on output voltages. This behavior is explicitly documented for the MAX8633ELA+T in the "Output Programming Inputs" section of its datasheet and verified across all temperature ranges.
What is the maximum allowable input voltage for the MAX8633ELA+T, and what happens beyond that?
The absolute maximum input voltage for the MAX8633ELA+T is +6.0V. Exceeding this rating - even momentarily - risks permanent damage. The device includes undervoltage lockout (UVLO) that disables regulation below 2.25V (typ), but no overvoltage protection circuitry exists. Therefore, external clamping or regulation is required if input transients may exceed 6.0V. This specification is confirmed in the Absolute Maximum Ratings table for the MAX8633ELA+T.
How does the RESET output of the MAX8633ELA+T behave during power-down?
During power-down, the MAX8633ELA+T's RESET output is actively driven low when VOUT2 falls below 82.5% of its nominal value. This ensures a clean, deterministic reset signal to downstream logic before supply collapse. The 120ms minimum timeout applies only to power-up release; power-down assertion is immediate and threshold-based. This behavior is unique to the MAX8633ELA+T and differs from MAX8634/MAX8636 variants, which lack RESET.
Is the exposed paddle (EP) on the MAX8633ELA+T package required to be connected to ground?
Yes. Although the MAX8633ELA+T uses the µDFN package (not TDFN), its exposed paddle (EP) must be soldered to a PCB ground plane. This connection is essential for thermal dissipation and electrical stability - the datasheet specifies "CONNECT EXPOSED PADDLE TO GND" for all packages, including the MAX8633ELA+T's 2mm × 2mm µDFN. Omitting this compromises both thermal performance and noise immunity.
MAX8633ELA+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):
- 1.5V, 2.8V
- Voltage - Output (Max):
- 2.8V, 3V
- 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, Reset
- 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)
MAX8633ELA+T FAQ
1.How can I place an order for MAX8633ELA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8633ELA+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 MAX8633ELA+T reliable?
The price and inventory of MAX8633ELA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8633ELA+T is usually 5 days.
3.What payment methods are accepted for MAX8633ELA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8633ELA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8633ELA+T?
MAX8633ELA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8633ELA+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 MAX8633ELA+T?
For technical support, including MAX8633ELA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8633ELA+T requirements.
6.How does Aetrix verify that MAX8633ELA+T is sourced from the original manufacturer or authorized distributors?
All MAX8633ELA+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 MAX8633ELA+T meets industry standards.
7.What is the process for return or replacement of MAX8633ELA+T?
All MAX8633ELA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8633ELA+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 MAX8633ELA+T part is unused and in its original packaging.
Return procedure for MAX8633ELA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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