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Analog Devices Inc./Maxim Integrated MAX8635ELA+
- Part No.:
- MAX8635ELA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN
- Datasheet:
-
MAX8635ELA+.pdf
- Description:
- IC REG LIN POS PROG 300MA 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,403
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Product details
Overview
MAX8635ELA+ from Maxim Integrated is a dual 300mA low-dropout linear regulator with independent shutdown control (SHDN1/SHDN2), pin-programmable output voltages (nine preset combinations), 90mV dropout at 100mA, and 54µA quiescent current - designed for space-constrained battery-powered systems such as digital cameras and wireless LAN cards.
For engineers reviewing the MAX8635ELA+ datasheet, MAX8635ELA+ pinout, MAX8635ELA+ application, or MAX8635ELA+ equivalent, this page delivers verified electrical parameters, validated µDFN-8 package mapping, confirmed dual-LDO shutdown behavior, and real-world selection guidance against functionally aligned alternatives.
Technical Context
The MAX8635ELA+ integrates two independent p-channel MOSFET pass transistors with internal 1.50V reference and error amplifiers to regulate OUT1 and OUT2. Output voltages are set at power-on by the logic states of P1 and P2 (open/GND/IN), enabling nine fixed combinations without external resistors.
Each regulator features independent current limiting (400–600mA min/max), thermal shutdown at +165°C with 15°C hysteresis, and undervoltage lockout (2.25V typ). Shutdown is controlled via separate active-low SHDN1 and SHDN2 inputs, allowing selective or simultaneous disablement of either output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, Li-polymer, and regulated 3.3V/5V rails without external pre-regulation. |
| Output Current per Channel | 300mA guaranteed - sufficient to power core logic, memory, and RF sections in portable devices. |
| Dropout Voltage | 90mV at 100mA load - enables extended battery runtime by maintaining regulation down to VOUT + 90mV input. |
| Quiescent Current | 54µA typical (both LDOs on) - minimizes standby power loss in always-on subsystems. |
| Output Voltage Accuracy | ±1.8% over load/temperature - ensures stable supply to sensitive analog and mixed-signal circuits. |
| Shutdown Current | <1µA max (both SHDN1/SHDN2 low) - meets ultra-low-power requirements for deep-sleep modes. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
MAX8635ELA+ is housed in an 8-pin, 2mm × 2mm µDFN package with exposed paddle (EP) for thermal dissipation. The package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input supply | Accepts 2.7V–5.5V input; requires ≥2.2µF ceramic bypass capacitor to GND for stability. |
| 2 SHDN1 | LDO1 shutdown control | Active-low input; drives OUT1 into high-impedance state when pulled low (≤0.5V). |
| 3 SHDN2 | LDO2 shutdown control | Active-low input; drives OUT2 into high-impedance state when pulled low (≤0.5V). |
| 4 P2 | Output voltage programming input 2 | One of two tri-level inputs (open/GND/IN) that selects one of nine OUT1/OUT2 voltage pairs at power-on. |
| 5 P1 | Output voltage programming input 1 | Second tri-level input; combined with P2, determines preset output voltages per Table 3 in datasheet. |
| 6 GND | Power and signal ground | Common return path; must be connected to low-impedance PCB ground plane. |
| 7 OUT2 | Regulator 2 output | Delivers up to 300mA; requires ≥2.2µF ceramic output capacitor for stability and transient response. |
| 8 OUT1 | Regulator 1 output | Delivers up to 300mA; independently regulated and shutdown-capable from OUT2. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent shutdown control | Separate SHDN1/SHDN2 pins enable selective power gating of each LDO - critical for multi-rail power sequencing in portable SoC designs. |
| Nine preset output-voltage combinations | P1/P2 tri-level configuration eliminates need for 1% feedback resistors - reduces BOM count and layout complexity in high-mix production. |
| Low 90mV dropout at 100mA | p-Channel MOSFET pass element provides load-proportional dropout - extends usable battery voltage range beyond bipolar-based regulators. |
| 54µA quiescent current (both LDOs active) | Enables >1-year battery life in always-on sensor nodes or backup power domains with microamp-level sleep currents. |
| Thermal shutdown with 15°C hysteresis | Prevents permanent damage during sustained overload or poor heatsinking; automatic recovery avoids system latch-up. |
Applications
| Cellular Phone Power Management | Digital Camera Core Supply |
|---|---|
Use Scenario: Dual-rail power delivery to baseband processor (1.8V) and camera ISP (2.8V) from shared Li-ion battery. IC Role / Device Role / Timing Role: Dual LDO providing isolated, low-noise, sequenced outputs with independent enable control. Use Value: Eliminates discrete regulators and resistor networks while meeting tight voltage accuracy (±1.8%) and dropout constraints (<100mV) across temperature. |
Use Scenario: Powering CMOS image sensor analog front-end and digital controller from 3.7V battery. IC Role / Device Role / Timing Role: Regulating 2.8V for sensor bias and 1.5V for digital core with independent shutdown during idle periods. Use Value: Achieves 300mA per rail with 54µA quiescent current - directly extending capture session duration and standby time. |
| Wireless LAN Card Voltage Scaling | Handheld Instrument Dual-Rail Bias |
Use Scenario: Generating 3.0V for RF transceiver and 2.6V for baseband MCU in mini-PCIe WLAN module. IC Role / Device Role / Timing Role: Pin-programmed dual LDO delivering precise, stable rails with no external feedback components. Use Value: Nine factory-set voltage combinations allow single BOM SKU to support multiple regional RF IC variants without redesign. |
Use Scenario: Supplying 2.85V to precision ADC and 2.60V to microcontroller in battery-operated multimeter. IC Role / Device Role / Timing Role: Low-drift, low-noise dual regulator ensuring measurement integrity and long calibration intervals. Use Value: ±1.8% output accuracy and 90mV dropout preserve full battery voltage range - critical for unattended field operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8636ELA+ | Single SHDN input (not independent); includes BP pin for noise bypass (0.01µF), enabling 45µVRMS output noise. | Preferred where low-noise analog supply is required (e.g., audio codec, precision sensor), but sacrifices independent shutdown flexibility. | Select MAX8636ELA+ only if noise performance outweighs need for per-rail power control. |
| TPS7A2020PDQNR | Single-output 300mA LDO (not dual); 165mV dropout at 300mA; 6.5µA quiescent current; no pin-programmable outputs. | Suitable for simpler single-rail systems; lacks voltage programming and dual-channel integration - requires two devices for dual-rail use. | Choose TPS7A2020PDQNR only when footprint and cost favor discrete single-channel solutions over integrated dual-LDO architecture. |
Compared with MAX8635ELA+, MAX8636ELA+ trades independent shutdown for lower noise, while TPS7A2020PDQNR offers ultra-low IQ but requires duplication for dual-rail designs - making MAX8635ELA+ optimal for compact, flexible, medium-noise dual-supply systems.
Availability
MAX8635ELA+ is available at Aetrix Electronics and suitable for cellular phones, digital cameras, and wireless LAN cards requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX8635ELA+ 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 was engineered specifically for space- and power-constrained battery-powered devices needing dual, pin-configurable, low-quiescent LDOs in sub-4mm² packages.
FAQ
What is the maximum output current capability of each channel in the MAX8635ELA+?
The MAX8635ELA+ delivers up to 300mA from both OUT1 and OUT2 simultaneously, provided total power dissipation remains within the 380mW limit of the 2mm × 2mm µDFN package. Current limiting is independently implemented per channel, with minimum trip point of 400mA and typical value of 500mA - protecting downstream circuitry during short-circuit or overload events without affecting the other regulator.
How are output voltages configured on the MAX8635ELA+?
Output voltages on the MAX8635ELA+ are set at power-on using the logic states of P1 and P2, which accept open, GND, or IN connections to select one of nine predefined OUT1/OUT2 voltage pairs (e.g., 2.80V/1.50V, 3.00V/2.80V). These settings are latched and remain fixed until power cycle or simultaneous assertion of SHDN1 and SHDN2 - eliminating need for external 1% resistors and reducing design iteration time.
Does the MAX8635ELA+ support independent shutdown of each regulator?
Yes, the MAX8635ELA+ provides fully independent shutdown control via dedicated active-low SHDN1 and SHDN2 inputs. Driving SHDN1 low disables only OUT1 while OUT2 remains active; driving SHDN2 low disables only OUT2; asserting both places the device in ultra-low-power state with ≤1µA supply current. This enables precise power sequencing and dynamic rail management in multi-domain SoC systems.
What is the dropout voltage specification for the MAX8635ELA+ and how does it vary with load?
The MAX8635ELA+ exhibits a typical dropout voltage of 90mV at 100mA load per channel, rising to 200mV maximum under same conditions. As a p-channel MOSFET-based regulator, its dropout scales linearly with load current due to RDS(ON) - e.g., ~45mV at 50mA and ~180mV at 200mA. This behavior maximizes battery utilization compared to fixed-dropout bipolar regulators, especially in partial-load operating modes.
Is the MAX8635ELA+ compatible with ceramic output capacitors, and what values are recommended?
Yes, the MAX8635ELA+ is optimized for ceramic output capacitors. A minimum of 2.2µF per output is required for stable operation across –40°C to +85°C; X7R or X5R dielectrics are recommended for consistent ESR and capacitance. For loads <150mA, 1µF may suffice. Lower-ESR ceramics improve transient response and PSRR - critical for powering noise-sensitive analog blocks like ADCs or RF synthesizers alongside the MAX8635ELA+.
MAX8635ELA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Bulk
- 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):
- 3V, 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
- 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-uDFN (2x2)
MAX8635ELA+ FAQ
1.How can I place an order for MAX8635ELA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8635ELA+ 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 MAX8635ELA+ reliable?
The price and inventory of MAX8635ELA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8635ELA+ is usually 5 days.
3.What payment methods are accepted for MAX8635ELA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8635ELA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8635ELA+?
MAX8635ELA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8635ELA+ 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 MAX8635ELA+?
For technical support, including MAX8635ELA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8635ELA+ requirements.
6.How does Aetrix verify that MAX8635ELA+ is sourced from the original manufacturer or authorized distributors?
All MAX8635ELA+ 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 MAX8635ELA+ meets industry standards.
7.What is the process for return or replacement of MAX8635ELA+?
All MAX8635ELA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8635ELA+, 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 MAX8635ELA+ part is unused and in its original packaging.
Return procedure for MAX8635ELA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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