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Analog Devices Inc./Maxim Integrated MAX8559EBA11+
- Part No.:
- MAX8559EBA11+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFBGA, CSPBGA
- Datasheet:
-
MAX8559EBA11+.pdf
- Description:
- IC REG LINEAR DUAL LOW NOISE
- Quantity:
- Payment:
- Shipping:
Inventory:1,861
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Product details
Overview
MAX8559EBA11+ from Maxim Integrated is a dual, low-noise, low-dropout linear regulator delivering two independent 1.85V outputs at up to 300mA each, operating from 2.5V–6.5V input. It features 32µVRMS output noise, 70dB PSRR at 10kHz, and 60mV dropout at 100mA load-designed for battery-powered portable electronics requiring clean, stable dual-rail power.
For engineers reviewing the MAX8559EBA11+ datasheet, MAX8559EBA11+ pinout, MAX8559EBA11+ application, or MAX8559EBA11+ equivalent, key selection factors include factory-preset 1.85V/1.85V outputs, independent logic-controlled shutdown (SHDNA/SHDNB), UCSP package footprint (2mm × 1mm), and operation without mandatory bypass capacitor on BP.
Technical Context
The MAX8559EBA11+ integrates two independent P-channel MOSFET pass transistors (RDS(ON) ≈ 0.6Ω) with internal 1.25V bandgap reference and error amplifiers. Each LDO uses an internal resistor divider to set its fixed 1.85V output, eliminating external feedback components.
Shutdown control is fully decoupled: SHDNA independently disables OUTA, SHDNB disables OUTB, and both low disable the internal reference-reducing supply current to 0.01µA. Thermal protection activates at +160°C with 10°C hysteresis, and each output includes autonomous current limiting (310mA min).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.85V per channel (factory-preset, no external resistors required) |
| Max Output Current | 300mA per LDO (supports 4.7µF ceramic output capacitor) |
| Dropout Voltage | 60mV at 100mA load (enables extended battery runtime near end-of-discharge) |
| Output Noise | 32µVRMS (100Hz–100kHz, with 0.01µF BP capacitor) |
| PSRR | 70dB at 10kHz (rejects switching noise from adjacent DC-DC stages) |
| Quiescent Current | 115µA per LDO (load-independent, enables ultra-low-power standby) |
| Input Voltage Range | 2.5V to 6.5V (compatible with single Li-ion, dual alkaline, or regulated 3.3V/5V rails) |
Pinout & Package
MAX8559EBA11+ is packaged in an 8-bump UCSP (2.06mm × 1.03mm, B8-1) with exposed die attach pad not connected to any internal node-requires PCB ground connection for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INA | LDO A Input | Shared input rail for both regulators; must be bypassed with ≥2.2µF ceramic capacitor to GND |
| SHDNA | Shutdown A Control | Logic-low disables OUTA; high-Z when floating; connect to INA for always-on operation |
| SHDNB | Shutdown B Control | Logic-low disables OUTB; independent of SHDNA; enables selective rail powering |
| INB | LDO B Input | Electrically tied to INA internally; same input voltage domain as INA |
| OUTB | LDO B Output | Delivers 1.85V/300mA; internally discharged via 385Ω to GND during shutdown |
| GND | Ground Reference | Common return for all circuitry; must be low-impedance connection to PCB ground plane |
| BP | Noise Bypass Terminal | Accepts 0.01µF ceramic capacitor to reduce output noise; optional if noise sensitivity is low |
| OUTA | LDO A Output | Delivers 1.85V/300mA; internally discharged via 385Ω to GND during shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables simultaneous 1.85V/1.85V rails for core + I/O domains without cross-talk |
| Low-noise regulation | 32µVRMS output noise supports noise-sensitive analog/RF circuits (e.g., ADCs, VCOs) |
| Independent shutdown inputs | Allows dynamic power gating of individual rails-critical for multi-sleep-state portable systems |
| P-channel MOSFET pass devices | Eliminates base-drive current loss; achieves 60mV dropout at 100mA and <220µA total IQ under load |
| Thermal + short-circuit protection | Auto-recovering shutdown prevents damage during overload or poor heatsinking (TJ > +160°C) |
Applications
| Cellular Handsets | Digital Cameras |
|---|---|
Use Scenario: Powering baseband processor core (1.85V) and camera sensor interface (1.85V) from a single Li-ion cell. IC Role / Device Role / Timing Role: Dual-rail LDO providing isolated, low-noise, and independently controllable voltage domains. Use Value: Eliminates need for two discrete regulators-reduces BOM count, PCB area, and quiescent current by 40% vs. single-channel alternatives. | Use Scenario: Supplying image signal processor (ISP) core and CMOS image sensor analog front-end from shared 3.6V battery rail. IC Role / Device Role / Timing Role: Low-noise dual LDO ensuring clean power for high-resolution image capture without digital noise coupling. Use Value: 32µVRMS noise and 70dB PSRR prevent switching artifacts in captured images under mixed-signal load conditions. |
| Notebook Subsystems | Wireless LAN Cards |
Use Scenario: Powering embedded controller (EC) and touchpad controller in ultraportable notebooks with aggressive power budgeting. IC Role / Device Role / Timing Role: Dual LDO with independent shutdown enabling EC wake-up while keeping touchpad rail off until user interaction. Use Value: 0.01µA deep-shutdown current (both SHDN low) extends battery life during suspend-to-RAM states. | Use Scenario: Delivering 1.85V to WLAN SoC RF section and baseband section in mini-PCIe form factor cards. IC Role / Device Role / Timing Role: Compact dual LDO meeting tight 2mm × 1mm footprint constraints while maintaining PSRR >65dB up to 100kHz. Use Value: TDFN/UCSP package compatibility allows drop-in use in space-constrained M.2 and NGFF modules without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS70245PWPR | Fixed 1.8V/3.3V dual outputs; higher 250µA IQ; requires external feedback for voltage adjustment | Not suitable for matched 1.85V rails; better for asymmetric voltage needs (e.g., core + I/O) | Select only if system requires non-matched outputs and can tolerate higher quiescent current. |
| MCP1826S-1802E/DB | Single 1.8V LDO (300mA); no dual-output or independent shutdown; SOT-23-5 package | Requires two devices for dual-rail operation; lacks shutdown isolation and noise performance | Use only for cost-sensitive, low-complexity designs where rail independence and noise are secondary. |
Compared with TPS70245PWPR and MCP1826S-1802E/DB, the MAX8559EBA11+ uniquely delivers matched 1.85V outputs with independent shutdown, 32µVRMS noise, and UCSP footprint-making it optimal for compact, battery-critical dual-rail systems where rail symmetry and ultra-low noise are mandatory.
Availability
MAX8559EBA11+ is available at Aetrix Electronics and suitable for cellular handsets, digital cameras, notebook subsystems, and wireless LAN cards requiring stable component supply across long-lifecycle portable designs.
Supply support for MAX8559EBA11+ 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 MAX8559 belongs to Maxim's low-noise LDO family, engineered specifically for battery-powered portable electronics needing dual, factory-set, low-quiescent-current regulation with minimal board area.
FAQ
What output voltages does the MAX8559EBA11+ provide?
The MAX8559EBA11+ provides two identical, factory-preset 1.85V outputs (VOUTA = VOUTB = 1.85V). This configuration is laser-trimmed during manufacturing and requires no external resistors. The "11" in the part number directly encodes this dual-1.85V option per the Output Voltage Selector Guide in the datasheet.
Can the MAX8559EBA11+ operate without the BP capacitor?
Yes, the MAX8559EBA11+ can operate without the 0.01µF BP capacitor. Omitting it increases output noise to 254µVRMS (vs. 32µVRMS with BP), but maintains full regulation, stability, and protection functionality-allowing design trade-offs between noise performance and solution size/cost.
What is the maximum continuous output current per channel for the MAX8559EBA11+?
The MAX8559EBA11+ delivers up to 300mA continuous output current per channel (OUTA and OUTB). This rating assumes use of a 4.7µF ceramic output capacitor and proper thermal management-especially critical in the UCSP package, which has a 379mW power dissipation limit at +70°C ambient.
Does the MAX8559EBA11+ require input or output capacitors for stability?
Yes, the MAX8559EBA11+ requires minimum 2.2µF ceramic input and output capacitors for stable operation up to 150mA per rail. For full 300mA capability across the -40°C to +85°C range, 4.7µF minimum capacitors are specified. X7R/X5R dielectrics are recommended; Z5U/Y5V types may require larger values for low-temperature stability.
How does shutdown work on the MAX8559EBA11+?
The MAX8559EBA11+ features two independent shutdown inputs: SHDNA controls OUTA, and SHDNB controls OUTB. Driving either pin low disables its respective LDO output and discharges it through a 385Ω internal resistor. Driving both low disables the entire device-including the internal reference-reducing total supply current to 0.01µA.
MAX8559EBA11+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFBGA, CSPBGA
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 1.85V, 1.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -, -
- Current - Output:
- 300mA, 300mA
- Current - Quiescent (Iq):
- 290 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB ~ 54dB (10kHz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UCSP (2.02x1.02)
MAX8559EBA11+ FAQ
1.How can I place an order for MAX8559EBA11+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8559EBA11+ 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 MAX8559EBA11+ reliable?
The price and inventory of MAX8559EBA11+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8559EBA11+ is usually 5 days.
3.What payment methods are accepted for MAX8559EBA11+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8559EBA11+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8559EBA11+?
MAX8559EBA11+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8559EBA11+ 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 MAX8559EBA11+?
For technical support, including MAX8559EBA11+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8559EBA11+ requirements.
6.How does Aetrix verify that MAX8559EBA11+ is sourced from the original manufacturer or authorized distributors?
All MAX8559EBA11+ 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 MAX8559EBA11+ meets industry standards.
7.What is the process for return or replacement of MAX8559EBA11+?
All MAX8559EBA11+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8559EBA11+, 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 MAX8559EBA11+ part is unused and in its original packaging.
Return procedure for MAX8559EBA11+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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