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Analog Devices Inc./Maxim Integrated MAX8815AETB+T
- Part No.:
- MAX8815AETB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX8815AETB+T.pdf
- Description:
- IC REG BST ADJ/3.3V 2.75A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,979
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Product details
Overview
The MAX8815AETB+T from Maxim Integrated is a synchronous step-up DC-DC converter optimized for battery-powered portable devices, delivering up to 1A at 5V from inputs as low as 1.2V, with 97% peak efficiency, 30µA quiescent current in idle mode, and True Shutdown™ enabling 0.1µA shutdown current. It supports both skip-mode (light-load efficiency) and forced-PWM (low-noise filtering) operation.
For engineers reviewing the MAX8815AETB+T datasheet, MAX8815AETB+T pinout, MAX8815AETB+T application, or MAX8815AETB+T equivalent, key selection considerations include its 2MHz fixed switching frequency, internal compensation, voltage positioning for transient response, 2.5A preset current limit, and compact 10-pin 3mm × 3mm TDFN-EP package with exposed thermal pad.
Technical Context
The MAX8815AETB+T employs current-mode PWM control with an internal 1.265V feedback reference and slope-compensation, enabling stable regulation across input voltages from 1.2V to 5.5V and output voltages from 3.3V to 5V. Its dual-mode operation-skip mode below ~90mA load and forced-PWM above-balances light-load efficiency and EMI control.
True Shutdown™ disconnects input from output via proprietary synchronous rectifier control, eliminating leakage paths without external switches. Voltage positioning provides ±1.5% load regulation (3% total span) with no transient droop, improving dynamic response over traditional high-gain loops in CPU-core and audio supply applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1A at 5V output from 2.5V input; enables single-cell Li+ or 2-cell NiMH core rail generation. |
| Switching Frequency | 2MHz fixed (FPWM mode); allows use of sub-2.2µH inductors and <22µF output capacitance for space-constrained designs. |
| Quiescent Current | 30µA typical in idle/skip mode; extends battery life in always-on portable systems with intermittent loads. |
| Shutdown Current | 0.1µA typical; eliminates standby drain in battery-backed systems requiring true power-off. |
| FB Regulation Voltage | 1.265V (typ), ±12mV over -40°C to +85°C; sets precise output via resistor divider for adjustable configurations. |
| Current Limit | Preset 2.5A (typ); supports robust startup into capacitive loads and short-circuit fault recovery within 16ms. |
| Efficiency | Up to 97% at 500mA/5V output from 3.6V input; minimizes thermal rise in sealed handheld enclosures. |
Pinout & Package
MAX8815AETB+T is housed in a thermally enhanced 10-pin, 3mm × 3mm TDFN-EP package with exposed paddle (EP) internally connected to GND. The EP must be soldered to a dedicated ground plane via a star-point connection for optimal thermal performance (θJA = 41°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - LX | Switch Node | Internally tied pins connecting to both n-channel switch and p-channel synchronous rectifier; requires low-inductance path to inductor. |
| 3 - BATT | Input Supply | Accepts 1.2V–5.5V battery input; bypassed to EP with ≥10µF ceramic capacitance for low-impedance source. |
| 4 - ON | Enable Control | Active-high logic input; drives low to enter True Shutdown™, reducing supply current to 0.1µA and isolating input/output. |
| 5 - GND | Analog Ground | Reference node for FB, ON, SKIPB; must be separated from PGND/EP return paths to avoid noise coupling. |
| 6 - FB | Feedback Input | Senses output voltage via resistor divider; regulates to 1.265V; high-impedance in shutdown to prevent loading. |
| 7 - OUTS | Bootstrap Supply | Connected to POUT through RC filter; powers internal gate drivers once output reaches ≥3V, enabling self-bootstrapping. |
| 8 - SKIPB | Mode Selection | Low = skip mode (variable frequency, high efficiency); high = FPWM mode (2MHz fixed, EMI-friendly). |
| 9, 10 - POUT | Power Output | Delivers regulated output; bypassed to EP with 22µF tantalum capacitor for stability and ripple suppression. |
| EP | Thermal Pad | Internally connected to GND; mandatory PCB connection to ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Proprietary synchronous rectifier control fully isolates input from output during shutdown, eliminating external blocking FETs and preventing battery drain. |
| Voltage Positioning | ±1.5% load regulation (3% total span) with zero transient droop, maintaining output within spec during rapid CPU load steps without oversized output caps. |
| Internal Compensation | Eliminates external compensation network, reducing BOM count and layout sensitivity while maintaining stability across 1µH–2.2µH inductors. |
| Soft-Start Control | Programmable duration (6ms typical) limits inrush current to <500mA at startup, protecting weak batteries and input filters. |
| Overload Protection | 16ms fault delay with auto-latch-off prevents thermal runaway during sustained short circuits or overload conditions. |
Applications
| Microprocessor Core Supply | Digital Still Camera (DSC) Power |
|---|---|
Use Scenario: Providing 5V/1A rail to ARM Cortex-M or DSP cores in handheld instruments with single-cell Li+ input. IC Role / Device Role / Timing Role: Primary step-up regulator generating stable core voltage with fast transient response and minimal dropout under burst loads. Use Value: Voltage positioning ensures ≤3% output deviation during 10mA→1A load steps, avoiding CPU brownouts without increasing output capacitance. |
Use Scenario: Powering CCD/CMOS image sensor bias and analog front-end in compact DSCs using 2-cell NiMH batteries. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering regulated 5V from 2.4V–3.0V battery range with low-noise FPWM mode during image capture. Use Value: 2MHz FPWM operation enables simple LC filtering to meet CISPR-22 Class B EMI limits without compromising efficiency. |
| Portable Audio Player Supply | PCMCIA Card Power Management |
Use Scenario: Generating clean 3.3V–5V rails for DACs, amplifiers, and flash memory in MP3 players powered by alkaline or Li+ cells. IC Role / Device Role / Timing Role: Dual-mode DC-DC converter operating in skip mode during playback pause (30µA IQ) and FPWM during active decode (low ripple). Use Value: 97% peak efficiency and ultra-low quiescent current extend alkaline battery life to >20 hours in mixed-use scenarios. |
Use Scenario: Providing isolated 5V/500mA power to PCMCIA Type II cards in industrial handheld terminals with limited board area. IC Role / Device Role / Timing Role: Compact boost IC enabling hot-swap power delivery with True Shutdown™ preventing backfeed into host controller during card removal. Use Value: 10-pin TDFN-EP package (3mm × 3mm) fits within tight PCMCIA card edge constraints while maintaining thermal headroom at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 2.2A current limit; 1.5MHz switching; no voltage positioning; requires external compensation. | Better suited for higher-current loads (>1A) but exhibits larger transient droop; less optimal for CPU core rails with fast load steps. | Choose TPS61088RHLR when peak current >1A is required and transient response is secondary to cost or availability. |
| LT3467EDD | Fixed 5V output only; 1.2MHz switching; 1.2A current limit; no FPWM mode; higher 100µA quiescent current. | Lacks adjustable output and forced-PWM mode; less flexible for multi-rail systems requiring 3.3V/5V options. | Choose LT3467EDD for simple fixed-5V applications where footprint and BOM simplicity outweigh efficiency and noise requirements. |
Compared with TPS61088RHLR and LT3467EDD, the MAX8815AETB+T uniquely combines voltage positioning for zero-droop transients, True Shutdown™ for true isolation, and dual-mode operation-making it the preferred choice for battery-sensitive, noise-critical portable systems demanding both efficiency and dynamic performance.
Availability
MAX8815AETB+T is available at Aetrix Electronics and suitable for portable audio players, digital still cameras, microprocessor core supplies, and PCMCIA card power management requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for MAX8815AETB+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and portable applications.
The MAX8815AETB+T belongs to Maxim's high-efficiency portable power management product line, designed specifically to extend battery life and simplify power design in space-constrained, noise-sensitive handheld electronics.
FAQ
What is the minimum input voltage required for the MAX8815AETB+T to start up?
The MAX8815AETB+T has a guaranteed minimum startup voltage of 1.2V and a typical value of 1.5V. Startup occurs when the input voltage exceeds this threshold and sufficient charge is available to bootstrap the OUTS rail via the POUT connection. Below 1.2V, the device remains unpowered and draws only leakage current.
How does the MAX8815AETB+T achieve True Shutdown™ without external components?
The MAX8815AETB+T uses a proprietary synchronous rectifier control architecture that actively disables both the n-channel switch and p-channel rectifier during shutdown, breaking the conduction path between BATT and POUT. This eliminates reverse current flow and allows the output to discharge to GND, achieving 0.1µA shutdown current without external MOSFETs or diodes.
Can the MAX8815AETB+T be configured for output voltages other than 5V?
Yes, the MAX8815AETB+T supports adjustable outputs from 3.3V to 5V using an external resistor divider connected between POUT and GND, with the FB pin tied to the divider midpoint. The internal 1.265V reference determines the ratio: R1 = R2 × (VOUT / 1.265 − 1). R2 should not exceed 500kΩ for accuracy and noise immunity.
What is the purpose of the OUTS pin on the MAX8815AETB+T?
The OUTS pin on the MAX8815AETB+T serves as the bootstrap supply for internal gate drivers. It connects to POUT through an RC filter and becomes active once the output reaches ≥3V, enabling self-powered operation of high-side drivers. This eliminates the need for external charge pumps and simplifies system-level power sequencing.
Does the MAX8815AETB+T require external compensation components?
No, the MAX8815AETB+T features fully internal compensation, eliminating the need for external capacitors or resistors in the feedback loop. This reduces bill-of-materials count, saves PCB area, and improves design robustness across recommended inductor values (1µH–2.2µH) and output capacitors (22µF tantalum).
MAX8815AETB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V (5V)
- Voltage - Output (Max):
- 5V
- Current - Output:
- 2.75A (Switch)
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
MAX8815AETB+T FAQ
1.How can I place an order for MAX8815AETB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8815AETB+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 MAX8815AETB+T reliable?
The price and inventory of MAX8815AETB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8815AETB+T is usually 5 days.
3.What payment methods are accepted for MAX8815AETB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8815AETB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8815AETB+T?
MAX8815AETB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8815AETB+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 MAX8815AETB+T?
For technical support, including MAX8815AETB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8815AETB+T requirements.
6.How does Aetrix verify that MAX8815AETB+T is sourced from the original manufacturer or authorized distributors?
All MAX8815AETB+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 MAX8815AETB+T meets industry standards.
7.What is the process for return or replacement of MAX8815AETB+T?
All MAX8815AETB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8815AETB+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 MAX8815AETB+T part is unused and in its original packaging.
Return procedure for MAX8815AETB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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