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Analog Devices Inc./Maxim Integrated MAX17271ETE+
- Part No.:
- MAX17271ETE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17271ETE+.pdf
- Description:
- IC REG BUCK BST ADJ TRPL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,220
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Product details
Overview
MAX17271ETE+ from Maxim Integrated is a nanoPower triple-output SIMO (Single-Inductor Multiple-Output) buck-boost DC-DC regulator designed for ultra-low-power wearable systems. It delivers three independently programmable outputs (0.8V–5.175V), operates from 2.7V–5.5V input, achieves up to 85% efficiency at 3.3V output, and draws only 1.3µA quiescent current with all outputs enabled - enabling extended battery life in compact IoT and health-monitoring devices.
For engineers reviewing the MAX17271ETE+ datasheet, MAX17271ETE+ pinout, MAX17271ETE+ application, or MAX17271ETE+ equivalent, this page provides verified technical context, I²C-configurable voltage/peak-current settings, WLP/TQFN package details, real-world load transient behavior, and validated alternative options for space-constrained, multi-rail wearable power designs.
Technical Context
The MAX17271ETE+ implements a proprietary time-interleaved SIMO control scheme that dynamically allocates switching cycles among three outputs using a single 2.2µH inductor - enabling buck, boost, and pass-through operation across the full input range. Its I²C interface (SCL/SDA/VIO) supports register-based configuration of output voltages (via TVSIMOx[7:0]), peak current limits (ILIM[1:0]), active discharge (ADE), and power sequencing (ENCTL[4:0]).
It integrates dedicated low-side/high-side synchronous rectifiers per channel (M3_1/M3_2/M3_3 + M2), soft-start (1.2mV/µs dVOUT/dtSS), overtemperature protection (165°C trip), and ultra-low-power mode (ULPM) that biases outputs +2.5% under light loads to suppress undershoot during sudden load steps - confirmed in typical operating waveforms (toc07–toc15).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | SIMO buck-boost - single inductor regulates 3 independent outputs above/below/equal to input voltage |
| Input Voltage Range | 2.7V to 5.5V - supports full Li-ion/Li-poly battery discharge curve without rail collapse |
| Output Voltage Range | 0.8V to 5.175V - programmable via I²C registers (TVSIMOx[7:0]) with 25mV step resolution |
| Quiescent Current | 1.3µA (all 3 outputs enabled) - enables >1-year battery life in always-on hearables and fitness bands |
| Peak Inductor Current Limit | Configurable per output: 0.4A, 0.6A, 0.8A, or 1.1A (ILIM[1:0] bits) - balances EMI, ripple, and load capability |
| I²C Interface | Standard/Fast/Fast-mode Plus (0–1000kHz) - supports dynamic reconfiguration and fault reporting via IRQB interrupt |
| Operating Temperature | −40°C to +85°C - qualified for body-worn and ambient-exposed wearable applications |
Pinout & Package
MAX17271ETE+ is available in a 16-pin TQFN package (3mm × 3mm × 0.75mm, package code T1633+5) and a 16-bump WLP (1.77mm × 1.77mm × 0.50mm, package code N161A1+1). This entry covers the TQFN variant (ETE+ suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Main regulated output 1 - requires ≥10µF ceramic capacitor to GND; voltage set via I²C TVSIMO1[7:0] |
| 2 | OUT2 | Main regulated output 2 - independent voltage/current limit programming; same capacitor requirement as OUT1 |
| 3 | OUT3 | Main regulated output 3 - supports highest 5.175V output; critical for RF or sensor bias rails |
| 4 | GND | Analog ground reference - must connect to low-impedance PCB ground plane |
| 5 | PGND | Power ground - separate low-impedance return path for high-current LX switching nodes |
| 6 | LXB | Output-side inductor connection - ties to 2.2µH inductor and BST capacitor (100nF) |
| 7 | RSTB | Open-drain power-good indicator - pulled high externally; asserts logic-high only when all outputs are stable |
| 8 | SDA | I²C data line - bidirectional, 10pF pin capacitance; requires external pull-up to VIO rail |
| 9 | LXA | Input-side inductor connection - connects to same 2.2µH inductor as LXB; carries full input current |
| 10 | BST | Bootstrap supply for high-side FET drivers - requires 100nF capacitor to LXB for gate drive |
| 11 | VIO | I²C interface supply - sets SDA/SCL threshold (0.3×/0.7×VIO); must be ≤ VSUP and ≥1.7V |
| 12 | VPWR | Main input power - accepts 2.7V–5.5V; requires ≥10µF bulk capacitor to PGND |
| 13 | VSUP | Analog supply - tied internally to VPWR; decoupling not required if VPWR is well-filtered |
| 14 | VIO | Second VIO pin - redundant connection for noise immunity; must match pin 11 voltage |
| 15 | SCL | I²C clock input - edge-triggered; supports 1000kHz max frequency with 50ns spike suppression |
| 16 | IRQB | Open-drain interrupt output - signals faults (OVLO, UVLO, thermal shutdown) or status changes |
Key Features
| Feature | Design Value |
|---|---|
| I²C-configurable outputs | Three independent voltage targets (0.8–5.175V) and peak current limits (0.4–1.1A) programmed via TVSIMOx/ILIM registers |
| Ultra-low-power mode (ULPM) | Automatic transition under light loads; outputs biased +2.5% to minimize undershoot during 10mA→55mA transients (toc13–toc15) |
| Integrated active discharge | 100Ω per-channel resistors (RAD_SBBx) - configurable via ADE bit to ensure rapid output discharge on disable |
| Robust protection suite | Input UVLO (2.55V rise)/OVLO (5.7V rise), thermal shutdown (165°C), and soft-start (1.2mV/µs slew rate) prevent inrush and fault propagation |
| Small solution footprint | Single 2.2µH inductor + 3×10µF output caps replaces 3 buck + linear regulators - reduces BOM count and board area by >40% |
Applications
| Bluetooth Headsets | Fitness Bands |
|---|---|
Use Scenario: Dual-rail audio codec (1.8V) and Bluetooth radio (3.3V) powered from single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: SIMO buck-boost regulator providing isolated, dynamically configurable outputs with <50mV load regulation (toc05/toc06). Use Value: Eliminates need for discrete LDOs; maintains 3.3V rail stability during 55mA Bluetooth transmit bursts without undershoot. |
Use Scenario: Simultaneous powering of MCU core (1.2V), optical heart-rate sensor (3.3V), and BLE SoC (1.8V) in sub-20mm² wristband PCB. IC Role / Device Role / Timing Role: NanoPower triple-output regulator enabling <1.3µA system sleep current and fast wake-up (<2ms startup, toc17). Use Value: Extends battery life to 14+ days; ULPM mode prevents voltage droop during motion-sensor sampling spikes. |
| Smart Watches | Hearables |
Use Scenario: Powering display driver (3.3V), touch controller (1.8V), and PMIC sequencer (1.2V) from shared coin-cell or thin-film battery. IC Role / Device Role / Timing Role: Single-inductor multi-output regulator with I²C-controlled sequencing (ENCTL[4:0]) and RSTB power-good handshake. Use Value: Enables precise power-up order (e.g., 1.2V → 1.8V → 3.3V) and eliminates external reset supervisors. |
Use Scenario: Compact true-wireless earbud charging case with integrated battery gauge and dual-channel audio amplification. IC Role / Device Role / Timing Role: SIMO regulator delivering 1.2V for DSP core and 3.3V for Class-D amplifier with <100mVpp ripple (toc08/toc09). Use Value: Reduces solution size by 35% vs. discrete buck + LDO; IRQB interrupt alerts host MCU of input UVLO during low-battery charging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output SIMO buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17270ETE+ | No I²C interface; uses resistor-programmed outputs (RSEL1–RSEL3) and discrete enable inputs (EN1–EN3) | Suitable for fixed-voltage, cost-sensitive wearables without runtime reconfiguration needs | Select MAX17270ETE+ when firmware control is unnecessary and BOM simplicity is prioritized |
| TI TPS65276PWP | Dual-output buck + single LDO architecture; no SIMO topology; higher quiescent current (12µA) | Requires external inductors per buck channel; larger solution size; lacks ULPM and I²C configurability | Choose TPS65276PWP only if legacy design reuse or non-SIMO topology constraints apply |
Compared with MAX17270ETE+, the MAX17271ETE+ adds I²C configurability and push-button control but shares identical SIMO efficiency, package, and thermal performance; versus TPS65276PWP, it delivers 90% lower quiescent current and 40% smaller total solution size at the cost of higher integration complexity.
Availability
MAX17271ETE+ is available at Aetrix Electronics and suitable for Bluetooth headsets, fitness bands, and smart watches requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17271ETE+ 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, medical, and consumer applications.
The MAX17270/MAX17271 product line targets ultra-low-power wearable electronics, delivering multi-rail regulation from single-cell batteries with minimal board area and nanoscale quiescent current.
FAQ
What is the primary function of the MAX17271ETE+ in a wearable power system?
The MAX17271ETE+ serves as a nanoPower triple-output SIMO buck-boost regulator that replaces multiple discrete DC-DC converters and LDOs. It generates three independent, I²C-programmable output voltages (0.8V–5.175V) from a single 2.7V–5.5V input using one 2.2µH inductor - reducing solution size by >40% while maintaining 85% efficiency and 1.3µA quiescent current in wearable devices like fitness bands and hearables.
How does the MAX17271ETE+ achieve ultra-low quiescent current?
The MAX17271ETE+ achieves 1.3µA quiescent current (with all outputs enabled) through a combination of deep-sleep state machine control, adaptive ultra-low-power mode (ULPM) activation under light loads, and optimized gate-drive circuitry. Its proprietary SIMO controller enters a low-power rest state when no output requires service, and ULPM further reduces switching frequency while biasing outputs +2.5% to handle transients without additional current draw - confirmed in typical operating characteristics (toc02/toc03).
Can the MAX17271ETE+ regulate output voltages both above and below the input voltage?
Yes, the MAX17271ETE+ uses a buck-boost SIMO architecture that inherently supports output voltages both above and below the input voltage. For example, with a 3.7V battery input, it can simultaneously deliver 1.2V (buck), 3.3V (near-pass-through), and 5.175V (boost) - all from the same inductor and control block. This capability is explicitly stated in the General Description and validated in the Functional Diagram and SIMO Control Scheme sections of the datasheet.
What protection features are built into the MAX17271ETE+?
The MAX17271ETE+ integrates input UVLO (2.55V rising threshold), OVLO (5.7V rising threshold), thermal shutdown (165°C junction trip), soft-start (1.2mV/µs slew rate), and overload protection. These functions are hardware-implemented and do not require firmware intervention. The device also includes internal clamping diodes on LXA/LXB pins and reverse-blocking MOSFETs (M1–M4) to prevent backfeed - all detailed in Absolute Maximum Ratings and Detailed Description sections.
Is the MAX17271ETE+ pin-compatible with the MAX17270ETE+?
No, the MAX17271ETE+ and MAX17270ETE+ are not pin-compatible. While both share the same 16-pin TQFN package outline, their pin functions differ significantly: MAX17271ETE+ replaces EN1/EN2/EN3/RSEL1–RSEL3 with SCL/SDA/VIO/IRQB/RSTB/ON, enabling I²C control and push-button functionality. The MAX17270ETE+ uses resistor-based configuration and discrete enables. PCB layout must be redesigned when substituting between these variants.
MAX17271ETE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.175V
- Current - Output:
- 1.2A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (3x3)
MAX17271ETE+ FAQ
1.How can I place an order for MAX17271ETE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17271ETE+ 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 MAX17271ETE+ reliable?
The price and inventory of MAX17271ETE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17271ETE+ is usually 5 days.
3.What payment methods are accepted for MAX17271ETE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17271ETE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17271ETE+?
MAX17271ETE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17271ETE+ 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 MAX17271ETE+?
For technical support, including MAX17271ETE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17271ETE+ requirements.
6.How does Aetrix verify that MAX17271ETE+ is sourced from the original manufacturer or authorized distributors?
All MAX17271ETE+ 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 MAX17271ETE+ meets industry standards.
7.What is the process for return or replacement of MAX17271ETE+?
All MAX17271ETE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17271ETE+, 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 MAX17271ETE+ part is unused and in its original packaging.
Return procedure for MAX17271ETE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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