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Analog Devices Inc./Maxim Integrated MAX77827AEFD+T
- Part No.:
- MAX77827AEFD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 14-PowerUFQFN
- Datasheet:
-
MAX77827AEFD+T.pdf
- Description:
- IC REG BCK BST ADJ 1.6A 14FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,757
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Product details
Overview
MAX77827AEFD+T from Maxim Integrated is a high-efficiency, 2.5MHz buck-boost DC/DC converter in a 2.5mm × 2.5mm FC2QFN-14 package, supporting 1.8V–5.5V input and 2.3V–5.3V resistor-programmable output. It delivers up to 1.6A continuous output current with 3.1A peak switch current limit (A/D option), 96% peak efficiency at 3.3VIN/3.3VOUT, and 6μA typical quiescent current-optimized for Li-ion-powered wearables and LPWAN modules.
For engineers reviewing the MAX77827AEFD+T datasheet, MAX77827AEFD+T pinout, MAX77827AEFD+T application, or MAX77827AEFD+T equivalent, key selection criteria include its 3.1A ILIM capability (vs. 1.8A in B/D variants), FC2QFN thermal performance (θJA = 63.4°C/W), seamless buck-boost transition, and dual GPIO support for FPWM forcing and POK monitoring.
Technical Context
The MAX77827AEFD+T implements a four-switch H-bridge topology with fixed-frequency (2.25–2.75MHz) current-mode PWM control, enabling operation across VIN < VOUT (boost), VIN > VOUT (buck), and VIN ≈ VOUT (buck-boost boundary) without mode switching artifacts. Its unique control algorithm ensures fast line/load transient response (≤50mV line, ≤250mV load step) and stable regulation under dynamic battery voltage sag.
It integrates soft-start (200µs typ for A/C options), active output discharge (100Ω internal switch), UVLO (1.75V rising threshold), overcurrent protection (3ms latch-off, 12ms retry), and thermal shutdown (165°C). The SEL pin sets output voltage via external resistor; FPWM pin forces continuous PWM mode; POK provides open-drain power-good indication at 92.5%/90% VOUT thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full one-cell Li-ion discharge curve (4.2V → 2.8V) with no dropout or brownout. |
| Output Voltage Range | 2.3V to 5.3V - set by single external resistor on SEL pin; enables flexible rail generation for SoCs, RF transceivers, and sensors. |
| Switch Current Limit | 3.1A (typ) - enables higher output current in buck mode (up to 1.6A) and robust short-circuit handling per A/D variant spec. |
| Quiescent Current | 6μA (typ) - minimizes battery drain in always-on IoT sensor nodes during deep sleep states. |
| Peak Efficiency | 96% at 3.3VIN/3.3VOUT - reduces thermal stress and extends runtime in space-constrained portable devices. |
| Switching Frequency | 2.5MHz (nominal) - allows use of compact 1μH inductors and low-ESR ceramic capacitors for minimal solution size (14.52mm²). |
| UVLO Threshold | 1.75V (rising), 1.68V (falling) - prevents erratic startup during Li-ion cell recovery after deep discharge. |
Pinout & Package
MAX77827AEFD+T is packaged in a 2.5mm × 2.5mm, 0.55mm-pitch, 14-lead FC2QFN (package code F142A2F+1) with exposed thermal pad. This RoHS-compliant package offers θJA = 63.4°C/W on a 4-layer board, enabling reliable operation up to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 2) | Power Input | Bypassed to PGND with 10μF capacitor; accepts 1.8V–5.5V supply, including partially discharged Li-ion cells. |
| OUT (Pins 11,12) | Power Output | Main regulated output node; requires 22μF ceramic capacitor; supports 2.3V–5.3V programmable rail. |
| LX1 / LX2 (Pins 6,7 / 10) | Switching Nodes | Connect to opposite ends of single 1μH inductor; form H-bridge for buck/boost energy transfer. |
| PGND (Pin 14) | Power Ground | High-current return path for LX switches and IN/OUT capacitors; must be low-inductance plane. |
| AGND (Pin 3) | Analog Ground | Reference for feedback, SEL, FPWM, POK; isolated from PGND to minimize noise coupling. |
| EN (Pin 1) | Enable Input | Active-high logic control (1.3V threshold); initiates soft-start and H-bridge operation when asserted. |
| SEL (Pin 4) | Voltage Set Point | Analog input; resistance to AGND selects VOUT per Table 2 (e.g., open = 3.3V, 95.3kΩ = 3.1V). |
| FPWM (Pin 11) | Forced PWM Mode | Active-high digital input; disables SKIP mode to ensure constant frequency for EMI-sensitive applications. |
| POK (Pin 13) | Power-Good Indicator | Open-drain output; pulled high externally; asserts when VOUT ≥92.5% target, deasserts at ≤90%. |
| BIAS (Pin 5) | Bias Supply | Internal LDO output; bypassed to PGND with 1μF capacitor to stabilize internal reference and control circuitry. |
| OUTS (Pin 12) | Output Sense | Remote sensing point for feedback loop; improves regulation accuracy under PCB trace IR drop. |
| AGND (Pin 8) | Analog Ground | Second AGND connection; ties to same analog ground net as Pin 3 for improved noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Four-Switch H-Bridge Topology | Enables seamless buck-boost transition without discontinuity or audible noise-critical for battery-powered audio and sensor systems. |
| 3.1A Peak Switch Current Limit | Supports higher output current in buck mode (1.6A) and faster transient recovery vs. 1.8A variants-ideal for burst-mode wireless transmission. |
| 6μA Quiescent Current | Extends shelf life and operational time in ultra-low-power IoT endpoints where sleep current dominates total consumption. |
| 2.5MHz Fixed-Frequency PWM | Permits miniaturized passive components (1μH inductor, 22μF output cap), reducing solution footprint to 14.52mm². |
| Integrated Active Output Discharge | 100Ω internal switch discharges VOUT rapidly upon disable-prevents back-powering of downstream circuits and meets safety requirements. |
| Programmable UVLO with Hysteresis | 1.75V rising / 1.68V falling thresholds prevent oscillation near battery cutoff, ensuring clean system reset during low-VIN recovery. |
Applications
| Smart Wearables | LPWAN Modems (NB-IoT/LTE-M) |
|---|---|
Use Scenario: Compact fitness tracker with BLE radio, optical heart-rate sensor, and rechargeable Li-ion cell. IC Role / Device Role / Timing Role: Primary system power rail generator, regulating 3.3V from 4.2V–2.8V battery. Use Value: 6μA IQ extends 7-day battery life in sleep mode; 96% efficiency preserves runtime during 30-second BLE bursts. | Use Scenario: Cellular IoT node transmitting small telemetry packets every 10 minutes using NB-IoT. IC Role / Device Role / Timing Role: Main 3.3V supply for modem IC, MCU, and RF front-end. Use Value: 3.1A ILIM handles 1.2A transmit peak current; 2.5MHz switching avoids interference with cellular bands. |
| Always-On Sensor Hubs | Portable Medical Monitors |
Use Scenario: Environmental sensor node (temp/humidity/pressure) operating continuously on coin cell or small Li-ion. IC Role / Device Role / Timing Role: Single-rail buck-boost regulator powering ultra-low-power MCU and analog sensors. Use Value: SKIP mode maintains >85% efficiency at 100μA load; POK signal validates rail stability before sensor readout. | Use Scenario: Handheld ECG monitor requiring clinical-grade accuracy and 24-hour runtime on single Li-ion cell. IC Role / Device Role / Timing Role: Precision 3.0V analog supply for ADC and op-amps, isolated from noisy digital rails. Use Value: OUTS pin enables remote sensing for ±0.5% output regulation; low-noise FPWM mode reduces ADC quantization error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77827CEFD+T | Same FC2QFN-14 package and 3.1A ILIM, but C-grade (-40°C to +85°C) vs. A-grade (-40°C to +125°C) operating range. | Suitable for consumer-grade wearables; not rated for extended industrial or automotive ambient temperatures. | Select MAX77827AEFD+T for designs requiring full -40°C to +125°C junction operation, such as vehicle-mounted telematics or outdoor IoT gateways. |
| TPS63802DLAR | 2.5V–5.5V input, 1.8V–5.5V output, 2A max output, 1.2MHz switching, 11μA IQ - lower efficiency (94% peak), larger solution size. | Compatible for cost-sensitive, non-thermally constrained applications; lacks POK and FPWM pins. | Choose TPS63802DLAR only if 125°C operation and 6μA IQ are not required, and board area is less critical than BOM cost. |
Compared with MAX77827CEFD+T, the MAX77827AEFD+T adds guaranteed 125°C junction operation and tighter thermal shutdown hysteresis; versus TPS63802DLAR, it delivers 2% higher peak efficiency, 45% lower quiescent current, and integrated POK/FPWM functionality in identical footprint.
Availability
MAX77827AEFD+T is available at Aetrix Electronics and suitable for smart wearables, LPWAN modems, always-on sensor hubs, and portable medical monitors requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX77827AEFD+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 communications applications.
The MAX77827 product line targets ultra-low-power, high-efficiency buck-boost conversion in space-constrained battery-powered systems-specifically engineered to replace multiple discrete regulators with a single, thermally optimized IC for Li-ion and multi-cell alkaline platforms.
FAQ
What is the maximum continuous output current supported by the MAX77827AEFD+T?
The MAX77827AEFD+T supports up to 1.6A continuous output current in buck mode when configured with its 3.1A peak switch current limit (ILIM). This rating assumes proper thermal design (θJA = 63.4°C/W), 2.5MHz operation, and standard PCB layout with adequate copper pour on the exposed thermal pad. Derating applies above +70°C ambient.
How does the MAX77827AEFD+T differ from the MAX77827BEFD+T in terms of current capability?
The MAX77827AEFD+T features a 3.1A (typ) peak switch current limit, while the MAX77827BEFD+T is rated for 1.8A (typ). This difference is defined by factory programming and reflected in Table 1 of the datasheet. The higher ILIM enables greater output current in buck mode and improved transient response for pulsed loads like cellular transmission bursts.
Can the MAX77827AEFD+T operate with a 1.5V input voltage?
No. The MAX77827AEFD+T has a minimum input voltage of 1.8V (per Absolute Maximum Ratings and Electrical Characteristics tables). Operation below 1.8V violates specification and may result in UVLO activation or unstable regulation. For sub-1.8V inputs, consider alternative architectures such as boost-only or specialized ultra-low-VIN regulators.
What is the purpose of the OUTS pin on the MAX77827AEFD+T?
OUTS is the output voltage sense pin on the MAX77827AEFD+T. It connects directly to the load-side of the output capacitor to enable remote sensing, compensating for IR drop across PCB traces and improving output voltage regulation accuracy-especially critical in high-current or long-trace applications like modular sensor systems.
Does the MAX77827AEFD+T require an external resistor to set the output voltage?
Yes. The MAX77827AEFD+T uses the SEL pin with an external resistor to ground (AGND) to program the output voltage from 2.3V to 5.3V. Resistor values are specified in Table 2 of the datasheet (e.g., 95.3kΩ yields 3.1V; open circuit yields 3.3V). A 1% tolerance resistor is recommended for ±1% output accuracy.
MAX77827AEFD+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-PowerUFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.3V
- Voltage - Output (Max):
- 5.3V
- Current - Output:
- 1.6A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-FC2QFN (2.5x2.5)
MAX77827AEFD+T FAQ
1.How can I place an order for MAX77827AEFD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77827AEFD+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 MAX77827AEFD+T reliable?
The price and inventory of MAX77827AEFD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77827AEFD+T is usually 5 days.
3.What payment methods are accepted for MAX77827AEFD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77827AEFD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77827AEFD+T?
MAX77827AEFD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77827AEFD+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 MAX77827AEFD+T?
For technical support, including MAX77827AEFD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77827AEFD+T requirements.
6.How does Aetrix verify that MAX77827AEFD+T is sourced from the original manufacturer or authorized distributors?
All MAX77827AEFD+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 MAX77827AEFD+T meets industry standards.
7.What is the process for return or replacement of MAX77827AEFD+T?
All MAX77827AEFD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77827AEFD+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 MAX77827AEFD+T part is unused and in its original packaging.
Return procedure for MAX77827AEFD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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