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Analog Devices Inc./Maxim Integrated MAX77827BEFD+
- Part No.:
- MAX77827BEFD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 14-PowerUFQFN
- Datasheet:
-
MAX77827BEFD+.pdf
- Description:
- IC REG BUCK BOOST ADJ 14FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,898
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Product details
Overview
MAX77827BEFD+ from Maxim Integrated is a high-efficiency, ultra-low-quiescent-current buck-boost DC/DC converter for single-cell Li-ion battery systems. It delivers 2.3V–5.3V adjustable output with 1.8A switching current limit, 6μA typical IQ, and 96% peak efficiency at 3.3V in/out - enabling extended runtime in wearables and LPWAN endpoints.
For engineers reviewing the MAX77827BEFD+ datasheet, MAX77827BEFD+ pinout, MAX77827BEFD+ application, or MAX77827BEFD+ equivalent, key selection factors include its 1.8A ILIM option (B/D variants), FC2QFN-14 package, seamless buck-boost transition, and dual GPIO support for FPWM forcing and POK monitoring in space-constrained portable designs.
Technical Context
The MAX77827BEFD+ implements a four-switch H-bridge topology with fixed 2.5MHz PWM control and current-mode compensation, enabling continuous regulation across VIN < VOUT (boost), VIN ≈ VOUT (buck-boost boundary), and VIN > VOUT (buck) modes. Its unique algorithm ensures fast line/load transient response (≤50mV line, ≤250mV load step) without external compensation.
It features integrated soft-start (1.5ms typ), active output discharge (100Ω internal switch), and comprehensive protection including UVLO (1.62–1.80V rising threshold), overcurrent (cycle-by-cycle 1.8A limit), and thermal shutdown (165°C). The SEL pin sets output voltage via a single resistor; FPWM and POK pins provide system-level control and status signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full discharge curve of 1-cell Li-ion (2.8V–4.4V) plus USB/charger input without external LDO. |
| Output Voltage Range | 2.3V to 5.3V, resistor-programmable via SEL pin - enables direct supply to 3.3V microcontrollers or 5V peripherals from varying battery states. |
| Switching Current Limit | 1.8A (typ) - defines maximum inductor current during transients; determines max 900mA boost output at 3.0VIN/3.3VOUT per datasheet Table 1. |
| Quiescent Current | 6μA typical - minimizes standby power loss in always-on IoT sensors, extending battery life beyond 1 year in low-duty-cycle applications. |
| Peak Efficiency | 96% at 3.3VIN/3.3VOUT - reduces thermal stress and enables compact 14-pin FC2QFN (2.5mm × 2.5mm) layout in thermally constrained wearables. |
| Switching Frequency | 2.5MHz nominal - allows use of small 1μH inductors and 22μF output capacitors, achieving <14.5mm² total solution size. |
| UVLO Threshold | 1.75V rising (typ) - prevents erratic operation during deep battery discharge while allowing recovery when charge resumes. |
Pinout & Package
The MAX77827BEFD+ is packaged in a 2.5mm × 2.5mm, 14-lead FC2QFN (package code F142A2F+1) with exposed thermal pad. This RoHS-compliant package provides θJA = 63.4°C/W on a four-layer board and supports reflow soldering up to +260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 2) | Power input | Accepts 1.8–5.5V; requires 10μF ceramic bypass to PGND for stability and EMI suppression. |
| OUT (Pins 11,12) | Regulated output | Delivers 2.3–5.3V; connects to 22μF output capacitor and system rail; OUTS (Pin 13) enables remote sensing. |
| LX1/LX2 (Pins 6,7 / 10) | Switching nodes | Drive external 1μH inductor; require tight layout with minimal trace inductance to reduce switching losses and EMI. |
| PGND (Pin 14) | Power ground | High-current return path for LX switches; must be connected to IN/OUT capacitor grounds with low-inductance copper pour. |
| AGND (Pin 3) | Analog ground | Reference for feedback and bias circuits; isolated from PGND except at single-point star ground to avoid noise coupling. |
| EN (Pin 1) | Enable control | Active-high digital input; pulls up internally; asserts soft-start sequence upon rising edge with 100μs turn-on delay. |
| FPWM (Pin 8) | Forced PWM mode | Logic-high forces continuous PWM operation regardless of load, reducing output ripple for noise-sensitive analog subsystems. |
| POK (Pin 9) | Power-OK indicator | Open-drain output asserting high when VOUT ≥92.5% of target; requires external pull-up for system power sequencing. |
| SEL (Pin 4) | Output voltage select | Analog input reading external RSEL resistor value; sets VOUT per Table 2 (e.g., open = 3.3V, 95.3kΩ = 3.1V). |
| BIAS (Pin 5) | Bias supply | Internal LDO output; bypassed with 1μF capacitor to PGND to stabilize internal reference and gate drivers. |
| OUTS (Pin 13) | Output sense | Connects to load-side of output capacitor for accurate remote voltage regulation, compensating for PCB IR drop. |
| AGND (Pin 3) | Analog ground | Reference for feedback and bias circuits; isolated from PGND except at single-point star ground to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch H-bridge topology | Enables seamless buck/boost/buck-boost transitions without mode-hopping artifacts or output glitches during battery voltage sag. |
| 1.8A programmable current limit | Optimizes external component sizing for 900mA boost output at 3.0V input, balancing efficiency, thermal performance, and cost in wearable form factors. |
| SKIP mode with 6μA IQ | Extends battery life in sensor sleep states by reducing switching activity while maintaining regulation, critical for multi-year LPWAN deployments. |
| Integrated active output discharge | 100Ω internal switch discharges VOUT within milliseconds after disable, preventing back-powering of upstream circuitry and ensuring safe power-down sequencing. |
| 2.5MHz fixed-frequency PWM | Permits use of miniature 1μH shielded inductors and low-ESR ceramic capacitors, minimizing footprint and height in ultra-thin mobile devices. |
Applications
| Smart Wearables | LPWAN Endpoints (NB-IoT/Cat-M1) |
|---|---|
Use Scenario: Compact fitness tracker powered by 1-cell Li-ion with dynamic load (BLE radio burst, OLED display, accelerometer). IC Role / Device Role / Timing Role: Primary system power rail regulator maintaining stable 3.3V under rapid 10mA–500mA load steps and wide input range (4.2V→2.8V). Use Value: 96% efficiency and 6μA IQ extend battery life to >7 days between charges; 2.5MHz switching enables <15mm² solution size fitting wristband constraints. | Use Scenario: Cellular IoT sensor node transmitting periodic telemetry over NB-IoT, operating intermittently on coin cell or small Li-ion. IC Role / Device Role / Timing Role: Buck-boost regulator supplying 3.3V to modem and MCU during transmit bursts, sustaining regulation down to 2.6V input. Use Value: 1.8A current limit handles 400mA modem peak loads; UVLO at 1.75V prevents brownouts during deep discharge; POK confirms rail readiness before transmission. |
| Smartphone Peripherals | Portable Medical Sensors |
Use Scenario: USB-C powered Bluetooth earbud case with integrated charging and status LEDs. IC Role / Device Role / Timing Role: Dual-role regulator accepting 5V USB input or boosting from internal 3.7V battery to 5V for LED drivers and charging IC. Use Value: Seamless buck-boost transition avoids audio dropout during source switching; FPWM pin enables low-noise 5V rail for sensitive DACs during playback. | Use Scenario: Disposable glucose monitor using CR2032 coin cell, requiring precise 2.5V analog front-end supply. IC Role / Device Role / Timing Role: Adjustable-output buck-boost generating stable 2.5V from 3.0V–2.0V battery, with SEL resistor set to 634kΩ per Table 2. Use Value: Resistor-programmed accuracy (±1% typ) ensures ADC reference stability; active discharge clears residual voltage post-measurement for low-power sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | 3.5A switch current limit, 2.5V–5.5V input, fixed 3.3V/5V outputs only - no resistor-adjustable VOUT. | Higher current capability suits 1A+ loads but lacks fine-grained voltage tuning needed for mixed-voltage SoCs. | Select when higher output current (>900mA boost) is required and fixed output rails suffice. |
| RTQ2132BGQW | 2.5A ILIM, 2.5V–5.5V input, 2.5V–5.5V adjustable output via I²C - no resistor-based programming. | Digital interface enables dynamic voltage scaling but adds firmware complexity and I²C routing overhead. | Select when system requires runtime VOUT adjustment (e.g., adaptive power management) and I²C resources are available. |
Compared with TPS63020DSJR and RTQ2132BGQW, the MAX77827BEFD+ offers superior light-load efficiency (6μA IQ vs. ~20μA), smaller FC2QFN footprint (2.5mm² vs. 3.0mm²), and simpler resistor-based VOUT configuration - making it optimal for cost-sensitive, space-constrained, battery-limited wearables and sensors.
Availability
MAX77827BEFD+ is available at Aetrix Electronics and suitable for smart wearables, LPWAN endpoints, and portable medical sensors requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for MAX77827BEFD+ 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 consumer applications.
The MAX77827 product line targets ultra-low-power, single-cell battery-powered systems - delivering high-efficiency buck-boost conversion with minimal quiescent current and compact packaging for next-generation wearables and IoT edge devices.
FAQ
What is the switching current limit specification for MAX77827BEFD+?
The MAX77827BEFD+ has a typical switching current limit of 1.8A, as confirmed in Table 1 of the datasheet for B/D option parts. This limit applies across the full operating temperature range (-40°C to +125°C) and defines the peak inductor current during transient events. It enables up to 900mA output in boost mode at 3.0V input and 3.3V output, directly supporting common low-power wireless modules.
How is the output voltage programmed on MAX77827BEFD+?
The MAX77827BEFD+ uses a single external resistor (RSEL) connected between the SEL pin and AGND to program the output voltage from 2.3V to 5.3V. Table 2 in the datasheet specifies exact resistor values - for example, an open circuit yields 3.3V, while a 95.3kΩ resistor sets 3.1V. The IC reads RSEL during startup and maintains that setting throughout operation without requiring digital interface or trimming.
Does MAX77827BEFD+ support forced PWM mode, and how is it enabled?
Yes, MAX77827BEFD+ supports forced PWM (FPWM) mode to eliminate frequency variation and minimize output ripple. It is enabled by driving the FPWM pin (Pin 8) logic-high; the internal pulldown resistor (400–1600kΩ) ensures default SKIP mode when left unconnected. FPWM mode is especially valuable for powering noise-sensitive analog circuits like ADCs or RF receivers where consistent switching frequency improves filtering.
What protection features are integrated into MAX77827BEFD+?
MAX77827BEFD+ integrates UVLO (1.75V rising threshold), cycle-by-cycle overcurrent protection (1.8A limit), thermal shutdown (165°C), soft-start (1.5ms typical), and active output discharge (100Ω internal switch). These features operate autonomously without external components, safeguarding both the IC and system during fault conditions such as short circuits, overheating, or input brownout - critical for unattended IoT deployments.
What package type and dimensions does MAX77827BEFD+ use?
MAX77827BEFD+ uses the 14-lead FC2QFN package (outline number 21-100382, package code F142A2F+1), measuring 2.5mm × 2.5mm × 0.55mm with an exposed thermal pad. This RoHS-compliant package achieves θJA = 63.4°C/W on a four-layer board and supports standard reflow profiles, making it suitable for high-density portable PCB assemblies where thermal performance and miniaturization are essential.
MAX77827BEFD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-PowerUFQFN
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.3V
- Voltage - Output (Max):
- 5.3V
- Current - Output:
- 900mA
- 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)
MAX77827BEFD+ FAQ
1.How can I place an order for MAX77827BEFD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77827BEFD+ 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 MAX77827BEFD+ reliable?
The price and inventory of MAX77827BEFD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77827BEFD+ is usually 5 days.
3.What payment methods are accepted for MAX77827BEFD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77827BEFD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77827BEFD+?
MAX77827BEFD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77827BEFD+ 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 MAX77827BEFD+?
For technical support, including MAX77827BEFD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77827BEFD+ requirements.
6.How does Aetrix verify that MAX77827BEFD+ is sourced from the original manufacturer or authorized distributors?
All MAX77827BEFD+ 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 MAX77827BEFD+ meets industry standards.
7.What is the process for return or replacement of MAX77827BEFD+?
All MAX77827BEFD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77827BEFD+, 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 MAX77827BEFD+ part is unused and in its original packaging.
Return procedure for MAX77827BEFD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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