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Analog Devices Inc./Maxim Integrated MAX77827CEFD+
- Part No.:
- MAX77827CEFD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 14-PowerUFQFN
- Datasheet:
-
MAX77827CEFD+.pdf
- Description:
- IC REG BCK BST ADJ 1.6A 14FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:463
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Product details
Overview
MAX77827CEFD+ from Maxim Integrated is a high-efficiency, ultra-low-quiescent-current buck-boost DC/DC converter optimized for single-cell Li-ion battery systems. It delivers 2.3V–5.3V adjustable output with 3.1A switching current limit (buck mode), 96% peak efficiency at 3.3VIN/3.3VOUT, and 6μA typical IQ. It operates across 1.8V–5.5V input and supports seamless buck/boost transition in compact 2.5mm × 2.5mm FC2QFN packaging - ideal for space-constrained wearables and LPWAN endpoints.
For engineers reviewing the MAX77827CEFD+ datasheet, MAX77827CEFD+ pinout, MAX77827CEFD+ application, or MAX77827CEFD+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (FPWM/SKIP), real-world transient response data, and two rigorously cross-checked alternative parts - all tied explicitly to the CEFD+ variant per Maxim's ordering matrix and Electrical Characteristics table.
Technical Context
The MAX77827CEFD+ implements a four-switch H-bridge buck-boost topology with fixed 2.5MHz PWM control and current-mode compensation. Its dual ILIM configuration (3.1A buck / 1.8A boost) is hard-coded per part number - CEFD+ uses the 3.1A ILIM option, enabling up to 1.6A output in buck mode at VIN = 3.0V, VOUT = 3.3V.
It features dedicated analog pins (SEL for resistor-programmed VOUT, BIAS for internal LDO reference), dual ground domains (AGND/PGND), and digital I/O (EN, FPWM, open-drain POK). Protection includes cycle-by-cycle OCP, thermal shutdown at +165°C, UVLO with asymmetric thresholds (1.75V rise / 1.68V fall), and active output discharge via 100Ω internal switch.
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–4.2V) plus USB/charger headroom. |
| Output Voltage Range | 2.3V to 5.3V - set by single external resistor on SEL pin; enables direct replacement of multiple fixed-output regulators. |
| Switching Current Limit | 3.1A (typ) - enables ≥1.6A continuous buck-mode output at 3.3V, critical for powering RF transceivers in NB-IoT modules. |
| Quiescent Current | 6μA (typ) - minimizes battery drain during sleep states in always-on IoT sensors. |
| Peak Efficiency | 96% at 3.3VIN/3.3VOUT - reduces thermal load in sealed wearable enclosures. |
| Switching Frequency | 2.5MHz (nominal) - allows use of small 1μH inductors and <10mm² total solution size. |
| UVLO Threshold | Rising: 1.75V, Falling: 1.68V - prevents erratic startup during Li-ion brownout below 3.0V cell voltage. |
Pinout & Package
MAX77827CEFD+ is packaged in a 2.5mm × 2.5mm, 14-lead FC2QFN (Package Code F142A2F+1) with exposed thermal pad. Pin pitch is 0.55mm; land pattern follows Maxim Application Note 90-100127.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SEL, POK | SEL sets VOUT via resistor divider; POK is open-drain power-good indicator requiring external pull-up. |
| 3, 4 | EN, PGND | EN enables regulator (logic-high active); PGND carries high-current return path for LX1/LX2 switches. |
| 5, 6, 7 | LX1, IN, BIAS | LX1 is high-side switch node; IN supplies main power rail; BIAS powers internal bias circuitry (bypass with 1μF). |
| 8, 9, 10 | AGND, LX2, OUT | AGND isolates analog reference; LX2 is second switch node; OUT delivers regulated output (bypass with 22μF). |
| 11, 12, 13, 14 | OUTS, FPWM, AGND, FPWM | OUTS provides remote output sensing; FPWM forces PWM mode (low ripple); duplicate AGND and FPWM pins ensure low-impedance grounding and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transition | H-bridge topology maintains regulation without dropout when VIN crosses VOUT - essential for stable power during Li-ion discharge from 4.2V to 2.8V. |
| Configurable Operating Mode | SKIP mode maximizes light-load efficiency; FPWM pin forces fixed-frequency operation for lowest output ripple in noise-sensitive RF sections. |
| Integrated Active Discharge | 100Ω internal switch discharges output capacitor within milliseconds after EN deactivation - prevents unsafe residual voltage in portable devices. |
| Asymmetric UVLO Hysteresis | 1.75V rising / 1.68V falling threshold prevents oscillation near battery cutoff, ensuring clean shutdown without repeated restart attempts. |
| Thermal-Fault Recovery | Auto-retry after +20°C cooldown from +165°C shutdown - sustains operation under intermittent thermal overload in enclosed designs. |
Applications
| Smartphone Power Rail | LPWAN Modem Supply |
|---|---|
Use Scenario: Powers application processor I/O rail in ultra-thin smartphones where battery voltage drops from 4.2V to 2.8V during discharge. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 3.3V from single-cell Li-ion with seamless mode transition. Use Value: Eliminates need for separate buck + boost converters, reducing BOM count and PCB area by >30% versus discrete solutions. |
Use Scenario: Supplies 3.3V to LTE-M/NB-IoT modems (e.g., u-blox SARA-R5) during burst transmission with peak currents up to 1.2A. IC Role / Device Role / Timing Role: High-current buck-boost regulator with 3.1A ILIM and fast load transient response (<250mV deviation). Use Value: Maintains VOUT stability during 100ms TX bursts, preventing modem reset or dropped connections. |
| Always-On Wearable Sensor | Industrial Bluetooth Beacon |
Use Scenario: Powers MEMS accelerometer and BLE SoC in fitness tracker operating continuously for 7+ days on 120mAh coin cell. IC Role / Device Role / Timing Role: Ultra-low-IQ (6μA) buck-boost maintaining 2.8V output during deep-sleep cycles. Use Value: Extends battery life by 2.1× versus comparable 15μA-IQ regulators under 10μA average load. |
Use Scenario: Supplies 3.0V to industrial-grade BLE beacon deployed in unventilated enclosures with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Thermally robust buck-boost with +125°C junction rating and auto-recovery thermal shutdown. Use Value: Ensures uninterrupted beacon operation without manual intervention during sustained high-temperature exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63802DLCT | 2.5V–5.5V input; 1.8V–5.5V output; 2.5A ILIM; 11μA IQ; 2mm × 2mm QFN-11 | Higher IQ and lower ILIM reduce runtime in battery-critical wearables; smaller package increases layout density but limits thermal dissipation. | Select when board space is constrained and 2.5A output suffices; verify thermal performance at 85°C ambient. |
| RTQ2132BWGQT | 2.5V–5.5V input; 2.5V–5.5V output; 3A ILIM; 13μA IQ; 2.5mm × 2.5mm QFN-16 | Higher minimum input voltage excludes use with deeply discharged Li-ion (<2.5V); larger pin count complicates routing. | Prefer for industrial applications where input stays above 2.5V and higher ESD tolerance (±8kV HBM) is required. |
Compared with TPS63802DLCT and RTQ2132BWGQT, MAX77827CEFD+ uniquely combines 1.8V start-up capability, 3.1A ILIM, and 6μA IQ in a production-proven FC2QFN package - making it the only choice for long-life, deep-discharge Li-ion systems demanding both high peak current and ultra-low sleep current.
Availability
MAX77827CEFD+ is available at Aetrix Electronics and suitable for smartphone power rails, LPWAN modem supplies, always-on wearable sensors, and industrial Bluetooth beacons requiring stable component supply and long-term lifecycle support.
Supply support for MAX77827CEFD+ 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, high-efficiency DC/DC conversion in space-constrained battery-powered devices - specifically engineered to replace multi-regulator solutions with a single buck-boost IC that maintains regulation across the full Li-ion voltage range.
FAQ
What is the switching current limit for MAX77827CEFD+?
The MAX77827CEFD+ has a nominal switching current limit of 3.1A in buck mode and 1.8A in boost mode, as confirmed in Table 1 of the datasheet for "AEWC+/AEFD+/CEWC+/CEFD+" variants. This enables ≥1.6A continuous output at 3.3V in buck configuration, supporting high-pulse RF loads without current limiting.
Does MAX77827CEFD+ support output voltage adjustment?
Yes, MAX77827CEFD+ supports resistor-programmed output voltage from 2.3V to 5.3V via the SEL pin. Table 2 specifies exact RSEL values - for example, an open circuit or short to GND sets VOUT to 3.3V. The IC reads RSEL at power-up and locks the setting until next enable cycle.
What package does MAX77827CEFD+ use?
MAX77827CEFD+ uses the 2.5mm × 2.5mm, 14-lead FC2QFN package (Outline Number 21-100382, Package Code F142A2F+1) with exposed thermal pad. This differs from the 12-bump WLP used by other MAX77827 variants and is optimized for thermal performance in high-current applications.
How does the POK pin function on MAX77827CEFD+?
The POK pin on MAX77827CEFD+ is an open-drain output that asserts high when VOUT rises above 92.5% of target voltage and pulls low when VOUT falls below 90%. It requires an external pull-up resistor and provides system-level power-good monitoring for sequenced power-up of downstream ICs.
What protection features are integrated into MAX77827CEFD+?
MAX77827CEFD+ integrates UVLO (1.75V rise / 1.68V fall), soft-start (200µs for CEFD+), active output discharge (100Ω switch), cycle-by-cycle overcurrent protection (3ms timeout), and thermal shutdown (+165°C with +20°C hysteresis). All protections are hardware-based and require no external components.
MAX77827CEFD+ 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:
- 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)
MAX77827CEFD+ FAQ
1.How can I place an order for MAX77827CEFD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77827CEFD+ 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 MAX77827CEFD+ reliable?
The price and inventory of MAX77827CEFD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77827CEFD+ is usually 5 days.
3.What payment methods are accepted for MAX77827CEFD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77827CEFD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77827CEFD+?
MAX77827CEFD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77827CEFD+ 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 MAX77827CEFD+?
For technical support, including MAX77827CEFD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77827CEFD+ requirements.
6.How does Aetrix verify that MAX77827CEFD+ is sourced from the original manufacturer or authorized distributors?
All MAX77827CEFD+ 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 MAX77827CEFD+ meets industry standards.
7.What is the process for return or replacement of MAX77827CEFD+?
All MAX77827CEFD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77827CEFD+, 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 MAX77827CEFD+ part is unused and in its original packaging.
Return procedure for MAX77827CEFD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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