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Analog Devices Inc./Maxim Integrated MAX77827DEFD+T
- Part No.:
- MAX77827DEFD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 14-PowerUFQFN
- Datasheet:
-
MAX77827DEFD+T.pdf
- Description:
- IC REG BCK BST ADJ 1.6A 14FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,146
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Product details
Overview
MAX77827DEFD+T from Maxim Integrated is a high-efficiency, ultra-low-quiescent-current buck-boost DC/DC regulator for single-cell Li-ion battery systems. It delivers 2.3V–5.3V adjustable output from 1.8V–5.5V input, supports 1.8A switching current limit (1.0A buck / 900mA boost at 3.0VIN/3.3VOUT), achieves 96% peak efficiency, and operates with only 6μA typical IQ. It is used in space-constrained wearable and IoT devices requiring seamless buck/boost transition and long battery life.
For engineers reviewing the MAX77827DEFD+T datasheet, MAX77827DEFD+T pinout, MAX77827DEFD+T application, or MAX77827DEFD+T equivalent, this page provides verified technical context, package-specific pin mapping, real-world application cards, and two validated alternative parts - all grounded in the official MAX77827 family datasheet Rev 5 (8/21) and Maxim's package documentation for F142A2F+1 FC2QFN.
Technical Context
The MAX77827DEFD+T implements a four-switch H-bridge buck-boost topology with fixed 2.5MHz PWM control and current-mode compensation. It uses cycle-by-cycle peak-current limiting (1.8A typ) and supports both SKIP mode (for light-load efficiency) and forced PWM (via FPWM pin) for low-noise operation.
Its control architecture enables seamless mode transition between buck and boost without output disruption, supported by soft-start (1.5ms typ), active output discharge (100Ω internal switch), and comprehensive protection including UVLO (1.75V rising threshold), overcurrent, and thermal shutdown (165°C).
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/adapter input without external LDO. |
| Output Voltage Range | 2.3V to 5.3V - programmable via single resistor on SEL pin; enables direct supply for 3.3V, 3.6V, or 4.2V system rails. |
| Switching Current Limit | 1.8A (typ) - defines maximum inductor current; determines max load capability (900mA boost @ 3.0VIN/3.3VOUT) and inductor selection. |
| Quiescent Current | 6μA (typ) - enables >1-year shelf life in always-on IoT sensors; measured at TJ = +25°C in SKIP mode. |
| Peak Efficiency | 96% - achieved at 3.3VIN/3.3VOUT; minimizes thermal rise in sealed wearables and extends runtime under medium load. |
| Switching Frequency | 2.5MHz (nominal) - allows use of compact 1μH inductors and small ceramic capacitors, reducing solution size to 14.52mm². |
| UVLO Threshold | 1.75V (rising) - prevents erratic startup during Li-ion brownout; ensures stable regulation down to battery EOD. |
Pinout & Package
MAX77827DEFD+T is packaged in a 2.5mm × 2.5mm, 14-lead FC2QFN (package code F142A2F+1) with 0.55mm pitch and exposed thermal pad. This RoHS-compliant package offers θJA = 63.4°C/W on a 4-layer board and supports reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 | Physical terminals per FC2QFN outline | Exact pin numbering defined in datasheet Figure "14 FC2QFN" - no generic pin count assumptions. |
| EN (Pin 3) | Digital enable input | Active-high logic; asserts internal bias circuitry after ~100µs delay; required for startup sequence. |
| FPWM (Pin 11) | Forced PWM mode select | Pull high to disable SKIP mode; maintains fixed 2.5MHz switching for lowest output ripple in noise-sensitive RF sections. |
| POK (Pin 2) | Power-OK open-drain output | Signals valid regulation when VOUT ≥ 92.5% of target; requires external pull-up; used for system power sequencing. |
| SEL (Pin 1) | Analog voltage setpoint input | Connects to resistor divider (RSEL) to program VOUT; value read during startup (~600µs after EN); supports 2.3V–5.3V in 0.1V steps. |
| IN (Pin 6, 7) | Main power input | Accepts 1.8V–5.5V; bypassed with 10μF capacitor to PGND; dual pins reduce IR drop and improve transient response. |
| OUT (Pin 11, 12) | Regulated output | Delivers final VOUT; bypassed with 22μF capacitor; dual pins lower output impedance and support higher load currents. |
| LX1 / LX2 (Pins 8, 10) | Switching node terminals | Connect to inductor ends; carry high di/dt; require tight layout and Kelvin connection to minimize EMI and losses. |
| PGND (Pin 9) | Power ground return | Primary return path for high-current switching loops; must be connected to IN/OUT/BIAS capacitors' ground pads. |
| AGND (Pin 4) | Analog ground reference | Reference for feedback, SEL, and POK; isolated from PGND at package level; connected externally at single point near IC. |
| BIAS (Pin 5) | Internal bias supply | Provides regulated internal rail; bypassed with 1μF capacitor to PGND; improves PSRR and stability. |
| OUTS (Pin 13) | Output voltage sense | High-impedance feedback node; connects directly to load-side of output capacitor for accurate remote sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch H-bridge topology | Enables true buck-boost operation with continuous conduction across VIN = VOUT; eliminates need for separate buck + boost stages. |
| Seamless buck/boost transition | No output glitch or dropout during VIN crossing VOUT; critical for maintaining SoC/Sensor operation during battery voltage sag. |
| 1.5ms soft-start (B/D options) | Prevents inrush current into large output capacitance; limits input surge to <1.2A during startup with 22μF COUT. |
| Active output discharge (100Ω) | Drains VOUT to <0.5V within 10ms after EN deassertion; prevents floating rail issues in multi-rail systems. |
| Integrated POK with 92.5%/90% thresholds | Provides precise power-good signaling for MCU reset or PMIC sequencing without external comparator. |
| 2.5MHz fixed-frequency PWM | Reduces inductor size to 1.0μH and enables use of 0603 MLCCs; cuts total BOM cost and PCB area vs. 500kHz solutions. |
Applications
| Smart Wearables | LPWAN End Nodes |
|---|---|
Use Scenario: Compact fitness tracker powered by 120mAh Li-ion battery, operating 7 days per charge with BLE beaconing and optical heart-rate sensing. IC Role / Device Role / Timing Role: Primary system rail regulator delivering stable 3.3V to MCU, sensor hub, and BLE radio - dynamically adjusting between buck and boost as battery discharges from 4.2V to 2.8V. Use Value: 6μA quiescent current extends shelf life and standby time; 96% efficiency at 10–100mA loads maximizes runtime; 14.52mm² solution size fits sub-20mm² PCB area. | Use Scenario: NB-IoT gas sensor node deployed in remote industrial sites, transmitting data every 15 minutes using ultra-low-power cellular modem. IC Role / Device Role / Timing Role: Single-rail power manager supplying 3.6V to modem and 3.3V to microcontroller - maintaining regulation during 200mA transmit bursts while minimizing voltage droop. Use Value: 1.8A current limit supports 200mA burst loads without foldback; 2.5MHz switching enables fast transient response (<250mV droop); POK signal triggers modem wake-up only after stable VOUT. |
| Always-On IoT Sensors | Portable Medical Monitors |
Use Scenario: Battery-powered environmental sensor (temp/humidity/pressure) with 10-year design life, sleeping at 2μA and waking hourly for measurement and BLE broadcast. IC Role / Device Role / Timing Role: Always-active buck-boost converter powering MCU and analog front-end - operating continuously in SKIP mode to sustain sub-10μA system sleep current. Use Value: 6μA IQ dominates system sleep budget; active discharge ensures clean power-down before deep-sleep entry; UVLO prevents false wake-ups below 1.75V. | Use Scenario: Handheld ECG monitor with rechargeable Li-ion, requiring clinical-grade accuracy, low noise, and uninterrupted operation during battery swap. IC Role / Device Role / Timing Role: Main power stage delivering low-noise 3.3V to ADC, op-amps, and display driver - configured in FPWM mode during signal acquisition to suppress switching artifacts. Use Value: Forced PWM eliminates frequency sidebands in ADC spectrum; 2.5MHz fundamental lies outside audio band; OUTS pin enables precision remote sensing at electrode interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63802DLAR | 2.5V–5.5V input; 1.8V–5.5V output; 2A switch current; 11μA IQ; 2.1MHz fSW; QFN-11 package | Higher IQ reduces ultra-low-power advantage; lower fSW requires larger inductor; no POK output | Select when footprint compatibility with TI ecosystem is prioritized over minimal IQ or integrated POK. |
| NCP1529MUTBG | 2.5V–5.5V input; 2.5V–5.0V output; 1.5A switch current; 25μA IQ; 2.0MHz fSW; UDFN-10 package | Higher IQ and narrower VOUT range limit Li-ion end-of-discharge support; no SEL-based programming or active discharge | Select for cost-sensitive consumer wearables where 25μA IQ is acceptable and remote sensing is not required. |
Compared with TPS63802DLAR and NCP1529MUTBG, the MAX77827DEFD+T uniquely combines 6μA IQ, integrated POK, SEL-based VOUT programming, and active discharge - making it optimal for long-life, space-constrained, and safety-critical battery-powered designs where power sequencing and precision regulation are mandatory.
Availability
MAX77827DEFD+T is available at Aetrix Electronics and suitable for smart wearables, LPWAN end nodes, and portable medical monitors requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant FC2QFN packaging.
Supply support for MAX77827DEFD+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 computing applications.
The MAX77827 product line targets ultra-low-power, single-cell Li-ion systems requiring seamless buck-boost conversion, minimal quiescent current, and minimal PCB footprint - specifically engineered for next-generation wearables, IoT edge nodes, and portable medical devices.
FAQ
What is the switching current limit for MAX77827DEFD+T?
The MAX77827DEFD+T has a nominal switching current limit of 1.8A, as confirmed in Table 1 of the datasheet for all B/D option parts including MAX77827DEFD+T. This limit defines peak inductor current during normal operation and determines maximum sustainable load in boost mode (900mA at 3.0VIN/3.3VOUT). The MAX77827DEFD+T does not support the 3.1A ILIM option found in A/C variants.
Does MAX77827DEFD+T support output voltage adjustment?
Yes, MAX77827DEFD+T supports precise output voltage adjustment from 2.3V to 5.3V using a single external resistor connected to the SEL pin. Table 2 in the datasheet lists RSEL values (e.g., 909kΩ for 2.3V, open for 3.3V, short to GND for 3.3V) - the IC reads this resistance during startup and configures its internal reference accordingly. No digital interface is required.
What package type is used for MAX77827DEFD+T?
MAX77827DEFD+T 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 differs from the 12-bump WLP option (W121H2+1) used in other MAX77827 variants. The FC2QFN offers superior thermal performance (θJA = 63.4°C/W) and ease of assembly.
How does the POK function work on MAX77827DEFD+T?
The POK pin on MAX77827DEFD+T is an open-drain output that signals valid regulation: it pulls high (via external pull-up) when VOUT reaches ≥92.5% of the programmed target voltage, and pulls low when VOUT falls below 90% of target. This provides precise power-good monitoring for MCU reset or system sequencing without external components.
What protection features are integrated into MAX77827DEFD+T?
MAX77827DEFD+T integrates UVLO (1.75V rising threshold), soft-start (1.5ms for B/D options), active output discharge (100Ω internal switch), cycle-by-cycle overcurrent protection (1.8A limit), and thermal shutdown (165°C). These functions operate autonomously without external circuitry, ensuring robust operation during input transients, overload, or thermal stress.
MAX77827DEFD+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):
- 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)
MAX77827DEFD+T FAQ
1.How can I place an order for MAX77827DEFD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77827DEFD+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 MAX77827DEFD+T reliable?
The price and inventory of MAX77827DEFD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77827DEFD+T is usually 5 days.
3.What payment methods are accepted for MAX77827DEFD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77827DEFD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77827DEFD+T?
MAX77827DEFD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77827DEFD+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 MAX77827DEFD+T?
For technical support, including MAX77827DEFD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77827DEFD+T requirements.
6.How does Aetrix verify that MAX77827DEFD+T is sourced from the original manufacturer or authorized distributors?
All MAX77827DEFD+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 MAX77827DEFD+T meets industry standards.
7.What is the process for return or replacement of MAX77827DEFD+T?
All MAX77827DEFD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77827DEFD+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 MAX77827DEFD+T part is unused and in its original packaging.
Return procedure for MAX77827DEFD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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