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Analog Devices Inc./Maxim Integrated MAX77827DEFD+
- Part No.:
- MAX77827DEFD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 14-PowerUFQFN
- Datasheet:
-
MAX77827DEFD+.pdf
- Description:
- IC REG BCK BST ADJ 1.6A 14FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,518
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Product details
Overview
MAX77827DEFD+ from Maxim Integrated is a high-efficiency, ultra-low-quiescent-current (6μA) buck-boost DC/DC regulator in a 2.5mm × 2.5mm FC2QFN-14 package, supporting 1.8V–5.5V input and 2.3V–5.3V adjustable output. It delivers up to 900mA in boost mode (VIN = 3.0V, VOUT = 3.3V) with 1.8A switching current limit and achieves 96% peak efficiency - optimized for single-cell Li-ion portable systems including wearables and LPWAN modems.
For engineers reviewing the MAX77827DEFD+ datasheet, MAX77827DEFD+ pinout, MAX77827DEFD+ application, or MAX77827DEFD+ equivalent, key selection criteria include its 2.5MHz fixed-frequency PWM control, FPWM/POK GPIO support, seamless buck-boost transition, 1.8A ILIM option, and integrated protections (UVLO, OCP, thermal shutdown, active discharge).
Technical Context
The MAX77827DEFD+ implements a four-switch H-bridge topology enabling continuous regulation across VIN < VOUT (boost), VIN ≈ VOUT (buck-boost boundary), and VIN > VOUT (buck) without mode switching artifacts. Its current-mode PWM control operates at 2.25–2.75MHz (typ 2.5MHz), with cycle-by-cycle overcurrent protection triggered at 1.8A (typ) peak switch current and soft-start time of 1.5ms (typ).
It features dual ground domains (AGND and PGND), separate bias rail (BIAS), output sense (OUTS), and programmable output voltage via resistor-divider on SEL pin - with confirmed RSEL values mapping to precise VOUT points (e.g., open/short = 3.3V). The device supports forced PWM via FPWM pin and provides POK monitoring with 92.5%/90% rising/falling thresholds relative to VOUT_TARGET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full discharge range of 1-cell Li-ion (2.7V–4.2V nominal, down to ~2.5V cutoff) with margin. |
| Output Voltage Range | 2.3V to 5.3V - set by external resistor on SEL pin; open/short yields 3.3V, enabling common logic rail generation. |
| Switching Current Limit | 1.8A (typ) - defines maximum inductor peak current; enables 900mA boost-mode output at 3.0VIN/3.3VOUT. |
| Quiescent Current | 6μA (typ at +25°C) - minimizes battery drain during system sleep, critical for multi-year IoT endpoint operation. |
| Peak Efficiency | 96% - achieved at 3.3VIN/3.3VOUT, reducing thermal load and extending runtime in space-constrained wearables. |
| Switching Frequency | 2.5MHz (nominal) - allows use of small 1μH inductors and compact 0603/0805 capacitors for minimal solution size (~14.52mm²). |
| Protections | UVLO (1.75V rising), thermal shutdown (+165°C), OCP, soft-start, and active output discharge (100Ω internal switch). |
Pinout & Package
MAX77827DEFD+ uses the 2.5mm × 2.5mm, 14-lead FC2QFN package (package code F142A2F+1), with exposed thermal pad connected to PGND for enhanced power dissipation (θJA = 63.4°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SEL, POK | SEL sets output voltage via resistor divider; POK is open-drain power-good indicator with 92.5%/90% VOUT thresholds. |
| 3, 4 | EN, PGND | EN enables/disables regulation; PGND is dedicated power ground for high-current LX paths and thermal pad connection. |
| 5–7 | LX1, IN, BIAS | LX1 is high-side switch node; IN supplies main power path; BIAS powers internal analog circuitry (bypass with 1μF). |
| 8–10 | AGND, LX2, OUT | AGND isolates sensitive analog references; LX2 is second switch node; OUT delivers regulated output (bypass with 22μF). |
| 11–14 | OUTS, FPWM, EN, PGND | OUTS enables remote sensing for improved load regulation; FPWM forces PWM mode; duplicate EN/PGND pins reduce layout impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transition | H-bridge topology eliminates mode-switching discontinuities, maintaining stable output during battery voltage sag across 3.6V–2.8V range. |
| Ultra-Low IQ Operation | 6μA quiescent current extends shelf life and standby time in always-on IoT sensors without compromising startup speed. |
| Configurable Switching Current | 1.8A ILIM option (confirmed for MAX77827DEFD+) optimizes inductor sizing for 900mA boost loads while limiting peak stress. |
| Integrated Active Discharge | 100Ω internal switch discharges output capacitor when disabled, preventing unsafe residual voltage in safety-critical systems. |
| Robust Protection Suite | Includes UVLO with hysteresis, thermal shutdown (+165°C), cycle-by-cycle OCP, and soft-start - eliminating need for external supervision circuits. |
Applications
| Smart Wearables | LPWAN Modems |
|---|---|
Use Scenario: Compact fitness tracker powered by 1-cell Li-ion, requiring stable 3.3V rail across full battery discharge (4.2V → 2.7V). IC Role / Device Role / Timing Role: Primary system power regulator delivering regulated 3.3V to MCU, BLE radio, and sensor hub. Use Value: 96% peak efficiency and 6μA IQ maximize runtime; 2.5MHz switching enables tiny 1μH inductor and 0603 caps for <15mm² total solution size. | Use Scenario: NB-IoT cellular module operating intermittently in deep-sleep mode with brief transmission bursts. IC Role / Device Role / Timing Role: Buck-boost supply ensuring consistent 3.3V to RF transceiver during TX peaks and ultra-low leakage during 10+ hour sleep cycles. Use Value: SKIP mode reduces light-load IQ to 6μA; FPWM pin enables deterministic low-noise PWM during TX for clean RF performance. |
| Portable Medical Sensors | Low-Power Industrial Telemetry |
Use Scenario: FDA-class wearable ECG patch using coin-cell or micro-LiPo, needing precise 2.8V analog rail with tight regulation. IC Role / Device Role / Timing Role: Precision-adjustable regulator (via SEL resistor) generating 2.8V ±1% for ADC reference and analog front-end. Use Value: 1% output accuracy in PWM mode and 0.4%/V line regulation ensure signal integrity; OUTS pin enables remote sensing for <1% load regulation error. | Use Scenario: Wireless vibration sensor node deployed in remote industrial settings, powered by energy harvesting or long-life primary cell. IC Role / Device Role / Timing Role: Primary power converter sustaining 3.0V system rail during burst-mode data acquisition and wireless upload. Use Value: Thermal shutdown (+165°C) and active discharge protect against fault conditions; 1.8A ILIM supports transient 500mA sensor actuation loads without dropout. |
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 | 3.5V–12V input; 1.2V–5.5V output; 2A ILIM; 2.4MHz switching; no POK or FPWM pins. | Requires higher minimum input; lacks dedicated power-good and forced-PWM control signals. | Choose when wider input range is needed and GPIO flexibility is secondary to cost. |
| RT6150BGQW | 2.5V–5.5V input; 2.5V–5.5V output; 2.5A ILIM; 1.5MHz switching; includes POK but no FPWM. | Lower switching frequency increases inductor/capacitor size; missing FPWM limits ripple control in noise-sensitive RF sections. | Prefer for higher output current needs where 1.5MHz operation is acceptable and POK suffices. |
Compared with TPS63020DSJR and RT6150BGQW, MAX77827DEFD+ offers superior light-load efficiency (6μA IQ), integrated FPWM/POK for system-level control, and smaller 2.5MHz solution size - making it optimal for space- and battery-limited portable designs where precision regulation and low-noise operation are critical.
Availability
MAX77827DEFD+ is available at Aetrix Electronics and suitable for smart wearables, LPWAN modems, and portable medical sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77827DEFD+ 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 portable applications.
The MAX77827 product line targets ultra-low-power, high-efficiency DC/DC conversion in space-constrained battery-powered devices - emphasizing minimal quiescent current, seamless buck-boost operation, and integrated system-level features like POK and FPWM.
FAQ
What is the confirmed switching current limit for MAX77827DEFD+?
The MAX77827DEFD+ has a confirmed typical switching current limit of 1.8A, as specified in Table 1 of the datasheet for parts ending in "DEFD+". This value determines maximum inductor peak current and supports up to 900mA output in boost mode at 3.0VIN/3.3VOUT. It is distinct from the 3.1A option used in "AEFD+" variants.
Does MAX77827DEFD+ support remote output voltage sensing?
Yes, MAX77827DEFD+ supports remote sensing via the OUTS pin, which connects directly to the load-side output node. This compensates for PCB trace IR drop, improving load regulation to within ±0.25%/A - critical for precision analog rails in portable medical sensors and instrumentation.
How does the soft-start behavior differ for MAX77827DEFD+ compared to other MAX77827 variants?
MAX77827DEFD+ has a typical soft-start time of 1.5ms, per Table 1. This is longer than the 200µs soft-start of "AEFD+" variants, providing gentler inrush current control during startup - beneficial for systems with limited input capacitance or weak battery sources.
What is the function of the BIAS pin on MAX77827DEFD+?
The BIAS pin on MAX77827DEFD+ supplies internal analog circuitry and must be bypassed to PGND with a 1μF capacitor. It operates independently from the main IN rail, improving PSRR and stability of the error amplifier and reference - essential for maintaining tight output accuracy under dynamic load conditions.
Can MAX77827DEFD+ operate with an input voltage below 2.6V?
Yes, MAX77827DEFD+ supports input voltages as low as 1.8V, unlike "B" and "C" variants which require ≥2.6V. This extended range enables reliable operation down to end-of-discharge for 1-cell Li-ion batteries (≈2.5V), making MAX77827DEFD+ ideal for deep-sleep IoT endpoints and wearables with aggressive battery utilization.
MAX77827DEFD+ 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):
- 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)
MAX77827DEFD+ FAQ
1.How can I place an order for MAX77827DEFD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77827DEFD+ 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+ reliable?
The price and inventory of MAX77827DEFD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77827DEFD+ is usually 5 days.
3.What payment methods are accepted for MAX77827DEFD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77827DEFD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77827DEFD+?
MAX77827DEFD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77827DEFD+ 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+?
For technical support, including MAX77827DEFD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77827DEFD+ requirements.
6.How does Aetrix verify that MAX77827DEFD+ is sourced from the original manufacturer or authorized distributors?
All MAX77827DEFD+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX77827DEFD+?
All MAX77827DEFD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77827DEFD+, 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+ part is unused and in its original packaging.
Return procedure for MAX77827DEFD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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