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Analog Devices Inc./Maxim Integrated MAX77720SANP+
- Part No.:
- MAX77720SANP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-XFBGA, WLBGA
- Datasheet:
-
MAX77720SANP+.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 20WLP
- Quantity:
- Payment:
- Shipping:
Inventory:1,296
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Product details
Overview
MAX77720SANP+ from Analog Devices is a dual-polarity power management IC integrating an inverting buck-boost (IBB) and a boost regulator, delivering up to +20V positive and −24V negative outputs from a 2.5V–5.5V input. It supports independent voltage programming, fixed 1MHz/1.5MHz switching frequencies, and I²C-configurable timing for ToF sensor and OLED display biasing in compact IoT edge devices.
For engineers reviewing the MAX77720SANP+ datasheet, MAX77720SANP+ pinout, MAX77720SANP+ application, or MAX77720SANP+ equivalent, key selection criteria include bipolar output range, WLP-20 bump package compatibility, I²C register-level fault control, and thermal/overcurrent protection behavior under dynamic load transients.
Technical Context
The MAX77720SANP+ implements two independent DC-DC topologies: a synchronous boost converter (1MHz fixed frequency, programmable peak current limit 0.5A–1.0A) and an inverting buck-boost converter (1.5MHz fixed frequency, ±1.5% FB accuracy). Both regulators support soft-start with configurable turn-on/off delays (0.2ms–3.2ms), enabling controlled sequencing for sensitive analog front-ends.
Its bidirectional I²C interface (1.2V–3.6V VIO-compatible) provides real-time status monitoring (nIRQ), error signaling (nERR), and power-good indication (POK), while factory OTP settings allow preconfiguration of startup behavior, UVLO/OVLO thresholds, and thermal shutdown hysteresis without runtime writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB VBUS, and wide-input industrial rails without external LDO pre-regulation. |
| Positive Output Range | +0.5V to +20V - programmable via I²C for OLED gate drivers, sensor bias, or op-amp supplies. |
| Negative Output Range | −24V to −1.5V - adjustable down to −24V for ToF avalanche photodiode (APD) reverse biasing. |
| Switching Frequencies | Boost: 1MHz; IBB: 1.5MHz - enables compact 1μH–2.2μH inductors and reduces EMI filtering burden in noise-sensitive imaging systems. |
| Quiescent Current | 235μA (main bias on) - minimizes standby power in battery-operated smart sensors with infrequent wake cycles. |
| Operating Temperature | −40°C to +125°C - qualified for automotive cabin, industrial edge, and outdoor IoT deployments. |
| Package | WLP-20 (2.15mm × 1.80mm × 0.5mm, 0.4mm pitch) - ultra-small footprint for space-constrained wearable and module-integrated designs. |
Pinout & Package
MAX77720SANP+ uses a 20-bump wafer-level package (WLP) with 5×4 array layout, 0.4mm pitch, and 2.15mm × 1.80mm body size. Bump-side-down mounting requires precise stencil design per Application Note 1891.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Active-high logic control for global regulator enable/disable; threshold 0.36V (IL) / 0.84V (IH). |
| nERR | Error input/output | Open-drain bidirectional pin: driven low by device on fault; pulled high externally to signal error to host MCU. |
| nIRQ | Interrupt output | Open-drain flag indicating register-accessible events (OCP, OTLO, POK transition, I²C NACK). |
| POK | Power-good output | Open-drain indicator asserting high when both outputs are within ±5% regulation tolerance. |
| SCL/SDA | I²C interface | Standard two-wire bus (100kHz/400kHz) supporting read/write to 16-bit register map with ACK/NACK protocol. |
| IN/INIBB | Input power rails | IN powers boost stage; INIBB powers inverting buck-boost stage - allows separate input filtering or source isolation. |
| LXBST/LXIBB | Switch node terminals | High-current switching nodes requiring low-inductance routing and local ceramic decoupling near package. |
| FBBST/FBIBB | Feedback inputs | Resistive divider inputs for output voltage setting; FBIBB referenced to GNDIBB, not AGND. |
| AGND/PGNDBST/GNDIBB | Ground terminals | Separate analog, boost power, and IBB power grounds - must be connected at single point under device to avoid ground bounce. |
| OUTBST/OUTIBB | Output terminals | Regulated positive and negative outputs; OUTIBB is inverted relative to INIBB and referenced to GNDIBB. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ for Boost | Disables internal FETs and disconnects LX from IN, reducing leakage to ≤3μA during deep sleep. |
| Programmable Peak Current Limit | Four selectable levels (0.5A–1.0A) for boost inductor sizing and transient response tuning without hardware change. |
| Controlled Inrush Current | Soft-start ramp rate fixed at 7mV/μs (with 20μF output cap), limiting input surge during power-up. |
| Factory OTP Configuration | Preprograms UVLO/OVLO thresholds, POR hysteresis, and default rail sequencing - eliminates boot-time I²C writes. |
| Thermal-Shutdown Protection | Locks out both regulators at +165°C junction temperature with 15°C hysteresis to prevent thermal runaway. |
Applications
| Time-of-Flight (ToF) Sensor Biasing | OLED Display Power Supply |
|---|---|
Use Scenario: Providing reverse-bias voltage to avalanche photodiodes (APDs) in smartphone or AR/VR depth-sensing modules. IC Role / Device Role / Timing Role: Dual-polarity PMIC generating −24V for APD bias and +12V for ToF transmitter driver, sequenced with 1ms delay to prevent cross-coupling. Use Value: Enables single-chip bias solution replacing discrete charge pumps and LDOs, reducing BOM count by 4 components and PCB area by 35mm². | Use Scenario: Supplying gate voltages (VDD/VSS) and analog supply (AVDD) for active-matrix OLED panels in portable medical monitors. IC Role / Device Role / Timing Role: Generating +18V (ELVDD), −8V (ELVSS), and +3.3V (AVDD) from 3.8V battery, with independent enable control per rail. Use Value: Eliminates need for external DC-DC controllers and discrete MOSFETs, achieving <1.2% output ripple at full brightness while maintaining −40°C to +85°C operation. |
| Bipolar Amplifier Power | Industrial Sensor Signal Conditioning |
Use Scenario: Powering rail-to-rail op-amps and precision ADC drivers in handheld test equipment requiring symmetric ±15V supplies. IC Role / Device Role / Timing Role: Delivering matched +15V/−15V outputs with <0.5% tracking error across temperature, synchronized via I²C-controlled power-up delay. Use Value: Replaces dual isolated DC-DC modules with 75% smaller footprint and 40% lower no-load power consumption (235μA vs. 1.2mA). | Use Scenario: Biasing MEMS accelerometers and piezoelectric transducers in predictive maintenance vibration sensors deployed in factory environments. IC Role / Device Role / Timing Role: Providing −12V for transducer excitation and +5V for signal chain bias, with nIRQ-triggered diagnostics on overtemperature or short-circuit events. Use Value: Integrates fault reporting into host firmware via I²C register reads, reducing diagnostic latency from seconds to sub-millisecond. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-polarity PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65136RTER | Fixed +15V/−15V outputs; no I²C interface; 3mm × 3mm QFN-16 package. | Targeted at cost-sensitive displays only; lacks programmability for ToF or sensor bias scaling. | Select when fixed outputs and minimal firmware integration are acceptable. |
| LT3905EDE#TRPBF | Single-output inverting buck-boost (−36V max); no integrated boost; 16-lead DFN package. | Requires external boost stage for positive rail; suited for high-voltage negative-only applications like spectroscopy. | Select when negative output >−24V is required and positive rail can be sourced separately. |
Compared with TPS65136RTER and LT3905EDE#TRPBF, the MAX77720SANP+ uniquely combines programmable bipolar outputs, I²C configurability, and ultra-compact WLP packaging - making it the only option supporting dynamic voltage scaling for next-gen ToF and OLED systems in sub-10mm² footprints.
Availability
MAX77720SANP+ is available at Aetrix Electronics and suitable for time-of-flight sensor modules, OLED display subsystems, and bipolar amplifier circuits requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MAX77720SANP+ 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX77720SANP+ belongs to the MAX® Power Management family, engineered specifically for compact, high-efficiency bias generation in optical sensing and emissive display applications where space, thermal headroom, and dynamic voltage control are critical.
FAQ
What is the maximum negative output voltage supported by the MAX77720SANP+?
The MAX77720SANP+ supports a programmable negative output voltage down to −24V via its inverting buck-boost regulator. This capability is confirmed in the General Description and Electrical Characteristics sections of the datasheet, where the IBB output range is explicitly specified as "down to −24V" with ±1.5% feedback accuracy. The −24V limit applies under recommended operating conditions (VIN = 2.5V–5.5V, TJ = −40°C to +125°C) and requires appropriate external components (inductor, diode, capacitor) sized per the datasheet's Application Information section.
Does the MAX77720SANP+ support independent enable control for its positive and negative outputs?
Yes, the MAX77720SANP+ supports independent enable control for its boost and inverting buck-boost regulators via I²C register bits CNFG_DCDC0.EN_BST and CNFG_DCDC0.EN_IBB. These bits allow software-selectable sequencing with programmable turn-on and turn-off delays ranging from 0.2ms to 3.2ms. The EN pin provides global hardware enable, but individual rail control is exclusively register-based - enabling precise power sequencing for sensitive analog circuits without additional external logic.
What package type and dimensions does the MAX77720SANP+ use?
The MAX77720SANP+ uses a 20-bump wafer-level package (WLP) with outline number 21-100659, measuring 2.15mm × 1.80mm × 0.5mm and featuring a 0.4mm bump pitch in a 5×4 array. This package is documented in the "Package Information" section of the datasheet and is distinct from QFN or WSON variants. The "+" suffix in MAX77720SANP+ indicates RoHS-compliant, lead-free finish. Land pattern design must follow Application Note 1891 to ensure reliable solder joint formation and thermal performance.
How does the nERR pin function in the MAX77720SANP+?
The nERR pin on the MAX77720SANP+ is a bidirectional open-drain terminal used for external fault signaling and recovery. When an internal fault occurs (e.g., overtemperature, overcurrent, or output short), the device pulls nERR low. An external host processor can clear the fault condition by writing to the CNFG_GLBL.EN_IBB or CNFG_GLBL.EN_BST register via I²C, after which the regulators re-enable automatically. The pin also supports active discharge control - allowing system designers to configure whether outputs float (high-Z) or discharge rapidly during error states, as detailed in Figure 4 and Section "nERR Error Pin" of the datasheet.
What is the purpose of the separate IN and INIBB pins on the MAX77720SANP+?
The MAX77720SANP+ features separate IN and INIBB input pins to isolate the power paths for the boost and inverting buck-boost regulators. IN supplies the boost stage, while INIBB supplies the IBB stage - enabling independent input filtering, source selection (e.g., different battery taps), or fault containment. This separation prevents coupling between the two switching stages and improves PSRR for noise-sensitive loads. The Absolute Maximum Ratings table confirms distinct voltage limits: IN to AGND is rated to +6.0V, whereas INIBB to GNDIBB is rated to +6V, underscoring their independent electrical domains.
MAX77720SANP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-XFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive and Negative
- Topology:
- Boost, Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 20V, -24V
- Current - Output:
- -
- Frequency - Switching:
- 1MHz, 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WLP (2.12x1.77)
MAX77720SANP+ FAQ
1.How can I place an order for MAX77720SANP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77720SANP+ 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 MAX77720SANP+ reliable?
The price and inventory of MAX77720SANP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77720SANP+ is usually 5 days.
3.What payment methods are accepted for MAX77720SANP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77720SANP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77720SANP+?
MAX77720SANP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77720SANP+ 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 MAX77720SANP+?
For technical support, including MAX77720SANP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77720SANP+ requirements.
6.How does Aetrix verify that MAX77720SANP+ is sourced from the original manufacturer or authorized distributors?
All MAX77720SANP+ 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 MAX77720SANP+ meets industry standards.
7.What is the process for return or replacement of MAX77720SANP+?
All MAX77720SANP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77720SANP+, 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 MAX77720SANP+ part is unused and in its original packaging.
Return procedure for MAX77720SANP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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