ADP172ACBZ-2.1-R7 Analog Devices Integrated Circuit (Other) In Stock
Analog Devices ADP172ACBZ-2.1-R7 is a fixed 2.1 V CMOS ultra-low dropout linear regulator with 50 mV typical dropout voltage, input range of 1.6 V to 3.6 V, and a 4-ball WLCSP package ideal for space-constrained portable designs. From $1 in stock worldwide shipping.
- Manufacturer
- Analog Devices
- Package
- Other
- Pin Count
- 4
- Lifecycle
- ACTIVE
- Datasheet
- ADP172ACBZ-2.1-R7 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Ultra-low dropout voltage of 50 mV typical and 100 mV maximum at rated load, enabling efficient regulation from lithium-ion battery voltages down to near-output-rail inputs
- Fixed 2.1 V output in a 4-ball WLCSP (R-PBGA-B4) package, delivering the smallest possible footprint for wearable and IoT power supply designs
- Input voltage range of 1.6 V to 3.6 V with 4 V absolute maximum, compatible with single-cell Li-ion and coin-cell battery chemistries in portable consumer electronics
Applications
The ADP172ACBZ-2.1-R7 is designed for powering low-voltage subsystems in wearable devices, wireless sensor nodes, and portable consumer electronics where board space and battery life are premium constraints. Its 50 mV typical dropout voltage allows the regulator to remain in regulation even when the battery voltage approaches 2.1 V, extending usable battery runtime. The 4-ball WLCSP footprint makes it suitable for extremely compact PCB layouts in hearing aids, smartwatch modules, and Bluetooth Low Energy sensor tags.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | CB-4-4 |
| YTEOL | 10 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 0.1V |
| Dropout Voltage1-Nom | 0.05V |
| Input Voltage Absolute-Max | 4V |
| Input Voltage-Max | 3.6V |
| Input Voltage-Min | 1.6V |
| JESD-30 Code | R-PBGA-B4 |
| JESD-609 Code | e1 |
| Line Regulation-Max | 0.0105% |
| Load Regulation-Max | 0.0314% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 0.3A |
| Output Voltage1-Max | 2.1315V |
| Output Voltage1-Min | 2.037V |
| Output Voltage1-Nom | 2.1V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | BGA4,2X2,20 |
| Package Shape | RECTANGULAR |
| Package Style | GRID ARRAY, VERY THIN PROFILE, FINE PITCH |
| Packing Method | TR, 7 INCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Technology | CMOS |
| Terminal Finish | Tin/Silver/Copper (Sn/Ag/Cu) |
| Terminal Form | BALL |
| Terminal Pitch | 0.5mm |
| Terminal Position | BOTTOM |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 3% |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How low can the input voltage drop before the ADP172ACBZ-2.1-R7 falls out of regulation on a 2.1 V output rail?
The ADP172ACBZ-2.1-R7 has a typical dropout voltage of 50 mV and a maximum of 100 mV, meaning the input voltage must remain above approximately 2.2 V to maintain a regulated 2.1 V output. On a single-cell Li-ion battery discharging from 4.2 V down to 2.2 V, the regulator continues supplying 2.1 V throughout most of the discharge cycle, maximizing usable battery capacity.
Which battery chemistries are compatible with the ADP172ACBZ-2.1-R7's 1.6 V to 3.6 V input range?
The 1.6 V to 3.6 V input range is compatible with single-cell lithium-ion batteries (3.0 V to 4.2 V at the input is above range; the part suits the tail end), single-cell LiFePO4 (3.2 V nominal), and 3 V coin cells such as the CR2032. For single-cell Li-ion, the input range restricts operation to the lower portion of the discharge curve, so it is best paired with a 3.3 V or lower supply rail.
How much PCB area does the 4-ball WLCSP package of the ADP172ACBZ-2.1-R7 occupy compared to a SOT-23 LDO?
The 4-ball WLCSP (R-PBGA-B4) package occupies approximately 0.4 mm x 0.4 mm per ball pitch, with a total die footprint under 0.6 mm², which is significantly smaller than a standard SOT-23 package that occupies roughly 1.6 mm x 2.9 mm. This size difference of more than 10x makes the WLCSP the preferred choice for ultra-compact wearable and hearing aid designs.
When should a designer choose the ADP172ACBZ-2.1-R7 over an adjustable LDO in a portable product power tree?
A fixed-output LDO like the ADP172ACBZ-2.1-R7 is preferable when the 2.1 V output voltage is a standard system rail, because it eliminates the 2 external resistors needed for an adjustable LDO, saving board space and reducing resistor noise injection. The fixed variant also simplifies BOM management in high-volume production and avoids resistor tolerance errors that can shift the output by ±1% or more in adjustable configurations.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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