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Analog Devices Inc. ADP2121ACBZ-1.85R7
- Part No.:
- ADP2121ACBZ-1.85R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFBGA, WLCSP
- Datasheet:
-
ADP2121ACBZ-1.85R7.pdf
- Description:
- IC REG BUCK 1.85V 600MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:5,898
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Product details
Overview
ADP2121ACBZ-1.85R7 from Analog Devices is a 6 MHz synchronous step-down DC-to-DC converter delivering up to 600 mA output current with fixed 1.85 V output, 2.3 V–5.5 V input range, and 92% peak efficiency. It integrates internal synchronous rectification, soft start, and output short-circuit protection for compact portable power rails.
For engineers reviewing the ADP2121ACBZ-1.85R7 datasheet, ADP2121ACBZ-1.85R7 pinout, ADP2121ACBZ-1.85R7 application, or ADP2121ACBZ-1.85R7 equivalent, this page provides verified technical context, package mapping, functional alternatives, and design-meaning specifications for battery-powered embedded systems requiring ultra-small footprint and low-quiescent-current regulation.
Technical Context
The ADP2121ACBZ-1.85R7 uses a hybrid voltage-mode control architecture with automatic PFM/PWM mode transition based on load current-enabling 36 µA quiescent current in auto mode while maintaining 6 MHz PWM operation under heavy load. Its internal compensation eliminates external loop components.
It features cycle-by-cycle current limiting (790–1222 mA), undervoltage lockout (2.1–2.3 V rising threshold), thermal shutdown (150°C), and logic-controlled enable/shutdown with 0.3 µA typical shutdown current. The 1.85 V output variant has 75 µs typical soft-start time and ±3% output voltage accuracy across temperature and line/load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.85 V - eliminates external feedback resistors; optimized for core voltage of low-power microcontrollers and RF ICs. |
| Max Output Current | 600 mA at VIN ≥ 2.7 V - supports full-load operation from single Li+/Li− polymer cell without derating. |
| Switching Frequency | 6 MHz (5.36–6.64 MHz) - enables use of 0.47 µH multilayer inductors ≤ 1.0 mm² footprint and 0402 ceramic capacitors. |
| Quiescent Current | 36 µA (typical, auto mode, no load) - extends battery life in always-on sensor nodes and standby subsystems. |
| Input Voltage Range | 2.3 V to 5.5 V - compatible with 1-cell Li+/Li− polymer, 3-cell alkaline/Ni-MH, and USB-powered inputs. |
| Efficiency | 92% peak at 150–300 mA - minimizes thermal rise in sealed handheld enclosures with limited airflow. |
| Shutdown Current | 0.3 µA (typical, VOUT = 1.85 V) - ensures negligible battery drain during deep-sleep states. |
Pinout & Package
ADP2121ACBZ-1.85R7 uses an ultrasmall 6-ball, 0.4 mm pitch, 1.17 mm² WLCSP (Wafer-Level Chip Scale Package) with bottom-side solder bumps. Thermal resistance is 105°C/W on 4-layer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | MODE | Mode select input: low = auto (PFM/PWM), high = forced PWM; must be actively driven-no floating allowed. |
| B1 | SW | Switch node: connects to inductor and diode/capacitor network; requires tight layout to minimize EMI and switching losses. |
| C1 | FB | Feedback input: internally tied to 1.85 V reference; no external resistor divider needed-simplifies layout and improves accuracy. |
| A2 | VIN | Main power input: accepts 2.3–5.5 V; requires local 2.2 µF X5R ceramic capacitor placed within 2 mm of ball. |
| B2 | EN | Enable logic input: high ≥1.3 V enables regulator; low ≤0.4 V disables with sub-µA supply current. |
| C2 | GND | Ground reference: shared analog/digital ground plane; must connect directly to thermal pad and input/output capacitor grounds. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectifier | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by 5–10% vs. asynchronous designs. |
| Auto Mode (PFM + PWM) | Dynamically switches between PFM (low IQ) and PWM (stable regulation) based on load-no firmware or external control required. |
| Internal Compensation | Removes need for external compensation network; guarantees stability with standard 0.47 µH/4.7 µF output filter. |
| Output Short-Circuit Protection | Shuts down SW node upon VOUT-to-GND fault; recovers automatically after fault removal-prevents system-level damage. |
| Ultrasmall WLCSP | 1.17 mm² footprint with 0.4 mm pitch-fits in space-constrained modules like Bluetooth earbuds and wearable sensors. |
Applications
| Mobile Phone Power Management | Digital Camera Sensor Rail |
|---|---|
|
Use Scenario: Regulating core voltage for application processors and baseband ICs during burst-mode LTE transmission. IC Role / Device Role / Timing Role: Primary buck converter supplying 1.85 V to SoC I/O and memory interfaces with fast transient response. Use Value: 6 MHz switching and 92% efficiency reduce thermal load and extend talk-time per charge cycle. |
Use Scenario: Powering CMOS image sensor digital backend and ADC during high-frame-rate capture. IC Role / Device Role / Timing Role: Low-noise, fast-settling 1.85 V rail ensuring clean timing margins for pixel readout clocks. Use Value: 75 µs soft-start prevents sensor initialization glitches; auto mode cuts idle current to 36 µA. |
| Portable Audio DAC Supply | Wearable Health Monitor MCU Core |
|
Use Scenario: Generating clean 1.85 V supply for stereo DAC and headphone amplifier in Bluetooth headphones. IC Role / Device Role / Timing Role: Noise-sensitive analog rail with minimal switching ripple due to internal synchronous rectification. Use Value: 92% peak efficiency preserves battery life over multi-hour playback; 0.3 µA shutdown current enables months of shelf life. |
Use Scenario: Providing regulated 1.85 V to ultra-low-power ARM Cortex-M0+ MCU and optical heart-rate sensor. IC Role / Device Role / Timing Role: Always-on system power rail with automatic PFM entry during sleep intervals. Use Value: 36 µA quiescent current enables >1-year battery life on CR2032; WLCSP fits <8 mm × 8 mm PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.8 V output; 3.6 MHz switching; 400 mA max load; 6-pin WSON package (1.5 × 1.5 mm). | Larger footprint; lower max current; lacks auto mode-requires external mode control for light-load optimization. | Select when board space allows larger package and 1.8 V (not 1.85 V) suffices for target SoC I/O voltage. |
| MAX8640YETA+ | Fixed 1.85 V output; 2.25 MHz switching; 600 mA max load; 6-bump WLP (1.37 × 1.37 mm). | Lower frequency increases inductor size; higher θJA (130°C/W) limits power density in compact layouts. | Select when cost sensitivity outweighs size constraints and 2.25 MHz operation is acceptable for EMI filtering. |
Compared with TPS62231DRYR and MAX8640YETA+, ADP2121ACBZ-1.85R7 delivers identical 1.85 V output and 600 mA capability in the smallest footprint (1.17 mm²), with integrated auto mode and lowest quiescent current-making it optimal for next-gen wearables and miniaturized IoT endpoints.
Availability
ADP2121ACBZ-1.85R7 is available at Aetrix Electronics and suitable for mobile phones, digital cameras, portable audio devices, and wearable health monitors requiring stable component supply and long-term lifecycle support.
Supply support for ADP2121ACBZ-1.85R7 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, headquartered in Norwood, MA.
The ADP2121 series was designed specifically for space- and battery-constrained portable electronics, emphasizing ultra-small packaging, sub-µA shutdown, and seamless PFM/PWM transition without external components.
FAQ
What is the exact output voltage tolerance of ADP2121ACBZ-1.85R7?
The ADP2121ACBZ-1.85R7 has a guaranteed output voltage accuracy of ±3% over temperature (−40°C to +125°C junction), line, and load conditions. This specification applies in both auto and PWM modes, with no external resistors required since the 1.85 V reference is factory-trimmed and internal to ADP2121ACBZ-1.85R7.
Can ADP2121ACBZ-1.85R7 operate from a single 2.5 V alkaline cell?
Yes-ADP2121ACBZ-1.85R7 supports input voltages as low as 2.3 V, making it fully operational across the discharge curve of a fresh 2.5 V alkaline cell. At VIN = 2.5 V, it delivers up to 500 mA continuous output current, confirmed in the datasheet's maximum output current table for ADP2121ACBZ-1.85R7.
Does ADP2121ACBZ-1.85R7 require external compensation components?
No-ADP2121ACBZ-1.85R7 features fully internal compensation. Its control loop is factory-tuned to remain stable with standard 0.47 µH inductors and 4.7 µF output capacitors, eliminating external RC networks and reducing bill-of-materials count for ADP2121ACBZ-1.85R7 designs.
How does the MODE pin affect ADP2121ACBZ-1.85R7 efficiency at light loads?
When MODE is pulled low, ADP2121ACBZ-1.85R7 enters auto mode and switches to PFM at light loads (<70–170 mA, depending on VIN), reducing quiescent current to 36 µA and improving light-load efficiency by up to 25 percentage points versus forced PWM mode-directly extending battery runtime in ADP2121ACBZ-1.85R7-powered devices.
What thermal performance can be expected from ADP2121ACBZ-1.85R7 on a 2-layer PCB?
On a standard 2-layer PCB, ADP2121ACBZ-1.85R7 has a junction-to-ambient thermal resistance (θJA) of 198°C/W. At 600 mA output and 3.6 V input, power dissipation is ~180 mW; thus, junction temperature rise is ~36°C above ambient-well within the −40°C to +125°C operating range for ADP2121ACBZ-1.85R7.
ADP2121ACBZ-1.85R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFBGA, WLCSP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.85V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (0.9x1.3)
ADP2121ACBZ-1.85R7 FAQ
1.How can I place an order for ADP2121ACBZ-1.85R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2121ACBZ-1.85R7 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 ADP2121ACBZ-1.85R7 reliable?
The price and inventory of ADP2121ACBZ-1.85R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP2121ACBZ-1.85R7 is usually 5 days.
3.What payment methods are accepted for ADP2121ACBZ-1.85R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2121ACBZ-1.85R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2121ACBZ-1.85R7?
ADP2121ACBZ-1.85R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2121ACBZ-1.85R7 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 ADP2121ACBZ-1.85R7?
For technical support, including ADP2121ACBZ-1.85R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2121ACBZ-1.85R7 requirements.
6.How does Aetrix verify that ADP2121ACBZ-1.85R7 is sourced from the original manufacturer or authorized distributors?
All ADP2121ACBZ-1.85R7 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 ADP2121ACBZ-1.85R7 meets industry standards.
7.What is the process for return or replacement of ADP2121ACBZ-1.85R7?
All ADP2121ACBZ-1.85R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP2121ACBZ-1.85R7, 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 ADP2121ACBZ-1.85R7 part is unused and in its original packaging.
Return procedure for ADP2121ACBZ-1.85R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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