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Analog Devices Inc. ADP2121ACBZ-1875R7
- Part No.:
- ADP2121ACBZ-1875R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFBGA, WLCSP
- Datasheet:
-
ADP2121ACBZ-1875R7.pdf
- Description:
- IC REG BUCK 1.875V 600MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
ADP2121ACBZ-1875R7 from Analog Devices is a 6 MHz synchronous step-down DC-DC converter delivering up to 600 mA output current with fixed 1.875 V output, operating from 2.3 V to 5.5 V input, and achieving 92% peak efficiency - optimized for space-constrained portable power rails in digital audio and mobile phone baseband ICs.
For engineers reviewing the ADP2121ACBZ-1875R7 datasheet, ADP2121ACBZ-1875R7 pinout, ADP2121ACBZ-1875R7 application, or ADP2121ACBZ-1875R7 equivalent, key selection criteria include ultrasmall 6-ball WLCSP footprint, auto/PWM mode control via MODE pin, internal compensation, soft-start timing (75–85 µs), and output short-circuit/thermal protection.
Technical Context
The ADP2121ACBZ-1875R7 implements a hybrid voltage-mode PWM controller with integrated PFM auto-mode transition logic, enabling seamless switching between 6 MHz constant-frequency operation under load and variable-frequency pulse-skipping at light loads. Its internal synchronous rectifier eliminates external Schottky losses.
It features cycle-by-cycle current limiting (790–1222 mA), undervoltage lockout (2.1–2.3 V rising threshold), and thermal shutdown (150°C) with 15°C hysteresis - all implemented within a single-die solution requiring only one inductor (0.47 µH), input (2.2 µF), and output (4.7 µF) capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.875 V ±3% - eliminates external feedback resistor network and ensures stable core supply for low-voltage DSPs and RF transceivers. |
| Input Voltage Range | 2.3 V to 5.5 V - supports single-cell Li+/Li− polymer, 3× alkaline/Ni-MH, and USB-powered systems without input pre-regulation. |
| Max Output Current | 600 mA at VIN ≥ 2.7 V - sufficient for powering ARM Cortex-M4/M7 cores, image sensors, or audio codecs in handheld devices. |
| Switching Frequency | 6 MHz (5.36–6.64 MHz) - enables use of 0402-size 0.47 µH multilayer inductors and reduces output ripple without increasing ESR requirements. |
| Quiescent Current | 36 µA typical in auto mode - extends battery runtime in standby states for always-on audio subsystems and sensor hubs. |
| Shutdown Current | 0.3 µA typical - minimizes leakage when system is powered off, critical for long-term storage and low-power wake-up architectures. |
| Package | 6-ball, 0.4 mm pitch, 1.17 mm² WLCSP - matches PCB area constraints of ultra-thin smartphones and wearables; requires microvia-compatible layout. |
Pinout & Package
ADP2121ACBZ-1875R7 uses an ultrasmall 6-ball Wafer-Level Chip Scale Package (WLCSP) with 0.4 mm ball pitch and 1.17 mm² footprint. The package is bottom-side bumped and requires reflow-compatible PCB pad design per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | MODE | Logic-selectable operating mode: low = auto (PFM/PWM), high = forced PWM; must be actively driven - not floating. |
| B1 | SW | Switch node connecting internal P-channel high-side and N-channel synchronous rectifier FETs; connects to inductor and diode-free path. |
| C1 | FB | Feedback input tied internally to 1.875 V reference; no external resistors required - simplifies layout and improves regulation accuracy. |
| A2 | VIN | Main power input (2.3–5.5 V); requires local 2.2 µF X5R ceramic capacitor placed adjacent to ball for high-frequency decoupling. |
| B2 | EN | Enable logic input: ≥1.3 V = active, ≤0.4 V = shutdown; draws <1 µA leakage and disconnects input from output in shutdown. |
| C2 | GND | Power ground return for both input and output paths; must be connected to solid ground plane beneath package for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Eliminates external Schottky diode, reducing conduction loss and improving full-load efficiency to 92% at 600 mA. |
| Auto Mode with PFM/PWM Transition | Dynamically switches between high-efficiency pulse-frequency modulation (light load) and stable 6 MHz PWM (medium/heavy load) - no external control needed. |
| Internal Compensation | Removes need for external RC network, reducing BOM count and PCB area while maintaining phase margin >45° across 10–600 mA load range. |
| Output Short-Circuit Protection | Active clamp limits SW node voltage during GND fault, preventing damage to inductor and IC while allowing safe recovery after fault removal. |
| Thermal Shutdown with Hysteresis | Shuts down at 150°C junction temperature and restarts only after cooling to 135°C - prevents thermal runaway in sealed enclosures. |
Applications
| Mobile Baseband Power | Digital Audio Codec Supply |
|---|---|
|
Use Scenario: Powers ARM-based application processors and cellular modem baseband ICs in smartphones with tight thermal and area budgets. IC Role / Device Role / Timing Role: Primary 1.875 V core rail regulator delivering up to 600 mA with fast transient response to CPU burst loads. Use Value: 6 MHz switching enables sub-1 mm² total solution size and maintains <±20 mV output deviation during 0→300 mA load steps. |
Use Scenario: Supplies clean, low-noise 1.875 V bias to stereo audio DACs/ADCs and Class-D amplifiers in portable speakers and headphones. IC Role / Device Role / Timing Role: Low-quiescent-current buck converter operating in auto mode during playback pause and PWM mode during active audio streaming. Use Value: 36 µA quiescent current extends battery life in always-on voice assistant modes; internal soft start prevents pop/click artifacts at power-up. |
| Wearable Sensor Hub | IoT Edge Node MCU Core Rail |
|
Use Scenario: Powers multi-sensor fusion hubs (accelerometer, gyroscope, HRM) in fitness trackers where board space is limited to <100 mm². IC Role / Device Role / Timing Role: Compact, fully integrated step-down regulator with no external feedback components - simplifies routing on 2-layer flex PCBs. Use Value: 1.17 mm² WLCSP footprint fits within sensor module footprint; UVLO prevents brownout resets during battery discharge below 2.3 V. |
Use Scenario: Provides regulated 1.875 V core voltage to ultra-low-power MCUs (e.g., Nordic nRF52840, Silicon Labs EFM32) in battery-operated IoT nodes. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter supporting duty-cycled operation with deep-sleep current as low as 0.3 µA in shutdown. Use Value: Auto mode extends 200 mAh coin cell lifetime beyond 12 months in sensor-read-every-60-seconds applications. |
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 DCS-Control™ frequency, 600 mA rating, 6-pin WSON package (2.0 × 2.0 mm). | Larger footprint (4× area), higher minimum input (2.95 V), no PFM auto mode - suited for industrial-grade stability over battery life. | Select when board space allows larger package and input voltage exceeds 2.95 V; avoid for single-cell Li+ systems below 3.0 V. |
| RT8059GJ6 | Adjustable output (0.6–5.5 V), 2.5 MHz, 600 mA, 6-pin WLCSP (1.17 mm²), but requires external feedback resistors. | Greater flexibility in output voltage tuning at cost of added components and layout complexity; lower peak efficiency (90% vs. 92%). | Choose when system requires multiple output voltages from same platform; not recommended if fixed 1.875 V suffices and BOM minimization is critical. |
Compared with TPS62231DRYR and RT8059GJ6, ADP2121ACBZ-1875R7 delivers superior battery life in single-cell Li+ systems due to its 2.3 V minimum input, 36 µA quiescent current, and true auto-mode PFM/PWM transition - all within identical 1.17 mm² WLCSP area.
Availability
ADP2121ACBZ-1875R7 is available at Aetrix Electronics and suitable for mobile baseband power, digital audio codec supply, wearable sensor hub, and IoT edge node MCU core rail applications requiring stable component supply, consistent WLCSP packaging, and guaranteed 600 mA output capability across temperature.
Supply support for ADP2121ACBZ-1875R7 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, with design centers worldwide and ISO 9001-certified manufacturing.
The ADP2121 series was designed specifically for ultra-portable battery-powered devices demanding minimal PCB area, longest runtime, and robust protection - targeting mobile, audio, and wearable markets where efficiency and integration are non-negotiable.
FAQ
What is the exact output voltage tolerance of the ADP2121ACBZ-1875R7?
The ADP2121ACBZ-1875R7 provides a fixed 1.875 V output with ±3% accuracy over temperature (−40°C to +125°C junction) and line/load conditions. This specification applies in both auto and PWM modes and is measured at TA = 25°C with no load and VIN = 3.6 V. The ADP2121ACBZ-1875R7 does not require external resistors to set this voltage, ensuring consistent regulation without calibration drift.
Can the ADP2121ACBZ-1875R7 operate from a single 2.5 V lithium coin cell?
No - the ADP2121ACBZ-1875R7 requires a minimum input voltage of 2.3 V, but its maximum guaranteed 600 mA output current begins only at VIN ≥ 2.7 V. At VIN = 2.5 V, the ADP2121ACBZ-1875R7 supports up to 500 mA (per Table 2). For reliable 600 mA delivery, VIN must be maintained at or above 2.7 V, making it compatible with fresh Li+ cells (3.0–4.2 V) but not depleted coin cells below 2.7 V.
How does the MODE pin affect efficiency in the ADP2121ACBZ-1875R7?
When MODE is pulled low, the ADP2121ACBZ-1875R7 enters auto mode and transitions between PFM (light load) and PWM (≥70–170 mA, depending on VIN) to maximize efficiency across the full load range - achieving 92% peak and >80% at 1 mA. When MODE is high, the ADP2121ACBZ-1875R7 remains in forced PWM mode at 6 MHz, sacrificing light-load efficiency (e.g., ~40% at 1 mA) for tighter output regulation and predictable EMI profile.
What is the recommended inductor value and type for the ADP2121ACBZ-1875R7?
Analog Devices specifies a 0.47 µH shielded multilayer ceramic inductor (e.g., TDK LQM2HPNR47MG0L or Murata LQH3NPNR47MG0L) rated for ≥1.8 A saturation current. This value balances size, efficiency, and transient response for the ADP2121ACBZ-1875R7's 6 MHz switching frequency. Inductor DCR must be ≤80 mΩ to maintain output accuracy and thermal performance under 600 mA load.
Does the ADP2121ACBZ-1875R7 require external compensation components?
No - the ADP2121ACBZ-1875R7 integrates full Type-II compensation circuitry, eliminating the need for external capacitors or resistors in the feedback loop. This reduces solution size, improves reliability, and guarantees stability across all qualified input/output conditions and load ranges without user tuning. The ADP2121ACBZ-1875R7 achieves >45° phase margin with the standard 2.2 µF CIN and 4.7 µF COUT configuration.
ADP2121ACBZ-1875R7 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):
- 1.875V
- 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-1875R7 FAQ
1.How can I place an order for ADP2121ACBZ-1875R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2121ACBZ-1875R7 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-1875R7 reliable?
The price and inventory of ADP2121ACBZ-1875R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP2121ACBZ-1875R7 is usually 5 days.
3.What payment methods are accepted for ADP2121ACBZ-1875R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2121ACBZ-1875R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2121ACBZ-1875R7?
ADP2121ACBZ-1875R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2121ACBZ-1875R7 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-1875R7?
For technical support, including ADP2121ACBZ-1875R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2121ACBZ-1875R7 requirements.
6.How does Aetrix verify that ADP2121ACBZ-1875R7 is sourced from the original manufacturer or authorized distributors?
All ADP2121ACBZ-1875R7 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-1875R7 meets industry standards.
7.What is the process for return or replacement of ADP2121ACBZ-1875R7?
All ADP2121ACBZ-1875R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP2121ACBZ-1875R7, 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-1875R7 part is unused and in its original packaging.
Return procedure for ADP2121ACBZ-1875R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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