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Analog Devices Inc. ADP2138ACBZ-1.8-R7
- Part No.:
- ADP2138ACBZ-1.8-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
ADP2138ACBZ-1.8-R7.pdf
- Description:
- IC REG BUCK 1.8V 800MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:8,032
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Product details
Overview
ADP2138ACBZ-1.8-R7 from Analog Devices is a compact, synchronous step-down DC-to-DC converter delivering up to 800 mA output at fixed 1.8 V with 3 MHz switching frequency, 95% peak efficiency, and 23 μA typical quiescent current. It operates from 2.3 V to 5.5 V input-ideal for single-cell Li-ion or USB-powered portable electronics requiring stable low-voltage rail generation.
For engineers reviewing the ADP2138ACBZ-1.8-R7 datasheet, ADP2138ACBZ-1.8-R7 pinout, ADP2138ACBZ-1.8-R7 application, or ADP2138ACBZ-1.8-R7 equivalent, key selection factors include its 6-ball WLCSP package size, forced PWM/automatic PSM mode control via MODE pin, 100% duty-cycle low-dropout operation, and integrated soft start, compensation, and protection features.
Technical Context
The ADP2138ACBZ-1.8-R7 employs a fixed-frequency, current-mode PWM architecture optimized for high-speed transient response and light-load efficiency. Its 3 MHz oscillator enables use of sub-1 μH inductors and <10 μF ceramic capacitors, minimizing solution footprint.
It supports dual operating modes: forced PWM (low ripple, noise-sensitive loads) and automatic PWM/PSM (improved light-load efficiency below 100 mA threshold). Internal synchronous rectification, undervoltage lockout (2.15 V), thermal shutdown (150°C), and short-circuit protection with frequency foldback ensure robust system-level reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% - eliminates external feedback resistors and ensures precision rail for core logic or memory I/O. |
| Max Output Current | 800 mA - sustains full load across entire 2.3–5.5 V input range, supporting demanding portable SoCs. |
| Switching Frequency | 3.0 MHz (2.6–3.4 MHz) - enables ultra-small passive components and reduces EMI fundamental frequency. |
| Quiescent Current | 23 μA typical - extends battery life in always-on subsystems like real-time clocks or sensor hubs. |
| Shutdown Current | 0.2 μA typical - minimizes leakage during deep sleep, critical for multi-week standby in wearables. |
| Input Voltage Range | 2.3 V to 5.5 V - compatible with single Li+/Li-poly, USB 2.0/3.0, and multi-cell alkaline/NiMH sources. |
| Efficiency (Peak) | 95% - reduces thermal load in space-constrained PCBs and improves power budget margin. |
Pinout & Package
ADP2138ACBZ-1.8-R7 uses a 6-ball, 1 mm × 1.5 mm wafer-level chip-scale package (WLCSP) with 0.5 mm pitch, optimized for minimal board area and thermal performance (θJA = 170°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Bypassed with ≥4.7 µF capacitor; supplies PFET switch and sets UVLO activation at 2.15 V. |
| SW | Switch Node | Drain of internal PFET and NFET; connects to inductor and LC filter output stage. |
| GND | Ground Reference | Common return for input/output capacitors and internal regulator circuitry. |
| EN | Enable Control | Logic-high activates converter with soft-start; logic-low disables output and reduces supply current to 0.2 μA. |
| MODE | Operating Mode Select | High = forced PWM (low ripple); low = automatic PWM/PSM (efficiency-optimized below 100 mA). |
| VOUT | Feedback Sense | Internal 1.8 V reference connection; no external resistor divider required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates external Schottky diode, reducing conduction loss and improving efficiency by ~5–8% vs. asynchronous designs. |
| 100% Duty-Cycle Operation | Maintains regulation down to VIN ≈ VOUT, enabling operation near battery end-of-discharge without rail collapse. |
| Fast Load Transient Response | Settles within 10 µs for 150 mA → 500 mA steps (VOUT = 1.8 V), preserving signal integrity in burst-mode processors. |
| Internal Compensation & Soft Start | Reduces external component count to only 3: input cap, output cap, and inductor; soft start limits inrush current to protect weak sources. |
| Thermal & Short-Circuit Protection | Shuts down at 150°C junction temperature with 20°C hysteresis; folds switching frequency during hard shorts to limit fault current. |
Applications
| Smartphone Application Processor Core Rail | Wireless Headset Audio Codec Power |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring tightly regulated 1.8 V at up to 800 mA during burst activity. IC Role / Device Role / Timing Role: Primary buck regulator supplying core voltage domain with fast transient response and low-noise PWM mode. Use Value: Maintains stable VDD during rapid DVFS transitions; 95% efficiency minimizes heat under sustained load in sealed enclosure. | Use Scenario: Supplies clean 1.8 V bias to stereo audio DAC/ADC in Bluetooth earbuds with tight battery life constraints. IC Role / Device Role / Timing Role: Low-quiescent-current step-down converter operating in PSM mode during idle, switching to PWM during playback. Use Value: 23 μA IQ extends 100-mAh battery runtime by >12 hours in standby; 3 MHz switching avoids audible beat frequencies. |
| Digital Camera Image Sensor Interface | GPS Navigation Module I/O Rail |
Use Scenario: Provides 1.8 V I/O supply for CMOS image sensor interface (MIPI CSI-2) in compact action cameras. IC Role / Device Role / Timing Role: Noise-sensitive power rail where switching ripple must remain below 10 mVpp to prevent image banding. Use Value: Forced PWM mode delivers <5 mVpp ripple at 200 mA; 6-ball WLCSP fits within 2.5 mm² camera module footprint. | Use Scenario: Generates 1.8 V for GPS baseband processor and RF front-end digital I/O in automotive-grade navigation units. IC Role / Device Role / Timing Role: Automotive-qualified (−40°C to +85°C ambient) DC-DC converter with UVLO and thermal shutdown for harsh environments. Use Value: 2.3 V UVLO prevents deep discharge of 3.7 V Li-ion packs; 150°C thermal shutdown protects against engine-bay thermal runaway. |
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, 800 mA, 3.6 MHz, 22 μA IQ, 6-pin WSON (2 mm × 2 mm) | Larger package (4× area), higher fSW increases EMI filtering complexity | Preferred when board layout allows larger footprint and higher-frequency EMI mitigation is feasible. |
| RT8059GJ6 | Fixed 1.8 V, 600 mA, 3 MHz, 25 μA IQ, 6-pin WLCSP (1.0 mm × 1.5 mm) | Lower max current (600 mA), no PSM mode, no 100% duty-cycle support | Suitable for cost-sensitive designs with ≤600 mA loads and no deep-discharge operation requirement. |
Compared with TPS62231DRYR and RT8059GJ6, the ADP2138ACBZ-1.8-R7 uniquely combines 800 mA capability, true 100% duty-cycle operation, and automatic PWM/PSM mode in the smallest WLCSP footprint-making it optimal for next-gen ultra-compact battery-powered systems where size, efficiency, and dropout behavior are co-constrained.
Availability
ADP2138ACBZ-1.8-R7 is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor hubs, and portable medical devices requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for ADP2138ACBZ-1.8-R7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The ADP2138 product line delivers ultra-compact, high-efficiency DC-DC converters for space- and power-constrained portable electronics, emphasizing minimal external component count and robust protection for battery-operated systems.
FAQ
What is the maximum output current capability of the ADP2138ACBZ-1.8-R7 across its input voltage range?
The ADP2138ACBZ-1.8-R7 delivers up to 800 mA continuous output current across its full 2.3 V to 5.5 V input range, verified per datasheet Table 1 under TJ = −40°C to +125°C conditions. This rating holds regardless of input voltage, enabling consistent performance from fresh to depleted Li-ion cells. The ADP2138ACBZ-1.8-R7 maintains regulation using 100% duty-cycle operation when VIN approaches VOUT.
Does the ADP2138ACBZ-1.8-R7 require external compensation components?
No, the ADP2138ACBZ-1.8-R7 features fully internal compensation, eliminating the need for external RC networks. This simplifies design, reduces bill-of-materials cost, and ensures stability across all recommended inductor and capacitor combinations. The internal compensation is optimized for the 3 MHz switching frequency and standard 1–3 μH inductors specified in the datasheet.
How does the MODE pin affect the operation of the ADP2138ACBZ-1.8-R7?
The MODE pin selects between two distinct operating modes: logic-high forces continuous PWM operation (low output ripple, ideal for noise-sensitive analog circuits), while logic-low enables automatic PWM/PSM mode that switches to power-save mode below 100 mA load to reduce quiescent current to 23 μA. This dual-mode flexibility allows designers to optimize for either noise performance or battery life depending on system state.
What protection features are integrated into the ADP2138ACBZ-1.8-R7?
The ADP2138ACBZ-1.8-R7 integrates undervoltage lockout (2.15 V threshold), thermal shutdown (150°C with 20°C hysteresis), short-circuit protection with frequency foldback, overcurrent limiting (1100–1650 mA PFET peak), and soft-start. These features operate autonomously without external circuitry, ensuring safe startup, fault recovery, and long-term reliability in unattended portable applications.
Is the ADP2138ACBZ-1.8-R7 pin-compatible with other members of the ADP2138/ADP2139 family?
Yes, all ADP2138 and ADP2139 variants-including ADP2138ACBZ-1.8-R7-share identical 6-ball WLCSP pinout and package dimensions. However, the ADP2139 includes an integrated output discharge switch (100 Ω) not present in the ADP2138, so direct substitution requires verification of discharge functionality requirements in the target application.
ADP2138ACBZ-1.8-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 800mA
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLCSP (1.03x1.50)
ADP2138ACBZ-1.8-R7 FAQ
1.How can I place an order for ADP2138ACBZ-1.8-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2138ACBZ-1.8-R7 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 ADP2138ACBZ-1.8-R7 reliable?
The price and inventory of ADP2138ACBZ-1.8-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP2138ACBZ-1.8-R7 is usually 5 days.
3.What payment methods are accepted for ADP2138ACBZ-1.8-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2138ACBZ-1.8-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2138ACBZ-1.8-R7?
ADP2138ACBZ-1.8-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2138ACBZ-1.8-R7 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 ADP2138ACBZ-1.8-R7?
For technical support, including ADP2138ACBZ-1.8-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2138ACBZ-1.8-R7 requirements.
6.How does Aetrix verify that ADP2138ACBZ-1.8-R7 is sourced from the original manufacturer or authorized distributors?
All ADP2138ACBZ-1.8-R7 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 ADP2138ACBZ-1.8-R7 meets industry standards.
7.What is the process for return or replacement of ADP2138ACBZ-1.8-R7?
All ADP2138ACBZ-1.8-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP2138ACBZ-1.8-R7, 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 ADP2138ACBZ-1.8-R7 part is unused and in its original packaging.
Return procedure for ADP2138ACBZ-1.8-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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