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Analog Devices Inc. ADP2138ACBZ-1.0-R7
- Part No.:
- ADP2138ACBZ-1.0-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
ADP2138ACBZ-1.0-R7.pdf
- Description:
- IC REG BUCK 1V 800MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:8,836
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Product details
Overview
ADP2138ACBZ-1.0-R7 from Analog Devices is a compact, synchronous step-down DC-to-DC converter delivering up to 800 mA output at fixed 1.0 V with 3 MHz switching frequency, 2.3 V–5.5 V input range, and 95% peak efficiency. It serves as a primary power rail for low-voltage digital cores in portable battery-powered systems.
For engineers reviewing the ADP2138ACBZ-1.0-R7 datasheet, ADP2138ACBZ-1.0-R7 pinout, ADP2138ACBZ-1.0-R7 application, or ADP2138ACBZ-1.0-R7 equivalent, key selection criteria include its 1.0 V fixed output, 6-ball WLCSP package, forced PWM/automatic PSM mode control, ultralow 0.2 μA shutdown current, and integrated soft start and thermal protection.
Technical Context
The ADP2138ACBZ-1.0-R7 employs a fixed-frequency, current-mode PWM architecture operating at 3 MHz (2.6–3.4 MHz over conditions), enabling small external LC components. Its MODE pin selects between continuous PWM (low ripple) and automatic PWM/PSM (high light-load efficiency), with PSM entry threshold at 100 mA.
It integrates PFET/NFET synchronous switches (155 mΩ/115 mΩ typical RDS(ON)), internal compensation, 100% duty-cycle low-dropout operation, and protections including undervoltage lockout (2.15 V falling threshold), thermal shutdown (150°C), and current limiting (1100–1650 mA peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.0 V ±2% - eliminates external feedback resistors and ensures stable core supply for 1.0 V logic domains. |
| Input Voltage Range | 2.3 V to 5.5 V - supports single Li+/Li-Po cells, USB, PCMCIA, and multi-cell alkaline/NiMH sources. |
| Max Output Current | 800 mA - sufficient for powering ARM Cortex-M cores, FPGA I/O banks, or DSP subsystems without external boost. |
| Switching Frequency | 3.0 MHz (2.6–3.4 MHz) - enables use of sub-2.2 µH inductors and 0603-size 4.7 µF ceramic capacitors for ultra-compact layouts. |
| Quiescent Current | 23 µA typical - minimizes battery drain during standby in always-on sensor nodes or wearable controllers. |
| Shutdown Current | 0.2 µA typical - preserves battery charge over extended storage or deep-sleep intervals in portable medical devices. |
| Efficiency | 95% peak - reduces thermal load in sealed enclosures and extends runtime in energy-constrained handhelds. |
Pinout & Package
ADP2138ACBZ-1.0-R7 uses a 6-ball, 1 mm × 1.5 mm wafer-level chip-scale package (WLCSP) with 0.5 mm ball pitch, optimized for minimal PCB footprint and thermal performance on 4-layer boards (θJA = 170°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Bypassed with ≥4.7 µF capacitor; supplies PFET high-side switch and internal circuitry - must be placed adjacent to IC for low-impedance path. |
| SW | Switch node | Drain connection of integrated PFET and NFET; connects directly to inductor - critical high-dI/dt node requiring short, wide trace and ground plane clearance. |
| GND | Ground reference | Common return for input/output capacitors and internal regulator - requires low-inductance connection to PCB ground plane. |
| EN | Enable control | Logic-level input (1.2 V high threshold); asserts soft-start on rising edge and disconnects VIN from VOUT in shutdown. |
| MODE | Operating mode select | High = forced PWM (low ripple, constant frequency); low = automatic PWM/PSM (efficiency-optimized at light loads). |
| VOUT | Feedback sense | Monitors regulated output voltage; internally connected to fixed 1.0 V reference - no external resistor divider required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and board area while enabling >90% efficiency at 100–800 mA loads. |
| Internal soft start | Ramps output voltage linearly at startup to limit inrush current - prevents brownout on weak batteries or shared power rails. |
| 100% duty-cycle operation | Maintains regulation down to VIN ≈ VOUT + dropout; avoids output collapse during battery sag or high-current transients. |
| Fast transient response | Settles within <10 µs after 150 mA → 500 mA load steps (VOUT = 1.0 V) - stabilizes voltage for burst-mode processors and RF modems. |
| Thermal & current protection | Auto-recovering thermal shutdown (150°C trip, 130°C release) and cycle-by-cycle current limiting prevent damage during overload or poor heatsinking. |
Applications
| Mobile Baseband Processors | Digital Camera Image Sensors |
|---|---|
Use Scenario: Powering ARM-based application processors in smartphones and feature phones requiring tightly regulated 1.0 V core voltage. IC Role / Device Role / Timing Role: Primary buck regulator supplying CPU/GPU core domain with fast dynamic voltage scaling support via MODE pin control. Use Value: 3 MHz switching enables <1 µH inductors and 0603 capacitors, reducing solution size by >40% vs. 1 MHz converters while maintaining <2% output accuracy. | Use Scenario: Delivering clean, low-noise 1.0 V bias to CMOS image sensor analog front-end and ADC reference circuits. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source with forced PWM mode selected to suppress switching noise near sensitive analog pixel arrays. Use Value: 95% peak efficiency and 23 µA quiescent current extend battery life in compact point-and-shoot cameras without compromising image SNR. |
| Portable GPS Navigation Units | Wireless Headset SoCs |
Use Scenario: Supplying 1.0 V to GNSS baseband ICs and RF front-end LDOs in battery-operated automotive and outdoor navigation devices. IC Role / Device Role / Timing Role: Main system regulator supporting cold-start operation from partially discharged Li-ion cells (down to 2.3 V VIN). Use Value: Undervoltage lockout (2.15 V) prevents deep battery discharge, while 100% duty-cycle mode sustains GPS lock during engine cranking voltage dips. | Use Scenario: Providing regulated 1.0 V to Bluetooth LE audio SoCs in true wireless stereo earbuds with space-constrained PCBs. IC Role / Device Role / Timing Role: Compact, high-efficiency power stage enabling dual-core DSP and codec operation within 12 mm² total board area. Use Value: 6-ball WLCSP package (1.0 × 1.5 mm) and 0.2 µA shutdown current allow >120-hour standby time and seamless fit into miniaturized earbud cavities. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRYR | Fixed 1.0 V output, 3 MHz, 800 mA, 6-pin WSON (2 × 2 mm) - larger footprint, higher 3.5 µA quiescent current. | Less suitable for ultra-compact designs; better thermal margin in high-ambient environments due to larger pad area. | Choose when PCB layout allows 2 × 2 mm package and higher light-load IQ is acceptable. |
| Maxim Integrated MAX8640YETA+T | Fixed 1.0 V, 3 MHz, 800 mA, 6-bump WLP (1.2 × 1.6 mm) - slightly larger than ADP2138ACBZ-1.0-R7, 1.5 µA shutdown current. | Lower shutdown current than TPS62231 but still 7.5× higher than ADP2138ACBZ-1.0-R7's 0.2 µA - impacts long-term storage leakage. | Prefer for legacy Maxim-design ecosystems where pin compatibility with existing MAX864x footprints is required. |
Compared with TPS62231DRYR and MAX8640YETA+T, ADP2138ACBZ-1.0-R7 offers the smallest package (1.0 × 1.5 mm), lowest shutdown current (0.2 µA), and highest peak efficiency (95%), making it optimal for space- and battery-life-critical portable electronics where minimal BOM count and thermal footprint are essential.
Availability
ADP2138ACBZ-1.0-R7 is available at Aetrix Electronics and suitable for mobile baseband processors, digital camera image sensors, portable GPS navigation units, wireless headset SoCs, and other compact battery-powered applications requiring stable component supply and long-term manufacturability.
Supply support for ADP2138ACBZ-1.0-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 precision instrumentation, industrial automation, communications, and healthcare markets.
The ADP2138 series belongs to Analog Devices' high-frequency, low-quiescent-current DC-DC converter product line, engineered specifically for space-constrained, battery-operated portable electronics demanding ultra-small solutions and exceptional light-load efficiency.
FAQ
What is the output voltage tolerance of the ADP2138ACBZ-1.0-R7 under full load and temperature range?
The ADP2138ACBZ-1.0-R7 guarantees ±2% output voltage accuracy across all operating conditions - including 0–800 mA load, −40°C to +125°C junction temperature, and 2.3–5.5 V input - as specified in Table 1 of the Rev. E datasheet. This tight tolerance ensures reliable operation of 1.0 V logic cores without external trimming or calibration.
Does the ADP2138ACBZ-1.0-R7 require external compensation components?
No, the ADP2138ACBZ-1.0-R7 features fully internal compensation, eliminating the need for external RC networks or type-II/type-III compensators. This simplifies design, reduces bill-of-materials count, and improves stability across varying output capacitor ESR and capacitance values - confirmed in the General Description and Theory of Operation sections.
Can the ADP2138ACBZ-1.0-R7 operate with a 2.3 V input and still deliver 800 mA at 1.0 V?
Yes - the ADP2138ACBZ-1.0-R7 maintains full 800 mA output capability across its entire 2.3 V–5.5 V input range, including at minimum VIN. Its 100% duty-cycle low-dropout mode ensures regulation even when VIN approaches VOUT, as validated in the Absolute Maximum Ratings and Typical Performance Characteristics (Figures 3–8).
What is the recommended input capacitor for the ADP2138ACBZ-1.0-R7, and why is placement critical?
Analog Devices recommends a minimum 4.7 µF X5R/X7R ceramic capacitor (e.g., Murata GRM188R60J475) placed as close as possible to the VIN and GND pins. Proximity minimizes high-frequency loop inductance, preventing input voltage spikes and ensuring stable operation during fast load transients - detailed in Applications Information and PCB Layout Guidelines.
How does the MODE pin affect efficiency and output ripple in the ADP2138ACBZ-1.0-R7?
When MODE = high, ADP2138ACBZ-1.0-R7 operates in forced PWM mode: constant 3 MHz switching yields low peak-to-peak ripple (<10 mV typical) but lower light-load efficiency. When MODE = low, it auto-switches to PSM below 100 mA, boosting light-load efficiency (>85% at 1 mA) at the cost of higher ripple - a trade-off documented in Figures 3–8 and the Control Scheme section.
ADP2138ACBZ-1.0-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):
- 1V
- 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-1.0-R7 FAQ
1.How can I place an order for ADP2138ACBZ-1.0-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2138ACBZ-1.0-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-1.0-R7 reliable?
The price and inventory of ADP2138ACBZ-1.0-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-1.0-R7 is usually 5 days.
3.What payment methods are accepted for ADP2138ACBZ-1.0-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2138ACBZ-1.0-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2138ACBZ-1.0-R7?
ADP2138ACBZ-1.0-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2138ACBZ-1.0-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-1.0-R7?
For technical support, including ADP2138ACBZ-1.0-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2138ACBZ-1.0-R7 requirements.
6.How does Aetrix verify that ADP2138ACBZ-1.0-R7 is sourced from the original manufacturer or authorized distributors?
All ADP2138ACBZ-1.0-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-1.0-R7 meets industry standards.
7.What is the process for return or replacement of ADP2138ACBZ-1.0-R7?
All ADP2138ACBZ-1.0-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP2138ACBZ-1.0-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-1.0-R7 part is unused and in its original packaging.
Return procedure for ADP2138ACBZ-1.0-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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