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Analog Devices Inc. ADP2138ACBZ-3.3-R7
- Part No.:
- ADP2138ACBZ-3.3-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-UFBGA, WLCSP
- Datasheet:
-
ADP2138ACBZ-3.3-R7.pdf
- Description:
- IC REG BUCK 3.3V 800MA 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,717
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Product details
Overview
ADP2138ACBZ-3.3-R7 from Analog Devices is a synchronous step-down DC-to-DC converter delivering up to 800 mA output at fixed 3.3 V, operating from 2.3 V to 5.5 V input, with 3 MHz fixed-frequency PWM mode, 95% peak efficiency, and 23 μA typical quiescent current - designed for power rail regulation in space-constrained portable electronics.
For engineers reviewing the ADP2138ACBZ-3.3-R7 datasheet, ADP2138ACBZ-3.3-R7 pinout, ADP2138ACBZ-3.3-R7 application, or ADP2138ACBZ-3.3-R7 equivalent, key selection considerations include its 6-ball WLCSP package size (1 mm × 1.5 mm), forced PWM/automatic PSM mode control via MODE pin, 100% duty-cycle low-dropout operation, ultralow 0.2 μA shutdown current, and integrated soft start and thermal/overcurrent protection.
Technical Context
The ADP2138ACBZ-3.3-R7 implements a current-mode, fixed-frequency (3 MHz) PWM architecture with automatic transition to hysteretic power save mode (PSM) below 100 mA load. Its internal PFET/NFET synchronous rectifier eliminates external diode losses, while undervoltage lockout (2.15 V threshold) and thermal shutdown (150°C trigger, 20°C hysteresis) ensure robust battery-powered operation.
Control logic responds to EN pin for enable/disable and MODE pin for PWM-only (high) or auto PWM/PSM (low) behavior. The device supports 100% duty cycle for low-input-voltage dropout recovery and includes internal compensation and soft start - requiring only three external components (input cap, output cap, inductor) for full functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% - eliminates external feedback resistors and ensures stable rail for I/O or core logic without calibration. |
| Max Output Current | 800 mA across full input range - supports moderate-power subsystems like baseband processors or RF front-ends. |
| Input Voltage Range | 2.3 V to 5.5 V - compatible with single Li+/Li-Po cells, USB 5 V, or multi-cell alkaline/NiMH sources. |
| Switching Frequency | 3.0 MHz ±13% - enables use of sub-1 μH inductors and <10 mm² total solution size. |
| Quiescent Current | 23 μA typical in active mode - extends battery life in always-on sensor or standby circuits. |
| Shutdown Current | 0.2 μA typical - critical for ultra-low-power wake-on-event architectures. |
| Efficiency Peak | 95% at mid-load - minimizes thermal rise in sealed enclosures and preserves battery capacity. |
Pinout & Package
ADP2138ACBZ-3.3-R7 uses a 6-ball wafer-level chip-scale package (WLCSP), measuring 1.0 mm × 1.5 mm × 0.55 mm, with 0.5 mm ball pitch and bottom-side thermal pad connected to GND for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Ball 1) | 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 (Ball 2) | Switch Node | Drain connection of internal PFET and NFET; connects directly to inductor - high dv/dt node requiring tight layout and minimal loop area. |
| GND (Ball 3) | Ground Reference | Common return for input/output capacitors and internal regulators - tied to PCB thermal pad for thermal conduction and noise reduction. |
| EN (Ball 4) | Enable Control | Active-high logic input; pulls device into shutdown (0.2 μA) when low - compatible with 1.2 V logic thresholds. |
| MODE (Ball 5) | Operating Mode Select | High = forced continuous PWM (low ripple); low = automatic PWM/PSM (optimized light-load efficiency). |
| VOUT (Ball 6) | Feedback Sense | Internal 3.3 V reference connection; not an output pin - used only for regulation; requires short, low-noise trace to output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by >10% vs. asynchronous designs at 500 mA. |
| 100% Duty-Cycle Operation | Enables regulation down to VIN − VDROP ≈ 3.3 V even as input sags - essential for Li+ battery discharge curves. |
| Fast Load Transient Response | Settles within 10 µs for 150 mA → 500 mA step at 3.3 V output - maintains voltage stability for burst-mode digital loads. |
| Internal Soft Start | Ramps output over ~250 µs to limit inrush current - prevents brownout during startup from weak sources like coin cells. |
| Thermal & Overcurrent Protection | Shuts down at 150°C junction temperature with 20°C hysteresis and limits PFET peak current to 1.1–1.65 A - prevents damage under sustained overload. |
Applications
| Wireless Handset Power Management | Digital Camera Core Rail |
|---|---|
Use Scenario: Regulating main 3.3 V supply for baseband processor, memory interface, and audio codec in GSM/UMTS smartphones. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, low-noise 3.3 V rail with fast transient response to handle burst transmit/receive cycles. Use Value: 95% peak efficiency and 23 μA quiescent current extend talk time; 3 MHz switching avoids AM radio band interference. |
Use Scenario: Powering image sensor interface and JPEG encoder ASIC in compact digital cameras. IC Role / Device Role / Timing Role: Fixed-output step-down converter delivering stable 3.3 V under variable load from sensor readout to compression processing. Use Value: 100% duty-cycle mode sustains regulation as battery drops to 3.4 V; tiny WLCSP footprint fits tight camera module layouts. |
| GPS Navigation Unit RF Front-End | Portable Media Player Audio Subsystem |
Use Scenario: Supplying low-noise 3.3 V to GPS LNA and RF synthesizer in handheld navigation devices. IC Role / Device Role / Timing Role: Low-ripple power source with forced PWM mode enabled via MODE pin to suppress switching noise near sensitive RF paths. Use Value: <20 mVPP ripple at 200 mA ensures phase noise performance; 0.2 μA shutdown current preserves battery during cold-start acquisition. |
Use Scenario: Powering DAC, headphone amplifier, and flash memory controller in MP3 players with Li+ battery input. IC Role / Device Role / Timing Role: Efficient, compact DC-DC converter supporting dynamic load changes during playback, buffering, and display updates. Use Value: Automatic PWM/PSM mode delivers >85% efficiency at 10 mA idle and >92% at 300 mA playback - balancing runtime and thermal constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62231DRYR | 3 MHz, 3.3 V fixed, 800 mA, 6-pin WSON (2 mm × 2 mm) - larger footprint, higher 35 μA IQ. | Less suitable for ultra-compact designs; better thermal margin due to larger package. | Select if board space allows 2×2 mm and higher thermal dissipation is needed. |
| ROHM BD9A300MUV-E2 | 3 MHz, 3.3 V fixed, 800 mA, 8-pin DFN (2 mm × 2 mm) - adds PGOOD output and wider 2.7–5.5 V input range. | Requires extra routing for PGOOD; broader input supports USB-only systems without battery backup. | Select if power-good signaling or extended input range is required for system-level monitoring. |
Compared with ADP2138ACBZ-3.3-R7, the TPS62231DRYR offers easier thermal management but sacrifices board area and light-load efficiency, while the BD9A300MUV-E2 adds system-level features at the cost of larger size and no 2.3 V start-up capability - making ADP2138ACBZ-3.3-R7 optimal for minimal-footprint, battery-first portable designs.
Availability
ADP2138ACBZ-3.3-R7 is available at Aetrix Electronics and suitable for wireless handsets, digital cameras, and portable media players requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for ADP2138ACBZ-3.3-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, communications, and industrial markets since 1965.
The ADP2138 series belongs to Analog Devices' compact power management portfolio, engineered specifically for ultra-small, high-efficiency DC-DC conversion in battery-powered portable electronics where board area and quiescent power are critical constraints.
FAQ
What is the recommended input capacitor for ADP2138ACBZ-3.3-R7?
The ADP2138ACBZ-3.3-R7 requires a minimum 4.7 µF ceramic capacitor on the VIN pin, placed as close as possible to Ball 1 (VIN) with low-ESR X5R/X7R dielectric rated for ≥6.3 V. Murata GRM188R60J475 (0603, 6.3 V) is a validated option - this value ensures stable operation, limits input ripple, and supports fast line transients without voltage droop.
Does ADP2138ACBZ-3.3-R7 support automatic mode switching between PWM and PSM?
Yes, ADP2138ACBZ-3.3-R7 supports automatic PWM/PSM mode switching when the MODE pin is held low. It transitions to power save mode below 100 mA load, reducing switching frequency and entering idle periods to achieve >85% efficiency at light loads - while maintaining regulation accuracy within ±2% at 3.3 V output.
Can ADP2138ACBZ-3.3-R7 operate with a 2.5 V input voltage?
Yes, ADP2138ACBZ-3.3-R7 operates down to 2.3 V input, so 2.5 V is fully supported. At this voltage, it enters 100% duty-cycle mode to maintain 3.3 V output - confirmed in datasheet Figure 11 (Load Regulation, VOUT = 3.3 V, PWM Mode) showing <±1% deviation across 2.3–5.5 V input range.
What is the thermal resistance (θJA) of ADP2138ACBZ-3.3-R7 in its WLCSP package?
The junction-to-ambient thermal resistance (θJA) for ADP2138ACBZ-3.3-R7 in its 6-ball WLCSP package is 170°C/W, measured on a standard 4-layer JEDEC board. This value assumes proper PCB layout with thermal vias under the GND ball and adequate copper pour - actual θJA may vary based on board stack-up and heatsinking.
Is ADP2138ACBZ-3.3-R7 pin-compatible with other members of the ADP2138/ADP2139 family?
Yes, all ADP2138 and ADP2139 variants share identical 6-ball WLCSP pinout and footprint - including ADP2138ACBZ-3.3-R7, ADP2138ACBZ-1.8-R7, and ADP2139 variants. However, ADP2139 includes an integrated 100 Ω discharge switch not present in ADP2138ACBZ-3.3-R7, so direct substitution requires verification of discharge requirements.
ADP2138ACBZ-3.3-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):
- 3.3V
- 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-3.3-R7 FAQ
1.How can I place an order for ADP2138ACBZ-3.3-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2138ACBZ-3.3-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-3.3-R7 reliable?
The price and inventory of ADP2138ACBZ-3.3-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-3.3-R7 is usually 5 days.
3.What payment methods are accepted for ADP2138ACBZ-3.3-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2138ACBZ-3.3-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2138ACBZ-3.3-R7?
ADP2138ACBZ-3.3-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2138ACBZ-3.3-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-3.3-R7?
For technical support, including ADP2138ACBZ-3.3-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2138ACBZ-3.3-R7 requirements.
6.How does Aetrix verify that ADP2138ACBZ-3.3-R7 is sourced from the original manufacturer or authorized distributors?
All ADP2138ACBZ-3.3-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-3.3-R7 meets industry standards.
7.What is the process for return or replacement of ADP2138ACBZ-3.3-R7?
All ADP2138ACBZ-3.3-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP2138ACBZ-3.3-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-3.3-R7 part is unused and in its original packaging.
Return procedure for ADP2138ACBZ-3.3-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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