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Analog Devices Inc. ADP2109ACBZ-1.8-R7
- Part No.:
- ADP2109ACBZ-1.8-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 5-WFBGA, WLCSP
- Datasheet:
-
ADP2109ACBZ-1.8-R7.pdf
- Description:
- IC REG BUCK 1.8V 600MA 5WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,900
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Product details
Overview
ADP2109ACBZ-1.8-R7 from Analog Devices is a fixed-output 1.8 V, 600 mA synchronous step-down DC/DC converter in a 5-ball WLCSP package, featuring 3 MHz switching frequency, internal discharge switch (150 Ω), 95% peak efficiency, and 18 μA quiescent current - designed for battery-powered portable electronics requiring fast transient response and automatic output discharge on shutdown.
For engineers reviewing the ADP2109ACBZ-1.8-R7 datasheet, ADP2109ACBZ-1.8-R7 pinout, ADP2109ACBZ-1.8-R7 application, or ADP2109ACBZ-1.8-R7 equivalent, key selection considerations include its 2.3–5.5 V input range, power save mode transition at 80 mA, 100% duty-cycle low-dropout operation, thermal shutdown at 150°C, and compatibility with tiny 0.7–3 μH inductors and 4.7–10 μF ceramic capacitors.
Technical Context
The ADP2109ACBZ-1.8-R7 employs a high-speed current-mode PWM architecture with fixed 3 MHz oscillator, enabling stable regulation and fast line/load transient response. Its integrated PFET/NFET synchronous rectifier and internal compensation eliminate external loop components.
It operates in two distinct modes: fixed-frequency PWM (≥80 mA load) for tight regulation and low ripple, and hysteretic power save mode (<80 mA) to minimize light-load losses - with seamless transitions and no external mode control required. The internal discharge switch activates during shutdown, UVLO, or thermal shutdown to safely bleed the output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% (PWM mode); enables direct replacement of LDOs in 1.8 V core/logic rails without feedback resistor network. |
| Max Output Current | 600 mA across full 2.3–5.5 V input range; supports single Li+/Li-Po cells or dual alkaline/NiMH batteries. |
| Switching Frequency | 3.0 MHz (±0.5 MHz); allows use of sub-3 mm² total solution size with 1 μH inductor and 4.7–10 μF X5R/X7R ceramics. |
| Quiescent Current | 18 μA (typical); extends battery runtime in always-on or low-duty-cycle portable devices like GPS units and media players. |
| Discharge Switch RDS(ON) | 150 Ω (at VOUT = 1.0 V); discharges 10 μF output cap to <100 mV in ~200 μs, preventing residual voltage hazards during system reset. |
| Thermal Shutdown | 150°C with 20°C hysteresis; protects silicon integrity under sustained overload or poor PCB thermal design. |
| Enable Threshold | EN high ≥1.2 V, low ≤0.4 V; compatible with standard 1.8 V/3.3 V GPIOs without level-shifting. |
Pinout & Package
Package: 5-ball Wafer-Level Chip Scale Package (WLCSP), 0.8 mm × 0.8 mm × 0.4 mm, 0.4 mm ball pitch, bottom-side solder balls. Requires microvia or plated-through-hole PCB stack-up for reliable assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1) | Input Power Supply | Connects to 2.3–5.5 V source; must be bypassed with ≥2.2 μF ceramic capacitor placed adjacent to A1 ball to suppress high-frequency switching noise. |
| GND (A2) | Power Ground Reference | Common return for input/output capacitors and IC substrate; requires low-inductance connection to PCB ground plane. |
| SW (B) | Switch Node | Drain of internal PFET and source of NFET synchronous rectifier; connects directly to inductor; high dv/dt node requiring minimal trace area and guard ring. |
| EN (C1) | Logic Enable Input | Active-high digital control; pulls device into <1 μA shutdown when low; supports sequencing and dynamic power gating. |
| FB (C2) | Feedback Input | Internally connected to 1.8 V reference; not externally configurable - eliminates external resistor divider and associated leakage/error sources. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectifier | Eliminates external Schottky diode, reducing conduction loss and board area - critical for >90% efficiency at 3.6 VIN/1.8 VOUT. |
| Integrated Discharge Switch | 150 Ω NMOS switch tied to FB pin; automatically discharges output on EN deassertion, UVLO, or thermal fault - avoids need for external bleed circuitry. |
| Current-Mode Control | Enables cycle-by-cycle current limiting and inherent stability with minimal external compensation - simplifies design for wide input/output ranges. |
| 100% Duty-Cycle Operation | PFET remains fully on when input drops near output voltage; maintains regulation down to VIN ≈ VOUT + 0.1 V - essential for Li+ battery end-of-discharge support. |
| Internal Soft Start | Linear output ramp prevents inrush current spikes into large output caps; eliminates need for external soft-start timing capacitor or resistor. |
Applications
| Wireless Handsets | Digital Cameras |
|---|---|
Use Scenario: Powering baseband processor I/O and RF transceiver bias rails during burst transmission. IC Role / Device Role / Timing Role: Primary 1.8 V point-of-load regulator delivering up to 600 mA with <550 μs startup time and automatic discharge between transmit/receive cycles. Use Value: Enables rapid power cycling without residual voltage causing logic glitches; 3 MHz switching avoids interference with cellular band receivers. | Use Scenario: Supplying image sensor interface and ISP core voltage during high-frame-rate capture. IC Role / Device Role / Timing Role: Low-noise, fast-transient 1.8 V supply with <1.5% load regulation error from 10 mA to 500 mA. Use Value: Maintains sensor ADC reference stability during flash LED current surges; internal soft start prevents shutter timing jitter. |
| GPS Navigation Units | Portable Media Players |
Use Scenario: Regulating GNSS baseband SoC core voltage in compact handheld units with limited PCB real estate. IC Role / Device Role / Timing Role: Ultra-compact 5-ball WLCSP step-down converter supporting 2.7–4.2 V Li-ion input and delivering 1.8 V @ 300 mA. Use Value: Reduces total BOM count to only three passives (inductor + 2 caps); 18 μA quiescent current extends standby time beyond 100 hours. | Use Scenario: Powering NAND flash controller and audio codec in battery-constrained MP3/MP4 players. IC Role / Device Role / Timing Role: Dual-mode regulator operating in PWM (music playback) and power save (pause/standby) to optimize energy per byte. Use Value: Achieves >92% efficiency at 20 mA load in PSM, extending playback time by 18% versus fixed-frequency-only converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP2108ACBZ-1.8-R7 | No internal discharge switch; identical 1.8 V output, 600 mA rating, 3 MHz frequency, and WLCSP package. | Lacks automatic output discharge - requires external circuit if system-level reset safety mandates VOUT collapse on shutdown. | Select when discharge function is unnecessary and cost minimization is prioritized; same layout but missing discharge capability. |
| TPS62231DRVR | TI part: 1.8 V fixed, 600 mA, 3.6 MHz, 12 μA IQ, but uses 6-pin WSON (2.0 × 2.0 mm), no discharge switch. | Higher switching frequency allows smaller inductor but larger footprint; lacks discharge functionality and has different enable threshold (0.4 V low). | Choose for higher-frequency designs where board space permits larger package; verify EN compatibility and add external discharge if needed. |
Compared with ADP2109ACBZ-1.8-R7, ADP2108ACBZ-1.8-R7 saves cost but forfeits safe discharge, while TPS62231DRVR offers lower IQ and higher fSW at the expense of package size and missing discharge - making ADP2109ACBZ-1.8-R7 uniquely suited for space-constrained, safety-critical portable systems requiring guaranteed VOUT collapse.
Availability
ADP2109ACBZ-1.8-R7 is available at Aetrix Electronics and suitable for wireless handsets, digital cameras, GPS navigation units, and portable media players requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for ADP2109ACBZ-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 precision instrumentation, industrial automation, communications, and automotive markets.
The ADP2109 belongs to Analog Devices' ultra-compact, high-efficiency DC/DC converter product line, engineered specifically for battery-powered portable electronics demanding minimal solution size, low quiescent current, and robust protection features - including integrated discharge for system-level safety compliance.
FAQ
What is the maximum input voltage the ADP2109ACBZ-1.8-R7 can handle?
The ADP2109ACBZ-1.8-R7 supports an absolute maximum input voltage of +6.5 V, but its operational input range is specified from 2.3 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate reliability limits defined in the Absolute Maximum Ratings table. For continuous operation, maintain VIN within 2.3–5.5 V to ensure proper UVLO behavior, thermal stability, and output accuracy. The ADP2109ACBZ-1.8-R7 is optimized for single-cell Li+/Li-Po and multi-cell alkaline/NiMH sources.
Does the ADP2109ACBZ-1.8-R7 require external feedback resistors?
No, the ADP2109ACBZ-1.8-R7 does not require external feedback resistors. It is a fixed-output 1.8 V converter with the feedback reference internally trimmed and connected directly to the FB pin. This eliminates resistor tolerance errors, temperature drift, and board space typically consumed by a divider network - simplifying layout and improving long-term output voltage stability. The FB pin is not user-accessible for adjustment; it serves solely as the internal error amplifier input node.
How does the power save mode work in the ADP2109ACBZ-1.8-R7?
The ADP2109ACBZ-1.8-R7 enters power save mode automatically when load current falls below 80 mA. In this mode, it switches from fixed-frequency PWM to a hysteretic control scheme that reduces switching activity, lowering quiescent current to ~18 μA. Output voltage ripple increases slightly (±1.5% around nominal), but efficiency improves significantly at light loads. The ADP2109ACBZ-1.8-R7 transitions seamlessly back to PWM mode when load exceeds 85 mA - no external control or configuration is needed.
Can the ADP2109ACBZ-1.8-R7 operate with a 1.0 μH inductor?
Yes, the ADP2109ACBZ-1.8-R7 is fully compatible with a 1.0 μH inductor. The datasheet recommends inductor values between 0.7 μH and 3.0 μH for optimal performance. A 1.0 μH shielded ferrite inductor (e.g., Murata LQM2HPN1R0M or Coilcraft LPS3010-102) provides excellent balance of size, saturation current (>1.5 A), and DCR (<100 mΩ), ensuring stable operation across the full 600 mA load range and minimizing core losses at 3 MHz. Inductor selection must meet ISAT and DCR requirements per the External Component Selection section.
What protection features are built into the ADP2109ACBZ-1.8-R7?
The ADP2109ACBZ-1.8-R7 integrates six key protections: (1) undervoltage lockout (UVLO) triggers at 2.15 V falling to prevent deep battery discharge; (2) thermal shutdown at 150°C with 20°C hysteresis; (3) current limit protecting PFET peak current to 1.1–1.5 A; (4) short-circuit protection via frequency foldback; (5) internal soft start limiting inrush current; and (6) discharge switch activation during shutdown, UVLO, or thermal fault. All functions are autonomous - no external components required.
ADP2109ACBZ-1.8-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 5-WFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- 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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-WLCSP (1.02x1.45)
ADP2109ACBZ-1.8-R7 FAQ
1.How can I place an order for ADP2109ACBZ-1.8-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2109ACBZ-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 ADP2109ACBZ-1.8-R7 reliable?
The price and inventory of ADP2109ACBZ-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 ADP2109ACBZ-1.8-R7 is usually 5 days.
3.What payment methods are accepted for ADP2109ACBZ-1.8-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2109ACBZ-1.8-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2109ACBZ-1.8-R7?
ADP2109ACBZ-1.8-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2109ACBZ-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 ADP2109ACBZ-1.8-R7?
For technical support, including ADP2109ACBZ-1.8-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2109ACBZ-1.8-R7 requirements.
6.How does Aetrix verify that ADP2109ACBZ-1.8-R7 is sourced from the original manufacturer or authorized distributors?
All ADP2109ACBZ-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 ADP2109ACBZ-1.8-R7 meets industry standards.
7.What is the process for return or replacement of ADP2109ACBZ-1.8-R7?
All ADP2109ACBZ-1.8-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP2109ACBZ-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 ADP2109ACBZ-1.8-R7 part is unused and in its original packaging.
Return procedure for ADP2109ACBZ-1.8-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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