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Analog Devices Inc. ADP2105ACPZ-3.3-R7
- Part No.:
- ADP2105ACPZ-3.3-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WQFN Exposed Pad, CSP
- Datasheet:
-
ADP2105ACPZ-3.3-R7.pdf
- Description:
- IC REG BUCK 3.3V 1A 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
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Product details
Overview
ADP2105ACPZ-3.3-R7 from Analog Devices is a 1 A, synchronous step-down DC-DC converter in a 4 mm × 4 mm LFCSP package, operating from 2.7 V to 5.5 V input and delivering a fixed 3.3 V output with ±1% regulation accuracy over temperature and load. It features 1.2 MHz switching frequency, 20 µA quiescent current, and integrated P-channel high-side switch (190 mΩ typical) and N-channel synchronous rectifier (160 mΩ typical), enabling high-efficiency power conversion in space-constrained portable electronics.
For engineers reviewing the ADP2105ACPZ-3.3-R7 datasheet, ADP2105ACPZ-3.3-R7 pinout, ADP2105ACPZ-3.3-R7 application, or ADP2105ACPZ-3.3-R7 equivalent, key selection considerations include its 1 A maximum load capability, ultralow shutdown current (0.1 µA), seamless PWM-to-PFM mode transition for battery life optimization, and compatibility with small ceramic output capacitors in compact PCB layouts.
Technical Context
The ADP2105ACPZ-3.3-R7 employs a peak-current-mode, constant-frequency PWM control architecture at medium-to-heavy loads for stable regulation and fast transient response, while automatically shifting to pulse-frequency modulation (PFM) under light loads to reduce switching losses and maintain >85% efficiency down to 1 mA. Its internal 0.8 V reference feeds a transconductance error amplifier (50 µA/V) and current-sense amplifier (1.875 A/V gain), supporting precise output voltage control and cycle-by-cycle current limiting.
It integrates dual LX outputs (LX1/LX2) tied internally for low-inductance switching node routing, supports 100% duty-cycle operation for low-dropout behavior near VIN, and includes undervoltage lockout (2.4 V rising threshold), programmable soft start (via external SS capacitor), and thermal shutdown (140°C). The exposed-pad LFCSP package delivers θJA = 40°C/W for reliable thermal performance in high-density designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1% (3.267–3.333 V at 10 mA, −40°C to +125°C) |
| Max Output Current | 1 A continuous - defines maximum supported load without thermal derating or current limit activation |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li+/Li− polymer, multi-cell alkaline/NiMH, and PCMCIA sources |
| Switching Frequency | 1.2 MHz typical - enables use of sub-3 µH inductors and reduces EMI filter size |
| Quiescent Current | 20 µA typical - minimizes standby power loss in always-on subsystems |
| Shutdown Current | 0.1 µA max - ensures negligible battery drain during system sleep modes |
| Efficiency Peak | 97% at medium load - achieved via integrated synchronous rectification and low RDS(on) switches |
Pinout & Package
ADP2105ACPZ-3.3-R7 uses a 16-lead, 4 mm × 4 mm LFCSP package with exposed thermal pad soldered to PCB ground plane. Pin numbering follows top-view layout with EN (Pin 1), GND (Pins 2,3,4,15), COMP (Pin 5), SS (Pin 6), AGND (Pin 7), NC (Pin 8), PWIN1/PWIN2 (Pins 9,13), LX1/LX2 (Pins 10,12), PGND (Pin 11), IN (Pin 14), and FB (Pin 16).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable logic input | Active-high digital control: drives device ON/OFF; <0.4 V disables, >2 V enables; draws <0.1 µA in shutdown |
| FB (Pin 16) | Feedback sense input | Internally connected to 0.8 V reference; for fixed 3.3 V version, directly tied to output; sets regulation point |
| LX1 / LX2 (Pins 10, 12) | Switch node outputs | Drain terminals of integrated P-FET and N-FET; must be shorted externally and routed to LC filter; high di/dt path |
| PGND (Pin 11) | Power ground return | Low-impedance return for input/output capacitors and inductor; connects to exposed pad for thermal conduction |
| AGND (Pin 7) | Analog ground reference | Reference for FB, COMP, SS, and internal error amp; must be star-connected near IC and tied to exposed pad |
| PWIN1 / PWIN2 (Pins 9, 13) | High-side switch source inputs | Supply rails for P-channel MOSFET gate drive; require local 4.7 µF+ bypass to PGND per pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 20 µA typical - extends battery runtime in always-on mobile applications without sacrificing regulation accuracy |
| Synchronous rectification | Integrated N-channel MOSFET (160 mΩ typ.) eliminates external Schottky loss, improving efficiency by ~5–8% vs. diode-based solutions |
| Adaptive control scheme | Automatic PWM-to-PFM transition - maintains >80% efficiency from 1 mA to 1 A, optimizing power across full load range |
| 100% duty-cycle LDO mode | Enables dropout operation when VIN approaches VOUT - sustains regulated 3.3 V output down to VIN = 3.3 V |
| Programmable soft start | External SS capacitor (e.g., 1 nF → 1 ms ramp) limits inrush current and prevents output overshoot during power-up |
Applications
| Mobile Handsets | PDAs and Palmtop Computers |
|---|---|
Use Scenario: Powering baseband processor I/O rails and auxiliary peripherals from single-cell Li+ battery. IC Role / Device Role / Timing Role: Primary 3.3 V supply regulator delivering stable voltage during dynamic CPU load transitions. Use Value: 97% peak efficiency and 20 µA quiescent current extend talk time and standby duration without requiring external LDO post-regulation. |
Use Scenario: Generating clean 3.3 V for memory interfaces, display controllers, and USB PHY in handheld computing devices. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter replacing discrete switcher solutions on constrained PCB real estate. Use Value: 4 mm × 4 mm LFCSP footprint and support for 4.7 µF ceramic output capacitors reduce total solution size by >40% vs. legacy modules. |
| Telecom Equipment | Audio/Video Consumer Electronics |
Use Scenario: Supplying 3.3 V to Ethernet PHYs, PoE interface logic, and low-power FPGAs in compact networking gear. IC Role / Device Role / Timing Role: Input-stage DC-DC converter accepting wide-input 3.3–5.5 V rails and delivering tightly regulated output. Use Value: Undervoltage lockout (2.4 V) prevents deep battery discharge; 1.2 MHz switching avoids interference with sensitive RF bands. |
Use Scenario: Powering HDMI transmitter ICs, audio DACs, and microcontroller subsystems in set-top boxes and streaming sticks. IC Role / Device Role / Timing Role: Fixed-output buck regulator providing low-noise, ripple-controlled 3.3 V for mixed-signal circuits. Use Value: Integrated soft start and current-mode control suppress startup transients that could disrupt audio/video synchronization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 1 A, 3.3 V fixed, 2.05–6.0 V input, 3.6 MHz switching, 17 µA IQ, 0.5 µA shutdown | Higher switching frequency enables smaller inductors but increases EMI sensitivity; no PFM mode - less efficient below 10 mA | Preferred where board area is critical and light-load efficiency is secondary; requires different compensation network |
| RT8059NGQW | 1 A, 3.3 V fixed, 2.5–5.5 V input, 1.5 MHz switching, 25 µA IQ, 0.1 µA shutdown, built-in soft start | Wider input range not needed for Li+ systems; slightly higher quiescent current; lacks 100% duty-cycle mode | Better suited for multi-source systems (e.g., USB + battery); same LFCSP footprint but different pinout - PCB redesign required |
Compared with TPS62231DRVR and RT8059NGQW, ADP2105ACPZ-3.3-R7 offers superior light-load efficiency via true PFM operation and 100% duty-cycle capability for ultra-low dropout, making it optimal for battery-powered devices requiring long standby life and robust low-VIN operation.
Availability
ADP2105ACPZ-3.3-R7 is available at Aetrix Electronics and suitable for mobile handsets, PDAs, telecom equipment, and audio/video consumer electronics requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for ADP2105ACPZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and consumer markets.
ADP2105ACPZ-3.3-R7 belongs to Analog Devices' ADP210x family of ultra-low-IQ synchronous buck converters, designed specifically for extended battery life and minimal solution size in portable and always-on embedded systems.
FAQ
What is the maximum continuous output current of the ADP2105ACPZ-3.3-R7?
The ADP2105ACPZ-3.3-R7 is rated for 1 A maximum continuous output current under typical thermal conditions (θJA = 40°C/W, 4-layer board, exposed pad soldered). This rating assumes ambient temperature ≤85°C and proper PCB copper pour for heat dissipation. At higher temperatures or reduced copper area, derating applies per the thermal characteristics table in the datasheet. The ADP2105ACPZ-3.3-R7 current limit is factory-trimmed to 1.5 A typical, ensuring safe operation up to its specified 1 A load.
Does the ADP2105ACPZ-3.3-R7 require external compensation components?
Yes, the ADP2105ACPZ-3.3-R7 requires an external RC network from the COMP pin (Pin 5) to AGND to stabilize the control loop. For the fixed 3.3 V version, Analog Devices provides recommended values in the datasheet's Loop Compensation section - typically a 1.2 kΩ resistor in series with a 1 nF capacitor. Omitting or incorrectly sizing these components can cause instability, oscillation, or poor transient response. The ADP2105ACPZ-3.3-R7 does not integrate full Type II or Type III compensation.
Can the ADP2105ACPZ-3.3-R7 operate with input voltage equal to its 3.3 V output?
Yes, the ADP2105ACPZ-3.3-R7 supports 100% duty-cycle operation, allowing it to function in low-dropout (LDO-like) mode when VIN drops to 3.3 V. In this mode, the high-side P-FET remains fully enhanced and the synchronous rectifier is disabled, minimizing conduction loss. The ADP2105ACPZ-3.3-R7 maintains regulation down to VIN = VOUT, provided minimum input voltage specifications (2.7 V) and thermal limits are respected. This feature is confirmed in the General Description and Theory of Operation sections.
What is the purpose of the PWIN1 and PWIN2 pins on the ADP2105ACPZ-3.3-R7?
PWIN1 and PWIN2 (Pins 9 and 13) serve as dedicated source connections for the integrated P-channel high-side MOSFET gate driver. They must be bypassed individually to PGND with ≥4.7 µF ceramic capacitors placed as close as possible to the ADP2105ACPZ-3.3-R7. These pins decouple gate drive current transients from the main IN rail, reducing noise coupling and improving stability. Unlike IN (Pin 14), which powers internal circuitry, PWIN1/PWIN2 supply only the high-side switch - a key distinction confirmed in the Pin Function Descriptions table.
How does the ADP2105ACPZ-3.3-R7 manage efficiency across varying load conditions?
The ADP2105ACPZ-3.3-R7 uses dual-mode control: constant-frequency PWM at medium-to-heavy loads (≥50 mA) for tight regulation and low noise, and variable-frequency PFM at light loads (<50 mA) to minimize switching losses. This architecture achieves >85% efficiency from 1 mA to 1 A, with peak efficiency of 97% at ~300 mA. Efficiency curves in Figures 5–6 of the datasheet confirm this behavior across input voltages (2.7 V–5.5 V) and temperatures. The ADP2105ACPZ-3.3-R7's 20 µA quiescent current directly enables high light-load efficiency.
ADP2105ACPZ-3.3-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad, CSP
- 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):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LFCSP (4x4)
ADP2105ACPZ-3.3-R7 FAQ
1.How can I place an order for ADP2105ACPZ-3.3-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2105ACPZ-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 ADP2105ACPZ-3.3-R7 reliable?
The price and inventory of ADP2105ACPZ-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 ADP2105ACPZ-3.3-R7 is usually 5 days.
3.What payment methods are accepted for ADP2105ACPZ-3.3-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2105ACPZ-3.3-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2105ACPZ-3.3-R7?
ADP2105ACPZ-3.3-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2105ACPZ-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 ADP2105ACPZ-3.3-R7?
For technical support, including ADP2105ACPZ-3.3-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2105ACPZ-3.3-R7 requirements.
6.How does Aetrix verify that ADP2105ACPZ-3.3-R7 is sourced from the original manufacturer or authorized distributors?
All ADP2105ACPZ-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 ADP2105ACPZ-3.3-R7 meets industry standards.
7.What is the process for return or replacement of ADP2105ACPZ-3.3-R7?
All ADP2105ACPZ-3.3-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP2105ACPZ-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 ADP2105ACPZ-3.3-R7 part is unused and in its original packaging.
Return procedure for ADP2105ACPZ-3.3-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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