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Analog Devices Inc. ADP2105ACPZ-1.2-R7
- Part No.:
- ADP2105ACPZ-1.2-R7
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WQFN Exposed Pad, CSP
- Datasheet:
-
ADP2105ACPZ-1.2-R7.pdf
- Description:
- IC REG BUCK 1.2V 1A 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,394
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Product details
Overview
ADP2105ACPZ-1.2-R7 from Analog Devices is a 1 A, synchronous step-down DC-to-DC converter in a 4 mm × 4 mm LFCSP package, delivering fixed 1.2 V output from 2.7 V–5.5 V input, with 97% peak efficiency, 20 µA quiescent current, and 1.2 MHz switching frequency-designed for power management in battery-powered portable electronics.
For engineers reviewing the ADP2105ACPZ-1.2-R7 datasheet, ADP2105ACPZ-1.2-R7 pinout, ADP2105ACPZ-1.2-R7 application, or ADP2105ACPZ-1.2-R7 equivalent, key selection criteria include its 1.2 V preset output accuracy (±1%), ultralow shutdown current (0.1 µA), integrated P-channel high-side switch (190 mΩ typ), and seamless PWM/PFM mode transition for wide-load-efficiency optimization.
Technical Context
The ADP2105ACPZ-1.2-R7 employs a peak-current-mode, constant-frequency PWM architecture at medium-to-heavy loads (up to 1 A), with slope compensation and 110 ns minimum on-time for stable operation across input and load transients. Its control loop uses an internal 0.8 V reference and transconductance error amplifier (50 µA/V) with external COMP compensation.
Under light load, it automatically transitions to pulse-frequency modulation (PFM) mode-reducing switching frequency and quiescent current to 20 µA-while maintaining regulation. It supports 100% duty-cycle LDO-like operation near dropout and includes undervoltage lockout (2.4 V rising threshold) and thermal shutdown (140°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±1% over temperature and line/load (ensures stable core voltage for low-power MCUs and RF ICs) |
| Max Output Current | 1 A continuous (matches ADP2105 variant; enables single-rail supply for SoC subsystems or sensor hubs) |
| Input Voltage Range | 2.7 V to 5.5 V (supports single Li+/Li− polymer cell, dual alkaline/NiMH, or USB-powered systems) |
| Switching Frequency | 1.2 MHz ±167 kHz (enables compact 2.2 µH–3.3 µH inductors and ceramic output capacitors ≤10 µF) |
| Quiescent Current | 20 µA typical (extends battery life in always-on wearable or IoT edge nodes) |
| Shutdown Current | 0.1 µA max (minimizes leakage during system sleep; critical for >1-year coin-cell operation) |
| Efficiency Peak | 97% at 3.6 VIN/1.2 VOUT/500 mA (reduces thermal load in sealed enclosures and improves power density) |
Pinout & Package
ADP2105ACPZ-1.2-R7 uses a 16-lead, 4 mm × 4 mm LFCSP package with exposed thermal pad soldered to PCB ground plane. Pin functions are validated per Analog Devices Rev. E datasheet Figure 4 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable logic input | Active-high digital control; <0.4 V disables device and reduces IN current to 0.1 µA |
| IN (Pin 14) | Main power input | Supplies internal bias circuitry; bypassed with 0.1 µF to AGND; connected to PWIN1 via 10 Ω resistor |
| PWIN1/PWIN2 (Pins 9,13) | High-side switch source inputs | Direct connection to PFET source; each requires ≥4.7 µF ceramic capacitor to PGND for low-impedance power delivery |
| LX1/LX2 (Pins 10,12) | Switch node outputs | Drain terminals of integrated P-channel switch and N-channel synchronous rectifier; must be tied together and routed to LC filter |
| PGND (Pin 11) | Power ground return | Low-impedance return path for all input/output capacitors; connected to exposed pad |
| AGND (Pin 7) | Analog ground reference | Reference for FB, COMP, SS; must be star-connected near IC and tied to exposed pad |
| FB (Pin 16) | Feedback input | Internally regulated to 0.8 V; for fixed 1.2 V version, directly connected to output; no external divider needed |
| SS (Pin 6) | Soft-start timing node | Connect 1 nF capacitor to AGND for 1 ms soft-start; limits inrush current during power-up |
| COMP (Pin 5) | Loop compensation node | Output of transconductance error amplifier; requires RC network to AGND for stability (e.g., 10 kΩ + 1 nF) |
| GND (Pins 2,3,4,15) | Test pins | Not functional grounds; must be tied to AGND plane near IC per layout guidelines |
| NC (Pin 8) | No connect | Unbonded; may be left floating or tied to AGND-no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves full-load efficiency by ~5–8% vs. asynchronous designs |
| Automatic PWM-to-PFM mode transition | Maintains >85% efficiency down to 1 mA load without manual mode control or external circuitry |
| 100% duty cycle LDO mode | Enables regulation when VIN drops within ~100 mV of VOUT-critical for brownout resilience in Li+ battery discharge profiles |
| Ultralow 0.1 µA shutdown current | Meets stringent energy budget requirements for multi-year battery life in remote sensors and BLE peripherals |
| Internal 0.8 V feedback reference | Enables precise 1.2 V output (1.2 V = 0.8 V × 1.5) with ±1% tolerance-no trimming required for production calibration |
Applications
| Mobile Handsets | Wearable Health Monitors |
|---|---|
|
Use Scenario: Powering application processor I/O rails and baseband modem cores in compact smartphones with tight thermal constraints. IC Role / Device Role / Timing Role: Primary 1.2 V buck regulator supplying digital core voltage under dynamic load (0–1 A), synchronized to system clock domain. Use Value: 97% peak efficiency minimizes heat generation in stacked PCB assemblies; 1.2 MHz switching avoids AM radio band interference. |
Use Scenario: Supplying ultra-low-power MCU, optical heart-rate sensor, and BLE radio in wrist-worn devices powered by CR2032 or thin-film batteries. IC Role / Device Role / Timing Role: Always-on power rail generator with automatic light-load PFM mode to sustain >2-year battery life at 10 µA average system current. Use Value: 20 µA quiescent current and 0.1 µA shutdown enable multi-year operation; small 4 mm × 4 mm footprint saves board space. |
| Industrial IoT Edge Nodes | Portable Medical Diagnostics |
|
Use Scenario: Providing stable 1.2 V supply to ARM Cortex-M4 microcontrollers and sub-GHz RF transceivers in battery-operated condition-monitoring sensors. IC Role / Device Role / Timing Role: Main system power converter with EN-controlled wake-up sequencing and UVLO protection against deep battery discharge. Use Value: Undervoltage lockout (2.4 V rising) prevents data corruption during battery sag; 16-pin LFCSP supports automated optical inspection (AOI) and reflow. |
Use Scenario: Powering precision analog front-ends (AFE), ADCs, and low-noise amplifiers in handheld ECG or glucose meters requiring clean, stable 1.2 V bias. IC Role / Device Role / Timing Role: Low-noise, tightly regulated supply rail with soft-start (1 ms) to prevent signal baseline shift during power-up. Use Value: Integrated synchronous rectifier and optimized loop compensation reduce output ripple to <10 mVpp, preserving signal integrity in medical-grade measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-to-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1 A, 1.2 V fixed, 3 MHz switching, 17 µA IQ, 2 mm × 2 mm WSON | Higher frequency allows smaller inductors but increases EMI sensitivity; lower IQ benefits ultra-low-power sleep modes | Prefer for space-constrained designs where 3 MHz EMI can be filtered; verify loop stability with 1 µH inductor |
| MAX8640YETA+ | 1 A, 1.2 V fixed, 2.25 MHz, 25 µA IQ, 2 mm × 2 mm TDFN | Higher switching frequency and slightly higher IQ; lacks PFM mode-uses forced PWM only | Choose when deterministic PWM timing is required for EMI scheduling; avoid in battery-only applications needing PFM efficiency |
Compared with TPS62231DRYR and MAX8640YETA+, the ADP2105ACPZ-1.2-R7 offers superior light-load efficiency via true PFM mode and better thermal performance in 4 mm × 4 mm LFCSP-making it optimal for thermally constrained, battery-backed portable systems demanding both peak and standby efficiency.
Availability
ADP2105ACPZ-1.2-R7 is available at Aetrix Electronics and suitable for mobile handsets, wearable health monitors, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADP2105ACPZ-1.2-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.
The ADP2105ACPZ-1.2-R7 belongs to Analog Devices' ADP210x family of low-quiescent-current synchronous buck converters-designed specifically for extended battery life and compact power solutions in portable and energy-sensitive applications.
FAQ
What is the output voltage tolerance of ADP2105ACPZ-1.2-R7 over temperature and load?
The ADP2105ACPZ-1.2-R7 delivers a fixed 1.2 V output with ±1% tolerance (1.188 V to 1.212 V) across full load (0–1 A), input range (2.7 V–5.5 V), and temperature (−40°C to +125°C). This is achieved via internal 0.8 V reference and precision trimming-no external components affect regulation accuracy. The ADP2105ACPZ-1.2-R7 maintains this spec without user adjustment.
Does ADP2105ACPZ-1.2-R7 require external compensation components?
Yes, the ADP2105ACPZ-1.2-R7 requires an external RC network from COMP (Pin 5) to AGND for loop stability. Typical values are 10 kΩ in series with 1 nF, as validated in Analog Devices' design examples. The COMP pin is the output of the internal transconductance error amplifier (50 µA/V), and proper compensation ensures phase margin >45° across operating conditions. The ADP2105ACPZ-1.2-R7 does not support internal compensation.
Can ADP2105ACPZ-1.2-R7 operate with input voltage below 2.7 V?
No-ADP2105ACPZ-1.2-R7 has a guaranteed operating input range of 2.7 V to 5.5 V. Below 2.7 V, undervoltage lockout activates (rising threshold = 2.4 V), disabling regulation. While 100% duty cycle LDO mode extends functionality near dropout, the ADP2105ACPZ-1.2-R7 will not start or sustain regulation if VIN falls below 2.4 V. For sub-2.7 V operation, consider the ADP211x or other ultra-low-VIN buck families.
How is thermal performance managed in ADP2105ACPZ-1.2-R7?
The ADP2105ACPZ-1.2-R7 uses a 4 mm × 4 mm LFCSP package with an exposed thermal pad that must be soldered to a PCB ground plane. With θJA = 40°C/W and maximum power dissipation of 1 W, proper thermal layout keeps junction temperature within −40°C to +125°C. Thermal shutdown triggers at 140°C with 40°C hysteresis. The ADP2105ACPZ-1.2-R7 relies on this pad-not ambient convection-for safe 1 A operation.
Is ADP2105ACPZ-1.2-R7 pin-compatible with other ADP210x variants?
Yes-ADP2105ACPZ-1.2-R7 shares identical 16-lead LFCSP pinout, footprint, and pin functions with ADP2106 and ADP2107 variants (e.g., ADP2106ACPZ-1.2-R7, ADP2107ACPZ-1.2-R7). Only the internal current-limit circuitry differs (1.5 A or 2 A peak), so upgrading current capability requires verifying inductor saturation and thermal margins-but no PCB change is needed. The ADP2105ACPZ-1.2-R7 is fully drop-in compatible within the same output voltage option.
ADP2105ACPZ-1.2-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):
- 1.2V
- 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-1.2-R7 FAQ
1.How can I place an order for ADP2105ACPZ-1.2-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP2105ACPZ-1.2-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-1.2-R7 reliable?
The price and inventory of ADP2105ACPZ-1.2-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-1.2-R7 is usually 5 days.
3.What payment methods are accepted for ADP2105ACPZ-1.2-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP2105ACPZ-1.2-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP2105ACPZ-1.2-R7?
ADP2105ACPZ-1.2-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP2105ACPZ-1.2-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-1.2-R7?
For technical support, including ADP2105ACPZ-1.2-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP2105ACPZ-1.2-R7 requirements.
6.How does Aetrix verify that ADP2105ACPZ-1.2-R7 is sourced from the original manufacturer or authorized distributors?
All ADP2105ACPZ-1.2-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-1.2-R7 meets industry standards.
7.What is the process for return or replacement of ADP2105ACPZ-1.2-R7?
All ADP2105ACPZ-1.2-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP2105ACPZ-1.2-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-1.2-R7 part is unused and in its original packaging.
Return procedure for ADP2105ACPZ-1.2-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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