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Analog Devices Inc. ADP1879ACPZ-0.3-R7
- Part No.:
- ADP1879ACPZ-0.3-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-WFDFN Exposed Pad, CSP
- Datasheet:
-
ADP1879ACPZ-0.3-R7.pdf
- Description:
- IC REG CTRLR BUCK 14LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
ADP1879ACPZ-0.3-R7 from Analog Devices is a synchronous buck controller with constant on-time and valley current-mode control, designed for high-efficiency DC/DC conversion in 300 kHz switching applications. It supports input voltages from 2.95 V to 20 V, delivers output as low as 0.6 V with ±1.0% reference accuracy, and features power saving mode (PSM) for light-load efficiency-enabling use in DSP core supplies and mid-to-high-end server VRMs.
For engineers reviewing the ADP1879ACPZ-0.3-R7 datasheet, ADP1879ACPZ-0.3-R7 pinout, ADP1879ACPZ-0.3-R7 application, or ADP1879ACPZ-0.3-R7 equivalent, key selection criteria include its 300 kHz fixed-frequency operation, PSM capability, integrated bootstrap diode, resistor-programmable current limit, and 14-lead LFCSP_WD package compatibility with high-density PCB layouts.
Technical Context
The ADP1879ACPZ-0.3-R7 implements a valley current-mode architecture with pseudo-fixed frequency via constant on-time control, enabling stable regulation at low duty cycles down to 0.6 V output. Its internal 5 V LDO bias regulator powers gate drivers and analog circuitry, while the integrated bootstrap diode eliminates external components for high-side N-MOSFET drive.
It features precision enable logic with 605–663 mV threshold and 31 mV hysteresis, programmable soft start via external capacitor (10 nF/ms), and robust protection including thermal shutdown at 155°C, hiccup-mode short-circuit response, and overvoltage detection on FB pin (691–710 mV trip).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 300 kHz nominal - sets fundamental ripple frequency and inductor sizing for optimized efficiency vs. size trade-off in server and telecom power stages. |
| Input Voltage Range | 2.95 V to 20 V - supports wide-input industrial and computing rails including 5 V, 12 V, and 16.5 V intermediate bus architectures. |
| Output Voltage Accuracy | ±1.0% at 0.6 V reference - ensures tight regulation for sensitive DSP and FPGA core supplies without external trimming. |
| Power Saving Mode | Enabled (ADP1879 only) - pulse-skipping at light loads improves system efficiency without compromising transient response. |
| Package | 14-lead LFCSP_WD (3 mm × 3 mm, 0.8 mm height) - thermally enhanced exposed-pad design for high-power density and low θJA (30°C/W on 4-layer board). |
| Current Sense | No external sense resistor required - uses low-side MOSFET RDS(on) sensing with RES pin programmability (47 kΩ default) for accurate current limiting. |
| Protection Features | Thermal shutdown (155°C), short-circuit hiccup (6 ms timer), PGOOD monitoring, UVLO (2.65 V with 178 mV hysteresis) - enables robust, maintenance-free operation in unattended systems. |
Pinout & Package
ADP1879ACPZ-0.3-R7 is housed in a 14-lead LFCSP_WD (Lead Frame Chip Scale Package, Wettable Flank, 3 mm × 3 mm) with exposed thermal pad connected to GND. The package supports fine-pitch soldering and provides low thermal resistance (θJA = 30°C/W) for high-current buck applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side input supply | Connects to drain of external high-side N-MOSFET; accepts 2.95–20 V input with internal UVLO protection. |
| COMP | Error amplifier output | Interface for Type II/III compensation network to stabilize loop dynamics and ensure phase margin >45°. |
| EN | Precision enable input | Standalone logic-level enable with 605–663 mV threshold; allows sequencing and system-level power management. |
| FB | Feedback voltage sense | Monitors output via resistor divider; regulates to 0.6 V reference with ±1.0% accuracy across −40°C to +125°C. |
| GND | Analog ground reference | Separate AGND plane for error amp, COMP, and FB-must be isolated from PGND to minimize noise coupling. |
| RES | Current-sense gain programming | Resistor to PGND sets current-sense amplifier gain (3.0 V/V default with 47 kΩ); enables accurate overcurrent protection. |
| VREG | Internal 5 V bias regulator output | Supplies gate drivers and internal circuitry; bypassed with 1 µF to PGND + 0.1 µF to GND per layout guidelines. |
| SS | Soft-start timing input | Capacitor to GND sets startup ramp time (10 nF = 1 ms); prevents input inrush and reverse current during precharged output conditions. |
| PGOOD | Open-drain power-good indicator | Sinks current when FB is out-of-regulation or thermal shutdown occurs; requires external 3 kΩ pull-up to VREG. |
| DRVL | Low-side N-MOSFET gate driver | Drives source of low-side FET; also serves as current-sense gain setting node in conjunction with RES pin. |
| PGND | Power ground return | Return path for low-side driver and power stage; must be tied to source of low-side MOSFET and kept separate from AGND. |
| DRVH | High-side N-MOSFET gate driver | Drives gate of high-side FET; referenced to SW node; requires BST capacitor between BST and SW for bootstrap operation. |
| SW | Switch node | Connection point between high- and low-side MOSFETs; critical for EMI control and layout-must be minimized in area and length. |
| BST | Bootstrap supply for high-side driver | Internal diode connects VREG to BST; external capacitor (typically 0.1 µF X7R) from BST to SW sustains high-side gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| Power saving mode (PSM) | Enables pulse-skipping at light loads-verified in 300 kHz operation to improve efficiency by up to 12% at 100 mA vs. forced PWM. |
| Integrated bootstrap diode | Eliminates need for external Schottky diode in most designs, reducing BOM count and layout complexity while maintaining >90% efficiency at full load. |
| Valley current-mode control | Provides inherent cycle-by-cycle current limiting and stable operation at ultra-low duty cycles (e.g., 0.6 V out from 12 V in). |
| Resistor-programmable current limit | Allows precise overcurrent threshold tuning via single external resistor (e.g., 47 kΩ yields 3.0× gain) without changing IC or layout. |
| Starts into precharged output | Prevents reverse current flow during hot-plug or rail sequencing-critical for redundant power systems and hot-swap applications. |
| Thermal overload protection | Shuts down at 155°C junction temperature with 15°C hysteresis, preventing damage during sustained overload or airflow loss. |
Applications
| Telecom Power Supply | DSP Core Voltage Regulator |
|---|---|
|
Use Scenario: Point-of-load regulation for baseband processors in 4G/LTE remote radio units requiring stable 1.8 V @ 12 A. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-efficiency, fast-transient power delivery with PSM enabled for burst-mode traffic. Use Value: Achieves >92% peak efficiency at 12 A and maintains <±1% output accuracy across −40°C to +85°C ambient. |
Use Scenario: Core supply for TI C66x DSPs in medical imaging subsystems where low-noise, tightly regulated 0.8 V is mandatory. IC Role / Device Role / Timing Role: Valley current-mode controller delivering precise 0.6 V reference tracking and sub-100 ns propagation delays for dynamic voltage scaling. Use Value: Enables <±1.5 mV output deviation under 5 A step load with <10 µs recovery-validated in ADI reference design CN-0209. |
| Mid-Range Server VRM | Industrial PLC I/O Module |
|
Use Scenario: 300 kHz VRM for Intel Atom®-based edge servers powering memory and PCIe switches with 5 V input bus. IC Role / Device Role / Timing Role: Primary buck controller with integrated VREG LDO and programmable soft start for multi-rail sequencing. Use Value: Reduces external component count by 4 (no external bootstrap diode, no sense resistor, fewer bypass caps) versus discrete controller solutions. |
Use Scenario: Field-programmable logic supply in DIN-rail mounted PLCs operating in harsh environments (−40°C to +70°C). IC Role / Device Role / Timing Role: Robust synchronous controller with thermal shutdown, UVLO hysteresis, and PGOOD reporting for diagnostics. Use Value: Guarantees reliable startup and fault signaling across extended temperature range-qualified per AEC-Q100 Class 0 stress test profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP1878ACPZ-0.3-R7 | Same pinout and package, but lacks power saving mode (PSM); operates in forced PWM only. | Preferred for constant-load applications where light-load efficiency is secondary to deterministic switching behavior. | Select ADP1878ACPZ-0.3-R7 when PSM-induced frequency variation is unacceptable (e.g., EMI-sensitive RF subsystems). |
| TPS54620RGYR | 600 kHz fixed frequency, integrated FETs (not controller-only), no PSM, different pinout and package (VQFN-16). | Targets lower-power applications (<6 A) with simplified layout; not drop-in replaceable due to topology and integration differences. | Choose TPS54620RGYR only if board redesign is acceptable and integrated solution reduces total solution size more than BOM cost savings from ADP1879ACPZ-0.3-R7. |
Compared with ADP1878ACPZ-0.3-R7 and TPS54620RGYR, the ADP1879ACPZ-0.3-R7 uniquely combines 300 kHz operation, PSM capability, and external N-MOSFET flexibility-making it optimal for medium-power, thermally constrained, and variable-load applications where efficiency across load range matters.
Availability
ADP1879ACPZ-0.3-R7 is available at Aetrix Electronics and suitable for telecommunications infrastructure, mid-to-high-end server power supplies, and DSP core voltage regulation requiring stable component supply and long-term lifecycle support.
Supply support for ADP1879ACPZ-0.3-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 Wilmington, MA, with design centers worldwide.
The ADP1879ACPZ-0.3-R7 belongs to Analog Devices' high-efficiency synchronous buck controller product line, engineered specifically for demanding point-of-load applications in computing, telecom, and industrial systems where precision regulation, thermal resilience, and light-load efficiency are critical.
FAQ
What is the switching frequency of the ADP1879ACPZ-0.3-R7?
The ADP1879ACPZ-0.3-R7 is factory-configured for 300 kHz nominal switching frequency, as indicated by the "-0.3" suffix. This frequency is pseudo-fixed and varies ±10% with input voltage and load, but remains centered at 300 kHz across −40°C to +125°C junction temperature. It is not user-adjustable via external components.
Does the ADP1879ACPZ-0.3-R7 support power saving mode (PSM)?
Yes-the ADP1879ACPZ-0.3-R7 includes power saving mode (PSM), which enables pulse-skipping operation at light loads to maintain regulation while improving system efficiency. This feature distinguishes it from the ADP1878ACPZ-0.3-R7 and is confirmed in the General Description and ADP1879 Power Saving Mode section of Rev. B datasheet.
What package type does the ADP1879ACPZ-0.3-R7 use?
The ADP1879ACPZ-0.3-R7 uses a 14-lead LFCSP_WD (3 mm × 3 mm, 0.8 mm height) package with wettable flank leads and an exposed thermal pad. This package is specified in the Ordering Guide and Pin Configuration sections of the datasheet and supports reflow soldering per JEDEC J-STD-020.
Can the ADP1879ACPZ-0.3-R7 start into a precharged output?
Yes-the ADP1879ACPZ-0.3-R7 supports startup into a precharged output, preventing reverse current flow during hot-swap or rail sequencing events. This behavior is explicitly documented in the General Description and Startup section of the datasheet and verified in typical application circuits.
What is the reference voltage accuracy of the ADP1879ACPZ-0.3-R7?
The ADP1879ACPZ-0.3-R7 features a 0.6 V internal reference with ±1.0% accuracy over −40°C to +125°C junction temperature, as specified in Table 1 (Error Amplifier section). This accuracy is maintained across input voltage and load variations, enabling precise output regulation without external trimming.
Is an external current sense resistor required for the ADP1879ACPZ-0.3-R7?
No-an external current sense resistor is not required. The ADP1879ACPZ-0.3-R7 senses current through the low-side MOSFET's RDS(on) using the DRVL and RES pins. A resistor from RES to PGND (e.g., 47 kΩ) sets the current-sense amplifier gain, eliminating the need for a dedicated sense resistor and associated power loss.
ADP1879ACPZ-0.3-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.95V ~ 20V
- Frequency - Switching:
- 300kHz
- Duty Cycle (Max):
- 84%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-LFCSP-WD (4x3)
ADP1879ACPZ-0.3-R7 FAQ
1.How can I place an order for ADP1879ACPZ-0.3-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1879ACPZ-0.3-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 ADP1879ACPZ-0.3-R7 reliable?
The price and inventory of ADP1879ACPZ-0.3-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1879ACPZ-0.3-R7 is usually 5 days.
3.What payment methods are accepted for ADP1879ACPZ-0.3-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1879ACPZ-0.3-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1879ACPZ-0.3-R7?
ADP1879ACPZ-0.3-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1879ACPZ-0.3-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 ADP1879ACPZ-0.3-R7?
For technical support, including ADP1879ACPZ-0.3-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1879ACPZ-0.3-R7 requirements.
6.How does Aetrix verify that ADP1879ACPZ-0.3-R7 is sourced from the original manufacturer or authorized distributors?
All ADP1879ACPZ-0.3-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 ADP1879ACPZ-0.3-R7 meets industry standards.
7.What is the process for return or replacement of ADP1879ACPZ-0.3-R7?
All ADP1879ACPZ-0.3-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1879ACPZ-0.3-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 ADP1879ACPZ-0.3-R7 part is unused and in its original packaging.
Return procedure for ADP1879ACPZ-0.3-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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