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Analog Devices Inc. ADP1879ACPZ-1.0-R7
- Part No.:
- ADP1879ACPZ-1.0-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-WFDFN Exposed Pad, CSP
- Datasheet:
-
ADP1879ACPZ-1.0-R7.pdf
- Description:
- IC REG CTRLR BUCK 14LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,214
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Product details
Overview
ADP1879ACPZ-1.0-R7 from Analog Devices is a synchronous buck controller with constant on-time and valley current-mode control, operating at 1.0 MHz switching frequency. It supports input voltages from 3.25 V to 20 V, delivers output down to 0.6 V with ±1.0% reference accuracy, and integrates an internal 5 V LDO bias regulator and bootstrap diode. It is used in high-efficiency, space-constrained DC/DC conversion for DSP core supplies and mid-to-high-end servers.
For engineers reviewing the ADP1879ACPZ-1.0-R7 datasheet, ADP1879ACPZ-1.0-R7 pinout, ADP1879ACPZ-1.0-R7 application, or ADP1879ACPZ-1.0-R7 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed PSM operation, and two rigorously cross-checked alternative parts for 1.0 MHz synchronous buck control.
Technical Context
The ADP1879ACPZ-1.0-R7 implements a valley current-mode architecture with pseudo-fixed-frequency constant on-time control, enabling stable regulation at low duty cycles (e.g., 0.8 V out from 5 V in) and fast transient response. Its 1.0 MHz switching frequency requires minimum on-time of 52 ns (typ) and minimum off-time of 340 ns (min), both validated across temperature.
It features power saving mode (PSM) - exclusive to the ADP1879 variant - enabling pulse-skipping at light loads to improve system efficiency, while retaining forced PWM capability via external configuration. The integrated bootstrap diode and standalone precision enable input eliminate external components required by competing controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.0 MHz - enables compact magnetics and high-density layout; validated min off-time ≥340 ns ensures stable operation at 45% max duty cycle. |
| Input Voltage Range | 3.25 V to 20 V - supports wide-input industrial and telecom rails; higher VIN threshold vs. 300/600 kHz variants improves noise immunity. |
| Output Voltage Accuracy | ±1.0% at 0.6 V reference - ensures tight regulation for modern DSP/FPGA cores; maintained over −40°C to +125°C junction range. |
| Power Saving Mode | PSM enabled - reduces light-load quiescent current and improves efficiency without sacrificing regulation; unique to ADP1879 (not ADP1878). |
| VREG Output | 5.0 V ±0.2 V (typ) - powers gate drivers and internal circuitry; dropout ≤415 mV at 100 mA allows reliable operation even at low VIN. |
| Current Sense | No external sense resistor required - uses low-side MOSFET RDS(on) sensing; RES pin programmable gain (3 V/V typical with 47 kΩ) sets current limit. |
| Thermal Protection | 155°C thermal shutdown with 15°C hysteresis - prevents damage during overload; exposed pad tied to GND enhances thermal dissipation (θJA = 30°C/W). |
Pinout & Package
The ADP1879ACPZ-1.0-R7 is housed in a 14-lead LFCSP_WD package (3 mm × 3 mm × 0.8 mm) with exposed pad thermally connected to analog ground (GND). Pin numbering follows top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | High-side input supply | Connects to drain of external high-side N-MOSFET; rated up to 20 V; UVLO triggers at 2.65 V rising edge. |
| COMP (Pin 2) | Error amplifier output | Drives external compensation network (RC/CC); clamped between 0.47 V and 2.55 V for stability control. |
| EN (Pin 3) | Precision enable input | Logic-high threshold 634 mV (typ); 31 mV hysteresis prevents chatter; ties directly to VREG for startup. |
| FB (Pin 4) | Feedback node | Senses regulated output via resistor divider; 0.6 V reference with ±1.0% accuracy over full temp range. |
| GND (Pin 5) | Analog ground reference | Reference for sensitive analog circuits (error amp, COMP); must be isolated from PGND in layout. |
| RES (Pin 6) | Current-sense gain setting | Resistor to PGND sets gain (3 V/V typical); enables accurate current limiting without sense resistor. |
| VREG (Pin 7) | Internal 5 V bias regulator | Supplies gate drivers and internal logic; bypass with 1 µF to PGND + 0.1 µF to GND per datasheet. |
| SS (Pin 8) | Soft-start timing | Capacitor to GND sets ramp time (10 nF/ms); limits inrush and prevents reverse current into precharged outputs. |
| PGOOD (Pin 9) | Open-drain power-good flag | Sinks current when FB out-of-regulation or thermal shutdown; internal pull-up eliminates external resistor. |
| DRVL (Pin 10) | Low-side gate driver output | Drives source of low-side N-MOSFET; also serves as current-sense gain reference point. |
| PGND (Pin 11) | Power ground return | Return path for low-side driver and MOSFET; separate from analog GND to minimize noise coupling. |
| DRVH (Pin 12) | High-side gate driver output | Drives gate of high-side N-MOSFET; sourced from BST node; rise/fall times <25 ns / <11 ns (typ). |
| SW (Pin 13) | Switch node | Connects to source of high-side MOSFET and drain of low-side MOSFET; critical for EMI and layout. |
| BST (Pin 14) | Bootstrap supply | Charged via internal diode from VREG; capacitor to SW generates floating gate drive for high-side FET. |
Key Features
| Feature | Design Value |
|---|---|
| Power Saving Mode (PSM) | Enables pulse-skipping at light loads to reduce quiescent current and boost efficiency - exclusive to ADP1879 variant. |
| Integrated Bootstrap Diode | Eliminates need for external Schottky diode; reduces BOM count and layout area while maintaining robust high-side drive. |
| Valley Current-Mode Control | Provides inherent cycle-by-cycle current limiting and stable operation at low duty cycles (e.g., 0.8 V out from 13 V in). |
| Start-Up Into Precharged Output | Prevents reverse current flow during hot-plug scenarios; essential for systems with backup capacitors or shared rails. |
| Resistor-Programmable Current Limit | Uses RES pin to set gain (3 V/V typical with 47 kΩ), enabling precise overcurrent protection without sense resistor losses. |
| Standalone Precision Enable Input | EN threshold (634 mV typ) and hysteresis (31 mV) allow clean, noise-immune power sequencing without external comparators. |
Applications
| Telecom Power Supply | DSP Core Regulator |
|---|---|
|
Use Scenario: Point-of-load regulation for FPGA or ASIC cores in 48 V telecom rectifier systems with intermediate 12 V bus. IC Role / Device Role / Timing Role: Synchronous buck controller managing 1.0 MHz switching, valley current sensing, and PSM for dynamic load profiles. Use Value: Achieves >90% efficiency at 1.8 V/10 A with minimal footprint; PSM extends battery backup runtime during idle periods. |
Use Scenario: Low-noise, tightly regulated supply for high-speed digital signal processors requiring 0.8–1.2 V at up to 12 A. IC Role / Device Role / Timing Role: Constant on-time controller delivering fast transient response (<10 µs) and ±1.0% output accuracy. Use Value: Maintains regulation under 50% load step changes; integrated VREG and soft-start simplify design and improve reliability. |
| Mid-Range Server VRM | Set-Top Box SoC Supply |
|
Use Scenario: Primary 1.05 V/20 A CPU core supply in dual-socket server motherboards with 12 V input rail. IC Role / Device Role / Timing Role: High-frequency (1.0 MHz) buck controller driving all-N-channel MOSFET stage with valley current limit. Use Value: Enables use of smaller inductors (e.g., 0.22 µH) and ceramic output caps; thermal shutdown protects during fan failure. |
Use Scenario: Compact, cost-sensitive 1.1 V SoC supply in consumer set-top boxes powered from 5 V or 12 V wall adapters. IC Role / Device Role / Timing Role: Integrated-bias controller eliminating external LDO; PSM reduces standby power below 50 mW. Use Value: Meets Energy Star standby requirements; start-up into precharged output avoids brownout during wake-from-sleep. |
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-1.0-R7 | No Power Saving Mode (PSM); identical pinout, frequency, and control architecture. | Lacks light-load efficiency optimization; suitable only where forced PWM is mandatory or PSM causes EMI concerns. | Select ADP1878ACPZ-1.0-R7 if PSM-induced frequency variation is unacceptable in noise-sensitive environments. |
| TPS54620RGYT | 600 kHz fixed frequency; no valley current mode; uses external current-sense resistor; 4.5–17 V input. | Lower switching frequency increases inductor size; lacks PSM but offers adjustable current limit and better EMI control. | Choose TPS54620RGYT when design prioritizes predictable EMI spectrum over size/efficiency, and external sense resistor is acceptable. |
Compared with ADP1878ACPZ-1.0-R7, the ADP1879ACPZ-1.0-R7 adds PSM for superior light-load efficiency without layout change; versus TPS54620RGYT, it achieves higher frequency, smaller passives, and resistorless current sensing - but requires careful attention to valley-mode loop compensation.
Availability
ADP1879ACPZ-1.0-R7 is available at Aetrix Electronics and suitable for telecom infrastructure, server VRMs, and consumer SoC power supplies requiring stable component supply, long-term lifecycle support, and guaranteed 1.0 MHz performance.
Supply support for ADP1879ACPZ-1.0-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 ADP1879ACPZ-1.0-R7 belongs to Analog Devices' high-frequency synchronous buck controller product line, designed specifically for efficient, compact, and thermally robust point-of-load regulation in computing and communications equipment.
FAQ
What is the key functional difference between ADP1879ACPZ-1.0-R7 and ADP1878ACPZ-1.0-R7?
The ADP1879ACPZ-1.0-R7 includes Power Saving Mode (PSM) for pulse-skipping at light loads, improving efficiency in low-power states; the ADP1878ACPZ-1.0-R7 lacks PSM and operates exclusively in forced PWM. Both share identical pinout, 1.0 MHz frequency, and valley current-mode architecture - making them drop-in replacements except where PSM behavior is critical.
Does ADP1879ACPZ-1.0-R7 require an external bootstrap diode?
No. The ADP1879ACPZ-1.0-R7 integrates a bootstrap diode between VREG and BST pins, eliminating the need for an external Schottky diode. A BST-to-SW capacitor remains mandatory, and an external diode may be added only to increase gate drive capability under high-current or high-temperature conditions - not for basic operation.
What is the minimum input voltage for ADP1879ACPZ-1.0-R7 at 1.0 MHz operation?
The ADP1879ACPZ-1.0-R7 specifies a minimum input voltage of 3.25 V for 1.0 MHz operation, as confirmed in Table 1 of the Rev. B datasheet. This is higher than the 2.95 V minimum for the 300 kHz and 600 kHz variants due to timing constraints at high frequency.
How does the RES pin configure current limiting on ADP1879ACPZ-1.0-R7?
The RES pin on ADP1879ACPZ-1.0-R7 sets current-sense amplifier gain: a 47 kΩ resistor to PGND yields 3.0 V/V gain (typ), enabling accurate current limit detection using the low-side MOSFET's RDS(on). No external current-sense resistor is needed, reducing power loss and board area - a key differentiator from resistor-based controllers.
Can ADP1879ACPZ-1.0-R7 start up into a precharged output voltage?
Yes. The ADP1879ACPZ-1.0-R7 supports start-up into a precharged output, preventing reverse current flow through the low-side MOSFET body diode. This is achieved via internal circuitry that monitors SW node voltage during soft-start and disables low-side drive until the output reaches regulation - critical for hot-swap and redundant power systems.
ADP1879ACPZ-1.0-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):
- 3.25V ~ 20V
- Frequency - Switching:
- 1MHz
- Duty Cycle (Max):
- 45%
- 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-1.0-R7 FAQ
1.How can I place an order for ADP1879ACPZ-1.0-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1879ACPZ-1.0-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-1.0-R7 reliable?
The price and inventory of ADP1879ACPZ-1.0-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-1.0-R7 is usually 5 days.
3.What payment methods are accepted for ADP1879ACPZ-1.0-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1879ACPZ-1.0-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1879ACPZ-1.0-R7?
ADP1879ACPZ-1.0-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1879ACPZ-1.0-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-1.0-R7?
For technical support, including ADP1879ACPZ-1.0-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1879ACPZ-1.0-R7 requirements.
6.How does Aetrix verify that ADP1879ACPZ-1.0-R7 is sourced from the original manufacturer or authorized distributors?
All ADP1879ACPZ-1.0-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-1.0-R7 meets industry standards.
7.What is the process for return or replacement of ADP1879ACPZ-1.0-R7?
All ADP1879ACPZ-1.0-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1879ACPZ-1.0-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-1.0-R7 part is unused and in its original packaging.
Return procedure for ADP1879ACPZ-1.0-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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