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Analog Devices Inc. ADP1871ACPZ-0.3-R7
- Part No.:
- ADP1871ACPZ-0.3-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
ADP1871ACPZ-0.3-R7.pdf
- Description:
- IC REG CTRLR BUCK 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,366
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Product details
Overview
ADP1871ACPZ-0.3-R7 from Analog Devices is a synchronous buck controller implementing constant on-time and valley current-mode control for high-efficiency DC/DC conversion. It supports 2.95 V to 20 V input, regulates down to 0.6 V output with ±1.0% reference accuracy, operates at 300 kHz, and features power saving mode (PSM) for light-load efficiency in telecom POL supplies.
For engineers reviewing the ADP1871ACPZ-0.3-R7 datasheet, ADP1871ACPZ-0.3-R7 pinout, ADP1871ACPZ-0.3-R7 application, or ADP1871ACPZ-0.3-R7 equivalent, key selection criteria include PSM capability, 300 kHz switching frequency, integrated bootstrap diode, valley current sensing without external resistor, and thermal shutdown at 155°C.
Technical Context
The ADP1871ACPZ-0.3-R7 uses a pseudo-fixed-frequency constant on-time architecture combined with valley current-mode control to achieve fast transient response and stable regulation at low duty cycles. Its current-sense gain is resistor-programmable via the DRVL pin, enabling precise current-limit setting across varying MOSFET RDS(on) values.
It integrates an internal 5 V LDO (VREG) for gate driver biasing, includes precision enable logic with 245–330 mV threshold and 37 mV hysteresis, and supports startup into precharged loads via controlled soft-start (3.0 ms). The device drives all-N-channel power stages and embeds protection including hiccup-mode short-circuit response and thermal shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.95 V to 20 V - supports wide-input industrial and telecom rails without external regulators. |
| Switching Frequency | 300 kHz - balances efficiency, size, and EMI for mid-power POL applications. |
| Output Voltage Accuracy | ±1.0% at 0.6 V reference - ensures tight regulation for DSP/FPGA core supplies. |
| Power Saving Mode | Enabled - pulse-skipping operation improves light-load efficiency in burst-mode systems. |
| Integrated Bootstrap Diode | Yes - eliminates external Schottky diode, reducing BOM count and layout complexity. |
| Thermal Shutdown | 155°C with 15°C hysteresis - provides robust overtemperature protection without external circuitry. |
| Soft Start Time | 3.0 ms - limits inrush current and prevents reverse current during startup into precharged outputs. |
Pinout & Package
ADP1871ACPZ-0.3-R7 is housed in a 10-lead LFCSP package (3 mm × 3 mm, 0.8 mm height) with exposed pad thermally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side MOSFET drain connection | Primary input rail node; must be decoupled near IC with ≥22 µF ceramic capacitor. |
| COMP/EN | Error amplifier output / Enable input | Pull below 285 mV to disable; releases to enable with soft-start initiation. |
| FB | Feedback voltage sense node | Connects to resistor divider from VOUT; sets regulated output via 0.6 V internal reference. |
| GND | Analog ground reference | Reference for error amp, COMP, FB; separate from PGND to minimize noise coupling. |
| VREG | Internal 5 V LDO output | Bias supply for gate drivers; requires 1 µF to PGND + 0.22 µF to GND; not for external loading. |
| DRVL | Low-side gate driver output / current-sense gain select | Drives lower N-MOSFET; resistor from DRVL to PGND programs current-sense gain (e.g., 47 kΩ = 3 V/V). |
| PGND | Power ground return | Return path for low-side driver and MOSFET source; connects to power plane under exposed pad. |
| DRVH | High-side gate driver output | Drives upper N-MOSFET gate; sourced from BST node; rise/fall times ≤25 ns / ≤11 ns. |
| SW | Switch node | Connection between high- and low-side MOSFETs; ties to inductor and BST capacitor negative terminal. |
| BST | Bootstrap capacitor connection | Charged via internal diode from VREG; requires ceramic capacitor (e.g., 0.1 µF) to SW for high-side drive. |
Key Features
| Feature | Design Value |
|---|---|
| Valley current-mode control | Enables stable operation at very low duty cycles (e.g., 0.6 V out from 12 V in) without slope compensation. |
| No external current-sense resistor | Reduces power loss and board area by using MOSFET RDS(on) as current-sense element. |
| Resistor-programmable current-sense gain | Supports accurate current limiting across diverse MOSFET selections via DRVL-to-PGND resistor. |
| Start-up into precharged load | Prevents reverse current flow during soft start when output capacitor is already charged. |
| Integrated bootstrap diode | Eliminates need for external Schottky diode, simplifying layout and improving reliability. |
Applications
| Telecom Point-of-Load Supply | DSP Core Power |
|---|---|
Use Scenario: Regulating 12 V backplane to 1.8 V for baseband processors in 4G/LTE remote radio units. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-current, low-voltage conversion with fast transient response to burst traffic loads. Use Value: PSM mode maintains >85% efficiency at 100 mA load while constant on-time control delivers <50 µs recovery from 50% load step. | Use Scenario: Providing tightly regulated 0.8 V core supply to multi-core digital signal processors in network edge devices. IC Role / Device Role / Timing Role: Valley current-mode controller ensuring stability at 0.8 V/15 A with 300 kHz switching and minimal output capacitance. Use Value: ±1.0% reference accuracy and −40°C to +125°C operation guarantee timing margin compliance across environmental extremes. |
| Mid-Range Server VRM | Set-Top Box SoC Supply |
Use Scenario: Generating 5 V intermediate bus from 12 V input for downstream DDR memory and I/O rails in compact server blades. IC Role / Device Role / Timing Role: High-efficiency buck controller operating at 300 kHz with integrated VREG and bootstrap diode to reduce component count. Use Value: Integrated 5 V LDO powers gate drivers directly, eliminating external bias supply and improving system-level power density. | Use Scenario: Delivering 1.2 V to ARM-based SoCs in consumer set-top boxes requiring low standby power and compact design. IC Role / Device Role / Timing Role: PSM-enabled controller minimizing quiescent current (190–280 µA shutdown) while maintaining regulation during dynamic video decoding loads. Use Value: 3.0 ms soft start prevents inrush-induced brownouts during cold boot, ensuring reliable HDMI handshaking and firmware initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP1870ACPZ-0.3-R7 | Lacks power saving mode (PSM); fixed PWM operation only. | Suitable where light-load efficiency is secondary to consistent switching frequency and jitter performance. | Select when deterministic frequency behavior is required and PSM-induced frequency variation is unacceptable. |
| TPS54332DR | Fixed 3.5 V reference; no valley current sensing; requires external current-sense resistor. | Targeted at cost-sensitive industrial supplies where ±2% output accuracy suffices and 125°C operation is not mandatory. | Choose for simpler designs with lower thermal requirements and less stringent output accuracy needs. |
Compared with ADP1871ACPZ-0.3-R7, the ADP1870ACPZ-0.3-R7 trades PSM for deterministic frequency, while the TPS54332DR sacrifices valley current sensing and high-temp rating for lower BOM cost and simplified compensation.
Availability
ADP1871ACPZ-0.3-R7 is available at Aetrix Electronics and suitable for telecom point-of-load supplies, DSP core power systems, and mid-range server VRMs requiring stable component supply, extended temperature support, and high-efficiency light-load operation.
Supply support for ADP1871ACPZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The ADP1870/ADP1871 product line delivers high-efficiency, high-current synchronous buck controllers optimized for telecom, server, and embedded applications demanding wide input range, low output voltage, and robust thermal performance.
FAQ
What is the switching frequency of the ADP1871ACPZ-0.3-R7?
The ADP1871ACPZ-0.3-R7 is factory-configured for 300 kHz nominal switching frequency. This value is fixed per part number variant and remains stable across load and line conditions within ±10% tolerance, as verified in Figure 23 of the datasheet. The frequency is not user-adjustable via external components.
Does the ADP1871ACPZ-0.3-R7 require an external current-sense resistor?
No, the ADP1871ACPZ-0.3-R7 does not require an external current-sense resistor. It implements low-side MOSFET RDS(on)-based current sensing, with gain programmable via a resistor from DRVL to PGND. This eliminates power loss and PCB area associated with discrete sense resistors.
How does the power saving mode (PSM) operate in the ADP1871ACPZ-0.3-R7?
In PSM, the ADP1871ACPZ-0.3-R7 skips switching pulses under light load to maintain output regulation while reducing switching losses. This occurs automatically when load current drops below the valley current limit threshold, improving efficiency at sub-100 mA loads without requiring external control signals.
What is the purpose of the VREG pin on the ADP1871ACPZ-0.3-R7?
The VREG pin on the ADP1871ACPZ-0.3-R7 outputs a regulated 5 V supply derived from VIN, used internally to bias the gate drivers and analog circuitry. It must be bypassed with 1 µF to PGND and 0.22 µF to GND but must not be loaded externally, as it is not rated for external current draw.
Can the ADP1871ACPZ-0.3-R7 start up into a precharged output?
Yes, the ADP1871ACPZ-0.3-R7 supports startup into a precharged output. Its soft-start circuitry actively monitors the FB pin during ramp-up and disables high-side drive until the output reaches regulation, preventing reverse current flow through the low-side MOSFET body diode.
ADP1871ACPZ-0.3-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-LFCSP-WD (3x3)
ADP1871ACPZ-0.3-R7 FAQ
1.How can I place an order for ADP1871ACPZ-0.3-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1871ACPZ-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 ADP1871ACPZ-0.3-R7 reliable?
The price and inventory of ADP1871ACPZ-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 ADP1871ACPZ-0.3-R7 is usually 5 days.
3.What payment methods are accepted for ADP1871ACPZ-0.3-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1871ACPZ-0.3-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1871ACPZ-0.3-R7?
ADP1871ACPZ-0.3-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1871ACPZ-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 ADP1871ACPZ-0.3-R7?
For technical support, including ADP1871ACPZ-0.3-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1871ACPZ-0.3-R7 requirements.
6.How does Aetrix verify that ADP1871ACPZ-0.3-R7 is sourced from the original manufacturer or authorized distributors?
All ADP1871ACPZ-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 ADP1871ACPZ-0.3-R7 meets industry standards.
7.What is the process for return or replacement of ADP1871ACPZ-0.3-R7?
All ADP1871ACPZ-0.3-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1871ACPZ-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 ADP1871ACPZ-0.3-R7 part is unused and in its original packaging.
Return procedure for ADP1871ACPZ-0.3-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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