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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. ADP1871ARMZ-1.0-R7

Name: ADP1871ARMZ-1.0-R7
Brand: Analog Devices Inc.
SKU: ADP1871ARMZ-1.0-R7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADP1871ARMZ-1.0-R7

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: ADP1871ARMZ-1.0-R7.pdf

Description:: IC REG CTRLR BUCK 10MSOP

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Product details

Overview

ADP1871ARMZ-1.0-R7 from Analog Devices is a synchronous buck controller implementing constant on-time and valley current-mode control for high-efficiency, fast-transient DC/DC conversion. It operates from 3.25 V to 20 V input, delivers 0.6 V output with ±1.0% reference accuracy, supports all-N-channel MOSFET power stages, and features integrated bootstrap diode and power-saving mode (PSM) for light-load efficiency-used in DSP core supplies and 12 V POL applications.

For engineers reviewing the ADP1871ARMZ-1.0-R7 datasheet, ADP1871ARMZ-1.0-R7 pinout, ADP1871ARMZ-1.0-R7 application, or ADP1871ARMZ-1.0-R7 equivalent, key selection criteria include its 1.0 MHz switching frequency, PSM capability, valley current-sense architecture, 10-lead MSOP package, and compatibility with precharged outputs and low-duty-cycle regulation down to 0.6 V.

Technical Context

The ADP1871ARMZ-1.0-R7 uses a pseudo-fixed-frequency constant on-time control scheme with valley current-mode sensing to optimize stability and transient response across wide input/output ratios. Its architecture enables precise current-limit programming via external resistor at DRVL and supports pulse-skipping operation in PSM to maintain regulation while minimizing quiescent current at light loads.

It integrates an internal 5 V LDO (VREG) for gate driver biasing, features precision enable threshold (245–330 mV), and includes thermal shutdown (155°C), hiccup-mode short-circuit protection, and reverse-current protection during soft start. The controller drives high-side and low-side N-MOSFETs with matched rise/fall times (DRVH: 25 ns/11 ns; DRVL: 18 ns/16 ns) and low driver impedances (e.g., DRVH sink resistance ≤1 Ω).

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	1.0 MHz - Enables compact magnetics and high-density POL designs; minimum off-time limited to 340–400 ns.
Input Voltage Range	3.25 V to 20 V - Validated for 1.0 MHz variant; supports 12 V and 16.5 V telecom/server rails.
Output Voltage Accuracy	±1.0% at FB pin (600 mV reference) - Ensures tight regulation over −40°C to +125°C junction range.
Power-Saving Mode	Enabled (ADP1871 only) - Pulse-skipping maintains regulation and improves light-load efficiency vs. forced PWM.
Driver Output Sink Resistance	≤1 Ω (DRVH/DRVL) - Supports fast turn-off of high-capacitance N-MOSFETs with minimal gate drive loss.
Soft Start Period	3.0 ms - Limits in-rush current and prevents reverse current into precharged output during startup.
Thermal Shutdown Threshold	155°C with 15°C hysteresis - Protects IC under sustained overload or poor PCB thermal design.

Pinout & Package

ADP1871ARMZ-1.0-R7 is housed in a 10-lead MSOP package with exposed pad (must be connected to GND per datasheet). Pin count, layout, and thermal performance (θJA = 171.7°C/W on 4-layer board) are validated for high-current synchronous buck applications.

Pin/Terminal	Circuit Role	Design Meaning
VIN	High-side MOSFET drain supply	Accepts 3.25–20 V input; powers internal regulator and high-side gate drive via BST node.
COMP/EN	Error amplifier output / Enable input	Precision enable threshold (245–330 mV); clamped COMP voltage (0.47 V low / 2.55 V high) ensures stable loop control.
FB	Feedback sense node	Connects to resistor divider; regulates output by comparing against 600 mV ±1.0% internal reference.
GND	Analog ground reference	Separate from PGND; required for noise-sensitive analog circuitry (error amp, current sense, reference).
VREG	Internal 5 V LDO output	Bias source for drivers and internal logic; not for external loading; bypassed with 1 µF to PGND + 0.1 µF to GND.
DRVL	Low-side N-MOSFET gate driver	Also sets current-sense gain (resistor from DRVL to PGND); sink/source resistance ≤1 Ω / ≤2.2 Ω.
PGND	Power ground return	Return path for low-side FET source and driver; must be low-inductance connection to minimize switching noise.
DRVH	High-side N-MOSFET gate driver	Driven via bootstrap capacitor (BST–SW); sink/source resistance ≤1 Ω / ≤3 Ω; rise/fall <30 ns.
SW	Switch node	Connection between high- and low-side FETs; critical for EMI and layout; ties to BST capacitor negative terminal.
BST	Bootstrap supply for high-side driver	Internally connected to VREG via diode; requires external capacitor (BST–SW) for high-side gate drive.

Key Features

Feature	Design Value
Valley current-mode control	Enables stable low-duty-cycle operation (e.g., 0.6 V out from 12 V in) without slope compensation.
Integrated bootstrap diode	Eliminates need for external Schottky diode; reduces BOM count and layout area in high-side gate drive path.
Resistor-programmable current-sense gain	Four gain options (2.7–26 V/V) via DRVL-to-PGND resistor; allows optimization of current limit accuracy and noise immunity.
Start-up into precharged output	Prevents reverse current flow during soft start; essential for hot-swap and multi-rail sequencing applications.
Thermal overload and hiccup protection	Shuts down at 155°C and restarts after cooldown; hiccup timing fixed at 6 ms for reliable fault recovery.

Applications

Telecom Point-of-Load Supply	DSP Core Power Delivery
Use Scenario: Regulating 1.8 V or 0.8 V for FPGA/DSP cores from 12 V or 16.5 V backplane rails in base station line cards. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-efficiency, fast-transient power delivery with valley current sensing for stability. Use Value: Achieves >90% efficiency at 10 A load (1.8 V out, 13 V in, 1.0 MHz) and maintains ±1% output accuracy across −40°C to +125°C.	Use Scenario: Providing tightly regulated 0.6 V–1.2 V supply to low-voltage DSP processors in set-top boxes and media gateways. IC Role / Device Role / Timing Role: Constant on-time controller enabling rapid load-step response (<10 µs) and seamless transition between PSM and PWM modes. Use Value: PSM extends battery life or reduces standby power in always-on consumer devices without sacrificing regulation integrity.
Mid-Range Server VRM	Industrial Embedded CPU Supply
Use Scenario: Generating 5 V or 7 V intermediate bus from 12 V input in mid-tier servers where space and thermal density are constrained. IC Role / Device Role / Timing Role: High-frequency (1.0 MHz) synchronous controller driving all-N-MOSFET stage with integrated bootstrap diode and low R_DS(on) driver impedance. Use Value: Reduces total solution size by 30% vs. 300 kHz designs; achieves 95% peak efficiency at 5 V/10 A with Würth 0.9 µH inductor.	Use Scenario: Powering ARM-based industrial controllers requiring robust operation across extended temperature (−40°C to +125°C) and input transients. IC Role / Device Role / Timing Role: Controller with UVLO (2.65 V, 190 mV hysteresis), thermal shutdown, and reverse-current protection for mission-critical reliability. Use Value: Maintains regulation during cold-start and brownout conditions; survives 28 V absolute max VIN surges per JEDEC stress rating.

Telecom Point-of-Load Supply

DSP Core Power Delivery

Use Scenario: Regulating 1.8 V or 0.8 V for FPGA/DSP cores from 12 V or 16.5 V backplane rails in base station line cards.

IC Role / Device Role / Timing Role: Synchronous buck controller managing high-efficiency, fast-transient power delivery with valley current sensing for stability.

Use Value: Achieves >90% efficiency at 10 A load (1.8 V out, 13 V in, 1.0 MHz) and maintains ±1% output accuracy across −40°C to +125°C.

Use Scenario: Providing tightly regulated 0.6 V–1.2 V supply to low-voltage DSP processors in set-top boxes and media gateways.

IC Role / Device Role / Timing Role: Constant on-time controller enabling rapid load-step response (<10 µs) and seamless transition between PSM and PWM modes.

Use Value: PSM extends battery life or reduces standby power in always-on consumer devices without sacrificing regulation integrity.

Mid-Range Server VRM

Industrial Embedded CPU Supply

Use Scenario: Generating 5 V or 7 V intermediate bus from 12 V input in mid-tier servers where space and thermal density are constrained.

IC Role / Device Role / Timing Role: High-frequency (1.0 MHz) synchronous controller driving all-N-MOSFET stage with integrated bootstrap diode and low R_DS(on) driver impedance.

Use Value: Reduces total solution size by 30% vs. 300 kHz designs; achieves 95% peak efficiency at 5 V/10 A with Würth 0.9 µH inductor.

Use Scenario: Powering ARM-based industrial controllers requiring robust operation across extended temperature (−40°C to +125°C) and input transients.

IC Role / Device Role / Timing Role: Controller with UVLO (2.65 V, 190 mV hysteresis), thermal shutdown, and reverse-current protection for mission-critical reliability.

Use Value: Maintains regulation during cold-start and brownout conditions; survives 28 V absolute max VIN surges per JEDEC stress rating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADP1871ARMZ-0.6-R7	600 kHz switching frequency; wider input range (2.95–20 V); higher minimum on-time (82–110 ns at VIN=20 V).	Better suited for higher-current, lower-frequency designs requiring reduced switching loss and larger inductors.	Select when optimizing for full-load efficiency over size; not drop-in due to different frequency and on-time specs.
MP2238DQ-LF-Z	Monolithic 3 A buck converter (integrated MOSFETs); fixed 500 kHz frequency; no PSM mode; smaller 10-pin QFN.	Targeted at space-constrained, medium-power applications where external FETs are undesirable.	Choose for simplified design with lower external component count; not pin-compatible and lacks valley current sensing.

Compared with ADP1871ARMZ-1.0-R7, the ADP1871ARMZ-0.6-R7 trades switching frequency for improved heavy-load efficiency and relaxed timing constraints, while the MP2238DQ-LF-Z sacrifices programmability and PSM for integration and footprint reduction-making each suitable for distinct system-level trade-offs.

Availability

ADP1871ARMZ-1.0-R7 is available at Aetrix Electronics and suitable for telecom point-of-load supplies, DSP core power delivery, and industrial embedded CPU supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADP1871ARMZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADP1870/ADP1871 product line delivers high-frequency, valley current-mode synchronous buck controllers optimized for fast transient response and high efficiency in server, telecom, and embedded power applications.

FAQ

What is the input voltage range for ADP1871ARMZ-1.0-R7?

The ADP1871ARMZ-1.0-R7 supports an input voltage range of 3.25 V to 20 V, specifically validated for the 1.0 MHz frequency variant. This range accommodates common intermediate bus voltages such as 12 V and 16.5 V used in telecom and server applications, and exceeds the 2.95 V minimum of lower-frequency variants to ensure stable high-frequency operation.

Does ADP1871ARMZ-1.0-R7 support power-saving mode (PSM)?

Yes, ADP1871ARMZ-1.0-R7 includes power-saving mode (PSM), which enables pulse-skipping operation at light loads to maintain output regulation while significantly improving system efficiency. This feature is exclusive to the ADP1871 family (not ADP1870) and is confirmed in the General Description and Power Saving Mode section of the Rev. B datasheet.

What package type is used for ADP1871ARMZ-1.0-R7?

ADP1871ARMZ-1.0-R7 is packaged in a 10-lead MSOP with exposed pad, as specified in the Ordering Guide and Outline Dimensions sections of the datasheet. The exposed pad must be soldered to GND for thermal and electrical performance; θJA is rated at 171.7°C/W on a 4-layer PCB.

Can ADP1871ARMZ-1.0-R7 start into a precharged output?

Yes, ADP1871ARMZ-1.0-R7 supports startup into a precharged output, a feature explicitly documented in the General Description and Soft Start section. Its internal circuitry prevents reverse current flow during soft start, making it suitable for hot-swap and multi-rail sequencing applications where output capacitors may already be charged.

What is the feedback reference voltage accuracy of ADP1871ARMZ-1.0-R7?

The ADP1871ARMZ-1.0-R7 features a 600 mV internal reference voltage with ±1.0% accuracy over the full operating junction temperature range (−40°C to +125°C), as specified in the Error Amplifier section of the datasheet. This tolerance ensures tight output regulation in precision power applications such as DSP and CPU core supplies.

ADP1871ARMZ-1.0-R7 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

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):: 3.25V ~ 20V

Frequency - Switching:: 1MHz

Duty Cycle (Max):: 45%

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-MSOP

ADP1871ARMZ-1.0-R7 FAQ

1.How can I place an order for ADP1871ARMZ-1.0-R7 through Aetrix?

Please submit a Request for Quotation (RFQ) for ADP1871ARMZ-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 ADP1871ARMZ-1.0-R7 reliable?

The price and inventory of ADP1871ARMZ-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 ADP1871ARMZ-1.0-R7 is usually 5 days.

3.What payment methods are accepted for ADP1871ARMZ-1.0-R7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1871ARMZ-1.0-R7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ADP1871ARMZ-1.0-R7?

ADP1871ARMZ-1.0-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADP1871ARMZ-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 ADP1871ARMZ-1.0-R7?

For technical support, including ADP1871ARMZ-1.0-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1871ARMZ-1.0-R7 requirements.

6.How does Aetrix verify that ADP1871ARMZ-1.0-R7 is sourced from the original manufacturer or authorized distributors?

All ADP1871ARMZ-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 ADP1871ARMZ-1.0-R7 meets industry standards.

7.What is the process for return or replacement of ADP1871ARMZ-1.0-R7?

All ADP1871ARMZ-1.0-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1871ARMZ-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 ADP1871ARMZ-1.0-R7 part is unused and in its original packaging.

Return procedure for ADP1871ARMZ-1.0-R7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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