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

Analog Devices Inc. ADP1870ARMZ-0.3-R7

Name: ADP1870ARMZ-0.3-R7
Brand: Analog Devices Inc.
SKU: ADP1870ARMZ-0.3-R7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADP1870ARMZ-0.3-R7

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

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

Datasheet:: ADP1870ARMZ-0.3-R7.pdf

Description:: IC REG CTRLR BUCK 10MSOP

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Product details

Overview

ADP1870ARMZ-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, delivers ≥0.6 V output with ±1.0% reference accuracy, operates at 300 kHz nominal switching frequency, and drives all-N-channel MOSFET power stages in telecom, server, and DSP core supplies.

For engineers reviewing the ADP1870ARMZ-0.3-R7 datasheet, ADP1870ARMZ-0.3-R7 pinout, ADP1870ARMZ-0.3-R7 application, or ADP1870ARMZ-0.3-R7 equivalent, key selection criteria include its valley current-limit programmability via DRVL resistor, integrated bootstrap diode, precision enable threshold (245–330 mV), thermal shutdown at 155°C, and compatibility with precharged load startup.

Technical Context

The ADP1870ARMZ-0.3-R7 uses a pseudo-fixed-frequency constant on-time architecture combined with valley current-mode sensing to maintain stability and transient response across wide duty-cycle ranges. Its valley current-limit setting is resistor-programmable via the DRVL pin, enabling precise overcurrent protection without external sense resistors.

It integrates an internal 5 V LDO (VREG) for gate driver biasing, features an internal bootstrap rectifier between VREG and BST, and supports soft-start (3.0 ms) with reverse-current protection. The controller operates from −40°C to +125°C junction temperature and requires no external current-sense resistor.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.95 V to 20 V - supports wide-input industrial and telecom rails including 12 V and 16.5 V POL systems.
Switching Frequency	300 kHz nominal - balances efficiency, size, and EMI for mid-power applications like DSP cores and set-top boxes.
Output Voltage Accuracy	±1.0% at FB = 0.6 V - ensures tight regulation for low-voltage microprocessor and ASIC supplies.
Reference Voltage	0.6 V ±1.0% - enables stable 0.6 V minimum output, critical for modern sub-1 V logic domains.
Enable Threshold	245–330 mV with 37 mV hysteresis - allows precise system-level power sequencing using simple resistor dividers.
Thermal Shutdown	155°C with 15°C hysteresis - provides robust overtemperature protection during sustained overload or poor heatsinking.
Soft Start Time	3.0 ms - limits inrush current and prevents reverse current flow during startup into precharged outputs.

Pinout & Package

ADP1870ARMZ-0.3-R7 is housed in a 10-lead MSOP package with exposed pad (must be connected to GND). Pin 1 is VIN; Pin 2 is COMP/EN (dual-function error amplifier output and enable input); Pin 3 is FB (feedback node); Pin 4 is analog GND; Pin 5 is VREG (internal 5 V bias supply); Pin 6 is DRVL (low-side driver output and current-sense gain setting); Pin 7 is PGND (power ground); Pin 8 is DRVH (high-side driver output); Pin 9 is SW (switch node); Pin 10 is BST (bootstrap capacitor connection).

Pin/Terminal	Circuit Role	Design Meaning
VIN	High-side MOSFET drain connection	Accepts 2.95–20 V input; powers internal circuitry and high-side gate drive via bootstrap path.
COMP/EN	Error amplifier output / Enable input	When pulled <285 mV, disables IC; when released, controls loop compensation and enables operation.
FB	Noninverting input of error amplifier	Senses output voltage via resistor divider; regulates output to 0.6 V reference with ±1.0% accuracy.
GND	Analog ground reference	Provides low-noise return for sensitive analog blocks; must be separated from PGND in layout.
VREG	Internal 5 V LDO output	Bias supply for gate drivers and internal logic; not for external loading; bypassed with 1 µF to PGND and 0.1 µF to GND.
DRVL	Low-side N-MOSFET gate driver / current-sense gain	Drives lower FET; resistor from DRVL to PGND sets current-sense gain (e.g., 47 kΩ = 3 V/V).
PGND	Power ground return	Return path for low-side driver and source of lower MOSFET; connects to power plane under exposed pad.
DRVH	High-side N-MOSFET gate driver	Drives upper FET gate; sourced from BST node; rise/fall times ≤25 ns/11 ns into 4.3 nF load.
SW	Switch node	Connection point between high- and low-side MOSFETs; routes to inductor and output capacitor.
BST	Bootstrap capacitor terminal	Connected to SW via external capacitor; internal diode charges BST from VREG to enable high-side drive.

Key Features

Feature	Design Value
No current-sense resistor required	Valley current sensing via DRVL pin eliminates external R_sense, reducing BOM cost and PCB area.
Integrated bootstrap diode	Internal diode between VREG and BST reduces component count and improves reliability vs. discrete Schottky solutions.
Starts into precharged load	Soft-start logic prevents reverse current flow when output is already charged, enabling hot-swap capability.
Resistor-programmable current-sense gain	Four gain options (e.g., 3 V/V, 6 V/V) selected by DRVL-to-PGND resistor, enabling flexible overcurrent thresholds.
Thermal overload and short-circuit protection	Hiccup-mode current limiting with 6 ms timing and 155°C shutdown ensure safe operation under fault conditions.

Applications

Telecom Power Modules	Server Point-of-Load Supplies
Use Scenario: Regulating 12 V input to 0.8 V/1.8 V for FPGA or ASIC cores in 48 V telecom rectifier systems. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-efficiency, high-current DC/DC conversion with fast transient response. Use Value: Achieves >90% efficiency at 10 A load (V_OUT = 1.8 V, V_IN = 13 V) while maintaining ±1.0% output accuracy across −40°C to +125°C.	Use Scenario: Providing tightly regulated 0.6 V–7 V outputs for CPU/GPU VRMs in mid-to-high-end servers. IC Role / Device Role / Timing Role: Valley current-mode controller delivering stable low-duty-cycle operation down to 0.6 V output. Use Value: Enables reliable 300 kHz operation with <1.5 mV line regulation and 32 mV load regulation, critical for digital load transients.
DSP Core Power Supplies	Set-Top Box Main Rails
Use Scenario: Generating 1.2 V or 1.8 V for TI C6000 or ADI SHARC DSPs from 5.5 V or 12 V intermediate bus. IC Role / Device Role / Timing Role: Constant on-time buck controller ensuring minimal output voltage deviation during rapid load steps. Use Value: Delivers <1% output voltage deviation under 10 A/µs load transients due to valley current-loop bandwidth optimization.	Use Scenario: Converting 12 V input to 3.3 V or 5 V for SoC, memory, and audio subsystems in consumer STBs. IC Role / Device Role / Timing Role: High-efficiency synchronous controller supporting light-load efficiency via optimized gate drive timing. Use Value: Maintains >85% efficiency at 100 mA load (V_OUT = 5 V) with 190–280 µA shutdown current, reducing standby power.

Telecom Power Modules

Server Point-of-Load Supplies

Use Scenario: Regulating 12 V input to 0.8 V/1.8 V for FPGA or ASIC cores in 48 V telecom rectifier systems.

IC Role / Device Role / Timing Role: Synchronous buck controller managing high-efficiency, high-current DC/DC conversion with fast transient response.

Use Value: Achieves >90% efficiency at 10 A load (V_OUT = 1.8 V, V_IN = 13 V) while maintaining ±1.0% output accuracy across −40°C to +125°C.

Use Scenario: Providing tightly regulated 0.6 V–7 V outputs for CPU/GPU VRMs in mid-to-high-end servers.

IC Role / Device Role / Timing Role: Valley current-mode controller delivering stable low-duty-cycle operation down to 0.6 V output.

Use Value: Enables reliable 300 kHz operation with <1.5 mV line regulation and 32 mV load regulation, critical for digital load transients.

DSP Core Power Supplies

Set-Top Box Main Rails

Use Scenario: Generating 1.2 V or 1.8 V for TI C6000 or ADI SHARC DSPs from 5.5 V or 12 V intermediate bus.

IC Role / Device Role / Timing Role: Constant on-time buck controller ensuring minimal output voltage deviation during rapid load steps.

Use Value: Delivers <1% output voltage deviation under 10 A/µs load transients due to valley current-loop bandwidth optimization.

Use Scenario: Converting 12 V input to 3.3 V or 5 V for SoC, memory, and audio subsystems in consumer STBs.

IC Role / Device Role / Timing Role: High-efficiency synchronous controller supporting light-load efficiency via optimized gate drive timing.

Use Value: Maintains >85% efficiency at 100 mA load (V_OUT = 5 V) with 190–280 µA shutdown current, reducing standby power.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM5116PWPR	Wide-input (3–75 V), adjustable frequency (50–750 kHz), no integrated bootstrap diode, requires external sense resistor.	Targets higher-input industrial and automotive applications; lacks valley current mode and precharged-load support.	Choose LM5116PWPR for >20 V inputs or where external sense resistor is acceptable for higher current-sense accuracy.
TPS54620RGYT	Fixed 600 kHz frequency, integrated FETs (not controller), 4.5–17 V input, 0.6 V reference, no valley current mode.	Designed for compact, low-component-count designs; not suitable for high-current or custom power stage implementations.	Choose TPS54620RGYT when board space is constrained and integrated FETs meet current requirements (≤6 A).

Compared with LM5116PWPR and TPS54620RGYT, ADP1870ARMZ-0.3-R7 uniquely combines valley current-mode control, no external sense resistor, integrated bootstrap diode, and precharged-load startup-making it optimal for high-efficiency, high-reliability 300 kHz POL designs requiring design flexibility and minimal external components.

Availability

ADP1870ARMZ-0.3-R7 is available at Aetrix Electronics and suitable for telecom power modules, server point-of-load supplies, and DSP core power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature extremes.

Supply support for ADP1870ARMZ-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 with precision power, signal chain, and RF solutions.

The ADP1870/ADP1871 product line delivers versatile synchronous buck controllers optimized for high-efficiency, low-voltage POL conversion in telecom, server, and computing applications-emphasizing valley current-mode stability, wide input range, and minimal external component count.

FAQ

What is the switching frequency of the ADP1870ARMZ-0.3-R7?

The ADP1870ARMZ-0.3-R7 is factory-configured for a nominal 300 kHz switching frequency, with typical variation of ±10% over temperature and load. Measured frequency remains within 270–330 kHz across −40°C to +125°C junction temperature and full load range, as confirmed in Figures 26–28 of the Rev. B datasheet.

Does the ADP1870ARMZ-0.3-R7 require an external current-sense resistor?

No, the ADP1870ARMZ-0.3-R7 does not require an external current-sense resistor. It implements valley current-mode sensing using the voltage drop across the low-side MOSFET's R_DS(on), with gain programmable via a resistor from DRVL to PGND-enabling accurate overcurrent protection without added component cost or board area.

Can the ADP1870ARMZ-0.3-R7 start up into a precharged output?

Yes, the ADP1870ARMZ-0.3-R7 supports startup into a precharged output. Its soft-start circuitry includes reverse-current protection that prevents current flow from output to input during initial power-up, making it suitable for hot-swap and redundant power supply applications where output capacitance may already be charged.

What is the function of the DRVL pin on the ADP1870ARMZ-0.3-R7?

The DRVL pin on the ADP1870ARMZ-0.3-R7 serves two functions: (1) it outputs the gate drive signal for the external low-side N-channel MOSFET, and (2) it sets the current-sense amplifier gain via a resistor connected from DRVL to PGND-e.g., 47 kΩ yields 3 V/V gain, enabling precise valley current-limit threshold adjustment.

Is the ADP1870ARMZ-0.3-R7 pin-compatible with other members of the ADP1870/ADP1871 family?

Yes, the ADP1870ARMZ-0.3-R7 shares identical pinout and package (10-lead MSOP) with all ADP1870/ADP1871 variants-including ADP1870ARMZ-0.6-R7 and ADP1870ARMZ-1.0-R7-allowing frequency upgrades via simple part replacement without PCB redesign, provided external compensation and inductor values are re-verified for the new frequency.

ADP1870ARMZ-0.3-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):: 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-MSOP

ADP1870ARMZ-0.3-R7 FAQ

1.How can I place an order for ADP1870ARMZ-0.3-R7 through Aetrix?

Please submit a Request for Quotation (RFQ) for ADP1870ARMZ-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 ADP1870ARMZ-0.3-R7 reliable?

The price and inventory of ADP1870ARMZ-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 ADP1870ARMZ-0.3-R7 is usually 5 days.

3.What payment methods are accepted for ADP1870ARMZ-0.3-R7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1870ARMZ-0.3-R7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ADP1870ARMZ-0.3-R7?

ADP1870ARMZ-0.3-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADP1870ARMZ-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 ADP1870ARMZ-0.3-R7?

For technical support, including ADP1870ARMZ-0.3-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1870ARMZ-0.3-R7 requirements.

6.How does Aetrix verify that ADP1870ARMZ-0.3-R7 is sourced from the original manufacturer or authorized distributors?

All ADP1870ARMZ-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 ADP1870ARMZ-0.3-R7 meets industry standards.

7.What is the process for return or replacement of ADP1870ARMZ-0.3-R7?

All ADP1870ARMZ-0.3-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1870ARMZ-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 ADP1870ARMZ-0.3-R7 part is unused and in its original packaging.

Return procedure for ADP1870ARMZ-0.3-R7:

1.Submit a request within 90 days.

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

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