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Analog Devices Inc. ADP1871ARMZ-0.3-R7
- Part No.:
- ADP1871ARMZ-0.3-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADP1871ARMZ-0.3-R7.pdf
- Description:
- IC REG CTRLR BUCK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:995
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Product details
Overview
ADP1871ARMZ-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 operates from 2.95 V to 20 V input, delivers ≥0.6 V output with ±1.0% reference accuracy, supports all-N-channel MOSFET power stages, and includes 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-0.3-R7 datasheet, ADP1871ARMZ-0.3-R7 pinout, ADP1871ARMZ-0.3-R7 application, or ADP1871ARMZ-0.3-R7 equivalent, key selection considerations include its 300 kHz switching frequency, PSM capability, valley current-limit programming via DRVL resistor, thermal shutdown at 155°C, and MSOP-10 package compatibility with precharged load startup.
Technical Context
The ADP1871ARMZ-0.3-R7 uses a pseudo-fixed-frequency constant on-time architecture combined with valley current-mode sensing to ensure fast transient response and stable regulation across wide duty cycles. Its valley current detection enables reliable operation down to 0.6 V output while maintaining accurate current limiting without external sense resistors.
It integrates an internal 5 V LDO (VREG) for gate driver biasing, features precision enable threshold (245–330 mV), and implements hiccup-mode short-circuit protection with 6 ms timing. The PSM version skips pulses under light loads to reduce switching losses while maintaining regulation.
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 5 V, 12 V, and 16.5 V sources. |
| Switching Frequency | 300 kHz - fixed nominal frequency enabling predictable EMI filtering and inductor sizing (e.g., 1.2 µH for 1.8 V/15 A). |
| Reference Voltage | 0.6 V ±1.0% - enables precise low-voltage regulation for modern DSP/FPGA cores with tight tolerance requirements. |
| Power Saving Mode | Enabled - reduces quiescent current and improves light-load efficiency via pulse-skipping without output voltage droop. |
| Thermal Shutdown | 155°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design in enclosed systems. |
| Soft Start Time | 3.0 ms - limits inrush current during startup and prevents reverse current flow into precharged outputs. |
| Enable Threshold | 245–330 mV logic-high with 37 mV hysteresis - allows clean, noise-immune system-level power sequencing control. |
Pinout & Package
ADP1871ARMZ-0.3-R7 is housed in a 10-lead MSOP package with exposed pad (must be connected to GND). Thermal resistance θJA is 171.7°C/W on 4-layer board, supporting moderate-power applications up to ~15 A with proper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side MOSFET drain connection | Primary input rail connection; must decouple with ≥22 µF ceramic capacitor to PGND. |
| COMP/EN | Error amplifier output / Enable input | Pulled low (<285 mV) disables controller; open or >330 mV enables regulation with soft-start initiation. |
| FB | Feedback node for output voltage sensing | Connects to resistor divider from VOUT; sets regulated output via 0.6 V internal reference. |
| GND | Analog ground reference | Separate from PGND; connects sensitive analog circuitry (error amp, reference) to minimize noise coupling. |
| VREG | Internal 5 V bias regulator output | Supplies gate drivers and internal logic; bypass with 1 µF to PGND + 0.1 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 MOSFET source and DRVL driver; must be low-inductance copper pour tied to VIN capacitor ground. |
| DRVH | High-side gate driver output | Drives upper N-MOSFET gate; requires BST-SW bootstrap capacitor (typically 0.1 µF) for high-side floating drive. |
| SW | Switch node | Connection between high- and low-side MOSFETs; critical for EMI and layout; ties to inductor and BST capacitor. |
| BST | Bootstrap supply for high-side driver | Internally connected to VREG via diode; external capacitor from BST to SW provides floating gate drive voltage. |
Key Features
| Feature | Design Value |
|---|---|
| No current-sense resistor required | Valley current sensing via DRVL pin eliminates external RSENSE, reducing BOM cost and power loss. |
| Integrated bootstrap diode | Reduces external component count by embedding the charge-pump diode between VREG and BST pins. |
| Starts into precharged load | Soft-start circuit prevents reverse current flow when VOUT is already charged, enabling hot-swap capability. |
| Resistor-programmable current-sense gain | Four gain options (e.g., 3 V/V, 6 V/V) set by single resistor from DRVL to PGND for flexible current-limit tuning. |
| Thermal overload and short-circuit protection | Hiccup-mode current limiting with 6 ms off-time prevents MOSFET destruction during sustained overloads. |
Applications
| Telecom Point-of-Load Supply | DSP Core Power |
|---|---|
Use Scenario: Regulating 1.8 V or 0.8 V from 12 V or 48 V intermediate bus in base station line cards. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-current, low-voltage rail with fast transient response to burst-mode DSP loads. Use Value: 300 kHz switching and valley current mode deliver <±1% output accuracy across −40°C to +125°C junction temperature. | Use Scenario: Powering TI C6000 or Analog Devices SHARC processors requiring tightly regulated sub-1 V core supplies. IC Role / Device Role / Timing Role: Primary voltage regulator IC providing dynamic voltage scaling support and PSM for standby modes. Use Value: Power-saving mode achieves >85% efficiency at 10 mA load (VIN = 13 V, VOUT = 0.8 V), extending idle time in battery-backed systems. |
| Mid-to-High-End Server VRM | Set-Top Box SoC Supply |
Use Scenario: Generating 1.0 V or 1.2 V CPU/GPU rails in enterprise servers with 5 V or 12 V input. IC Role / Device Role / Timing Role: Controller in discrete 2-phase or single-phase buck stage driving Infineon BSC042N03MS dual N-MOSFETs. Use Value: Integrated 5 V VREG powers gate drivers directly, eliminating need for external bias supply and simplifying layout. | Use Scenario: Delivering 3.3 V or 1.8 V to Broadcom or MediaTek SoCs in cable/satellite STBs with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-frequency buck controller enabling deterministic EMI filter design at 300 kHz fundamental. Use Value: Constant on-time control ensures <100 ns load-step response time, preventing brownout during video decode bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54620RGYT | 600 kHz fixed frequency, no PSM, requires external current-sense resistor, 4.5–17 V input. | Lacks light-load efficiency optimization; better suited for constant-load industrial applications than burst-mode DSP loads. | Select when higher switching frequency and external sensing are acceptable trade-offs for tighter output ripple control. |
| ISL85412FRTZ-T7A | 1.2 MHz frequency, integrated MOSFETs (buck converter), 3–18 V input, 0.6 V reference. | Monolithic solution eliminates external FETs but limits max current to 2 A and thermal headroom vs. discrete controller + FETs. | Choose for space-constrained designs where 2 A output and simplified layout outweigh need for >10 A scalability. |
Compared with TPS54620RGYT and ISL85412FRTZ-T7A, ADP1871ARMZ-0.3-R7 uniquely combines 300 kHz operation, PSM, valley current sensing without RSENSE, and robust 155°C thermal protection-making it optimal for thermally demanding, variable-load telecom and server POL designs.
Availability
ADP1871ARMZ-0.3-R7 is available at Aetrix Electronics and suitable for telecom point-of-load supplies, DSP core power, and mid-to-high-end server VRMs requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across −40°C to +125°C.
Supply support for ADP1871ARMZ-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 DSP applications requiring precision low-voltage regulation and robust thermal management.
FAQ
What is the switching frequency of the ADP1871ARMZ-0.3-R7?
The ADP1871ARMZ-0.3-R7 is factory-configured for a nominal 300 kHz switching frequency. This value is fixed per the "-0.3" suffix and remains stable across load, input voltage, and temperature-measured within ±10% at no load and varying less than ±5% under full load per Figure 26–28 in the datasheet. It enables optimized inductor sizing and EMI filter design for mid-power POL applications.
Does the ADP1871ARMZ-0.3-R7 support precharged output startup?
Yes, the ADP1871ARMZ-0.3-R7 supports startup into a precharged output through its internally fixed 3.0 ms soft-start period and reverse-current protection circuitry. During soft start, the controller prevents low-side MOSFET turn-on until the FB voltage rises above the 0.6 V reference, avoiding destructive reverse current flow from VOUT back into the input stage-a critical feature for hot-swap and redundant power systems.
How is current limiting configured on the ADP1871ARMZ-0.3-R7?
Current limiting on the ADP1871ARMZ-0.3-R7 is configured via a resistor connected from the DRVL pin to PGND, which sets the current-sense amplifier gain. For example, a 47 kΩ ±1% resistor yields 3.0 V/V gain, while 22 kΩ gives 6.0 V/V. This eliminates the need for an external current-sense resistor and allows precise, adjustable valley current limit thresholds without additional components or PCB area.
What is the role of the VREG pin on the ADP1871ARMZ-0.3-R7?
The VREG pin on the ADP1871ARMZ-0.3-R7 outputs a regulated 5 V supply (2.75–5.5 V range) used exclusively to bias internal circuitry and power the high- and low-side gate drivers. It must be bypassed with a 1 µF capacitor to PGND and a 0.1 µF capacitor to GND. External loading is prohibited-as specified in the datasheet-to maintain regulation accuracy and prevent instability in gate drive performance.
Is the ADP1871ARMZ-0.3-R7 pin-compatible with other ADP187x variants?
Yes, the ADP1871ARMZ-0.3-R7 shares identical pinout and package (10-lead MSOP) with all ADP1870/ADP1871 variants-including ADP1871ARMZ-0.6-R7 and ADP1871ARMZ-1.0-R7. Differences are limited to internal frequency configuration and presence of PSM (ADP1871 only); no PCB layout changes are needed when upgrading or substituting within the same package option.
ADP1871ARMZ-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
ADP1871ARMZ-0.3-R7 FAQ
1.How can I place an order for ADP1871ARMZ-0.3-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1871ARMZ-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 ADP1871ARMZ-0.3-R7 reliable?
The price and inventory of ADP1871ARMZ-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 ADP1871ARMZ-0.3-R7 is usually 5 days.
3.What payment methods are accepted for ADP1871ARMZ-0.3-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1871ARMZ-0.3-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1871ARMZ-0.3-R7?
ADP1871ARMZ-0.3-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1871ARMZ-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 ADP1871ARMZ-0.3-R7?
For technical support, including ADP1871ARMZ-0.3-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1871ARMZ-0.3-R7 requirements.
6.How does Aetrix verify that ADP1871ARMZ-0.3-R7 is sourced from the original manufacturer or authorized distributors?
All ADP1871ARMZ-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 ADP1871ARMZ-0.3-R7 meets industry standards.
7.What is the process for return or replacement of ADP1871ARMZ-0.3-R7?
All ADP1871ARMZ-0.3-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1871ARMZ-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 ADP1871ARMZ-0.3-R7 part is unused and in its original packaging.
Return procedure for ADP1871ARMZ-0.3-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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