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Analog Devices Inc. ADP1870ARMZ-1.0-R7
- Part No.:
- ADP1870ARMZ-1.0-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADP1870ARMZ-1.0-R7.pdf
- Description:
- IC REG CTRLR BUCK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,840
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Product details
Overview
ADP1870ARMZ-1.0-R7 from Analog Devices is a synchronous buck controller implementing constant on-time and valley current-mode control for high-efficiency DC/DC conversion in 12 V input POL supplies. It operates at 1.0 MHz switching frequency, supports 3.25 V to 20 V input, regulates down to 0.6 V output with ±1.0% reference accuracy, and drives all-N-channel MOSFET power stages in telecom and server core power applications.
For engineers reviewing the ADP1870ARMZ-1.0-R7 datasheet, ADP1870ARMZ-1.0-R7 pinout, ADP1870ARMZ-1.0-R7 application, or ADP1870ARMZ-1.0-R7 equivalent, key selection criteria include its 1.0 MHz fixed-frequency operation, integrated bootstrap diode, valley current-sense architecture, thermal shutdown at 155°C, and MSOP-10 package compatibility with high-density PCB layouts.
Technical Context
The ADP1870ARMZ-1.0-R7 uses a pseudo-fixed-frequency constant on-time control scheme with valley current-mode sensing to maintain stability and transient response across wide duty-cycle ranges. Its architecture enables regulation at low output voltages (0.6 V) while supporting high-side N-MOSFETs via an integrated bootstrap diode and internal 5 V LDO bias regulator.
It implements precision enable logic with 245–330 mV threshold and 37 mV hysteresis, soft-start with 3.0 ms duration, and hiccup-mode short-circuit protection. The device does not include power-saving mode (PSM), distinguishing it from the ADP1871 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.0 MHz - Enables compact magnetics and high transient response in space-constrained POL designs. |
| Input Voltage Range | 3.25 V to 20 V - Supports 12 V intermediate bus architectures with margin for ripple and drop. |
| Output Voltage Accuracy | ±1.0% at 0.6 V reference - Ensures tight regulation for DSP/FPGA core rails requiring sub-1% tolerance. |
| Min On-Time | 60 ns (typ) at VIN = 20 V - Allows stable operation at ultra-low duty cycles (e.g., 0.6 V out from 12 V in ≈ 5%). |
| Thermal Shutdown | 155°C threshold with 15°C hysteresis - Provides robust overtemperature protection without latch-up. |
| Driver Rise/Fall Times | DRVH: 25 ns rise / 11 ns fall; DRVL: 18 ns rise / 16 ns fall - Minimizes switching losses in high-frequency N-MOSFET gate drive. |
| Integrated Bootstrap Diode | 22 Ω channel impedance - Eliminates external bootstrap diode, reducing BOM count and layout complexity. |
Pinout & Package
ADP1870ARMZ-1.0-R7 is housed in a 10-lead MSOP package with exposed pad thermally connected to GND. Pin 1 (VIN) connects to upper-MOSFET drain; Pin 9 (SW) is the switch-node connection; Pin 10 (BST) requires external BST capacitor to SW; Pin 5 (VREG) supplies internal bias at 5 V (not for external loading).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | High-side input supply | Connects to drain of upper N-MOSFET; accepts 3.25–20 V with UVLO at 2.65 V. |
| COMP/EN (Pin 2) | Error amplifier output / enable input | Logic-high enable threshold 245–330 mV; clamps COMP between 0.47 V and 2.55 V during startup. |
| FB (Pin 3) | Feedback node | Senses output voltage divider; 0.6 V reference with ±1.0% accuracy over −40°C to +125°C. |
| GND (Pin 4) | Analog ground reference | Reference for error amp and sensitive analog circuitry; separate from PGND to minimize noise coupling. |
| VREG (Pin 5) | Internal LDO output | 5 V ±0.5 V regulated supply for internal logic and gate drivers; must not be externally loaded. |
| DRVL (Pin 6) | Low-side gate driver output | Drives lower N-MOSFET gate; also sets current-sense gain via resistor to PGND (e.g., 47 kΩ → 3 V/V). |
| PGND (Pin 7) | Power ground return | Return path for low-side driver and lower MOSFET source; must be tied to power plane near SW node. |
| DRVH (Pin 8) | High-side gate driver output | Drives upper N-MOSFET gate; referenced to SW node; 2.25 Ω source / 0.7 Ω sink resistance. |
| SW (Pin 9) | Switch node | Connection point between upper and lower MOSFETs; ties to BST capacitor and inductor. |
| BST (Pin 10) | Bootstrap supply | Connected to BST capacitor (CBST) between BST and SW; powers high-side driver during on-time. |
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 | Uses low-side MOSFET RDS(on) for current sensing, reducing power loss and component count. |
| Integrated bootstrap diode | Eliminates need for external Schottky diode, simplifying layout and improving reliability in 1.0 MHz designs. |
| Precision enable input | 245–330 mV threshold with 37 mV hysteresis ensures clean, noise-immune power sequencing. |
| Starts into precharged load | Prevents reverse current flow during soft start, protecting downstream capacitors and loads. |
Applications
| Telecom Point-of-Load Supply | DSP Core Power |
|---|---|
Use Scenario: Regulating 12 V intermediate bus to 1.8 V for baseband processor cores in 5G remote radio units. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-efficiency, high-transient-response DC/DC conversion with 1.0 MHz switching. Use Value: Achieves >90% efficiency at 10 A load (VIN = 13 V, VOUT = 1.8 V) while maintaining ±1% output accuracy across temperature. | Use Scenario: Providing tightly regulated 0.8 V core supply for multi-core digital signal processors in network edge devices. IC Role / Device Role / Timing Role: Valley current-mode controller enabling stable 0.8 V output from 12 V input with minimal off-time limitation. Use Value: Delivers <±1.0% output voltage deviation over −40°C to +125°C junction range, critical for DSP timing margins. |
| Mid-Range Server VRM | Set-Top Box SoC Power |
Use Scenario: Generating 5 V intermediate rail from 12 V backplane for memory and I/O subsystems in rack-mounted servers. IC Role / Device Role / Timing Role: High-frequency synchronous controller driving discrete N-MOSFETs with integrated bootstrap diode. Use Value: Supports 1.0 MHz operation with 60 ns minimum on-time, allowing small 0.9 µH inductors and fast load-step response. | Use Scenario: Delivering 1.2 V to application SoCs in consumer set-top boxes with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Constant on-time buck controller providing jitter-free regulation and precise soft-start sequencing. Use Value: 3.0 ms internal soft-start limits in-rush current and prevents output voltage overshoot during cold boot. |
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-1.0-R7 | Includes power-saving mode (PSM) for light-load efficiency; identical pinout, frequency, and specs otherwise. | Preferred for battery-backed or always-on systems where light-load efficiency matters (e.g., standby power <100 mW). | Select ADP1871ARMZ-1.0-R7 only if PSM functionality is required; ADP1870ARMZ-1.0-R7 is optimal for full-load efficiency and simplicity. |
| TPS54620RGYR | 600 kHz max frequency, integrated FETs (not controller), no valley current mode, different enable threshold (1.215 V). | Used in lower-power, cost-sensitive applications where integrated solution suffices and 1.0 MHz is not required. | Not pin-compatible; requires redesign. Choose only when integrated FETs and reduced external component count outweigh frequency and topology requirements. |
Compared with ADP1871ARMZ-1.0-R7, the ADP1870ARMZ-1.0-R7 omits PSM but offers identical 1.0 MHz operation, valley current sensing, and thermal performance-making it preferable for continuous high-load applications. Versus TPS54620RGYR, it provides higher frequency, discrete-FET flexibility, and superior low-duty-cycle capability, at the cost of added external components.
Availability
ADP1870ARMZ-1.0-R7 is available at Aetrix Electronics and suitable for telecom point-of-load supplies, DSP core power, and mid-range server VRMs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADP1870ARMZ-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 computing markets.
The ADP1870/ADP1871 product line delivers high-frequency synchronous buck controllers optimized for 12 V input POL applications in telecom infrastructure, servers, and high-end consumer electronics-emphasizing efficiency, accuracy, and design simplicity.
FAQ
What is the switching frequency of the ADP1870ARMZ-1.0-R7?
The ADP1870ARMZ-1.0-R7 is factory-configured for 1.0 MHz nominal switching frequency. This value is fixed per part number and verified across temperature (−40°C to +125°C) and input voltage (3.25 V to 20 V). Typical variation is ±10%, with measured values ranging from ~900 kHz to ~1100 kHz depending on load and VIN.
Does the ADP1870ARMZ-1.0-R7 support power-saving mode (PSM)?
No, the ADP1870ARMZ-1.0-R7 does not include power-saving mode. PSM is exclusive to the ADP1871 variant (e.g., ADP1871ARMZ-1.0-R7). The ADP1870ARMZ-1.0-R7 operates in forced PWM mode at all loads, ensuring consistent frequency and predictable EMI behavior-ideal for noise-sensitive applications.
What package type is used for the ADP1870ARMZ-1.0-R7?
The ADP1870ARMZ-1.0-R7 is packaged in a 10-lead MSOP (Mini Small Outline Package) with exposed thermal pad. This surface-mount package measures 3 mm × 3 mm × 1.1 mm and requires soldering the exposed pad directly to a GND plane for thermal and electrical integrity.
Can the ADP1870ARMZ-1.0-R7 start into a precharged output?
Yes, the ADP1870ARMZ-1.0-R7 supports startup into a precharged output. Its internal circuitry prevents reverse current flow during soft start by disabling the high-side driver until the FB voltage rises above the 0.6 V reference, protecting downstream capacitors and loads from damage.
What is the minimum output voltage supported by the ADP1870ARMZ-1.0-R7?
The ADP1870ARMZ-1.0-R7 supports a minimum output voltage of 0.6 V, set by its internal reference voltage with ±1.0% accuracy over temperature. This enables direct regulation for modern low-voltage DSP, FPGA, and ASIC cores without external resistive dividers compromising accuracy.
ADP1870ARMZ-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
ADP1870ARMZ-1.0-R7 FAQ
1.How can I place an order for ADP1870ARMZ-1.0-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1870ARMZ-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 ADP1870ARMZ-1.0-R7 reliable?
The price and inventory of ADP1870ARMZ-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 ADP1870ARMZ-1.0-R7 is usually 5 days.
3.What payment methods are accepted for ADP1870ARMZ-1.0-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1870ARMZ-1.0-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1870ARMZ-1.0-R7?
ADP1870ARMZ-1.0-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1870ARMZ-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 ADP1870ARMZ-1.0-R7?
For technical support, including ADP1870ARMZ-1.0-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1870ARMZ-1.0-R7 requirements.
6.How does Aetrix verify that ADP1870ARMZ-1.0-R7 is sourced from the original manufacturer or authorized distributors?
All ADP1870ARMZ-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 ADP1870ARMZ-1.0-R7 meets industry standards.
7.What is the process for return or replacement of ADP1870ARMZ-1.0-R7?
All ADP1870ARMZ-1.0-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1870ARMZ-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 ADP1870ARMZ-1.0-R7 part is unused and in its original packaging.
Return procedure for ADP1870ARMZ-1.0-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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