My Inquiry
My Account
Analog Devices Inc. ADP1870ACPZ-1.0-R7
- Part No.:
- ADP1870ACPZ-1.0-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
ADP1870ACPZ-1.0-R7.pdf
- Description:
- IC REG CTRLR BUCK 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADP1870ACPZ-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 supports 3.25 V to 20 V input, delivers regulated output down to 0.6 V with ±1.0% reference accuracy, operates at 1.0 MHz switching frequency, and drives all-N-channel MOSFET power stages in telecom POL supplies.
For engineers reviewing the ADP1870ACPZ-1.0-R7 datasheet, ADP1870ACPZ-1.0-R7 pinout, ADP1870ACPZ-1.0-R7 application, or ADP1870ACPZ-1.0-R7 equivalent, key selection criteria include its 1.0 MHz fixed-frequency operation, integrated bootstrap diode, valley-current sensing without external sense resistor, thermal shutdown at 155°C, and compatibility with precharged load startup.
Technical Context
The ADP1870ACPZ-1.0-R7 uses a pseudo-fixed-frequency constant on-time architecture combined with valley current-mode control to maintain stability and transient response across wide duty-cycle ranges. Its minimum on-time of 60 ns (typ) at VIN = 20 V enables low-output-voltage regulation (e.g., 0.6 V) even at high input voltages.
It integrates an internal 5 V LDO (VREG) for biasing, a precision enable input with 245–330 mV threshold, and programmable current-sense gain via DRVL-to-PGND resistor. The device features hiccup-mode short-circuit protection and thermal overload shutdown with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.0 MHz - Enables compact magnetics and high-density layout for space-constrained POL applications. |
| Input Voltage Range | 3.25 V to 20 V - Supports 12 V intermediate bus and wide-input industrial/compute rails. |
| Output Voltage Accuracy | ±1.0% at FB pin (600 mV reference) - Ensures tight regulation for DSP/FPGA core supplies. |
| Min On-Time | 60 ns (typ) - Allows stable 0.6 V output at 20 V input (3% duty cycle), critical for low-VOUT applications. |
| Thermal Shutdown | 155°C with 15°C hysteresis - Protects against sustained overload while enabling recovery after cooling. |
| VREG Output | 5 V ±10% (2.75–5.5 V range) - Powers internal circuitry and gate drivers; not for external loading. |
| Enable Threshold | 245–330 mV logic-high level - Provides precise system-level power sequencing control. |
Pinout & Package
ADP1870ACPZ-1.0-R7 is housed in a 10-lead LFCSP package (3 mm × 3 mm × 0.8 mm) with exposed pad thermally connected to GND. The package supports high-power density and enhanced thermal performance (θJA = 40°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side MOSFET drain connection | Primary input rail connection; supports up to 20 V with UVLO at 2.65 V rising. |
| COMP/EN | Error amplifier output / Enable input | Active-low enable: <285 mV disables IC; also provides loop compensation node. |
| FB | Feedback voltage sense input | Connects to resistor divider; regulates output by comparing to 600 mV internal reference. |
| GND | Analog ground reference | Reference for sensitive analog blocks; must be separated from PGND per layout guidelines. |
| VREG | Internal LDO output | 5 V bias supply for controllers/drivers; bypass with 1 µF to PGND + 0.1 µF to GND. |
| DRVL | Low-side N-MOSFET gate driver | Also sets current-sense gain via external resistor to PGND (e.g., 100 kΩ → 24 V/V gain). |
| PGND | Power ground return | Return path for low-side driver and MOSFET source; separate from analog GND. |
| DRVH | High-side N-MOSFET gate driver | Driven from BST node; requires external bootstrap capacitor between BST and SW. |
| SW | Switch node | Connection point between high- and low-side MOSFETs; ties to inductor and bootstrap cap. |
| BST | Bootstrap supply for high-side driver | Internally rectified from VREG; requires external capacitor to SW for high-side gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| No external current-sense resistor | Valley current sensing via DRVL pin eliminates Rsense losses and PCB area, improving efficiency at light loads. |
| Integrated bootstrap diode | Reduces external component count and improves reliability vs. discrete Schottky solutions in high-frequency designs. |
| Starts into precharged load | Prevents reverse current flow during soft-start, enabling safe hot-swap and inrush-limited power-up in modular systems. |
| Resistor-programmable current-sense gain | Four gain options (11–26 V/V) via single DRVL-to-PGND resistor allow optimization for different MOSFET RDS(on) values. |
| Constant on-time + valley current mode | Combines fast transient response (COT) with inherent current-limit protection and stable operation at ultra-low duty cycles. |
Applications
| Telecom POL Supply | DSP Core Power |
|---|---|
Use Scenario: Point-of-load regulation from 12 V intermediate bus to 1.8 V/3 A for baseband processors in 4G/5G radio units. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-frequency (1.0 MHz), high-efficiency conversion with tight output accuracy. Use Value: Achieves >90% efficiency at 1 A–10 A loads (per Figure 11), minimizing thermal stress in sealed RF enclosures. | Use Scenario: Providing dynamically scaled 0.8 V core voltage to multi-core DSPs in network packet processors. IC Role / Device Role / Timing Role: Valley-current-mode controller delivering fast load-step response (<10 µs) and sub-1% output deviation. Use Value: Minimum 60 ns on-time enables stable 0.8 V output from 13 V input (6.2% duty cycle), verified across −40°C to +125°C. |
| Server VRM Auxiliary Rail | Industrial FPGA I/O Bank Supply |
Use Scenario: Generating 5 V @ 6 A auxiliary rail for memory interfaces and PCIe slots in mid-range servers. IC Role / Device Role / Timing Role: High-current synchronous controller operating at 600 kHz (ADP1870ARMZ-0.6 variant) or 1.0 MHz (this part) for layout flexibility. Use Value: Integrated thermal shutdown (155°C) and hiccup-mode protection prevent catastrophic failure during sustained overloads in unventilated chassis. | Use Scenario: Delivering 3.3 V @ 4 A to FPGA I/O banks in programmable logic controllers with wide ambient temperature range. IC Role / Device Role / Timing Role: Robust buck controller supporting −40°C to +125°C junction operation and precise enable sequencing. Use Value: Precision enable threshold (245–330 mV) ensures deterministic power-up order relative to FPGA configuration signals. |
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 | Fixed 600 kHz frequency; no valley current sensing; requires external current-sense resistor. | Lower cost for less demanding transient requirements; lacks precharged-load start capability. | Select when BOM cost priority outweighs ultra-fast transient response and minimum on-time constraints. |
| ISL85415EVAL1Z | Integrated power stage (MOSFETs + controller); 1.5 MHz max frequency; no programmable current-sense gain. | Reduced design effort for medium-power (≤5 A) applications; higher solution size due to integrated FETs. | Select when board space is less constrained and simplified layout outweighs discrete FET flexibility. |
Compared with TPS54620RGYT and ISL85415EVAL1Z, ADP1870ACPZ-1.0-R7 uniquely combines 1.0 MHz operation, valley-current sensing without Rsense, and 60 ns minimum on-time-enabling smaller inductors, higher efficiency at light loads, and reliable low-VOUT regulation in thermally demanding environments.
Availability
ADP1870ACPZ-1.0-R7 is available at Aetrix Electronics and suitable for telecom POL supplies, DSP core power, server auxiliary rails, and industrial FPGA I/O banks requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for ADP1870ACPZ-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.
The ADP1870/ADP1871 product line was designed specifically for high-efficiency, high-frequency synchronous buck control in space- and thermal-constrained computing and networking infrastructure, emphasizing fast transient response and robust protection features.
FAQ
What is the switching frequency of the ADP1870ACPZ-1.0-R7?
The ADP1870ACPZ-1.0-R7 is factory-configured for 1.0 MHz nominal switching frequency, with typical variation of ±10% across temperature and load. This frequency is fixed per the "-1.0" suffix and does not require external programming resistors or capacitors. Measured data (Figure 25) confirms stable operation from 13 V to 16.5 V input at 1.0 MHz across −40°C to +125°C.
Does the ADP1870ACPZ-1.0-R7 require an external current-sense resistor?
No, the ADP1870ACPZ-1.0-R7 does not require an external current-sense resistor. It implements valley current-mode sensing using the low-side MOSFET's RDS(on) as the sense element, with gain set by a resistor from DRVL to PGND. This eliminates power loss and PCB area associated with discrete sense resistors, as confirmed in the General Description and Table 1 "Current-Sense Amplifier Gain" section.
Can the ADP1870ACPZ-1.0-R7 start up into a precharged output?
Yes, the ADP1870ACPZ-1.0-R7 supports startup into a precharged output. Its internal soft-start circuit includes reverse-current protection that prevents current flow from output to input during ramp-up. This feature is explicitly documented in the General Description and validated in application circuits (e.g., Figure 1), making ADP1870ACPZ-1.0-R7 suitable for hot-swap and modular power systems.
What is the minimum output voltage supported by the ADP1870ACPZ-1.0-R7?
The ADP1870ACPZ-1.0-R7 supports a minimum regulated output voltage of 0.6 V, set by its internal 600 mV feedback reference with ±1.0% accuracy. This is confirmed in the Features list and validated in Figures 13, 16, and 19 showing output accuracy down to 0.8 V (and extrapolated to 0.6 V), with stable regulation across full temperature range and load conditions.
Is the ADP1870ACPZ-1.0-R7 pin-compatible with other ADP1870 variants?
Yes, the ADP1870ACPZ-1.0-R7 shares identical pinout and package (10-lead LFCSP) with all ADP1870/ADP1871 variants, including ADP1870ARMZ-0.3 and ADP1870ARMZ-0.6. Frequency selection is determined by internal laser trimming-not external components-so PCB layout is fully reusable across the family, as stated in the Pin Configuration section and Ordering Guide.
ADP1870ACPZ-1.0-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):
- 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-LFCSP-WD (3x3)
ADP1870ACPZ-1.0-R7 FAQ
1.How can I place an order for ADP1870ACPZ-1.0-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1870ACPZ-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 ADP1870ACPZ-1.0-R7 reliable?
The price and inventory of ADP1870ACPZ-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 ADP1870ACPZ-1.0-R7 is usually 5 days.
3.What payment methods are accepted for ADP1870ACPZ-1.0-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1870ACPZ-1.0-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1870ACPZ-1.0-R7?
ADP1870ACPZ-1.0-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1870ACPZ-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 ADP1870ACPZ-1.0-R7?
For technical support, including ADP1870ACPZ-1.0-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1870ACPZ-1.0-R7 requirements.
6.How does Aetrix verify that ADP1870ACPZ-1.0-R7 is sourced from the original manufacturer or authorized distributors?
All ADP1870ACPZ-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 ADP1870ACPZ-1.0-R7 meets industry standards.
7.What is the process for return or replacement of ADP1870ACPZ-1.0-R7?
All ADP1870ACPZ-1.0-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1870ACPZ-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 ADP1870ACPZ-1.0-R7 part is unused and in its original packaging.
Return procedure for ADP1870ACPZ-1.0-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADP1870ACPZ-1.0-R7 Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
