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Analog Devices Inc. ADP1851ACPZ-R7
- Part No.:
- ADP1851ACPZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WQFN Exposed Pad, CSP
- Datasheet:
-
ADP1851ACPZ-R7.pdf
- Description:
- IC REG CTRLR BUCK 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,385
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Product details
Overview
ADP1851ACPZ-R7 from Analog Devices is a wide-input-range, synchronous step-down DC-to-DC controller supporting 2.75 V to 20 V input, 0.6 V to 90% VIN output, and >25 A output current in current mode. It features ±1% output voltage accuracy over −40°C to +125°C, programmable 200 kHz–1.5 MHz switching frequency, and integrated bootstrap diode-used in telecom base station POL supplies requiring precise voltage tracking and sequencing.
For engineers reviewing the ADP1851ACPZ-R7 datasheet, ADP1851ACPZ-R7 pinout, ADP1851ACPZ-R7 application, or ADP1851ACPZ-R7 equivalent, key selection considerations include valley-current-sense architecture for fast digital load response, external slope compensation via RAMP pin, soft-start into precharged loads, precision enable with UVLO hysteresis, and dual-mode operation (current/voltage mode) configurable via DL-to-PGND resistor.
Technical Context
The ADP1851ACPZ-R7 implements emulated peak current mode control using valley-current sensing at SW–PGND, with externally programmable current sense gain (3/6/12 V/V) and adjustable slope compensation via RAMP pin resistor. Its internal 5 V LDO (VCCO) powers gate drivers and logic, while integrated bootstrap diode eliminates external diode requirement.
It supports dynamic mode switching: forced PWM (via SYNC high or clock signal) ensures fixed-frequency CCM operation, while pulse skip mode (SYNC low/floating) improves light-load efficiency. Synchronization accepts external clocks within ±15% of internal fOSC, and tracking is implemented via SS/TRK pin with 6.5 µA internal current source and <±10 mV FB–SS/TRK offset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75 V to 20 V - enables direct use across 3.3 V, 5 V, 12 V, and 19 V intermediate bus rails without pre-regulation. |
| Output Voltage Accuracy | ±1% over −40°C to +125°C - ensures stable regulation under industrial temperature extremes without calibration. |
| Switching Frequency | 200 kHz to 1.5 MHz (resistor-programmable) - allows optimization of size (higher f) vs. efficiency (lower f) and EMI filtering requirements. |
| Max Output Current | >25 A - supports high-power POL conversion when paired with appropriate external MOSFETs and inductor. |
| Control Modes | Current mode (default) or voltage mode (via 100 kΩ DL–PGND) - provides flexibility for noise-sensitive analog loads or fast transient digital loads. |
| Protection Features | OVP (0.63–0.67 V FB), UVP (0.525–0.575 V FB), thermal shutdown (155°C), ILIM (±5 mV threshold), UVLO (2.55–2.75 V rising) - comprehensive fault coverage without external circuitry. |
| Soft Start & Tracking | Programmable via capacitor on SS/TRK (4.6–8.4 µA internal current source) - enables controlled ramp-up and accurate supply sequencing with external rails. |
Pinout & Package
ADP1851ACPZ-R7 is housed in a 4 mm × 4 mm, 16-lead LFCSP package with exposed AGND pad (EPAD) for thermal and grounding integrity. The package is RoHS-compliant and designed for high-density PCB layouts with low-inductance power paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Logic-controlled startup with 0.57–0.68 V threshold and 30 mV hysteresis; supports precision UVLO via resistor divider from VIN. |
| SS/TRK | Soft start / tracking node | 6.5 µA internal current source sets soft-start time; used as tracking reference with <±10 mV offset to FB for supply coordination. |
| FB | Feedback input | 0.6 V reference input with ±100 nA bias current; connects to resistor divider for output voltage setting and OVP/UVP detection. |
| COMP | Error amplifier output | Compensation node for loop stability; requires RC network to FB to tailor phase margin for specific power stage. |
| SYNC | Frequency synchronization input | Accepts external clock (170–1725 kHz); forces PWM mode and locks switching to external source, eliminating beat frequencies. |
| VIN | Main power input | Supplies internal circuitry; bypassed with ≥1 µF ceramic capacitor near pin; powers VCCO LDO when VIN ≥ 5.5 V. |
| VCCO | Internal LDO output | 5.0 V ±0.3 V @ 100 mA; powers gate drivers and logic; remains active during EN low; not for external loads. |
| PGND | Power ground | Low-side current sense reference; separate from AGND; must be connected to low-side MOSFET source and sense resistor. |
| DL | Low-side gate driver | Drives low-side N-MOSFET; current sense gain configured by resistor to PGND (3/6/12 V/V or 0 V/V for voltage mode). |
| SW | Switch node | Connects to high-side drain and low-side source; differential current sensed between SW and PGND for valley-current mode. |
| DH | High-side gate driver | Drives high-side N-MOSFET; 16 ns rise/fall time into 3 nF; supports ≤90% duty cycle at 300 kHz, ≤50% at 1500 kHz. |
| BST | Bootstrap rail | Connected to SW via 0.1–0.22 µF MLCC; internal diode charges BST from VCCO - no external diode required. |
| ILIM | Current limit comparator input | Inverting input referenced to PGND; connects to low-side source for accurate current sensing; blanking period = 100 ns. |
| PGOOD | Open-drain power-good output | Active-high when FB is within 15 mV UVP and 18 mV OVP window; internal 12.5 kΩ pull-up to VCCO; 12 µs delay. |
| RAMP | Slope compensation programming | High-impedance node during disable; 0.2 V operating voltage; resistor to VIN sets slope and adds VIN feedforward. |
| FREQ | Oscillator frequency set | Resistor to AGND programs fOSC (200 kHz–1.5 MHz); tied to AGND = 300 kHz, to VCCO = 600 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Valley-current sensing architecture | Enables fastest step response for digital loads by sensing inductor current at minimum point in switching cycle. |
| Configurable current/voltage mode | Switches control law via single DL–PGND resistor (100 kΩ for voltage mode), reducing noise and crosstalk for analog/sensitive loads. |
| Integrated bootstrap diode | Eliminates external diode requirement, simplifying layout and improving reliability in high-reliability POL applications. |
| Start-up into precharged output | Allows safe initialization when output capacitor is already charged, preventing reverse current flow and system disruption. |
| External slope compensation tuning | RAMP pin enables optimal slope selection per input voltage and inductance, ensuring stable current mode operation across full VIN range. |
| Accurate tracking with <±10 mV offset | Enables tight coordination of multiple rails during power-up/down sequences without additional error amplifiers or DACs. |
Applications
| Telecom Base Station POL | Industrial PLC Power Rails |
|---|---|
Use Scenario: Intermediate bus conversion (12 V or 48 V) to multiple tightly regulated core voltages (e.g., 1.8 V, 3.3 V, 5 V) in macro/micro base station radios. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing sequencing, tracking, and synchronization across distributed power domains. Use Value: ±1% output accuracy and 155°C thermal shutdown ensure uptime in uncooled outdoor enclosures; SYNC pin eliminates beat frequencies between adjacent converters. | Use Scenario: Powering FPGA I/O banks, microcontroller cores, and analog front-ends in modular industrial controllers with strict sequencing requirements. IC Role / Device Role / Timing Role: High-current POL controller delivering >25 A at 1.2 V or 1.8 V with soft-start and tracking to match auxiliary supply ramps. Use Value: SS/TRK pin with 6.5 µA current source enables precise timing alignment with other rails; programmable ILIM protects against short-circuit faults in field-deployed units. |
| Medical Imaging Subsystem | Networking Switch ASIC Supply |
Use Scenario: Generating low-noise, low-ripple bias for CCD/CMOS sensor interfaces and ADC reference supplies in portable ultrasound systems. IC Role / Device Role / Timing Role: Voltage-mode-configured controller minimizing switching noise coupling into sensitive analog signal chains. Use Value: Configurable voltage mode (via 100 kΩ DL–PGND) reduces EMI and crosstalk; ±1% accuracy maintains imaging fidelity across ambient temperature swings. | Use Scenario: High-efficiency, high-transient-response core supply for multi-gigabit Ethernet switch ASICs with bursty traffic patterns. IC Role / Device Role / Timing Role: Current-mode controller with valley sensing and programmable soft-start to handle rapid load steps up to 20 A. Use Value: 85 ns minimum DH on-time and 16 ns gate drive rise time support fast transient recovery; pulse skip mode maintains >85% efficiency at 10% load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5119MT/NOPB | Wider VIN (6–100 V), no integrated bootstrap diode, requires external bootstrap diode and separate VDD regulator. | Targeted at higher-input industrial/motor drives; lacks SS/TRK tracking capability and PGOOD internal pull-up. | Choose LM5119MT/NOPB only if input exceeds 20 V and board space permits external bootstrap components. |
| TPS546D24RQFPR | Fixed 6-pin PMBus interface, integrated MOSFETs (40 A), no RAMP/SYNC pins, supports telemetry but no voltage-mode option. | Designed for plug-and-play digital power systems; lacks analog configurability (frequency, slope, mode) and discrete MOSFET flexibility. | Choose TPS546D24RQFPR only when PMBus monitoring and integrated FETs are mandatory and analog tuning is unnecessary. |
Compared with LM5119MT/NOPB and TPS546D24RQFPR, ADP1851ACPZ-R7 uniquely balances analog configurability (mode, slope, frequency, tracking), integrated bootstrap diode, and wide-input capability below 20 V-making it optimal for high-performance, thermally constrained POL designs where discrete FET selection and sequencing precision are critical.
Availability
ADP1851ACPZ-R7 is available at Aetrix Electronics and suitable for telecom base station POL systems, industrial PLC power rails, medical imaging subsystems, and networking switch ASIC supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADP1851ACPZ-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 precision instrumentation, communications, and industrial markets since 1965.
The ADP1851ACPZ-R7 belongs to Analog Devices' high-efficiency synchronous buck controller product line, engineered for intermediate bus and point-of-load applications demanding sequencing, tracking, and robust protection in space-constrained environments.
FAQ
What is the maximum supported switching frequency for ADP1851ACPZ-R7?
The ADP1851ACPZ-R7 supports a programmable switching frequency up to 1.5 MHz, set by an external resistor on the FREQ pin (e.g., 40.2 kΩ yields ~1500 kHz). At this frequency, the minimum DH on-time is 85 ns and minimum off-time is 345 ns, enabling compact magnetics design while maintaining stability with proper slope compensation.
Can ADP1851ACPZ-R7 operate in voltage mode control?
Yes, ADP1851ACPZ-R7 can be configured for voltage mode control by connecting a 100 kΩ resistor between the DL pin and PGND. This disables the current sense signal path and routes only the emulated ramp to the PWM comparator, reducing switching noise and crosstalk for sensitive analog loads.
Does ADP1851ACPZ-R7 support startup into a precharged output?
Yes, ADP1851ACPZ-R7 supports safe startup into a precharged output. Its valley-current sensing architecture and internal logic prevent reverse current flow during initial turn-on, avoiding potential damage to external MOSFETs or output capacitors-a critical feature for hot-swap and redundant power systems.
What is the role of the RAMP pin on ADP1851ACPZ-R7?
The RAMP pin on ADP1851ACPZ-R7 programs slope compensation magnitude and provides VIN feedforward. A resistor from RAMP to VIN sets the ramp slope, stabilizing current-mode control across input voltage variations. During disable, RAMP is high-impedance, preventing unintended discharge.
How does ADP1851ACPZ-R7 implement power good signaling?
ADP1851ACPZ-R7 implements power good via the open-drain PGOOD pin with an internal 12.5 kΩ pull-up to VCCO. It asserts high when FB voltage remains within 15 mV undervoltage and 18 mV overvoltage thresholds for ≥10 µs, providing a reliable system-level power status signal without external components.
ADP1851ACPZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN 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):
- 2.75V ~ 20V
- Frequency - Switching:
- 200kHz ~ 1.5MHz
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Ramp, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LFCSP (4x4)
ADP1851ACPZ-R7 FAQ
1.How can I place an order for ADP1851ACPZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1851ACPZ-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 ADP1851ACPZ-R7 reliable?
The price and inventory of ADP1851ACPZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1851ACPZ-R7 is usually 5 days.
3.What payment methods are accepted for ADP1851ACPZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1851ACPZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1851ACPZ-R7?
ADP1851ACPZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1851ACPZ-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 ADP1851ACPZ-R7?
For technical support, including ADP1851ACPZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1851ACPZ-R7 requirements.
6.How does Aetrix verify that ADP1851ACPZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADP1851ACPZ-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 ADP1851ACPZ-R7 meets industry standards.
7.What is the process for return or replacement of ADP1851ACPZ-R7?
All ADP1851ACPZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1851ACPZ-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 ADP1851ACPZ-R7 part is unused and in its original packaging.
Return procedure for ADP1851ACPZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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