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Analog Devices Inc. ADP1864AUJZ-R7
- Part No.:
- ADP1864AUJZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
ADP1864AUJZ-R7.pdf
- Description:
- IC REG CTRLR BUCK TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,452
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Product details
Overview
ADP1864AUJZ-R7 from Analog Devices is a constant-frequency, current-mode step-down DC-to-DC controller driving an external P-channel MOSFET to regulate output voltages from 0.8 V to VIN (up to 14 V) with ±1.25% reference accuracy, supporting up to 5 A load current and operating across −40°C to +125°C. It features 580 kHz switching frequency, 100% duty cycle capability for low-dropout operation, and integrated short-circuit/overvoltage/undervoltage protection.
For engineers reviewing the ADP1864AUJZ-R7 datasheet, ADP1864AUJZ-R7 pinout, ADP1864AUJZ-R7 application, or ADP1864AUJZ-R7 equivalent, key selection considerations include its TSOT-6 package, 0.8 V feedback reference, 7 μA shutdown current, current-sense threshold of 125 mV, and compatibility with Li-ion battery-powered systems requiring high efficiency and compact footprint.
Technical Context
The ADP1864AUJZ-R7 implements fixed-frequency (580 kHz nominal) current-mode control using an external P-channel MOSFET and sense resistor, where peak inductor current is compared against a COMP voltage-derived threshold. Its transconductance error amplifier compares FB voltage (0.8 V reference) against a resistive divider output to adjust duty cycle via COMP node voltage.
Protection logic includes UVLO (2.90 V falling threshold), OVP (0.885 V FB trip), and short-circuit foldback (oscillator drops to 190 kHz when FB < 0.35 V). Soft start is internally controlled with 1.1 ms power-on time, and 100% duty cycle operation enables dropout regulation down to VIN − VOUT ≈ 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.15 V to 14 V - supports single- to triple-cell Li-ion batteries and intermediate bus rails. |
| Output Voltage Range | 0.8 V to VIN - adjustable via external resistor divider; 0.8 V ±1.25% reference ensures tight core voltage regulation. |
| Switching Frequency | 580 kHz (typ) - enables use of small 5 µH inductors and reduces EMI fundamental frequency. |
| Current Sense Threshold | 125 mV (typ) - sets overcurrent limit with external sense resistor; supports accurate 5 A load current design. |
| Quiescent Current | 235 µA (typ) - minimizes standby power loss in battery-powered applications. |
| Shutdown Current | 7 µA (typ) - enables ultra-low-power system sleep modes without external disable circuitry. |
| Operating Temperature | −40°C to +125°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
ADP1864AUJZ-R7 is housed in a 6-lead TSOT (Thin Small Outline Transistor) package, 2.1 mm × 1.6 mm × 0.85 mm, with exposed pad for thermal dissipation. Pin 1 is COMP; pin 2 is GND; pin 3 is FB; pin 4 is CS; pin 5 is IN; pin 6 is PGATE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP | Error amplifier output | Drives external RC compensation network; pulled below 0.3 V disables controller and turns off PFET. |
| GND | Analog ground reference | Must be connected to dedicated analog ground plane; isolated from power ground at single point near pin. |
| FB | Feedback input | Monitors output via resistor divider; regulates to 0.8 V; triggers OVP at 0.885 V and SC foldback at 0.35 V. |
| CS | Current sense negative input | Connects to source side of external sense resistor; compares voltage drop to internal 125 mV threshold. |
| IN | Power supply input | Supplies IC bias and current sense amplifier positive input; requires ≥10 µF ceramic bypass capacitor. |
| PGATE | P-channel MOSFET gate driver | Drives external PFET gate directly; rise/fall times ≤50 ns/40 ns into 3 nF load; supports 100% duty cycle. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Delivers stable loop response with fast load transient recovery and predictable slope compensation requirements. |
| 0.8 V ±1.25% reference over temperature | Enables precise processor core and FPGA I/O rail regulation without external trimming or calibration. |
| 100% duty cycle operation | Maintains regulation during input voltage sag (e.g., battery discharge), eliminating need for LDO post-regulation. |
| Integrated protection suite | Combines UVLO, OVP, short-circuit foldback, and thermal-safe shutdown-reducing external component count. |
| TSOT-6 package with exposed pad | Provides low thermal resistance (θJA = 186°C/W on 4-layer board) for high-current designs in space-constrained layouts. |
Applications
| Processor Core Power Supply | Li-Ion Battery-Powered Wireless Device |
|---|---|
|
Use Scenario: Regulating 1.2 V core voltage for ARM Cortex-A series SoCs in portable tablets. IC Role / Device Role / Timing Role: Step-down controller managing dynamic voltage scaling (DVS) via FB divider and COMP loop response. Use Value: 580 kHz switching enables compact 5 µH inductor; 0.8 V reference tolerance ensures <±15 mV core voltage deviation across temperature. |
Use Scenario: Powering baseband processor and RF transceiver in Bluetooth LE headset with 3.6 V nominal Li-ion cell. IC Role / Device Role / Timing Role: Primary buck controller delivering 1.8 V and 3.3 V rails; enters 7 µA shutdown during idle intervals. Use Value: 100% duty cycle sustains regulation down to 3.15 V input; 235 µA quiescent current extends battery runtime by >12% vs. competing controllers. |
| Hard Disk Drive (HDD) Motor & Logic Supply | Set-Top Box Intermediate Bus Converter |
|
Use Scenario: Generating 5 V logic rail and 12 V motor drive from 19 V adapter in external HDD enclosure. IC Role / Device Role / Timing Role: High-efficiency (94% typ) buck controller handling 3 A continuous load with fast load-step response. Use Value: Current-mode architecture provides <50 µs recovery from 2 A load step; short-circuit foldback prevents data corruption during motor stall events. |
Use Scenario: Converting 12 V wall adapter output to 3.3 V/2 A for SoC, memory, and tuner subsystems in cable STB. IC Role / Device Role / Timing Role: Compact TSOT-6 controller enabling dense PCB layout; supports 5 A peak loads during channel change bursts. Use Value: TSOT-6 footprint saves >40% board area vs. SOIC-8 alternatives; 580 kHz frequency allows use of low-profile shielded inductors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1772ES6#TRMPBF | Pin-to-pin compatible per datasheet; same 6-lead SOT-23 package; 1.25 MHz switching frequency vs. 580 kHz. | Higher frequency enables smaller magnetics but increases switching losses above 3 A load. | Select LTC1772 for space-constrained designs needing <3 µH inductors; verify thermal performance at full load. |
| TPS54202DRCT | Integrated N-channel MOSFET; 4.5–17 V input; 0.8 V reference; no external PFET required. | Reduces BOM count but lacks 100% duty cycle and has higher quiescent current (45 µA vs. 235 µA active). | Choose TPS54202 for simplified layout where dropout operation is not required and efficiency at light load is secondary. |
Compared with LTC1772ES6#TRMPBF and TPS54202DRCT, ADP1864AUJZ-R7 uniquely balances ultra-low shutdown current (7 µA), 100% duty cycle, and proven 5 A capability in TSOT-6-making it optimal for battery-backed industrial controllers requiring extended deep-sleep autonomy and robust dropout behavior.
Availability
ADP1864AUJZ-R7 is available at Aetrix Electronics and suitable for wireless devices, Li-ion battery-powered applications, set-top boxes, and processor core power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADP1864AUJZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing operations worldwide.
The ADP1864AUJZ-R7 belongs to Analog Devices' precision DC-to-DC controller product line, designed specifically for cost-sensitive, high-efficiency buck regulation in portable and industrial power systems where small size, low quiescent current, and robust protection are critical.
FAQ
What is the maximum supported load current for ADP1864AUJZ-R7?
The ADP1864AUJZ-R7 is specified to support up to 5 A load current when paired with an appropriately rated external P-channel MOSFET, inductor, and sense resistor. This capability is validated across the full −40°C to +125°C junction temperature range and input voltage range of 3.15 V to 14 V, as confirmed in the Rev. C datasheet's General Description and Typical Performance Characteristics sections.
Does ADP1864AUJZ-R7 require an external MOSFET, and what type is needed?
Yes, ADP1864AUJZ-R7 requires an external P-channel MOSFET connected to the PGATE pin. The controller drives the gate directly and supports 100% duty cycle operation. Recommended devices include Fairchild FDC638P (as shown in the datasheet's Example Applications Circuit) with VGS(th) ≤ 2.15 V and RDS(ON) optimized for 5 A conduction at the target VIN.
What is the purpose of the CS pin on ADP1864AUJZ-R7?
The CS (Current Sense) pin on ADP1864AUJZ-R7 serves as the negative input to the internal current-sense amplifier. It connects to the source side of an external sense resistor placed between IN and the PFET source. The amplifier compares the resulting voltage drop against a 125 mV threshold to terminate the PWM on-time and enforce current limiting, enabling accurate peak-current-mode control.
Can ADP1864AUJZ-R7 operate with input voltages below 3.15 V?
No, ADP1864AUJZ-R7 has a minimum input voltage specification of 3.15 V per the Absolute Maximum Ratings and Operating Conditions tables. Below this, undervoltage lockout (UVLO) activates-holding PGATE high and disabling switching. The UVLO rising threshold is 3.00 V (typ), but reliable operation begins only at or above 3.15 V as guaranteed in the specifications.
How does the soft start function work on ADP1864AUJZ-R7?
The ADP1864AUJZ-R7 implements internal soft start with a fixed 1.1 ms power-on time. It activates upon IN rising above UVLO or when the COMP pin is released from GND. An internal 0.6 µA current source charges the external compensation capacitor, ramping COMP voltage gradually to prevent input inrush current and output voltage overshoot-no external components are required to enable this feature.
ADP1864AUJZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 3.15V ~ 14V
- Frequency - Switching:
- 580kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-6
ADP1864AUJZ-R7 FAQ
1.How can I place an order for ADP1864AUJZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1864AUJZ-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 ADP1864AUJZ-R7 reliable?
The price and inventory of ADP1864AUJZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1864AUJZ-R7 is usually 5 days.
3.What payment methods are accepted for ADP1864AUJZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1864AUJZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1864AUJZ-R7?
ADP1864AUJZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1864AUJZ-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 ADP1864AUJZ-R7?
For technical support, including ADP1864AUJZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1864AUJZ-R7 requirements.
6.How does Aetrix verify that ADP1864AUJZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADP1864AUJZ-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 ADP1864AUJZ-R7 meets industry standards.
7.What is the process for return or replacement of ADP1864AUJZ-R7?
All ADP1864AUJZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1864AUJZ-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 ADP1864AUJZ-R7 part is unused and in its original packaging.
Return procedure for ADP1864AUJZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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