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Analog Devices Inc. ADP1147AR-3.3
- Part No.:
- ADP1147AR-3.3
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1147AR-3.3.pdf
- Description:
- STEP-DOWN SWITCHING REG
- Quantity:
- Payment:
- Shipping:
Inventory:1,524
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Product details
Overview
ADP1147AR-3.3 from Analog Devices is a high-efficiency step-down switching regulator controller designed to drive an external P-channel MOSFET in portable power supplies. It delivers a regulated 3.3 V output at up to 2 A, operates from 3.5 V to 16 V input, features constant off-time current-mode control, and achieves >95% efficiency at full load with 3.3 V output. It is used in GPS systems and handheld instruments requiring compact, low-quiescent-power DC/DC conversion.
For engineers reviewing the ADP1147AR-3.3 datasheet, ADP1147AR-3.3 pinout, ADP1147AR-3.3 application, or ADP1147AR-3.3 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated SOIC-8 pin functions, confirmed alternative options, and supply support details for production ramp-up.
Technical Context
The ADP1147AR-3.3 implements a constant off-time, current-mode architecture that sets switching frequency via external CT capacitor and scales off-time inversely with output voltage. It uses dual comparators (C and B) to detect current-sense voltage across RSENSE and trigger power-saving mode when load drops below ~50% of ripple current.
It integrates an internal 1.25 V reference, error amplifier decoupling on ITH, and sleep-mode logic that reduces ground current from 2.3 mA to 160 µA typical. Shutdown threshold is 0.6–2.0 V, and SENSE(+) and SENSE(–) pins establish a 10–175 mV adjustable current-limit window referenced to VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.33 V nominal (±3.0% over 5 mA–2 A load), enabling stable 3.3 V rail for microcontrollers and RF ICs. |
| Input Voltage Range | 3.5 V to 16 V - supports single-cell Li-ion (3.6 V min) through 12 V industrial rails without pre-regulation. |
| Efficiency | >95% at 2 A, VIN = 6 V - minimizes thermal rise in space-constrained portable enclosures. |
| Sleep Mode Current | 160 µA typical - extends battery life in standby states of GPS receivers and handheld meters. |
| Current Sense Threshold | 10–175 mV range - allows precise RSENSE-based peak-current limiting (e.g., 50 mΩ → 200–3500 mA trip). |
| Off-Time | 3.8–6 µs (CT = 390 pF, 700 mA) - determines minimum on-time and enables stable operation down to 3.5 V input. |
| Shutdown Threshold | 0.55–2.0 V - compatible with standard GPIOs and open-collector logic for system-level power sequencing. |
Pinout & Package
ADP1147AR-3.3 is housed in an 8-lead SOIC (SO-8) package with θJA = 150°C/W, optimized for surface-mount assembly and thermal relief via exposed pad grounding (per Analog Devices layout guidance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main input supply connection | Accepts 3.5–16 V; powers internal circuitry and drives P-DRIVE output swing. |
| CT (Pin 2) | Timing capacitor node | Sets off-time and operating frequency (e.g., 390 pF → ~200 kHz at VIN = 10 V); discharge current scales with VOUT. |
| ITH (Pin 3) | Error amplifier compensation | Decouples internal gain block; external RC network stabilizes loop response and load transient recovery. |
| SENSE(–) (Pin 4) | Negative current/voltage sense input | Connects to internal resistive divider for output voltage feedback and serves as (–) input to current comparator C. |
| SENSE(+) (Pin 5) | Positive current sense input | Provides (+) input to current comparator; offset vs. SENSE(–) defines RSENSE-based current limit threshold. |
| SHUTDOWN (Pin 6) | Enable/disable control | Pulled low for normal operation; >2.0 V forces shutdown, reducing quiescent current to 10–28 µA. |
| GND (Pin 7) | Signal and power return | Must be connected separately to COUT negative and Schottky cathode to avoid noise coupling into sense path. |
| P-DRIVE (Pin 8) | External P-MOSFET gate driver | Swings from VIN to GND; delivers high peak current to switch IRF7204/IRF7403-class devices at ≤250 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time current-mode control | Enables wide input range (3.5 V min) and eliminates need for external compensation components in most designs. |
| Automatic power savings mode | Switches from continuous conduction to burst-mode below ~1 A, cutting ground current from 2.3 mA to 160 µA. |
| User-defined current limit | Adjustable 10–175 mV sense window allows precise RSENSE selection (e.g., 0.05 Ω → 200–3500 mA trip). |
| Low dropout capability | Minimizes VOUT droop under load by optimizing inductor DCR, RSENSE, and P-MOSFET RDS(ON) - critical for 3.3 V systems. |
| Integrated sleep mode | Reduces total standby power to ~2.0 mW at VIN = 10 V, extending battery runtime in always-on portable instrumentation. |
Applications
| GPS Receivers | Handheld Test Meters |
|---|---|
Use Scenario: Compact GNSS modules requiring clean, low-noise 3.3 V supply from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Step-down controller managing external P-MOSFET and Schottky diode to regulate VCC for RF front-end and baseband ICs. Use Value: >95% efficiency at 3.3 V/1 A preserves battery capacity; sleep mode draws only 160 µA during satellite acquisition pauses. |
Use Scenario: Portable multimeters with LCD display and microcontroller, powered by AA/AAA batteries or USB. IC Role / Device Role / Timing Role: Primary DC/DC controller generating stable 3.3 V rail for ADC, op-amps, and communication interfaces. Use Value: Constant off-time architecture ensures regulation stability across 3.5–16 V input range; low 10 mV current-sense threshold enables accurate overload protection. |
| Cellular Modems | Portable Medical Sensors |
Use Scenario: LTE/NB-IoT modems in asset trackers where thermal headroom and battery longevity are critical. IC Role / Device Role / Timing Role: High-efficiency buck controller driving P-MOSFET to supply 3.3 V to modem SoC and RF transceiver. Use Value: 160 µA sleep current extends years-long deployment; shutdown pin enables host MCU to power-cycle modem on demand. |
Use Scenario: Wearable ECG or SpO₂ sensors using coin-cell or small Li-Po batteries with strict 10–100 µA idle requirements. IC Role / Device Role / Timing Role: Low-quiescent switching controller delivering regulated 3.3 V to analog front-end and BLE radio. Use Value: Sleep mode reduces system standby power to ~2 mW; 3.5 V minimum input avoids brownout during battery discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP1148AR-3.3 | Higher efficiency (>96%), lower sleep current (100 µA), integrated soft-start, same SO-8 package and pinout. | Better suited for high-density battery-powered designs where thermal margin and ultra-low standby matter. | Select ADP1148AR-3.3 if upgrading for improved light-load efficiency and reduced PCB area (no external soft-start RC needed). |
| TPS54202DR | Integrated 2-A N-MOSFET, fixed 3.3 V output, 4.5–28 V input, no external RSENSE required. | Reduces BOM count but lacks adjustable current limit and P-MOSFET flexibility for low-VIN operation. | Choose TPS54202DR for simpler layout and faster time-to-market where 4.5 V minimum input is acceptable. |
Compared with ADP1147AR-3.3, ADP1148AR-3.3 offers measurable gains in light-load efficiency and integration, while TPS54202DR trades external component flexibility for monolithic simplicity - both require revalidation of thermal and transient performance in the target application.
Availability
ADP1147AR-3.3 is available at Aetrix Electronics and suitable for GPS receivers, handheld test meters, cellular modems, and portable medical sensors requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for ADP1147AR-3.3 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 ADP1147AR-3.3 belongs to Analog Devices' high-efficiency step-down controller product line, engineered specifically for portable and battery-operated systems needing wide-input-range, low-quiescent-power DC/DC conversion with external MOSFET flexibility.
FAQ
What is the minimum input voltage supported by the ADP1147AR-3.3?
The ADP1147AR-3.3 supports a minimum input voltage of 3.5 V - explicitly specified for the -3.3 variant in the datasheet's General Description and Figure 17. This enables direct operation from partially discharged single-cell Li-ion batteries (down to ~3.5 V) without requiring a boost pre-regulator, unlike the ADP1147-5 version which starts at 4.5 V.
How does the ADP1147AR-3.3 enter and exit sleep mode?
The ADP1147AR-3.3 enters sleep mode when load current falls so low that capacitor CT discharges below VTH2, causing comparator S to trip and assert internal sleep bar. It exits sleep mode when the output voltage decays to VOS level, resetting R-S flip-flop #2 and resuming cycle-by-cycle operation - all autonomously, without external intervention.
Can the ADP1147AR-3.3 drive an N-channel MOSFET instead of a P-channel device?
No - the ADP1147AR-3.3 is designed exclusively for P-channel MOSFETs, as confirmed by its P-DRIVE pin specification (swings from VIN to GND) and functional block diagram. Driving an N-MOSFET would require high-side gate drive with bootstrap or charge-pump circuitry not supported by this controller.
What is the purpose of the ITH pin on the ADP1147AR-3.3?
The ITH pin on the ADP1147AR-3.3 is the error amplifier decoupling node. Its voltage level directly controls the current threshold of the internal comparator, making it critical for loop compensation. An external RC network on ITH sets dominant pole location and ensures stable regulation across line/load transients per Figure 20 layout guidelines.
Is the ADP1147AR-3.3 pin-compatible with the ADP1147AN-3.3?
Yes - both ADP1147AR-3.3 (SOIC-8) and ADP1147AN-3.3 (PDIP-8) share identical pin numbering, function mapping, and electrical specifications. The only difference is package type and thermal resistance (θJA = 150°C/W for SOIC vs. 110°C/W for PDIP), as documented in the Ordering Guide and Absolute Maximum Ratings table.
ADP1147AR-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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):
- 3.5V ~ 16V
- Frequency - Switching:
- Up to 250kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADP1147AR-3.3 FAQ
1.How can I place an order for ADP1147AR-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1147AR-3.3 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 ADP1147AR-3.3 reliable?
The price and inventory of ADP1147AR-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1147AR-3.3 is usually 5 days.
3.What payment methods are accepted for ADP1147AR-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1147AR-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1147AR-3.3?
ADP1147AR-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1147AR-3.3 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 ADP1147AR-3.3?
For technical support, including ADP1147AR-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1147AR-3.3 requirements.
6.How does Aetrix verify that ADP1147AR-3.3 is sourced from the original manufacturer or authorized distributors?
All ADP1147AR-3.3 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 ADP1147AR-3.3 meets industry standards.
7.What is the process for return or replacement of ADP1147AR-3.3?
All ADP1147AR-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1147AR-3.3, 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 ADP1147AR-3.3 part is unused and in its original packaging.
Return procedure for ADP1147AR-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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