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Analog Devices Inc. ADP1147AR-5
- Part No.:
- ADP1147AR-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1147AR-5.pdf
- Description:
- STEP-DOWN SWITCHING REG
- Quantity:
- Payment:
- Shipping:
Inventory:3,040
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Product details
Overview
ADP1147AR-5 from Analog Devices is a high-efficiency step-down switching regulator controller designed to drive an external P-channel MOSFET in DC/DC conversion applications. It delivers a regulated 5 V output at up to 2 A load, operates from 3.5 V to 16 V input, features constant off-time current-mode control, and achieves >95% efficiency at 1 A with VIN = 10 V. It is used in portable computers and GPS systems where compact, efficient voltage regulation is required.
For engineers reviewing the ADP1147AR-5 datasheet, ADP1147AR-5 pinout, ADP1147AR-5 application, or ADP1147AR-5 equivalent, key selection considerations include its SOIC-8 package, 5 V fixed output, 150°C/W thermal resistance (θJA), user-defined current limit via RSENSE, and automatic power-saving mode that reduces quiescent current to 160 µA at no load.
Technical Context
The ADP1147AR-5 implements a constant off-time, current-mode architecture that sets switching frequency via external CT capacitor and regulates output by comparing SENSE(–) feedback against an internal 1.25 V reference. Its off-time is programmable (3.8–6 µs), and CT discharge current scales with VOUT to maintain stable operation across input voltage variations.
It integrates dual-mode operation: continuous conduction mode for full-load efficiency and automatic power-saving mode below ~50% ripple current, reducing ground current from 2.3 mA to 160 µA. Sleep mode further disables circuitry when output voltage decays to VOS threshold, minimizing standby power to 2.0 mW at VIN = 10 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05 V (typ) at 700 mA load; ±2% tolerance over line/load/temperature ensures stable rail for microcontrollers and RF modules. |
| Input Voltage Range | 3.5 V to 16 V; supports single-cell Li-ion (4.2 V) through 12 V industrial rails without external LDO pre-regulation. |
| Efficiency | >95% at 1 A, VIN = 10 V; enables thermally constrained portable designs by minimizing heat generation in SOIC-8 package. |
| Quiescent Current | 160 µA (typ) in sleep mode; extends battery life in always-on GPS or modem standby states. |
| Current Sense Threshold | 120–175 mV range; allows precise peak-current limiting via external RSENSE resistor (e.g., 50 mΩ for 2 A max). |
| Off-Time | 3.8–6 µs (CT = 390 pF); determines minimum on-time and maximum switching frequency (~250 kHz), critical for EMI control and inductor sizing. |
| Shutdown Threshold | 0.55–2.0 V on SHUTDOWN pin; compatible with standard logic-level GPIOs for system-level power sequencing. |
Pinout & Package
ADP1147AR-5 is housed in an 8-lead SOIC (SO-8) package with θJA = 150°C/W, optimized for surface-mount assembly and moderate-power DC/DC applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Accepts 3.5–16 V DC; must be bypassed with ≥100 µF low-ESR capacitor near pin to suppress switching transients. |
| CT (Pin 2) | Timing capacitor node | Sets off-time and operating frequency; value (e.g., 390 pF) directly determines fSW and ripple current stability. |
| ITH (Pin 3) | Error amplifier decoupling | Connects to 3300 pF capacitor; stabilizes loop compensation and prevents oscillation during load transients. |
| SENSE(–) (Pin 4) | Negative feedback input | Connects to internal resistive divider; monitors regulated output voltage and enables precision 5 V setpoint. |
| SENSE(+) (Pin 5) | Current comparator positive input | Paired with SENSE(–) to sense voltage drop across RSENSE; defines current-limit trip point (120–175 mV). |
| SHUTDOWN (Pin 6) | Enable/disable control | Pull ≤0.55 V to disable P-DRIVE; pull ≥2.0 V to enter shutdown (IQ ≤ 28 µA); must not float. |
| GND (Pin 7) | Signal and power ground | Requires separate low-impedance return paths to COUT cathode and Schottky diode cathode to avoid noise coupling. |
| P-DRIVE (Pin 8) | High-current MOSFET gate driver | Swings from VIN to GND; drives P-channel MOSFET gate with fast rise/fall times (<200 ns) to minimize switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time current-mode control | Enables wide input range (3.5–16 V) and simplifies loop compensation-no external error amplifier needed. |
| Automatic power-saving mode | Switches from continuous to discontinuous conduction below ~50% ripple current, maintaining >85% efficiency at 100 mA. |
| Sleep mode with 2.0 mW standby | Reduces total system power in zero-load conditions (e.g., GPS cold start), critical for battery longevity. |
| User-defined current limit | RSENSE resistor (20–200 mΩ) sets precise peak inductor current, enabling robust short-circuit protection without sensing IC. |
| SOIC-8 thermal performance | θJA = 150°C/W enables 2 A operation with minimal heatsinking-suitable for space-constrained portable PCBs. |
Applications
| Portable Computers | Cellular Telephones |
|---|---|
Use Scenario: Powering core logic and I/O rails in clamshell laptops with dynamic CPU load profiles. IC Role / Device Role / Timing Role: Step-down controller driving IRF7204 P-MOSFET to generate stable 5 V from 7–12 V battery or adapter input. Use Value: >95% efficiency at 1–2 A reduces thermal load on motherboard; power-saving mode extends runtime during light-use states. |
Use Scenario: Supplying 5 V to baseband processor and RF front-end in 2G/3G handsets with tight thermal envelopes. IC Role / Device Role / Timing Role: Regulating 5 V rail from single-cell Li-ion (4.2 V min) using constant off-time architecture to maintain regulation down to dropout. Use Value: 160 µA sleep current minimizes battery drain during call standby; SOIC-8 footprint fits high-density RF module layouts. |
| GPS Systems | Handheld Instruments |
Use Scenario: Providing clean, low-noise 5 V supply to GPS receiver ICs requiring stable voltage during satellite acquisition. IC Role / Device Role / Timing Role: High-efficiency buck controller with tight load regulation (±100 mV) and low output ripple (<50 mV p-p in sleep mode). Use Value: Maintains position lock under varying battery voltage (3.5–4.2 V); power-saving mode enables multi-hour cold-start operation. |
Use Scenario: Powering microcontroller, display, and sensor interface in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Fixed 5 V controller with shutdown pin for MCU-controlled power cycling and low-quiescent sleep mode. Use Value: Enables "instant-on" wake from deep sleep with <2.0 mW standby; SOIC-8 allows easy rework and test access on small PCBs. |
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-5 | Higher efficiency (>96%), lower IQ (120 µA sleep), supports wider VIN (2.7–16 V), but requires different CT timing and compensation. | Better suited for ultra-low-power battery systems; not drop-in due to revised error amplifier structure and pin-compatible but non-identical compensation network. | Select ADP1148AR-5 only if efficiency >96% and sub-120 µA sleep current are mandatory; redesign CT/ITH values and validate loop stability. |
| LM2594HVS-5.0 | Fixed-frequency (150 kHz) PWM controller; higher quiescent current (8 mA active, 75 µA shutdown), no automatic power-saving mode. | Used in cost-sensitive industrial supplies where simplicity outweighs efficiency; lacks adaptive mode switching and has looser load regulation (±150 mV). | Choose LM2594HVS-5.0 for legacy designs or where predictable fixed-frequency EMI is preferred over variable-frequency optimization. |
Compared with ADP1147AR-5, ADP1148AR-5 offers superior efficiency and lower sleep current but demands layout and compensation changes, while LM2594HVS-5.0 trades efficiency and adaptive modes for design simplicity and broader vendor support-making ADP1147AR-5 the optimal balance of performance, integration, and ease of use in portable 5 V systems.
Availability
ADP1147AR-5 is available at Aetrix Electronics and suitable for portable computers, cellular telephones, and GPS systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for ADP1147AR-5 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 power management markets since 1965.
The ADP1147AR-5 belongs to Analog Devices' high-efficiency step-down switching regulator controller family, engineered specifically for portable and battery-powered applications demanding >95% efficiency, ultra-low quiescent current, and seamless transition between continuous and power-saving operating modes.
FAQ
What is the output voltage accuracy of the ADP1147AR-5 under full load?
The ADP1147AR-5 delivers a nominal 5.05 V output with ±2% tolerance (4.90 V to 5.20 V) at 700 mA load and VIN = 9 V. Load regulation is specified as ±100 mV across 5 mA to 2 A, ensuring stable 5 V rail integrity for sensitive microcontrollers and communication ICs in the ADP1147AR-5 application circuit.
How does the ADP1147AR-5 enter and exit power-saving mode?
The ADP1147AR-5 automatically enters power-saving mode when load current drops below ~50% of the inductor's ripple current, causing reversal of voltage polarity across RSENSE and triggering internal comparator B. It exits when output voltage decays to the VOS threshold (≈1.25 V), resetting the R-S flip-flop and resuming cycle-by-cycle operation-ensuring seamless transitions without output droop in the ADP1147AR-5 design.
What is the recommended RSENSE value for a 2 A ADP1147AR-5 application?
For a 2 A maximum output, the recommended RSENSE is 50 mΩ, calculated using RSENSE (mΩ) = 100 / IMAX per Analog Devices' design equation. This yields a current-sense threshold of 120–175 mV, aligning with the ADP1147AR-5's specified sense range and providing margin for component tolerance and temperature drift in production ADP1147AR-5 systems.
Can the ADP1147AR-5 operate from a 3.7 V Li-ion battery?
Yes-the ADP1147AR-5 supports input voltages as low as 3.5 V, making it fully compatible with single-cell Li-ion batteries (3.0–4.2 V). At VIN = 3.7 V, it maintains regulation by extending off-time and entering dropout mode only when VIN falls within ~1.5 V of VOUT (i.e., below ~6.5 V), ensuring reliable operation across the full battery discharge curve in ADP1147AR-5 portable designs.
What thermal derating applies to the ADP1147AR-5 in SOIC-8 package?
The ADP1147AR-5 in SOIC-8 has θJA = 150°C/W. With TJ(max) = +150°C and TA(max) = +85°C, maximum allowable power dissipation is PD = (150 – 85) / 150 = 0.433 W. At 2 A output and 5 V, this corresponds to a practical upper limit of ~1.5 A continuous load without additional copper pour or airflow-critical for thermal validation in ADP1147AR-5 PCB layouts.
ADP1147AR-5 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-5 FAQ
1.How can I place an order for ADP1147AR-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1147AR-5 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-5 reliable?
The price and inventory of ADP1147AR-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1147AR-5 is usually 5 days.
3.What payment methods are accepted for ADP1147AR-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1147AR-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1147AR-5?
ADP1147AR-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1147AR-5 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-5?
For technical support, including ADP1147AR-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1147AR-5 requirements.
6.How does Aetrix verify that ADP1147AR-5 is sourced from the original manufacturer or authorized distributors?
All ADP1147AR-5 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-5 meets industry standards.
7.What is the process for return or replacement of ADP1147AR-5?
All ADP1147AR-5 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1147AR-5, 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-5 part is unused and in its original packaging.
Return procedure for ADP1147AR-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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