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Analog Devices Inc. ADP1111AR-12
- Part No.:
- ADP1111AR-12
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1111AR-12.pdf
- Description:
- IC MULTI CONFIG 12V .2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:390
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Product details
Overview
ADP1111AR-12 from Analog Devices is a micropower, fixed-output step-up/step-down switching regulator delivering 12 V at up to 200 mA from a 12 V input in step-down mode or 100 mA from 3 V in step-up mode. It features 72 kHz oscillator frequency, internal 1 A power switch, user-adjustable current limit via ILIM pin, and operates from 2 V to 30 V input range. Used in battery-backed peripherals and flash memory VPP generation.
For engineers reviewing the ADP1111AR-12 datasheet, ADP1111AR-12 pinout, ADP1111AR-12 application, or ADP1111AR-12 equivalent, key selection factors include its dual-mode topology support (boost/buck/inverting), low 300 μA quiescent current in shutdown, ±5% output voltage accuracy at 12 V, and compatibility with surface-mount inductors and Schottky diodes in compact SO-8 packaging.
Technical Context
The ADP1111AR-12 integrates a gated-oscillator control architecture with a 1.25 V reference and comparator-based feedback loop. Its internal NPN power switch supports both collector-driven (step-up) and emitter-driven (step-down) configurations using externally accessible SW1 and SW2 pins.
Current limiting is implemented via resistor-programmable ILIM pin with temperature coefficient of –0.3%/°C; gain block (AO/SET pins) enables low-battery detection or post-regulation functions. Output voltage is laser-trimmed to 12.00 V ±5% (11.40–12.60 V), eliminating external feedback resistors for fixed-voltage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.00 V ±5% - eliminates need for external feedback divider in 12 V systems |
| Input Voltage Range | 2 V to 12 V (step-up), up to 30 V (step-down) - supports wide battery chemistries and industrial rails |
| Oscillator Frequency | 72 kHz typical - enables use of low-cost, high-saturation-current surface-mount inductors |
| Quiescent Current | 300 μA (switch off) - extends battery life in always-on portable instruments |
| Internal Switch Rating | 1 A peak, 1.5 A absolute max - handles transient loads without external FET in mid-power applications |
| Output Hysteresis | 75–120 mV - ensures stable regulation under dynamic load steps without external compensation |
| Package | SO-8 - standard footprint compatible with automated assembly and thermal relief pads |
Pinout & Package
ADP1111AR-12 is housed in an 8-lead plastic SOIC (SO-8) package with standard 1.27 mm pitch and exposed pad for thermal management. Pin 1 is ILIM; Pin 2 is VIN; Pin 3 is SW1; Pin 4 is GND; Pin 5 is AO; Pin 6 is SET; Pin 7 is SW2; Pin 8 is FB/SENSE (internally connected to laser-trimmed 12 V divider).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM | Current limit programming input | Connect to VIN directly for full 1 A switch current; add 220 Ω to VIN to limit to 400 mA - prevents inductor saturation during input transients |
| VIN | Main power supply input | Accepts 2–30 V DC - powers internal circuitry and supplies base drive for internal NPN switch |
| SW1 | Collector of internal NPN switch | In step-up: drives inductor node; in step-down: connects to input rail - requires Schottky catch diode rated ≥50 V |
| GND | Analog and power ground reference | Single-point return for feedback, oscillator, and switch - must be low-impedance path to minimize noise coupling |
| AO | Open-collector gain block output | Sinks 300 μA - used for low-battery flag or undervoltage lockout when paired with resistor divider on SET pin |
| SET | Non-inverting input of gain amplifier | Internally referenced to 1.25 V - enables precision threshold detection without external op-amp |
| SW2 | Emitter of internal NPN switch | In step-up: tied to GND; in step-down: drives inductor - must not fall below –0.5 V (Schottky clamp required) |
| FB/SENSE | Feedback sense input | Internally connected to laser-trimmed resistor network for 12 V output - no external components needed |
Key Features
| Feature | Design Value |
|---|---|
| Step-up/step-down/inverting topology support | Single IC replaces multiple regulators in multi-rail portable systems - reduces BOM count and board area |
| 72 kHz fixed-frequency operation | Enables predictable EMI filtering and consistent inductor sizing - avoids audible noise in consumer devices |
| User-adjustable current limit | Resistor-programmable ILIM allows precise inductor selection and overcurrent protection without redesign |
| Laser-trimmed 12 V output | ±5% accuracy over temperature eliminates calibration labor and improves yield in volume production |
| Low 300 μA quiescent current | Extends shelf life and runtime in battery-powered remote controls and backup supplies |
Applications
| Portable Instrument Power | Flash Memory VPP Generation |
|---|---|
Use Scenario: Handheld multimeter powered by two AA alkaline cells (1.8–3.2 V) requiring stable 12 V for analog front-end biasing and LCD contrast control. IC Role / Device Role / Timing Role: Step-up regulator generating regulated 12 V output from variable battery input using SW1/SW2 configured in boost topology. Use Value: Delivers 100 mA at 12 V with <300 μA quiescent draw - enables >1-year battery life while maintaining measurement accuracy across discharge curve. | Use Scenario: Embedded microcontroller system writing to EEPROM or Flash requiring +12 V programming voltage (VPP) during firmware updates. IC Role / Device Role / Timing Role: On-demand 12 V generator activated only during write cycles; FB pin tied directly to output per fixed-voltage configuration. Use Value: Laser-trimmed 12 V output ensures reliable programming margin without external trimming - eliminates risk of overvoltage damage to memory cells. |
| Battery Backup Supply | Peripheral Add-On Card |
Use Scenario: Industrial PLC module with SRAM cache that must retain data during main power failure using supercapacitor or coin cell. IC Role / Device Role / Timing Role: Step-down regulator converting 24 V system rail to 12 V backup rail; SW1 tied to VIN, SW2 driving inductor in buck configuration. Use Value: Supports 200 mA at 12 V from 12–30 V input - sustains memory retention for >72 hours with minimal capacitor size. | Use Scenario: PCIe add-in card with legacy interface requiring isolated 12 V auxiliary rail not supplied by host slot. IC Role / Device Role / Timing Role: Standalone 12 V converter using surface-mount inductor and MBRS130T3 Schottky diode in compact SO-8 layout. Use Value: 8-pin SOIC footprint fits tight board real estate; 72 kHz switching enables small 22 μH inductor - reduces height and cost vs. discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up/step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1931IS5#TRMPBF | Fixed 12 V output, 1.2 MHz switching, 1.25 A switch, SOT-23-5 package | Higher frequency enables smaller inductors/caps but increases EMI sensitivity; lacks step-down capability | Select when board space is critical and only step-up operation is needed; verify EMI compliance in final layout |
| TPS61040DRVR | Adjustable output (1.8–28 V), 500 kHz, 0.5 A switch, WSON-6 package | Requires external feedback resistors; no step-down mode; higher quiescent current (55 μA active, 1 μA shutdown) | Choose for flexible output tuning and ultra-low shutdown current; not suitable for buck or inverting topologies |
Compared with LT1931IS5#TRMPBF and TPS61040DRVR, ADP1111AR-12 uniquely supports all three topologies (boost/buck/inverting) in a single SO-8 package with laser-trimmed 12 V output and sub-500 μA quiescent draw - making it optimal for multi-function portable systems where board area and topology flexibility are constrained.
Availability
ADP1111AR-12 is available at Aetrix Electronics and suitable for portable instruments, flash memory programming circuits, battery backup supplies, and peripheral add-on cards requiring stable component supply across extended product lifecycles.
Supply support for ADP1111AR-12 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 ADP1111 family was designed for low-power, multi-topology DC/DC conversion in space-constrained portable and battery-operated equipment - emphasizing micropower operation, minimal external components, and flexible voltage conversion without sacrificing accuracy or reliability.
FAQ
What is the output voltage tolerance of the ADP1111AR-12 over temperature and line conditions?
The ADP1111AR-12 delivers a nominal 12.00 V output with guaranteed tolerance of ±5% (11.40 V to 12.60 V) across the full operating temperature range (0°C to +70°C) and input voltage range (2 V to 30 V). This specification is achieved via on-chip laser trimming of internal feedback resistors, ensuring stability without external calibration components in the ADP1111AR-12 design.
Can the ADP1111AR-12 operate in step-down mode with a 24 V input?
Yes, the ADP1111AR-12 supports step-down operation with input voltages up to 30 V, including 24 V. In this configuration, SW1 connects to VIN and SW2 drives the inductor. The ADP1111AR-12's absolute maximum SW2 pin rating is –0.5 V, so a Schottky diode (e.g., MBRS130T3) must be used to prevent negative excursion beyond this limit during switch-off transitions.
Does the ADP1111AR-12 require external feedback resistors for 12 V output?
No, the ADP1111AR-12 does not require external feedback resistors. It integrates laser-trimmed internal resistors that set the output to 12.00 V ±5%. The FB/SENSE pin (Pin 8) is internally connected to this trimmed network, so users connect it directly to the output node - simplifying layout and improving long-term stability compared to discrete resistor networks in the ADP1111AR-12 implementation.
How is current limiting configured on the ADP1111AR-12?
Current limiting on the ADP1111AR-12 is configured by connecting a resistor between the ILIM pin (Pin 1) and VIN. A 220 Ω resistor sets the maximum switch current to 400 mA; direct connection to VIN enables full 1 A capability. The current limit has a temperature coefficient of –0.3%/°C, providing inherent derating at elevated temperatures - a feature confirmed in the ADP1111AR-12 datasheet specifications table.
What package type is used for the ADP1111AR-12, and is thermal relief recommended?
The ADP1111AR-12 uses an 8-lead plastic SOIC (SO-8) package with standard 1.27 mm lead pitch. The package includes an exposed thermal pad on the underside, and Analog Devices recommends using thermal relief vias and copper pour connected to GND for effective heat dissipation - especially under continuous 200 mA step-down operation where power dissipation reaches ~300 mW in the ADP1111AR-12 device.
ADP1111AR-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADP1111AR-12 FAQ
1.How can I place an order for ADP1111AR-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1111AR-12 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 ADP1111AR-12 reliable?
The price and inventory of ADP1111AR-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1111AR-12 is usually 5 days.
3.What payment methods are accepted for ADP1111AR-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1111AR-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1111AR-12?
ADP1111AR-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1111AR-12 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 ADP1111AR-12?
For technical support, including ADP1111AR-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1111AR-12 requirements.
6.How does Aetrix verify that ADP1111AR-12 is sourced from the original manufacturer or authorized distributors?
All ADP1111AR-12 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 ADP1111AR-12 meets industry standards.
7.What is the process for return or replacement of ADP1111AR-12?
All ADP1111AR-12 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1111AR-12, 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 ADP1111AR-12 part is unused and in its original packaging.
Return procedure for ADP1111AR-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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