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Analog Devices Inc. ADP1111AR-3.3
- Part No.:
- ADP1111AR-3.3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1111AR-3.3.pdf
- Description:
- IC MULTI CONFIG 3.3V .2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,920
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Product details
Overview
ADP1111AR-3.3 from Analog Devices is a micropower, fixed-output step-up/step-down switching regulator IC with internal 1 A power switch, 72 kHz oscillator, and 3.3 V ±5% output voltage. It operates from 2 V to 30 V input (step-down up to 30 V, step-up up to 12.6 V), delivers up to 100 mA at 3.3 V from 3 V input in boost mode, and supports battery-powered portable instruments, flash memory VPP generation, and remote controls.
For engineers reviewing the ADP1111AR-3.3 datasheet, ADP1111AR-3.3 pinout, ADP1111AR-3.3 application, or ADP1111AR-3.3 equivalent, key selection factors include its dual-mode topology support, user-adjustable current limit via ILIM pin, low 300–500 μA quiescent current, integrated 1.25 V reference, and compatibility with surface-mount inductors and Schottky diodes in compact SO-8 packaging.
Technical Context
The ADP1111AR-3.3 implements a gated-oscillator control architecture with a 72 kHz fixed-frequency PWM generator and comparator-based feedback loop referenced to an internal 1.25 V bandgap. Its dual-collector/emitter switch configuration enables reconfigurable step-up, step-down, or inverting topologies without external MOSFETs.
It features an open-collector auxiliary gain block (AO pin) for low-battery detection or undervoltage lockout, programmable current limiting via resistor between ILIM and VIN (e.g., 220 Ω sets 400 mA limit), and hysteresis-stabilized regulation eliminating need for external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±5% (3.13–3.47 V); laser-trimmed on-die resistors eliminate external feedback network. |
| Input Voltage Range | 2.0–12.6 V (step-up), up to 30 V (step-down); supports wide battery discharge profiles including single-cell Li-ion and multi-cell alkaline. |
| Oscillator Frequency | 72 kHz typical (54–88 kHz); enables use of small, low-cost surface-mount inductors (e.g., 22 µH) with minimal EMI concerns. |
| Quiescent Current | 300–500 μA (switch off); critical for battery life extension in always-on or low-duty-cycle portable systems. |
| Switch Current Limit | Programmable up to 400 mA (via 220 Ω ILIM-to-VIN resistor); protects internal 1 A bipolar switch during overload or short-circuit transients. |
| Output Hysteresis | 21–50 mV; ensures stable regulation under dynamic load steps without external compensation. |
| Operating Temperature | 0°C to +70°C (ADP1111A grade); validated for industrial and consumer portable equipment environments. |
Pinout & Package
ADP1111AR-3.3 is housed in an 8-lead plastic SOIC (SO-8) package, RoHS-compliant, with standard 1.27 mm pitch and exposed pad not present. Pin 1 is A0 (auxiliary gain output), Pin 2 is ILIM (current limit programming), Pin 3 is SW1 (switch collector), Pin 4 is GND, Pin 5 is VIN (input supply), Pin 6 is SW2 (switch emitter), Pin 7 is SET (gain amplifier input), and Pin 8 is FB/SENSE (feedback input tied internally to fixed 3.3 V divider).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 (Pin 1) | Auxiliary gain block output | Open-collector NPN capable of sinking 300 μA; used for low-battery detection, post-regulation, or UVLO when configured with external resistor divider on SET pin. |
| ILIM (Pin 2) | Current limit programming node | Connect to VIN directly for full 1 A switch capability; add resistor (e.g., 220 Ω) to reduce max switch current to 400 mA, preventing inductor saturation or thermal stress. |
| SW1 (Pin 3) | Internal power switch collector | In step-up: connects to inductor/diode node; in step-down: connects to VIN; withstands up to 50 V transient, enabling robust operation across input range. |
| GND (Pin 4) | Power and signal reference ground | Common return for internal reference, error amplifier, and driver; must be low-impedance path to minimize noise coupling into feedback loop. |
| VIN (Pin 5) | Main input supply connection | Accepts 2–30 V DC; powers internal bias circuitry, oscillator, and driver; requires local 10 µF ceramic bypass capacitor near pin. |
| SW2 (Pin 6) | Internal power switch emitter | In step-up: connects to GND; in step-down: drives inductor; rated for −0.5 V to VIN; must not exceed −350 mV below GND to avoid latch-up. |
| SET (Pin 7) | Gain amplifier non-inverting input | Internally referenced to 1.25 V; used with external resistor divider from VIN to configure low-battery threshold or error amplifier function. |
| FB/SENSE (Pin 8) | Feedback input | Internally connected to laser-trimmed resistor network for 3.3 V output; no external resistors required-simplifies layout and improves accuracy vs. adjustable versions. |
Key Features
| Feature | Design Value |
|---|---|
| Step-up/step-down/inverting topology support | Single IC replaces multiple discrete regulators; reduces BOM count and PCB area in space-constrained portable designs. |
| Fixed 3.3 V output with ±5% tolerance | Eliminates external feedback resistors and associated layout sensitivity; guarantees regulated rail for 3.3 V microcontrollers and logic without trimming. |
| 72 kHz fixed-frequency operation | Enables predictable EMI filtering and consistent inductor sizing; avoids subharmonic oscillation issues common in variable-frequency controllers. |
| User-adjustable current limit | Prevents thermal runaway during startup or fault conditions; allows optimization of inductor size and efficiency across varying input voltages. |
| Low 300–500 μA quiescent current | Extends battery runtime in standby or sleep modes; critical for applications requiring >1-year shelf life or intermittent wake-up cycles. |
| Integrated 1.25 V reference and comparator | Provides stable regulation without external references; hysteresis ensures stability without compensation capacitors or complex feedback networks. |
Applications
| Laptop & Palmtop Power Management | Flash Memory VPP Generation |
|---|---|
|
Use Scenario: Generating stable 3.3 V supply from variable 3–12 V battery sources in handheld computing devices with tight thermal and space constraints. IC Role / Device Role / Timing Role: Primary step-up/step-down regulator delivering regulated 3.3 V to CPU I/O, display interface, and peripheral buses. Use Value: Enables single-supply operation across battery discharge curve; eliminates need for separate LDOs or buck converters while maintaining <5% output tolerance. |
Use Scenario: Providing precise 3.3 V programming voltage (VPP) for NOR/NAND flash memory during write/erase cycles in embedded storage modules. IC Role / Device Role / Timing Role: High-accuracy, low-noise charge pump replacement delivering clean, ripple-free 3.3 V during brief high-current pulses. Use Value: Ensures reliable flash programming by maintaining ±5% regulation under fast load transients; avoids data corruption due to undershoot. |
| Remote Control & Low-Power Peripherals | Battery Backup Supplies |
|
Use Scenario: Powering 3.3 V RF transceivers and microcontrollers in infrared or 2.4 GHz remote controls powered by two AA cells (1.8–3.2 V). IC Role / Device Role / Timing Role: Micropower step-up regulator converting 1.8–3.2 V battery input to regulated 3.3 V output during active transmission bursts. Use Value: Delivers 100 mA at 3.3 V from 3 V input with only 300 μA quiescent current, extending usable battery life beyond 6 months per set. |
Use Scenario: Maintaining 3.3 V backup rail for real-time clocks and SRAM during main power failure in industrial controllers and medical monitors. IC Role / Device Role / Timing Role: Standby-mode regulator activated upon AC loss, sustaining critical functions using supercapacitor or coin-cell energy reserve. Use Value: Operates down to 2 V input and draws <500 μA quiescent current, maximizing hold-up time from limited backup energy sources. |
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 |
|---|---|---|---|
| ADP1111AR-5 | Fixed 5 V output (4.75–5.25 V); identical pinout, package, and topology support; same quiescent current and frequency. | Used where system requires 5 V logic rail instead of 3.3 V; not suitable for 3.3 V-only interfaces without additional LDO. | Select ADP1111AR-5 only if target application mandates 5 V output; otherwise ADP1111AR-3.3 provides direct compatibility with modern 3.3 V MCUs. |
| MAX630CPA+ | Fixed 3.3 V output but limited to 100 mA max; 100 kHz switching; no ILIM pin or AO gain block; DIP-8 only (no SO-8 option). | Suitable for low-current, non-critical applications; lacks programmable current limit and auxiliary monitoring features. | Choose MAX630CPA+ only for cost-sensitive, low-power legacy designs where SO-8 footprint and advanced protection features are unnecessary. |
Compared with ADP1111AR-5 and MAX630CPA+, the ADP1111AR-3.3 uniquely combines fixed 3.3 V accuracy, SO-8 compactness, programmable current limiting, and auxiliary gain functionality-making it optimal for new portable designs requiring reliability, flexibility, and long battery life.
Availability
ADP1111AR-3.3 is available at Aetrix Electronics and suitable for laptop power management, flash memory VPP generation, remote control supplies, battery backup systems, and portable instrumentation requiring stable component supply across extended production lifecycles.
Supply support for ADP1111AR-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing expertise spanning over 50 years.
The ADP1111 family was engineered specifically for ultra-low-power, multi-topology DC/DC conversion in portable and battery-operated systems-prioritizing micropower operation, minimal external component count, and flexible voltage conversion without sacrificing regulation accuracy.
FAQ
What is the output voltage tolerance of the ADP1111AR-3.3?
The ADP1111AR-3.3 delivers a fixed 3.3 V output with guaranteed tolerance of ±5%, corresponding to 3.13 V minimum and 3.47 V maximum across temperature and line/load conditions. This specification is achieved via on-chip laser-trimmed resistors and is explicitly confirmed in the Rev. A datasheet's "ADP1111–SPECIFICATIONS" table under "OUTPUT SENSE VOLTAGE" for ADP1111-3.3.
Can the ADP1111AR-3.3 operate in step-down mode from a 12 V input?
Yes, the ADP1111AR-3.3 supports step-down (buck) operation from inputs up to 30 V, including 12 V. In this configuration, SW1 connects to VIN and SW2 drives the inductor. The device can deliver 200 mA at 5 V from 12 V input; for 3.3 V output, typical capability exceeds 150 mA depending on inductor selection and thermal design, as verified in the "GENERAL DESCRIPTION" and "INDUCTOR SELECTION–STEP-DOWN CONVERTER" sections.
Does the ADP1111AR-3.3 require external feedback resistors?
No, the ADP1111AR-3.3 does not require external feedback resistors. Unlike the adjustable ADP1111 version, the -3.3 variant integrates precision laser-trimmed resistors internally to set the 3.3 V output. The FB/SENSE pin (Pin 8) connects directly to the output node, as stated in the "PIN DESCRIPTIONS" and "THEORY OF OPERATION" sections of the datasheet.
What is the purpose of the ILIM pin on the ADP1111AR-3.3?
The ILIM pin (Pin 2) on the ADP1111AR-3.3 allows user-programmable current limiting of the internal 1 A power switch. Connecting a resistor (e.g., 220 Ω) between ILIM and VIN sets the maximum switch current to 400 mA, protecting against inductor saturation and thermal overload. Leaving ILIM tied directly to VIN enables full 1 A capability, as documented in the "PIN DESCRIPTIONS" and "CURRENT LIMIT" specifications.
Is the ADP1111AR-3.3 compatible with surface-mount inductors?
Yes, the ADP1111AR-3.3 is explicitly designed for use with surface-mount inductors, as highlighted in the "FEATURES" list ("Utilizes Surface Mount Inductors") and validated in the "TYPICAL APPLICATION" schematic (Figure 1) using Sumida CD54-220K, a standard SMD inductor. Recommended values range from 15 µH to 100 µH with saturation current ratings of 300 mA to 1 A.
ADP1111AR-3.3 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-3.3 FAQ
1.How can I place an order for ADP1111AR-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1111AR-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 ADP1111AR-3.3 reliable?
The price and inventory of ADP1111AR-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 ADP1111AR-3.3 is usually 5 days.
3.What payment methods are accepted for ADP1111AR-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1111AR-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1111AR-3.3?
ADP1111AR-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1111AR-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 ADP1111AR-3.3?
For technical support, including ADP1111AR-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1111AR-3.3 requirements.
6.How does Aetrix verify that ADP1111AR-3.3 is sourced from the original manufacturer or authorized distributors?
All ADP1111AR-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 ADP1111AR-3.3 meets industry standards.
7.What is the process for return or replacement of ADP1111AR-3.3?
All ADP1111AR-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1111AR-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 ADP1111AR-3.3 part is unused and in its original packaging.
Return procedure for ADP1111AR-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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