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Analog Devices Inc. ADP1111AN
- Part No.:
- ADP1111AN
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADP1111AN.pdf
- Description:
- IC REG SWITCHING ADJ VLT 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,800
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Product details
Overview
ADP1111AN from Analog Devices is a micropower, step-up/step-down switching regulator IC with internal 1 A power switch, 72 kHz oscillator, and adjustable or fixed 3.3 V/5 V/12 V output. It operates from 2 V to 30 V input, supports boost, buck, and inverting topologies, and delivers up to 200 mA at 5 V in step-down mode from 12 V input - ideal for portable instrument power rails and battery-backed peripherals.
For engineers reviewing the ADP1111AN datasheet, ADP1111AN pinout, ADP1111AN application, or ADP1111AN equivalent, this page provides verified functional identity (switch-mode DC-DC controller), confirmed topology flexibility (boost/buck/inverting), validated current limit programmability (via ILIM resistor), and exact package mapping (8-lead plastic DIP, N-8).
Technical Context
The ADP1111AN uses a gated-oscillator control architecture with a 1.25 V internal reference and comparator-based feedback loop. Its dual-access power switch (SW1 collector, SW2 emitter) enables reconfigurable topology - SW2 grounded for boost, SW1 tied to VIN for buck - without external transistor additions.
It integrates a user-configurable gain block (AO/SET pins) for low-battery detection or post-regulation, and features temperature-stable 72 kHz ±18 kHz oscillator operation across –40°C to +85°C. Quiescent current remains ≤500 μA in shutdown, enabling micropower operation in battery-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2 V to 30 V - supports wide battery chemistries (alkaline, NiCd, Li-ion) and unregulated industrial rails. |
| Output Modes | Step-up (boost), step-down (buck), inverting - selectable via external component routing, no mode pin required. |
| Oscillator Frequency | 54–88 kHz typical - fixed-frequency operation simplifies EMI filtering; 7 μs ON time enables efficient 2× VIN/VOUT conversion ratios. |
| Internal Switch Rating | 1 A peak, 1.5 A absolute max - integrated bipolar transistor eliminates external switch need in sub-200 mA applications. |
| Quiescent Current | 300–500 μA - enables >1-year shelf life in remote controls and flash memory VPP generators. |
| Feedback Reference | 1.25 V ±5% - precision reference enables accurate output regulation with standard resistor dividers. |
| Current Limit Control | Resistor-programmable (e.g., 220 Ω → 400 mA) - protects inductor and switch during load transients or short circuits. |
Pinout & Package
ADP1111AN is housed in an 8-lead plastic DIP (N-8) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Current limit programming input | Connect to VIN directly for full 1 A switch current; add resistor to VIN to reduce max switch current (e.g., 220 Ω → 400 mA). |
| 2 SW1 | Collector of internal power switch | In boost: drives inductor; in buck: connects to VIN; voltage rating up to 50 V - defines high-side switching node. |
| 3 SW2 | Emitter of internal power switch | In boost: connects to GND; in buck: drives inductor; must not go below –0.5 V - defines low-side switching node. |
| 4 GND | Power and signal ground reference | Common return for internal circuitry, feedback network, and external components - requires low-impedance PCB connection. |
| 5 VIN | Main input supply connection | Accepts 2–30 V DC; powers internal bias circuits and supplies current to switch - decoupling capacitor mandatory. |
| 6 AO | Open-collector gain block output | Sinks up to 300 μA; used for low-battery detection, UVLO, or error amplification - requires external pull-up resistor. |
| 7 SET | Non-inverting input of gain block | Accepts voltage divider from VIN for threshold setting; bias current 270–400 nA - enables precise undervoltage trip points. |
| 8 FB/SENSE | Feedback input / output voltage sense | Compares against 1.25 V reference; for adjustable version, connects to resistor divider; for fixed versions, ties directly to output. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports boost, buck, and inverting configurations via pin routing - reduces BOM count and design iterations. |
| Programmable Current Limit | Single external resistor sets switch current threshold (e.g., 400 mA, 600 mA) - prevents inductor saturation and thermal runaway. |
| Micropower Operation | 300 μA quiescent current in shutdown - extends battery life in intermittent-use devices like remote controls and flash programmers. |
| Integrated Gain Block | AO/SET pins form configurable comparator amplifier - enables low-battery detection without additional op-amps or comparators. |
| Fixed & Adjustable Outputs | Pin-compatible variants (ADP1111AN-3.3/5/12) include laser-trimmed resistors - eliminates external feedback network for standard voltages. |
Applications
| Portable Instrument Power | Laptop Peripheral Supply |
|---|---|
Use Scenario: Generating stable 5 V rail from variable 9–12 V battery pack in handheld multimeters or data loggers. IC Role / Device Role / Timing Role: Step-down DC-DC controller regulating output under varying load and input conditions. Use Value: Delivers 200 mA at 5 V from 12 V input with <500 μA quiescent current - preserves battery runtime during measurement standby. |
Use Scenario: Providing isolated 3.3 V logic supply for USB-to-serial adapter cards in notebook expansion bays. IC Role / Device Role / Timing Role: Adjustable-output boost converter stepping 3 V system rail to 3.3 V for interface ICs. Use Value: Achieves 100 mA at 3.3 V from 3 V input using only 3 external components - minimizes board space on compact add-on cards. |
| Flash Memory VPP Generator | Battery Backup Supply |
Use Scenario: Generating +12 V programming voltage for NOR/NAND flash memory in embedded controllers. IC Role / Device Role / Timing Role: Fixed-output boost converter operating from main 3.3 V or 5 V system rail. Use Value: Delivers regulated 12 V ±5% at 40 mA with 72 kHz switching - avoids EMI-sensitive analog sections while meeting JEDEC VPP specs. |
Use Scenario: Maintaining real-time clock (RTC) and SRAM backup during main power failure in industrial PLCs. IC Role / Device Role / Timing Role: Inverting DC-DC converter generating –5 V from 3 V coin cell to bias RTC backup circuitry. Use Value: Supports continuous operation from CR2032 with <500 μA quiescent draw - enables >10-year backup lifetime per battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX630CPA+ | Fixed 5 V output only; 100 kHz oscillator; 350 mA switch; SO-8 package only | Lacks adjustable output and topology flexibility - suitable only for dedicated 5 V boost applications | Select when fixed 5 V output suffices and DIP packaging is not required |
| TPS61040DRVR | 2.5–6 V input; 28 V output max; 0.5 A switch; 500 kHz switching; 6-pin SOT-23 | Higher frequency enables smaller magnetics but lacks buck/inverting modes and ILIM programming | Prefer for space-constrained boost-only designs needing >100 mA at >12 V output |
Compared with MAX630CPA+ and TPS61040DRVR, ADP1111AN offers unique topology reconfigurability (boost/buck/invert), DIP packaging for prototyping, and resistor-programmable current limit - making it optimal for multi-rail portable systems where layout flexibility and long battery life are critical.
Availability
ADP1111AN is available at Aetrix Electronics and suitable for portable instrumentation, battery-backed peripherals, and flash memory programming requiring stable component supply with long-term lifecycle support.
Supply support for ADP1111AN 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, headquartered in Norwood, MA.
The ADP1111AN belongs to Analog Devices' micropower DC-DC controller product line, designed specifically for battery-operated and energy-sensitive applications demanding topology flexibility and ultra-low quiescent current.
FAQ
What is the maximum output current capability of the ADP1111AN in step-down mode?
The ADP1111AN delivers up to 200 mA at 5 V from a 12 V input in step-down mode, as confirmed in the General Description section of the datasheet. This assumes proper inductor selection (e.g., 56–68 μH, ≥650 mA saturation current) and thermal management. The internal switch current limit can be reduced via the ILIM pin to match lower-load requirements while maintaining stability.
Can the ADP1111AN operate in inverting configuration, and what are the key layout considerations?
Yes, the ADP1111AN supports inverting (positive-to-negative) operation using its dual-access switch terminals (SW1/SW2). As shown in Figure 22 of the datasheet, SW2 connects to the inductor and SW1 to ground. Critical layout requirements include minimizing SW2 loop area to avoid violating the –0.5 V absolute minimum rating and using Schottky diodes to prevent negative voltage excursions beyond specification limits.
What is the purpose of the AO and SET pins on the ADP1111AN, and how are they typically configured?
The AO (open-collector output) and SET (non-inverting input) pins form a configurable gain block referenced to the internal 1.25 V reference. Typically, a resistor divider from VIN to GND connects to SET, causing AO to sink current when input voltage drops below a programmed threshold - enabling low-battery detection. AO requires an external pull-up resistor (e.g., 10 kΩ to VIN) to function as a logic-level alert signal.
Does the ADP1111AN require external compensation components for loop stability?
No, the ADP1111AN does not require external compensation components. Its comparator-based control loop with built-in hysteresis ensures inherent stability across all operating conditions, as explicitly stated in the Theory of Operation section: "ensures loop stability without requiring external components for frequency compensation." This simplifies design and reduces bill-of-materials count.
How does the ADP1111AN's current limit function interact with different input voltages in step-down mode?
In step-down mode, peak switch current increases with higher VIN. Without ILIM programming, the ADP1111AN may exceed its 1.5 A absolute maximum rating at elevated inputs. Figure 6 in the datasheet shows RLIM resistor values (e.g., 560 Ω for 600 mA limit) that maintain constant peak current across VIN range - preventing saturation and improving efficiency in wide-input applications.
ADP1111AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADP1111AN FAQ
1.How can I place an order for ADP1111AN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1111AN 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 ADP1111AN reliable?
The price and inventory of ADP1111AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1111AN is usually 5 days.
3.What payment methods are accepted for ADP1111AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1111AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1111AN?
ADP1111AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1111AN 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 ADP1111AN?
For technical support, including ADP1111AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1111AN requirements.
6.How does Aetrix verify that ADP1111AN is sourced from the original manufacturer or authorized distributors?
All ADP1111AN 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 ADP1111AN meets industry standards.
7.What is the process for return or replacement of ADP1111AN?
All ADP1111AN units undergo pre-shipment inspection (PSI). If there is an issue with ADP1111AN, 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 ADP1111AN part is unused and in its original packaging.
Return procedure for ADP1111AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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