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Analog Devices Inc. ADP1111ARZ
- Part No.:
- ADP1111ARZ
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1111ARZ.pdf
- Description:
- IC REG BUCK BST ADJ 400MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,986
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Product details
Overview
ADP1111ARZ 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, delivers up to 200 mA at 5 V in step-down mode, and supports low-battery detection via open-collector gain block AO. Used in portable instruments and battery backup supplies.
For engineers reviewing the ADP1111ARZ datasheet, ADP1111ARZ pinout, ADP1111ARZ application, or ADP1111ARZ equivalent, this page provides verified functional identity, confirmed SO-8 package mapping, validated 8-pin terminal roles, real-world step-up/step-down conversion parameters, and two rigorously cross-checked alternative parts for voltage regulation in space-constrained, low-quiescent-current designs.
Technical Context
The ADP1111ARZ implements a gated-oscillator control architecture with internal 1.25 V reference and comparator-based feedback loop, enabling stable regulation without external compensation. Its dual-access power switch (SW1 collector, SW2 emitter) allows reconfigurable topology-step-up (SW2 to GND), step-down (SW1 to VIN), or inverting-using only three external components.
Current limiting is resistor-programmable via ILIM pin with −0.3%/°C temperature coefficient; the AO pin provides open-collector output for low-battery detection, post-regulation, or undervoltage lockout. Quiescent current drops to 300 μA when the switch is off, supporting micropower operation across 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2 V to 12 V (step-up), up to 30 V (step-down); enables single-supply operation across primary and secondary battery chemistries. |
| Oscillator Frequency | 54–88 kHz typ. 72 kHz; fixed-frequency operation simplifies EMI filtering and inductor selection. |
| Output Voltage Options | Adjustable (via FB divider) or factory-fixed 3.3 V / 5 V / 12 V; eliminates need for external resistors in standard-output applications. |
| Internal Power Switch | 1 A rated, 0.65 V saturation at 650 mA (VIN = 3 V, step-up); supports compact, integrated power stage without external MOSFET. |
| Quiescent Current | 300–500 μA (switch off); critical for battery life extension in always-on portable systems. |
| Current Limit Accuracy | 400 mA typical with 220 Ω ILIM-to-VIN resistor; programmable overtemperature-stable range prevents inductor saturation. |
| Feedback Reference | 1.25 V ±5% comparator threshold; sets precise output regulation point independent of supply variation. |
Pinout & Package
ADP1111ARZ 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 marked by notch or dot; thermal performance suitable for ≤500 mW dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM | Current limit programming input | Connects to VIN directly or via resistor (e.g., 220 Ω) to set 400 mA max switch current; open-circuit disables limit. |
| VIN | Main power input | Supplies bias and switch drive; accepts 2–30 V; must remain within absolute max rating of 36 V. |
| SW1 | Collector of internal NPN switch | In step-up: drives inductor; in step-down: connects to input rail; withstands up to 50 V transient. |
| GND | Analog and power ground reference | Common return for reference, feedback, and switch emitter; requires low-impedance PCB connection. |
| VIN (Pin 5) | Secondary input connection point | Duplicate VIN pin for high-current routing; electrically identical to Pin 2; must be tied together. |
| SW2 | Emitter of internal NPN switch | In step-up: connected to GND; in step-down: drives inductor; must not fall below −0.5 V. |
| FB/SENSE | Feedback input or fixed-voltage sense node | On ADP1111ARZ (adjustable version): connects to resistor divider; on fixed versions: internally tied to laser-trimmed resistors. |
| SET | Non-inverting input of auxiliary gain block | Accepts resistor divider from VIN for low-battery detection; open if unused; bias current 270–400 nA. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports step-up, step-down, and inverting configurations via SW1/SW2 pin reassignment-no change to controller IC required. |
| Micropower Operation | 300 μA quiescent current in shutdown state extends battery runtime in standby modes of remote controls and flash memory programmers. |
| Programmable Overcurrent Protection | Single external resistor sets switch current limit with −0.3%/°C tempco-enables robust design across industrial temperature range. |
| Integrated Low-Battery Detector | AO pin provides open-collector output sinking 300 μA; configured with SET pin divider to assert at user-defined VIN threshold. |
| Fixed-Output Variant Compatibility | Same SO-8 footprint and pinout as ADP1111-5ARZ and ADP1111-12ARZ-allows drop-in replacement where output voltage is standardized. |
Applications
| Laptop Power Management | Flash Memory VPP Generation |
|---|---|
Use Scenario: Generating 5 V or 12 V from a 3 V or 9 V battery pack to power logic rails or display backlight drivers in ultra-thin notebooks. IC Role / Device Role / Timing Role: Step-up/step-down switching regulator providing regulated output with <500 μA quiescent current during sleep states. Use Value: Enables dual-mode operation (3 V→5 V boost, 12 V→5 V buck) using one IC, reducing BOM count and PCB area versus discrete solutions. | Use Scenario: Producing +12 V programming voltage (VPP) for NOR/NAND flash memory in embedded controllers and firmware update modules. IC Role / Device Role / Timing Role: Adjustable-output DC-DC converter delivering 12 V at 40 mA from a 6 V end-of-life battery source. Use Value: Meets tight VPP tolerance (±5%) with 11.4–12.6 V output range and supports intermittent high-current pulses without thermal shutdown. |
| Battery Backup Supply | Portable Instrument Power |
Use Scenario: Maintaining 3.3 V or 5 V system rail during main power failure in medical data loggers or smart meters using Li-ion or alkaline backup cells. IC Role / Device Role / Timing Role: Step-down regulator converting 9 V or 12 V backup battery to stable 5 V, with low-battery detection signaling via AO pin. Use Value: 2 V minimum input enables operation down to single-cell alkaline (1.5 V × 2), extending usable battery capacity beyond conventional regulators. | Use Scenario: Powering analog front-ends and microcontrollers in handheld test equipment operating from 4.5–5.5 V USB or coin-cell sources. IC Role / Device Role / Timing Role: Inverting regulator generating −5 V from +5 V input for op-amp dual supplies in precision measurement circuits. Use Value: Eliminates need for separate negative charge pump IC; achieves <30 mV output ripple with OS-CON capacitor per datasheet Figure 17. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADP1111-5ARZ | Factory-trimmed 5 V fixed output; no external FB resistors required; identical SO-8 package and pinout. | Eliminates feedback network for 5 V systems but loses adjustability; same thermal and layout constraints. | Select when output voltage is fixed at 5 V and board space is constrained-no redesign needed. |
| MAX630CPA+ | 5 V fixed-output, 200 kHz oscillator, 300 mA switch, 8-pin DIP only; no step-down capability; higher IQ (1.2 mA). | Limited to step-up only; unsuitable for 12 V→5 V conversion; requires through-hole assembly. | Consider only for legacy DIP designs requiring 5 V boost with minimal external parts-no SO-8 compatibility. |
Compared with ADP1111-5ARZ, the ADP1111ARZ offers full adjustability and topology flexibility at the cost of two external resistors; compared with MAX630CPA+, it adds step-down/inverting modes, cuts quiescent current by 60%, and supports surface-mount assembly-making it superior for modern portable and battery-critical systems.
Availability
ADP1111ARZ is available at Aetrix Electronics and suitable for laptop power management, flash memory VPP generation, battery backup supplies, portable instrument power, and uninterruptible supply designs requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for ADP1111ARZ 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, with design centers worldwide and ISO 9001-certified manufacturing.
The ADP1111ARZ belongs to Analog Devices' micropower DC-DC converter product line, engineered specifically for battery-powered portable electronics requiring multi-topology voltage conversion, ultra-low standby current, and minimal external component count.
FAQ
What is the maximum input voltage the ADP1111ARZ can handle in step-down mode?
The ADP1111ARZ supports up to 30 V input voltage in step-down mode, as specified in the Absolute Maximum Ratings table. This allows direct use with 24 V industrial rails or 12 V automotive systems with margin. However, sustained operation above 12 V requires careful thermal design due to increased switch conduction loss and SO-8 package power dissipation limits of 500 mW.
Can the ADP1111ARZ be used to generate a negative output voltage?
Yes, the ADP1111ARZ supports positive-to-negative conversion by configuring SW2 as the inductor driver and SW1 connected to ground, per Figure 22 in the datasheet. It delivers −5 V at 50 mA from a +4.5 V to +5.5 V source using a 56 μH inductor and Schottky diode, with peak switch current held below 650 mA.
How does the ADP1111ARZ implement low-battery detection?
The ADP1111ARZ uses its uncommitted gain block: the SET pin serves as the non-inverting input referenced to the internal 1.25 V, while AO provides an open-collector output sinking 300 μA. A resistor divider from VIN to GND at SET triggers AO low when input falls below the programmed threshold-enabling system-level brownout response without external comparators.
What is the purpose of the ILIM pin on the ADP1111ARZ?
The ILIM pin on the ADP1111ARZ programs the maximum switch current by connecting a resistor between ILIM and VIN. A 220 Ω resistor sets 400 mA limit; omitting the resistor ties ILIM to VIN for full 1 A capability. This protects the internal switch and external inductor from saturation during startup or overload, with −0.3%/°C temperature coefficient for stable trip point.
Is the ADP1111ARZ pin-compatible with the ADP1111-5ARZ?
Yes, the ADP1111ARZ is fully pin-compatible with the ADP1111-5ARZ: both use identical 8-lead SOIC packages, share identical pin functions (ILIM, VIN, SW1, GND, VIN, SW2, FB/SENSE, SET), and require no PCB layout changes. The only difference is that ADP1111-5ARZ has internal laser-trimmed resistors fixing VOUT to 5 V, while ADP1111ARZ requires external FB resistors for adjustment.
ADP1111ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 400mA (Switch)
- Frequency - Switching:
- 72kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADP1111ARZ FAQ
1.How can I place an order for ADP1111ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1111ARZ 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 ADP1111ARZ reliable?
The price and inventory of ADP1111ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1111ARZ is usually 5 days.
3.What payment methods are accepted for ADP1111ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1111ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1111ARZ?
ADP1111ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1111ARZ 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 ADP1111ARZ?
For technical support, including ADP1111ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1111ARZ requirements.
6.How does Aetrix verify that ADP1111ARZ is sourced from the original manufacturer or authorized distributors?
All ADP1111ARZ 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 ADP1111ARZ meets industry standards.
7.What is the process for return or replacement of ADP1111ARZ?
All ADP1111ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADP1111ARZ, 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 ADP1111ARZ part is unused and in its original packaging.
Return procedure for ADP1111ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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