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Analog Devices Inc. ADP1108AR-12
- Part No.:
- ADP1108AR-12
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1108AR-12.pdf
- Description:
- IC REG BUCK BOOST 12V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,067
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Product details
Overview
ADP1108AR-12 from Analog Devices is a micropower step-up/step-down DC-DC converter IC with fixed 12 V output, internal 1 A power switch, 19 kHz oscillator, and programmable current limit. It operates from 2.0 V to 30 V input, delivers up to 300 mA at 5 V in step-down mode, and targets battery-powered LCD bias, portable instrumentation, and peripheral power rails.
For engineers reviewing the ADP1108AR-12 datasheet, ADP1108AR-12 pinout, ADP1108AR-12 application, or ADP1108AR-12 equivalent, key selection factors include its dual-mode topology support, 90 µA quiescent current in no-load boost configuration, ±5% output voltage tolerance at 12 V, and SO-8 package compatibility with space-constrained embedded designs.
Technical Context
The ADP1108AR-12 implements a gated-oscillator control architecture with an internal 1.245 V reference and comparator-based regulation loop. Its dual-access power transistor (SW1 collector, SW2 emitter) enables both step-up and step-down configurations without external switches.
Current limiting is resistor-programmable via ILIM-to-VIN connection, with factory-trimmed feedback resistors setting nominal 12.0 V output (11.4–12.6 V range). The auxiliary gain block (SET/AO pins) supports low-battery detection or post-regulation functions independent of main regulation path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.0 V ±5% (11.4–12.6 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 single-cell Li-ion down to end-of-life and industrial 24 V rails |
| Quiescent Current | 90 µA typical at no load in boost mode; enables >1-year battery life in low-duty-cycle sensor nodes |
| Oscillator Frequency | 19 kHz typical; 36 µs ON / 17 µs OFF timing optimized for 3× VIN-to-VOUT ratios (e.g., 4 V → 12 V) |
| Internal Power Switch | 1 A rated NPN transistor with 0.75 V saturation at 650 mA (VIN = 5 V); eliminates need for external MOSFET in <300 mA applications |
| Output Hysteresis | 50–100 mV; ensures stable regulation under dynamic load transients without external compensation |
| Operating Temperature | 0°C to +70°C; validated for commercial portable equipment environments |
Pinout & Package
ADP1108AR-12 is housed in an 8-pin SOIC (SO-8) package with standard 1.27 mm pitch, compatible with automated PCB assembly and thermal relief pad layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Current Limit Programming Input | Connect to VIN for full 1 A switch current; 87.4 kΩ resistor sets ~500 mA limit per fixed-output variant design |
| 2 VIN | Main Power Input | Supplies internal circuitry and power switch; accepts 2.0–30 V across step-up/step-down modes |
| 3 SW1 | Power Switch Collector | In step-up: drives inductor; in step-down: connects to input rail; handles peak currents up to 1.5 A |
| 4 SW2 | Power Switch Emitter | In step-up: tied to GND; in step-down: drives inductor; must not exceed –0.5 V below ground |
| 5 FB/SENSE | Feedback Input (Fixed Mode) | Internally connected to trimmed resistor divider; connect directly to 12 V output for regulation |
| 6 SET | Auxiliary Amplifier Non-Inverting Input | Accepts resistor divider from VIN for low-battery detection; referenced to internal 1.245 V |
| 7 AO | Auxiliary Gain Block Output | Open-collector NPN output sinking 100 µA; usable as UVLO flag or linear post-regulator driver |
| 8 GND | Analog and Power Ground | Common reference for all internal blocks; requires low-impedance PCB plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode topology support | Single IC configures as boost (2–12.6 V IN → 12 V OUT) or buck (up to 30 V IN → 12 V OUT) with pin-strapping only |
| Ultra-low quiescent current | 90 µA typical in no-load boost mode enables multi-year operation from coin cells in maintenance-free sensors |
| Integrated 1 A power switch | Eliminates external transistor and gate driver, reducing BOM count and layout area by ≥4 components |
| Programmable current limit | Resistor from ILIM to VIN sets switch current threshold; prevents thermal runaway during short-circuit events |
| On-chip auxiliary gain block | Configurable as low-battery detector (trip at 1.245 V), error amplifier, or UVLO circuit without external op-amps |
Applications
| LCD Bias Generation | Portable Instrumentation Power |
|---|---|
Use Scenario: Generating +12 V bias for STN/TN LCD panels in handheld test meters and medical monitors. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing stable 12 V rail from 3.7 V Li-ion battery with minimal ripple. Use Value: 50–100 mV output hysteresis ensures flicker-free display operation during battery voltage sag; 90 µA IQ extends runtime between charges. |
Use Scenario: Supplying regulated 12 V to analog front-end amplifiers and ADC references in battery-powered oscilloscopes. IC Role / Device Role / Timing Role: Step-up converter boosting 2 AA cells (2.0–3.2 V) to precise 12 V for high-resolution signal conditioning. Use Value: Laser-trimmed 12 V output (±5%) eliminates calibration drift; SO-8 package fits compact 4-layer PCBs with thermal vias. |
| Peripheral Card Power | Battery Backup Supply |
Use Scenario: Providing isolated 12 V to add-on communication cards (RS-232, CAN) in industrial controllers. IC Role / Device Role / Timing Role: Step-down regulator converting 24 V system rail to 12 V logic interface supply with reverse-polarity protection. Use Value: 30 V max input rating withstands 24 V bus transients; internal switch saturation voltage <1.0 V at 650 mA minimizes heat dissipation. |
Use Scenario: Maintaining 12 V backup rail during main power failure in security alarm panels using NiMH battery packs. IC Role / Device Role / Timing Role: Low-quiescent-current buck converter sustaining critical memory and RTC circuits from 12 V battery. Use Value: 90 µA IQ reduces standby drain to <1% of battery capacity per month; AO pin signals low-battery condition to microcontroller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX638ACSA+ | Fixed 12 V output, 100 µA IQ, but limited to 100 mA output current and 16.5 V max input | Suitable only for ultra-low-power 12 V bias; cannot replace ADP1108AR-12 in >200 mA loads or 24 V systems | Select when board space is critical and load current ≤100 mA; verify input voltage stays <16.5 V |
| TPS61040DRVR | Adjustable output (1.8–28 V), 28 V max input, 280 mA output, but requires external feedback resistors and has 55 µA IQ | Offers flexibility for non-12 V rails; lacks integrated 12 V trim and auxiliary gain block functionality | Choose for variable-output designs needing higher efficiency at light loads; add external components for 12 V setpoint |
Compared with MAX638ACSA+ and TPS61040DRVR, ADP1108AR-12 uniquely combines fixed 12 V accuracy, 300 mA capability in step-down mode, and on-chip auxiliary amplifier-enabling single-chip solutions for battery-backed instrumentation where precision, integration, and low IQ are jointly required.
Availability
ADP1108AR-12 is available at Aetrix Electronics and suitable for LCD bias generation, portable instrumentation power, and peripheral card power requiring stable component supply with guaranteed long-term sourcing.
Supply support for ADP1108AR-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 ADP1108 product line delivers micropower DC-DC conversion for battery-operated portable electronics, emphasizing ultra-low quiescent current, dual-mode topology flexibility, and integrated power switching to reduce system-level component count.
FAQ
What is the output voltage tolerance of the ADP1108AR-12?
The ADP1108AR-12 provides a fixed 12 V output with guaranteed tolerance of ±5% (11.4 V to 12.6 V) across temperature and load conditions, achieved via on-die laser-trimmed resistors that eliminate external feedback components and ensure long-term stability without calibration.
Can the ADP1108AR-12 operate in step-down mode from a 24 V input?
Yes, the ADP1108AR-12 supports step-down operation with input voltages up to 30 V, making it fully compatible with 24 V industrial rails. In this configuration, SW1 connects to VIN and SW2 drives the inductor, delivering regulated 12 V output while maintaining 90 µA quiescent current at no load.
How is current limiting implemented on the ADP1108AR-12?
Current limiting on the ADP1108AR-12 is set by connecting a resistor between ILIM and VIN. For the ADP1108AR-12 variant, a nominal 87.4 kΩ resistor programs ~500 mA switch current limit, protecting the internal 1 A transistor during overload or short-circuit conditions without requiring external sensing circuitry.
Does the ADP1108AR-12 require external compensation components?
No, the ADP1108AR-12 uses comparator-based hysteretic control with built-in 50–100 mV output hysteresis, eliminating the need for external compensation networks. This simplifies design, reduces component count, and ensures stable regulation across input voltage and load variations without loop stability analysis.
What package type is used for the ADP1108AR-12?
The ADP1108AR-12 is supplied in an 8-pin SOIC (SO-8) package with standard 1.27 mm lead pitch, RoHS-compliant finish, and thermal performance validated for continuous operation at 70°C ambient. The package footprint matches industry-standard SO-8 footprints for drop-in PCB compatibility.
ADP1108AR-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADP1108
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 19kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADP1108AR-12 FAQ
1.How can I place an order for ADP1108AR-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1108AR-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 ADP1108AR-12 reliable?
The price and inventory of ADP1108AR-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1108AR-12 is usually 5 days.
3.What payment methods are accepted for ADP1108AR-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1108AR-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1108AR-12?
ADP1108AR-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1108AR-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 ADP1108AR-12?
For technical support, including ADP1108AR-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1108AR-12 requirements.
6.How does Aetrix verify that ADP1108AR-12 is sourced from the original manufacturer or authorized distributors?
All ADP1108AR-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 ADP1108AR-12 meets industry standards.
7.What is the process for return or replacement of ADP1108AR-12?
All ADP1108AR-12 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1108AR-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 ADP1108AR-12 part is unused and in its original packaging.
Return procedure for ADP1108AR-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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