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Analog Devices Inc. ADP1108AN-12
- Part No.:
- ADP1108AN-12
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADP1108AN-12.pdf
- Description:
- IC REG BUCK BOOST 12V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,678
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Product details
Overview
ADP1108AN-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, programmable current limit, and auxiliary gain block for low-battery detection. It operates from 2.0 V to 30 V input, delivers up to 300 mA at 5 V in step-down mode, and consumes only 90 µA quiescent current. It is used in portable instruments and battery backup supplies requiring stable, low-power voltage conversion.
For engineers reviewing the ADP1108AN-12 datasheet, ADP1108AN-12 pinout, ADP1108AN-12 application, or ADP1108AN-12 equivalent, key selection criteria include its 12 V fixed output accuracy (±5% over load/temperature), 19 kHz oscillator frequency, SW1/SW2 dual-transistor terminal architecture enabling both boost and buck topologies, and compatibility with standard Schottky diodes and 47–330 µH inductors.
Technical Context
The ADP1108AN-12 implements a gated-oscillator control scheme with internal 1.245 V reference and comparator hysteresis (5–12 mV), enabling stable regulation without external compensation. Its dual-access power transistor (SW1 collector, SW2 emitter) supports reconfigurable step-up and step-down operation using only three external components.
Current limiting is set via resistor between ILIM and VIN (e.g., 87.4 kΩ for 12 V version), while the auxiliary gain block (SET/AO pins) provides open-collector output capable of sinking 100 µA - usable as low-battery detector or UVLO circuit. The device operates across 0°C to +70°C and features 36 µs typical switch ON time.
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 ensure accuracy without external feedback network. |
| Input Voltage Range | 2.0–12.6 V (step-up), up to 30 V (step-down); enables use with single-cell Li-ion, multi-cell alkaline, or industrial rails. |
| Quiescent Current | 90 µA (typical, no load); enables >1-year battery life in always-on portable instrumentation. |
| Oscillator Frequency | 19 kHz (typical); fixed frequency simplifies EMI filtering and supports continuous conduction mode at ~3× VIN/VOUT ratios. |
| Switch Current Limit | Programmable up to 500 mA (via ILIM resistor); prevents thermal runaway during overload or short-circuit transients. |
| Power Switch Rating | Internal NPN transistor with 1.5 A absolute max switch current and 0.75 V saturation voltage at 650 mA (VIN = 3 V). |
| Output Hysteresis | 50–100 mV (for ADP1108AN-12); stabilizes regulation loop and reduces switching chatter near regulation threshold. |
Pinout & Package
ADP1108AN-12 is housed in an 8-pin plastic DIP (N-8) package with through-hole mounting and 0.3-inch width. Pin spacing is 0.1 inch, compatible with standard prototyping and PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM | Current Limit Programming Input | Connect to VIN directly for full 500 mA limit; add resistor to VIN to reduce switch current - e.g., 220 Ω sets ~400 mA. |
| VIN | Main Power Input | Supplies bias and drives internal oscillator; accepts 2.0–30 V; must be decoupled with ≥1 µF ceramic capacitor near pin. |
| SW1 | Power Transistor Collector | In step-up: connects to inductor/diode node; in step-down: connects to VIN rail - defines topology configuration. |
| SW2 | Power Transistor Emitter | In step-up: connects to GND; in step-down: connects to inductor - must not go below –0.5 V (Schottky diode required). |
| FB/SENSE | Feedback Input (Fixed Mode) | Internally connected to laser-trimmed divider for 12 V output; connect directly to regulated output for closed-loop control. |
| SET | Auxiliary Amplifier Non-Inverting Input | Accepts resistor divider from VIN to GND; used with AO pin to implement low-battery detection at user-defined threshold. |
| AO | Auxiliary Gain Block Output | Open-collector NPN output sinking up to 100 µA; active-low signal for UVLO or comparator interface. |
| GND | Analog and Power Ground | Single ground reference for all internal blocks; requires low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Reconfigurable Topology Support | Single IC supports step-up (boost), step-down (buck), and inverting configurations via SW1/SW2 pin routing - eliminates need for separate converters. |
| Integrated Low-Battery Detection | On-chip gain block (SET/AO) enables precise, temperature-stable undervoltage warning without external comparators or references. |
| Minimal External Component Count | Only inductor, diode, and output capacitor required for basic operation - reduces BOM cost and board area by >40% vs. controller+MOSFET solutions. |
| Robust Switch Protection | Internal current limit with 2 µs response delay and thermal foldback prevent damage during transient overloads or output shorts. |
| Wide Input Compatibility | Operates down to 2.0 V startup (1.8 V typical), supporting end-of-life battery voltages in AA/AAA-powered devices. |
Applications
| Portable Instrumentation Power | Battery Backup Supply |
|---|---|
Use Scenario: Handheld multimeter powered by two AA cells (1.8–3.2 V range) requiring stable 12 V for LCD bias and op-amp rails. IC Role / Device Role / Timing Role: Primary DC-DC converter generating regulated 12 V output in step-up mode; controls switching timing via internal 19 kHz oscillator. Use Value: Enables >500-hour runtime on alkaline cells while maintaining ±5% output accuracy across temperature and load variation. |
Use Scenario: Industrial PLC with non-volatile memory needing clean 12 V backup during AC mains failure. IC Role / Device Role / Timing Role: Step-down regulator converting 24 V system rail to 12 V backup bus; uses SW1–VIN and SW2–inductor connection. Use Value: Delivers 300 mA at 12 V with <90 µA quiescent draw, extending supercapacitor hold-up time by 2.3× vs. linear regulators. |
| LCD Bias Generation | Peripheral Card Voltage Translation |
Use Scenario: Embedded display module requiring +12 V and –5 V rails from a 5 V logic supply. IC Role / Device Role / Timing Role: Configured in positive-to-negative inverting mode using SW1/SW2 terminals; oscillator sets charge/discharge timing. Use Value: Generates clean, low-noise negative rail with <100 mV ripple using OS-CON output capacitor - avoids dedicated inverter IC. |
Use Scenario: PCIe add-in card needing 12 V from host 3.3 V or 5 V auxiliary rail for high-side MOSFET gate drive. IC Role / Device Role / Timing Role: Step-up converter boosting 5 V to 12 V; FB pin tied directly to output per fixed-voltage configuration. Use Value: Eliminates need for external feedback resistors and supports hot-plug operation with fast start-up (<100 µs) from 2.0 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX638ACPA+ | Fixed 12 V output, 100 µA IQ, 100 kHz switching, SO-8 only; no auxiliary gain block or ILIM programming. | Lacks low-battery detection and adjustable current limit; limited to step-up mode only. | Choose when higher switching frequency and smaller inductor size are prioritized over topology flexibility. |
| TPS61040DRVR | Adjustable 1.8–28 V output, 28 µA IQ, 500 kHz, integrated Schottky, 0.5 A switch; no step-down capability. | Optimized for ultra-low IQ and compact layout but cannot configure as buck converter or support 30 V input. | Prefer for battery-powered sensors where 28 µA quiescent current outweighs need for dual-mode operation. |
Compared with MAX638ACPA+ and TPS61040DRVR, the ADP1108AN-12 uniquely supports both step-up and step-down modes in a single package, includes a configurable current limit and on-chip gain block - making it suitable for space-constrained, multi-rail portable systems where design reuse and functional integration reduce total component count.
Availability
ADP1108AN-12 is available at Aetrix Electronics and suitable for portable instrumentation power, battery backup supplies, LCD bias generation, and peripheral card voltage translation requiring stable component supply and long-term industrial availability.
Supply support for ADP1108AN-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 since 1965.
The ADP1108 product line was designed for ultra-low-power, topology-flexible DC-DC conversion in battery-operated and energy-sensitive applications - emphasizing minimal external components, wide input range, and integrated protection features.
FAQ
What is the output voltage tolerance of the ADP1108AN-12 under full-load and temperature variation?
The ADP1108AN-12 delivers 12.0 V with a guaranteed tolerance of ±5% (11.4 V to 12.6 V) across full load (0–300 mA), input voltage (2.0–12.6 V), and operating temperature (0°C to +70°C). This specification is ensured by on-die laser-trimmed resistors and internal 1.245 V reference with 0.4%/V line regulation - eliminating need for external calibration.
Can the ADP1108AN-12 operate in step-down mode, and what are the input voltage limits?
Yes, the ADP1108AN-12 supports step-down (buck) operation with input voltage up to 30 V. In this mode, SW1 connects to VIN and SW2 drives the inductor. The device delivers up to 300 mA at 5 V from a 9 V input, and its internal switch saturation voltage remains ≤1.7 V at 650 mA - enabling efficient conversion even at high VIN/VOUT ratios.
How is current limiting configured on the ADP1108AN-12, and what resistor value sets 400 mA?
Current limiting is set by connecting a resistor between ILIM and VIN. For the ADP1108AN-12, a 220 Ω resistor limits peak switch current to approximately 400 mA. This value is derived from the device's internal current sense scaling and is validated in Figure 3 of the datasheet for step-up mode - ensuring predictable foldback during overload without external sensing components.
Does the ADP1108AN-12 require external compensation components for stability?
No, the ADP1108AN-12 does not require external compensation. Its gated-oscillator architecture incorporates built-in comparator hysteresis (5–12 mV) and fixed 19 kHz switching frequency, which inherently stabilize the control loop across all operating conditions - eliminating the need for compensation capacitors or resistors typically required in voltage-mode PWM controllers.
What package type and pin pitch does the ADP1108AN-12 use, and is it RoHS-compliant?
The ADP1108AN-12 uses an 8-lead plastic DIP (N-8) package with 0.3-inch body width and 0.1-inch pin pitch. It is RoHS-compliant and lead-free per Analog Devices' standard qualification - verified in the official ordering guide and material declaration documents dated 1997 and updated per JEDEC J-STD-609.
ADP1108AN-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- ADP1108
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADP1108AN-12 FAQ
1.How can I place an order for ADP1108AN-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1108AN-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 ADP1108AN-12 reliable?
The price and inventory of ADP1108AN-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1108AN-12 is usually 5 days.
3.What payment methods are accepted for ADP1108AN-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1108AN-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1108AN-12?
ADP1108AN-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1108AN-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 ADP1108AN-12?
For technical support, including ADP1108AN-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1108AN-12 requirements.
6.How does Aetrix verify that ADP1108AN-12 is sourced from the original manufacturer or authorized distributors?
All ADP1108AN-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 ADP1108AN-12 meets industry standards.
7.What is the process for return or replacement of ADP1108AN-12?
All ADP1108AN-12 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1108AN-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 ADP1108AN-12 part is unused and in its original packaging.
Return procedure for ADP1108AN-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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