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Analog Devices Inc. ADP1108AN-3.3
- Part No.:
- ADP1108AN-3.3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADP1108AN-3.3.pdf
- Description:
- IC REG BUCK BOOST 3.3V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,756
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Product details
Overview
ADP1108AN-3.3 from Analog Devices is a micropower step-up/step-down DC-DC converter IC with fixed 3.3 V output, internal 1 A power switch, programmable current limit, and on-chip low-battery detector. It operates from 2.0 V to 30 V input, delivers up to 300 mA in step-down mode, and consumes only 90 µA quiescent current-ideal for battery-powered portable instruments and LCD bias generation.
For engineers reviewing the ADP1108AN-3.3 datasheet, ADP1108AN-3.3 pinout, ADP1108AN-3.3 application, or ADP1108AN-3.3 equivalent, key selection considerations include its dual-mode topology support, 3.3 V ±4.5% output tolerance at full load, 19 kHz oscillator frequency, ILIM-programmable switch current, and compatibility with DIP-8 PCB layouts for legacy industrial designs.
Technical Context
The ADP1108AN-3.3 implements a gated-oscillator control architecture with an internal 1.245 V reference and comparator-based regulation loop. Its dual-access power switch (SW1 collector, SW2 emitter) enables both boost and buck topologies using external inductor/diode networks without additional driver circuitry.
It integrates an auxiliary gain block (SET/AO pins) configurable as a low-battery detector or error amplifier, and supports current limiting via resistor between ILIM and VIN-enabling precise peak switch current control from 400 mA to 1.5 A depending on resistor value and operating mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V, guaranteed 3.13–3.46 V across temperature and load per spec |
| Input Voltage Range | 2.0 V to 12.6 V (step-up), up to 30 V (step-down)-supports single-cell Li-ion to multi-cell alkaline inputs |
| Quiescent Current | 90 µA typical at no load-enables >1-year battery life in always-on sensor nodes |
| Oscillator Frequency | 14–25 kHz typical 19 kHz-low-frequency switching reduces EMI and enables use of low-cost ferrite inductors |
| Switch Current Limit | Programmable via ILIM-to-VIN resistor; default 500 mA with no external resistor |
| Output Hysteresis | 13–30 mV-ensures stable regulation without external compensation components |
| Operating Temperature | 0°C to +70°C-qualified for commercial-grade embedded systems and portable electronics |
Pinout & Package
ADP1108AN-3.3 is housed in an 8-pin plastic DIP (N-8) package with through-hole mounting and 0.3-inch width, compatible with legacy prototyping and industrial control PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM | Current limit programming input | Connect to VIN directly for default 500 mA limit; add resistor to reduce peak switch current for thermal or efficiency optimization |
| VIN | Main power supply input | Accepts 2.0–30 V; powers internal circuitry and supplies base drive for internal NPN switch |
| SW1 | Power switch collector | In step-up: connects to inductor; in step-down: ties to VIN-defines high-side switching node |
| SW2 | Power switch emitter | In step-up: connects to GND; in step-down: drives inductor-defines low-side switching node |
| FB/SENSE | Feedback input (fixed-voltage mode) | Internally connected to laser-trimmed resistor divider; connect directly to output for regulation |
| SET | Auxiliary amplifier non-inverting input | Accepts voltage divider from VIN to configure low-battery detection threshold relative to 1.245 V reference |
| AO | Auxiliary gain block open-collector output | Sinks 100 µA; used for battery alarm signaling or linear post-regulation control |
| GND | Analog and power ground reference | Single ground plane required; must be low-impedance return path for switch current and feedback network |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode topology support | Single IC configures as boost (VIN < VOUT) or buck (VIN > VOUT) with no external controller changes |
| Integrated 1 A NPN power switch | Eliminates need for external transistor and driver; reduces BOM count and layout area in space-constrained designs |
| On-chip low-battery detector | Uses SET/AO pins to generate logic-level alert when input drops below user-defined threshold-no extra comparator IC needed |
| Fixed 3.3 V output with laser-trimmed resistors | Guarantees ±4.5% output accuracy over temperature without external feedback components |
| 8-pin DIP package | Enables hand-soldering, socket-based testing, and drop-in replacement in legacy industrial power supplies |
Applications
| Portable Instrument Power Supply | LCD Bias Generation |
|---|---|
Use Scenario: Handheld multimeter powered by two AA cells requiring stable 3.3 V rail for microcontroller and ADC. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 2.0–3.2 V battery range to regulated 3.3 V output in step-up mode. Use Value: 90 µA quiescent current extends battery life beyond 18 months; fixed-output eliminates feedback resistor placement errors. |
Use Scenario: Monochrome LCD display in medical diagnostic device needing positive and negative bias rails. IC Role / Device Role / Timing Role: Step-up converter generating +3.3 V from main system rail; paired with inverting configuration for -3.3 V. Use Value: Dual-mode capability allows reuse of same IC for both polarities; 19 kHz switching avoids audible noise in clinical environments. |
| Peripheral Card Voltage Translation | Battery Backup Supply |
Use Scenario: ISA bus add-on card converting 5 V system rail to 3.3 V logic level for FPGA interface. IC Role / Device Role / Timing Role: Step-down regulator operating from 5 V input to deliver 300 mA at 3.3 V with minimal heat dissipation. Use Value: Internal 1 A switch handles peak loads without derating; DIP-8 footprint simplifies retrofit into existing card-edge connectors. |
Use Scenario: Real-time clock module with coin-cell backup requiring ultra-low-quiescent 3.3 V supply during main power loss. IC Role / Device Role / Timing Role: Always-on micropower regulator maintaining RTC voltage from CR2032 cell during AC failure. Use Value: 90 µA IQ ensures >5-year backup runtime; built-in low-battery detector triggers switchover before voltage collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX630CPA+ | Fixed 3.3 V output, 100 µA IQ, 100 kHz switching, SO-8 only-no DIP option or ILIM programming | Lacks step-down capability and auxiliary gain block; unsuitable for low-battery detection or wide-input-range designs | Select if higher switching frequency and smaller inductors are prioritized over topology flexibility and legacy package support |
| TPS61022DRVR | Adjustable 0.9–5.5 V output, 20 µA IQ, 1.2 MHz switching, 2 A switch-QFN-11 package only | No fixed 3.3 V variant; requires external feedback resistors and lacks AO/SET functionality for monitoring | Choose for ultra-low IQ and high-efficiency USB-powered applications where board space permits QFN rework |
Compared with MAX630CPA+ and TPS61022DRVR, the ADP1108AN-3.3 uniquely combines DIP-8 legacy compatibility, dual-mode topology, integrated low-battery detection, and programmable current limiting-making it optimal for cost-sensitive, field-serviceable, and battery-life-critical industrial instruments.
Availability
ADP1108AN-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, LCD bias generation, peripheral card voltage translation, and battery backup supplies requiring stable component supply with long-term industrial availability.
Supply support for ADP1108AN-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.
The ADP1108 product line was designed for ultra-low-power, topology-flexible DC-DC conversion in battery-operated and space-constrained embedded systems-emphasizing micropower operation, minimal external components, and robust protection features.
FAQ
What is the maximum output current capability of the ADP1108AN-3.3 in step-down mode?
The ADP1108AN-3.3 delivers up to 300 mA at 3.3 V from a 9 V input in step-down mode, as specified in the General Description. This assumes proper inductor selection (e.g., 150 µH, 1 A saturation rating) and thermal management. At lower input voltages such as 5 V, output current is limited by switch duty cycle and internal power dissipation-consult Figure 4 in the datasheet for RLIM-dependent current limits.
Can the ADP1108AN-3.3 be used in step-up mode with a 2.0 V input to generate 3.3 V?
Yes, the ADP1108AN-3.3 supports step-up operation from as low as 2.0 V input to 3.3 V output. The datasheet confirms startup from 1.8 V and operation down to 2.0 V in boost mode. Achieving stable regulation requires a properly sized inductor (e.g., 100–220 µH) and Schottky diode (e.g., 1N5818), with attention to minimum switch on-time and output capacitor ESR.
Does the ADP1108AN-3.3 require external feedback resistors for regulation?
No, the ADP1108AN-3.3 does not require external feedback resistors. As a fixed-output variant, it incorporates laser-trimmed internal resistors connecting the FB/SENSE pin to the 1.245 V reference. Users simply connect the FB pin directly to the output node-eliminating resistor tolerance errors and layout sensitivity inherent in adjustable versions like the ADP1108AN.
How is the current limit set on the ADP1108AN-3.3, and what is the default value?
The ADP1108AN-3.3 current limit is set by connecting a resistor between the ILIM pin and VIN. With ILIM tied directly to VIN, the default switch current limit is 500 mA at +25°C. To reduce peak current-for example, to 400 mA-connect a 220 Ω resistor between ILIM and VIN, as documented in the Pin Function Descriptions section.
Is the ADP1108AN-3.3 RoHS compliant and lead-free?
Yes, the ADP1108AN-3.3 is RoHS compliant and lead-free. Analog Devices confirms Pb-free packaging for all ADP1108 variants manufactured after 2006, including the AN (plastic DIP) package. The device carries the "Pb-Free" marking on the package body and meets JEDEC J-STD-020 moisture sensitivity level 3 requirements.
ADP1108AN-3.3 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):
- 3.3V
- 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-3.3 FAQ
1.How can I place an order for ADP1108AN-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1108AN-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 ADP1108AN-3.3 reliable?
The price and inventory of ADP1108AN-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 ADP1108AN-3.3 is usually 5 days.
3.What payment methods are accepted for ADP1108AN-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1108AN-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1108AN-3.3?
ADP1108AN-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1108AN-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 ADP1108AN-3.3?
For technical support, including ADP1108AN-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1108AN-3.3 requirements.
6.How does Aetrix verify that ADP1108AN-3.3 is sourced from the original manufacturer or authorized distributors?
All ADP1108AN-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 ADP1108AN-3.3 meets industry standards.
7.What is the process for return or replacement of ADP1108AN-3.3?
All ADP1108AN-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1108AN-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 ADP1108AN-3.3 part is unused and in its original packaging.
Return procedure for ADP1108AN-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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