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Analog Devices Inc. ADP1108AR-3.3
- Part No.:
- ADP1108AR-3.3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1108AR-3.3.pdf
- Description:
- IC REG BUCK BOOST 3.3V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,263
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Product details
Overview
ADP1108AR-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, 19 kHz oscillator, and programmable current limit. 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 low-power peripherals.
For engineers reviewing the ADP1108AR-3.3 datasheet, ADP1108AR-3.3 pinout, ADP1108AR-3.3 application, or ADP1108AR-3.3 equivalent, key selection considerations include its dual-mode topology support, on-chip low-battery detector (via AO/SET), 3.3 V ±4.5% output tolerance at full load, SO-8 package compatibility, and absence of external feedback resistors required for fixed-output operation.
Technical Context
The ADP1108AR-3.3 implements a gated-oscillator control architecture with internal 1.245 V reference and comparator-based regulation. Its dual-collector/emitter switch configuration enables both boost and buck topologies without external transistor additions.
It integrates an auxiliary gain block (SET/AO pins) usable as open-collector low-battery detector or error amplifier, and supports user-defined current limiting via ILIM-to-VIN resistor-enabling precise peak switch current control across input voltage ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V, ±4.5% tolerance (3.13–3.46 V) ensures stable logic rail generation for 3.3 V microcontrollers and peripherals. |
| Input Voltage Range | 2.0 V to 30 V supports wide-source applications: single-cell Li-ion (2.7–4.2 V), dual-AA (2.0–3.2 V), or industrial 9–24 V supplies. |
| Quiescent Current | 90 µA (typ) enables >1-year battery life in always-on sensor nodes powered by 2xAA cells. |
| Oscillator Frequency | 19 kHz (typ) balances EMI suppression and inductor size-compatible with standard 47–330 µH off-the-shelf ferrite inductors. |
| Switch Current Limit | Programmable up to 500 mA via ILIM resistor; default (ILIM = VIN) supports 1 A peak, enabling 300 mA continuous 3.3 V output from 9 V input. |
| Package | SO-8 surface-mount package with 1.27 mm pitch allows high-density PCB layout and reflow compatibility. |
| Operating Temperature | 0°C to +70°C rating suits commercial portable electronics, including handheld test equipment and add-on cards. |
Pinout & Package
ADP1108AR-3.3 is housed in an 8-pin SOIC (SO-8) package with standard 1.27 mm lead pitch and exposed pad not present. Pin functions are electrically validated per Analog Devices ADP1108 Rev. 0 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Current limit programming input | Connect to VIN for full 1 A switch capability; add resistor to VIN to reduce peak current (e.g., 220 Ω → 500 mA). |
| 2 VIN | Main power input | Accepts 2.0–30 V; supplies internal circuitry and switch driver; must be bypassed with ≥1 µF ceramic capacitor. |
| 3 SW1 | Power switch collector | In boost mode: connects to inductor/diode node; in buck mode: ties directly to VIN. |
| 4 SW2 | Power switch emitter | In boost mode: connects to GND; in buck mode: drives inductor-must not fall below –350 mV. |
| 5 FB/SENSE | Feedback input (fixed version) | Internally connected to laser-trimmed resistor divider; connect directly to 3.3 V output-no external resistors needed. |
| 6 SET | Auxiliary amplifier non-inverting input | Accepts resistor divider from VIN to GND for low-battery detection threshold setting (e.g., 3.0 V trip). |
| 7 AO | Auxiliary gain block output | Open-collector NPN output sinking 100 µA; pulls low when SET voltage exceeds 1.245 V reference. |
| 8 GND | Analog and power ground | Single ground reference for all internal blocks; requires low-impedance PCB connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode topology support | Enables both step-up (2.0–12.6 V input → 3.3 V) and step-down (up to 30 V input → 3.3 V) without external MOSFETs or topology-specific ICs. |
| Integrated low-battery detector | SET/AO pins form configurable comparator with 1.245 V internal reference-eliminates need for discrete supervisor IC in portable designs. |
| Fixed-output simplification | Laser-trimmed on-die resistors remove external feedback network, reducing BOM count and layout area versus adjustable versions. |
| Programmable current limit | Single resistor between ILIM and VIN sets peak switch current-enables optimization for efficiency vs. inductor saturation in varying input conditions. |
| Micropower operation | 90 µA quiescent current extends battery runtime in always-on monitoring systems where sleep-mode current dominates total consumption. |
Applications
| Portable Instrument Power | Low-Voltage Peripheral Regulation |
|---|---|
Use Scenario: Handheld multimeter powered by two alkaline AA cells (1.8–3.2 V) requiring stable 3.3 V for MCU and ADC. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing regulated 3.3 V rail; operates in step-up mode during battery discharge. Use Value: Delivers 150 mA at 3.3 V from 2.0 V input with <90 µA quiescent draw-enabling >500-hour operation on fresh batteries. | Use Scenario: USB-powered add-on card with 5 V bus input needing isolated 3.3 V logic supply for FPGA I/O banks. IC Role / Device Role / Timing Role: Step-down converter generating clean 3.3 V from noisy 5 V USB source; uses internal switch for compact design. Use Value: Achieves 300 mA output with 19 kHz switching-minimizing EMI near high-speed digital interfaces while avoiding external FET layout complexity. |
| Battery Backup Supply | 3.3 V LCD Bias Generation |
Use Scenario: Real-time clock module with coin-cell backup (2.0–3.0 V) requiring uninterrupted 3.3 V during main power loss. IC Role / Device Role / Timing Role: Always-on micropower regulator maintaining RTC voltage during AC failure; leverages ultra-low IQ for extended hold-up time. Use Value: 90 µA supply current enables >3-month backup from CR2032 cell-exceeding typical RTC retention requirements. | Use Scenario: Monochrome LCD display in palm-top computer using 3 V primary supply but requiring boosted 3.3 V for contrast control and segment drivers. IC Role / Device Role / Timing Role: Compact step-up converter generating precise 3.3 V bias from marginal 3 V rail; utilizes internal 1 A switch for transient load handling. Use Value: Fixed 3.3 V output eliminates feedback resistor drift errors-ensuring consistent display contrast across temperature and battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61022RGET | Higher 2.5 MHz switching frequency; 0.5 A output; requires external feedback resistors for 3.3 V setting. | Optimized for space-constrained designs needing smaller inductors/capacitors; lacks integrated low-battery detector. | Select when board area is critical and higher-frequency EMI filtering is acceptable; verify AO/SET functionality replacement if used for battery monitoring. |
| MAX17222ETA+ | 1.2 MHz operation; 0.5 A output; 2.5 µA quiescent current; fixed 3.3 V option available (MAX17222ETA33+). | Better suited for ultra-low-power IoT sensors; no auxiliary gain block or ILIM programming. | Prefer for energy-harvesting or multi-year battery applications; avoid if AO-based low-battery signaling or adjustable current limiting is required. |
Compared with TPS61022RGET and MAX17222ETA+, ADP1108AR-3.3 provides unique integration of programmable current limit, on-chip low-battery detection, and dual-mode topology-all in SO-8-making it optimal for cost-sensitive portable instrumentation where feature consolidation reduces component count and validation effort.
Availability
ADP1108AR-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, battery-backed real-time clocks, and low-voltage peripheral regulation requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for ADP1108AR-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and power management.
The ADP1108 product line delivers highly integrated, micropower DC-DC conversion solutions targeting battery-operated portable electronics, where minimal quiescent current, topology flexibility, and system-level feature integration (e.g., low-battery detection) are critical design requirements.
FAQ
What is the output voltage tolerance of the ADP1108AR-3.3 under full load?
The ADP1108AR-3.3 delivers a fixed 3.3 V output with guaranteed tolerance of ±4.5% (3.13 V to 3.46 V) across input voltage (2.0–30 V), temperature (0°C to +70°C), and load (0–300 mA). This specification is laser-trimmed at wafer level and does not require external feedback components-ensuring consistent performance in production units of ADP1108AR-3.3.
Can the ADP1108AR-3.3 operate in step-down mode from a 12 V input to 3.3 V output?
Yes, the ADP1108AR-3.3 supports step-down (buck) operation from inputs up to 30 V. When configured for buck mode-with SW1 tied to VIN and SW2 driving the inductor-it delivers 300 mA at 3.3 V from a 12 V source. The internal switch exhibits 1.1–1.5 V saturation voltage at 650 mA in this mode, confirmed in the ADP1108 datasheet Figure 11.
How is current limiting implemented on the ADP1108AR-3.3?
Current limiting on the ADP1108AR-3.3 is set by connecting a resistor between ILIM and VIN. With ILIM tied directly to VIN, the device supports up to 1 A peak switch current. Adding a 220 Ω resistor reduces maximum switch current to 500 mA-verified in the "CURRENT LIMIT" specification table and Figure 4 of the ADP1108 datasheet.
Does the ADP1108AR-3.3 require external feedback resistors to set its 3.3 V output?
No, the ADP1108AR-3.3 does not require external feedback resistors. Its 3.3 V output is established by on-die laser-trimmed resistors connected internally to the FB/SENSE pin-confirmed in the PIN FUNCTION DESCRIPTIONS section and ORDERING GUIDE of the ADP1108 datasheet. Simply connect FB directly to the output for regulation.
What is the function of the AO and SET pins on the ADP1108AR-3.3?
The AO (auxiliary output) and SET pins on the ADP1108AR-3.3 form an uncommitted gain block with internal 1.245 V reference. SET serves as the non-inverting input; AO is an open-collector NPN output sinking 100 µA. Together, they enable low-battery detection, UVLO, or linear post-regulation-without additional ICs-as documented in the THEORY OF OPERATION section.
ADP1108AR-3.3 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):
- 3.3V
- 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-3.3 FAQ
1.How can I place an order for ADP1108AR-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1108AR-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 ADP1108AR-3.3 reliable?
The price and inventory of ADP1108AR-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 ADP1108AR-3.3 is usually 5 days.
3.What payment methods are accepted for ADP1108AR-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1108AR-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1108AR-3.3?
ADP1108AR-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1108AR-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 ADP1108AR-3.3?
For technical support, including ADP1108AR-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1108AR-3.3 requirements.
6.How does Aetrix verify that ADP1108AR-3.3 is sourced from the original manufacturer or authorized distributors?
All ADP1108AR-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 ADP1108AR-3.3 meets industry standards.
7.What is the process for return or replacement of ADP1108AR-3.3?
All ADP1108AR-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1108AR-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 ADP1108AR-3.3 part is unused and in its original packaging.
Return procedure for ADP1108AR-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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