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Analog Devices Inc. ADP1109AR-3.3
- Part No.:
- ADP1109AR-3.3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1109AR-3.3.pdf
- Description:
- IC REG BOOST 3.3V 1.2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,279
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Product details
Overview
ADP1109AR-3.3 from Analog Devices is a micropower step-up DC-to-DC converter in SO-8 package, delivering fixed 3.3 V output from 2 V–3 V input with typical output voltage of 3.30 V, 120 kHz oscillator frequency, and 450 µA quiescent current in shutdown mode. It integrates an internal NPN power switch and comparator with 1.25 V reference for battery-powered portable instrumentation and low-voltage logic supply generation.
For engineers reviewing the ADP1109AR-3.3 datasheet, ADP1109AR-3.3 pinout, ADP1109AR-3.3 application, or ADP1109AR-3.3 equivalent, key selection criteria include input voltage range (2 V–3 V), output ripple (16–40 mV), switch saturation voltage (0.4–0.8 V at VIN = 3 V), shutdown logic compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and SO-8 thermal and layout constraints.
Technical Context
The ADP1109AR-3.3 implements a gated-oscillator boost topology with internal 1.25 V reference and comparator hysteresis (8–14 mV) to ensure loop stability without external compensation. Its oscillator operates at 120 kHz (±20 kHz) and enables use of small surface-mount inductors (e.g., 15 µH–33 µH) and capacitors.
It features a single integrated NPN power switch rated for 1.2 A peak current and 0.4–0.8 V saturation voltage, with logic-controlled shutdown that reduces quiescent current to 450 µA. The FB/SENSE pin is internally connected to laser-trimmed resistors for fixed 3.3 V output, eliminating external feedback components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.30 V typical (3.13–3.46 V over 2 V–3 V input); enables direct powering of 3.3 V logic rails from single-cell Li-ion or alkaline sources. |
| Oscillator Frequency | 120 kHz typical (90–155 kHz over temp/voltage); balances efficiency and EMI while allowing compact 15–33 µH inductor selection. |
| Quiescent Current | 450 µA max in shutdown; supports ultra-low-power standby modes in portable devices with extended battery life. |
| Switch Saturation Voltage | 0.4–0.8 V at 500 mA and VIN = 3 V; limits conduction loss and thermal rise in high-duty-cycle operation. |
| Input Voltage Range | 2 V to 3 V (for 3.3 V output); matches nominal voltage of single Li-ion (3.0–3.7 V) or two NiMH cells (2.4–3.0 V). |
| Output Ripple | 16–40 mV p-p; meets noise requirements for analog sensors and low-noise microcontrollers without additional LDO post-regulation. |
| Shutdown Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V; ensures reliable interface with 3.3 V CMOS logic without level-shifting. |
Pinout & Package
ADP1109AR-3.3 is housed in an 8-lead SOIC (SO-8) package with 1.27 mm pitch, 4.9 × 6.0 mm body size, and standard JEDEC MS-012AC footprint. Thermal resistance θJA is 160°C/W (typical), requiring minimal copper area for thermal management in handheld applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Accepts 2 V–3 V unregulated source; must be decoupled with ≥10 µF low-ESR capacitor near pin. |
| NC (Pins 2, 5, 6) | No connection | Internally unconnected; must remain floating-no routing or soldering required. |
| SW (Pin 3) | Collector of internal NPN switch | Drives external inductor; carries pulsed current up to 1.2 A; requires short, low-inductance trace to minimize switching noise. |
| GND (Pin 4) | Power and signal ground reference | Primary return path for switch current and feedback; must connect to low-impedance ground plane under IC. |
| FB/SENSE (Pin 8) | Feedback node for output regulation | Internally tied to laser-trimmed resistor divider for 3.3 V setpoint; connect directly to regulated output node. |
| SHUTDOWN (Pin 7) | Logic enable/disable control | Active-low; drives oscillator on logic high (>2.0 V), disables it on logic low (<0.8 V); pulls <20 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output with internal resistor trim | Eliminates external feedback network-reduces BOM count and layout area by 2 resistors vs. adjustable version. |
| Gated-oscillator architecture | Enables stable regulation without external frequency compensation components, simplifying design validation. |
| Logic-compatible shutdown | Direct interface with 3.3 V microcontroller GPIO pins; no external pull-up or level shifter needed. |
| Low 450 µA shutdown current | Extends battery runtime in sleep modes-critical for handheld inventory scanners and portable medical sensors. |
| 120 kHz switching frequency | Supports use of low-cost, small-footprint 15–33 µH surface-mount inductors with <0.4 Ω DCR. |
Applications
| Hand-Held Inventory Computers | Laser Diode Drivers |
|---|---|
Use Scenario: Battery-powered barcode scanners operating from single-cell Li-ion (3.0–3.7 V) with intermittent high-current decode bursts. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3 V rail for microcontroller, display, and imaging sensor subsystems. Use Value: Delivers 3.3 V at up to 100 mA with <40 mV ripple, enabling clean digital operation during RF transmission and image capture without brownout. | Use Scenario: Compact laser pointer modules requiring precise 3.3 V bias for driver ICs and photodiode monitoring circuits. IC Role / Device Role / Timing Role: Primary 3.3 V power source for laser diode bias control and analog front-end amplification. Use Value: Low 450 µA shutdown current extends idle time between laser activations; 120 kHz switching avoids audible noise in consumer-grade pointers. |
| Portable Instruments | Battery Backup Supplies |
Use Scenario: Handheld multimeters and environmental sensors powered by two AA alkaline cells (2.4–3.0 V) with LCD and ADC subsystems. IC Role / Device Role / Timing Role: Main 3.3 V supply for precision ADC reference, microcontroller core, and serial interface transceivers. Use Value: Maintains regulation down to 2 V input, supporting full instrument functionality until battery depletion; 3.30 V ±3% accuracy ensures ADC linearity. | Use Scenario: SRAM backup circuits in industrial controllers where main 5 V rail may fail and supercapacitor holds 2.5–3.0 V for >10 s. IC Role / Device Role / Timing Role: Boost converter restoring 3.3 V to volatile memory and real-time clock during brownout events. Use Value: Operates from as low as 2 V input, enabling reliable data retention even as backup capacitor discharges below 2.5 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-to-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Charge-pump topology (no inductor), 5 V output only, 100 kHz, 100 µA quiescent current | Lower output current (100 mA), no magnetic components, but cannot generate 3.3 V directly | Select when inductor-free design and lower IQ are prioritized over output voltage flexibility. |
| TPS61022DSQR | Synchronous boost, 3.3 V fixed, 2.5 V–5.5 V input, 2 MHz switching, 25 µA quiescent current | Higher efficiency (>90%), smaller passive components, but requires external feedback for 3.3 V configuration | Select for higher efficiency and smaller solution size in new designs where PCB space is constrained. |
Compared with MAX680ESA+ and TPS61022DSQR, the ADP1109AR-3.3 offers proven reliability in legacy portable systems, simpler magnetics design due to 120 kHz frequency, and guaranteed 3.3 V output without external resistors-making it optimal for cost-sensitive, volume-manufactured handheld instruments.
Availability
ADP1109AR-3.3 is available at Aetrix Electronics and suitable for handheld inventory computers, portable instruments, battery backup supplies, and laser diode drivers requiring stable component supply across long production lifecycles.
Supply support for ADP1109AR-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 industrial, automotive, communications, and healthcare markets since 1965.
The ADP1109AR-3.3 belongs to Analog Devices' micropower DC-to-DC converter product line, designed specifically for battery-operated portable electronics requiring low quiescent current, minimal external components, and fixed-output simplicity.
FAQ
What is the minimum input voltage required for stable 3.3 V output from the ADP1109AR-3.3?
The ADP1109AR-3.3 maintains regulated 3.3 V output down to 2 V input, as specified in the datasheet under "OUTPUT VOLTAGE" conditions for ADP1109-3.3 (2 V ≤ VIN ≤ 3 V). Below 2 V, regulation is not guaranteed, and output drops proportionally. This 2 V minimum enables operation from nearly depleted alkaline or NiMH cells, extending usable battery life in portable instruments.
Does the ADP1109AR-3.3 require external feedback resistors to set its 3.3 V output?
No, the ADP1109AR-3.3 does not require external feedback resistors. Its 3.3 V output is set by internal laser-trimmed resistors connected to the FB/SENSE pin (Pin 8), as confirmed in the "ORDERING GUIDE" and "PIN FUNCTION DESCRIPTIONS" sections. Users simply connect Pin 8 directly to the output node-no external R1/R2 network is needed, reducing component count and layout complexity.
What is the maximum load current the ADP1109AR-3.3 can deliver at 3.3 V output?
The ADP1109AR-3.3 is characterized to deliver up to 100 mA at 3.3 V from a 3 V input, based on the general performance statement: "The ADP1109-5 can deliver 100 mA at 5 V from a 3 V input" and consistent scaling for the -3.3 variant. Output current capability decreases at lower input voltages (e.g., ~50 mA at 2 V input), and thermal limits apply-continuous operation above 80 mA requires adequate PCB copper area for heat dissipation.
Can the ADP1109AR-3.3 be used with ceramic output capacitors?
Yes, the ADP1109AR-3.3 supports ceramic output capacitors, provided they meet minimum capacitance (≥10 µF) and low-ESR requirements. The datasheet recommends low-ESR aluminum, tantalum, or OS-CON types-but ceramic capacitors with X5R/X7R dielectrics and ESR <50 mΩ are also suitable if sufficient capacitance is used to limit output ripple to ≤40 mV. Avoid NP0/C0G ceramics alone due to insufficient bulk capacitance.
Is the ADP1109AR-3.3 pin-compatible with other variants in the ADP1109 family?
Yes, the ADP1109AR-3.3 shares identical SO-8 pinout and terminal functions with ADP1109AR-5, ADP1109AR-12, and ADP1109AR (adjustable), as confirmed in the "PIN CONFIGURATIONS" diagram and "PIN FUNCTION DESCRIPTIONS" table. All variants use Pins 1 (VIN), 3 (SW), 4 (GND), 7 (SHUTDOWN), and 8 (FB/SENSE) identically; only the internal feedback network differs-enabling drop-in replacement for voltage-scaling upgrades without PCB changes.
ADP1109AR-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 9V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.2A (Switch)
- Frequency - Switching:
- 120kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADP1109AR-3.3 FAQ
1.How can I place an order for ADP1109AR-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1109AR-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 ADP1109AR-3.3 reliable?
The price and inventory of ADP1109AR-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 ADP1109AR-3.3 is usually 5 days.
3.What payment methods are accepted for ADP1109AR-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1109AR-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1109AR-3.3?
ADP1109AR-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1109AR-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 ADP1109AR-3.3?
For technical support, including ADP1109AR-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1109AR-3.3 requirements.
6.How does Aetrix verify that ADP1109AR-3.3 is sourced from the original manufacturer or authorized distributors?
All ADP1109AR-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 ADP1109AR-3.3 meets industry standards.
7.What is the process for return or replacement of ADP1109AR-3.3?
All ADP1109AR-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with ADP1109AR-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 ADP1109AR-3.3 part is unused and in its original packaging.
Return procedure for ADP1109AR-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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