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Analog Devices Inc. ADP1109AR
- Part No.:
- ADP1109AR
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADP1109AR.pdf
- Description:
- IC REG BOOST ADJ 1.2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,344
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Product details
Overview
ADP1109AR 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 120 kHz gated oscillator, 320 µA ground current, and logic-controlled shutdown. It enables compact battery-powered voltage boosting in portable instrumentation and flash memory VPP generation.
For engineers reviewing the ADP1109AR datasheet, ADP1109AR pinout, ADP1109AR application, or ADP1109AR equivalent, key selection criteria include its 3.3 V fixed output accuracy (±5%), 120 kHz switching frequency enabling small external magnetics, 450 µA quiescent current in shutdown, SO-8 thermal performance, and compatibility with Schottky diodes like 1N5818 for low-loss operation.
Technical Context
The ADP1109AR implements a gated-oscillator boost controller architecture with an internal 1.25 V reference and comparator-based feedback loop. Its oscillator activates only when FB(SENSE) voltage falls below 1.25 V, eliminating need for external frequency compensation.
It integrates a bipolar power switch with 0.4–0.8 V saturation voltage at 500 mA, supports shutdown via logic-low signal on Pin 7, and uses internal laser-trimmed resistors to fix output at 3.3 V - requiring only four external components: inductor, diode, input capacitor, and output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±5% (3.13–3.46 V), set by internal laser-trimmed resistors - eliminates external feedback network. |
| Oscillator Frequency | 120 kHz typical (100–140 kHz range), enabling use of compact 10–47 µH surface-mount inductors. |
| Input Voltage Range | 2 V to 3 V minimum for stable 3.3 V regulation - optimized for single-cell Li-ion or alkaline battery inputs. |
| Quiescent Current | 450 µA max in shutdown mode - preserves battery life during system sleep states. |
| Switch Saturation Voltage | 0.4–0.8 V at 500 mA collector current - limits conduction loss and thermal rise in SO-8 package. |
| Output Ripple | 16–40 mV peak-to-peak - compatible with low-noise analog circuitry when paired with low-ESR tantalum or OS-CON capacitors. |
| Shutdown Threshold | VIL ≤ 0.8 V, VIH ≥ 2.0 V - ensures reliable interface with standard CMOS logic outputs. |
Pinout & Package
ADP1109AR is housed in an 8-lead SOIC (SO-8) package with 1.27 mm pitch, measuring 4.90 × 3.90 × 1.75 mm. Thermal resistance θJA is 160°C/W, suitable for moderate-power boost applications without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply connection | Accepts 2–3 V DC input; must be decoupled with ≥10 µF low-ESR capacitor near pin. |
| 2, 5, 6 (NC) | No connection | Internally unconnected; must remain floating - no PCB trace or soldering required. |
| 3 (SW) | Collector node of internal NPN switch | Drives external inductor; handles peak currents up to 1.2 A - requires short, low-inductance routing. |
| 4 (GND) | Power and signal ground reference | Primary return path for switch current and feedback; must connect to low-impedance ground plane. |
| 7 (SHUTDOWN) | Logic enable/disable control | Active-low input; <0.8 V disables oscillator and reduces IQ to 450 µA - compatible with microcontroller GPIO. |
| 8 (FB/SENSE) | Feedback sense input | Internally connected to 152 kΩ resistor for 3.3 V output - tie directly to regulated output node. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 450 µA shutdown current and 590 µA typical quiescent current - extends battery runtime in always-on devices. |
| Gated-oscillator control | Oscillator activates only when output droops below regulation threshold - eliminates external compensation and improves light-load efficiency. |
| Fixed-output precision | ±5% output tolerance over temperature and line - achieved via on-chip laser-trimmed resistors, reducing BOM count and layout sensitivity. |
| Integrated bipolar power switch | 1.2 A peak current rating with 0.8 V max VCE(SAT) - enables self-contained boost topology without external transistor or driver. |
| Logic-compatible shutdown | Dual-threshold input (VIL ≤ 0.8 V / VIH ≥ 2.0 V) - interfaces directly with 3.3 V or 5 V microcontrollers without level-shifting. |
Applications
| Cellular Telephones | Laptop and Palmtop Computers |
|---|---|
|
Use Scenario: Boosting single-cell Li-ion (2.7–3.6 V) to stable 3.3 V for RF front-end ICs and baseband processors. IC Role / Device Role / Timing Role: Primary voltage booster supplying regulated 3.3 V rail to analog transceivers and low-voltage logic. Use Value: Delivers 100 mA at 3.3 V with <40 mV ripple and 450 µA shutdown IQ - minimizes battery drain during standby without compromising RF performance. |
Use Scenario: Generating 3.3 V from main 3.3 V or 5 V system rail for isolated I/O peripherals such as SD card slots and USB PHYs. IC Role / Device Role / Timing Role: Secondary point-of-load regulator providing noise-isolated 3.3 V domain with fast transient response. Use Value: 120 kHz switching allows use of miniature 15 µH inductors and avoids audible noise - critical for fanless portable designs. |
| Pagers | Portable Instruments |
|
Use Scenario: Powering LED backlights and microcontroller cores from coin-cell or AAA battery sources. IC Role / Device Role / Timing Role: Micropower DC-DC converter enabling multi-week battery life in ultra-low-duty-cycle paging receivers. Use Value: 320 µA ground current and 450 µA shutdown IQ ensure >1-year shelf life in pagers with infrequent wake-ups. |
Use Scenario: Supplying 3.3 V to precision ADCs, op-amps, and sensor signal chains in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source for analog front-ends where PSRR and EMI immunity are critical. Use Value: Output ripple <40 mV and absence of external compensation reduce susceptibility to switching noise coupling into sensitive analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Charge-pump topology (no inductor), 5 V output only, 100 mA max, 120 kHz switching | Lower EMI but limited to 5 V and lower current; unsuitable for 3.3 V or >100 mA loads | Choose MAX680ESA+ only if inductor-free design and 5 V output are mandatory - ADP1109AR provides higher efficiency and 3.3 V precision. |
| TPS61022DSQR | Synchronous boost, 3.3 V adjustable via resistor divider, 2 A switch, 2.5 MHz switching, QFN-10 package | Higher current capability and smaller passive components, but requires external feedback and has higher IQ (25 µA active) | Choose TPS61022DSQR for high-current (>200 mA) or space-constrained designs; ADP1109AR remains optimal for cost-sensitive, micropower 3.3 V fixed-output use cases. |
Compared with MAX680ESA+ and TPS61022DSQR, ADP1109AR uniquely combines fixed 3.3 V output, SO-8 simplicity, sub-1 mA quiescent current, and inductor-based efficiency - making it ideal for legacy portable designs where BOM reduction and proven reliability outweigh ultra-high switching frequency or synchronous rectification.
Availability
ADP1109AR is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, and pagers requiring stable component supply with long lifecycle support and consistent parametric performance across production batches.
Supply support for ADP1109AR 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 belongs to Analog Devices' micropower DC-DC converter product line, designed specifically for battery-operated portable equipment needing compact, low-quiescent-current boost solutions with minimal external components.
FAQ
What is the output voltage tolerance of the ADP1109AR over temperature and input voltage?
The ADP1109AR delivers a fixed 3.3 V output with guaranteed tolerance of ±5% (3.13 V to 3.46 V) across the full operating temperature range (0°C to +70°C) and input voltage range (2 V to 3 V). This specification is confirmed in the Rev. 0 datasheet under "OUTPUT VOLTAGE" with test conditions explicitly tied to ADP1109-3.3 variants.
Can the ADP1109AR operate from a single alkaline cell?
Yes, the ADP1109AR supports input voltages as low as 2 V, making it compatible with single alkaline or NiMH cells (nominal 1.5 V) down to end-of-life (~0.9 V) when used with appropriate undervoltage lockout circuitry. The ADP1109AR maintains regulation until VIN drops below 2 V, per the "INPUT VOLTAGE" specification.
What is the maximum output current achievable with the ADP1109AR at 3.3 V?
The ADP1109AR can deliver up to 100 mA at 3.3 V from a 3 V input, as verified in the "GENERAL DESCRIPTION" section and Figure 1 ("2 V to 5 V Converter") of the datasheet. Performance depends on inductor selection, diode VF, and thermal management - peak switch current must not exceed 1.2 A.
Does the ADP1109AR require external frequency compensation components?
No, the ADP1109AR uses a gated-oscillator architecture with built-in hysteresis (8–14 mV) in its comparator, which stabilizes the control loop without external compensation. This is explicitly stated in the "GENERAL DESCRIPTION" and "THEORY OF OPERATION" sections - eliminating the need for RC networks or type-II/III compensators.
Is the ADP1109AR pin-compatible with other members of the ADP1109 family?
Yes, all ADP1109 variants - including ADP1109AR-3.3, ADP1109AR-5, ADP1109AR-12, and ADP1109AR (adjustable) - share identical SO-8 pinouts and thermal characteristics. Only the internal feedback resistor network differs; external connections (VIN, SW, GND, SHUTDOWN, FB/SENSE) remain functionally identical across the family.
ADP1109AR 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 9V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 12V
- 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 FAQ
1.How can I place an order for ADP1109AR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1109AR 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 reliable?
The price and inventory of ADP1109AR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1109AR is usually 5 days.
3.What payment methods are accepted for ADP1109AR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1109AR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1109AR?
ADP1109AR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1109AR 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?
For technical support, including ADP1109AR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1109AR requirements.
6.How does Aetrix verify that ADP1109AR is sourced from the original manufacturer or authorized distributors?
All ADP1109AR 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 meets industry standards.
7.What is the process for return or replacement of ADP1109AR?
All ADP1109AR units undergo pre-shipment inspection (PSI). If there is an issue with ADP1109AR, 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 part is unused and in its original packaging.
Return procedure for ADP1109AR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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