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Analog Devices Inc. ADP1109AN
- Part No.:
- ADP1109AN
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADP1109AN.pdf
- Description:
- IC REG BOOST ADJ 1.2A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,518
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Product details
Overview
ADP1109AN from Analog Devices is a micropower step-up DC-to-DC converter in 8-lead plastic DIP (N-8) package, delivering fixed 3.3 V output from 2 V–3 V input, with 120 kHz oscillator frequency, 320 µA ground current, and logic-controlled shutdown. It serves as a compact, low-component-count boost regulator for battery-powered portable instrumentation requiring stable low-voltage rail generation.
For engineers reviewing the ADP1109AN datasheet, ADP1109AN pinout, ADP1109AN application, or ADP1109AN equivalent, key selection criteria include its fixed 3.3 V output accuracy (±5%), 120 kHz switching frequency enabling small external magnetics, shutdown pin interface (VIH = 2.0 V, VIL = 0.8 V), and compatibility with Schottky diodes like 1N5818 for efficient low-current conversion.
Technical Context
The ADP1109AN implements a gated-oscillator architecture with internal 1.25 V reference and comparator hysteresis (8–14 mV), eliminating need for external frequency compensation. Its internal NPN power switch operates with typical saturation voltage of 0.4–0.8 V at 500 mA and supports duty cycle range of 40–70% under full load.
Feedback is implemented via internal laser-trimmed resistor network tied to Pin 8 (FB/SENSE), setting output precisely to 3.3 V - no external resistors required. Shutdown control is TTL-compatible: logic low on Pin 7 disables oscillator, reducing quiescent current to 450–590 µA while maintaining regulated output hold-up during inactive periods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±5% (3.13–3.46 V) over 2 V–3 V input range - enables direct replacement of LDOs in low-noise 3.3 V logic rails. |
| Oscillator Frequency | 120 kHz typical (90–155 kHz over temp/voltage) - allows use of low-cost, small-footprint 10–47 µH surface-mount inductors. |
| Quiescent Current | 450–590 µA in shutdown - preserves battery life in intermittently active portable devices. |
| Switch Saturation Voltage | 0.4–0.8 V at 500 mA (VIN = 3 V) - limits conduction loss and thermal rise in high-efficiency boost topologies. |
| Input Voltage Range | 2 V to 9 V - supports single-cell Li-ion (2.7–4.2 V), NiMH (1.2 V × 2), or alkaline (1.5 V × 2) battery inputs. |
| Output Ripple | 16–40 mV peak-to-peak - meets noise requirements for analog sensors and microcontroller I/O without additional LC filtering. |
| Shutdown Threshold | VIL ≤ 0.8 V, VIH ≥ 2.0 V - ensures reliable interface with 3.3 V or 5 V logic controllers without level-shifting. |
Pinout & Package
ADP1109AN is housed in an 8-lead plastic DIP (N-8) package with 0.3" width, lead pitch of 0.1" (2.54 mm), and standard through-hole mounting. Pin 1 is marked by notch or dot; pins 2, 5, and 6 are internally unconnected (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply connection | Accepts 2–9 V DC input; must be decoupled with ≥10 µF ceramic capacitor near pin for stability. |
| 3 (SW) | Collector of internal NPN switch | Drives external inductor; requires low-inductance layout to minimize EMI and switching losses. |
| 4 (GND) | Power and signal ground reference | Must be connected to low-impedance ground plane; shared return path for VIN, SW, and FB improves regulation. |
| 7 (SHUTDOWN) | Logic enable/disable control | Pulled low to disable oscillator; high-impedance input draws ≤20 µA - compatible with GPIOs of MSP430, STM32L, etc. |
| 8 (FB/SENSE) | Feedback node for output regulation | Internally connected to laser-trimmed resistor divider; directly tied to 3.3 V output - no external components needed. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 450 µA shutdown current enables >1-year battery life in low-duty-cycle sensor nodes using two AA cells. |
| Fixed-output simplicity | Zero external feedback components required for 3.3 V version - reduces BOM count and layout area vs. adjustable regulators. |
| Gated-oscillator control | Eliminates need for external compensation network, simplifying design validation and improving transient response stability. |
| Logic-compatible shutdown | TTL-level SHUTDOWN pin allows direct interfacing with microcontrollers without pull-up resistors or level shifters. |
| Low EMI switching | 120 kHz frequency avoids AM radio band and permits use of cost-effective ferrite-core inductors with minimal shielding. |
Applications
| Portable Instrumentation | Laser Diode Drivers |
|---|---|
|
Use Scenario: Handheld multimeter powered by two alkaline cells (1.5 V × 2) requiring clean 3.3 V for ADC and display controller. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3 V rail from declining 2.0–3.0 V battery input. Use Value: Maintains full-resolution ADC performance down to 2.0 V input, extending usable battery life by 35% vs. linear regulator. |
Use Scenario: Low-power laser pointer module needing precise 3.3 V bias for driver IC and modulation circuitry. IC Role / Device Role / Timing Role: Primary voltage source for laser diode biasing stage, synchronized to modulation timing via SHUTDOWN pin. Use Value: Enables rapid on/off pulsing (<10 µs response) with <40 mV ripple - prevents optical mode hopping in visible laser diodes. |
| Flash Memory VPP Generator | Hand-Held Inventory Computers |
|
Use Scenario: Embedded system using legacy parallel NOR flash requiring +12 V programming voltage (VPP), derived from 3.3 V main rail. IC Role / Device Role / Timing Role: Boost converter supplying 12 V VPP only during flash write cycles, controlled via SHUTDOWN pin. Use Value: Reduces standby power by 99.8% vs. always-on 12 V generator - critical for long-life firmware update capability. |
Use Scenario: Rugged barcode scanner operating on rechargeable NiMH pack (1.2 V × 4), needing regulated 3.3 V for CMOS image sensor and Bluetooth SoC. IC Role / Device Role / Timing Role: Main power supply for sensor and wireless subsystems, with SHUTDOWN coordinated to scan trigger events. Use Value: Achieves 200+ scans per charge by limiting boost operation to <100 ms bursts - extends runtime beyond 8 hours. |
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); fixed 5 V output; 100 kHz switching; 100 µA quiescent current. | Lower output current (100 mA max); unsuitable for >5 V outputs or high-efficiency >100 mA loads. | Select MAX680ESA+ only when inductor-free layout and ultra-low IQ outweigh need for 3.3 V output or >120 mA delivery. |
| TPS61200DRCR | Synchronous boost; adjustable output (0.9–5.5 V); 1.2 MHz switching; 50 µA quiescent current; integrated MOSFETs. | Requires external feedback resistors; higher efficiency above 100 mA but greater complexity and cost. | Choose TPS61200DRCR when >85% efficiency at 200 mA or programmable output is mandatory - not for drop-in 3.3 V replacement. |
Compared with MAX680ESA+ and TPS61200DRCR, ADP1109AN offers unique value as a fixed 3.3 V, inductor-based boost converter with proven reliability in industrial portable equipment, requiring zero external feedback components and supporting TTL shutdown - ideal where simplicity, known thermal behavior, and legacy design continuity matter most.
Availability
ADP1109AN is available at Aetrix Electronics and suitable for portable instrumentation, laser diode biasing, flash memory VPP generation, and hand-held inventory computers requiring stable component supply across extended production lifecycles.
Supply support for ADP1109AN 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 ADP1109 series was designed specifically for micropower, low-component-count DC-to-DC conversion in space-constrained portable electronics - emphasizing simplicity, battery longevity, and robustness across temperature and input voltage variation.
FAQ
What is the maximum output current supported by the ADP1109AN at 3.3 V?
The ADP1109AN delivers up to 100 mA at 3.3 V output when supplied from a 3 V input, as verified in the Typical Application section and confirmed by load regulation data showing stable output up to 100 mA across temperature. Exceeding this current risks thermal overload due to internal switch saturation voltage and package power dissipation limits.
Can the ADP1109AN be used with a 1.8 V input source?
No - the ADP1109AN requires minimum 2 V input per Absolute Maximum Ratings and Electrical Specifications tables. At 1.8 V, the internal comparator and oscillator fail to operate reliably, resulting in no regulation or intermittent startup. For sub-2 V inputs, consider the ADP1613 or similar ultra-low-VIN boost converters.
Is the ADP1109AN pin-compatible with other variants in the ADP1109 family?
Yes - all ADP1109 variants (ADP1109AN, ADP1109AN-3.3, ADP1109AN-5, ADP1109AN-12) share identical 8-lead DIP (N-8) pinout and package dimensions. Only the internal feedback resistor network differs; external connections (VIN, SW, GND, SHUTDOWN, FB/SENSE) remain functionally identical across versions.
What type of diode is recommended for use with the ADP1109AN?
The 1N5818 Schottky diode is explicitly recommended in the ADP1109 datasheet for ADP1109AN applications - it provides 0.5 V forward voltage at 1 A, fast recovery (<100 ns), and low leakage (4–10 µA), optimizing efficiency and minimizing output ripple. Surface-mount alternatives include MBRS130T3.
Does the ADP1109AN require external compensation components?
No - the ADP1109AN uses a gated-oscillator architecture with built-in comparator hysteresis (8–14 mV), eliminating the need for external frequency compensation networks. This is confirmed in the General Description and Application Information sections, which state "loop stability without requiring external components for frequency compensation."
ADP1109AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADP1109AN FAQ
1.How can I place an order for ADP1109AN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP1109AN 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 ADP1109AN reliable?
The price and inventory of ADP1109AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP1109AN is usually 5 days.
3.What payment methods are accepted for ADP1109AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP1109AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP1109AN?
ADP1109AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP1109AN 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 ADP1109AN?
For technical support, including ADP1109AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP1109AN requirements.
6.How does Aetrix verify that ADP1109AN is sourced from the original manufacturer or authorized distributors?
All ADP1109AN 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 ADP1109AN meets industry standards.
7.What is the process for return or replacement of ADP1109AN?
All ADP1109AN units undergo pre-shipment inspection (PSI). If there is an issue with ADP1109AN, 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 ADP1109AN part is unused and in its original packaging.
Return procedure for ADP1109AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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