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Analog Devices Inc. LT1109ACN8#PBF
- Part No.:
- LT1109ACN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1109ACN8#PBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,827
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Product details
Overview
LT1109ACN8#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter in 8-lead plastic DIP package, designed as a flash memory VPP generator with fixed 12V output, 120kHz oscillator frequency, 360µA standby current, and logic-controlled shutdown. It delivers up to 150mA at 12V from a 5V input for simultaneous programming of multiple flash memory chips.
For engineers reviewing the LT1109ACN8#PBF datasheet, LT1109ACN8#PBF pinout, LT1109ACN8#PBF application, or LT1109ACN8#PBF equivalent, key selection criteria include input voltage range (2V–9V), output voltage accuracy (±2.5% at 12V), switch saturation voltage (0.65V typ at 650mA), thermal limits (TJMAX = 90°C), and compatibility with off-the-shelf surface-mount inductors.
Technical Context
The LT1109ACN8#PBF implements Burst Mode™ operation to maintain micropower efficiency while delivering >2W output power. Its gated-oscillator architecture eliminates need for external frequency compensation components and enables stable regulation without internal current limiting.
It features a precision 1.25V reference and comparator-based feedback loop controlling an NPN power switch. Shutdown functionality overrides oscillator operation independently of feedback, maintaining 360µA quiescent current when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.00V ±2.5% - ensures reliable flash memory programming voltage compliance per JEDEC standards. |
| Oscillator Frequency | 120kHz typical - enables use of compact 20–33µH surface-mount inductors and low-ESR tantalum capacitors. |
| Quiescent Current | 360µA max (shutdown off) - minimizes battery drain in portable flash programming systems. |
| Switch Saturation Voltage | 0.65V max at 650mA - reduces conduction loss and improves efficiency above 100mA load. |
| Input Voltage Range | 2V to 9V - supports direct operation from single-cell Li-ion (3.0–4.2V), 3.3V logic rails, or 5V bus supplies. |
| Shutdown Pin Threshold | VIL ≤ 0.8V, VIH ≥ 2.0V - compatible with TTL and CMOS logic-level control signals. |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade embedded systems and PC plug-in card environments. |
Pinout & Package
LT1109ACN8#PBF uses an 8-lead plastic DIP (N8) package with 0.300-inch width, through-hole mounting, and industry-standard lead pitch (0.100 inch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Accepts 2V–9V unregulated input; connects to bulk capacitor and inductor feed point. |
| NC | No Connect | Unbonded pin; must remain floating - no PCB trace or component connection. |
| SW | Switch Node | Drives external Schottky diode anode; carries high-frequency pulsed current up to 2A peak. |
| PGND | Power Ground | High-current return path for switch and inductor; separate from signal ground to reduce noise coupling. |
| FB (SENSE) | Feedback Input | Monitors output via resistor divider; internally referenced to 1.25V for fixed 12V configuration. |
| SHUTDOWN | Enable Control | Active-low logic input; pulls oscillator gate low to halt switching and reduce IQ to 360µA. |
| NC | No Connect | Unbonded pin; must remain floating - no PCB trace or component connection. |
| GND | Signal Ground | Reference for FB, SHUTDOWN, and internal circuitry; tied to PGND at single point near device. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Controlled Shutdown | Reduces system-level standby power by disabling switching while retaining full restart capability on pin transition. |
| Fixed 12V Output Configuration | Eliminates external feedback resistors - simplifies BOM and layout for flash VPP applications requiring precise 12V. |
| Off-the-Shelf Inductor Support | Enables use of standard 20–33µH surface-mount inductors (e.g., Coiltronics CTX20-1, Sumida CD54-220LC) without custom magnetics. |
| Burst Mode™ Operation | Maintains regulation down to µA load currents while holding IQ ≤ 360µA - critical for battery-backed memory programming. |
| Four-Component Total System | Requires only inductor, Schottky diode, input capacitor, and output capacitor - reduces bill-of-materials cost and board area. |
Applications
| Flash Memory Programming | Disk Drive Power Supply |
|---|---|
Use Scenario: Simultaneous programming of four 5V flash memory chips in embedded data loggers or firmware update modules. IC Role / Device Role / Timing Role: Generates regulated 12V VPP supply from 5V main rail using internal oscillator and NPN switch. Use Value: Delivers 150mA at 12V with ±2.5% accuracy, meeting JEDEC VPP tolerance requirements for NOR/NAND flash devices. | Use Scenario: Providing auxiliary 12V bias for voice coil motor (VCM) drivers and spindle motor pre-bias circuits in 2.5″ HDD controller boards. IC Role / Device Role / Timing Role: Step-up converter supplying isolated 12V rail from 3.3V or 5V system bus, synchronized to host command timing. Use Value: Enables compact, low-cost implementation without transformer-based isolation - reduces PCB footprint by >40% vs. discrete solutions. |
| PC Plug-In Card | Battery-Powered Test Equipment |
Use Scenario: Adding flash-programming capability to ISA or PCI expansion cards operating from +5V slot power. IC Role / Device Role / Timing Role: Standalone VPP generator with logic-controlled enable, interfacing directly to card's FPGA or microcontroller GPIO. Use Value: Eliminates need for external DC/DC module - allows full functionality within standard card height and power envelope (≤2.5W). | Use Scenario: Portable flash programmer powered by two AA alkaline cells (2.0–3.2V input range) used in field firmware validation. IC Role / Device Role / Timing Role: Micropower boost converter enabling 12V output across full battery discharge curve with <360µA quiescent draw. Use Value: Extends usable battery life to >120 hours in standby mode - critical for handheld diagnostic tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1983ES6-12#TRMPBF | 6-pin TSOT-23, 1.5MHz switching, 100mA output, integrated Schottky diode. | Higher frequency enables smaller passive components but lower output current; not suitable for 4-chip flash programming. | Select when board space is constrained and load ≤100mA; requires different layout and inductor selection. |
| MAX630CPA+ | 8-pin PDIP, 100kHz, fixed 5V/12V options, 120mA max, no shutdown pin. | Lacks logic-controlled shutdown and delivers lower output current; older architecture with higher IQ (600µA). | Select only for legacy replacement where shutdown control is unnecessary and load ≤120mA. |
Compared with LTC1983ES6-12#TRMPBF and MAX630CPA+, the LT1109ACN8#PBF provides higher output current (150mA), dedicated shutdown control, and proven reliability in flash VPP applications - making it optimal for cost-sensitive, medium-power boost needs in commercial temperature range.
Availability
LT1109ACN8#PBF is available at Aetrix Electronics and suitable for flash memory programming, disk drive auxiliary power, and PC plug-in card designs requiring stable component supply, long-term lifecycle support, and commercial-temperature grade performance.
Supply support for LT1109ACN8#PBF 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 acquired Linear Technology in 2017 and maintains its high-performance analog IC portfolio, including precision DC/DC converters and power management solutions.
The LT1109A product line was designed specifically for low-cost, micropower flash memory VPP generation in commercial embedded systems - emphasizing minimal external components, DIP/SO packaging flexibility, and robust operation across wide input voltage ranges.
FAQ
What is the maximum output current capability of the LT1109ACN8#PBF at 12V?
The LT1109ACN8#PBF delivers up to 150mA at 12V when supplied from a 5V input, as verified in the datasheet Figure TA02 and Absolute Maximum Ratings table. This output current supports simultaneous programming of up to four standard 5V flash memory devices under typical conditions.
Does the LT1109ACN8#PBF require external feedback resistors for its fixed 12V output?
No, the LT1109ACN8#PBF does not require external feedback resistors. Its fixed 12V output version integrates internal resistor scaling to the 1.25V reference, as confirmed in the Block Diagram (Figure BD) and Electrical Characteristics table where VOUT is specified as 11.52V–12.55V for LT1109A-12 variants.
Can the LT1109ACN8#PBF operate from a 2V input supply?
Yes, the LT1109ACN8#PBF supports input voltages as low as 2V, as stated in the Absolute Maximum Ratings (VIN: –0.4V to 20V) and Electrical Characteristics table (VIN min = 2V). At 2V input, it can generate 12V output but with reduced maximum load current compared to 5V operation.
What type of external diode is recommended for use with the LT1109ACN8#PBF?
The LT1109ACN8#PBF requires a fast-switching Schottky diode such as MBRS130T3 (surface-mount) or 1N5818 (through-hole), as explicitly recommended in the Applications section and Typical Application Schematics (Figures TA01–TA07). General-purpose rectifiers like 1N4001 are unsuitable due to excessive reverse recovery time.
Is the LT1109ACN8#PBF pin-compatible with other members of the LT1109A family?
Yes, the LT1109ACN8#PBF shares identical pinout and package dimensions with LT1109ACN8-5 and LT1109ACN8 (adjustable), as shown in the N8 Package drawing and Pin Function table. All three variants use the same 8-lead DIP footprint and terminal assignments, enabling drop-in substitution where output voltage requirements align.
LT1109ACN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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):
- 50V (Switch)
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 120kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1109ACN8#PBF FAQ
1.How can I place an order for LT1109ACN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1109ACN8#PBF 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 LT1109ACN8#PBF reliable?
The price and inventory of LT1109ACN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1109ACN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1109ACN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1109ACN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1109ACN8#PBF?
LT1109ACN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1109ACN8#PBF 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 LT1109ACN8#PBF?
For technical support, including LT1109ACN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1109ACN8#PBF requirements.
6.How does Aetrix verify that LT1109ACN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1109ACN8#PBF 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 LT1109ACN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1109ACN8#PBF?
All LT1109ACN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1109ACN8#PBF, 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 LT1109ACN8#PBF part is unused and in its original packaging.
Return procedure for LT1109ACN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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