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Analog Devices Inc. LT1109ACN8-12#PBF
- Part No.:
- LT1109ACN8-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1109ACN8-12#PBF.pdf
- Description:
- IC REG BOOST 12V 2A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,912
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Product details
Overview
LT1109ACN8-12#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter in 8-lead plastic DIP package, delivering fixed 12V output at ≥150mA from 5V input, with 360µA standby current and logic-controlled shutdown. It serves as a flash memory VPP generator in battery-powered peripherals and PC plug-in cards.
For engineers reviewing the LT1109ACN8-12#PBF datasheet, LT1109ACN8-12#PBF pinout, LT1109ACN8-12#PBF application, or LT1109ACN8-12#PBF equivalent, key selection factors include fixed 12V output accuracy (±4.1%), 120kHz oscillator frequency, 2A switch current rating, and operation across 2V–9V input range without internal current limiting.
Technical Context
The LT1109ACN8-12#PBF uses Burst Mode™ operation and a gated 120kHz oscillator to achieve micropower efficiency while delivering >2W output. Its internal NPN power switch and 1.25V reference enable precise feedback control via external resistors in adjustable versions - though this fixed-12V variant omits FB pin usage.
Shutdown functionality gates the oscillator directly, reducing quiescent current to 360µA with no output ripple suppression circuitry required. The device lacks internal switch current limiting, making it best suited for stable-input applications like 5V rail conversion rather than wide-varying battery sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.00V ±4.1% (11.52V–12.55V), enabling reliable flash programming voltage compliance |
| Input Voltage Range | 2V to 9V - supports 2V, 3.3V, and 5V system rails without external regulation |
| Switch Current Rating | 2A peak - sufficient for driving multiple flash chips simultaneously under transient load |
| Oscillator Frequency | 120kHz typical - enables use of compact surface-mount inductors (e.g., 33µH) and low-ESR capacitors |
| Quiescent Current | 360µA at shutdown - minimizes battery drain in always-on peripheral circuits |
| Operating Temp | 0°C to 70°C - suitable for commercial-grade embedded systems and PC add-in cards |
| Output Ripple | 60–120mV peak-to-peak - requires low-ESR output capacitor (e.g., AVX TPS series) for stability |
Pinout & Package
LT1109ACN8-12#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300" width, lead pitch of 0.100", and through-hole mounting compatibility. Pin 1 is marked with a notch or dot; pins are numbered counterclockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Accepts 2V–9V unregulated input; connects to bulk input capacitor (22µF) |
| NC | No Connect | Internally unused; must remain unconnected per datasheet |
| SW | Switch Node | Drives external diode (e.g., MBRS130T3) and inductor; handles 2A peak switching current |
| PGND | Power Ground | High-current return path for switch and inductor; separate from signal ground to reduce noise |
| FB (SENSE) | Feedback Input | Internally tied to 12V divider; not user-accessible in fixed-output -12 variant |
| SHUTDOWN | Logic Control | Active-low enable: <0.8V disables oscillator, >2.0V enables operation |
| NC | No Connect | Internally unused; must remain unconnected |
| GND | Signal Ground | Reference for FB comparator and shutdown logic; routed separately from PGND |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V Output | Eliminates external resistor network and associated tolerance drift - ensures consistent VPP for flash programming |
| 360µA Shutdown Current | Enables ultra-low-power sleep modes in portable peripherals without auxiliary power switches |
| Logic-Controlled Shutdown | Allows host microcontroller to disable converter synchronously with system power states |
| Four-Component Design | Requires only inductor, Schottky diode, input cap, and output cap - reduces BOM cost and board area |
| 120kHz Switching Frequency | Permits use of small, low-profile surface-mount inductors (e.g., Sumida CD54-330LC) and avoids audible noise |
Applications
| Flash Memory Programming | Disk Drive Power Supply |
|---|---|
|
Use Scenario: Generating 12V VPP for erasing/writing NOR/NAND flash in embedded controllers and BIOS modules. IC Role / Device Role / Timing Role: Primary high-voltage DC/DC converter supplying regulated programming voltage during flash write cycles. Use Value: Delivers 12V at 150mA+ from 5V rail, enabling simultaneous programming of four flash devices without external boost stages. |
Use Scenario: Providing auxiliary 12V bias for voice coil motor drivers and spindle motor pre-bias in 2.5" HDDs. IC Role / Device Role / Timing Role: Standby-capable voltage booster supporting rapid spin-up sequences in low-power disk drive designs. Use Value: 360µA shutdown current extends battery life during idle; 120kHz operation avoids EMI interference with servo control loops. |
| PC Plug-In Card Power | Battery-Powered Peripherals |
|
Use Scenario: Adding isolated 12V capability to ISA/PCI expansion cards lacking native high-voltage rails. IC Role / Device Role / Timing Role: Compact, self-contained VPP generator enabling legacy card compatibility with modern low-voltage motherboards. Use Value: 8-pin DIP footprint integrates easily into space-constrained add-in card layouts without redesigning power architecture. |
Use Scenario: Powering RS-232 transceivers, LCD backlights, or sensor bias networks in handheld test equipment. IC Role / Device Role / Timing Role: Micropower DC/DC stage converting single-cell Li-ion (3.3V) or dual-AA (3V) to stable 12V output. Use Value: Operates down to 2V input, supporting deep discharge battery operation while maintaining VPP regulation within ±4.1%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1109ACS8-12#PBF | Same electrical specs, but in 8-lead SOIC (S8) package - 5.0mm × 6.2mm surface-mount footprint | Preferred for automated SMT assembly; requires PCB re-layout due to different pad geometry and thermal profile | Select when board space is constrained and reflow soldering is available. |
| LT1111CS8-12#PBF | Includes internal 1.5A switch current limit and wider 1.8V–10V input range; higher 1.2mA quiescent current | Better suited for variable-input battery systems (e.g., 2–4 AA cells); adds overcurrent protection absent in LT1109ACN8-12#PBF | Choose when input voltage varies significantly or short-circuit robustness is required. |
Compared with LT1109ACS8-12#PBF, the LT1109ACN8-12#PBF offers identical performance in through-hole form for manual prototyping or legacy DIP-based systems; versus LT1111CS8-12#PBF, it trades current limiting and input flexibility for lower quiescent current and lower BOM cost in stable-rail applications.
Availability
LT1109ACN8-12#PBF is available at Aetrix Electronics and suitable for flash memory programming, disk drive auxiliary power, and PC plug-in card voltage boosting requiring stable component supply across industrial and commercial temperature ranges.
Supply support for LT1109ACN8-12#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 precision analog and power management portfolio with full datasheet, simulation model, and application note support.
The LT1109A family was designed specifically for low-cost, low-quiescent-current DC/DC conversion in flash memory VPP generation and peripheral power applications - prioritizing simplicity, minimal external components, and DIP/SO packaging for broad design adoption.
FAQ
What is the maximum output current capability of the LT1109ACN8-12#PBF?
The LT1109ACN8-12#PBF delivers up to 150mA continuous output current at 12V when supplied from a 5V input, as verified in the datasheet's Figure TA02. Peak switch current capability is rated at 2A, but sustained output is thermally limited by the 300mW maximum power dissipation in the N8 package. Derating is required above 25°C ambient.
Does the LT1109ACN8-12#PBF require an external feedback resistor network?
No - the LT1109ACN8-12#PBF is the fixed-output variant with internal resistor divider setting the 12V output. Unlike the adjustable LT1109A, its FB (SENSE) pin is pre-configured and not accessible for external adjustment. External resistors are unnecessary and must not be connected to avoid malfunction.
Can the LT1109ACN8-12#PBF operate from a 2V input source?
Yes - the LT1109ACN8-12#PBF supports input voltages from 2V to 9V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. At 2V input, output current capability decreases significantly due to duty cycle limitations and switch saturation voltage; typical output is ~35mA at 12V per Figure TA05.
What is the purpose of separating PGND and GND pins on the LT1109ACN8-12#PBF?
The LT1109ACN8-12#PBF separates PGND (power ground) and GND (signal ground) to isolate high-current switching return paths from sensitive analog reference and shutdown logic. This separation minimizes ground bounce and improves regulation accuracy and shutdown threshold stability - critical for reliable flash programming voltage delivery.
Which Schottky diode is recommended for use with the LT1109ACN8-12#PBF?
The MBRS130T3 surface-mount Schottky diode is explicitly recommended in the LT1109A datasheet for use with the LT1109ACN8-12#PBF. Its 30V reverse voltage rating, 1A average forward current, low 0.45V forward drop, and fast recovery (<5ns) ensure high efficiency and minimal output ripple compared to general-purpose rectifiers like the 1N4001.
LT1109ACN8-12#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 9V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- 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
LT1109ACN8-12#PBF FAQ
1.How can I place an order for LT1109ACN8-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1109ACN8-12#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 LT1109ACN8-12#PBF reliable?
The price and inventory of LT1109ACN8-12#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1109ACN8-12#PBF is usually 5 days.
3.What payment methods are accepted for LT1109ACN8-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1109ACN8-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1109ACN8-12#PBF?
LT1109ACN8-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1109ACN8-12#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 LT1109ACN8-12#PBF?
For technical support, including LT1109ACN8-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1109ACN8-12#PBF requirements.
6.How does Aetrix verify that LT1109ACN8-12#PBF is sourced from the original manufacturer or authorized distributors?
All LT1109ACN8-12#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 LT1109ACN8-12#PBF meets industry standards.
7.What is the process for return or replacement of LT1109ACN8-12#PBF?
All LT1109ACN8-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1109ACN8-12#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 LT1109ACN8-12#PBF part is unused and in its original packaging.
Return procedure for LT1109ACN8-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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