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Analog Devices Inc. LT1109ACN8-5#PBF
- Part No.:
- LT1109ACN8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1109ACN8-5#PBF.pdf
- Description:
- IC REG BOOST 5V 2A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,712
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Product details
Overview
LT1109ACN8-5#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter in 8-lead plastic DIP package, delivering fixed 5V output at up to 110mA from 2V input, with 360µA standby current, 120kHz oscillator frequency, and logic-controlled shutdown. It serves as a flash memory VPP generator and low-input-voltage boost converter in battery-powered peripherals and PC plug-in cards.
For engineers reviewing the LT1109ACN8-5#PBF datasheet, LT1109ACN8-5#PBF pinout, LT1109ACN8-5#PBF application, or LT1109ACN8-5#PBF equivalent, key selection criteria include input voltage range (2V–9V), output sense voltage tolerance (±2.5%), shutdown pin logic thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V), and thermal limits (TJMAX = 90°C, θJA = 130°C/W).
Technical Context
The LT1109ACN8-5#PBF uses Burst Mode™ operation and a gated 120kHz oscillator to achieve micropower efficiency without external compensation. Its internal NPN switch (2A peak rating) drives an external inductor-diode-capacitor network, with feedback via the SENSE (FB) pin referenced to a 1.25V internal bandgap.
It features no internal current limiting-operation relies on stable input voltage and properly sized external components. Shutdown functionality disables the oscillator while maintaining 360µA quiescent draw, and the device operates across 0°C to 70°C ambient temperature with PGND/GND separation for improved noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±2.5% (VOUT = 4.75V–5.25V); enables direct programming of 5V-tolerant flash memory arrays. |
| Input Voltage Range | 2V to 9V; supports single-cell Li-ion (3.0–3.7V), NiMH (2.4V), or regulated 3.3V/5V rails. |
| Quiescent Current | 360µA typical (switch off); ensures minimal battery drain during standby in portable equipment. |
| Oscillator Frequency | 120kHz typical (105–135kHz); permits use of small, low-cost surface-mount inductors (e.g., 10–33µH). |
| Shutdown Thresholds | VIL ≤ 0.8V (active-low disable), VIH ≥ 2.0V; compatible with TTL/CMOS logic without level-shifting. |
| Switch Saturation Voltage | 0.65V max at VIN = 3V, ISW = 650mA; limits conduction loss and thermal rise under load. |
| Operating Temperature | 0°C to 70°C ambient; validated for commercial-grade embedded peripherals and industrial add-in cards. |
Pinout & Package
LT1109ACN8-5#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300-inch width, through-hole mounting, and standard 0.100-inch pin pitch. Pin 1 is marked with a notch or dot; pins are numbered counterclockwise from top-left when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 2V–9V unregulated input; connects to bulk capacitor and inductor feed point. |
| NC | No Connect | Unbonded pad; must remain unconnected per design-no routing or grounding. |
| SW | Switch Collector Node | Drives external inductor; high-voltage switching node (up to 50V) requiring careful layout. |
| PGND | Power Ground | Return path for switch current; separate from signal ground to minimize noise coupling. |
| FB (SENSE) | Feedback Input | Monitors output via resistive divider; internal 1.25V reference sets regulation threshold. |
| SHUTDOWN | Enable/Disable Control | Active-low logic input; pulls oscillator gate low to halt switching and reduce IQ to 360µA. |
| NC | No Connect | Unbonded pad; electrically isolated-must not be tied to any net. |
| GND | Signal Ground | Analog reference for FB and SHUTDOWN; routed separately from PGND to avoid ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Four-component solution | Requires only inductor, Schottky diode, input/output capacitors-reduces BOM cost and board area. |
| Burst Mode™ operation | Maintains regulation at light loads while holding IQ ≤ 500µA across full temperature range. |
| Logic-compatible shutdown | Direct interface to microcontroller GPIO without pull-ups or level shifters. |
| Off-the-shelf inductor support | Validated with Coiltronics CTX-series and Sumida CD54-series surface-mount inductors. |
| Separate PGND/GND pins | Enables clean power return path isolation, critical for low-noise analog sensing in mixed-signal systems. |
Applications
| Flash Memory Programming | Disk Drive Power Supply |
|---|---|
|
Use Scenario: Generating 5V VPP for erasing/writing NOR/NAND flash in embedded controllers and BIOS modules. IC Role / Device Role / Timing Role: Primary boost regulator supplying regulated 5V at up to 110mA from 2V–3.3V system rail. Use Value: Eliminates need for dedicated charge-pump IC or external 5V supply, reducing component count and PCB footprint. |
Use Scenario: Providing auxiliary 5V bias for spindle motor control logic and head-positioning circuitry in 2.5″ HDDs. IC Role / Device Role / Timing Role: Standby-capable DC/DC converter powering non-rotating subsystems during spin-down mode. Use Value: 360µA quiescent current extends idle battery life without compromising wake-up responsiveness. |
| PC Plug-In Card | Battery-Powered Peripherals |
|
Use Scenario: On-board 5V generation for FPGA configuration PROMs and I²C EEPROMs in PCIe add-in cards. IC Role / Device Role / Timing Role: Fixed-output boost converter operating from 3.3V slot power with shutdown controlled by host BIOS. Use Value: Enables hot-plug compatibility and firmware-controlled power gating without external enable sequencing. |
Use Scenario: Powering USB-to-serial bridges and sensor interfaces in handheld test equipment and medical monitors. IC Role / Device Role / Timing Role: Micropower voltage booster sustaining 5V rail during intermittent data transmission bursts. Use Value: Delivers >100mA peak current while drawing <500µA between transmissions-maximizing coin-cell or LiPo runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1109ACS8-5#PBF | Same electrical specs but in 8-lead SOIC (S8) package; 130°C/W θJA vs 150°C/W for N8. | Preferred for space-constrained, surface-mount designs; requires reflow-compatible layout. | Select when board assembly uses SMT-only process and thermal margin allows SOIC package. |
| LT1111CS8-5#PBF | Includes internal current limit (600mA), wider input range (1.8V–10V), higher efficiency at low VIN. | Better suited for variable-input sources like batteries; supports higher output current (150mA). | Choose when input voltage varies significantly (e.g., discharging Li-ion) or overcurrent protection is required. |
Compared with LT1109ACN8-5#PBF, the LT1109ACS8-5#PBF offers identical regulation performance in a smaller footprint but reduced thermal dissipation margin, while the LT1111CS8-5#PBF adds robustness for dynamic inputs at the cost of slightly higher quiescent current (550µA).
Availability
LT1109ACN8-5#PBF is available at Aetrix Electronics and suitable for flash memory programming, disk drive auxiliary power, and PC plug-in card applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for LT1109ACN8-5#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 product lines with full datasheet, simulation model, and application support.
The LT1109A family was designed specifically for low-cost, low-quiescent-current boost conversion in memory programming and peripheral power applications-emphasizing simplicity, minimal external parts, and commercial-temperature reliability.
FAQ
What is the maximum output current capability of the LT1109ACN8-5#PBF?
The LT1109ACN8-5#PBF delivers up to 110mA at 5V output when supplied from a 2V–5V input, as verified in the Electrical Characteristics table (VIN = 2V, VOUT = 5V). Performance degrades above this load due to switch saturation voltage and thermal limits-continuous operation beyond 110mA risks exceeding TJMAX = 90°C in the N8 package.
Does the LT1109ACN8-5#PBF require external compensation components?
No, the LT1109ACN8-5#PBF uses a gated-oscillator architecture with fixed 120kHz frequency and no internal compensation network. The datasheet explicitly states "no frequency compensation components required," enabling stable operation with only four external parts: inductor, Schottky diode, and two capacitors.
Can the LT1109ACN8-5#PBF operate from a 1.8V input source?
No-the LT1109ACN8-5#PBF has a minimum specified input voltage of 2V (per Absolute Maximum Ratings and Electrical Characteristics tables). Operation below 2V is not characterized and may result in failure to regulate or start-up; for 1.8V inputs, the LT1111CS8-5#PBF is recommended instead.
What is the purpose of the separate PGND and GND pins on the LT1109ACN8-5#PBF?
The LT1109ACN8-5#PBF separates PGND (power ground for the switch node) from GND (signal ground for FB and SHUTDOWN) to prevent high di/dt switching noise from modulating the feedback reference. This improves regulation accuracy and reduces output ripple-especially critical in noise-sensitive flash programming applications.
Is the LT1109ACN8-5#PBF RoHS compliant and lead-free?
Yes, the "#PBF" suffix in LT1109ACN8-5#PBF denotes lead-free (Pb-free) and RoHS-compliant packaging per Analog Devices' product marking convention. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and is rated for Pb-free reflow soldering profiles.
LT1109ACN8-5#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):
- 5V
- 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
LT1109ACN8-5#PBF FAQ
1.How can I place an order for LT1109ACN8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1109ACN8-5#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 LT1109ACN8-5#PBF reliable?
The price and inventory of LT1109ACN8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1109ACN8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1109ACN8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1109ACN8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1109ACN8-5#PBF?
LT1109ACN8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1109ACN8-5#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 LT1109ACN8-5#PBF?
For technical support, including LT1109ACN8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1109ACN8-5#PBF requirements.
6.How does Aetrix verify that LT1109ACN8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1109ACN8-5#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 LT1109ACN8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1109ACN8-5#PBF?
All LT1109ACN8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1109ACN8-5#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 LT1109ACN8-5#PBF part is unused and in its original packaging.
Return procedure for LT1109ACN8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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