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Analog Devices Inc. LT1109ACS8-12#PBF
- Part No.:
- LT1109ACS8-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1109ACS8-12#PBF.pdf
- Description:
- IC REG BOOST 12V 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,199
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Product details
Overview
LT1109ACS8-12#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter in 8-lead SOIC 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 LT1109ACS8-12#PBF datasheet, LT1109ACS8-12#PBF pinout, LT1109ACS8-12#PBF application, or LT1109ACS8-12#PBF equivalent, key selection criteria include fixed 12V output accuracy (±4.1%), 120kHz oscillator frequency, 2A switch current rating, and compatibility with off-the-shelf surface-mount inductors such as Coiltronics CTX33-2 or Sumida CD54-330LC.
Technical Context
The LT1109ACS8-12#PBF employs Burst Mode™ operation and a gated 120kHz oscillator to achieve micropower efficiency without external compensation. Its internal NPN power switch features 0.65V saturation voltage at 650mA and supports up to 2A peak current.
Feedback is regulated via a precision 1.25V reference and comparator A1; the fixed 12V version uses internal resistor divider (R1 = 29kΩ, R2 = 250kΩ), eliminating external feedback components. Shutdown pin asserts low to disable oscillation while maintaining 360µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.00V ±4.1% (11.52V–12.55V), enabling reliable flash memory programming voltage compliance. |
| Oscillator Frequency | 120kHz typical (105–135kHz), permitting use of compact 33µH surface-mount inductors like CTX33-2. |
| Quiescent Current | 360µA typical in shutdown mode, minimizing battery drain in always-on peripheral applications. |
| Switch Current Rating | 2A peak, supporting simultaneous programming of up to four flash memory chips at 120mA load. |
| Input Voltage Range | 2V to 9V, allowing direct operation from single-cell Li-ion (3.0–4.2V) or dual-cell alkaline (2.4–3.2V) sources. |
| Output Ripple | 60–120mV peak-to-peak at full load, compatible with standard 47µF/20V tantalum output capacitors. |
| Operating Temperature | 0°C to 70°C ambient, validated for industrial-grade PC plug-in card and disk drive environments. |
Pinout & Package
LT1109ACS8-12#PBF is housed in an 8-lead plastic SOIC (S8) package, 0.150" wide, with gull-wing leads and RoHS-compliant matte tin finish. Thermal resistance θJA = 130°C/W enables operation at full load without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Accepts 2V–9V unregulated input; connects directly to battery or intermediate rail. |
| NC | No Connect | Pin 2 and Pin 7 are 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 accessible-fixed-output version omits external resistor network. |
| SHUTDOWN | Enable Control | Active-high logic input; <0.8V disables oscillator, >2.0V enables operation. |
| GND | Signal Ground | Reference for FB comparator and shutdown threshold; routed separately from PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Four-component solution | Requires only inductor, diode, input capacitor (22µF), and output capacitor (47µF)-no feedback resistors or compensation parts. |
| Burst Mode™ operation | Maintains regulation at light loads while holding quiescent current to 360µA, extending battery life in intermittent-use devices. |
| Logic-compatible shutdown | Direct interface with microcontroller GPIO pins; no level-shifting needed for 3.3V or 5V control signals. |
| Off-the-shelf inductor support | Validated with standard 33µH SMT inductors (Coiltronics CTX33-2, Sumida CD54-330LC), avoiding custom magnetics. |
| Robust switch protection | SW pin rated to 50V reverse voltage and 2A peak current, tolerating inductive kickback and transient overloads. |
Applications
| Flash Memory Programming | Disk Drive Power Supply |
|---|---|
|
Use Scenario: Generating +12V VPP programming voltage for NOR/NAND flash chips in embedded storage modules. IC Role / Device Role / Timing Role: Fixed-output step-up converter providing stable, low-noise 12V supply synchronized to write-enable pulses. Use Value: Delivers 150mA at 12V from 5V rail-enough to program four 28Fxxx-series flash devices simultaneously without external boost stages. |
Use Scenario: Providing auxiliary 12V bias for voice coil motor drivers and spindle motor pre-drivers in 2.5" HDDs. IC Role / Device Role / Timing Role: Micropower DC/DC converter operating during spin-up phase where main 12V rail is unstable. Use Value: 360µA shutdown current prevents battery drain during idle; 120kHz switching avoids audible coil whine in sensitive audio-adjacent systems. |
| PC Plug-In Card | Battery-Powered Peripherals |
|
Use Scenario: Adding programmable flash storage to ISA/PCI expansion cards with limited board space and no dedicated 12V source. IC Role / Device Role / Timing Role: Compact, surface-mount VPP generator integrated into card's power plane with minimal BOM impact. Use Value: SOIC-8 footprint and four-external-part design enable drop-in integration onto legacy card layouts without redesigning power delivery. |
Use Scenario: Powering 12V EEPROMs or EPROM sockets in handheld test equipment powered by two AA cells (2.4–3.2V). IC Role / Device Role / Timing Role: Step-up regulator bridging low-voltage battery source to high-voltage memory programming requirement. Use Value: Operates down to 2V input-supports full functionality across entire alkaline discharge curve without brownout reset. |
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 |
|---|---|---|---|
| LT1111CS8-12#PBF | Includes internal current limit (1.5A), wider input range (1.8V–10V), higher efficiency at variable input (e.g., discharging batteries). | Better suited for battery inputs with >2V variation; replaces LT1109ACS8-12#PBF where input drops below 3V under load. | Select when input voltage varies significantly; retains same SOIC-8 footprint but requires updated inductor (22µH). |
| TPS61042DRCT | Higher switching frequency (1.3MHz), smaller external components, but fixed 12V accuracy ±5% and 500µA shutdown current. | Enables ultra-compact layout for space-constrained portable designs; lacks PGND/GND separation for high-noise immunity. | Choose for miniaturized applications where PCB area is critical and ripple tolerance is relaxed; verify EMI with 1.3MHz harmonics. |
Compared with LT1109ACS8-12#PBF, LT1111CS8-12#PBF adds current limiting for robustness with varying input, while TPS61042DRCT trades quiescent current and noise performance for size reduction-neither is pin-compatible, requiring layout revision.
Availability
LT1109ACS8-12#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 traceable sourcing.
Supply support for LT1109ACS8-12#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 full technical and manufacturing continuity for legacy Linear power products.
The LT1109A family was designed specifically for cost-sensitive, low-quiescent-current flash memory VPP generation in industrial peripherals and legacy computing hardware.
FAQ
What is the output voltage tolerance of the LT1109ACS8-12#PBF?
The LT1109ACS8-12#PBF delivers a fixed 12.00V output with a guaranteed tolerance of ±4.1% (11.52V to 12.55V) across temperature and line/load conditions. This specification ensures reliable compliance with JEDEC-standard flash memory VPP requirements, and is verified at TA = 25°C with VIN = 5V and load currents up to 150mA.
Can the LT1109ACS8-12#PBF operate from a 2V input source?
Yes, the LT1109ACS8-12#PBF supports input voltages as low as 2V, enabling direct operation from partially discharged alkaline or NiMH battery packs. At 2V input, it delivers reduced output current (≈35mA at 12V), as confirmed in Typical Performance Curve G01 and Application Circuit TA05-making it viable for low-power flash programming in handheld instruments.
Does the LT1109ACS8-12#PBF require external feedback resistors?
No, the LT1109ACS8-12#PBF is a fixed-output variant with internal resistor divider (R1 = 29kΩ, R2 = 250kΩ) setting the 12V regulation point. Unlike the adjustable LT1109A, it has no FB pin connection-pins 5 (FB/SENSE) and 2/7 (NC) are not externally accessible, simplifying layout and reducing BOM count.
What is the maximum continuous output current of the LT1109ACS8-12#PBF?
The LT1109ACS8-12#PBF delivers over 150mA continuously at 12V output when supplied from a 5V source, as specified in the Applications section and validated in Figure TA02. This capability supports simultaneous programming of multiple flash memory chips, provided thermal limits (TJMAX = 90°C) and PCB copper area meet SOIC-8 derating guidelines.
Which diode is recommended for use with the LT1109ACS8-12#PBF?
The MBRS130T3 Schottky diode is explicitly recommended in the LT1109ACS8-12#PBF datasheet (Figure TA01) for its 30V reverse rating, 0.45V forward drop at 1A, and low leakage (<1µA). Its surface-mount SOD-123 package matches the SOIC-8 footprint constraints, and its fast recovery eliminates switching losses that would degrade efficiency with slower rectifiers like 1N4001.
LT1109ACS8-12#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1109ACS8-12#PBF FAQ
1.How can I place an order for LT1109ACS8-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1109ACS8-12#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 LT1109ACS8-12#PBF reliable?
The price and inventory of LT1109ACS8-12#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1109ACS8-12#PBF is usually 5 days.
3.What payment methods are accepted for LT1109ACS8-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1109ACS8-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1109ACS8-12#PBF?
LT1109ACS8-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1109ACS8-12#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 LT1109ACS8-12#PBF?
For technical support, including LT1109ACS8-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1109ACS8-12#PBF requirements.
6.How does Aetrix verify that LT1109ACS8-12#PBF is sourced from the original manufacturer or authorized distributors?
All LT1109ACS8-12#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 LT1109ACS8-12#PBF meets industry standards.
7.What is the process for return or replacement of LT1109ACS8-12#PBF?
All LT1109ACS8-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1109ACS8-12#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 LT1109ACS8-12#PBF part is unused and in its original packaging.
Return procedure for LT1109ACS8-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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