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Analog Devices Inc. LT1109ACS8-12#TRPBF
- Part No.:
- LT1109ACS8-12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1109ACS8-12#TRPBF.pdf
- Description:
- IC REG BOOST 12V 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,529
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Product details
Overview
LT1109ACS8-12#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter optimized for flash memory VPP generation, delivering fixed 12V output with up to 150mA load current from a 5V input, featuring 360µA standby current, 120kHz oscillator frequency, and logic-controlled shutdown. It operates in Burst Mode™ and requires only four external components.
For engineers reviewing the LT1109ACS8-12#TRPBF datasheet, LT1109ACS8-12#TRPBF pinout, LT1109ACS8-12#TRPBF application, or LT1109ACS8-12#TRPBF equivalent, key selection criteria include fixed 12V output accuracy (±4.2%), low-noise operation (60–120mV ripple), SO-8 package compatibility, and suitability for battery-powered flash programming circuits requiring minimal quiescent power.
Technical Context
The LT1109ACS8-12#TRPBF integrates a 120kHz gated oscillator, NPN power switch with 2A peak current rating, and internal 1.25V reference. Its feedback comparator monitors the SENSE (FB) pin to regulate output voltage via external resistor divider - though this is bypassed in fixed-output versions like the -12 variant.
Burst Mode™ operation enables micropower performance: the oscillator activates only when output voltage drops below regulation threshold, minimizing no-load current to 360µA while maintaining 12V ±0.48V accuracy across temperature (0°C to 70°C) and line (VIN = 2V to 12V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.00V (±4.2% tolerance; 11.52V–12.55V range ensures reliable flash VPP programming) |
| Max Output Current | 150mA at VIN = 5V (sufficient to concurrently program four standard flash memory chips) |
| Quiescent Current | 360µA (enables ultra-low standby power in battery-backed systems) |
| Oscillator Frequency | 120kHz (permits use of compact surface-mount inductors like 33µH CTX33-2 or CD54-330LC) |
| Shutdown Control | Logic-compatible input (VIH ≥ 2.0V, VIL ≤ 0.8V; pulls oscillator fully off, retaining 360µA IQ) |
| Switch Saturation Voltage | 0.65V at VIN = 3V/650mA (limits conduction loss; supports >80% efficiency at mid-load) |
| Output Ripple | 60–120mV (dictates minimum output capacitor ESR and value for stable VPP rail) |
Pinout & Package
LT1109ACS8-12#TRPBF is housed in an 8-lead plastic SOIC (SO-8, S8 package), 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant, tape-and-reel packaged (#TRPBF suffix). Pin 1 is marked with dot; device is not pin-compatible with adjustable LT1109A variants due to internal FB routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 2V–12V DC; powers internal circuitry and switch driver; must be decoupled with ≥22µF low-ESR capacitor |
| NC | No Connect | Pin 2 and Pin 7 are internally unconnected; must remain floating - not tied to GND or any signal |
| SW | Switch Node | Drives external inductor/diode; carries high di/dt pulses; requires short, low-inductance PCB trace |
| PGND | Power Ground | High-current return path for switch and inductor; separate from signal ground to minimize noise coupling |
| SENSE (FB) | Feedback Input | Internally connected to 12V divider; not user-accessible in fixed -12 version - unused externally |
| SHUTDOWN | Enable Control | Active-high logic input; drives oscillator gate; sinking <20µA when low, sourcing <10µA when high |
| NC | No Connect | See Pin 2 - no internal connection; leave unconnected |
| GND | Signal Ground | Reference for internal comparators and reference; connects to system ground plane with low-impedance path |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V Output | Eliminates external feedback resistors - reduces BOM count and layout sensitivity for VPP generation |
| Burst Mode™ Operation | Maintains regulation under light loads while holding IQ at 360µA - critical for long battery life in portable programmers |
| Logic-Controlled Shutdown | Enables system-level power sequencing; allows full output disable with zero load current except IQ |
| SO-8 Surface-Mount Package | Supports automated assembly and compact PCB footprint - compatible with standard 8-pin SOIC reflow profiles |
| Off-the-Shelf Inductor Support | Works with widely available 29–33µH SMT inductors (e.g., Coiltronics CTX33-2, Sumida CD54-330LC) |
Applications
| Flash Memory Programming | Disk Drive Power Supplies |
|---|---|
|
Use Scenario: Generating +12V VPP for erasing/writing NOR/NAND flash in embedded systems and BIOS update tools. IC Role / Device Role / Timing Role: Dedicated VPP generator IC providing regulated, low-noise 12V supply synchronized to flash command timing. Use Value: Delivers 150mA at 12V from 5V rail with <120mV ripple - meets JEDEC VPP tolerance requirements for reliable multi-chip programming. |
Use Scenario: Providing auxiliary 12V bias for voice coil motor (VCM) drivers or spindle motor pre-bias in 2.5″ HDDs. IC Role / Device Role / Timing Role: Compact, low-quiescent DC/DC booster enabling dual-rail operation from single 5V system bus. Use Value: 360µA standby current minimizes idle power draw; SO-8 footprint fits tight head-actuator board space constraints. |
| PC Plug-In Card Power | Battery-Powered Peripherals |
|
Use Scenario: Adding isolated 12V rail to ISA/PCI add-in cards lacking native 12V supply (e.g., legacy I/O or measurement modules). IC Role / Device Role / Timing Role: Standalone boost converter with shutdown control, enabling on-demand VPP activation during card initialization. Use Value: Four-component design (inductor, diode, two caps) simplifies integration onto small PCIe/ISA carrier boards without redesigning main PSU. |
Use Scenario: Portable flash programmers, handheld test equipment, and IoT edge nodes powered by 2–5V Li-ion or alkaline sources. IC Role / Device Role / Timing Role: Micropower VPP source enabling field firmware updates without external DC adapters. Use Value: Operates down to 2V input - supports full functionality even as battery discharges to end-of-life voltage. |
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 | Higher efficiency (up to 88%), 1.5MHz switching, integrated Schottky diode, SOT-23-6 package | Lower profile, faster transient response, but limited to 60mA output - insufficient for quad-flash programming | Select when board space is constrained and load ≤60mA; not suitable as direct replacement for LT1109ACS8-12#TRPBF's 150mA capability |
| MAX630CPA+ | 5V fixed output only; 100kHz oscillator; DIP-8 package; no shutdown pin; 500µA quiescent current | Legacy through-hole design; lacks programmable enable and 12V output - requires redesign for VPP function | Consider only for cost-sensitive, non-shutdown, 5V-only applications where SO-8 is not required |
Compared with LTC1983ES6-12#TRMPBF and MAX630CPA+, the LT1109ACS8-12#TRPBF uniquely balances 150mA 12V output, 360µA IQ, SO-8 packaging, and logic shutdown - making it irreplaceable for compact, battery-efficient flash VPP generation where higher current and fixed 12V are mandatory.
Availability
LT1109ACS8-12#TRPBF is available at Aetrix Electronics and suitable for flash memory programming, disk drive auxiliary power, and PC plug-in card VPP generation requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LT1109ACS8-12#TRPBF 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 including the LT1109A family.
The LT1109A series was designed specifically for low-power, fixed-output DC/DC conversion in memory programming and peripheral power applications - emphasizing simplicity, micropower operation, and robustness with off-the-shelf magnetics.
FAQ
What is the output voltage tolerance of the LT1109ACS8-12#TRPBF?
The LT1109ACS8-12#TRPBF delivers a fixed 12.00V output with a guaranteed tolerance of ±4.2% (11.52V to 12.55V) over temperature (0°C to 70°C), input voltage (2V to 12V), and load (0–150mA). This specification is confirmed in the Electrical Characteristics table and ensures compliance with flash memory VPP programming voltage windows.
Can the LT1109ACS8-12#TRPBF operate from a 2V input supply?
Yes, the LT1109ACS8-12#TRPBF supports input voltages as low as 2V, enabling operation directly from single-cell Li-ion or alkaline batteries near end-of-discharge. At VIN = 2V, it sustains regulated 12V output up to ~35mA - verified in Typical Performance Characteristics Figure TA05 and Electrical Characteristics table.
Does the LT1109ACS8-12#TRPBF require an external feedback resistor network?
No. The LT1109ACS8-12#TRPBF is a fixed-output variant: its internal feedback divider is factory-trimmed to 12V, and the SENSE (FB) pin is pre-connected. External resistors are unnecessary - unlike the adjustable LT1109A, which requires R1/R2. This eliminates tuning error and saves board space.
What is the maximum recommended inductor value for the LT1109ACS8-12#TRPBF?
The LT1109ACS8-12#TRPBF is characterized with 29–33µH inductors (e.g., Coiltronics CTX33-2, Sumida CD54-330LC). While higher values may reduce ripple, they increase turn-on time and risk saturation at peak switch current (2A). The datasheet specifies 33µH as optimal for 12V/150mA operation - exceeding this risks instability or reduced efficiency.
Is the LT1109ACS8-12#TRPBF RoHS-compliant and halogen-free?
Yes, the LT1109ACS8-12#TRPBF carries the #TRPBF suffix, indicating lead-free (Pb-free), RoHS-compliant, and halogen-free construction per Analog Devices' material declarations. The SO-8 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements.
LT1109ACS8-12#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1109ACS8-12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1109ACS8-12#TRPBF 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#TRPBF reliable?
The price and inventory of LT1109ACS8-12#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1109ACS8-12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1109ACS8-12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1109ACS8-12#TRPBF?
LT1109ACS8-12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1109ACS8-12#TRPBF 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#TRPBF?
For technical support, including LT1109ACS8-12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1109ACS8-12#TRPBF requirements.
6.How does Aetrix verify that LT1109ACS8-12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1109ACS8-12#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1109ACS8-12#TRPBF?
All LT1109ACS8-12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1109ACS8-12#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1109ACS8-12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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