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Analog Devices Inc. LT1109ACS8#TRPBF
- Part No.:
- LT1109ACS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1109ACS8#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,402
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Product details
Overview
LT1109ACS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter optimized for flash memory VPP generation and low-input-voltage boost applications. It delivers fixed 12V output at >150mA from 5V input, operates at 120kHz, draws only 360µA quiescent current in shutdown, and requires just four external components. It is used in PC plug-in cards and battery-powered peripherals where standby power minimization is critical.
For engineers reviewing the LT1109ACS8#TRPBF datasheet, LT1109ACS8#TRPBF pinout, LT1109ACS8#TRPBF application, or LT1109ACS8#TRPBF equivalent, key selection criteria include its fixed 12V output version, SO-8 package, logic-controlled shutdown capability, 120kHz oscillator frequency, and compatibility with off-the-shelf surface-mount inductors such as Coiltronics CTX33-2 or Sumida CD54-330LC.
Technical Context
The LT1109ACS8#TRPBF implements a gated-oscillator architecture with Burst Mode™ operation to achieve micropower efficiency without external frequency compensation. Its internal 1.25V reference compares against the FB (SENSE) pin voltage to regulate output via duty-cycle control of an integrated NPN switch.
It features a dedicated SHUTDOWN pin that disables the oscillator when pulled low, maintaining only 360µA supply current. The SW pin supports up to 2A peak switch current, and the device operates across 2V–9V input while delivering stable 12V output with ≤120mV ripple under full load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.00V ±4.6% (11.52V–12.55V), tightly regulated for flash programming voltage compliance |
| Oscillator Frequency | 120kHz typical (105–135kHz), enables use of small surface-mount inductors and capacitors |
| Quiescent Current | 360µA max in shutdown mode, minimizing battery drain in portable systems |
| Input Voltage Range | 2V to 9V, supporting direct operation from single-cell Li-ion or multi-cell alkaline supplies |
| Switch Saturation Voltage | 0.65V max at 650mA (VIN = 3V), limiting conduction loss in high-current boost paths |
| Output Ripple | 60–120mV peak-to-peak, compatible with flash memory VPP tolerance requirements |
| Duty Cycle | 60–77% at full load, enabling efficient energy transfer across input voltage variations |
Pinout & Package
LT1109ACS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with 1.27mm pitch, RoHS-compliant, and rated for 0°C to 70°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 2V–9V unregulated input; connects to input capacitor and inductor feed |
| NC | No connect | Pin 2 and Pin 7 are internally unused; must remain unconnected per datasheet |
| SW | Switch node | Drives external diode and inductor; handles 2A peak current and 50V transient voltage |
| PGND | Power ground | High-current return path for switch and inductor; separate from signal ground to reduce noise |
| FB (SENSE) | Feedback input | Monitors output via resistor divider; internal 1.25V reference sets regulation threshold |
| SHUTDOWN | Enable control | Active-high logic input; pulls low to disable oscillator and reduce IQ to 360µA |
| NC | No connect | Pin 7 is internally unused; floating or grounded connection not permitted |
| GND | Signal ground | Reference for FB, SHUTDOWN, and internal circuitry; routed separately from PGND |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Controlled Shutdown | Reduces system-level standby power by disabling switching while retaining 360µA supply draw |
| Fixed 12V Output Configuration | Eliminates external feedback resistors, simplifying BOM and layout for VPP generation |
| Four-Component Minimum Design | Requires only inductor, diode, input cap, and output cap-no compensation network needed |
| 120kHz Switching Frequency | Enables compact 33µH inductor selection (e.g., Coiltronics CTX33-2) and low-ESR tantalum output caps |
| Burst Mode™ Operation | Maintains regulation at light loads without pulse-skipping artifacts, preserving low-noise output |
Applications
| Flash Memory Programming | Disk Drive Power Supply |
|---|---|
Use Scenario: Generating 12V VPP for erasing and programming NOR/NAND flash memory in embedded controllers and BIOS modules. IC Role / Device Role / Timing Role: Primary high-voltage DC/DC converter supplying regulated programming voltage to flash array pins. Use Value: Delivers >150mA at 12V from 5V rail-sufficient to program four flash chips simultaneously with minimal external parts. | Use Scenario: Providing auxiliary 12V bias for voice coil motor drivers and spindle motor pre-bias circuits in 2.5″ HDDs. IC Role / Device Role / Timing Role: Standby-capable boost converter powering non-rotating subsystems during spin-up delay. Use Value: 360µA shutdown current extends battery life during idle periods without requiring system-level power sequencing. |
| PC Plug-In Card Power | Battery-Powered Peripherals |
Use Scenario: Adding isolated 12V rail to ISA/PCI add-on cards lacking native high-voltage support. IC Role / Device Role / Timing Role: Compact, self-contained boost stage converting +5V slot power to 12V for analog front-ends or relays. Use Value: SO-8 footprint and four-component design enable integration into tight card-edge layouts without thermal derating. | Use Scenario: Powering 12V LCD backlights or RS-232 transceivers from 3.3V or dual-cell alkaline sources. IC Role / Device Role / Timing Role: Input-flexible boost regulator supporting 2V–5V inputs while maintaining stable 12V output. Use Value: 2V minimum input allows operation down to near-dead battery states, extending usable runtime in handheld instruments. |
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 1.5MHz switching frequency; integrated Schottky diode; 100mA output current rating | Targeted at space-constrained, low-power applications-not suitable for >120mA flash programming loads | Select when board area is critical and load current ≤100mA; requires no external diode but trades output current for frequency |
| MAX680ESA+ | Charge-pump topology (no inductor); fixed ±10V dual output; 100mA per rail; 125kHz operation | Used where magnetic-free solution is mandatory; cannot deliver 12V at >100mA or support variable input below 4.5V | Select only for low-current, inductorless designs; unsuitable for flash VPP due to current and voltage limitations |
Compared with LTC1983ES6-12#TRMPBF and MAX680ESA+, the LT1109ACS8#TRPBF provides higher output current (150mA+), wider input range (2V–9V), and proven reliability in flash programming circuits-but requires an external inductor and diode, increasing BOM count slightly.
Availability
LT1109ACS8#TRPBF 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, long-term lifecycle support, and traceable sourcing.
Supply support for LT1109ACS8#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 its precision analog and power management portfolio. Linear pioneered high-performance DC/DC converters for demanding industrial and computing applications.
The LT1109A family was designed specifically for cost-sensitive, low-quiescent-current boost applications in flash memory systems and portable peripherals-emphasizing simplicity, minimal external parts, and robust VPP generation.
FAQ
What is the output voltage accuracy of the LT1109ACS8#TRPBF?
The LT1109ACS8#TRPBF provides a fixed 12V output with guaranteed accuracy of ±4.6% (11.52V to 12.55V) over temperature and line/load conditions. This specification ensures reliable flash memory programming voltage compliance without external trimming. The LT1109ACS8#TRPBF achieves this using an internal 1.25V reference and factory-trimmed feedback network specific to the -12 variant.
Can the LT1109ACS8#TRPBF operate from a 2V input source?
Yes, the LT1109ACS8#TRPBF supports input voltages as low as 2V, making it suitable for single-cell lithium or deeply discharged alkaline battery operation. At 2V input, it maintains regulation to 12V output with reduced maximum load current. The LT1109ACS8#TRPBF's ability to start and sustain oscillation down to 2V is confirmed in its Absolute Maximum Ratings and Electrical Characteristics tables.
Does the LT1109ACS8#TRPBF require external frequency compensation components?
No, the LT1109ACS8#TRPBF uses a gated-oscillator architecture with inherent stability, eliminating the need for external compensation capacitors or resistors. This simplifies design and reduces bill-of-materials count. The LT1109ACS8#TRPBF achieves stable regulation through fixed-frequency (120kHz) burst-mode control and internal error amplifier design.
What is the recommended external diode for use with the LT1109ACS8#TRPBF?
The MBRS130T3 Schottky diode is explicitly recommended in the LT1109ACS8#TRPBF datasheet for its low forward voltage (~0.3V), fast recovery (<10ns), and surface-mount compatibility. Using slower diodes like the 1N4001 will severely degrade efficiency or prevent proper operation. The LT1109ACS8#TRPBF's SW pin voltage swing and switching speed demand Schottky performance.
Is the LT1109ACS8#TRPBF pin-compatible with other variants in the LT1109A family?
Yes, all LT1109A variants-including LT1109ACS8#TRPBF, LT1109ACS8-5, and LT1109ACS8-12-share identical SO-8 pinouts and package dimensions. Pin functions (VIN, SW, PGND, FB, SHUTDOWN, GND) are consistent across versions; only internal feedback configuration differs. The LT1109ACS8#TRPBF is the tape-and-reel packaged version of the LT1109ACS8-12.
LT1109ACS8#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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1109ACS8#TRPBF FAQ
1.How can I place an order for LT1109ACS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1109ACS8#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#TRPBF reliable?
The price and inventory of LT1109ACS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1109ACS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1109ACS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1109ACS8#TRPBF?
LT1109ACS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1109ACS8#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#TRPBF?
For technical support, including LT1109ACS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1109ACS8#TRPBF requirements.
6.How does Aetrix verify that LT1109ACS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1109ACS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1109ACS8#TRPBF?
All LT1109ACS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1109ACS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LT1109ACS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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