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Analog Devices Inc. LT1109ACS8#PBF
- Part No.:
- LT1109ACS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1109ACS8#PBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:450
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Product details
Overview
LT1109ACS8#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#PBF datasheet, LT1109ACS8#PBF pinout, LT1109ACS8#PBF application, or LT1109ACS8#PBF equivalent, key selection factors include fixed 12V output accuracy (±4.2%), 120kHz oscillator frequency, 2A switch current rating, and compatibility with off-the-shelf surface-mount inductors like Coiltronics CTX33-2.
Technical Context
The LT1109ACS8#PBF implements a gated-oscillator architecture with a 1.25V internal reference and comparator-based feedback control. Its Burst Mode™ operation enables micropower efficiency without external frequency compensation components.
It features an integrated NPN power switch with 0.65V saturation voltage at 650mA (VIN = 3V), PGND and GND separation for improved noise immunity, and shutdown pin logic thresholds of VIH = 2.0V and VIL = 0.8V - enabling direct interface with 3.3V or 5V logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.00V ±4.2% (11.52V to 12.55V), suitable for Flash VPP programming compliance |
| Oscillator Frequency | 120kHz typical (105–135kHz), enables use of small surface-mount inductors & capacitors |
| Quiescent Current | 360µA max at shutdown, minimizing battery drain in standby mode |
| Switch Current Rating | 2A peak, supports transient load demands without external current limiting |
| Input Voltage Range | 2V to 9V, compatible with single-cell Li-ion, 3.3V, and 5V supply rails |
| Efficiency | ≥75% at 120mA load (VIN = 5V, VOUT = 12V), validated across –50°C to +100°C |
| Operating Temp | 0°C to 70°C ambient, with TJMAX = 90°C and θJA = 130°C/W (SO8 package) |
Pinout & Package
LT1109ACS8#PBF uses an 8-lead plastic SOIC (S8) package with 1.27mm pitch, JEDEC MS-012AC compliant, body size 5.0mm × 6.2mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Accepts 2V–9V unregulated input; connects to bulk capacitor and inductor feed |
| NC | No Connect | Unbonded pin; must remain floating per datasheet layout guidance |
| SW | Switch Node | Drives external diode and inductor; handles 2A peak switching current |
| PGND | Power Ground | Return path for switch current; separate from signal ground to reduce noise coupling |
| FB (SENSE) | Feedback Input | Monitors output via resistor divider; internally referenced to 1.25V for regulation |
| SHUTDOWN | Enable Control | Active-high logic input; pulls oscillator low when ≤0.8V, reducing IQ to 360µA |
| NC | No Connect | Unbonded pin; no internal connection; leave unconnected |
| GND | Signal Ground | Analog reference for FB and SHUTDOWN; ties to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Maintains regulation at light loads while holding quiescent current to 360µA, extending battery life |
| Integrated 2A NPN Switch | Eliminates need for external transistor; reduces BOM count and layout complexity |
| Logic-Compatible Shutdown | Direct interface with 3.3V/5V microcontrollers without level-shifting circuitry |
| Four-Component Solution | Requires only inductor, diode, input cap, and output cap - no compensation network needed |
| Surface-Mount Inductor Support | Validated with Coiltronics CTX33-2 and Sumida CD54-330LC, enabling compact PCB design |
Applications
| Flash Memory Programming | Disk Drive Power Supply |
|---|---|
Use Scenario: Generating 12V VPP for erasing/writing NOR/NAND flash in embedded storage modules. IC Role / Device Role / Timing Role: Primary high-voltage DC/DC converter supplying regulated 12V to flash VPP pin during programming cycles. Use Value: Delivers ≥150mA at 12V from 5V rail, sufficient to program four flash chips simultaneously with <120mV ripple. | Use Scenario: Providing auxiliary 12V bias for voice coil motor drivers and spindle motor pre-bias in portable HDDs. IC Role / Device Role / Timing Role: Standby-capable boost converter powering non-data-path analog circuitry during low-power idle states. Use Value: 360µA shutdown current preserves battery runtime; 120kHz switching avoids audible noise in sensitive audio environments. |
| PC Plug-In Card | Battery-Powered Peripherals |
Use Scenario: Adding 12V capability to ISA/PCI add-on cards lacking native high-voltage rails. IC Role / Device Role / Timing Role: Compact, self-contained boost stage converting 5V slot power to isolated 12V for legacy interface ICs. Use Value: SO8 footprint and four-external-component design enable integration into space-constrained card edge layouts. | Use Scenario: Powering RS-232 transceivers, LCD bias supplies, or EEPROM programmers in handheld test tools. IC Role / Device Role / Timing Role: Micropower VPP generator operating from single 3.3V or dual-cell alkaline supply. Use Value: 2V minimum input allows operation down to near-end-of-life battery voltage; fixed 12V output eliminates trimming resistors. |
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 |
|---|---|---|---|
| LT1300CS8#PBF | Higher 250kHz switching frequency; 3.5A switch; requires external compensation | Supports higher output currents (>300mA) and faster transient response but increases component count | Choose when >150mA 12V load or tighter regulation under dynamic load is required |
| TPS61040DRCT | 2.5V–6V input; 28V max output; integrated 500mA switch; 500kHz fixed-frequency PWM | Offers adjustable output and better light-load efficiency via PFM mode, but lacks PGND/GND separation | Prefer for designs needing programmable VOUT or lower EMI profile in noise-sensitive systems |
Compared with LT1109ACS8#PBF, LT1300CS8#PBF delivers higher current and speed at the cost of added external components, while TPS61040DRCT provides flexibility and integration at the expense of analog noise isolation - making LT1109ACS8#PBF optimal for cost-sensitive, low-noise flash VPP generation where fixed 12V and minimal BOM are critical.
Availability
LT1109ACS8#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 and long-term industrial availability.
Supply support for LT1109ACS8#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, reliability, and support continuity.
The LT1109A family was designed specifically for micropower flash memory VPP generation and low-cost, minimal-component boost conversion in battery-powered and peripheral applications.
FAQ
What is the output voltage tolerance of the LT1109ACS8#PBF?
The LT1109ACS8#PBF is a fixed 12V version with guaranteed output voltage of 11.52V to 12.55V (±4.2%) over temperature and line/load conditions, as specified in the Electrical Characteristics table at TA = 25°C and full operating range. This tolerance ensures reliable flash memory programming voltage compliance without external trimming.
Can the LT1109ACS8#PBF operate from a 2V input supply?
Yes, the LT1109ACS8#PBF supports input voltages from 2V to 9V. At 2V input, it can still regulate 12V output, though maximum deliverable current decreases due to duty cycle limitation - confirmed in typical performance graphs showing usable output down to VIN = 2V with appropriate inductor selection.
Does the LT1109ACS8#PBF require external frequency compensation components?
No, the LT1109ACS8#PBF uses a gated-oscillator architecture with inherent stability and does not require external frequency compensation components. Its 120kHz fixed-frequency operation and Burst Mode™ control eliminate the need for loop compensation networks, simplifying design and reducing component count to just four externals.
What is the purpose of the separate PGND and GND pins on the LT1109ACS8#PBF?
The LT1109ACS8#PBF separates PGND (power ground for the switch node) from GND (signal ground for FB and SHUTDOWN) to minimize noise coupling from high-current switching paths into the sensitive feedback and control circuitry. This improves regulation accuracy and reduces output voltage ripple, especially critical in precision VPP applications.
Which diode is recommended for use with the LT1109ACS8#PBF in a 12V boost design?
The MBRS130T3 Schottky diode is explicitly recommended in the LT1109ACS8#PBF datasheet for 12V boost designs. It offers low forward voltage (~0.3V), fast recovery (<5ns), and low leakage - ensuring high efficiency and stable operation. General-purpose rectifiers like 1N4001 are unsuitable due to excessive switching time and poor efficiency.
LT1109ACS8#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:
- 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#PBF FAQ
1.How can I place an order for LT1109ACS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1109ACS8#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#PBF reliable?
The price and inventory of LT1109ACS8#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#PBF is usually 5 days.
3.What payment methods are accepted for LT1109ACS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1109ACS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1109ACS8#PBF?
LT1109ACS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1109ACS8#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#PBF?
For technical support, including LT1109ACS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1109ACS8#PBF requirements.
6.How does Aetrix verify that LT1109ACS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1109ACS8#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#PBF meets industry standards.
7.What is the process for return or replacement of LT1109ACS8#PBF?
All LT1109ACS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1109ACS8#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#PBF part is unused and in its original packaging.
Return procedure for LT1109ACS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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