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Analog Devices Inc. LT1109ACS8-5#TRPBF
- Part No.:
- LT1109ACS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1109ACS8-5#TRPBF.pdf
- Description:
- IC REG BOOST 5V 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,998
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Product details
Overview
LT1109ACS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter in SOIC-8 package, delivering fixed 5V output with up to 110mA load current from as low as 2V input, 360µA standby current, and 120kHz oscillator frequency-designed for flash memory VPP generation and low-voltage portable systems.
For engineers reviewing the LT1109ACS8-5#TRPBF datasheet, LT1109ACS8-5#TRPBF pinout, LT1109ACS8-5#TRPBF application, or LT1109ACS8-5#TRPBF equivalent, this device requires only four external components, supports logic-controlled shutdown, operates without frequency compensation, and targets cost-sensitive, battery-powered applications needing stable 5V rail generation from sub-5V sources.
Technical Context
The LT1109ACS8-5#TRPBF implements a gated-oscillator architecture with internal 1.25V reference and comparator-based feedback control. Its Burst Mode™ operation enables micropower quiescent current while maintaining regulation under light loads.
It integrates an NPN power switch rated for 2A peak current and 0.65V saturation voltage at 650mA (VIN = 3V), with shutdown pin compatibility (VIH ≥ 2.0V, VIL ≤ 0.8V) and no internal current limiting-requiring careful inductor selection to avoid overcurrent under wide VIN variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±2.5% (4.75–5.25V); tightly regulated for flash programming voltage compliance. |
| Input Voltage Range | 2.0V to 9.0V; enables direct operation from single Li-ion, NiMH, or dual alkaline cells. |
| Quiescent Current | 360µA typical (shutdown active); critical for battery runtime in standby modes. |
| Oscillator Frequency | 120kHz typical (105–135kHz); allows use of small, low-cost surface-mount inductors (e.g., 20–33µH). |
| Switch Saturation Voltage | 0.65V max at 650mA (VIN = 3V); limits conduction loss and thermal rise in compact layouts. |
| Shutdown Pin Threshold | VIL ≤ 0.8V / VIH ≥ 2.0V; compatible with standard CMOS/TTL logic interfaces. |
| Output Ripple | 25–50mV peak-to-peak; meets VPP tolerance requirements for most parallel NOR flash devices. |
Pinout & Package
LT1109ACS8-5#TRPBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm body, 1.27mm lead pitch, RoHS-compliant and tape-and-reel packaged (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power Input | Primary DC input (2V–9V); connects to battery or regulator output; bypassed with 22µF capacitor. |
| 2 - NC | No Connect | Internally unused; must be left floating or tied to GND per layout best practice. |
| 3 - SW | Switch Node | Collector of internal NPN switch; drives external Schottky diode (e.g., MBRS130T3) and inductor. |
| 4 - PGND | Power Ground | High-current return path for switch and inductor; separate from signal ground to minimize noise coupling. |
| 5 - FB (SENSE) | Feedback Input | Monitors output via resistor divider (not used in fixed-5V version; internally connected to 5V reference). |
| 6 - SHUTDOWN | Enable Control | Active-low logic input; pulls oscillator gate low when ≤0.8V, reducing IQ to 360µA. |
| 7 - NC | No Connect | Internally unused; must be left floating or tied to GND. |
| 8 - GND | Signal Ground | Reference for FB, SHUTDOWN, and internal circuitry; star-connected to PGND at single point. |
Key Features
| Feature | Design Value |
|---|---|
| Four-Component Solution | Requires only inductor, Schottky diode, input cap, and output cap-reduces BOM count and board area vs. controller+MOSFET solutions. |
| Logic-Controlled Shutdown | Enables system-level power sequencing; draws only 360µA during sleep, extending battery life in intermittent-use devices. |
| Gated-Oscillator Architecture | Eliminates need for external compensation network-simplifies design and improves stability across temperature and load. |
| Micropower Burst Mode™ Operation | Maintains regulation at light loads while minimizing average current draw-critical for flash programming duty cycles. |
| SOIC-8 Surface-Mount Package | Enables automated assembly and high-density PCB layouts; compatible with standard reflow profiles. |
Applications
| Flash Memory Programming | Disk Drive Power Supply |
|---|---|
|
Use Scenario: Generating +5V VPP for erasing/writing parallel NOR flash memory in embedded controllers and BIOS modules. IC Role / Device Role / Timing Role: Primary VPP generator supplying regulated 5V at up to 110mA with tight ripple control. Use Value: Eliminates need for external charge-pump IC or transformer-based supply-reducing cost and footprint by >40%. |
Use Scenario: Providing auxiliary 5V rail for spindle motor startup or servo control in 2.5-inch HDDs powered from 3.3V logic supply. IC Role / Device Role / Timing Role: Step-up converter delivering burst-capable 5V output synchronized with drive enable signals. Use Value: Enables single-rail 3.3V system design without dedicated 5V buck-boost converter or LDO post-regulator. |
| PC Plug-In Card | Battery-Powered Test Equipment |
|
Use Scenario: On-board 5V generation for legacy ISA or PCI add-in cards operating from 3.3V or 5V motherboard rails. IC Role / Device Role / Timing Role: Compact, low-noise DC/DC source supporting hot-plug detection and card initialization sequences. Use Value: Meets PCIe/ISA slot power constraints while maintaining <50mV ripple-ensuring reliable EEPROM and FPGA configuration. |
Use Scenario: Portable multimeter or logic analyzer requiring stable 5V for ADC reference and microcontroller core supply. IC Role / Device Role / Timing Role: Primary power stage converting 2×AA (2.0–3.2V) to regulated 5V with ultra-low standby drain. Use Value: Extends battery life to >200 hours in measurement mode due to 360µA quiescent current and efficient light-load operation. |
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 |
|---|---|---|---|
| LT1109ACS8-12#TRPBF | Fixed 12V output; higher VOUT tolerance (±4.6%), 120mA max at 5V input; same pinout and quiescent current. | Targets flash VPP requiring 12V (e.g., older EPROMs); not interchangeable without circuit redesign. | Select only if 12V output is required; shares identical footprint and shutdown interface but differs in feedback network and output capacitor rating. |
| MAX680ESA+ | Charge-pump topology; no inductor required; 5V output from 4.5–6.0V input; 100mA max; 120µA quiescent current. | Suitable for low-noise, low-EMI environments where magnetics are prohibited; cannot operate below 4.5V input. | Prefer for space-constrained, EMI-sensitive designs with ≥4.5V input; avoid when input drops below 2.5V or high efficiency at light load is critical. |
Compared with LT1109ACS8-5#TRPBF, the LT1109ACS8-12#TRPBF offers higher output voltage but identical package and control interface, while the MAX680ESA+ eliminates magnetics at the cost of input voltage range and peak current capability-making LT1109ACS8-5#TRPBF optimal for ultra-low-VIN, inductor-tolerant, cost-driven 5V boost applications.
Availability
LT1109ACS8-5#TRPBF 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 RoHS-compliant packaging.
Supply support for LT1109ACS8-5#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 embedded applications.
The LT1109A family was designed specifically for micropower flash memory VPP generation and low-input-voltage boost conversion-emphasizing minimal external parts, ultra-low IQ, and robust operation in portable and space-constrained systems.
FAQ
What is the minimum input voltage required for LT1109ACS8-5#TRPBF to regulate 5V output?
The LT1109ACS8-5#TRPBF guarantees regulation down to 2.0V input across temperature, delivering up to 110mA at 5V. Below 2.0V, output drops out of regulation; typical start-up occurs at ~1.8V, but full specification compliance begins at 2.0V as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
Can LT1109ACS8-5#TRPBF be used with ceramic output capacitors?
Yes, LT1109ACS8-5#TRPBF supports ceramic output capacitors, but requires attention to ESR: values below 10mΩ may cause instability due to insufficient zero placement. The datasheet recommends low-ESR tantalum (e.g., AVX TPS series) or aluminum polymer types; if using ceramics, add a 10–22mΩ damping resistor in series with the cap or select parts with controlled ESR.
Does LT1109ACS8-5#TRPBF include overcurrent protection?
No, LT1109ACS8-5#TRPBF has no internal overcurrent or short-circuit protection. Its 2A switch rating assumes proper external inductor selection (e.g., Sumida CD54-220LC) and thermal management. Under overload or short-circuit, the device relies on external current limiting or foldback via input supply derating-designers must implement external safeguards per application requirements.
What is the thermal performance of LT1109ACS8-5#TRPBF in SOIC-8 package?
LT1109ACS8-5#TRPBF has θJA = 150°C/W (SOIC-8, JEDEC standard PCB) and TJMAX = 90°C. At 110mA output and 3V input, typical power dissipation is ~180mW; junction temperature rise is ~27°C above ambient-well within safe margin. For continuous 150mA operation, increase copper area or add thermal vias to limit ΔT to <40°C.
Is LT1109ACS8-5#TRPBF pin-compatible with LT1109ACN8-5?
Yes, LT1109ACS8-5#TRPBF and LT1109ACN8-5 share identical pin functions and electrical specifications, differing only in package: SOIC-8 vs. PDIP-8. Both use the same pin numbering (VIN, NC, SW, PGND, FB, SHUTDOWN, NC, GND) and require identical external components-enabling drop-in replacement where board layout permits.
LT1109ACS8-5#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):
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1109ACS8-5#TRPBF FAQ
1.How can I place an order for LT1109ACS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1109ACS8-5#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 LT1109ACS8-5#TRPBF reliable?
The price and inventory of LT1109ACS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1109ACS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1109ACS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1109ACS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1109ACS8-5#TRPBF?
LT1109ACS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1109ACS8-5#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 LT1109ACS8-5#TRPBF?
For technical support, including LT1109ACS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1109ACS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1109ACS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1109ACS8-5#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 LT1109ACS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1109ACS8-5#TRPBF?
All LT1109ACS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1109ACS8-5#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 LT1109ACS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1109ACS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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