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Analog Devices Inc. LT1109CS8-12#TRPBF
- Part No.:
- LT1109CS8-12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1109CS8-12#TRPBF.pdf
- Description:
- IC REG BOOST 12V 1.2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,352
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Product details
Overview
LT1109CS8-12#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-output 12V step-up DC/DC converter IC in an 8-pin SOIC package, featuring 120kHz oscillator, 320µA quiescent current, logic-controlled shutdown, and 1.6V minimum start-up voltage. It delivers up to 80mA output from a 5V input and is used in flash memory VPP generation, PC plug-in cards, and battery-powered peripherals.
For engineers reviewing the LT1109CS8-12#TRPBF datasheet, LT1109CS8-12#TRPBF pinout, LT1109CS8-12#TRPBF application, or LT1109CS8-12#TRPBF equivalent, key selection criteria include fixed 12V output accuracy (±4.2%), shutdown pin compatibility, 33µH inductor requirement, and SOIC-8 thermal performance (θJA = 150°C/W).
Technical Context
The LT1109CS8-12#TRPBF implements a gated-oscillator boost topology with internal 120kHz switching frequency and comparator-based feedback using a 1.25V reference. Its SENSE pin monitors output voltage via external resistor divider, enabling regulation without frequency compensation components.
It features a logic-controlled SHUTDOWN pin (VIH = 2.0V min, VIL = 0.8V max) that disables the oscillator while maintaining 320µA quiescent current. The integrated 1.2A power switch has 0.7V typical saturation voltage at 500mA, supporting efficient energy transfer with off-the-shelf 33µH surface-mount inductors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.00V ±4.2% (11.52V–12.55V), enabling direct VPP programming for flash memory without external feedback resistors. |
| Oscillator Frequency | 120kHz typical (100–140kHz), allowing use of compact 33µH surface-mount inductors and reducing EMI vs lower-frequency converters. |
| Quiescent Current | 320µA typical at shutdown, minimizing standby power draw in battery-powered equipment with infrequent wake cycles. |
| Minimum Start-Up Voltage | 1.6V at VOUT pin, permitting operation from single-cell lithium or two-cell alkaline batteries under light load. |
| Switch Saturation Voltage | 0.7V typical at 500mA, limiting conduction loss to <350mW at full switch current and preserving efficiency above 80% at mid-load. |
| SHUTDOWN Pin Threshold | VIL ≤ 0.8V / VIH ≥ 2.0V, ensuring reliable TTL/CMOS-level control without additional level-shifting circuitry. |
| Duty Cycle Range | 45–60% at full load, optimizing inductor utilization and preventing saturation under worst-case input/output conditions. |
Pinout & Package
LT1109CS8-12#TRPBF is housed in an 8-lead plastic SOIC (S8) package with 150°C/W junction-to-ambient thermal resistance, suitable for reflow soldering and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 3V–12V DC input; powers internal circuitry directly-reducing quiescent power vs bootstrapped Z-package versions. |
| 2 (NC) | No Connect | Unbonded pin; must remain unconnected per datasheet to avoid latch-up or parametric shift. |
| 3 (SW) | Switch Node | Drives external inductor; handles peak currents up to 1.2A with 0.7V saturation drop-requires low-ESR catch diode (e.g., MBRS120T3). |
| 4 (GND) | Power Ground | Common return path for VIN, SW, and SENSE; must be low-impedance copper pour to minimize noise coupling into feedback loop. |
| 5 (SENSE) | Feedback Input | Monitors regulated output via resistor divider; sets 12V output by default-no external resistors needed for fixed-voltage operation. |
| 6 (SHUTDOWN) | Enable Control | Active-low logic input; pulls oscillator offline when ≤0.8V, reducing system power without altering output capacitor discharge path. |
| 7 (NC) | No Connect | Unbonded pin; electrically isolated-must not be tied to any net including ground or supply rails. |
| 8 (NC) | No Connect | Unbonded pin; no internal connection-leaving floating ensures stable operation and avoids unintended parasitic paths. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V Output | Eliminates external feedback resistors, reducing BOM count and layout area while guaranteeing ±4.2% regulation across temperature and line. |
| Logic-Controlled Shutdown | Enables microcontroller-driven power gating with sub-1µs response time, cutting system idle current without requiring external MOSFETs or LDOs. |
| 120kHz Switching Frequency | Permits use of standard 33µH surface-mount inductors (e.g., Sumida CD54-330LC), avoiding custom magnetics and easing EMI filtering design. |
| 320µA Quiescent Current | Extends battery life in portable peripherals by limiting no-load consumption to <1.6mW at 5V input-critical for always-on flash programming circuits. |
| 1.6V Minimum Start-Up | Supports direct operation from partially discharged 2-cell alkaline (≈2.4V) or Li-ion (≈3.0V) sources without pre-regulation, simplifying power architecture. |
Applications
| Flash Memory VPP Generation | PC Plug-In Card Power |
|---|---|
Use Scenario: Generating +12V programming voltage for NOR/NAND flash memory erase/write cycles in embedded systems. IC Role / Device Role / Timing Role: Primary high-voltage DC/DC converter supplying VPP rail; operates only during flash programming bursts. Use Value: Delivers stable 12V at 60–80mA with <120mV ripple, meeting JEDEC VPP tolerance requirements without external LDO post-regulation. | Use Scenario: Providing isolated 12V auxiliary power for legacy ISA or PCI add-in cards with analog front-ends or EEPROMs. IC Role / Device Role / Timing Role: Standby-capable boost converter powering card-specific functions independent of host 5V rail. Use Value: Logic-controlled shutdown enables host software to disable VPP generation between card configuration cycles, reducing total system standby power. |
| Battery-Powered Peripherals | Disk Drive Interface Circuits |
Use Scenario: Powering RS-232 transceivers or smart card readers from 3V–5V battery sources in handheld diagnostic tools. IC Role / Device Role / Timing Role: Compact, low-quiescent boost stage converting main battery voltage to required interface supply rails. Use Value: 320µA IQ and 1.6V start-up extend usable battery life by >20% versus comparable converters, especially in intermittent-use applications. | Use Scenario: Supplying 12V bias for magnetic head preamplifiers or servo control ICs in portable hard disk drives. IC Role / Device Role / Timing Role: Dedicated boost regulator delivering clean, low-noise 12V from 5V system rail during drive spin-up and seek operations. Use Value: Gated-oscillator architecture minimizes conducted EMI into sensitive analog signal paths, preserving SNR in head amplifier stages. |
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 |
|---|---|---|---|
| LTC1983ES6-12#TRMPBF | Higher 1.5MHz switching frequency, 25µA shutdown current, but requires external feedback resistors for 12V output. | Better suited for ultra-compact designs needing minimal inductor size; less ideal for cost-sensitive flash VPP where fixed output reduces BOM. | Select LTC1983ES6-12#TRMPBF when board space is constrained and 25µA shutdown justifies added resistor cost and layout complexity. |
| LT1301CS8-12#PBF | Delivers 12V at 200mA with 20µA shutdown current, but uses different pinout (SHUTDOWN on Pin 1) and higher 1.25V reference. | Preferred for higher-current disk drive or peripheral applications where 80mA limit of LT1109CS8-12#TRPBF is insufficient. | Choose LT1301CS8-12#PBF when sustained 120–200mA 12V output is required and PCB layout can accommodate pinout revision. |
Compared with LT1109CS8-12#TRPBF, LTC1983ES6-12#TRMPBF trades higher frequency and lower shutdown current for increased component count and cost, while LT1301CS8-12#PBF offers higher output current at the expense of non-drop-in replacement due to pinout and reference voltage differences.
Availability
LT1109CS8-12#TRPBF is available at Aetrix Electronics and suitable for flash memory programming, PC add-in card power, and battery-powered peripheral applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1109CS8-12#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1109CS8-12#TRPBF belongs to Linear's micropower DC/DC converter product line, designed specifically for cost-sensitive, low-power applications such as flash memory VPP generation and portable peripheral power where minimal external components and ultra-low quiescent current are critical.
FAQ
What is the output voltage tolerance of the LT1109CS8-12#TRPBF?
The LT1109CS8-12#TRPBF provides a fixed 12.00V output with a tolerance of ±4.2%, specified as 11.52V minimum to 12.55V maximum across temperature and line conditions. This tight regulation meets JEDEC requirements for flash memory VPP programming voltage and eliminates need for external trimming resistors or post-regulation circuitry in most applications.
Can the LT1109CS8-12#TRPBF operate from a single 3.7V Li-ion cell?
Yes, the LT1109CS8-12#TRPBF can start up from a single 3.7V Li-ion cell, as its minimum start-up voltage is 1.6V at the VOUT pin and it operates over an input range of 3V to 12V. At 3.7V input, it delivers up to 80mA at 12V with typical efficiency >75%, making it suitable for portable flash programmers and handheld peripherals.
Does the LT1109CS8-12#TRPBF require external feedback resistors to set its 12V output?
No, the LT1109CS8-12#TRPBF is a fixed-output variant-its 12V regulation is internally configured, so no external feedback resistors are required. The SENSE pin is pre-biased to achieve 12.00V output, simplifying design, reducing BOM count, and improving long-term stability compared to adjustable versions like LT1109CS8.
What is the maximum output current capability of the LT1109CS8-12#TRPBF at 5V input?
At 5V input, the LT1109CS8-12#TRPBF delivers up to 80mA continuous output current at 12V, as confirmed by the manufacturer's typical performance curve (TPC01) and application schematic TA01. This rating assumes use of a 33µH inductor (e.g., Sumida CD54-330LC) and proper thermal layout with SOIC-8 copper pour.
How does the SHUTDOWN pin function on the LT1109CS8-12#TRPBF?
The SHUTDOWN pin on the LT1109CS8-12#TRPBF is active-low: pulling it to ≤0.8V disables the internal oscillator and halts switching, reducing system power while maintaining 320µA quiescent current. When left open or tied to ≥2.0V, the device operates normally. No external pull-up is required, as internal bias ensures reliable startup.
LT1109CS8-12#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):
- 5V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.2A (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
LT1109CS8-12#TRPBF FAQ
1.How can I place an order for LT1109CS8-12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1109CS8-12#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 LT1109CS8-12#TRPBF reliable?
The price and inventory of LT1109CS8-12#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1109CS8-12#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1109CS8-12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1109CS8-12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1109CS8-12#TRPBF?
LT1109CS8-12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1109CS8-12#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 LT1109CS8-12#TRPBF?
For technical support, including LT1109CS8-12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1109CS8-12#TRPBF requirements.
6.How does Aetrix verify that LT1109CS8-12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1109CS8-12#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 LT1109CS8-12#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1109CS8-12#TRPBF?
All LT1109CS8-12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1109CS8-12#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 LT1109CS8-12#TRPBF part is unused and in its original packaging.
Return procedure for LT1109CS8-12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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