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Analog Devices Inc. LT1109CN8-12#PBF
- Part No.:
- LT1109CN8-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1109CN8-12#PBF.pdf
- Description:
- IC REG BOOST 12V 1.2A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,803
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Product details
Overview
LT1109CN8-12#PBF from Analog Devices (formerly Linear Technology) is a fixed-output 12V step-up DC/DC converter in an 8-pin plastic DIP package, delivering up to 60mA from a 5V input with 120kHz oscillator frequency, 320µA quiescent current, and logic-controlled shutdown. It serves as a flash memory VPP generator and low-power 5V-to-12V converter in battery-powered peripherals.
For engineers reviewing the LT1109CN8-12#PBF datasheet, LT1109CN8-12#PBF pinout, LT1109CN8-12#PBF application, or LT1109CN8-12#PBF equivalent, key selection criteria include minimum 1.6V start-up voltage, 12.00V ±0.48V output accuracy at full load, shutdown pin compatibility, and use of off-the-shelf 33µH inductors without frequency compensation.
Technical Context
The LT1109CN8-12#PBF implements a gated-oscillator topology with internal 1.25V reference and comparator-based feedback control. Its 120kHz fixed-frequency operation enables compact external passive component selection, while the separate SENSE pin allows input-referred regulation independent of VOUT.
Logic-controlled SHUTDOWN disables the oscillator when driven low, reducing system-level standby power; quiescent current remains 320µA during shutdown. The integrated 1.2A switch features 0.7V typical saturation voltage at 500mA, supporting efficient energy transfer in discontinuous conduction mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12.00V ±0.48V (ensures reliable flash programming across temperature and load) |
| Oscillator Frequency | 120kHz (enables use of small surface-mount 33µH inductors and 22µF capacitors) |
| Quiescent Current | 320µA (minimizes battery drain in always-on peripheral circuits) |
| Start-Up Voltage | 1.6V (supports single-cell Li-ion or dual-cell NiMH operation) |
| Switch Saturation Voltage | 0.7V max at 500mA (limits conduction loss to ≤350mW at rated load) |
| Shutdown Input Threshold | VIL = 0.8V, VIH = 2.0V (compatible with TTL and CMOS logic interfaces) |
| Duty Cycle Range | 45–60% (optimized for 5V→12V conversion with stable loop response) |
Pinout & Package
LT1109CN8-12#PBF uses an 8-lead plastic DIP (N8) package with 0.300-inch width, 0.100-inch lead pitch, and through-hole mounting. Thermal resistance θJA = 130°C/W supports 300mW maximum power dissipation at TA = 25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 3V to 12V DC; powers internal circuitry directly (not bootstrapped) |
| NC | No Connect | Pin 2 and Pin 7 are unconnected; must be left floating or grounded per layout guidelines |
| SW | Switch Node | Drives external inductor; handles peak currents up to 1.2A with 0.7V saturation |
| GND | Ground Reference | Common return for VIN, SENSE, SHUTDOWN, and output capacitor negative terminal |
| SENSE | Feedback Input | Monitors regulated output via resistor divider; sets 12V output with internal 1.25V reference |
| SHUTDOWN | Enable Control | Active-low logic input; pulls oscillator offline when ≤0.8V, retaining 320µA quiescent draw |
| NC | No Connect | Pin 6 and Pin 8 are unconnected in fixed-output -12 variant; not used for feedback |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V Output | Eliminates external resistor divider, reducing BOM count and layout sensitivity for VPP generation |
| Logic-Controlled Shutdown | Enables system-level power gating without external MOSFETs or level shifters |
| 120kHz Oscillator | Permits use of low-cost, high-current 33µH surface-mount inductors with <0.5Ω DCR |
| 320µA Quiescent Current | Extends battery life in always-on PC plug-in cards and disk drive controllers |
| 1.6V Minimum Start-Up | Supports operation from partially discharged 2-cell alkaline or NiMH batteries |
Applications
| Flash Memory Programming | Disk Drive Power Supply |
|---|---|
Use Scenario: Generating +12V VPP for EPROM/EEPROM programming in embedded test fixtures and legacy development systems. IC Role / Device Role / Timing Role: Standalone high-voltage DC/DC converter providing regulated programming voltage with no microcontroller involvement. Use Value: Delivers stable 12V at 60mA from 5V rail with <120mV ripple, meeting JEDEC VPP tolerance requirements for 27C256 and similar devices. | Use Scenario: Supplying auxiliary 12V bias for voice coil motor drivers and spindle motor pre-bias in 2.5-inch HDD controller boards. IC Role / Device Role / Timing Role: Low-quiescent boost converter operating from main 5V supply during spin-up and standby modes. Use Value: Maintains 12V output under 40mA load with 1.6V start-up capability, enabling reliable motor initialization from weak battery sources. |
| PC Plug-In Card Power | Battery-Powered Peripherals |
Use Scenario: Providing isolated 12V for RS-232 transceivers, opto-isolator drivers, and analog front-end biasing on ISA/PCI add-in cards. IC Role / Device Role / Timing Role: Compact, self-contained boost stage eliminating need for external regulators or transformers. Use Value: Achieves 12V output with only three external components (inductor, diode, capacitor), reducing board area by >40% vs. discrete solutions. | Use Scenario: Powering 12V LCD backlights, piezoelectric buzzers, and IR emitters in handheld medical monitors and portable data loggers. IC Role / Device Role / Timing Role: Primary high-efficiency voltage booster operating from single 3.6V Li-ion cell with programmable shutdown. Use Value: Extends runtime by 3.2 hours per 500mAh battery due to 320µA shutdown current and 120kHz switching efficiency peak. |
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 |
|---|---|---|---|
| LT1109CS8-12 | Same electrical specs; SOIC-8 package instead of DIP-8; θJA = 150°C/W | Suitable for space-constrained PCBs requiring surface-mount assembly | Select when automated reflow is preferred over through-hole soldering and thermal margin allows higher junction rise |
| LT1301CS8-12 | 200mA output capability; 20µA shutdown current; 1.5MHz switching frequency | Higher current and lower IQ support more demanding peripherals like USB hubs or sensor arrays | Choose when load exceeds 60mA or ultra-low shutdown leakage is critical for multi-year battery life |
Compared with LT1109CN8-12#PBF, LT1109CS8-12 offers identical performance in a smaller footprint but reduced thermal margin, while LT1301CS8-12 provides triple the output current and 16× lower shutdown current at the cost of higher EMI and tighter layout constraints.
Availability
LT1109CN8-12#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, long-term lifecycle support, and traceable sourcing.
Supply support for LT1109CN8-12#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 designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications systems, with heritage from Linear Technology's high-performance DC/DC portfolio.
The LT1109 product line delivers micropower, low-cost step-up converters optimized for battery-powered peripherals, flash memory VPP generation, and compact 5V-to-12V conversion where minimal external components and guaranteed start-up below 2V are essential.
FAQ
What is the minimum input voltage required for LT1109CN8-12#PBF to start regulating?
The LT1109CN8-12#PBF requires a minimum of 1.6V at the VIN pin to initiate oscillation and regulate its 12V output. This start-up threshold is guaranteed across the full 0°C to 70°C operating temperature range and enables reliable operation from partially discharged 2-cell alkaline or NiMH batteries. Below 1.6V, the device remains inactive with only leakage current flowing.
Can LT1109CN8-12#PBF be used to generate 12V from a 3V input?
No - the LT1109CN8-12#PBF is specified for 12V output only when VIN is between 3V and 12V, but its recommended input range for 60mA output is 5V. At 3V input, output current drops significantly due to duty cycle limitation and switch losses; the datasheet confirms 60mA delivery only at VIN = 5V. For 3V-to-12V conversion, the LT1109CZ-12 in TO-92 is characterized, but not the N8 package variant.
Does LT1109CN8-12#PBF require external compensation components?
No, the LT1109CN8-12#PBF uses a gated-oscillator architecture with built-in hysteresis in its comparator, eliminating the need for external frequency compensation networks. This simplifies design and reduces component count to just three externals: inductor, Schottky diode, and output capacitor - all standard off-the-shelf parts.
What is the purpose of the SENSE pin on LT1109CN8-12#PBF?
The SENSE pin on LT1109CN8-12#PBF provides feedback for output voltage regulation. It connects to the output node through a resistor divider in adjustable versions, but in the fixed-output LT1109CN8-12#PBF, it is internally tied to set 12V. This pin enables input-referred regulation, allowing the IC to draw power from VIN rather than VOUT, improving efficiency versus bootstrapped topologies.
Is LT1109CN8-12#PBF RoHS compliant and lead-free?
Yes, LT1109CN8-12#PBF carries the #PBF suffix indicating lead-free (Pb-free) and RoHS-compliant packaging. The device meets EU Directive 2011/65/EU requirements, with homogeneous lead content below 1000 ppm and exemption 7a applied for high-melting-temperature solder alloys in the DIP package leads.
LT1109CN8-12#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1109CN8-12#PBF FAQ
1.How can I place an order for LT1109CN8-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1109CN8-12#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 LT1109CN8-12#PBF reliable?
The price and inventory of LT1109CN8-12#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1109CN8-12#PBF is usually 5 days.
3.What payment methods are accepted for LT1109CN8-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1109CN8-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1109CN8-12#PBF?
LT1109CN8-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1109CN8-12#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 LT1109CN8-12#PBF?
For technical support, including LT1109CN8-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1109CN8-12#PBF requirements.
6.How does Aetrix verify that LT1109CN8-12#PBF is sourced from the original manufacturer or authorized distributors?
All LT1109CN8-12#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 LT1109CN8-12#PBF meets industry standards.
7.What is the process for return or replacement of LT1109CN8-12#PBF?
All LT1109CN8-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1109CN8-12#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 LT1109CN8-12#PBF part is unused and in its original packaging.
Return procedure for LT1109CN8-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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