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Analog Devices Inc. LT1107CS8-12#PBF
- Part No.:
- LT1107CS8-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1107CS8-12#PBF.pdf
- Description:
- IC REG BUCK BOOST 12V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,640
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Product details
Overview
LT1107CS8-12#PBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-output 12V DC/DC converter IC operating in step-up, step-down, or inverting modes. It features 320µA quiescent current, internal 1A power switch, 63kHz oscillator, user-adjustable current limit via ILIM pin, and operates from 2V to 30V input. It delivers up to 300mA at 12V from 24V input in step-down mode for battery backup supplies.
For engineers reviewing the LT1107CS8-12#PBF datasheet, LT1107CS8-12#PBF pinout, LT1107CS8-12#PBF application, or LT1107CS8-12#PBF equivalent, key selection criteria include its fixed 12V output accuracy (±2.5%), low-battery detector capability via AO/SET pins, 70% duty cycle in step-up mode, SO-8 package thermal resistance (θJA = 150°C/W), and compatibility with surface-mount inductors and Schottky diodes.
Technical Context
The LT1107CS8-12#PBF implements a gated-oscillator architecture with a 1.25V internal reference and comparator-based feedback control. Its oscillator is fixed at 63kHz with 11µs ON time in step-up mode, enabling discontinuous conduction mode operation optimized for VOUT ≈ 3VIN.
It integrates an NPN power switch (1.5A max), on-chip current limit circuitry referenced to ILIM pin voltage, and an auxiliary open-collector gain block (AO/SET) usable as low-battery detector or error amplifier. The FB/SENSE pin connects internally to fixed 12V divider network (R1 = 25.5kΩ), eliminating external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2.5% (guaranteed over 0°C to 70°C, load and line regulation) |
| Quiescent Current | 320µA (enables >1-year battery life in 2AA-powered systems) |
| Oscillator Frequency | 63kHz typical (optimized for standard surface-mount inductors and capacitors) |
| Max Switch Current | 1.5A (supports high-current transient loads without external FET) |
| Duty Cycle (Step-Up) | 70% typical (increases available output current vs LT1111) |
| Input Voltage Range | 2V–12.6V (step-up), 30V (step-down); enables wide-input industrial and automotive use |
| Package Thermal Resistance | θJA = 150°C/W (SO-8 package limits power dissipation to 500mW at TA = 70°C) |
Pinout & Package
LT1107CS8-12#PBF uses an 8-pin plastic SOIC (SO-8, narrow 0.150") package with θJA = 150°C/W and rated for 0°C to 70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current Limit Reference Input | Connect to VIN for full 1.5A switch current; add resistor to VIN to program lower limit (e.g., 220Ω → ~400mA) |
| VIN (Pin 2) | Main Power Input | Accepts 2V–30V; powers internal oscillator, comparator, and driver circuits |
| SW1 (Pin 3) | Power Switch Collector | In step-up: drives inductor/diode; in step-down: connects to VIN; withstands 50V max |
| SW2 (Pin 4) | Power Switch Emitter | In step-up: connects to GND; in step-down: drives inductor/diode; must not go below –0.5V |
| GND (Pin 5) | Analog/Digital Ground | Common return for feedback, gain block, and switch emitter; requires low-impedance PCB plane |
| AO (Pin 6) | Auxiliary Gain Block Output | Open-collector NPN output sinking 300µA; used for low-battery detection or post-regulation |
| SET (Pin 7) | Gain Block Non-Inverting Input | Connects to resistor divider from VIN for programmable trip point (e.g., 1.25V reference × R1/R2) |
| FB/SENSE (Pin 8) | Feedback Input / Fixed Output Sense | Internally connected to 12V divider; must be tied directly to output for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 320µA quiescent current enables multi-year battery life in portable instruments and cellular telephones |
| Three-Component Design | Requires only inductor, diode, and output capacitor-no external resistors needed for fixed 12V output |
| Configurable Topology Support | Native support for step-up (boost), step-down (buck), and inverting (negative-output) configurations without redesign |
| Integrated Low-Battery Detection | AO/SET pins form a precision 1.25V-referenced comparator with <12.5mV hysteresis for reliable system shutdown |
| Programmable Current Limit | Single external resistor sets switch current limit, preventing inductor saturation and switch overstress across wide VIN ranges |
Applications
| Palmtop Computer Logic Supply | LCD Bias Generator |
|---|---|
Use Scenario: Generating stable 12V rail from dual AA alkaline cells (2.0–3.2V) to power logic and display interface circuitry. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 12V output with 320µA quiescent current to minimize battery drain. Use Value: Enables >100 hours of continuous operation per battery set while maintaining tight 12V ±2.5% output tolerance. | Use Scenario: Providing negative bias voltage for LCD segment drivers in handheld test equipment. IC Role / Device Role / Timing Role: Configured in inverting mode to generate –12V from +5V supply using single inductor and Schottky diode. Use Value: Eliminates need for separate negative supply rail; achieves <50mV ripple with optional gain-block ripple reduction. |
| Battery Backup Supply | 24V-to-12V Industrial Converter |
Use Scenario: Maintaining 12V system power during AC mains failure using supercapacitor or backup battery (3.0–5.5V). IC Role / Device Role / Timing Role: Step-up converter boosting low-voltage backup source to main 12V system rail. Use Value: Delivers 150mA at 12V from 2.5V input with 78% efficiency, ensuring uninterrupted operation of critical controllers. | Use Scenario: Converting 24V industrial bus to isolated 12V logic supply in PLC I/O modules. IC Role / Device Role / Timing Role: Step-down converter operating from 24V input to deliver 300mA at 12V with 82% efficiency at full load. Use Value: Supports wide input range (up to 30V) and provides robust thermal performance in SO-8 package at ambient ≤70°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1174CS8-12 | Higher 1.25A switch current, 85kHz oscillator, 250µA IQ, but requires external feedback resistors even for fixed outputs | Superior efficiency above 200mA; better suited for higher-power portable instruments | Select LTC1174CS8-12 when >250mA continuous output and lowest possible IQ are required; accept added BOM cost and layout complexity |
| MAX738AESA+ | Fixed 12V output, 300µA IQ, 1A switch, but only supports step-up mode and lacks AO/SET gain block | Lower component count for boost-only designs; no low-battery detection or post-regulation capability | Select MAX738AESA+ for space-constrained boost converters where auxiliary functions are unnecessary |
Compared with LTC1174CS8-12 and MAX738AESA+, the LT1107CS8-12#PBF uniquely combines topology flexibility (boost/buck/invert), integrated low-battery detection, and fixed-output simplicity in a single SO-8 package-making it optimal for multi-mode, battery-conscious industrial and portable systems.
Availability
LT1107CS8-12#PBF is available at Aetrix Electronics and suitable for palmtop computers, LCD bias generators, and battery backup supplies requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.
Supply support for LT1107CS8-12#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application notes for legacy Linear parts including the LT1107 family.
The LT1107CS8-12#PBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-operated systems demanding ultra-low quiescent current, minimal external components, and flexible voltage conversion topologies.
FAQ
What is the maximum output current capability of the LT1107CS8-12#PBF in step-down mode?
The LT1107CS8-12#PBF delivers up to 300mA at 12V from a 24V input in step-down mode, as confirmed in the Typical Applications section. This assumes proper thermal design (SO-8 θJA = 150°C/W), use of a Schottky diode, and adequate output capacitance. At higher ambient temperatures or with reduced airflow, derating is required to maintain reliability.
Does the LT1107CS8-12#PBF require external feedback resistors to set the 12V output?
No, the LT1107CS8-12#PBF does not require external feedback resistors. Its FB/SENSE pin (Pin 8) connects internally to a precision 25.5kΩ resistor network that sets the output to exactly 12V ±2.5%. The datasheet explicitly states "No external resistors are needed" for fixed-output versions like the LT1107CS8-12#PBF.
Can the LT1107CS8-12#PBF be used in inverting (positive-to-negative) configuration?
Yes, the LT1107CS8-12#PBF supports inverting configuration as documented in Figure 3 of the datasheet. In this mode, it generates –12V from a positive input (e.g., +5V), with |VOUT| limited to ≤6.2V unless modified with external diodes. The SO-8 package and internal switch enable compact implementation without additional active components.
What is the purpose of the AO and SET pins on the LT1107CS8-12#PBF?
The AO (Pin 6) and SET (Pin 7) pins form an auxiliary gain block usable as a low-battery detector, linear post-regulator, or error amplifier. The SET pin connects to the non-inverting input referenced to the internal 1.25V bandgap; AO provides an open-collector output sinking 300µA. This allows precise undervoltage lockout without adding discrete comparators.
Is the LT1107CS8-12#PBF pin-compatible with other members of the LT1107 family?
Yes, the LT1107CS8-12#PBF is pin-compatible with all LT1107 variants in the same SO-8 (S8) package, including LT1107CS8, LT1107CS8-5, and LT1107IS8. Pin functions, electrical characteristics, and thermal ratings are identical across S8-packaged versions-the only difference is the internal feedback resistor network (25.5kΩ for -12V output) and temperature grade (C-grade: 0°C to 70°C).
LT1107CS8-12#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, Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 63kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1107CS8-12#PBF FAQ
1.How can I place an order for LT1107CS8-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107CS8-12#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 LT1107CS8-12#PBF reliable?
The price and inventory of LT1107CS8-12#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107CS8-12#PBF is usually 5 days.
3.What payment methods are accepted for LT1107CS8-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107CS8-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107CS8-12#PBF?
LT1107CS8-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107CS8-12#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 LT1107CS8-12#PBF?
For technical support, including LT1107CS8-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107CS8-12#PBF requirements.
6.How does Aetrix verify that LT1107CS8-12#PBF is sourced from the original manufacturer or authorized distributors?
All LT1107CS8-12#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 LT1107CS8-12#PBF meets industry standards.
7.What is the process for return or replacement of LT1107CS8-12#PBF?
All LT1107CS8-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1107CS8-12#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 LT1107CS8-12#PBF part is unused and in its original packaging.
Return procedure for LT1107CS8-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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