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Analog Devices Inc. LT1107CS8-12#TRPBF
- Part No.:
- LT1107CS8-12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1107CS8-12#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 12V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,093
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Product details
Overview
LT1107CS8-12#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-output 12V DC/DC converter IC operating in step-up or step-down mode with internal 1A power switch, 320µA quiescent current, and 63kHz oscillator. It delivers up to 300mA at 12V from 24V input in buck mode and supports battery-powered palmtop computers, LCD bias generation, and peripheral supplies.
For engineers reviewing the LT1107CS8-12#TRPBF datasheet, LT1107CS8-12#TRPBF pinout, LT1107CS8-12#TRPBF application, or LT1107CS8-12#TRPBF equivalent, key selection criteria include its fixed 12V output voltage tolerance (±2.5%), adjustable current limit via ILIM pin, on-chip low-battery comparator, and SO-8 package compatibility with space-constrained portable designs.
Technical Context
The LT1107CS8-12#TRPBF uses a gated-oscillator architecture with internal 1.25V reference and comparator-based feedback control. Its 63kHz oscillator drives an NPN power switch with programmable duty cycle (64–76% in boost mode), enabling operation across 2V–30V input range while maintaining regulation via FB/SENSE pin monitoring of output voltage.
It integrates auxiliary gain block (AO/SET pins) for low-battery detection or linear post-regulation and features internal current limiting via ILIM pin resistor programming - critical for stable operation under wide VIN variation in battery-fed systems without external sensing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2.5% (guaranteed over 0°C to 70°C, load & line regulation) |
| Quiescent Current | 320µA (enables >1-year battery life in 2AA-cell systems) |
| Oscillator Frequency | 63kHz typical (optimized for surface-mount inductors/capacitors) |
| Input Voltage Range | 2V–12.6V (step-up), 3V–30V (step-down); supports single-cell to industrial rail inputs |
| Switch Current Limit | Programmable up to 1.5A via ILIM-to-VIN resistor (e.g., 220Ω → ~400mA) |
| Operating Temperature | 0°C to 70°C (commercial grade, suitable for consumer and industrial embedded use) |
| Package | 8-pin SO-8 (small-outline, 150°C/W thermal resistance, RoHS-compliant) |
Pinout & Package
LT1107CS8-12#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package with standard 1.27mm pitch, JEDEC MS-012AC compliant footprint, and exposed pad not present. Pin 1 (ILIM) sets current limit; Pin 2 (VIN) accepts 2–30V input; Pins 3/4 (SW1/SW2) form internal NPN switch; Pin 5 (GND) is power ground; Pin 6 (AO) is open-collector auxiliary output; Pin 7 (SET) is gain block input; Pin 8 (FB/SENSE) connects directly to 12V output for regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ILIM) | Current limit programming node | Resistor between ILIM and VIN sets peak switch current; open or tied to VIN disables limit |
| Pin 2 (VIN) | Main supply input | Accepts 2–30V; powers internal circuitry and switch driver |
| Pin 3 (SW1) | Switch collector | In boost: connects to inductor/diode; in buck: connects to VIN |
| Pin 4 (SW2) | Switch emitter | In boost: grounded; in buck: connects to inductor/load; must not go below –0.5V |
| Pin 5 (GND) | Power and signal reference | Common return for all internal blocks and external components |
| Pin 6 (AO) | Auxiliary gain block output | Open-collector NPN; sinks 300µA; used for low-battery flag or error amplification |
| Pin 7 (SET) | Gain block non-inverting input | Connected to resistor divider for trip point setting; referenced to internal 1.25V |
| Pin 8 (FB/SENSE) | Feedback input / output sense | On LT1107CS8-12#TRPBF, internally connected to 12V divider; must tie directly to regulated 12V output |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 320µA quiescent current enables multi-year battery life in always-on portable devices |
| Integrated 1A power switch | Eliminates need for external MOSFET or transistor, reducing BOM count and layout area |
| Fixed 12V output with ±2.5% accuracy | On-chip resistor network ensures stable 12V without external feedback resistors |
| Configurable step-up/step-down/inverting topology | Single IC supports 3 converter architectures via pin-strapping and external component selection |
| On-chip low-battery detector comparator | 1.25V reference + SET/AO pins enable user-defined undervoltage lockout without extra ICs |
| Adjustable current limit | Single resistor on ILIM pin prevents inductor saturation and switch overstress across wide VIN ranges |
Applications
| Palmtop Computer Logic Supply | LCD Bias Generator |
|---|---|
Use Scenario: Generating stable 12V from dual AA alkaline cells (2.0–3.2V) to power logic and display subsystems in handheld computing devices. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 12V output with micropower efficiency during standby and active modes. Use Value: Enables >150mA continuous 12V output from 2AA cells while consuming only 320µA quiescent current - extending battery runtime by 3× vs. alternatives. | Use Scenario: Providing negative bias voltage (e.g., –12V) for LCD segment drivers using positive-to-negative inverting configuration. IC Role / Device Role / Timing Role: Inverting DC/DC controller with internal switch, configured via SW1/SW2 pin routing and Schottky diode. Use Value: Delivers clean –12V at 50mA with <50mV ripple using only three external components - eliminating need for dual-rail supplies. |
| 24V-to-12V Industrial Peripheral Supply | Battery Backup System Converter |
Use Scenario: Converting 24V industrial bus voltage to regulated 12V for sensors, I/O modules, or communication interfaces. IC Role / Device Role / Timing Role: Step-down (buck) regulator operating at 63kHz with internal 1A switch and programmable current limit. Use Value: Supports 300mA at 12V from 24V input with 78% efficiency and no external pass transistor - simplifying thermal design in enclosed enclosures. | Use Scenario: Maintaining 12V output during main power failure using backup lithium or NiMH batteries (3–12V range). IC Role / Device Role / Timing Role: Dual-mode converter that auto-selects boost or buck based on input voltage relative to 12V output. Use Value: Seamless transition between primary and backup sources without output dropout - enabled by wide 2–30V input range and fast comparator response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1111CS8-12#TRPBF | Duty cycle limited to 50%; lower max output current (100mA @ 12V); same SO-8 package and pinout | Less suitable for high-current buck applications; better for ultra-low-noise boost where lower duty cycle reduces EMI | Select LT1111CS8-12#TRPBF only when 100mA output suffices and EMI reduction is prioritized over current capability |
| LM2662MX/NOPB | Charge-pump topology (no inductor); fixed 2× inversion; 100mA max; 125kHz switching | Cannot regulate output under load variation; unsuitable for precision 12V rails; limited to low-power bias generation | Choose LM2662MX/NOPB only for cost-sensitive, low-current (<50mA), inductor-free negative bias - not as direct functional replacement |
Compared with LT1111CS8-12#TRPBF and LM2662MX/NOPB, LT1107CS8-12#TRPBF offers higher output current (300mA), wider input range (2–30V), and true regulation in both buck and boost modes - making it uniquely suited for battery-backed 12V systems requiring stability across varying source voltages.
Availability
LT1107CS8-12#TRPBF is available at Aetrix Electronics and suitable for palmtop computers, LCD bias generators, and 24V-to-12V industrial peripheral supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1107CS8-12#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 acquired Linear Technology in 2017 and maintains full product support, datasheet archives, and application engineering resources for legacy Linear parts including the LT1107 family.
The LT1107CS8-12#TRPBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-operated portable equipment requiring high efficiency, minimal quiescent current, and flexible topology support in compact packages.
FAQ
What is the output voltage accuracy of the LT1107CS8-12#TRPBF over temperature and load?
The LT1107CS8-12#TRPBF guarantees a 12V output within ±2.5% (11.40V to 12.60V) over the full commercial temperature range (0°C to 70°C) and under all load conditions. This specification includes line regulation (0.02%/V over 5–30V input) and load regulation effects, verified per the datasheet's Electrical Characteristics table under "VOUT" parameter for LT1107-12 versions.
Can the LT1107CS8-12#TRPBF operate in step-down mode from a 24V input to deliver 12V at 300mA?
Yes, the LT1107CS8-12#TRPBF supports step-down operation from up to 30V input and can deliver 300mA at 12V from a 24V source, as confirmed in the Typical Applications section and performance graphs (e.g., Figure 1107 TA01). Efficiency reaches ~78% at this condition, and thermal dissipation remains within the SO-8 package's 500mW limit when properly laid out.
How is current limiting implemented on the LT1107CS8-12#TRPBF, and what resistor value sets 400mA?
Current limiting on the LT1107CS8-12#TRPBF is set by connecting a resistor between Pin 1 (ILIM) and Pin 2 (VIN). A 220Ω resistor programs the switch current limit to approximately 400mA, as specified in the datasheet's "Current Limit" row under Electrical Characteristics. The internal current-sense ratio and 80Ω internal resistor determine this relationship - no external sense resistor is required.
Is the LT1107CS8-12#TRPBF pin-compatible with other members of the LT1107 family, such as the LT1107CS8-5#TRPBF?
Yes, the LT1107CS8-12#TRPBF is fully pin-compatible with all SO-8 variants of the LT1107 family, including LT1107CS8-5#TRPBF and LT1107CS8#TRPBF. All share identical pinout, package dimensions, and electrical interface; only the internal feedback resistor network differs to set fixed 5V or 12V output - allowing drop-in replacement where output voltage matches system requirements.
Does the LT1107CS8-12#TRPBF require external components for basic operation, and what are the minimum parts?
Yes, the LT1107CS8-12#TRPBF requires three external components for basic operation: an inductor (e.g., 33µH), a Schottky diode (e.g., MBRS120T3), and an output capacitor (e.g., 100µF low-ESR). Unlike adjustable versions, it needs no feedback resistors since the 12V setpoint is internal - simplifying design and improving accuracy versus resistor-based solutions.
LT1107CS8-12#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, Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, Buck
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1107CS8-12#TRPBF FAQ
1.How can I place an order for LT1107CS8-12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107CS8-12#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 LT1107CS8-12#TRPBF reliable?
The price and inventory of LT1107CS8-12#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107CS8-12#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1107CS8-12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107CS8-12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107CS8-12#TRPBF?
LT1107CS8-12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107CS8-12#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 LT1107CS8-12#TRPBF?
For technical support, including LT1107CS8-12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107CS8-12#TRPBF requirements.
6.How does Aetrix verify that LT1107CS8-12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1107CS8-12#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 LT1107CS8-12#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1107CS8-12#TRPBF?
All LT1107CS8-12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1107CS8-12#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 LT1107CS8-12#TRPBF part is unused and in its original packaging.
Return procedure for LT1107CS8-12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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