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Analog Devices Inc. LT1111CS8-12#TRPBF
- Part No.:
- LT1111CS8-12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1111CS8-12#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 12V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
LT1111CS8-12#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up/step-down DC/DC converter IC with fixed 12V output, internal 1A NPN power switch, 72kHz oscillator, and on-chip low-battery detector comparator. It operates from 2V to 30V input, delivers up to 100mA at 12V from 3V input in boost mode, and supports surface-mount inductor designs in compact SO-8 package.
For engineers reviewing the LT1111CS8-12#TRPBF datasheet, LT1111CS8-12#TRPBF pinout, LT1111CS8-12#TRPBF application, or LT1111CS8-12#TRPBF equivalent, key selection criteria include its fixed 12V output accuracy (±5%), programmable current limit via ILIM pin, 300µA quiescent current in shutdown, and compatibility with Schottky catch diodes and low-ESR output capacitors in portable power supply designs.
Technical Context
The LT1111CS8-12#TRPBF implements a gated-oscillator architecture where the 72kHz oscillator activates only when the feedback voltage falls below the 1.25V internal reference, enabling ultra-low quiescent current. Its dual-mode operation-step-up (boost) for VIN = 2V–12V and step-down (buck) for VIN = 5V–30V-is controlled by external component configuration, not internal logic.
Pin 8 (FB/SENSE) connects directly to the regulated 12V output; internal resistor divider sets VOUT = 12.00V ±5% (11.4–12.6V). The ILIM pin allows precise current limiting (e.g., 400mA with 220Ω to VIN), while A0 (pin 6) provides open-collector gain block output usable as low-battery detector or error amplifier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.00V ±5% (11.4–12.6V); no external feedback resistors required |
| Oscillator Frequency | 72kHz typical; optimized for standard surface-mount inductors without external timing components |
| Quiescent Current | 300–450µA (full temp range); enables multi-year battery life in always-on monitoring systems |
| Switch Current Limit | Programmable up to 1.5A; 400mA default with 220Ω from ILIM to VIN |
| Input Voltage Range | 2.0–12.6V (boost), 5.0–30.0V (buck); supports single-cell Li-ion, 9V alkaline, and industrial 24V rails |
| Operating Temperature | 0°C to 70°C (commercial grade); validated for use in consumer electronics enclosures |
| Package | SO-8 (small-outline integrated circuit); 150°C/W junction-to-ambient thermal resistance |
Pinout & Package
LT1111CS8-12#TRPBF uses an 8-pin plastic SOIC (S8) package with gull-wing leads, JEDEC MS-012AC compliant, 1.27mm pitch, and 5.0mm × 6.2mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit programming input | Connect resistor to VIN to set switch current threshold; open or tied to VIN for max rating |
| VIN (Pin 2) | Main power supply input | Accepts 2–30V; powers internal circuitry and switch driver; absolute max 36V |
| SW1 (Pin 3) | Power switch collector | In boost: connects to inductor/diode node; in buck: connects to input rail |
| SW2 (Pin 4) | Power switch emitter | In boost: connects to GND; in buck: connects to inductor/diode node; must not go < –0.5V |
| GND (Pin 5) | Analog and power ground reference | Common return for feedback, comparator, and oscillator; requires low-impedance PCB plane |
| A0 (Pin 6) | Auxiliary gain block output | Open-collector output sinking up to 300µA; used for low-battery detection or post-regulation |
| SET (Pin 7) | Gain block inverting input | Connects to resistor divider from VIN for comparator trip point setting; bias current 70–300nA |
| FB/SENSE (Pin 8) | Feedback input / fixed-voltage sense | On LT1111CS8-12#TRPBF: internally connected to 12V divider; must tie directly to output |
Key Features
| Feature | Design Value |
|---|---|
| Three-component topology | Requires only inductor, Schottky diode, and output capacitor for full 12V boost operation |
| Integrated low-battery detector | Comparator with 1.25V reference and 12.5mV hysteresis enables reliable undervoltage lockout |
| Step-up/step-down/inverting flexibility | Single IC supports boost (3V→12V), buck (12V→12V), and inverting (5V→–12V) topologies |
| 72kHz fixed-frequency switching | Enables use of low-cost, off-the-shelf 22–47µH surface-mount inductors with minimal EMI filtering |
| 1.5A internal NPN switch | Eliminates need for external transistor in ≤100mA 12V applications; reduces BOM count and layout area |
Applications
| Remote Controls | Flash Memory VPP Generators |
|---|---|
Use Scenario: Battery-powered infrared remote requiring stable 12V for LED driver or RF transmitter stage. IC Role / Device Role / Timing Role: Step-up DC/DC converter generating regulated 12V from single 3V alkaline cell. Use Value: Enables 12V functionality without bulky transformers or disposable 12V batteries; 300µA quiescent current extends shelf life. | Use Scenario: Embedded microcontroller system needing +12V programming voltage for EEPROM or Flash memory write cycles. IC Role / Device Role / Timing Role: Precision 12V generator triggered only during memory programming, minimizing standby power. Use Value: Fixed 12.00V output ensures reliable memory programming across temperature; no calibration required. |
| Laptop and Palmtop Computers | Battery Backup Supplies |
Use Scenario: Auxiliary power rail in portable computing devices for LCD bias, audio amplifiers, or USB peripheral interfaces. IC Role / Device Role / Timing Role: Dual-mode regulator operating in step-down from 19V main rail or step-up from 3.3V standby rail. Use Value: Single IC replaces multiple regulators; 72kHz frequency avoids audible noise in sensitive analog sections. | Use Scenario: Real-time clock (RTC) backup circuit maintaining SRAM or timekeeping during main power loss. IC Role / Device Role / Timing Role: Low-quiescent-current boost converter sustaining 12V rail from depleted 3V coin cell. Use Value: 300µA shutdown current enables >5-year coin cell life; built-in low-battery comparator disables output before cell depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1111CN8-12 | DIP-8 package; higher θJA (130°C/W); commercial temp range (0°C to 70°C) identical | Suitable for prototyping or through-hole production; less space-efficient than SO-8 | Select when manual soldering or breadboard evaluation is required |
| LT1111IS8-12 | Same SO-8 package; extended temperature range (–40°C to 105°C); identical electrical specs | Required for automotive under-hood or industrial control cabinet deployments | Choose for harsh-environment reliability; no layout change needed |
Compared with LT1111CN8-12 and LT1111IS8-12, the LT1111CS8-12#TRPBF offers optimal balance of surface-mount efficiency, commercial-grade cost, and proven 12V regulation stability-making it ideal for high-volume portable electronics where board space and assembly cost are critical.
Availability
LT1111CS8-12#TRPBF is available at Aetrix Electronics and suitable for remote controls, flash memory VPP generation, and battery backup supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1111CS8-12#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 technical and manufacturing continuity for the LT® product family.
The LT1111 product line was designed for ultra-low-power, multi-topology DC/DC conversion in space-constrained portable and battery-operated systems-emphasizing micropower operation, minimal external components, and flexible voltage transformation.
FAQ
What is the output voltage tolerance of the LT1111CS8-12#TRPBF?
The LT1111CS8-12#TRPBF provides a fixed 12V output with guaranteed tolerance of ±5% (11.4V to 12.6V) over the full 0°C to 70°C operating temperature range and input voltage variations. This specification is ensured by laser-trimmed internal resistor dividers and applies without any external components.
Can the LT1111CS8-12#TRPBF operate in step-down mode?
Yes, the LT1111CS8-12#TRPBF supports step-down (buck) operation when configured with appropriate external components-specifically, connecting SW1 to VIN and SW2 to the inductor/diode node. It regulates 12V output from inputs up to 30V, with verified performance at 12V input delivering 200mA.
What is the purpose of the ILIM pin on the LT1111CS8-12#TRPBF?
The ILIM pin on the LT1111CS8-12#TRPBF enables programmable current limiting by connecting an external resistor between ILIM and VIN. For example, a 220Ω resistor limits peak switch current to ~400mA, protecting the internal 1.5A NPN switch and preventing inductor saturation during input voltage transients.
Does the LT1111CS8-12#TRPBF require an external feedback resistor network?
No-the LT1111CS8-12#TRPBF does not require external feedback resistors. Its FB/SENSE pin (Pin 8) connects directly to the 12V output and interfaces with factory-trimmed internal resistors that set the regulated output precisely to 12.00V, eliminating design iteration and calibration effort.
What type of diode should be used with the LT1111CS8-12#TRPBF in boost mode?
A Schottky diode such as the MBRS130T3 or 1N5818 is required for LT1111CS8-12#TRPBF boost operation. These diodes provide low forward voltage (~0.5V at 1A), fast recovery, and low leakage (<10µA), ensuring high efficiency and preventing destructive negative voltage excursions at the SW2 pin.
LT1111CS8-12#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:
- 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:
- 72kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1111CS8-12#TRPBF FAQ
1.How can I place an order for LT1111CS8-12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1111CS8-12#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 LT1111CS8-12#TRPBF reliable?
The price and inventory of LT1111CS8-12#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1111CS8-12#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1111CS8-12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1111CS8-12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1111CS8-12#TRPBF?
LT1111CS8-12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1111CS8-12#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 LT1111CS8-12#TRPBF?
For technical support, including LT1111CS8-12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1111CS8-12#TRPBF requirements.
6.How does Aetrix verify that LT1111CS8-12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1111CS8-12#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 LT1111CS8-12#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1111CS8-12#TRPBF?
All LT1111CS8-12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1111CS8-12#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 LT1111CS8-12#TRPBF part is unused and in its original packaging.
Return procedure for LT1111CS8-12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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