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Analog Devices Inc. LT1107CN8-12#PBF
- Part No.:
- LT1107CN8-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1107CN8-12#PBF.pdf
- Description:
- IC REG BUCK BOOST 12V 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,225
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Product details
Overview
LT1107CN8-12#PBF from Analog Devices (formerly Linear Technology) is a fixed-output 12V micropower DC/DC converter IC operating in step-up, step-down, or inverting modes. It features 320µA quiescent current, internal 1A power switch, 63kHz oscillator, on-chip low-battery detector comparator, and user-adjustable current limit. It delivers up to 300mA at 12V from 24V input in step-down mode and powers battery-backed peripherals requiring stable 12V rails.
For engineers reviewing the LT1107CN8-12#PBF datasheet, LT1107CN8-12#PBF pinout, LT1107CN8-12#PBF application, or LT1107CN8-12#PBF equivalent, key selection considerations include its 2V–30V input range, fixed 12V ±2.5% output accuracy over temperature, 70% duty cycle in step-up mode, 8-pin PDIP package with GND-referenced SW2 pin, and compatibility with Schottky diodes for efficient inductor-based topologies.
Technical Context
The LT1107CN8-12#PBF implements a gated-oscillator architecture with a 1.25V internal reference and comparator-controlled switching. Its oscillator operates 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 with 0.65V saturation voltage at 650mA (step-down), programmable current limit via ILIM pin, and auxiliary gain block (AO/SET pins) configurable as low-battery detector or error amplifier. Pin 8 (FB/SENSE) connects directly to output for fixed 12V regulation without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2.5% (11.4V–12.6V) over 0°C–70°C, ensuring stable rail for analog circuitry and logic interfaces |
| Input Voltage Range | 2V–12.6V (step-up), 30V max (step-down), supporting single-cell alkaline to industrial 24V bus inputs |
| Quiescent Current | 320µA typical (switch OFF), enabling >1-year battery life in low-duty-cycle portable instruments |
| Oscillator Frequency | 63kHz typical, optimized for surface-mount inductors and minimizing EMI in space-constrained designs |
| Switch Current Limit | Programmable up to 1.5A via ILIM resistor; default ~400mA with 220Ω, preventing inductor saturation during VIN transients |
| Duty Cycle | 70% in step-up mode, increasing available output current versus 50% competitors like LT1111 |
| Operating Temperature | 0°C to 70°C (commercial grade), validated for use in consumer electronics and industrial control panels |
Pinout & Package
LT1107CN8-12#PBF uses an 8-lead plastic DIP (N8) package with 0.300-inch width, lead pitch 0.100 inch, and through-hole mounting. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (1) | Current limit programming input | Connect to VIN for full 1.5A switch rating; add resistor to VIN to reduce peak current and prevent inductor saturation |
| VIN (2) | Main power supply input | Accepts 2V–30V; supplies internal oscillator, comparator, and driver circuits; must be bypassed with ≥10µF capacitor |
| SW1 (3) | Collector of internal NPN power switch | In step-up: drives inductor/diode node; in step-down: connected to input rail; withstands 50V transient |
| SW2 (4) | Emitter of internal NPN power switch | In step-up: grounded; in step-down: drives inductor/diode node; must not fall below –0.5V (Schottky diode required) |
| GND (5) | Analog and power ground reference | Common return for feedback, oscillator, and switch; requires low-impedance PCB connection to minimize noise |
| AO (6) | Open-collector auxiliary gain block output | Sinks 300µA; used for low-battery detection, undervoltage lockout, or ripple reduction when configured with SET pin |
| SET (7) | Positive input of auxiliary gain block | Connected to resistor divider from VIN for trip-point setting; internal 1.25V reference is negative input |
| FB/SENSE (8) | Feedback input (fixed 12V version) | Internally connected to 12V divider; tie directly to output for regulation; no external resistors needed |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 320µA quiescent current enables multi-year battery life in handheld test equipment and remote sensors |
| Three-component topology | Requires only inductor, diode, and output capacitor-reducing BOM cost and PCB area vs. controller+MOSFET solutions |
| On-chip low-battery comparator | 1.25V reference with 12.5mV hysteresis allows precise undervoltage detection without external comparators |
| Configurable topology support | Single IC supports boost (2V→12V), buck (24V→12V), and inverting (5V→–12V) with minimal component changes |
| Thermal-limited current protection | Current limit temperature coefficient of –0.3%/°C maintains safe switch operation across 0°C–70°C ambient |
Applications
| Palmtop Computer Logic Supply | 24V to 12V Industrial Converter |
|---|---|
Use Scenario: Powering 12V LCD bias and SRAM backup in handheld computing devices powered by dual AA cells. IC Role / Device Role / Timing Role: Micropower DC/DC converter providing regulated 12V output from 2–3V alkaline input in step-up mode. Use Value: 320µA quiescent current extends battery life beyond 18 months in standby; 70% duty cycle enables 150mA output at 2V input. | Use Scenario: Generating clean 12V rail from 24V factory automation bus for analog sensor signal conditioning. IC Role / Device Role / Timing Role: Step-down regulator converting 24V industrial supply to isolated 12V logic rail with minimal heat dissipation. Use Value: Delivers 300mA at 12V with <1.5V switch saturation drop, reducing thermal load versus linear regulators. |
| LCD Bias Generator | Battery Backup Supply |
Use Scenario: Generating high-voltage bias for STN LCD displays in medical handhelds using single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Boost converter stepping 3.7V to 12V with 63kHz switching frequency compatible with compact SMD inductors. Use Value: Fixed 12V output eliminates trimming resistors; 50mV output ripple (typical) meets display contrast stability requirements. | Use Scenario: Maintaining real-time clock and SRAM memory during main power failure in telecom base stations. IC Role / Device Role / Timing Role: Standby DC/DC converter activated by AO-driven MOSFET switch when primary supply drops below threshold. Use Value: Auxiliary gain block (SET/AO) provides precise low-battery detection at 3.3V with hysteresis, eliminating external supervisor IC. |
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 |
|---|---|---|---|
| LT1111CN8-12#PBF | Pin-compatible but 50% max duty cycle; lower output current capability in step-up mode | Less suitable for low-input-voltage boost (e.g., 2V→12V); limited to ≤100mA at 2V input | Select LT1107CN8-12#PBF when higher output current from sub-3V sources is required |
| MAX761CSA+T | 5V fixed output only; no 12V variant; 100kHz oscillator; requires external MOSFET in high-current buck | Not usable for 12V generation; lacks integrated 1A switch and low-battery comparator | Choose LT1107CN8-12#PBF for fixed 12V output with integrated switch and system monitoring features |
Compared with LT1111CN8-12#PBF and MAX761CSA+T, the LT1107CN8-12#PBF offers superior step-up current delivery from low VIN, built-in 12V regulation, and integrated system supervision-reducing component count and validation effort in battery-critical designs.
Availability
LT1107CN8-12#PBF is available at Aetrix Electronics and suitable for palmtop computers, 24V-to-12V industrial converters, LCD bias generators, and battery backup supplies requiring stable component supply and long-term obsolescence management.
Supply support for LT1107CN8-12#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 technical and supply chain support for legacy Linear products including the LT1107 family.
The LT1107CN8-12#PBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-operated systems where ultra-low quiescent current, topology flexibility, and integrated supervision functions are critical.
FAQ
What is the maximum input voltage for LT1107CN8-12#PBF in step-down mode?
The LT1107CN8-12#PBF supports up to 30V input in step-down mode, as specified in its Absolute Maximum Ratings. This allows direct use with common industrial 24V rails while maintaining regulation to 12V output. Operation above 30V risks permanent damage to the internal power switch and is strictly prohibited per the datasheet.
Does LT1107CN8-12#PBF require external feedback resistors to set the 12V output?
No, the LT1107CN8-12#PBF does not require external feedback resistors. It integrates precision on-chip resistors to set the 12V output; pin 8 (FB/SENSE) must be connected directly to the output node. This eliminates resistor tolerance errors and simplifies layout versus adjustable versions like the LT1107CN8.
Can LT1107CN8-12#PBF operate in inverting configuration to generate –12V?
Yes, the LT1107CN8-12#PBF can be configured as a positive-to-negative converter delivering –12V output. The datasheet Figure 3 shows the standard hookup using a Schottky diode and inductor. Output magnitude should be limited to ≤6.2V unless modified with external components, but –12V is achievable with proper inductor selection and layout.
What is the purpose of the AO and SET pins on LT1107CN8-12#PBF?
The AO (pin 6) and SET (pin 7) pins form an auxiliary gain block with internal 1.25V reference. AO is an open-collector output sinking 300µA; SET is its positive input. Together they enable low-battery detection, linear post-regulation, or output ripple reduction-adding system-level functionality without external op-amps.
Is LT1107CN8-12#PBF RoHS compliant and lead-free?
Yes, LT1107CN8-12#PBF is RoHS compliant and lead-free. The "#PBF" suffix explicitly denotes lead-free packaging per Analog Devices' standard nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering per IPC/JEDEC J-STD-020.
LT1107CN8-12#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, 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1107CN8-12#PBF FAQ
1.How can I place an order for LT1107CN8-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107CN8-12#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 LT1107CN8-12#PBF reliable?
The price and inventory of LT1107CN8-12#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107CN8-12#PBF is usually 5 days.
3.What payment methods are accepted for LT1107CN8-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107CN8-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107CN8-12#PBF?
LT1107CN8-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107CN8-12#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 LT1107CN8-12#PBF?
For technical support, including LT1107CN8-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107CN8-12#PBF requirements.
6.How does Aetrix verify that LT1107CN8-12#PBF is sourced from the original manufacturer or authorized distributors?
All LT1107CN8-12#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 LT1107CN8-12#PBF meets industry standards.
7.What is the process for return or replacement of LT1107CN8-12#PBF?
All LT1107CN8-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1107CN8-12#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 LT1107CN8-12#PBF part is unused and in its original packaging.
Return procedure for LT1107CN8-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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