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Analog Devices Inc. LT1107CN8
- Part No.:
- LT1107CN8
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1107CN8.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,100
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Product details
Overview
LT1107CN8 from Linear Technology is a micropower DC/DC converter IC supporting step-up, step-down, and inverting topologies with fixed 5V or 12V output options (this variant is adjustable). It operates from 2V to 30V input, delivers up to 300mA in step-down mode, consumes only 320µA quiescent current, and integrates a 1A internal power switch and on-chip low-battery detector. It is used in palmtop computers and battery backup supplies.
For engineers reviewing the LT1107CN8 datasheet, LT1107CN8 pinout, LT1107CN8 application, or LT1107CN8 equivalent, key selection criteria include its 63kHz oscillator frequency, 70% duty cycle in step-up mode, programmable current limit via ILIM pin, 8-pin PDIP package, and compatibility with surface-mount inductors and Schottky diodes.
Technical Context
The LT1107CN8 implements a gated-oscillator architecture where the 63kHz internal oscillator activates only when the feedback voltage falls below the 1.25V reference, enabling ultra-low 320µA quiescent current. Its internal NPN power switch supports both step-up (SW1 drives inductor, SW2 grounded) and step-down (SW1 tied to VIN, SW2 drives inductor) configurations.
Current limiting is achieved by sensing ~0.5% of switch current through an internal ratioed transistor and external resistor between ILIM and VIN; propagation delay is ~800ns. The auxiliary gain block (SET/AO pins) functions as a configurable op-amp for low-battery detection or ripple reduction, with 1.25V reference tied to its negative input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V–30V: supports wide-input battery systems (2AA cells to 24V rails) |
| Quiescent Current | 320µA: enables multi-year operation on coin-cell or AA batteries |
| Oscillator Frequency | 63kHz typical: optimized for cost-effective surface-mount inductors (e.g., 33µH) |
| Duty Cycle (Step-Up) | 70% typical: increases available output current vs. LT1111 (60%) |
| Internal Switch Rating | 1A max: eliminates need for external MOSFET in ≤300mA step-down designs |
| Output Voltage Sense | 1.25V reference: enables precise adjustable output using external resistor divider |
| Operating Temp Range | 0°C to 70°C: suitable for commercial-grade portable electronics |
Pinout & Package
LT1107CN8 uses an 8-lead plastic DIP (N8) package with 0.300-inch width, lead pitch 0.100 inch, and JEDEC MS-001 compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (1) | Current Limit Programming Input | Resistor to VIN sets peak switch current (e.g., 220Ω → ~400mA); tie directly to VIN for no limit |
| VIN (2) | Main Power Input | Supplies operating power; accepts 2V–30V; powers internal oscillator and driver |
| SW1 (3) | Switch Collector | In step-up: connects to inductor/diode; in step-down: connects to VIN rail |
| SW2 (4) | Switch Emitter | In step-up: connects to GND; in step-down: connects to inductor/load; must not go < –0.5V |
| GND (5) | Analog/Digital Ground | Common return for feedback, gain block, and switch emitter path |
| AO (6) | Auxiliary Gain Block Output | Open-collector output sinking up to 300µA; used for low-battery flag or error amplification |
| SET (7) | Gain Block Non-Inverting Input | Accepts external voltage divider for comparator trip point; referenced to internal 1.25V |
| FB/SENSE (8) | Feedback Input / Voltage Sense | Compares against 1.25V reference to regulate output; in fixed versions, connects to output |
Key Features
| Feature | Design Value |
|---|---|
| Three-Component Operation | Only inductor, diode, and output capacitor required for basic 5V/12V conversion |
| Programmable Current Limit | Single external resistor sets switch current threshold, preventing inductor saturation across wide VIN ranges |
| On-Chip Low-Battery Detector | Gain block + resistor divider provides accurate, user-adjustable undervoltage lockout without extra ICs |
| Multi-Topology Support | Same IC supports boost, buck, and inverting configurations via pin reconnection-reduces BOM count |
| 63kHz Optimized Oscillator | Enables use of small, low-cost surface-mount inductors (e.g., Sumida CD54-330K) and avoids EMI-sensitive bands |
Applications
| Palmtop Computer Logic Supply | 3V-to-5V Battery-Powered Converter |
|---|---|
Use Scenario: Generating stable 5V logic supply from two alkaline AA cells (2.0–3.2V) in handheld computing devices. IC Role / Device Role / Timing Role: Adjustable DC/DC converter operating in step-up mode with 63kHz switching and 70% duty cycle. Use Value: Delivers 150mA at 5V from 2AA input while consuming only 320µA quiescent current-extending battery life. | Use Scenario: Converting 3.3V system rail to 5V for USB peripherals or legacy I/O in portable instrumentation. IC Role / Device Role / Timing Role: Step-up regulator with programmable current limit and integrated 1A switch. Use Value: Eliminates need for external MOSFET and reduces component count to three passive parts-cutting PCB area and cost. |
| 24V-to-5V Industrial Sensor Interface | LCD Bias Generator |
Use Scenario: Deriving regulated 5V from 24V industrial bus for microcontroller and analog front-end in field sensors. IC Role / Device Role / Timing Role: Step-down converter with 30V max input rating and internal 1A switch. Use Value: Supports full 24V input range without derating; delivers 300mA at 5V with <1.5V switch saturation drop. | Use Scenario: Generating ±10V bias voltages for monochrome LCD panels in medical handhelds. IC Role / Device Role / Timing Role: Inverting configuration (positive-to-negative) using SW1/SW2 reconfiguration. Use Value: Single IC replaces dual converters; Schottky-diode-coupled topology ensures fast transient response and low ripple. |
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 | Same pinout, but 60% max duty cycle and higher quiescent current (500µA) | Lower output current capability in step-up mode; less efficient at low VIN | Choose LT1107CN8 when >150mA output at 2–3V input is required |
| MAX630CPA+ | 5V fixed output only; no adjustable version; 120kHz oscillator; 350µA IQ | Lacks step-down/inverting modes; requires different inductor values | Choose LT1107CN8 when topology flexibility (boost/buck/invert) or adjustable VOUT is needed |
Compared with LT1111CN8 and MAX630CPA+, the LT1107CN8 offers superior step-up current delivery at low input voltage due to its 70% duty cycle and lower 320µA quiescent current, while retaining full multi-topology support and adjustable output-making it optimal for space-constrained, battery-sensitive designs requiring design reuse across voltage domains.
Availability
LT1107CN8 is available at Aetrix Electronics and suitable for palmtop computers, battery backup supplies, and portable instrumentation requiring stable component supply with long-lifecycle support.
Supply support for LT1107CN8 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
Linear Technology Corporation (now part of Analog Devices) designs high-performance analog ICs for precision power, signal conditioning, and interface applications.
The LT1107CN8 belongs to Linear's micropower DC/DC converter product line, engineered for ultra-low-quiescent-current operation in battery-powered portable systems where efficiency and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the LT1107CN8?
The LT1107CN8 has an absolute maximum supply voltage (VIN) rating of 36V. However, its specified operational input range is 2V to 30V - with 2V–12.6V valid in step-up mode and up to 30V in step-down mode. Exceeding 30V during normal operation risks violating the guaranteed performance envelope, though the 36V absolute maximum provides margin against transients.
Can the LT1107CN8 be used in step-down (buck) configuration?
Yes, the LT1107CN8 supports step-down operation: connect SW1 to VIN, SW2 to the inductor, and ground the FB/SENSE pin through a resistor divider. It delivers up to 300mA at 5V from 24V input with 1.5V typical switch saturation drop. Output voltage must be ≤6.2V unless a Schottky diode is added in series with SW2.
How does the ILIM pin function on the LT1107CN8?
The ILIM pin on the LT1107CN8 allows programming of peak switch current using a single resistor to VIN. A 220Ω resistor limits current to ~400mA. Internally, ~0.5% of switch current flows through an 80Ω sense resistor; when the resulting voltage across ILIM+RLIM reaches ~0.6V, the switch terminates early. This prevents inductor saturation across wide input ranges.
What is the purpose of the AO and SET pins on the LT1107CN8?
The AO (open-collector output) and SET (non-inverting input) pins form a dedicated auxiliary gain block referenced to the internal 1.25V bandgap. This block can be configured as a low-battery detector (via resistor divider on SET), linear post-regulator, or error amplifier to reduce output ripple - all without adding external op-amps or comparators.
Is the LT1107CN8 pin-compatible with other members of the LT1107 family?
Yes, the LT1107CN8 is pin-compatible with all variants in the LT1107 family including LT1107CN8-5, LT1107CN8-12, and LT1107CS8. Differences lie in output voltage configuration (adjustable vs. fixed 5V/12V) and package (PDIP vs. SO-8), but pin functions, electrical behavior, and PCB layout remain identical across N8-packaged versions.
LT1107CN8 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 50V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 63kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1107CN8 FAQ
1.How can I place an order for LT1107CN8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107CN8 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 reliable?
The price and inventory of LT1107CN8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107CN8 is usually 5 days.
3.What payment methods are accepted for LT1107CN8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107CN8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107CN8?
LT1107CN8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107CN8 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?
For technical support, including LT1107CN8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107CN8 requirements.
6.How does Aetrix verify that LT1107CN8 is sourced from the original manufacturer or authorized distributors?
All LT1107CN8 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 meets industry standards.
7.What is the process for return or replacement of LT1107CN8?
All LT1107CN8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1107CN8, 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 part is unused and in its original packaging.
Return procedure for LT1107CN8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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