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Analog Devices Inc. LT1107CN8-5#PBF
- Part No.:
- LT1107CN8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1107CN8-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,725
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Product details
Overview
LT1107CN8-5#PBF from Analog Devices (formerly Linear Technology) is a fixed-output 5V 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, user-adjustable current limit via ILIM pin, and operates from 2V to 30V input. It delivers up to 300mA at 5V from 24V input in step-down mode and is used in battery backup supplies and portable instruments.
For engineers reviewing the LT1107CN8-5#PBF datasheet, LT1107CN8-5#PBF pinout, LT1107CN8-5#PBF application, or LT1107CN8-5#PBF equivalent, key selection criteria include input voltage range (2–30V), output regulation accuracy (±5% over temperature), duty cycle behavior (64–76% in step-up), thermal limits (0°C to 70°C), and compatibility with Schottky diodes and surface-mount inductors.
Technical Context
The LT1107CN8-5#PBF implements a gated-oscillator architecture with a 1.25V internal reference and comparator-based feedback control. Its 63kHz oscillator drives an NPN power switch with programmable current limit and 70% typical duty cycle in step-up mode, enabling continuous conduction in many configurations.
It integrates an auxiliary gain block (AO/SET pins) usable as low-battery detector or error amplifier, and supports three topologies: boost (VIN < VOUT), buck (VIN > VOUT), and inverting (positive-to-negative). Pin 8 (FB/SENSE) connects directly to output for fixed 5V regulation without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±5% over full temperature range - ensures stable logic supply for 3V/5V systems without external feedback network. |
| Input Voltage Range | 2V to 12V (step-up), 30V (step-down) - supports single-cell alkaline (2×AA) and industrial 24V rails in one design. |
| Quiescent Current | 320µA (typical, no load) - enables multi-year battery life in low-duty-cycle portable instrumentation. |
| Oscillator Frequency | 63kHz (typical) - optimized for cost-effective surface-mount inductors (e.g., 33µH) and ceramic capacitors. |
| Switch Current Limit | Programmable up to 1.5A via ILIM-to-VIN resistor - prevents inductor saturation and switch overstress across wide VIN ranges. |
| Operating Temperature | 0°C to 70°C (commercial grade) - suitable for consumer and industrial embedded applications without extended thermal qualification. |
| Package | 8-pin PDIP (N8) - through-hole mounting compatible with legacy PCB assembly and prototyping. |
Pinout & Package
8-pin plastic DIP (N8) package with 0.300-inch width, lead pitch 0.100 inch, RoHS-compliant #PBF finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ILIM) | Current limit programming input | Connect to VIN directly for max current; add resistor to VIN to set precise switch current limit (e.g., 220Ω → ~400mA). |
| 2 (VIN) | Main power input | Accepts 2V–30V; powers internal circuitry and switch driver; must be bypassed with ≥10µF capacitor. |
| 3 (SW1) | Power switch collector | In step-up: connects to inductor/diode node; in step-down: tied to VIN - defines high-side switching path. |
| 4 (SW2) | Power switch emitter | In step-up: grounded; in step-down: connects to inductor/diode node - defines low-side switching path; must not go below –0.5V. |
| 5 (GND) | Analog and power ground | Common return for feedback, oscillator, and switch; requires low-impedance connection to minimize noise coupling. |
| 6 (AO) | Auxiliary gain block open-collector output | Sinks up to 300µA; used for low-battery detection, post-regulation, or ripple reduction when configured with external pull-up. |
| 7 (SET) | Gain block non-inverting input | Accepts resistor divider from VIN to configure trip point for comparator functions (e.g., undervoltage lockout). |
| 8 (FB/SENSE) | Feedback input / fixed-voltage sense | On LT1107CN8-5#PBF: internally connected to 5V divider - connect directly to regulated 5V output for closed-loop control. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 320µA quiescent current enables >5-year battery life in intermittent-use devices like handheld meters. |
| Three-topology flexibility | Single IC supports boost (2V→5V), buck (24V→5V), and inverting (5V→–5V) - reduces BOM count and design cycle time. |
| Integrated 1A power switch | Eliminates need for external transistor and gate driver - simplifies layout and improves reliability in space-constrained designs. |
| User-programmable current limit | Resistor-based ILIM interface allows precise peak-current control to match inductor saturation and thermal limits. |
| On-chip low-battery detector | Gain block (AO/SET) provides configurable undervoltage warning without adding discrete comparators or references. |
Applications
| Palmtop Computer Logic Supply | Battery Backup Supply |
|---|---|
Use Scenario: Generating stable 5V logic rail from two AA alkaline cells (2.0–3.2V) in handheld computing devices. IC Role / Device Role / Timing Role: Micropower DC/DC converter operating in step-up mode with gated oscillator control and internal 5V feedback divider. Use Value: Delivers 150mA at 5V with 320µA quiescent current, extending battery life beyond 100 hours under typical usage. | Use Scenario: Providing regulated 5V standby power during main supply failure in industrial controllers or telecom line cards. IC Role / Device Role / Timing Role: Step-down converter accepting 12–24V primary rail and delivering fault-tolerant 5V output with built-in current limiting. Use Value: Maintains clean 5V output even during brownout conditions; ILIM pin prevents overcurrent damage during capacitor recharge transients. |
| 3V-to-5V Peripheral Converter | LCD Bias Generator |
Use Scenario: Powering 5V USB peripherals or add-on cards from 3V system buses in embedded systems. IC Role / Device Role / Timing Role: Fixed-output boost converter with 63kHz switching frequency and minimal external component count (3 parts). Use Value: Achieves >76% efficiency at 100mA load, reducing heat buildup in compact enclosures without heatsinking. | Use Scenario: Generating negative bias voltage (e.g., –5V) for LCD segment drivers in portable instrumentation. IC Role / Device Role / Timing Role: Inverting configuration using internal switch and Schottky diode, with AO pin enabling display contrast control via gain block. Use Value: Eliminates need for separate charge-pump IC; output ripple reduced to <5mV using gain-block feedback technique. |
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 |
|---|---|---|---|
| LT1111CN8-5#PBF | Pin-for-pin compatible but 50% duty cycle; lower max output current (100mA vs 300mA in buck mode); higher quiescent current (500µA). | Less suitable for high-current step-down applications; better for ultra-low-noise step-up where lower duty cycle reduces EMI. | Select LT1111CN8-5#PBF only when lower switching frequency harmonics or legacy design reuse is required. |
| TPS61200DRCT | Higher efficiency (90%+), 1.2MHz switching, integrated diode, but requires external compensation and lacks on-chip gain block. | Superior for space-constrained, high-efficiency apps; unsuitable where low-battery detection or ripple reduction via AO/SET is needed. | Choose TPS61200DRCT for new designs prioritizing size and efficiency; retain LT1107CN8-5#PBF when analog feature integration (AO/SET/ILIM) is critical. |
Compared with LT1111CN8-5#PBF and TPS61200DRCT, the LT1107CN8-5#PBF uniquely combines micropower operation, topology flexibility, and integrated analog functions (gain block, current limit, comparator) in a through-hole package-making it optimal for legacy-compatible, feature-rich, low-volume industrial designs where layout simplicity and functional integration outweigh raw efficiency gains.
Availability
LT1107CN8-5#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial backup supplies, and portable computing peripherals requiring stable component supply and long-term manufacturability.
Supply support for LT1107CN8-5#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 support for its precision analog and power management portfolio.
The LT1107CN8-5#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-conscious applications demanding multi-topology flexibility, low quiescent current, and integrated analog supervision functions.
FAQ
What is the maximum output current capability of the LT1107CN8-5#PBF in step-down mode?
The LT1107CN8-5#PBF delivers up to 300mA at 5V from a 24V input in step-down mode, as confirmed in the Typical Applications section. Peak switch current is limited to 1.5A internally, but practical output depends on thermal dissipation, inductor selection, and input voltage. At 12V input, sustained output is ~150mA with proper layout and cooling.
Can the LT1107CN8-5#PBF be used in inverting (positive-to-negative) configurations?
Yes, the LT1107CN8-5#PBF supports inverting operation per Figure 3 in the datasheet. It generates regulated negative outputs (e.g., –5V) from positive inputs using standard external components. The FB/SENSE pin connects to the negative output via a resistor divider referenced to ground, and SW2 serves as the switching node. Schottky diodes are mandatory.
Does the LT1107CN8-5#PBF require external feedback resistors to regulate 5V output?
No. The LT1107CN8-5#PBF has internal resistor dividers that fix the output to 5V. Pin 8 (FB/SENSE) must be connected directly to the regulated 5V output node - no external resistors are needed, unlike the adjustable LT1107 version.
What is the purpose of the AO and SET pins on the LT1107CN8-5#PBF?
The AO (pin 6) and SET (pin 7) pins form an auxiliary gain block: SET is the non-inverting input referenced to 1.25V, and AO is an open-collector output sinking up to 300µA. This block can implement low-battery detection, linear post-regulation, or output ripple reduction - all without adding external op-amps or comparators.
Is the LT1107CN8-5#PBF RoHS compliant and lead-free?
Yes. The "#PBF" suffix explicitly denotes lead-free, RoHS-compliant packaging. The device uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), suitable for standard reflow and wave soldering processes.
LT1107CN8-5#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):
- 5V
- 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
LT1107CN8-5#PBF FAQ
1.How can I place an order for LT1107CN8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107CN8-5#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 LT1107CN8-5#PBF reliable?
The price and inventory of LT1107CN8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107CN8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1107CN8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107CN8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107CN8-5#PBF?
LT1107CN8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107CN8-5#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 LT1107CN8-5#PBF?
For technical support, including LT1107CN8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107CN8-5#PBF requirements.
6.How does Aetrix verify that LT1107CN8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1107CN8-5#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 LT1107CN8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1107CN8-5#PBF?
All LT1107CN8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1107CN8-5#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 LT1107CN8-5#PBF part is unused and in its original packaging.
Return procedure for LT1107CN8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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