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Analog Devices Inc. LT1107CS8#PBF
- Part No.:
- LT1107CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1107CS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:126
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Product details
Overview
LT1107CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower DC/DC converter IC supporting step-up, step-down, and inverting topologies. It features 320µA quiescent current, internal 1A power switch, 63kHz oscillator, adjustable or fixed 5V/12V output, and on-chip low-battery comparator - enabling compact, battery-efficient power supplies for portable instrumentation and palmtop computers.
For engineers reviewing the LT1107CS8#PBF datasheet, LT1107CS8#PBF pinout, LT1107CS8#PBF application, or LT1107CS8#PBF equivalent, key selection considerations include input voltage range (2V–30V), programmable current limit via ILIM pin, SO-8 package thermal performance (θJA = 150°C/W), and compatibility with surface-mount inductors and Schottky diodes in boost/buck configurations.
Technical Context
The LT1107CS8#PBF uses a gated-oscillator architecture with a 1.25V internal reference and comparator-based feedback control. Its 63kHz oscillator delivers 11µs ON time in step-up mode, optimized for VOUT ≈ 3VIN operation. The device integrates an NPN power switch with 0.65Ω typical saturation resistance and supports duty cycle adjustment from 50% to 78% depending on mode and temperature.
It includes dual functional blocks: a main switching regulator core and an auxiliary gain block (AO/SET pins) configurable as low-battery detector, linear post-regulator, or error amplifier. Current limiting is implemented via external resistor between ILIM and VIN, with trip accuracy dependent on ON time (>3µs recommended) and temperature coefficient of –0.3%/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 320µA (enables >1-year battery life in 2xAA-powered systems at light load) |
| Oscillator Frequency | 63kHz typical (optimized for standard surface-mount inductors and capacitors) |
| Input Voltage Range | 2V–12.6V (step-up), up to 30V (step-down) - supports wide-input industrial and battery-sourced rails |
| Output Voltage Options | Adjustable (via FB pin), or fixed 5V ±2.5% / 12V ±2.5% (LT1107CS8-5/LT1107CS8-12 variants) |
| Switch Current Limit | Programmable up to 1.5A (via ILIM-to-VIN resistor); 400mA typical with 220Ω resistor |
| Operating Temperature | 0°C to 70°C (commercial grade, validated for embedded consumer and industrial applications) |
| Package Thermal Resistance | θJA = 150°C/W (SO-8 package enables 500mW max power dissipation at TA = 70°C) |
Pinout & Package
LT1107CS8#PBF is housed in an 8-lead plastic SOIC (SO-8) package, 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012AC compliant. Pin 1 (ILIM) is bottom-left when notch is oriented left; pin 8 (FB/SENSE) is top-right.
| 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 disables limit |
| VIN (Pin 2) | Main supply input | Accepts 2V–30V; powers internal circuitry and switch driver; must be bypassed with ≥1µF ceramic capacitor |
| SW1 (Pin 3) | Power switch collector | In step-up: connects to inductor/diode node; in step-down: connects directly to VIN rail |
| SW2 (Pin 4) | Power switch emitter | In step-up: grounded; in step-down: drives inductor; must not fall below –0.5V (Schottky clamp required) |
| GND (Pin 5) | Analog and power ground | Single-point return for FB, SET, AO, and internal reference; requires low-impedance PCB connection |
| AO (Pin 6) | Auxiliary gain block output | Open-collector NPN output sinking up to 300µA; used for low-battery flag or error amplification |
| SET (Pin 7) | Auxiliary gain block non-inverting input | Accepts resistor divider from VIN to configure comparator trip point (e.g., 1.25V reference + hysteresis) |
| FB/SENSE (Pin 8) | Feedback or fixed-output sense | On LT1107 (adjustable): comparator input; on -5/-12 versions: internal resistor tap for 5V/12V regulation |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 320µA quiescent current enables multi-year battery life in always-on sensor nodes and handheld devices |
| Triple topology support | Single IC implements boost (2V→5V), buck (24V→5V), and inverting (5V→–5V) without external controller changes |
| Integrated current limiting | Resistor-programmable switch current prevents inductor saturation and MOSFET overcurrent in variable-input applications |
| On-chip low-battery detector | Configurable via SET/AO pins to generate system reset or warning at user-defined VIN threshold (e.g., 2.8V) |
| Space-saving SO-8 packaging | 8-pin SOIC footprint reduces board area by >50% vs. DIP alternatives while maintaining thermal performance (θJA = 150°C/W) |
Applications
| Palmtop Computer Logic Supply | 24V to 5V Industrial Converter |
|---|---|
Use Scenario: Generating stable 5V logic rail from two alkaline AA cells (2.0–3.2V) in space-constrained palmtop PCs. IC Role / Device Role / Timing Role: Primary step-up DC/DC converter with integrated 1A switch and 63kHz oscillator driving external inductor/diode. Use Value: Delivers 150mA at 5V with 82% efficiency at 2.5V input - eliminating need for external controller and reducing BOM count by 3 components. | Use Scenario: Converting 24V factory bus to regulated 5V for PLC I/O modules operating in 0°C–70°C ambient. IC Role / Device Role / Timing Role: Step-down (buck) regulator with SW1 tied to 24V, SW2 driving inductor, and GND-referenced feedback loop. Use Value: Supports 300mA output at 5V with <320µA quiescent draw - enabling low-power standby modes without auxiliary LDOs. |
| LCD Bias Generator | Battery Backup Supply |
Use Scenario: Generating ±12V bias voltages for monochrome LCD panels in portable medical instruments. IC Role / Device Role / Timing Role: Inverting configuration (positive-to-negative) using LT1107CS8#PBF with external Schottky diode and 100µH inductor. Use Value: Achieves <6.2V magnitude negative output with built-in SW2 clamping - avoids destructive –0.8V excursions seen with silicon diodes. | Use Scenario: Maintaining real-time clock (RTC) and SRAM backup during main power failure in industrial gateways. IC Role / Device Role / Timing Role: Low-quiescent-current step-up converter charging supercapacitor from 3.3V system rail to 5V backup level. Use Value: 320µA IQ ensures >30-day hold-up time on 0.1F supercapacitor - outperforming discrete charge-pump solutions by 3× runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1111CS8#PBF | Pin-for-pin compatible but 50% duty cycle; lower peak output current capability in step-up mode | Less suitable for high-current boost from low VIN (e.g., 2xAA → 5V @ 150mA) | Select LT1107CS8#PBF when >120mA output at 2V–3V input is required; LT1111 preferred only for legacy designs with fixed 50% duty cycle constraints |
| TPS61040DRVR | Higher 500kHz switching frequency; no integrated current limit; requires external compensation | Better suited for ultra-small form factor (<20mm²) but lacks on-chip comparator for low-battery detection | Choose LT1107CS8#PBF when system-level functions (low-battery flag, programmable current limit, triple topology) outweigh size savings |
Compared with LT1111CS8#PBF and TPS61040DRVR, the LT1107CS8#PBF uniquely combines micropower operation (320µA), integrated current limiting, and triple-mode topology in a single SO-8 package - making it optimal for cost-sensitive, function-rich portable power designs where layout simplicity and feature integration are prioritized over maximum switching frequency.
Availability
LT1107CS8#PBF is available at Aetrix Electronics and suitable for palmtop computer logic supplies, 24V-to-5V industrial converters, LCD bias generators, and battery backup supplies requiring stable component supply across extended production lifecycles.
Supply support for LT1107CS8#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 manufacturing continuity for all Linear power products. Linear was founded in 1981 and pioneered high-performance analog ICs for precision power and signal conditioning.
The LT1107CS8#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-operated and energy-conscious systems requiring high efficiency at light loads, minimal external components, and flexible topology support without sacrificing reliability.
FAQ
What is the maximum input voltage the LT1107CS8#PBF can handle in step-down mode?
The LT1107CS8#PBF supports up to 30V input voltage in step-down (buck) mode, as specified in its Absolute Maximum Ratings. This allows direct use with 24V industrial buses or automotive-derived supplies without pre-regulation. Operation above 30V risks permanent damage to the internal 1A power switch and oscillator circuitry.
Can the LT1107CS8#PBF be used to generate a negative output voltage?
Yes, the LT1107CS8#PBF supports positive-to-negative conversion using its inverting configuration. As shown in Figure 3 of the datasheet, connecting the feedback network to ground and routing SW2 through a Schottky diode enables generation of –5V or –12V outputs. Output magnitude must remain ≤6.2V unless additional clamping is added to prevent SW2 from exceeding –0.5V.
How does the ILIM pin function in the LT1107CS8#PBF, and what resistor value sets 400mA current limit?
The ILIM pin on the LT1107CS8#PBF programs switch current limit by sensing a fraction of the main switch current through an internal 80Ω resistor. A 220Ω external resistor between ILIM and VIN sets the trip point to approximately 400mA, as confirmed in the Electrical Characteristics table. Lower resistance increases current limit; open-circuit or direct tie to VIN disables limiting.
Is the LT1107CS8#PBF RoHS-compliant and lead-free?
Yes, the LT1107CS8#PBF is RoHS-compliant and lead-free. The "#PBF" suffix explicitly denotes lead-free (Pb-free) packaging per Analog Devices' product marking convention. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering up to 260°C peak temperature.
What is the purpose of the AO and SET pins on the LT1107CS8#PBF?
The AO (pin 6) and SET (pin 7) pins implement an auxiliary gain block - a PNP-input op amp with open-collector output. SET serves as the non-inverting input referenced to the internal 1.25V bandgap; AO sinks up to 300µA when the SET voltage exceeds the reference. This block enables low-battery detection, linear post-regulation, or ripple reduction when placed ahead of the FB pin.
LT1107CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1107CS8#PBF FAQ
1.How can I place an order for LT1107CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107CS8#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 LT1107CS8#PBF reliable?
The price and inventory of LT1107CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1107CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107CS8#PBF?
LT1107CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107CS8#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 LT1107CS8#PBF?
For technical support, including LT1107CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107CS8#PBF requirements.
6.How does Aetrix verify that LT1107CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1107CS8#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 LT1107CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1107CS8#PBF?
All LT1107CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1107CS8#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 LT1107CS8#PBF part is unused and in its original packaging.
Return procedure for LT1107CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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