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Analog Devices Inc. LT1107IS8#PBF
- Part No.:
- LT1107IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1107IS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:428
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Product details
Overview
LT1107IS8#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 detector - enabling compact, battery-efficient power supplies for portable instrumentation and palmtop computers.
For engineers reviewing the LT1107IS8#PBF datasheet, LT1107IS8#PBF pinout, LT1107IS8#PBF application, or LT1107IS8#PBF equivalent, key selection considerations include input voltage range (2V–30V), duty cycle (70% in step-up mode), switch current limit programmability via ILIM pin, thermal rating (–45°C to 85°C), and SO-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LT1107IS8#PBF implements a gated-oscillator architecture where the 63kHz oscillator activates only when feedback voltage falls below 1.25V reference, minimizing quiescent current. Its NPN power switch operates with 0.65V saturation voltage at 650mA in step-up mode and supports user-programmable current limiting via external resistor on ILIM pin.
It integrates an auxiliary gain block (AO/SET pins) configurable as low-battery detector or error amplifier, and uses internal resistive feedback for fixed-output versions (LT1107-5/LT1107-12) while the base LT1107 variant requires external resistor divider on FB/SENSE pin for adjustable output regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 320µA (enables >1-year battery life in low-duty-cycle portable devices) |
| Oscillator Frequency | 63kHz typical (optimized for surface-mount inductors and minimal EMI) |
| Input Voltage Range | 2V–12V (step-up), 3V–30V (step-down) (supports single-cell alkaline to industrial 24V rails) |
| Output Voltage Options | Adjustable (via FB/SENSE), or fixed 5V/12V (reduces BOM count and layout complexity) |
| Switch Current Limit | Programmable up to 1.5A (prevents inductor saturation and switch overcurrent during VIN transients) |
| Operating Temperature | –45°C to +85°C (qualified for extended industrial environments) |
| Duty Cycle | 70% in step-up mode (increases available output current vs LT1111) |
Pinout & Package
LT1107IS8#PBF is housed in an 8-lead plastic SOIC (SO-8, narrow 0.150") package with standard JEDEC MS-012AC footprint and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current Limit Programming Input | Resistor between ILIM and VIN sets peak switch current; open or tied to VIN disables limit |
| VIN (Pin 2) | Main Power Input | Accepts 2V–30V; powers internal circuitry and switch driver |
| SW1 (Pin 3) | Power Switch Collector | In step-up: connects to inductor/diode; in step-down: connects to VIN |
| SW2 (Pin 4) | Power Switch Emitter | In step-up: grounded; in step-down: drives inductor; must not fall below –0.5V |
| GND (Pin 5) | Analog/Digital Ground Reference | Common return for feedback, gain block, and oscillator circuits |
| AO (Pin 6) | Auxiliary Gain Block Output | Open-collector output sinking up to 300µA; used for low-battery flag or post-regulation |
| SET (Pin 7) | Gain Block Non-Inverting Input | Connects to resistor divider for low-battery detection threshold or error amplifier reference |
| FB/SENSE (Pin 8) | Feedback Input / Output Sense | For LT1107: comparator input; for LT1107-5/-12: connects to internal voltage divider |
Key Features
| Feature | Design Value |
|---|---|
| Three-external-component operation | Reduces bill-of-materials and board area vs multi-chip solutions |
| On-chip low-battery detector comparator | 1.25V reference with 12.5mV hysteresis enables reliable system shutdown at defined VBAT |
| User-adjustable current limit | Prevents switch overcurrent and inductor saturation across wide input voltage ranges |
| Internal 1A NPN power switch | Eliminates need for external transistor in most ≤300mA applications |
| 63kHz fixed-frequency oscillator | Enables predictable EMI filtering and consistent inductor sizing |
Applications
| Palmtop Computer Logic Supply | 24V-to-5V Industrial Converter |
|---|---|
Use Scenario: Generating stable 5V logic rail from two AA alkaline cells (2V–3V) in handheld computing devices. IC Role / Device Role / Timing Role: Step-up DC/DC controller with integrated switch and feedback comparator. Use Value: 320µA quiescent current extends battery life; 70% duty cycle delivers 150mA at 5V from 2AA cells. | Use Scenario: Converting 24V industrial bus to regulated 5V for microcontroller peripherals. IC Role / Device Role / Timing Role: Step-down regulator with internal 1A switch and programmable current limit. Use Value: Supports 300mA output at 5V from 24V input; ILIM pin prevents overcurrent during load transients. |
| LCD Bias Generator | Battery Backup Supply |
Use Scenario: Generating ±12V bias voltages for monochrome LCD panels in portable test equipment. IC Role / Device Role / Timing Role: Inverting topology controller using SW1/SW2 pins to drive charge-pump-like inductor configuration. Use Value: Fixed 12V version (LT1107-12) simplifies design; Schottky diode requirement ensures low-loss negative rail generation. | Use Scenario: Providing fail-safe 5V backup to real-time clock and SRAM during main power loss. IC Role / Device Role / Timing Role: Micropower step-up converter activated by low-battery detector (AO/SET pins). Use Value: Auxiliary gain block acts as undervoltage lockout; 320µA IQ minimizes drain on backup coin cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1174CS8-5#PBF | Higher 1.4MHz switching frequency; lower 100µA IQ; no integrated current limit programming | Better suited for ultra-low-noise, high-density designs requiring smaller magnetics | Select when board space is critical and input range is limited to 2.7V–10V |
| MAX761CSA+T | Fixed 5V output only; 100µA IQ; 300kHz oscillator; no auxiliary gain block | Simpler implementation for dedicated 5V step-up, but lacks configurability and monitoring features | Select when cost and design simplicity outweigh need for adjustable output or low-battery detection |
Compared with LTC1174CS8-5#PBF and MAX761CSA+T, the LT1107IS8#PBF offers broader input range (2V–30V), programmable current limiting, and integrated gain block for system monitoring - making it optimal for rugged, multi-mode portable power systems where flexibility and reliability are prioritized over minimum footprint.
Availability
LT1107IS8#PBF is available at Aetrix Electronics and suitable for palmtop computers, industrial 24V-to-5V converters, LCD bias generators, and battery backup supplies requiring stable component supply across extended temperature ranges.
Supply support for LT1107IS8#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 product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1107 series.
The LT1107IS8#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-operated and space-constrained applications demanding high efficiency at light loads and flexible topology support (boost/buck/inverting).
FAQ
What is the maximum input voltage rating for the LT1107IS8#PBF?
The LT1107IS8#PBF has an absolute maximum supply voltage (VIN) rating of 36V. However, its functional step-up operating range is specified from 2V to 12.6V, and step-down operation supports inputs up to 30V. Exceeding 30V in step-down mode risks exceeding internal power dissipation limits and should be avoided in sustained operation.
Does the LT1107IS8#PBF require external components to regulate output voltage?
Yes - the base LT1107IS8#PBF requires two external resistors (R1, R2) on the FB/SENSE pin to set the output voltage using the formula VOUT = 1.25V × (1 + R1/R2). Fixed-output variants (e.g., LT1107IS8-5#PBF) integrate these resistors and need no external feedback network.
Can the LT1107IS8#PBF operate in inverting (positive-to-negative) configuration?
Yes - the LT1107IS8#PBF supports inverting topology by connecting SW2 to the output capacitor and SW1 to ground, with the feedback referenced to ground. This configuration generates negative output voltages up to –6.2V; higher magnitudes require additional diode isolation per datasheet Figure 3.
What is the purpose of the AO and SET pins on the LT1107IS8#PBF?
The AO (pin 6) and SET (pin 7) pins form an auxiliary PNP-input op amp. SET is the non-inverting input tied to an internal 1.25V reference; AO is an open-collector output sinking up to 300µA. Together they enable low-battery detection, linear post-regulation, or undervoltage lockout without external amplifiers.
Is the LT1107IS8#PBF pin-compatible with other Linear DC/DC controllers?
Yes - the LT1107IS8#PBF is pin-for-pin compatible with the LT1111 in the same SO-8 package. However, the LT1107IS8#PBF uses a 70% duty cycle versus the LT1111's 50%, delivering higher output current in step-up applications without layout changes.
LT1107IS8#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:
- -45°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1107IS8#PBF FAQ
1.How can I place an order for LT1107IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107IS8#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 LT1107IS8#PBF reliable?
The price and inventory of LT1107IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1107IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107IS8#PBF?
LT1107IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107IS8#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 LT1107IS8#PBF?
For technical support, including LT1107IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107IS8#PBF requirements.
6.How does Aetrix verify that LT1107IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1107IS8#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 LT1107IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1107IS8#PBF?
All LT1107IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1107IS8#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 LT1107IS8#PBF part is unused and in its original packaging.
Return procedure for LT1107IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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