My Inquiry
My Account
Analog Devices Inc. LT1107CS8-5#PBF
- Part No.:
- LT1107CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1107CS8-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:170
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1107CS8-5#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 powers palmtop computer logic supplies.
For engineers reviewing the LT1107CS8-5#PBF datasheet, LT1107CS8-5#PBF pinout, LT1107CS8-5#PBF application, or LT1107CS8-5#PBF equivalent, key selection criteria include input voltage range (2–30V), output accuracy (±2.5% over temperature), low-battery detection capability via AO/SET pins, thermal performance in SO-8 package (θJA = 150°C/W), and compatibility with surface-mount inductors and Schottky diodes.
Technical Context
The LT1107CS8-5#PBF uses 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% duty cycle in step-up mode, enabling continuous conduction in many configurations.
It integrates an auxiliary gain block (AO/SET pins) configurable as low-battery detector, linear post-regulator, or error amplifier, and supports three external-component designs for fixed 5V output. The device requires no external feedback resistors in LT1107CS8-5#PBF configuration due to on-chip voltage-setting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2.5% over 0°C to 70°C temperature range and full load |
| Input Voltage Range | 2V to 12.6V in step-up mode; up to 30V in step-down mode - enables wide-source battery and industrial rail use |
| Quiescent Current | 360µA typical in step-up mode at no load - critical for battery life in portable instruments |
| Oscillator Frequency | 63kHz typical - optimized for standard surface-mount inductors and capacitors without external timing components |
| Switch Current Limit | Programmable up to 1.5A via ILIM-to-VIN resistor - prevents inductor saturation and switch overstress across input variations |
| Efficiency | Up to 82% at 150mA load with 3V input - balances low-noise switching and micropower operation |
| Operating Temperature | 0°C to 70°C - commercial-grade thermal envelope suitable for consumer and industrial embedded systems |
Pinout & Package
LT1107CS8-5#PBF is housed in an 8-lead plastic SOIC (S8) package, 0.150-inch narrow body, with exposed pad not present and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit programming input | Connect to VIN directly for default 1.5A switch limit; add resistor to reduce peak current - protects against inductor saturation during input transients |
| VIN (Pin 2) | Main power supply input | Accepts 2V–30V; powers internal circuitry and switch driver - supports single-cell alkaline to 24V industrial rails |
| SW1 (Pin 3) | Power switch collector | In step-up: connects to inductor/diode node; in step-down: ties to VIN - defines high-side switching path |
| SW2 (Pin 4) | Power switch emitter | In step-up: grounded; in step-down: connects to inductor/diode node - must not fall below –0.5V to avoid damage |
| GND (Pin 5) | Analog and power ground reference | Common return for feedback, gain block, and switch - requires low-impedance PCB connection to minimize noise coupling |
| AO (Pin 6) | Auxiliary gain block open-collector output | Sinks up to 300µA; used for low-battery flag or error signal - requires external pull-up for logic-level interfacing |
| SET (Pin 7) | Gain block non-inverting input | Accepts resistor divider from VIN for programmable trip point - enables undervoltage lockout or battery monitoring |
| FB/SENSE (Pin 8) | Feedback input / fixed-voltage sense | Internally connected to 5V divider network; must tie to output in LT1107CS8-5#PBF - eliminates external resistor network |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 320µA quiescent current extends battery runtime in always-on portable devices like cellular telephones and handheld instruments |
| Three-component fixed 5V design | Requires only inductor, diode, and output capacitor - reduces BOM count and layout area for space-constrained applications |
| On-chip low-battery detector | Configurable via SET/AO pins without external comparators - enables system-level power management in palmtop computers |
| Step-up/step-down/inverting flexibility | Single IC supports 3 topologies using same pinout - simplifies design reuse across 3V→5V, 24V→5V, and LCD bias generator applications |
| Internal 1A power switch | Eliminates need for external transistor in ≤300mA 5V supplies - improves reliability and reduces thermal design complexity |
Applications
| Palmtop Computer Logic Supply | 24V to 5V Industrial Converter |
|---|---|
Use Scenario: Powers 5V logic rails in battery-operated handheld computing devices with tight space and power budgets. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter delivering regulated 5V from 2–6V alkaline cell input in step-up mode. Use Value: 320µA quiescent current and 82% efficiency at 150mA enable >100-hour runtime on two AA cells. | Use Scenario: Generates stable 5V supply from 24V factory automation or telecom distribution rails. IC Role / Device Role / Timing Role: Step-down regulator operating at 63kHz with internal 1A switch and programmable current limit. Use Value: Delivers 300mA at 5V with no external feedback resistors, reducing component count and improving long-term stability. |
| LCD Bias Generator | Battery Backup Supply |
Use Scenario: Provides negative bias voltage for LCD segment drivers in portable instrumentation. IC Role / Device Role / Timing Role: Inverting converter generating –5V from +5V input using LT1107CS8-5#PBF in positive-to-negative configuration. Use Value: On-chip 1.25V reference and comparator enable precise regulation without external op-amps or references. | Use Scenario: Maintains 5V backup power during main supply interruption in memory retention or real-time clock circuits. IC Role / Device Role / Timing Role: Micropower step-down regulator accepting wide-input 3–30V and delivering low-noise 5V output. Use Value: 360µA no-load current and built-in undervoltage lockout prevent deep discharge of backup coin cells. |
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 |
|---|---|---|---|
| LTC1174CS8-5#PBF | Higher 1.4MHz switching frequency; lower 100µA quiescent current; requires external feedback resistors even in fixed-output variants | Better suited for ultra-low-noise, compact designs where EMI filtering is critical; less tolerant of high-ESR output capacitors | Select LTC1174CS8-5#PBF when board space is constrained and higher-frequency operation justifies added external components |
| MAX761ESA+ | Pin-compatible 5V fixed-output variant; 300µA quiescent current; 1.3MHz oscillator; no integrated gain block or low-battery comparator | Lacks AO/SET functionality - cannot implement battery monitoring or ripple reduction without external circuitry | Choose MAX761ESA+ only when basic 5V conversion is required and auxiliary analog functions are unnecessary |
Compared with LTC1174CS8-5#PBF and MAX761ESA+, the LT1107CS8-5#PBF uniquely combines micropower operation, integrated gain block, and three-topology flexibility in a single SO-8 package - making it optimal for cost-sensitive, function-rich portable power designs where external component count and feature integration are prioritized.
Availability
LT1107CS8-5#PBF is available at Aetrix Electronics and suitable for palmtop computers, 24V-to-5V industrial converters, and LCD bias generators requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LT1107CS8-5#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 its legacy precision analog and power management product lines with full datasheet, simulation model, and application support.
The LT1107CS8-5#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-operated and space-constrained systems requiring high efficiency at light loads and multi-topology flexibility without external feedback networks.
FAQ
What is the maximum output current capability of the LT1107CS8-5#PBF in step-down mode?
The LT1107CS8-5#PBF delivers up to 300mA at 5V from a 24V input in step-down mode, as confirmed in the Typical Applications section. This assumes proper thermal management in the SO-8 package (θJA = 150°C/W) and use of a Schottky diode and low-DCR inductor. Peak switch current is internally limited to 1.5A, but sustained output is thermally constrained to ~300mA at 70°C ambient.
Does the LT1107CS8-5#PBF require external feedback resistors to set the 5V output?
No, the LT1107CS8-5#PBF does not require external feedback resistors. It integrates on-chip voltage-setting resistors for fixed 5V output, and Pin 8 (FB/SENSE) must be connected directly to the output node. This eliminates resistor tolerance errors and simplifies layout - a key differentiator from the adjustable LT1107 version.
Can the LT1107CS8-5#PBF be used in inverting (positive-to-negative) configurations?
Yes, the LT1107CS8-5#PBF supports inverting operation per Figure 3 in the datasheet. It generates regulated negative outputs (e.g., –5V) from positive inputs using the same SO-8 pinout. However, |VOUT| must be ≤6.2V unless a series Schottky diode is added to SW2, and D1 must be Schottky to prevent destructive negative excursions below –0.5V.
What is the purpose of the AO and SET pins on the LT1107CS8-5#PBF?
The AO (pin 6) and SET (pin 7) pins form an auxiliary gain block usable as a low-battery detector, linear post-regulator, or error amplifier. SET accepts a resistor divider from VIN to set a trip voltage referenced to the internal 1.25V, while AO provides an open-collector output sinking up to 300µA - enabling system-level power monitoring without external components.
Is the LT1107CS8-5#PBF pin-compatible with other members of the LT1107 family?
Yes, the LT1107CS8-5#PBF shares identical SO-8 pinout and footprint with LT1107CS8, LT1107CS8-12, LT1107IS8, and LT1107CN8 variants. All share the same ILIM/VIN/SW1/SW2/GND/AO/SET/FB pin assignments and electrical behavior - allowing drop-in replacement across fixed 5V, fixed 12V, adjustable, and temperature-grade versions.
LT1107CS8-5#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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1107CS8-5#PBF FAQ
1.How can I place an order for LT1107CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1107CS8-5#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 LT1107CS8-5#PBF reliable?
The price and inventory of LT1107CS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1107CS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1107CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1107CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1107CS8-5#PBF?
LT1107CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1107CS8-5#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 LT1107CS8-5#PBF?
For technical support, including LT1107CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1107CS8-5#PBF requirements.
6.How does Aetrix verify that LT1107CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1107CS8-5#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 LT1107CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1107CS8-5#PBF?
All LT1107CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1107CS8-5#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 LT1107CS8-5#PBF part is unused and in its original packaging.
Return procedure for LT1107CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1107CS8-5#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
