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Analog Devices Inc. LTC1474IS8-5#PBF
- Part No.:
- LTC1474IS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1474IS8-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC1474IS8-5#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with internal P-channel MOSFET switch, fixed 5V output, and industrial-grade temperature range (–40°C to +85°C). It delivers up to 300mA output current, achieves >92% peak efficiency at 250mA, operates from 3V to 18V input, and features 10µA typical no-load supply current and 6µA shutdown current.
For engineers reviewing the LTC1474IS8-5#PBF datasheet, LTC1474IS8-5#PBF pinout, LTC1474IS8-5#PBF application, or LTC1474IS8-5#PBF equivalent, key selection considerations include its 5V fixed output, MSOP-8 package, programmable current limit via external sense resistor, low-battery detector active in shutdown, and suitability for battery-powered instrumentation requiring stable 5V rail with micropower operation.
Technical Context
The LTC1474IS8-5#PBF uses Burst Mode™ operation to maintain regulation while minimizing quiescent current: it alternates short energy bursts (with 4.75µs off-time) and sleep cycles where only reference, voltage comparator, and low-battery comparator remain active. Its internal 1.4Ω PMOS switch enables high efficiency across wide VIN (3V–18V) and load (1mA–300mA) ranges.
Peak inductor current is programmable via optional external sense resistor (RSENSE), defaulting to 325–400mA when omitted; the current comparator trips at 100mV across RSENSE + 0.25Ω internal resistance. The low-battery comparator (trip threshold 1.16–1.27V) remains functional during shutdown, sinking current on LBO when LBI falls below reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.000 V ±2% - tightly regulated rail for logic, sensors, or analog circuitry without external feedback divider. |
| Input Voltage Range | 3V to 18V - supports single-cell Li-ion, multi-cell alkaline/NiMH, and industrial 12V rails. |
| Max Output Current | 300 mA - sufficient for moderate-power microcontrollers, RF modules, or sensor interfaces. |
| No-Load Supply Current | 10 µA typical - enables multi-year battery life in always-on monitoring applications. |
| Shutdown Current | 6 µA typical - preserves battery during extended standby with full low-battery detection retained. |
| Switch On-Resistance | 1.4 Ω typical at VIN = 10V - minimizes conduction loss and supports high efficiency at medium loads. |
| Feedback Reference Voltage | 1.230 V ±2.4% - internal precision bandgap used to regulate fixed 5V output via internal resistor divider. |
| Low-Battery Threshold | 1.23 V ±2.9% - accurate trip point for undervoltage warning with hysteresis (5 mV) to prevent chatter. |
Pinout & Package
Package: 8-lead MSOP (MS8), 3mm × 3mm, exposed pad, RoHS-compliant, rated for –40°C to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | Internally connected to fixed 5V divider; provides regulation error signal to control loop. |
| LBO (Pin 2) | Low-battery open-drain output | Sinks current when LBI < 1.23V; drives LED or microcontroller interrupt without pull-up. |
| LBI (Pin 3) | Low-battery input | Compares external battery-sense voltage to 1.23V reference; functional in shutdown. |
| GND (Pin 4) | Power and signal ground | Common return for switch, sense, and control circuits; must be low-impedance connection. |
| SW (Pin 5) | Switch node | Drain of internal PMOS; connects directly to cathode of external Schottky catch diode. |
| SENSE (Pin 6) | Current sense input | Monitors switch current via internal 5Ω + optional external resistor; sets IPEAK trip threshold. |
| VIN (Pin 7) | Main power input | Accepts 3V–18V; supplies gate drive and internal bias; requires local 0.1µF ceramic decoupling. |
| RUN (Pin 8) | Logic-controlled enable | Active-high: open/high = run, ground = shutdown; draws only 0.4–1.2µA when sourcing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at light loads with 10µA typical no-load current and >85% efficiency down to 1mA. |
| 100% duty-cycle capability | Enables dropout-free operation when VIN approaches VOUT (e.g., 5.5V → 5V), critical for battery end-of-life. |
| Programmable peak current limit | Adjustable from 10mA to 400mA via external RSENSE, optimizing inductor size and ripple for target load. |
| Low-battery detector active in shutdown | Provides undervoltage warning even when regulator is disabled, enabling system-level battery management. |
| Internal 1.4Ω PMOS switch | Eliminates external high-side switch; reduces BOM count and layout area versus controller-based solutions. |
| 8-lead MSOP package | 3mm × 3mm footprint with thermal pad supports compact, thermally efficient designs for portable equipment. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Continuous ECG or pulse oximetry monitoring powered by two AA alkaline cells (1.8V–3.2V per cell). IC Role / Device Role / Timing Role: Primary 5V power rail generator with micropower sleep mode between sensor reads. Use Value: 10µA no-load current extends battery life beyond 5 years; low-battery detection alerts user before data loss. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 minutes using Li-SOCl₂ primary battery. IC Role / Device Role / Timing Role: Efficient 5V supply for MCU and ADC during brief active periods; shuts down fully between samples. Use Value: 6µA shutdown current ensures >10-year field deployment; 3V–18V input accommodates wide battery discharge curve. |
| Handheld Test Instruments | Smart Meter Communication Modules |
|
Use Scenario: Battery-powered multimeter with LCD backlight and Bluetooth LE radio. IC Role / Device Role / Timing Role: Main 5V rail for MCU, display driver, and transceiver; supports burst-mode RF transmission. Use Value: >92% efficiency at 250mA powers radio transmit bursts without overheating; MSOP-8 eases routing in dense PCB. |
Use Scenario: PLC or RF mesh module inside electricity meter, operating from 3.6V lithium-thionyl chloride battery. IC Role / Device Role / Timing Role: Regulates stable 5V for metrology ASIC and isolated UART interface during periodic wake-ups. Use Value: Programmable current limit prevents inrush stress on aging battery; LBO signal triggers battery replacement alert. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3MHz fixed-frequency PWM (vs Burst Mode); 2.05V–6.5V input; 300mA; 22µA IQ; 2x2mm WSON-6 | Better transient response for dynamic loads; higher IQ limits ultra-low-power use; smaller package but no LBI/LBO | Select for noise-sensitive analog systems needing consistent switching frequency; avoid if battery life >5 years is required. |
| MAX17222ELT+T | Hysteretic 1.2MHz operation; 0.9V–5.5V input; 500mA; 1.3µA IQ; 6-pin µDFN | Lower IQ enables decade-scale battery life; wider VIN range excludes 12V industrial use; no integrated low-battery comparator | Select for coin-cell or single-LiFePO₄ applications where ultra-low IQ outweighs need for shutdown-state battery monitoring. |
Compared with LTC1474IS8-5#PBF, TPS62231DRYR offers tighter regulation under fast load steps but sacrifices micropower advantage, while MAX17222ELT+T achieves lower IQ at the cost of missing the integrated low-battery detector and industrial temperature rating.
Availability
LTC1474IS8-5#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test instruments, and smart meter communication modules requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1474IS8-5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1474IS8-5#PBF belongs to Linear's legacy micropower DC/DC converter product line, designed specifically for battery-operated instrumentation and portable electronics demanding ultra-low quiescent current and robust low-voltage operation.
FAQ
What is the maximum continuous output current of the LTC1474IS8-5#PBF?
The LTC1474IS8-5#PBF delivers up to 300mA continuous output current under typical conditions (VIN = 10V, TA = 25°C, with appropriate external components). Peak current is programmable via RSENSE; with RSENSE = 0Ω, IPEAK defaults to 325–400mA. Thermal derating applies above 85°C ambient or with poor PCB copper area.
Does the LTC1474IS8-5#PBF support 100% duty cycle operation?
Yes, the LTC1474IS8-5#PBF supports 100% duty cycle operation, allowing it to maintain regulation even when input voltage drops close to the 5V output (e.g., VIN = 5.2V). This feature is essential for extending usable battery life in applications powered by depleting alkaline or Li-ion cells.
How does the low-battery detector function in shutdown mode for the LTC1474IS8-5#PBF?
The low-battery detector in the LTC1474IS8-5#PBF remains fully operational during shutdown: the internal 1.23V reference and comparator continue running, so LBO will sink current whenever the voltage on LBI falls below 1.16–1.27V. This enables system-level battery monitoring without waking the main regulator.
Can the LTC1474IS8-5#PBF be used with an adjustable output voltage?
No - the LTC1474IS8-5#PBF is a fixed 5V output version. It contains an internal resistor divider tied to VOUT/VFB (Pin 1) and cannot be reconfigured for adjustable outputs. For adjustable operation, select LTC1474IS8#PBF (no suffix) or LTC1474IS8-3.3#PBF for 3.3V.
What is the purpose of the SENSE pin (Pin 6) on the LTC1474IS8-5#PBF?
The SENSE pin (Pin 6) on the LTC1474IS8-5#PBF monitors switch current via an internal 5Ω resistor in series with an optional external sense resistor (RSENSE). It sets the peak current limit (IPEAK) by tripping the current comparator when voltage across RSENSE + 0.25Ω reaches 100mV, enabling optimization for load, ripple, and efficiency.
LTC1474IS8-5#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-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Buck-Boost, SEPIC
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 750mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1474IS8-5#PBF FAQ
1.How can I place an order for LTC1474IS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474IS8-5#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 LTC1474IS8-5#PBF reliable?
The price and inventory of LTC1474IS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1474IS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1474IS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474IS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474IS8-5#PBF?
LTC1474IS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474IS8-5#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 LTC1474IS8-5#PBF?
For technical support, including LTC1474IS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474IS8-5#PBF requirements.
6.How does Aetrix verify that LTC1474IS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1474IS8-5#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 LTC1474IS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1474IS8-5#PBF?
All LTC1474IS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474IS8-5#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 LTC1474IS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1474IS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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