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Analog Devices Inc. LTC1474CS8-5#PBF
- Part No.:
- LTC1474CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1474CS8-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC1474CS8-5#PBF from Analog Devices (formerly Linear Technology) is a fixed-output 5V, high-efficiency step-down DC/DC converter with internal P-channel MOSFET switch, 10µA typical no-load quiescent current, 1.4Ω typical switch RDS(ON), and 3V–18V input voltage range-designed for battery-powered portable instruments requiring stable 5V at up to 250mA.
For engineers reviewing the LTC1474CS8-5#PBF datasheet, LTC1474CS8-5#PBF pinout, LTC1474CS8-5#PBF application, or LTC1474CS8-5#PBF equivalent, key selection considerations include its 5V fixed output, 8-pin SO package, low shutdown current (6µA), programmable peak current limit (325–400mA), and integrated low-battery detector functional during shutdown.
Technical Context
The LTC1474CS8-5#PBF employs Burst Mode™ operation to maintain high efficiency across light-to-moderate loads, using a 1.23V internal reference and voltage-controlled hysteretic comparator to regulate output. Its current-mode control architecture incorporates a 100mV current-sense threshold and 4.75µs minimum off-time to manage inductor current decay.
It integrates a low-battery comparator (trip point: 1.23V ±7mV) with open-drain LBO output active in shutdown, and uses logic-level RUN pin control (0.4–1.0V threshold) for micropower shutdown-distinguishing it from the pushbutton-controlled LTC1475 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.000V ±2% (guaranteed over load, line, temp); enables direct replacement of linear regulators without external feedback resistors. |
| Input Voltage Range | 3V to 18V; supports single-cell Li-ion (4.2V), dual-cell alkaline (3V), and industrial 12V rails without pre-regulation. |
| No-Load Supply Current | 10µA typical; minimizes battery drain in standby, critical for multi-year battery life in remote sensors. |
| Shutdown Current | 6µA typical; allows deep sleep states while preserving low-battery monitoring capability. |
| Switch RDS(ON) | 1.4Ω typical at VIN = 10V; limits conduction loss to <140mW at 300mA, enabling >92% peak efficiency. |
| Peak Switch Current Limit | 325–400mA (RSENSE = 0Ω); sets maximum inductor current for short-circuit protection and optimized inductor sizing. |
| Feedback Reference | 1.230V ±25mV; precision internal bandgap reference ensures tight output regulation independent of external components. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), 150°C/W θJA, RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | Internally connected to 5V divider; provides regulated 5V output and enables monitoring via external resistor network if reconfigured. |
| LBO (Pin 2) | Low-battery comparator open-drain output | Sinks up to 0.7mA when LBI < 1.23V; drives LED or microcontroller interrupt without pull-up in shutdown mode. |
| LBI (Pin 3) | Low-battery comparator input | Compares external divided battery voltage to 1.23V reference; remains active during RUN = low. |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, feedback, and comparator circuits; requires low-impedance PCB connection to minimize noise coupling. |
| SW (Pin 5) | Drain of internal P-MOSFET power switch | Connects directly to cathode of external Schottky diode; handles pulsed currents up to 750mA absolute max. |
| SENSE (Pin 6) | Current-sense input / switch source | Programs peak current limit via optional resistor to VIN; default 325mA trip when shorted to VIN (RSENSE = 0Ω). |
| VIN (Pin 7) | Main input supply connection | Accepts 3V–18V; must be decoupled with ≥10µF electrolytic + 0.1µF ceramic for EMI suppression and transient response. |
| RUN (Pin 8) | Logic-level enable/shutdown control | Ground = shutdown (6µA IQ); open/high = active; 0.7V threshold ensures compatibility with 3.3V/5V logic outputs. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables dropout as low as VOUT – VDS(ON)·ILOAD; sustains regulation down to VIN ≈ 5.1V at full load. |
| Burst Mode™ efficiency optimization | Maintains >85% efficiency at 1mA load by alternating burst cycles and 9µA sleep mode-critical for IoT endpoint longevity. |
| Integrated low-battery detector | Active during shutdown with 1.23V ±7mV trip threshold; eliminates need for external supervisor IC in battery-gauging designs. |
| Programmable current limit | Adjustable from 10mA to 400mA via external RSENSE; allows trade-off between inductor size, ripple, and short-circuit robustness. |
| Short-circuit protection | Auto-recovering foldback via current-sense comparator; prevents thermal runaway during output faults without latch-up. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor node operating on two AA alkaline cells (3V initial) with 10-second wake-up intervals. IC Role / Device Role / Timing Role: Primary 5V power rail generator for MCU, ADC, and wireless transceiver; regulates output despite falling battery voltage. Use Value: 10µA no-load current extends battery life beyond 5 years; 100% duty cycle maintains 5V output until battery drops below 3.2V. | Use Scenario: Ruggedized environmental monitor deployed in remote locations, logging data every minute and transmitting hourly via LoRaWAN. IC Role / Device Role / Timing Role: Main step-down regulator supplying 5V to microcontroller, SD card interface, and analog front-end. Use Value: Integrated low-battery comparator (active in shutdown) triggers graceful shutdown and data save before brownout-no external supervisor required. |
| Handheld Test Equipment | Smart Building Controllers |
Use Scenario: Pocket-sized multimeter powered by a single 9V alkaline battery, requiring clean 5V for precision analog circuitry and LCD backlight. IC Role / Device Role / Timing Role: High-efficiency 5V supply with ultra-low noise; powers op-amp rails and reference buffers. Use Value: 92% peak efficiency and low output ripple (<50mVP-P) prevent measurement drift; 1.4Ω RDS(ON) limits self-heating during extended use. | Use Scenario: DIN-rail mounted HVAC controller with 24V DC input, needing isolated 5V for microcontroller and communication interfaces (RS-485, CAN). IC Role / Device Role / Timing Role: Pre-regulator stage stepping 24V down to 5V before secondary LDOs; handles wide input transients per IEC 61000-4-5. Use Value: 18V absolute max input rating and 750mA switch current rating withstand 40V load-dump spikes; SO-8 package supports conformal coating for harsh environments. |
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; 1.8µA shutdown current; no integrated LBO/LBI. | Higher switching frequency enables smaller inductors but lower light-load efficiency; lacks battery-monitoring features. | Select for space-constrained designs needing <1µH inductors; avoid when battery state-of-charge monitoring is required. |
| MAX1776ESA+ | Current-mode PWM controller; 2.7V–20V input; adjustable output; 22µA quiescent current; includes enable and power-good. | Requires external MOSFET and feedback resistors; higher IQ reduces battery life vs LTC1474CS8-5#PBF's 10µA. | Select when adjustable output or external FET drive is needed; not drop-in for fixed 5V applications. |
Compared with TPS62231DRYR and MAX1776ESA+, the LTC1474CS8-5#PBF delivers superior light-load efficiency via Burst Mode™ and built-in battery monitoring-making it optimal for long-life, feature-integrated battery systems where board area and component count are constrained.
Availability
LTC1474CS8-5#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test equipment, and smart building controllers requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1474CS8-5#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1474CS8-5#PBF belongs to ADI's legacy Linear Technology power management portfolio, engineered specifically for ultra-low-power, battery-operated DC/DC conversion with integrated system supervision functions.
FAQ
What is the maximum continuous output current supported by the LTC1474CS8-5#PBF?
The LTC1474CS8-5#PBF supports up to 250mA continuous output current in typical applications, as validated in the Figure 1 reference design (VIN = 10V, VOUT = 5V, L = 100µH). Peak switch current is internally limited to 325–400mA depending on SENSE pin configuration, providing short-circuit protection without external current limiting.
Does the LTC1474CS8-5#PBF require external feedback resistors to set the 5V output?
No-the LTC1474CS8-5#PBF is a fixed-output variant with internal resistor divider; no external feedback resistors are needed to achieve 5.000V ±2%. The VOUT/VFB pin (Pin 1) is internally connected to this divider, simplifying layout and reducing BOM count versus adjustable versions like LTC1474CS8.
Can the low-battery detector in the LTC1474CS8-5#PBF operate while the device is in shutdown mode?
Yes-the low-battery comparator remains fully functional during shutdown (RUN = low), drawing only 6µA total. The LBI input continues comparing the external battery divider to the 1.23V reference, and LBO will sink current when the threshold is crossed-enabling battery monitoring without waking the main system.
What is the purpose of the SENSE pin on the LTC1474CS8-5#PBF, and how is it used?
The SENSE pin (Pin 6) sets the peak inductor current limit by sensing voltage across an optional external resistor between SENSE and VIN. With SENSE shorted to VIN (RSENSE = 0Ω), the LTC1474CS8-5#PBF defaults to 325–400mA trip threshold. Adding RSENSE lowers the trip point-for example, 1.1Ω yields ~75mA-optimizing inductor size and ripple for light-load applications.
Is the LTC1474CS8-5#PBF pin-compatible with the LTC1475CS8-5#PBF?
No-the LTC1474CS8-5#PBF and LTC1475CS8-5#PBF share identical pinouts and packages but differ functionally: LTC1474 uses logic-level RUN pin control, while LTC1475 uses pushbutton ON/LBI-OFF latching. Swapping them requires redesigning the enable interface and may disable low-battery functionality if LBI is repurposed as OFF.
LTC1474CS8-5#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1474CS8-5#PBF FAQ
1.How can I place an order for LTC1474CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474CS8-5#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 LTC1474CS8-5#PBF reliable?
The price and inventory of LTC1474CS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1474CS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1474CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474CS8-5#PBF?
LTC1474CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474CS8-5#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 LTC1474CS8-5#PBF?
For technical support, including LTC1474CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474CS8-5#PBF requirements.
6.How does Aetrix verify that LTC1474CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1474CS8-5#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 LTC1474CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1474CS8-5#PBF?
All LTC1474CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474CS8-5#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 LTC1474CS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1474CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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