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Analog Devices Inc. LTC1474CS8#PBF
- Part No.:
- LTC1474CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1474CS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
LTC1474CS8#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with an internal 1.4Ω P-channel MOSFET switch, fixed 3.3V output, and 8-lead SOIC package. It operates from 3V to 18V input, delivers up to 250mA output current, achieves >92% peak efficiency, and draws only 10µA typical no-load supply current. It is designed for battery-powered portable instruments requiring stable low-voltage rails.
For engineers reviewing the LTC1474CS8#PBF datasheet, LTC1474CS8#PBF pinout, LTC1474CS8#PBF application, or LTC1474CS8#PBF equivalent, key selection criteria include its 3.3V fixed output, 10µA quiescent current, 1.4Ω internal switch RDS(ON), programmable current limit (325–400mA), and low-battery detection functional during shutdown.
Technical Context
The LTC1474CS8#PBF uses Burst Mode™ operation to maintain regulation at light loads while minimizing quiescent current: it alternates short energy bursts (with 4.75µs off-time) and deep-sleep cycles where only the voltage comparator, 1.23V reference, and low-battery comparator remain active. Its peak-current control loop monitors switch current via an internal 5Ω sense resistor (or external RSENSE) and trips at 100mV, enabling precise current limiting and short-circuit protection.
It integrates a low-battery detector with 1.23V internal reference and open-drain LBO output that remains fully operational in shutdown mode. The RUN pin provides logic-level shutdown control (ground = shutdown, open/high = run), distinguishing it from the pushbutton-controlled LTC1475 variant. Its 100% duty-cycle capability enables ultra-low dropout operation near VIN ≈ VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V); tightly regulated for powering 3.3V logic and analog circuitry without external feedback resistors. |
| Input Voltage Range | 3V to 18V; supports single-cell Li-ion (4.2V), dual-cell alkaline (3V–3.2V), and industrial 12V rails without external pre-regulation. |
| No-Load Supply Current | 10µA typical; enables multi-year battery life in always-on sensor nodes and remote monitoring devices. |
| Shutdown Current | 6µA typical; maintains ultra-low standby power while preserving low-battery monitoring functionality. |
| Internal Switch RDS(ON) | 1.4Ω typical at VIN = 10V; reduces conduction loss and simplifies thermal design for ≤250mA continuous output. |
| Current Limit Threshold | 325–400mA (RSENSE = 0Ω); sets maximum inductor/switch current to optimize efficiency and ripple for moderate-load applications. |
| Feedback Reference Voltage | 1.230V ±25mV; precision bandgap reference used internally to regulate output; enables accurate fixed-output or adjustable configurations. |
| Low-Battery Trip Threshold | 1.23V ±0.04V on LBI pin; allows reliable battery depletion detection down to ~2.5V (with 2:1 divider), active even in shutdown. |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 150°C/W junction-to-ambient thermal resistance, RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | In fixed 3.3V version, connects internally to resistive divider; externally ties to output capacitor for regulation; requires low-ESR ceramic bypass. |
| LBO (Pin 2) | Low-battery comparator open-drain output | Sinks current when LBI < 1.23V; drives LED or microcontroller interrupt; requires external pull-up for logic-level signaling. |
| LBI (Pin 3) | Low-battery comparator input | Monitors divided battery voltage; remains active in shutdown; threshold set by external resistor divider (e.g., 1MΩ/1MΩ for ~2.46V trip). |
| GND (Pin 4) | Analog and power ground reference | Common return path for feedback, current sense, and low-battery circuits; must be connected to clean system ground plane. |
| SW (Pin 5) | Switch node (drain of internal PMOS) | Connects directly to cathode of Schottky catch diode and inductor; high dv/dt node requiring tight layout and minimal trace length. |
| SENSE (Pin 6) | Current sense input / source of internal PMOS | Programs peak current limit via optional external resistor to VIN; shorted to VIN (RSENSE = 0) defaults to 325mA min trip. |
| VIN (Pin 7) | Main input supply | Accepts 3V–18V; requires local 0.1µF ceramic + bulk capacitor (e.g., 10µF/25V) for high-frequency and RMS current handling. |
| RUN (Pin 8) | Logic-controlled enable/shutdown input | Ground = shutdown (6µA IQ); open or >0.7V = active; no external pull-up needed; compatible with GPIO or manual switch. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at µA-level loads by alternating short switching bursts and deep-sleep cycles-enabling >85% efficiency at 1mA load. |
| 100% duty-cycle capability | Allows VOUT regulation with VIN as low as 3.3V (e.g., single LiFePO4 cell), eliminating dropout-related brownouts. |
| Integrated low-battery detector | Active during full operation and shutdown; uses same 1.23V reference as regulator-ensures consistent trip point across all modes. |
| Programmable current limit | Adjustable from 10mA to 400mA via external RSENSE; enables optimization of inductor size, ripple, and noise for specific load profiles. |
| Short-circuit protection | Peak-current limiting prevents damage during output faults; automatic recovery upon fault removal without latch-off or reset required. |
| Minimal external components | Requires only inductor, Schottky diode, input/output capacitors, and optional RSENSE-reducing BOM count and PCB area vs. controller-based solutions. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered wearable ECG monitor operating continuously for 7+ days on two AA alkaline cells. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator; regulates output despite declining battery voltage from 3.2V to 2.4V. Use Value: 10µA quiescent current extends runtime; low-battery detection (LBI/LBO) triggers alert before sensor data corruption occurs. |
Use Scenario: Remote environmental logger using LoRaWAN, sampling temperature/humidity every 10 minutes and transmitting hourly. IC Role / Device Role / Timing Role: Efficient step-down converter supplying 3.3V to MCU, sensor, and RF transceiver during brief active periods. Use Value: Burst Mode™ ensures >90% efficiency at 100µA average load; shutdown mode (6µA) eliminates leakage between sampling intervals. |
| Handheld Test Equipment | Smart Utility Meters |
Use Scenario: Pocket-sized multimeter with LCD display, analog front-end, and Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Fixed 3.3V supply for mixed-signal ICs and digital subsystems; handles transient loads from display backlight pulses. Use Value: Internal 1.4Ω switch eliminates external MOSFET; 325mA current limit protects against inrush during LCD initialization. |
Use Scenario: AMI (Advanced Metering Infrastructure) electricity meter powered by primary lithium thionyl chloride battery (3.6V). IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 3.3V to metrology ASIC, RTC, and PLC communication interface. Use Value: 100% duty cycle sustains regulation as battery decays to 3.3V; LBO signal feeds into tamper-detection logic for compliance reporting. |
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; 3.3V output; 25µA IQ; 300mA IOUT | Higher switching frequency enables smaller inductors but increases light-load inefficiency; lacks integrated low-battery comparator. | Choose for space-constrained designs needing compact magnetics and predictable EMI profile; avoid where multi-year battery life is critical. |
| MAX17222ELT+ | Hysteretic 500kHz operation; 0.7V–5.5V input; 3.3V output; 0.9µA IQ; 400mA IOUT; no LBI/LBO pins | Ultra-low IQ suits coin-cell applications; no integrated battery monitoring; requires external circuitry for low-VBAT alert. | Prefer for sub-10µA standby systems without battery monitoring needs; not suitable when LBO-driven shutdown or status signaling is required. |
Compared with TPS62231DRYR and MAX17222ELT+, the LTC1474CS8#PBF uniquely combines ultra-low 10µA quiescent current, integrated low-battery detection with shutdown-aware LBO, and robust 3V–18V input range-making it optimal for industrial and medical battery-powered systems demanding both longevity and intelligent power management.
Availability
LTC1474CS8#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test equipment, and smart utility meters requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC1474CS8#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 continues its legacy of high-performance analog and power management ICs with rigorous reliability testing and automotive/industrial qualification.
The LTC1474CS8#PBF belongs to Linear's legacy low-quiescent-current DC/DC converter family, engineered specifically for battery-powered instrumentation and portable electronics where efficiency at microamp loads and intelligent power supervision are essential.
FAQ
What is the maximum continuous output current of the LTC1474CS8#PBF?
The LTC1474CS8#PBF is rated for up to 250mA continuous output current under typical conditions (VIN = 10V, TA = 25°C, proper layout and thermal management). Its peak switch current limit is programmable from 325mA to 400mA when RSENSE = 0Ω, providing margin for transient loads and ensuring reliable operation within SOIC package thermal limits.
Does the LTC1474CS8#PBF support adjustable output voltages?
No, the LTC1474CS8#PBF is a fixed 3.3V output variant. Adjustable versions (e.g., LTC1474CS8) require external feedback resistors between VOUT and VFB (Pin 1) and are designated separately. The LTC1474CS8#PBF integrates the feedback divider internally-no external resistors are needed or supported for output voltage adjustment.
How does the low-battery detector function during shutdown mode?
The low-battery detector in the LTC1474CS8#PBF remains fully active during shutdown: the internal 1.23V reference and comparator continue operating, allowing LBI (Pin 3) monitoring and LBO (Pin 2) sinking current whenever VLBI falls below 1.23V. This enables battery-status awareness even when the main regulator is disabled, supporting graceful system shutdown or wake-up triggers.
What is the purpose of the SENSE pin on the LTC1474CS8#PBF?
The SENSE pin (Pin 6) on the LTC1474CS8#PBF serves as the current-sense input for the internal peak-current comparator. When connected to VIN via an optional external resistor (RSENSE), it programs the maximum switch current from 10mA to 400mA. With RSENSE = 0Ω (pins 6 and 7 shorted), the LTC1474CS8#PBF defaults to a 325mA minimum current limit using its internal 5Ω sense element.
Can the LTC1474CS8#PBF operate with an input voltage lower than 3.3V?
No-the LTC1474CS8#PBF requires a minimum input voltage of 3V to operate, but it cannot sustain regulation when VIN drops below the 3.3V output due to its synchronous architecture and lack of 100% duty-cycle support below VOUT. However, its 100% duty-cycle capability allows regulation down to VIN = VOUT = 3.3V, making it suitable for batteries discharging to ~3.3V (e.g., LiFePO4).
LTC1474CS8#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.23V
- 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#PBF FAQ
1.How can I place an order for LTC1474CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474CS8#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#PBF reliable?
The price and inventory of LTC1474CS8#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1474CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474CS8#PBF?
LTC1474CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474CS8#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#PBF?
For technical support, including LTC1474CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474CS8#PBF requirements.
6.How does Aetrix verify that LTC1474CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1474CS8#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1474CS8#PBF?
All LTC1474CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474CS8#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#PBF part is unused and in its original packaging.
Return procedure for LTC1474CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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