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Analog Devices Inc. LTC1474CS8-3.3#PBF
- Part No.:
- LTC1474CS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1474CS8-3.3#PBF.pdf
- Description:
- IC REG BUCK BOOST 3.3V 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:116
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Product details
Overview
LTC1474CS8-3.3#PBF from Analog Devices (formerly Linear Technology) is a fixed-output 3.3V, high-efficiency step-down DC/DC converter with internal P-channel MOSFET, 10µA typical no-load quiescent current, 1.4Ω switch RDS(ON), and operation from 3V to 18V input. It delivers up to 250mA output in an 8-lead SO package and is designed for battery-powered portable instruments and wireless modems.
For engineers reviewing the LTC1474CS8-3.3#PBF datasheet, LTC1474CS8-3.3#PBF pinout, LTC1474CS8-3.3#PBF application, or LTC1474CS8-3.3#PBF equivalent, key selection criteria include its 3.3V fixed output accuracy (±2%), Burst Mode™ operation for ultra-low IQ, programmable peak current limit (325–400mA), active-low shutdown (6µA IQ), and low-battery detection functional during shutdown.
Technical Context
The LTC1474CS8-3.3#PBF uses Burst Mode™ control to maintain regulation at light loads by alternating short energy bursts and sleep cycles-drawing only 9µA typical during sleep. Its internal 1.23V reference compares against a fixed resistive divider to regulate VOUT = 3.3V ±2%.
It integrates a 1.4Ω P-channel MOSFET switch, current-sense comparator with 100mV threshold, 4.75µs minimum off-time timer, and a dedicated low-battery comparator (LBI/LBO) that remains active in shutdown. The RUN pin enables logic-controlled on/off with 0.7V threshold and 0.8µA source current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | 3.300V ±2% - tightly regulated fixed output for powering 3.3V logic rails without external feedback resistors. |
| IQ (No Load) | 10µA typ - enables multi-year battery life in always-on sensor nodes and remote monitors. |
| VIN Range | 3V to 18V - supports single-cell Li-ion (4.2V), dual-cell alkaline (3V), and industrial 12V rails without external regulators. |
| RDS(ON) | 1.4Ω typ at VIN = 10V - minimizes conduction loss in medium-current (≤250mA) step-down applications. |
| IPEAK Limit | 325–400mA (RSENSE = 0Ω) - sets maximum inductor current to optimize efficiency and ripple for 250mA load. |
| Shutdown IQ | 6µA typ - reduces system standby power when host MCU asserts RUN = low. |
| Efficiency | 92% at 250mA, VIN = 5V - achieves high conversion efficiency across wide load range via Burst Mode™ and low-RDS(ON). |
Pinout & Package
Package: 8-lead plastic SO (Small Outline), 150°C/W θJA, RoHS-compliant, lead-free (Pb-free) #PBF suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | Internally connected to fixed 3.3V divider; provides regulation point and connects to output capacitor for stability. |
| LBO (Pin 2) | Low-battery open-drain output | Sinks up to 0.7mA when LBI < 1.23V; drives LED or MCU interrupt without pull-up resistor. |
| LBI (Pin 3) | Low-battery input comparator | Monitors battery voltage via external divider; remains active in shutdown to enable early warning. |
| GND (Pin 4) | Power and signal ground reference | Common return path for switch, sense, and feedback circuits; must be low-impedance connection to minimize noise. |
| SW (Pin 5) | Switch node | Drain of internal P-MOSFET; connects directly to cathode of Schottky catch diode and inductor. |
| SENSE (Pin 6) | Current sense input | Programs peak switch current via optional resistor to VIN; defaults to 400mA limit when shorted to VIN. |
| VIN (Pin 7) | Main input supply | Accepts 3V–18V; powers internal circuitry and supplies gate drive for P-MOSFET switch. |
| RUN (Pin 8) | Active-high enable input | Logic-level control: open/high = run (10µA IQ), grounded = shutdown (6µA IQ); 0.7V threshold ensures TTL/CMOS compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at microamp loads while holding IQ ≤10µA-critical for coin-cell and energy-harvesting systems. |
| 100% duty-cycle capability | Enables dropout operation down to VIN = VOUT + 0.1V-supports brownout recovery and ultra-low-VIN scenarios. |
| Integrated low-battery detector | Functional during shutdown with 1.23V reference and 5mV hysteresis-provides fail-safe battery monitoring without external IC. |
| Programmable current limit | Adjustable from 325mA to 400mA using zero or discrete RSENSE-optimizes inductor size and ripple for target load. |
| Short-circuit protection | Auto-recovering foldback via current comparator-prevents thermal runaway during output faults without latch-up. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator delivering 250mA with Burst Mode™ to extend talk time. Use Value: 92% efficiency at 250mA and 10µA no-load IQ directly increase battery runtime by >15% vs. linear regulators. | Use Scenario: Supplying microcontroller, ADC, and display driver in handheld multimeter or gas detector. IC Role / Device Role / Timing Role: Main system regulator with shutdown control from MCU GPIO and low-battery alert via LBO. Use Value: Active-low RUN pin and always-on LBI/LBO enable precise power sequencing and predictive battery depletion warnings. |
| Battery-Operated Digital Devices | 4mA–20mA Current Loop Step-Down |
Use Scenario: Providing stable 3.3V rail for Bluetooth LE modules and NFC readers in wearables. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter enabling multi-week standby on CR2032 coin cell. Use Value: 6µA shutdown current and 10µA no-load IQ reduce average system power to sub-10µA in deep-sleep states. | Use Scenario: Generating isolated 3.3V supply for loop-powered field transmitter electronics. IC Role / Device Role / Timing Role: Secondary regulator deriving 3.3V from 24V loop supply, with current-limit programming for fault containment. Use Value: Adjustable IPEAK limit (via RSENSE) ensures safe operation under 4–20mA loop fault conditions without external current limiting. |
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 | 3.3V fixed, 2MHz switching, 25µA IQ, 300mA IOUT, 2.05V–6.5V VIN | Higher frequency allows smaller inductors but higher EMI; not suitable for >6.5V input or ultra-low-IQ designs. | Choose for space-constrained PCBs where 2MHz operation and 300mA output are required, but verify input voltage compatibility. |
| MAX17222ETA+ | 3.3V fixed, 500kHz, 1.3µA IQ, 300mA IOUT, 2.0V–5.5V VIN | Lower IQ than LTC1474CS8-3.3#PBF but limited to 5.5V max input-cannot replace in 12V or dual-alkaline systems. | Prefer for ultra-long-life coin-cell applications below 5.5V; avoid where input exceeds 5.5V or low-battery detection is mandatory. |
Compared with TPS62231DRYR and MAX17222ETA+, the LTC1474CS8-3.3#PBF uniquely supports 18V input, retains low-battery monitoring in shutdown, and delivers 92% efficiency at 5V input-making it optimal for industrial portable equipment with wide input ranges and safety-critical battery management.
Availability
LTC1474CS8-3.3#PBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, and battery-operated digital devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1474CS8-3.3#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 semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, industrial, and automotive applications.
The LTC1474 series was developed by Linear Technology (acquired by ADI in 2017) specifically for ultra-low-quiescent-current, high-efficiency step-down conversion in battery-powered portable electronics-emphasizing Burst Mode™ operation, integrated protection, and minimal external components.
FAQ
What is the output voltage tolerance of the LTC1474CS8-3.3#PBF?
The LTC1474CS8-3.3#PBF delivers a nominal 3.3V output with a guaranteed tolerance of ±2% over temperature and line/load conditions, corresponding to 3.234V to 3.366V at 50mA load per the datasheet's electrical characteristics table. This tight regulation is achieved using an internal 1.23V reference and factory-trimmed feedback divider, eliminating the need for external resistors or calibration.
Does the LTC1474CS8-3.3#PBF support shutdown mode, and what is its quiescent current in that state?
Yes, the LTC1474CS8-3.3#PBF supports active-low logic-controlled shutdown via the RUN pin. When RUN is pulled low, the device enters shutdown mode with a typical input supply current of 6µA-verified in the Electrical Characteristics table under "Shutdown" condition. The low-battery comparator and 1.23V reference remain powered, enabling continuous battery monitoring even when the main regulator is disabled.
Can the LTC1474CS8-3.3#PBF operate with input voltages above 12V?
Yes, the LTC1474CS8-3.3#PBF is rated for continuous operation from 3V to 18V input, with absolute maximum VIN of 20V. Its internal P-channel MOSFET and control circuitry are designed to handle 15V and 18V rails-confirmed in both Absolute Maximum Ratings and Typical Performance graphs showing efficiency at VIN = 15V. This makes it suitable for dual-cell alkaline, 12V industrial, and wide-range battery systems.
How does the current limit function on the LTC1474CS8-3.3#PBF, and is an external resistor required?
The LTC1474CS8-3.3#PBF implements peak current limiting via its SENSE pin, with a default trip threshold of 325–400mA when SENSE is shorted to VIN (no external resistor). An optional resistor between SENSE and VIN allows programming lower limits-e.g., 70–85mA with 1.1Ω. No external resistor is required for standard 250mA operation, simplifying design and reducing BOM count.
Is the low-battery detection feature of the LTC1474CS8-3.3#PBF functional during shutdown?
Yes, the low-battery comparator (LBI/LBO) remains fully operational during shutdown mode. As stated in the Features list and Functional Diagram, the 1.23V reference and comparator circuitry stay powered even when RUN = low. This allows continuous monitoring of battery voltage and assertion of LBO (open-drain sink) when LBI falls below 1.23V-enabling host systems to initiate graceful shutdown before complete battery depletion.
LTC1474CS8-3.3#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):
- 3.3V
- 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
LTC1474CS8-3.3#PBF FAQ
1.How can I place an order for LTC1474CS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474CS8-3.3#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 LTC1474CS8-3.3#PBF reliable?
The price and inventory of LTC1474CS8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1474CS8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1474CS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474CS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474CS8-3.3#PBF?
LTC1474CS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474CS8-3.3#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 LTC1474CS8-3.3#PBF?
For technical support, including LTC1474CS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474CS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1474CS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1474CS8-3.3#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 LTC1474CS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1474CS8-3.3#PBF?
All LTC1474CS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474CS8-3.3#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 LTC1474CS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1474CS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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