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Analog Devices Inc. LTC1474CS8#TRPBF
- Part No.:
- LTC1474CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1474CS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,391
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Product details
Overview
LTC1474CS8#TRPBF 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, achieves >92% efficiency at 25mA load with 5V input, and draws only 10µA no-load supply current. It is used in battery-powered portable instruments and wireless modems requiring stable low-power regulation.
For engineers reviewing the LTC1474CS8#TRPBF datasheet, LTC1474CS8#TRPBF pinout, LTC1474CS8#TRPBF application, or LTC1474CS8#TRPBF equivalent, key selection considerations include its 3.3V fixed output, 10µA quiescent current, 1.4Ω internal switch RDS(ON), programmable peak current limit (325–400mA), and low-battery detection functionality active during shutdown.
Technical Context
The LTC1474CS8#TRPBF employs Burst Mode™ operation to maintain regulation while minimizing no-load current: it alternates between short energy bursts (switch on, inductor current ramp-up) and sleep cycles (switch off, capacitor supplies load). During burst-on time, a 100mV current-sense comparator monitors switch current via internal 5Ω + optional external resistor; trip initiates a 4.75µs minimum off-time.
Its voltage control loop compares feedback at VFB (Pin 1) against a 1.23V reference; hysteresis of ±5mV enables stable light-load regulation. The low-battery comparator (LBI/LBO pins) remains fully functional in shutdown mode, sinking current when LBI falls below 1.23V - critical for battery monitoring in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V) - ensures compatibility with 3.3V logic and microcontrollers without external feedback resistors. |
| No-Load Supply Current | 10µA typical - enables multi-year battery life in standby-critical applications like remote sensors. |
| Input Voltage Range | 3V to 18V - supports single-cell Li-ion (4.2V), dual-cell alkaline (3V), and industrial 12V rails without pre-regulation. |
| Peak Switch Current Limit | 325–400mA (RSENSE = 0Ω) - sets maximum inductor stress and short-circuit protection threshold. |
| Switch RDS(ON) | 1.4Ω typical at VIN = 10V - determines conduction loss and thermal rise under full load. |
| Feedback Reference Voltage | 1.230V ±2.4% - defines regulation accuracy and sets output tolerance for fixed and adjustable versions. |
| Shutdown Current | 6µA typical - reduces system power to near-zero while preserving low-battery monitoring capability. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 150°C/W θJA, RoHS-compliant, tape-and-reel (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | Internally connected to 3.3V divider; provides regulation reference point - must be routed with low-noise layout near output capacitor. |
| LBO (Pin 2) | Low-battery open-drain output | Sinks up to 0.7mA when LBI < 1.23V - drives LED or microcontroller interrupt without pull-up resistor. |
| LBI (Pin 3) | Low-battery input comparator | Compares external battery divider to 1.23V reference - remains active in shutdown for battery health monitoring. |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, feedback, and comparators - requires solid plane connection to minimize noise coupling. |
| SW (Pin 5) | Drain of internal P-MOSFET switch | High-frequency switching node - must be placed adjacent to Schottky diode cathode and inductor to minimize parasitic inductance. |
| SENSE (Pin 6) | Current sense input | Monitors switch current via internal 5Ω + optional external resistor - determines peak current limit and short-circuit response. |
| VIN (Pin 7) | Main input supply | Accepts 3V–18V; powers internal circuitry and switch - requires local 0.1µF ceramic + bulk capacitor. |
| RUN (Pin 8) | Logic-controlled enable input | Active-high: open/high = run, ground = shutdown - draws only 0.8µA leakage, enabling direct MCU GPIO control. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables dropout-free regulation down to VIN = VOUT - critical for end-of-life battery operation in 3.3V systems. |
| Burst Mode™ efficiency optimization | Maintains >85% efficiency at 1mA load - eliminates linear regulator trade-off between quiescent current and light-load efficiency. |
| Integrated low-battery detector with shutdown persistence | Provides reliable battery state indication even when main regulator is disabled - eliminates need for separate supervisor IC. |
| Programmable peak current limit (325–400mA) | Allows inductor and diode sizing optimization for specific load profiles - reduces EMI and output ripple without sacrificing short-circuit protection. |
| Internal 1.4Ω P-channel MOSFET switch | Removes external high-side switch requirement - simplifies BOM and PCB layout while ensuring matched gate drive timing. |
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 providing clean, efficient power with ultra-low standby draw. Use Value: Extends talk time by maintaining >90% efficiency across 10mA–250mA load range and enabling 10µA deep-sleep current. | Use Scenario: Regulating power for handheld multimeter or gas detector with alkaline battery pack (4×AA = 6V nominal). IC Role / Device Role / Timing Role: Main system supply delivering regulated 3.3V to microcontroller, ADC, and display driver. Use Value: Supports 10+ year battery life in measurement mode via 6µA shutdown current and accurate low-battery warning before cutoff. |
| Battery Chargers | Intrinsic Safety Applications |
Use Scenario: Providing isolated 3.3V bias for charge controller IC and status LEDs in USB-powered smart charger. IC Role / Device Role / Timing Role: Auxiliary supply generating stable rail independent of charging voltage fluctuations (5–12V USB input). Use Value: Ensures consistent LED brightness and accurate voltage reference for charge termination sensing across wide input range. | Use Scenario: Powering explosion-proof sensor nodes in hazardous environments where energy storage must remain below ignition thresholds. IC Role / Device Role / Timing Role: Intrinsically safe DC/DC converter limiting fault energy via 325mA peak current clamp and 1.4Ω switch resistance. Use Value: Meets IEC 60079-11 requirements by inherently limiting stored energy and fault current without external current-limiting components. |
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, 17µA IQ, 2MHz switching, 300mA max, 6-pin WSON - higher frequency, smaller inductor, but no LBI/LBO monitoring. | Lacks integrated low-battery comparator - requires external supervisor for battery state indication. | Choose when board space is constrained and battery monitoring is handled elsewhere. |
| MAX17222ETA+ | 3.3V fixed, 800nA IQ, 500mA max, 6-pin TDFN - ultra-low IQ, higher current, no shutdown-persistent LBI/LBO. | Cannot monitor battery during shutdown - unsuitable for "always-aware" battery systems. | Prefer when multi-year shelf life is paramount and low-battery alert only needed during active operation. |
Compared with LTC1474CS8#TRPBF, TPS62231DRYR offers higher switching frequency and smaller solution size but forfeits shutdown-mode battery monitoring; MAX17222ETA+ achieves nanoscale quiescent current yet omits the persistent low-battery function essential for maintenance-free remote deployments.
Availability
LTC1474CS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephony, portable instrumentation, and intrinsic safety applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1474CS8#TRPBF 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 designs precision analog, mixed-signal, and power management ICs for high-reliability industrial, automotive, and communications systems.
The LTC1474CS8#TRPBF belongs to the LTC® step-down converter family engineered for ultra-low-power battery-operated devices demanding high efficiency across wide load ranges and robust system-level supervision features.
FAQ
What is the maximum continuous output current of the LTC1474CS8#TRPBF?
The LTC1474CS8#TRPBF delivers up to 250mA continuous output current in the typical application circuit shown in the datasheet (with CDRH74-101 inductor and MBR0530 diode). Its peak switch current limit is 325–400mA depending on temperature and sense configuration, but sustained output is thermally limited to ~250mA in SOIC package at room temperature with minimal copper area.
Does the LTC1474CS8#TRPBF support adjustable output voltage?
No, the LTC1474CS8#TRPBF is a fixed 3.3V output version. Adjustable output is available only in variants such as LTC1474CS8-ADJ (orderable separately). The LTC1474CS8#TRPBF uses internal feedback resistors; connecting external dividers to Pin 1 will not alter the regulated output voltage.
Can the LTC1474CS8#TRPBF operate with input voltage lower than 3V?
No - the absolute minimum input voltage for the LTC1474CS8#TRPBF is 3V per Absolute Maximum Ratings. Operation below 3V may result in unregulated output or failure to start. For sub-3V inputs, consider the LTC3642 or other dedicated low-input buck regulators.
Is the low-battery detector functional when the LTC1474CS8#TRPBF is in shutdown mode?
Yes, the low-battery comparator remains fully operational during shutdown. The LBI pin continues to monitor the external voltage divider, and the LBO pin actively sinks current when LBI falls below 1.23V - enabling battery health monitoring without waking the main regulator.
What is the purpose of the SENSE pin on the LTC1474CS8#TRPBF?
The SENSE pin (Pin 6) connects to the source of the internal P-MOSFET and monitors switch current via an internal 5Ω sense element. When used with an external resistor between SENSE and VIN, it programs the peak current limit (e.g., 70–85mA with 1.1Ω); with pins shorted, it defaults to 325–400mA - providing overcurrent protection and optimizing inductor sizing.
LTC1474CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1474CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474CS8#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1474CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1474CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1474CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474CS8#TRPBF?
LTC1474CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474CS8#TRPBF 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#TRPBF?
For technical support, including LTC1474CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1474CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1474CS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1474CS8#TRPBF?
All LTC1474CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474CS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1474CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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