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Analog Devices Inc. LTC1474CS8-3.3#TRPBF
- Part No.:
- LTC1474CS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1474CS8-3.3#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 3.3V 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,951
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Product details
Overview
LTC1474CS8-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with an internal P-channel MOSFET switch, fixed 3.3V output, 8-pin SO package, 10µA typical no-load supply current, and 92% peak efficiency at 250mA load. It delivers regulated 3.3V power for battery-powered portable instruments and wireless modems operating from 4V to 18V input sources.
For engineers reviewing the LTC1474CS8-3.3#TRPBF datasheet, LTC1474CS8-3.3#TRPBF pinout, LTC1474CS8-3.3#TRPBF application, or LTC1474CS8-3.3#TRPBF equivalent, key selection considerations include its 3.3V fixed output, 10µA sleep-mode current, programmable current limit via external sense resistor, active-low shutdown control, and low-battery detection functional during shutdown.
Technical Context
The LTC1474CS8-3.3#TRPBF employs Burst Mode™ operation to maintain regulation while minimizing quiescent current: it alternates between short burst cycles (switch on, inductor current ramp-up, 100mV current-sense trip) and extended sleep periods (only voltage comparator and reference active). Its internal 1.4Ω PMOS switch supports up to 400mA peak current when RSENSE = 0Ω, and off-time scales from 4.75µs (regulated output) to 65µs (short-circuit condition) to ensure safe inductor discharge.
It integrates a precision 1.23V bandgap reference, a low-battery comparator (1.23V threshold) with open-drain LBO output that remains operational in shutdown, and logic-controlled RUN pin interface (ground = shutdown, open/high = run). Unlike the LTC1475 variant, it lacks pushbutton on/off functionality and uses dedicated RUN and LBI pins instead of shared LBI/OFF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.300V ±2% (3.234V–3.366V), internally trimmed for stable rail generation without external feedback resistors. |
| No-Load Supply Current | 10µA typical, enabling multi-year battery life in always-on sensor nodes and low-power standby systems. |
| Shutdown Current | 6µA typical, achieved by disabling all circuitry except 1.23V reference and low-battery comparator. |
| Switch RDS(on) | 1.4Ω typical at VIN = 10V, limiting conduction loss and supporting ≥250mA continuous output with minimal thermal rise in SO-8. |
| Peak Switch Current Limit | 325–400mA (RSENSE = 0Ω), set by internal 5Ω sense path and 100mV comparator threshold for short-circuit protection. |
| Input Voltage Range | 4V to 18V, compatible with 2-cell Li-ion (8.4V max), 3-cell alkaline (4.5V min), and industrial 12V rails. |
| Efficiency (Typical) | 92% at 250mA, VIN = 10V, VOUT = 3.3V - enables compact thermal design and reduced battery drain in portable devices. |
Pinout & Package
Package: 8-lead plastic SO (Small Outline), 150°C/W junction-to-ambient thermal resistance, RoHS-compliant, surface-mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | Internally connected to 3.3V divider; provides regulation error signal to internal comparator - no external resistors needed for fixed-output operation. |
| LBO (Pin 2) | Low-battery comparator open-drain output | Sinks current when LBI < 1.23V; requires external pull-up for system-level low-battery flag generation - remains active in shutdown. |
| LBI (Pin 3) | Low-battery comparator input | Monitors divided battery voltage; compared to 1.23V reference - enables early warning before system brownout. |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, feedback, and comparator circuits - must be low-impedance connection to minimize noise coupling. |
| SW (Pin 5) | Drain of internal P-channel MOSFET | Switching node connecting to external Schottky catch diode cathode - requires tight layout to reduce EMI and switching losses. |
| SENSE (Pin 6) | Current-sense input | Connects to optional external resistor (or shorted to VIN) to program peak switch current from 10mA to 400mA. |
| VIN (Pin 7) | Main input supply | Accepts 4V–18V unregulated input; powers internal bias circuits and gate driver - requires local 0.1µF ceramic + bulk capacitor. |
| RUN (Pin 8) | Logic-controlled enable/shutdown input | Active-high: open or >0.7V = run mode; ≤0.4V = shutdown - enables microcontroller-controlled power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at ultra-low load currents (µA range) by alternating short energy bursts with deep-sleep intervals - preserves >90% efficiency down to 1mA load. |
| 100% duty-cycle capability | Supports dropout operation down to VIN = VOUT (e.g., 3.3V out from 3.6V Li-ion) - eliminates need for LDO post-regulation in low-VIN scenarios. |
| Integrated low-battery detector | 1.23V comparator with hysteresis remains fully functional during shutdown - enables reliable battery monitoring without auxiliary circuitry. |
| Programmable current limit | Adjustable 10–400mA peak switch current via single external resistor - optimizes inductor size, ripple, and efficiency for specific load profiles. |
| Short-circuit protection | Automatic foldback triggered by SENSE pin voltage exceeding 100mV - prevents thermal runaway during output faults without external components. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor, RF transceiver, and display backlight from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator delivering up to 250mA with <10µA quiescent draw during idle/sleep states. Use Value: Extends talk time by minimizing no-load loss and maintains stable rail during burst transmission without voltage sag. | Use Scenario: Supplying microcontroller, ADC, and LCD controller in handheld multimeter or gas detector. IC Role / Device Role / Timing Role: Main system regulator converting 4×AA alkaline (6V fresh → 4V depleted) to clean 3.3V logic rail. Use Value: Enables operation down to 4V input with 100% duty cycle, while low-battery detection alerts user before measurement inaccuracy occurs. |
| Battery Chargers | Intrinsic Safety Applications |
Use Scenario: Providing isolated 3.3V bias for charger controller IC and status LEDs in USB-powered Li-ion charger. IC Role / Device Role / Timing Role: Auxiliary supply generating regulated rail independent of charging voltage (5V USB or 9–12V adapter). Use Value: Eliminates need for separate LDO; high efficiency reduces heat buildup in sealed enclosures, improving reliability. | Use Scenario: Powering explosion-proof sensor nodes in hazardous industrial zones (Class I, Div 1). IC Role / Device Role / Timing Role: Intrinsically safe DC/DC stage limiting fault energy to <100mJ using low IQ, fixed current limit, and thermal-safe SO-8 package. Use Value: Meets IEC 60079-11 requirements via inherent current limiting and sub-10µA standby draw - avoids complex safety-certified discrete designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3620ES6-3.3#TRMPBF | Higher 2MHz switching frequency, 2.5µA IQ, 6-pin TSOT-23 package, no integrated LBO/LBI comparator. | Lacks low-battery monitoring; suited for space-constrained apps where footprint matters more than system-level battery management. | Select when board area is critical and external battery monitoring is already implemented. |
| TPS62231DRYR | 3MHz sync buck, 17µA IQ, 2.5V–6V input, 3.3V fixed, no LBI/LBO, different pinout and enable polarity (active-high). | Requires external low-battery circuit; optimized for higher-frequency, lower-inductance designs but not drop-in replacement. | Choose for cost-sensitive consumer electronics where TI's ecosystem and volume pricing outweigh feature parity. |
Compared with LTC3620ES6-3.3#TRMPBF and TPS62231DRYR, the LTC1474CS8-3.3#TRPBF uniquely combines low-noise Burst Mode operation, integrated low-battery detection with shutdown persistence, and robust 4–18V input tolerance - making it optimal for industrial and medical battery systems requiring autonomous power health awareness.
Availability
LTC1474CS8-3.3#TRPBF is available at Aetrix Electronics and suitable for cellular telephony, portable instrumentation, battery chargers, and intrinsic safety applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LTC1474CS8-3.3#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, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, reliability, and energy efficiency.
The LTC1474 series was designed specifically for moderate-current (≤300mA), battery-powered systems demanding ultra-low quiescent current, wide input range, and integrated system supervision - targeting portable medical, test equipment, and ruggedized IoT endpoints.
FAQ
What is the maximum continuous output current supported by the LTC1474CS8-3.3#TRPBF?
The LTC1474CS8-3.3#TRPBF supports up to 250mA continuous output current under typical conditions (VIN = 10V, TA = 25°C, SO-8 package). Peak switch current is programmable from 10mA to 400mA via the SENSE pin resistor; however, sustained 300mA+ loads require careful thermal design due to SO-8 package limitations and 1.4Ω RDS(on).
Does the LTC1474CS8-3.3#TRPBF require external feedback resistors to regulate at 3.3V?
No, the LTC1474CS8-3.3#TRPBF does not require external feedback resistors. It features an internal resistive divider optimized for 3.3V output, connected to the VOUT/VFB (Pin 1) terminal. External resistors are only needed for adjustable-output versions like the LTC1474CS8.
Can the LTC1474CS8-3.3#TRPBF operate with input voltage as low as 3.3V?
Yes, the LTC1474CS8-3.3#TRPBF supports 100% duty-cycle operation, allowing it to maintain regulation with VIN as low as VOUT (3.3V). However, the absolute minimum specified input is 4V per the datasheet's recommended operating conditions - operation below 4V may result in reduced current capability or instability depending on load and layout.
How does the low-battery detector function during shutdown mode of the LTC1474CS8-3.3#TRPBF?
The low-battery detector remains fully active during shutdown: the internal 1.23V reference and comparator continue operating, and the LBO (Pin 2) output will sink current whenever the voltage at LBI (Pin 3) falls below the 1.23V threshold - enabling system-level battery monitoring even when the main regulator is disabled.
What is the purpose of the SENSE pin (Pin 6) on the LTC1474CS8-3.3#TRPBF?
The SENSE pin (Pin 6) serves as the current-sense input for the internal peak-current comparator. When connected to VIN via an optional resistor (RSENSE), it programs the maximum switch current from 10mA to 400mA; if shorted directly to VIN (RSENSE = 0Ω), it defaults to ~325–400mA for short-circuit protection and optimized light-load efficiency in the LTC1474CS8-3.3#TRPBF.
LTC1474CS8-3.3#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC1474CS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474CS8-3.3#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 LTC1474CS8-3.3#TRPBF reliable?
The price and inventory of LTC1474CS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1474CS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1474CS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474CS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474CS8-3.3#TRPBF?
LTC1474CS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474CS8-3.3#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 LTC1474CS8-3.3#TRPBF?
For technical support, including LTC1474CS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474CS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1474CS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1474CS8-3.3#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 LTC1474CS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1474CS8-3.3#TRPBF?
All LTC1474CS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474CS8-3.3#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 LTC1474CS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1474CS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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