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Analog Devices Inc. LTC1475CS8-5#TRPBF
- Part No.:
- LTC1475CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1475CS8-5#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 5V 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,324
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Product details
Overview
LTC1475CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a 5V fixed-output, high-efficiency step-down DC/DC converter with internal P-channel MOSFET switch, 10µA typical no-load quiescent current, 92% peak efficiency at 250mA, and pushbutton on/off control. It operates from 3V to 18V input and delivers up to 300mA output in an 8-lead SO package for battery-powered portable instrumentation.
For engineers reviewing the LTC1475CS8-5#TRPBF datasheet, LTC1475CS8-5#TRPBF pinout, LTC1475CS8-5#TRPBF application, or LTC1475CS8-5#TRPBF equivalent, key selection criteria include its 5V fixed output, 10µA shutdown current, programmable current limit (325–400mA), 1.4Ω internal switch RDS(ON), and pushbutton-controlled run/shutdown functionality.
Technical Context
The LTC1475CS8-5#TRPBF uses 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 sleep cycles (only voltage comparator, reference, and low-battery detector active). Its internal 1.23V reference compares against VFB (Pin 1) to regulate output, and the LBI/OFF pin (Pin 3) serves dual roles-low-battery input and momentary-ground shutdown trigger.
Unlike the LTC1474, the LTC1475CS8-5#TRPBF implements pushbutton on/off via an internal S/R flip-flop: grounding Pin 8 (ON) initiates run mode; grounding Pin 3 (LBI/OFF) initiates shutdown. The 4.75µs off-time is dynamically extended up to 65µs under low-VOUT or short-circuit conditions to ensure inductor current decay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.000 V ±2% (guaranteed over load, line, temp) |
| Input Voltage Range | 3V to 18V - supports single-cell Li-ion, multi-cell alkaline, and wide industrial rails |
| No-Load Supply Current | 10 µA typical - enables multi-year battery life in standby |
| Shutdown Current | 6 µA typical - maintains ultra-low power state with LBO comparator still active |
| Peak Switch Current | 325–400 mA (RSENSE = 0 Ω) - sets max inductor current for size/noise optimization |
| Internal Switch RDS(ON) | 1.4 Ω typical at VIN = 10V - determines conduction loss and thermal rise at full load |
| Feedback Reference | 1.230 V ±2.4% - defines regulation accuracy and divider ratio for adjustable variants |
Pinout & Package
Package: 8-lead plastic SO (Small Outline), 150°C/W junction-to-ambient thermal resistance, RoHS-compliant, tape-and-reel (TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | Internally connected to 5V output divider; provides 1.23V reference comparison point |
| LBO (Pin 2) | Low-battery open-drain output | Sinks up to 0.7 mA when LBI < 1.23V; remains functional in shutdown |
| LBI/OFF (Pin 3) | Dual-function input: low-battery threshold & shutdown trigger | Momentary ground forces shutdown; otherwise monitors battery voltage vs 1.23V ref |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, sense, feedback, and comparator circuits |
| SW (Pin 5) | Drain of internal P-MOSFET power switch | Connects directly to cathode of external Schottky catch diode |
| SENSE (Pin 6) | Current-sense input terminal | Monitors voltage across internal + optional external resistor to limit peak switch current |
| VIN (Pin 7) | Main input supply connection | Accepts 3V–18V; powers internal circuitry and charges switch gate |
| ON (Pin 8) | Pushbutton run-mode enable | Momentary ground sets internal S/R latch to activate regulator; requires 100kΩ series resistor |
Key Features
| Feature | Design Value |
|---|---|
| Pushbutton On/Off Control | Eliminates need for external logic or microcontroller GPIO to manage power sequencing in handheld devices |
| Burst Mode™ Operation | Maintains >85% efficiency down to 1mA load by dynamically gating switch activity and minimizing bias current |
| 100% Duty Cycle Capability | Enables dropout-free operation when VIN approaches VOUT, critical for end-of-battery-life support |
| Programmable Current Limit | Adjusts peak switch current from 325mA to 70mA using optional RSENSE, optimizing inductor size and EMI |
| Active Low-Battery Detection in Shutdown | Allows system-level battery monitoring without waking main regulator - reduces system-level quiescent overhead |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor and RF front-end from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary 5V step-down regulator with pushbutton-initiated power-on and low-battery warning signaling. Use Value: 10µA no-load current extends standby time beyond 30 days; 92% efficiency at 200mA minimizes heat in sealed enclosures. | Use Scenario: Supplying 5V to microcontroller, ADC, and LCD backlight in handheld multimeter. IC Role / Device Role / Timing Role: Main system regulator with manual power toggle and battery health monitoring via LBO pin. Use Value: Pushbutton control eliminates dedicated power button circuitry; LBI/OFF dual function reduces BOM count by one external component. |
| Battery Chargers | Intrinsic Safety Applications |
Use Scenario: Generating regulated 5V bias for charging IC control logic in USB-powered smart battery packs. IC Role / Device Role / Timing Role: Isolated auxiliary supply enabling charger enable/disable and status reporting during charging cycle. Use Value: 6µA shutdown current prevents parasitic drain on protected battery cells; 18V max input accommodates USB PD negotiation spikes. | Use Scenario: Powering intrinsically safe sensor interface circuits in hazardous industrial zones (Class I, Div 1). IC Role / Device Role / Timing Role: Certified low-power, fault-tolerant 5V supply with short-circuit protection and current limiting. Use Value: Built-in short-circuit protection and 400mA current limit simplify safety certification; 1.4Ω RDS(ON) ensures predictable fault energy dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1475CMS8-5 | Same electrical specs, but in 8-lead MSOP package (110°C/W θJA) vs SO (150°C/W); smaller footprint, better thermal performance | Preferred for space-constrained PCBs where thermal margin is critical | Select CMS8 if board area is limited and thermal design allows tighter layout; verify MSOP soldering process capability |
| TPS62231DRYR | 5V fixed output, 2.05V–6.5V input, 20µA IQ, 3MHz switching, no pushbutton control, different pinout | Lacks dual-function LBI/OFF and ON pins; requires external enable logic for on/off sequencing | Choose for higher-frequency, smaller-inductor designs where pushbutton control is unnecessary and input range is narrower |
Compared with LTC1475CMS8-5, the LTC1475CS8-5#TRPBF offers lower thermal resistance margin in larger SO packages but requires more board area; compared with TPS62231DRYR, it provides integrated mechanical power control and wider input range at the cost of lower switching frequency and larger magnetics.
Availability
LTC1475CS8-5#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, and battery chargers requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC1475CS8-5#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC1475CS8-5#TRPBF belongs to the LTC1474/LTC1475 family of micropower step-down converters designed specifically for moderate-current (≤300mA), battery-operated systems demanding ultra-low quiescent current and mechanical simplicity.
FAQ
What is the maximum continuous output current of the LTC1475CS8-5#TRPBF?
The LTC1475CS8-5#TRPBF supports up to 300mA continuous output current under typical thermal conditions (TA = 25°C, SO package, no airflow). Peak switch current is programmable from 325mA (RSENSE = 0Ω) down to 70mA (RSENSE = 1.1Ω), and actual deliverable current depends on input voltage, ambient temperature, PCB copper area, and inductor saturation rating. Derating is required above 70°C ambient.
Does the LTC1475CS8-5#TRPBF require an external current sense resistor?
No, the LTC1475CS8-5#TRPBF does not require an external current sense resistor. With Pins 6 (SENSE) and 7 (VIN) shorted, it defaults to a 325–400mA peak current limit using its internal 0.25Ω sense element. An external resistor (e.g., 0.33Ω to 1.1Ω) is optional and used only to reduce peak current for lower-noise or smaller-inductor designs.
How does pushbutton control work on the LTC1475CS8-5#TRPBF?
The LTC1475CS8-5#TRPBF implements pushbutton on/off via two dedicated pins: grounding Pin 8 (ON) for ≥10ms initiates run mode; grounding Pin 3 (LBI/OFF) for ≥10ms initiates shutdown mode. Both actions toggle an internal S/R latch, and the pins retain their low-battery comparator function when not actively grounded - no external debouncing or logic is needed.
Can the LTC1475CS8-5#TRPBF operate with input voltage below 3V?
No, the LTC1475CS8-5#TRPBF has a minimum specified input voltage of 3V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3V is not guaranteed: the internal reference, gate drive, and comparator circuits may fail to start or regulate. For sub-3V inputs, consider the LTC3642 or LTC3631 families, which support down to 2.5V or 1.8V respectively.
What is the purpose of the LBO pin on the LTC1475CS8-5#TRPBF?
The LBO (Low Battery Output) pin on the LTC1475CS8-5#TRPBF is an open-drain N-channel MOSFET output that sinks current when the voltage on the LBI/OFF pin falls below the internal 1.23V reference. It remains fully functional during shutdown mode, enabling external circuitry (e.g., MCU GPIO or LED driver) to monitor battery health without powering the main regulator - a key feature for ultra-low-power wake-up architectures.
LTC1475CS8-5#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):
- 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
LTC1475CS8-5#TRPBF FAQ
1.How can I place an order for LTC1475CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1475CS8-5#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 LTC1475CS8-5#TRPBF reliable?
The price and inventory of LTC1475CS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1475CS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1475CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1475CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1475CS8-5#TRPBF?
LTC1475CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1475CS8-5#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 LTC1475CS8-5#TRPBF?
For technical support, including LTC1475CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1475CS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC1475CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1475CS8-5#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 LTC1475CS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1475CS8-5#TRPBF?
All LTC1475CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1475CS8-5#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 LTC1475CS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1475CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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