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Analog Devices Inc. LTC1475CS8#TRPBF
- Part No.:
- LTC1475CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1475CS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,074
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Product details
Overview
LTC1475CS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with integrated P-channel MOSFET, designed for battery-powered systems requiring stable 3.3V output at up to 250mA. It features 10µA typical no-load supply current, 92% peak efficiency at 250mA, 3V–18V input range, and pushbutton on/off control via dedicated ON and LBI/OFF pins.
For engineers reviewing the LTC1475CS8#TRPBF datasheet, LTC1475CS8#TRPBF pinout, LTC1475CS8#TRPBF application, or LTC1475CS8#TRPBF equivalent, this page delivers verified technical context, exact pin functions, real-world load regulation (±15mV), confirmed 8-lead SO package mapping, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The LTC1475CS8#TRPBF implements Burst Mode™ operation to sustain high efficiency across light-to-moderate loads: it alternates short energy bursts (with 4.75µs fixed off-time) and ultra-low-power sleep cycles (9µA typical), enabling >90% efficiency even at 1mA load. Its internal current comparator monitors switch current via SENSE pin using a 100mV threshold, supporting programmable peak current from 70mA to 400mA via external RSENSE.
Unlike the LTC1474, the LTC1475CS8#TRPBF integrates an S/R flip-flop for true pushbutton on/off functionality-momentary ground on ON (Pin 8) initiates run mode; momentary ground on LBI/OFF (Pin 3) triggers shutdown-while maintaining active low-battery detection (1.23V reference, ±5mV hysteresis) during shutdown. The 1.23V feedback reference enables precise 3.3V regulation (±2.2% over temperature) via internal resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.2% over full temperature range; regulated by internal 1.23V reference and precision divider. |
| Input Voltage Range | 3V to 18V; supports single-cell Li-ion, multi-cell alkaline/NiMH, and industrial 12V rails without external regulators. |
| No-Load Supply Current | 10µA typical; enables multi-year battery life in always-on sensor nodes and standby circuits. |
| Peak Efficiency | 92% at 250mA, VIN = 10V, VOUT = 3.3V; achieved via low RDS(ON) (1.4Ω typ) and optimized Burst Mode timing. |
| Switch Off-Time | 4.75µs nominal (extends to 65µs under short-circuit); ensures safe inductor current decay and robust fault handling. |
| Low-Battery Detection | Active during shutdown; 1.23V threshold with 5mV hysteresis on LBI/OFF pin enables reliable end-of-life battery signaling. |
| Shutdown Current | 6µA typical; only low-battery comparator and reference remain active, preserving battery charge. |
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) | Feedback input / regulated output | Internal resistive divider sets 3.3V; connects to output capacitor for closed-loop regulation. |
| LBO (Pin 2) | Open-drain low-battery output | Sinks up to 0.7mA when LBI/OFF voltage falls below 1.23V; drives LED or microcontroller interrupt. |
| LBI/OFF (Pin 3) | Low-battery input / shutdown control | Dual-function pin: compares input to 1.23V reference; momentary ground forces shutdown. |
| GND (Pin 4) | Power and signal ground | Common return for switch, feedback, and comparator circuits; must be low-impedance PCB plane. |
| SW (Pin 5) | Switch node | Drain of internal P-MOSFET; requires direct connection to Schottky diode cathode and inductor. |
| SENSE (Pin 6) | Current sense input | Monitors switch current via internal 5Ω + optional external resistor; trips at 100mV for cycle-by-cycle limiting. |
| VIN (Pin 7) | Main power input | Accepts 3V–18V; supplies gate drive and internal circuitry; requires 0.1µF ceramic + bulk capacitor. |
| ON (Pin 8) | Pushbutton run control | Momentary ground initiates run mode; requires 100kΩ series resistor to prevent false triggering. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains >90% efficiency from 1mA to 250mA load by dynamically alternating burst cycles and 9µA sleep states. |
| Pushbutton on/off control | Eliminates need for external logic or microcontroller GPIO control; ON and LBI/OFF pins support tactile switch interface. |
| Programmable peak current limit | Adjustable from 70mA to 400mA via RSENSE; optimizes inductor size, ripple, and EMI for specific load profiles. |
| 100% duty cycle capability | Enables dropout operation down to VIN = VOUT; critical for battery applications where input voltage decays near output level. |
| Active low-battery detection in shutdown | Preserves system awareness of battery state while consuming only 6µA; enables graceful shutdown sequencing. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single Li-ion cell (3.0V–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator with pushbutton power management and battery monitoring. Use Value: Extends talk time via 10µA quiescent current and maintains >90% efficiency across discharge curve. |
Use Scenario: Supplying ADC, microcontroller, and LCD backlight in handheld multimeter or data logger. IC Role / Device Role / Timing Role: Main system regulator with low-noise output and integrated low-battery warning. Use Value: Enables accurate measurements by minimizing output ripple (<50mVP-P) and providing stable 3.3V under varying load. |
| Battery-Operated Digital Devices | Intrinsic Safety Applications |
Use Scenario: Powering Bluetooth LE module and sensors in wireless asset tracker operating on two AA cells. IC Role / Device Role / Timing Role: High-efficiency 3.3V source with micropower shutdown and wake-on-button capability. Use Value: Achieves 5+ year battery life via 6µA shutdown current and eliminates external power-control ICs. |
Use Scenario: Providing certified 3.3V rail in explosion-proof gas detector with strict current-limiting requirements. IC Role / Device Role / Timing Role: Intrinsically safe power converter with programmable 70mA–400mA current limit and short-circuit protection. Use Value: Meets IEC 60079-11 energy limits without external current-sense amplifiers or fuses. |
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#TRPBF | Same electrical specs but 8-lead MSOP package (110°C/W θJA vs 150°C/W); smaller footprint, better thermal performance. | Preferred for space-constrained PCBs; requires re-layout due to different pad geometry and thermal pad. | Select when board area is limited and thermal margin must exceed SO-package capability. |
| TPS62231DRYR | 3MHz fixed-frequency PWM (vs Burst Mode); 20µA IQ; 2.05V–6.5V input; 3.3V output; 300mA max. | Better suited for noise-sensitive analog circuits; lacks pushbutton control and low-battery comparator. | Choose for higher switching frequency, tighter output tolerance (±1%), and absence of burst-mode ripple. |
Compared with LTC1475CS8#TRPBF, the LTC1475CMS8#TRPBF offers identical functionality in a thermally superior MSOP package, while the TPS62231DRYR trades Burst Mode efficiency at light loads for lower noise and higher frequency-but omits integrated battery monitoring and pushbutton control essential for portable systems.
Availability
LTC1475CS8#TRPBF 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 guaranteed traceability.
Supply support for LTC1475CS8#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 all Linear power management ICs.
The LTC1475CS8#TRPBF belongs to Linear's legacy high-efficiency, low-IQ DC/DC converter family, engineered specifically for battery-powered portable electronics demanding extended runtime, pushbutton power control, and integrated system monitoring.
FAQ
What is the maximum continuous output current of the LTC1475CS8#TRPBF?
The LTC1475CS8#TRPBF delivers up to 250mA continuous output current at 3.3V with VIN = 10V, as validated in the Typical Application circuit (Figure 1). Peak switch current is programmable from 70mA to 400mA via RSENSE, but sustained 250mA operation requires proper thermal design and inductor selection per the datasheet's LMIN equation.
Does the LTC1475CS8#TRPBF require an external current sense resistor?
No-the LTC1475CS8#TRPBF defaults to 400mA peak current when Pins 6 (SENSE) and 7 (VIN) are shorted, using its internal 5Ω sense element. An external RSENSE is optional and used only to reduce peak current for lower-noise or lower-ESR designs; values from 0Ω to 10Ω adjust IPEAK from 400mA down to 70mA.
How does pushbutton control work on the LTC1475CS8#TRPBF?
The LTC1475CS8#TRPBF uses two dedicated pins: ON (Pin 8) and LBI/OFF (Pin 3). A momentary ground on ON initiates run mode; a momentary ground on LBI/OFF forces shutdown. Both actions toggle an internal S/R latch, enabling true hardware-based power sequencing without firmware involvement.
Can the LTC1475CS8#TRPBF operate with input voltage equal to output voltage?
Yes-the LTC1475CS8#TRPBF supports 100% duty cycle operation, allowing VIN to drop to 3.3V (or slightly below, accounting for dropout) while maintaining regulation. This low-dropout capability is critical for battery-powered systems where input voltage decays near the output level during discharge.
Is the low-battery detector active when the LTC1475CS8#TRPBF is in shutdown?
Yes-the low-battery comparator remains fully operational during shutdown, drawing only 6µA total device current. The LBI/OFF pin continues to monitor the external voltage divider, and LBO (Pin 2) will sink current if the threshold (1.23V ±5mV) is crossed, enabling system-level battery management even when the main regulator is off.
LTC1475CS8#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
LTC1475CS8#TRPBF FAQ
1.How can I place an order for LTC1475CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1475CS8#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#TRPBF reliable?
The price and inventory of LTC1475CS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1475CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1475CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1475CS8#TRPBF?
LTC1475CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1475CS8#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#TRPBF?
For technical support, including LTC1475CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1475CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1475CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1475CS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1475CS8#TRPBF?
All LTC1475CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1475CS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1475CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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