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Analog Devices Inc. LTC1475IS8#TRPBF
- Part No.:
- LTC1475IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1475IS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,176
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Product details
Overview
LTC1475IS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with integrated P-channel MOSFET, 3.3V fixed output, 8-lead SOIC package, and pushbutton on/off control. It delivers up to 300mA output current, achieves >92% efficiency at 250mA, operates from 3V to 18V input, and draws only 6µA in shutdown - ideal for battery-powered portable instruments and wireless modems.
For engineers reviewing the LTC1475IS8#TRPBF datasheet, LTC1475IS8#TRPBF pinout, LTC1475IS8#TRPBF application, or LTC1475IS8#TRPBF equivalent, key selection considerations include its 3.3V fixed output, programmable peak current limit (325–400mA), 100% duty-cycle low-dropout capability, industrial temperature range (–40°C to 85°C), and pushbutton-controlled run/shutdown functionality unique to the LTC1475 variant.
Technical Context
The LTC1475IS8#TRPBF uses Burst Mode™ operation to maintain regulation while minimizing no-load supply current to 10µA typical. Its internal 1.4Ω PMOS switch, 1.23V reference, and 100mV current-sense threshold enable precise peak-current limiting via external RSENSE or default 325mA trip when pins 6–7 are shorted.
It integrates a low-battery comparator (LBI/LBO) functional during shutdown, pushbutton-triggered S/R latch for ON/OFF control (LBI/OFF and ON pins), and 4.75µs minimum off-time that extends to 65µs under short-circuit conditions - ensuring safe inductor current decay across operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V); regulated by internal 1.23V reference and precision resistive divider. |
| Input Voltage Range | 3V to 18V; supports wide battery chemistries including multi-cell Li-ion, alkaline, and NiMH packs. |
| Max Output Current | 300mA continuous; limited by internal 1.4Ω switch RDS(ON) and thermal design in SOIC package. |
| No-Load Supply Current | 10µA typical; enables multi-year battery life in always-on sensor nodes or standby systems. |
| Shutdown Current | 6µA typical; low-battery comparator remains active, allowing system-level battery monitoring without wake-up. |
| Peak Switch Current Limit | 325–400mA (RSENSE = 0Ω); programmable down to ~10mA using external sense resistor for ultra-low-noise designs. |
| Efficiency | >92% at 250mA, VIN = 5V → 3.3V; optimized via Burst Mode™ and minimal gate drive losses. |
| Operating Temperature | –40°C to +85°C (Industrial grade); validated across full range with guaranteed VFB, IPEAK, and tOFF performance. |
Pinout & Package
Package: 8-lead plastic SOIC (Small Outline Integrated Circuit), 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 feedback node | Internal resistive divider sets 3.3V output; connects to output capacitor for regulation; no external components required for fixed version. |
| LBO (Pin 2) | Low-battery open-drain output | Sinks current when LBI < 1.23V; drives LED or microcontroller interrupt; remains active in shutdown mode. |
| LBI/OFF (Pin 3) | Low-battery input / shutdown trigger | Dual-function pin: compares input voltage to 1.23V reference; momentary ground initiates shutdown (LTC1475 only). |
| GND (Pin 4) | Power and signal ground reference | Common return path for switch, sense, feedback, and comparator circuits; requires low-impedance PCB connection. |
| SW (Pin 5) | Switch node | Drain of internal PMOS power switch; connects directly to cathode of external Schottky catch diode and inductor. |
| SENSE (Pin 6) | Current sense input | Monitors switch current via internal 5Ω resistor plus optional external RSENSE; trips at 100mV to limit peak current. |
| VIN (Pin 7) | Main input supply | Accepts 3V–18V; powers internal circuitry and switch gate driver; requires local 0.1µF ceramic decoupling. |
| ON (Pin 8) | Pushbutton run trigger | Momentary ground initiates run mode (LTC1475 only); requires 100kΩ series resistor to prevent false triggering. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at light loads with 10µA no-load current, enabling multi-year battery life in intermittent-use devices. |
| Pushbutton on/off control | Eliminates need for external logic or microcontroller GPIO for power sequencing - reduces BOM count and firmware complexity. |
| 100% duty-cycle capability | Supports dropout operation down to VIN = VOUT, critical for maintaining output during battery voltage sag near end-of-life. |
| Integrated low-battery detector | Active during shutdown with 1.23V threshold and 5mV hysteresis; provides reliable battery monitoring without additional ICs. |
| Programmable current limit | Adjustable from ~10mA to 400mA via single external resistor; optimizes inductor size, ripple, and noise for specific load requirements. |
| Industrial temperature grade | Specified from –40°C to +85°C with guaranteed electrical performance; suitable for automotive accessory, industrial sensor, and outdoor equipment. |
Applications
| Portable Medical Sensors | Wireless Modem Power |
|---|---|
Use Scenario: Battery-powered pulse oximeter with Bluetooth LE transmission every 30 seconds. IC Role / Device Role / Timing Role: Primary 3.3V supply for MCU, analog front-end, and RF transceiver; manages deep-sleep current budget. Use Value: 6µA shutdown current extends CR2032 coin cell life beyond 2 years; Burst Mode™ ensures fast wake-up without output droop. | Use Scenario: LTE-M module in smart utility meter requiring low-power wake/sleep cycling. IC Role / Device Role / Timing Role: Step-down regulator powering baseband processor and cellular radio; interfaces with host MCU for power-state coordination. Use Value: Pushbutton ON pin allows host MCU to initiate power-up after tamper detection; LBO output signals battery replacement need before communication failure. |
| Handheld Test Equipment | Industrial Data Logger |
Use Scenario: Pocket-sized multimeter with auto-ranging and LCD backlight. IC Role / Device Role / Timing Role: Main 3.3V rail for microcontroller, ADC, and display driver; handles dynamic load steps from backlight activation. Use Value: 1.4Ω internal switch and 100% duty cycle sustain 3.3V output even as 4xAA alkaline pack drops from 6.4V to 4.0V; low ESR output cap minimizes ripple during digit updates. | Use Scenario: Remote environmental monitor powered by solar-charged LiFePO₄ battery. IC Role / Device Role / Timing Role: Primary regulator for ultra-low-power MCU, temperature/humidity sensor, and LoRaWAN transceiver. Use Value: Programmable current limit (set to 50mA) reduces inductor size and EMI; LBI/OFF pin used for manual shutdown during maintenance without removing battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1475CS8#PBF | Same silicon, Commercial grade (0°C to 70°C) vs Industrial (–40°C to 85°C); identical electrical specs and pinout. | Not suitable for extended temperature environments such as outdoor enclosures or vehicle-mounted sensors. | Select LTC1475IS8#TRPBF when operating ambient exceeds 70°C or falls below 0°C; otherwise LTC1475CS8#PBF offers cost advantage. |
| TPS62231DRYR | 3MHz fixed-frequency PWM (vs Burst Mode™); 2.05V–6.5V input; 3.3V output; 300mA; 2.5µA shutdown current; 6-pin WSON. | Higher switching frequency enables smaller inductors/caps but lacks pushbutton control and low-battery comparator. | Choose TPS62231DRYR for space-constrained designs needing higher frequency; retain LTC1475IS8#TRPBF when battery monitoring, pushbutton power control, or wide VIN are required. |
Compared with LTC1475CS8#PBF, the LTC1475IS8#TRPBF adds guaranteed performance over –40°C to 85°C and tape-and-reel packaging for automated assembly; versus TPS62231DRYR, it trades higher-frequency PWM for superior light-load efficiency, integrated battery sensing, and mechanical power control - making it better suited for long-life, feature-rich portable instrumentation.
Availability
LTC1475IS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless modems, handheld test equipment, and industrial data loggers requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade performance.
Supply support for LTC1475IS8#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to strengthen its power management portfolio.
The LTC1475IS8#TRPBF belongs to the LTC®1474/LTC1475 family of micropower step-down converters designed specifically for battery-operated systems demanding ultra-low quiescent current, robust shutdown control, and integrated system monitoring functions.
FAQ
What is the maximum input voltage rating for the LTC1475IS8#TRPBF?
The LTC1475IS8#TRPBF has an absolute maximum input voltage rating of 20V, but its recommended operating range is 3V to 18V. Exceeding 18V may cause premature device stress or reduced reliability, especially at elevated temperatures. The internal protection circuitry does not include overvoltage clamping, so external TVS or regulator pre-conditioning is advised if transient surges above 18V are possible in the application.
Does the LTC1475IS8#TRPBF require an external current sense resistor?
No, the LTC1475IS8#TRPBF does not require an external current sense resistor. When pins 6 (SENSE) and 7 (VIN) are shorted, the device defaults to a 325–400mA peak current limit using its internal 5Ω sense element. An external resistor is optional and used only to reduce the current limit for lower-noise or lower-power applications - for example, a 1.1Ω resistor sets IPEAK ≈ 70–85mA.
How does the pushbutton on/off function work on the LTC1475IS8#TRPBF?
The LTC1475IS8#TRPBF uses two dedicated pins for mechanical power control: a momentary ground on Pin 8 (ON) sets the internal S/R latch to run mode, and a momentary ground on Pin 3 (LBI/OFF) resets it to shutdown. Both actions require a 100kΩ series resistor to prevent false triggering. This eliminates the need for external logic or firmware-based power sequencing, making it ideal for simple, reliable handheld product designs.
Can the LTC1475IS8#TRPBF operate with 100% duty cycle, and what is its significance?
Yes, the LTC1475IS8#TRPBF supports 100% duty cycle operation, meaning the internal PMOS switch remains continuously on when VIN approaches VOUT. This enables low-dropout regulation critical for maintaining stable 3.3V output as battery voltage declines - for example, sustaining operation down to VIN = 3.3V from a depleting 3-cell alkaline pack. Unlike many buck regulators, this avoids dropout-induced reset or brownout in battery-powered systems.
Is the low-battery detector in the LTC1475IS8#TRPBF active during shutdown mode?
Yes, the low-battery comparator in the LTC1475IS8#TRPBF remains fully functional during shutdown mode, drawing only 6µA total supply current. Pin 3 (LBI/OFF) continues to monitor the divided battery voltage against the internal 1.23V reference, and Pin 2 (LBO) actively sinks current when the threshold is crossed - enabling system-level battery status reporting even when the main load is powered off.
LTC1475IS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1475IS8#TRPBF FAQ
1.How can I place an order for LTC1475IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1475IS8#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 LTC1475IS8#TRPBF reliable?
The price and inventory of LTC1475IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1475IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1475IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1475IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1475IS8#TRPBF?
LTC1475IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1475IS8#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 LTC1475IS8#TRPBF?
For technical support, including LTC1475IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1475IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1475IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1475IS8#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 LTC1475IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1475IS8#TRPBF?
All LTC1475IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1475IS8#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 LTC1475IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1475IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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