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Analog Devices Inc. LTC1475IS8#PBF
- Part No.:
- LTC1475IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1475IS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
LTC1475IS8#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with internal P-channel MOSFET switch, fixed 3.3V output, and pushbutton on/off control. It operates from 3V to 18V input, delivers up to 250mA, achieves >92% efficiency at 200mA, and draws only 6µA in shutdown - ideal for battery-powered portable instruments and wireless modems.
For engineers reviewing the LTC1475IS8#PBF datasheet, LTC1475IS8#PBF pinout, LTC1475IS8#PBF application, or LTC1475IS8#PBF equivalent, key selection criteria include its 3.3V fixed output, 8-lead SOIC package, 10µA no-load supply current, programmable peak current limit (325–400mA), and integrated low-battery detector functional during shutdown.
Technical Context
The LTC1475IS8#PBF uses Burst Mode™ operation to maintain regulation while minimizing quiescent current: it alternates short energy bursts (with 4.75µs off-time) and sleep cycles where only voltage comparator, reference, and low-battery comparator remain active. Its internal 1.4Ω PMOS switch enables 100% duty cycle for ultra-low dropout operation.
Peak inductor current is set via an optional external sense resistor (RSENSE) between SENSE and VIN pins, with trip threshold fixed at 100mV across RSENSE + 0.25Ω internal resistance; default peak current is 325mA when RSENSE = 0Ω. The LBI/OFF pin serves dual role - low-battery input and momentary-ground shutdown trigger - while ON pin enables pushbutton wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V), internally trimmed for precision without external feedback resistors. |
| Input Voltage Range | 3V to 18V - supports single-cell Li-ion, multi-cell alkaline/NiMH, and industrial 12V rails. |
| No-Load Supply Current | 10µA typical - enables multi-year battery life in always-on sensor nodes. |
| Shutdown Current | 6µA typical - maintains ultra-low power state while preserving low-battery monitoring capability. |
| Peak Switch Current Limit | 325mA minimum (RSENSE = 0Ω); programmable down to 10mA with external resistor - optimizes inductor size and ripple. |
| Switch On-Resistance | 1.4Ω typical at VIN = 10V - minimizes conduction loss in medium-current step-down applications. |
| Feedback Reference Voltage | 1.230V ±2.4% - sets output accuracy and enables adjustable versions via external divider. |
| Low-Battery Threshold | 1.23V ±3% on LBI pin - triggers open-drain LBO output even during shutdown for system-level battery management. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 150°C/W junction-to-ambient thermal resistance, rated for –40°C to 85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | Internally connected to 3.3V divider; in fixed-output version, provides regulated output and monitors regulation error. |
| LBO (Pin 2) | Low-battery open-drain output | Sinks current when LBI < 1.23V; remains active in shutdown - enables host MCU to detect battery depletion without waking regulator. |
| LBI/OFF (Pin 3) | Low-battery input / shutdown control | Dual-function pin: compares external voltage to 1.23V reference; momentary ground forces shutdown (LTC1475-specific). |
| GND (Pin 4) | Power and signal ground reference | Common return path for switch, feedback, and comparator circuits - must be low-impedance connection to minimize noise coupling. |
| 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; sets peak current limit at 100mV threshold. |
| VIN (Pin 7) | Main input supply | Accepts 3V–18V unregulated input; powers internal circuitry and supplies gate drive for PMOS switch. |
| ON (Pin 8) | Pushbutton wake-up input | Momentary ground initiates run mode (LTC1475-specific); requires 100kΩ series resistor to prevent false triggering. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at light loads by alternating short switching bursts and deep-sleep cycles - reduces average supply current to ~10µA. |
| Pushbutton on/off control | Eliminates need for external logic or microcontroller GPIO for power sequencing - ON pin wakes, LBI/OFF pin shuts down. |
| Integrated low-battery detector | Active during full operation and shutdown - provides system-level battery monitoring without additional ICs or power budget impact. |
| Programmable current limit | Adjustable peak switch current (10–400mA) via single external resistor - enables optimization for size, efficiency, and EMI in diverse load conditions. |
| 100% duty cycle capability | Supports dropout as low as VOUT – VDS(ON) - sustains regulation even when input drops near output voltage (e.g., single-cell Li-ion at end-of-discharge). |
| Few external components | Requires only inductor, Schottky diode, input/output capacitors, and optional RSENSE - reduces BOM count and PCB area vs. controller-based solutions. |
Applications
| Portable Medical Sensors | Wireless Modem Power |
|---|---|
Use Scenario: Continuous glucose monitor powered by coin-cell battery with 5-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator delivering 150mA peak to RF transceiver and analog front-end. Use Value: 10µA no-load current extends battery life; programmable 150mA current limit matches sensor burst profile; LBO signal alerts MCU before brownout. | Use Scenario: LTE-M module in asset tracker operating from 2xAA alkaline cells across -20°C to 60°C. IC Role / Device Role / Timing Role: Main 3.3V supply enabling modem sleep/wake cycles synchronized to cellular network paging intervals. Use Value: Pushbutton ON/LBI-OFF pins allow MCU-controlled power cycling; 3V–18V input range accommodates fresh-to-dead battery voltage swing. |
| Handheld Test Equipment | Intrinsic Safety Barriers |
Use Scenario: Battery-operated multimeter with backlit LCD and isolated USB interface requiring stable 3.3V rail. IC Role / Device Role / Timing Role: High-accuracy 3.3V source for ADC reference, display driver, and USB PHY - immune to input ripple from switching loads. Use Value: Fixed 3.3V output eliminates feedback resistor errors; 92% efficiency at 200mA minimizes thermal rise in sealed enclosure. | Use Scenario: Loop-powered field transmitter in hazardous area with strict 4–20mA compliance and energy limitation. IC Role / Device Role / Timing Role: Isolated auxiliary 3.3V supply derived from loop current via step-down converter - must operate below safety energy thresholds. Use Value: 6µA shutdown current ensures loop compliance during fault; programmable 10mA current limit enforces intrinsic safety energy caps. |
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 | 3MHz fixed-frequency PWM (vs. Burst Mode); 2.05V–6.5V input; 3.3V output; 300mA max; 3.5µA shutdown current. | Higher switching frequency enables smaller inductors but increases light-load inefficiency; lacks low-battery comparator and pushbutton control. | Choose for compact designs needing high-frequency operation and lower shutdown current - not for battery-monitoring or mechanical button interfaces. |
| MAX17222ETA+ | Hysteretic 500kHz step-down; 0.7V–5.5V input; 3.3V output; 300mA max; 1.3µA quiescent current; no integrated LBO or pushbutton logic. | Ultra-low IQ suits energy-harvesting, but input range excludes 12V industrial rails; no shutdown-state battery monitoring. | Prefer for sub-1V input or microwatt-energy systems - avoid when 3V–18V range, LBO signaling, or tactile power control are required. |
Compared with TPS62231DRYR and MAX17222ETA+, the LTC1475IS8#PBF uniquely combines wide-input operation (3V–18V), integrated low-battery detection active in shutdown, and true pushbutton on/off - making it irreplaceable in industrial handhelds and long-life battery systems requiring system-level power awareness.
Availability
LTC1475IS8#PBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless modems, handheld test equipment, and intrinsic safety barriers requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LTC1475IS8#PBF 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 digital signal processing technologies.
The LTC1475IS8#PBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for ultra-low-power, wide-input-range DC/DC conversion in battery-critical applications - emphasizing quiescent current, reliability, and integrated system functions like battery monitoring.
FAQ
What is the maximum continuous output current of the LTC1475IS8#PBF?
The LTC1475IS8#PBF delivers up to 250mA continuous output current at 3.3V under typical conditions (VIN = 5V–12V, TA = 25°C, proper layout). Peak switch current is programmable from 10mA to 400mA via external RSENSE, but sustained output is limited by thermal dissipation in the 8-lead SOIC package - derating is required above 70°C ambient.
Does the LTC1475IS8#PBF require an external current sense resistor?
No, the LTC1475IS8#PBF operates without an external current sense resistor - it defaults to a 325mA minimum peak switch current using its internal 0.25Ω sense element. An external resistor between SENSE and VIN pins is optional and used only to reduce peak current for lower-noise or lower-ESR capacitor designs.
How does pushbutton control work on the LTC1475IS8#PBF?
The LTC1475IS8#PBF implements pushbutton on/off via two dedicated pins: a momentary ground on ON (Pin 8) wakes the regulator from shutdown, and a momentary ground on LBI/OFF (Pin 3) forces shutdown. This eliminates external logic and allows direct mechanical switch interfacing - critical for handheld devices with tactile power management.
Is the low-battery detector active when the LTC1475IS8#PBF is in shutdown mode?
Yes, the low-battery comparator remains fully operational during shutdown - monitoring the voltage on LBI/OFF (Pin 3) against the internal 1.23V reference and asserting LBO (Pin 2) as an open-drain sink when threshold is crossed. This enables host systems to detect battery depletion without powering up the main regulator.
What is the purpose of the 100kΩ resistor required on the ON pin of the LTC1475IS8#PBF?
The 100kΩ series resistor on the ON pin prevents false triggering due to noise or leakage currents - ensuring that only a deliberate, low-impedance ground connection (e.g., mechanical switch closure) reliably initiates wake-up. It also limits inrush current during button press and protects the internal S/R latch from overvoltage transients.
LTC1475IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1475IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1475IS8#PBF 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#PBF reliable?
The price and inventory of LTC1475IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1475IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1475IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1475IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1475IS8#PBF?
LTC1475IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1475IS8#PBF 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#PBF?
For technical support, including LTC1475IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1475IS8#PBF requirements.
6.How does Aetrix verify that LTC1475IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1475IS8#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1475IS8#PBF?
All LTC1475IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1475IS8#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1475IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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