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Analog Devices Inc. LTC1475CMS8-3.3#TRPBF
- Part No.:
- LTC1475CMS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1475CMS8-3.3#TRPBF.pdf
- Description:
- IC REG BUCK BST 3.3V 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,112
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Product details
Overview
LTC1475CMS8-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with integrated P-channel MOSFET, fixed 3.3V output, 8-lead MSOP package, 10µA typical no-load supply current, and pushbutton on/off control. It delivers up to 250mA at 3.3V from 4V–18V input for battery-powered portable instrumentation.
For engineers reviewing the LTC1475CMS8-3.3#TRPBF datasheet, LTC1475CMS8-3.3#TRPBF pinout, LTC1475CMS8-3.3#TRPBF application, or LTC1475CMS8-3.3#TRPBF equivalent, key selection factors include its 92% peak efficiency at 250mA, programmable current limit (325–400mA), 100% duty-cycle low-dropout operation, active-low micropower shutdown (6µA), and integrated low-battery detector functional during shutdown.
Technical Context
The LTC1475CMS8-3.3#TRPBF uses Burst Mode™ operation to maintain regulation while minimizing quiescent current: short energy bursts charge the output capacitor, followed by sleep cycles drawing only 9µA. Its internal 1.4Ω PMOS switch enables high efficiency across 4V–18V input range with fixed 3.3V output set by internal resistor divider.
It features dual-function LBI/OFF pin (low-battery input + momentary shutdown trigger), ON pin for pushbutton wake-up, and SENSE pin for external current-limit programming via resistor to VIN. The 4.75µs off-time scales up to 65µs under short-circuit conditions to ensure inductor current decay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.300V ±2% (3.234V–3.366V) - tightly regulated for logic supply rails |
| Input Voltage Range | 4V to 18V - supports single Li-ion, multi-cell alkaline, or industrial 12V rails |
| No-Load Supply Current | 10µA typical - enables multi-year battery life in standby sensor nodes |
| Shutdown Current | 6µA typical - lowest power state retains low-battery monitoring capability |
| Peak Switch Current | 325mA minimum (RSENSE = 0Ω) - sets max inductor current for 250mA load design margin |
| Switch On-Resistance | 1.4Ω typical at VIN = 10V - determines conduction loss and thermal rise at full load |
| Feedback Reference | 1.230V ±2.4% - internal precision bandgap used for output voltage accuracy |
| Efficiency (250mA) | 92% typical at VIN = 5V - minimizes heat generation and extends battery runtime |
Pinout & Package
Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | Internally connected to 3.3V divider; monitors regulation and triggers burst mode sleep/wake |
| LBO (Pin 2) | Low-battery open-drain output | Sinks current when LBI < 1.23V; drives LED or microcontroller interrupt without pull-up |
| LBI/OFF (Pin 3) | Low-battery input / shutdown control | Dual-function: comparator input (1.23V threshold) and momentary ground-triggered shutdown |
| GND (Pin 4) | Power and signal reference | Common return for switch, feedback, and comparator circuits; requires low-impedance PCB plane |
| SW (Pin 5) | PMOS switch drain | Connects directly to Schottky diode cathode and inductor; carries high di/dt switching current |
| SENSE (Pin 6) | Current-sense input | Programs peak switch current via resistor to VIN; defaults to 325mA if shorted to VIN |
| VIN (Pin 7) | Main power input | Accepts 4V–18V; supplies gate drive and internal circuitry; requires local 0.1µF ceramic decoupling |
| ON (Pin 8) | Pushbutton wake-up input | Momentary ground initiates run mode; requires 100kΩ series resistor to prevent false triggering |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at light loads with 9µA sleep current-enables >10-year coin-cell life in IoT sensors |
| 100% duty-cycle capability | Supports dropout as low as VIN – VOUT ≈ 0V-critical for end-of-battery-life operation in 3.3V systems |
| Integrated low-battery detector | Remains active in shutdown with 1.23V threshold-allows system-level battery monitoring without external IC |
| Pushbutton on/off control | Eliminates need for external power sequencer or microcontroller GPIO for user power management |
| Short-circuit protection | Auto-recovering current limiting via SENSE pin-prevents damage during output fault without latch-up |
| Few external components | Requires only inductor, Schottky diode, input/output capacitors-reduces BOM count and board area |
Applications
| Portable Medical Sensors | Wireless Modem Power |
|---|---|
Use Scenario: Battery-powered pulse oximeter with Bluetooth LE transmission. IC Role / Device Role / Timing Role: Primary 3.3V supply for MCU, analog front-end, and RF transceiver. Use Value: 10µA quiescent current extends AAA battery life to >3 years in sleep mode; 92% efficiency at 250mA peak RF transmit current minimizes thermal stress. | Use Scenario: Cellular LTE-M module in remote asset tracker. IC Role / Device Role / Timing Role: Step-down regulator converting 3.7V Li-ion to stable 3.3V for modem and GPS. Use Value: 100% duty cycle sustains operation down to 3.4V cell voltage; pushbutton ON control enables user-initiated wake-up without host processor involvement. |
| Handheld Test Instruments | Intrinsic Safety Barriers |
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. Use Value: Low 6µA shutdown current preserves battery during storage; programmable current limit (via SENSE) prevents overcurrent during backlight surge. | Use Scenario: IS-certified field transmitter powering 4–20mA loop electronics. IC Role / Device Role / Timing Role: Isolated 3.3V supply derived from loop power via auxiliary winding. Use Value: Internal low-battery detector (active in shutdown) signals loop degradation before failure; minimal external parts reduce explosion-risk component count. |
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; 20µA IQ; 300mA output | Higher switching frequency allows smaller inductors but higher light-load IQ; no integrated low-battery monitor | Choose for compact size and predictable EMI profile where ultra-low IQ is secondary |
| MAX17222ELT+T | 1.8V–5.5V input; 300mA output; 0.9µA IQ; no LBO/LBI pins; no pushbutton control | Ultra-low IQ ideal for energy-harvesting, but lacks battery monitoring and user power control functions | Choose for sub-1µA standby in maintenance-free sensor nodes where battery status is externally managed |
Compared with TPS62231DRYR and MAX17222ELT+T, the LTC1475CMS8-3.3#TRPBF uniquely combines micropower Burst Mode operation, integrated low-battery detection with shutdown retention, and pushbutton on/off-making it optimal for handheld devices requiring long battery life *and* user power interaction.
Availability
LTC1475CMS8-3.3#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless modems, handheld test instruments, and intrinsic safety barriers requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1475CMS8-3.3#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1475CMS8-3.3#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for ultra-low-power, battery-operated portable electronics requiring high efficiency across wide load ranges and intelligent power control features.
FAQ
What is the maximum continuous output current of the LTC1475CMS8-3.3#TRPBF?
The LTC1475CMS8-3.3#TRPBF delivers up to 250mA continuously at 3.3V output under typical conditions (VIN = 5V, TA = 25°C, with appropriate inductor and layout). Its peak switch current is programmable from 325mA (RSENSE = 0Ω) to 400mA, providing design margin for transient loads. Derating is required at higher ambient temperatures or VIN due to thermal limits of the 8-lead MSOP package.
Does the LTC1475CMS8-3.3#TRPBF require an external current-sense resistor?
No, the LTC1475CMS8-3.3#TRPBF does not require an external current-sense resistor. When Pins 6 (SENSE) and 7 (VIN) are shorted, the device defaults to a minimum peak switch current of 325mA using its internal 0.25Ω sense element. An external resistor is optional and used only to lower the current limit-for example, 1.1Ω yields ~75mA trip threshold-enabling optimization for lower-current applications.
How does the pushbutton on/off functionality work on the LTC1475CMS8-3.3#TRPBF?
The LTC1475CMS8-3.3#TRPBF implements pushbutton control via two dedicated pins: momentary grounding of Pin 8 (ON) wakes the device from shutdown into run mode, while momentary grounding of Pin 3 (LBI/OFF) places it back into shutdown. This latching behavior uses an internal S/R flip-flop, eliminating the need for external logic or microcontroller intervention-ideal for battery-powered handheld devices with physical power buttons.
Can the LTC1475CMS8-3.3#TRPBF operate with input voltage below 4V?
No, the LTC1475CMS8-3.3#TRPBF has a specified minimum input voltage of 4V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4V may result in loss of regulation, reduced efficiency, or failure to start. For sub-4V operation (e.g., single-cell LiFePO₄ or NiMH), consider the LTC1474/LTC1475 adjustable versions with external feedback resistors or alternative regulators like the LTC3642.
Is the low-battery detector active when the LTC1475CMS8-3.3#TRPBF is in shutdown mode?
Yes, the low-battery detector remains fully active during shutdown mode of the LTC1475CMS8-3.3#TRPBF. The internal 1.23V reference and comparator continue operating, allowing Pin 2 (LBO) to sink current when Pin 3 (LBI/OFF) falls below the 1.23V threshold-even with RUN/ON inactive. This enables system-level battery monitoring without waking the main regulator, preserving ultra-low 6µA shutdown current.
LTC1475CMS8-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
LTC1475CMS8-3.3#TRPBF FAQ
1.How can I place an order for LTC1475CMS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1475CMS8-3.3#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 LTC1475CMS8-3.3#TRPBF reliable?
The price and inventory of LTC1475CMS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1475CMS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1475CMS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1475CMS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1475CMS8-3.3#TRPBF?
LTC1475CMS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1475CMS8-3.3#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 LTC1475CMS8-3.3#TRPBF?
For technical support, including LTC1475CMS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1475CMS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1475CMS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1475CMS8-3.3#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 LTC1475CMS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1475CMS8-3.3#TRPBF?
All LTC1475CMS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1475CMS8-3.3#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 LTC1475CMS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1475CMS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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