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Analog Devices Inc. LTC1475CMS8-3.3#PBF
- Part No.:
- LTC1475CMS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1475CMS8-3.3#PBF.pdf
- Description:
- IC REG BUCK BST 3.3V 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,439
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Product details
Overview
LTC1475CMS8-3.3#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with integrated P-channel MOSFET, delivering 3.3V at up to 250mA output current. It operates from 3V to 18V input, achieves >92% peak efficiency, and features pushbutton on/off control, programmable current limit, and active-low micropower shutdown (6µA typ). It is used in battery-powered portable instruments and wireless modems requiring stable low-noise 3.3V rails.
For engineers reviewing the LTC1475CMS8-3.3#PBF datasheet, LTC1475CMS8-3.3#PBF pinout, LTC1475CMS8-3.3#PBF application, or LTC1475CMS8-3.3#PBF equivalent, key selection considerations include its 3.3V fixed output, 8-pin MSOP package, 10µA no-load supply current, 4.75µs off-time, and LBI/OFF dual-function pin for low-battery detection and shutdown initiation.
Technical Context
The LTC1475CMS8-3.3#PBF uses Burst Mode™ operation to maintain regulation while minimizing quiescent current: it alternates short energy bursts (with 4.75µs controlled off-time) and deep-sleep cycles where only the voltage comparator, 1.23V reference, and low-battery comparator remain active. Its internal current sensing-via a 5Ω internal sense resistor and optional external RSENSE-trips at 100mV to limit peak switch current between 325mA (RSENSE = 0Ω) and 76mA (RSENSE = 1.1Ω).
Unlike the LTC1474, the LTC1475CMS8-3.3#PBF implements pushbutton control via an internal S/R flip-flop: a momentary ground on Pin 8 (ON) initiates run mode, while a momentary ground on Pin 3 (LBI/OFF) triggers shutdown. The LBI/OFF pin retains low-battery comparator functionality during shutdown, with trip threshold of 1.23V ±7mV and hysteresis of 5mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.300V ±2% (3.234V–3.366V) at 50mA load; enables direct replacement of 3.3V LDOs without feedback divider. |
| Input Voltage Range | 3V to 18V continuous operation; supports single-cell Li-ion (4.2V), dual-cell alkaline (3V–3.2V), and industrial 12V rails. |
| No-Load Supply Current | 10µA typical; ensures >1-year battery life in always-on sensor nodes powered by 2×AA cells (3000mAh). |
| Shutdown Current | 6µA typical; allows ultra-low-power sleep states in handheld devices with mechanical power buttons. |
| Peak Switch Current Limit | 325–400mA (RSENSE = 0Ω); sets maximum inductor current to optimize size/efficiency trade-off for ≤250mA loads. |
| Switch On-Resistance | 1.4Ω typical at VIN = 10V; limits conduction loss to <35mW at 250mA, enabling thermally robust operation in MSOP-8. |
| Off-Time Duration | 4.75µs nominal (up to 65µs under short-circuit); ensures complete inductor current decay even at near-zero VOUT. |
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 resistive divider; no external components needed for fixed-output operation. |
| LBO (Pin 2) | Low-battery comparator open-drain output | Sinks up to 0.7mA when LBI/OFF voltage drops below 1.23V; drives LED or microcontroller interrupt directly. |
| LBI/OFF (Pin 3) | Dual-function input: low-battery detect + shutdown trigger | Comparator input referenced to 1.23V; momentary ground initiates shutdown-no pull-up required for button interface. |
| GND (Pin 4) | Power and signal ground reference | Single ground plane connection point; must be tied to PCB ground plane with low-inductance path. |
| SW (Pin 5) | Drain of internal P-channel MOSFET power switch | Connects directly to cathode of external Schottky catch diode (e.g., MBR0530); requires tight layout to minimize ringing. |
| SENSE (Pin 6) | Current sense input / source of internal PMOS | Accepts optional external RSENSE between Pins 6 and 7 to program peak current; default 325mA limit if shorted. |
| VIN (Pin 7) | Main input supply (3V–18V) | Supplies internal bias circuitry and gate drive; requires local 0.1µF ceramic + bulk capacitor (e.g., 10µF/25V). |
| ON (Pin 8) | Pushbutton run-mode initiator | Internal pull-up; momentary ground sets S/R latch to enable switching-enables single-button power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at light loads with 10µA no-load current-critical for multi-year battery life in IoT sensors. |
| Pushbutton on/off control | Eliminates need for external logic or microcontroller GPIO for power sequencing in handheld devices. |
| 100% duty-cycle capability | Supports dropout operation down to VIN = VOUT, enabling use in aging battery applications (e.g., 3.4V → 3.3V). |
| Integrated low-battery detector | Remains fully functional during shutdown, allowing system-level battery monitoring without auxiliary circuitry. |
| Programmable current limit | Adjusts peak switch current from 70mA to 400mA via external RSENSE, optimizing inductor size and EMI. |
Applications
| Portable Medical Sensors | Wireless Modem Power Rail |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell (3V, 225mAh) with BLE transmission every 5 minutes. IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator supplying RF transceiver, MCU, and analog front-end. Use Value: 10µA no-load current extends battery life beyond 2 years; 100% duty cycle maintains regulation as cell voltage drops to 2.8V. |
Use Scenario: LTE-M module in asset tracker requiring clean 3.3V rail for baseband processor and PA driver. IC Role / Device Role / Timing Role: Main DC/DC converter delivering 250mA peak current during data burst transmission. Use Value: >92% efficiency at 200mA reduces thermal load in sealed enclosure; low EMI Burst Mode minimizes RF interference. |
| Handheld Barcode Scanner | Industrial Field Transmitter |
Use Scenario: Battery-operated scanner using pushbutton to wake from deep sleep and activate laser/decoder. IC Role / Device Role / Timing Role: System power controller with ON/LBI/OFF pins enabling mechanical power toggle and low-battery alert. Use Value: Single-button interface eliminates firmware dependency; LBO pin drives red LED indicator without added transistor. |
Use Scenario: 4–20mA loop-powered transmitter with isolated microcontroller requiring local 3.3V supply. IC Role / Device Role / Timing Role: Auxiliary regulator deriving 3.3V from loop voltage (12–42V) via pre-regulator stage. Use Value: Wide 3V–18V input range accommodates variable loop drop; 6µA shutdown current preserves loop compliance margin. |
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; 400mA IOUT; 2.5µA shutdown current. | Higher switching frequency enables smaller inductors/caps but increases light-load inefficiency; no LBI/OFF dual-function pin. | Prefer for space-constrained designs needing higher frequency; avoid where ultra-low IQ or pushbutton control is mandatory. |
| MAX17222ETA+ | Hysteretic 500kHz operation; 1.8V–5.5V input; 3.3V output; 300mA IOUT; 1.6µA quiescent current; no integrated LBO/LBI. | Lower IQ than LTC1475 but lacks low-battery monitoring and pushbutton interface; requires external enable logic. | Select when lowest possible standby current is critical and system already provides battery monitoring; not drop-in for LBI/OFF functions. |
Compared with TPS62231DRYR and MAX17222ETA+, the LTC1475CMS8-3.3#PBF uniquely combines pushbutton on/off, active low-battery detection during shutdown, and sub-10µA no-load operation in a single 8-pin MSOP-making it irreplaceable in mechanically activated, battery-gauged portable systems.
Availability
LTC1475CMS8-3.3#PBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless modems, handheld scanners, and industrial field transmitters requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1475CMS8-3.3#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application expertise for legacy Linear regulators like the LTC1475 series.
The LTC1475CMS8-3.3#PBF belongs to Linear's low-quiescent-current DC/DC converter family, designed specifically for battery-powered instrumentation and handheld devices demanding multi-year runtime and mechanical power control.
FAQ
What is the minimum input voltage required for the LTC1475CMS8-3.3#PBF to regulate 3.3V output?
The LTC1475CMS8-3.3#PBF supports 100% duty-cycle operation, enabling regulation down to VIN = VOUT = 3.3V. However, reliable startup requires VIN ≥ 3.0V per Absolute Maximum Ratings, and practical operation begins at ~3.1V to ensure sufficient headroom for internal bias generation. Below 3.1V, the device may enter undervoltage lockout or fail to initiate switching.
Can the LTC1475CMS8-3.3#PBF be used without an external current sense resistor?
Yes-the LTC1475CMS8-3.3#PBF defaults to a 325–400mA peak switch current limit when Pins 6 (SENSE) and 7 (VIN) are shorted, using only its internal 5Ω sense resistor. This configuration eliminates RSENSE and its decoupling capacitor, simplifying layout for 250mA applications where precise current limiting is not required.
How does the LBI/OFF pin function during shutdown mode in the LTC1475CMS8-3.3#PBF?
During shutdown, the LBI/OFF pin remains fully active as the input to the low-battery comparator. It continuously compares the external voltage divider output against the internal 1.23V reference. If the divided voltage falls below the trip threshold (1.23V ±7mV), the LBO pin sinks current-enabling battery monitoring even when the main regulator is disabled.
What is the purpose of the 100kΩ resistor required between the ON pin and a pushbutton in the LTC1475CMS8-3.3#PBF?
The 100kΩ series resistor on the ON pin (Pin 8) limits inrush current during button press and prevents false triggering from noise or contact bounce. It works with the internal pull-up to ensure clean S/R latch toggling: grounding through the resistor pulls Pin 8 below 0.7V threshold reliably, while the resistor value avoids excessive voltage drop during sustained ground conditions.
Does the LTC1475CMS8-3.3#PBF require an external feedback resistor network for 3.3V output?
No-the LTC1475CMS8-3.3#PBF has an internal precision resistive divider optimized for 3.3V output. Pin 1 (VOUT/VFB) connects directly to the regulated output; no external resistors or capacitors are needed for basic operation. External components are only required for adjustable versions or stability enhancement in noisy environments.
LTC1475CMS8-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 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#PBF FAQ
1.How can I place an order for LTC1475CMS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1475CMS8-3.3#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 LTC1475CMS8-3.3#PBF reliable?
The price and inventory of LTC1475CMS8-3.3#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1475CMS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1475CMS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1475CMS8-3.3#PBF?
LTC1475CMS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1475CMS8-3.3#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 LTC1475CMS8-3.3#PBF?
For technical support, including LTC1475CMS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1475CMS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1475CMS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1475CMS8-3.3#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 LTC1475CMS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1475CMS8-3.3#PBF?
All LTC1475CMS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1475CMS8-3.3#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 LTC1475CMS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1475CMS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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