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Analog Devices Inc. LTC1474CMS8-3.3#TRPBF
- Part No.:
- LTC1474CMS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1474CMS8-3.3#TRPBF.pdf
- Description:
- IC REG BUCK BST 3.3V 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,046
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Product details
Overview
LTC1474CMS8-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with integrated 1.4Ω P-channel MOSFET switch, fixed 3.3V output, and 8-lead MSOP package. It delivers up to 250mA output current, achieves >92% peak efficiency at 5V input, draws only 10µA no-load supply current, and supports 4V–18V input range - ideal for battery-powered portable instrumentation and wireless modems.
For engineers reviewing the LTC1474CMS8-3.3#TRPBF datasheet, LTC1474CMS8-3.3#TRPBF pinout, LTC1474CMS8-3.3#TRPBF application, or LTC1474CMS8-3.3#TRPBF equivalent, key selection criteria include its 3.3V fixed output accuracy (±2%), 10µA quiescent current, 100% duty-cycle low-dropout capability, programmable current limit (325–400mA), and active-low shutdown with 6µA IQ.
Technical Context
The LTC1474CMS8-3.3#TRPBF uses Burst Mode™ operation to maintain regulation while minimizing idle current: it alternates short switching bursts (with 4.75µs off-time) and deep-sleep cycles where only the 1.23V reference, voltage comparator, and low-battery detector remain active. Its internal current comparator monitors switch current via an integrated 5Ω sense resistor (plus optional external RSENSE) and trips at 100mV threshold.
Unlike the LTC1475 variant, the LTC1474CMS8-3.3#TRPBF implements logic-controlled shutdown via the RUN pin (0.4–1.0V threshold), not pushbutton on/off. The low-battery detector (LBI/LBO) remains fully functional during shutdown, with 1.16–1.27V trip threshold and open-drain LBO output capable of sinking 0.45–0.70mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.300V ±2% (3.234–3.366V); internally trimmed resistive divider referenced to 1.23V bandgap |
| Input Voltage Range | 4V 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 LBI comparator functionality |
| Peak Switch Current | 325–400mA (RSENSE = 0Ω); sets maximum inductor current for short-circuit protection and light-load optimization |
| Switch On-Resistance | 1.4Ω typical at VIN = 10V; determines conduction loss and thermal rise under full load |
| Feedback Voltage | 1.230V ±2.0%; stable bandgap reference used for output regulation and low-battery detection |
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 feedback node | Internally connected to 3.3V output divider; provides regulated 1.23V reference point for error amplifier |
| LBO (Pin 2) | Low-battery open-drain output | Sinks up to 0.7mA when LBI < 1.23V; drives LED or microcontroller interrupt without pull-up |
| LBI (Pin 3) | Low-battery input comparator | Monitors external voltage divider; remains active in shutdown to enable battery monitoring during standby |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, feedback, and comparator circuits; must be low-impedance connection |
| SW (Pin 5) | Drain of internal P-MOSFET switch | Connects directly to cathode of external Schottky diode; carries pulsed inductor current up to 400mA |
| SENSE (Pin 6) | Current sense input | Inputs voltage across internal + optional external sense resistor; triggers current limit at 100mV |
| VIN (Pin 7) | Main input supply | Accepts 4–18V; powers internal circuitry and supplies gate drive for P-MOSFET switch |
| RUN (Pin 8) | Active-low shutdown control | Pulled low (≤0.4V) to disable regulator; open/high (>0.7V) enables operation; 0.4–1.0V hysteresis prevents chatter |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at light loads with 10µA IQ by alternating microsecond-scale bursts and µA-level sleep cycles |
| 100% duty-cycle capability | Enables dropout as low as VIN – VOUT ≈ 0V; sustains output even when input sags near 3.3V |
| Integrated low-battery detector | Operates independently in shutdown; provides early warning before system brownout using same 1.23V reference |
| Programmable current limit | Adjustable from 325mA to <10mA via external RSENSE; optimizes inductor size and ripple for specific load |
| Logic-compatible shutdown | RUN pin accepts standard CMOS/TTL levels; eliminates need for external level-shifting or pull-up networks |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator delivering 200mA with <10µA quiescent draw during standby. Use Value: Extends talk time by minimizing no-load loss; 100% duty cycle prevents reset during battery sag below 3.5V. | Use Scenario: Supplying microcontroller, ADC, and LCD backlight in handheld multimeter. IC Role / Device Role / Timing Role: Main 3.3V rail generator with integrated low-battery alert for user notification. Use Value: Eliminates discrete comparator; LBO pin directly drives status LED without additional components. |
| Battery-Operated Digital Devices | 4–20mA Current Loop Step-Down |
Use Scenario: Powering BLE SoC and sensors in asset tracker with coin-cell or AA batteries. IC Role / Device Role / Timing Role: Ultra-low-IQ DC/DC converter enabling >5-year shelf life in sleep mode. Use Value: 6µA shutdown current preserves battery during transport; RUN pin allows host MCU to manage power state. | Use Scenario: Generating isolated 3.3V rail for loop-powered field transmitter electronics. IC Role / Device Role / Timing Role: Local 3.3V supply derived from 4–20mA loop voltage (typically 12–36V). Use Value: Wide 4–18V input range accommodates varying loop compliance voltage; low dropout ensures operation at 12V minimum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3675EFE-3.3#PBF | Higher 600mA output, 2.5V–5.5V input, 22µA IQ, 16-pin TSSOP; includes I²C interface and multiple rails | Targeted at multi-rail PMIC systems, not single-output simplicity | Choose when needing programmable sequencing or dual outputs; avoid if minimizing BOM count is critical |
| TPS62231DRYR | 3.3V fixed, 2.05–6.5V input, 17µA IQ, 2.2MHz switching, 6-pin WSON; no LBI/LBO or programmable current limit | Lacks battery monitoring and adjustable current limiting; optimized for compact footprint over feature set | Prefer for space-constrained designs where low-noise 2.2MHz operation matters more than shutdown intelligence |
Compared with LTC3675EFE-3.3#PBF and TPS62231DRYR, the LTC1474CMS8-3.3#TRPBF uniquely balances ultra-low quiescent current (10µA), integrated battery monitoring (LBI/LBO), and simple logic-controlled shutdown - making it optimal for cost-sensitive, long-life, single-rail battery systems where feature integration reduces component count.
Availability
LTC1474CMS8-3.3#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, and battery-operated digital devices requiring stable component supply across commercial temperature range (0°C to 70°C).
Supply support for LTC1474CMS8-3.3#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1474 series was designed specifically for ultra-low-power, moderate-current (≤300mA) battery-powered applications demanding high efficiency across wide load ranges and intelligent power management features like low-battery detection.
FAQ
What is the guaranteed output voltage tolerance for LTC1474CMS8-3.3#TRPBF?
The LTC1474CMS8-3.3#TRPBF guarantees a 3.3V output within ±2% (3.234V to 3.366V) at 50mA load and TA = 25°C, with full-temperature-range specification over 0°C to 70°C. This accuracy is achieved via laser-trimmed internal feedback resistors referenced to a precision 1.23V bandgap.
Does LTC1474CMS8-3.3#TRPBF support 100% duty cycle operation, and what is its practical dropout voltage?
Yes, the LTC1474CMS8-3.3#TRPBF supports true 100% duty cycle operation, allowing it to sustain regulation down to VIN ≈ VOUT. At 250mA load, measured dropout is typically <200mV (e.g., 3.5V input yields stable 3.3V output), enabling reliable operation as battery voltage declines near end-of-life.
How does the current limit function on LTC1474CMS8-3.3#TRPBF, and can it be adjusted?
The LTC1474CMS8-3.3#TRPBF uses an internal current comparator that trips at 100mV across its integrated 5Ω sense element plus any external RSENSE between SENSE and VIN pins. With RSENSE = 0Ω (pins 6–7 shorted), peak current is 325–400mA; adding RSENSE lowers the trip point linearly - e.g., 1.1Ω yields ~70–85mA - enabling precise optimization for low-noise or low-power designs.
Is the low-battery detector in LTC1474CMS8-3.3#TRPBF operational during shutdown mode?
Yes, the low-battery detector (LBI/LBO) remains fully active during shutdown mode of the LTC1474CMS8-3.3#TRPBF. The 1.23V reference and comparator continue drawing only ~1µA, allowing continuous battery voltage monitoring and LBO assertion (sink current) even when the main regulator is disabled via the RUN pin.
What is the maximum recommended operating junction temperature for LTC1474CMS8-3.3#TRPBF, and how is thermal performance characterized?
The absolute maximum junction temperature for LTC1474CMS8-3.3#TRPBF is 125°C. Its MS8 package has θJA = 150°C/W (JEDEC-standard PCB layout). At 250mA output and 12V input, typical power dissipation is ~350mW, resulting in ~52°C junction rise above ambient - well within safe margin for commercial-grade operation.
LTC1474CMS8-3.3#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
LTC1474CMS8-3.3#TRPBF FAQ
1.How can I place an order for LTC1474CMS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474CMS8-3.3#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 LTC1474CMS8-3.3#TRPBF reliable?
The price and inventory of LTC1474CMS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1474CMS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1474CMS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474CMS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474CMS8-3.3#TRPBF?
LTC1474CMS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474CMS8-3.3#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 LTC1474CMS8-3.3#TRPBF?
For technical support, including LTC1474CMS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474CMS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1474CMS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1474CMS8-3.3#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 LTC1474CMS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1474CMS8-3.3#TRPBF?
All LTC1474CMS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474CMS8-3.3#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 LTC1474CMS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1474CMS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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