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Analog Devices Inc. LTC1474CMS8#TRPBF
- Part No.:
- LTC1474CMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1474CMS8#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,037
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Product details
Overview
LTC1474CMS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with an internal 1.4Ω P-channel MOSFET switch, fixed 3.3V output, and 8-lead MSOP package. It operates from 3V to 18V input, delivers up to 250mA, achieves >92% efficiency at 200mA, and draws only 10µA no-load supply current. It is used in battery-powered portable instruments and wireless modems requiring stable low-power regulation.
For engineers reviewing the LTC1474CMS8#TRPBF datasheet, LTC1474CMS8#TRPBF pinout, LTC1474CMS8#TRPBF application, or LTC1474CMS8#TRPBF equivalent, key selection criteria include its 3.3V fixed output, 10µA quiescent current, 1.4Ω internal switch RDS(ON), Burst Mode™ operation for light-load efficiency, and integrated low-battery detector functional during shutdown.
Technical Context
The LTC1474CMS8#TRPBF uses Burst Mode™ control to maintain regulation while minimizing no-load current: it alternates short energy bursts (with 4.75µs off-time) and sleep cycles where only reference, voltage comparator, and low-battery circuitry remain active. Its peak current is programmable via external sense resistor or defaults to 325–400mA with internal sensing.
It integrates a 1.23V reference, voltage feedback comparator with 5mV hysteresis, low-battery comparator (trip threshold 1.16–1.27V), open-drain LBO output, and logic-controlled RUN pin (0.4–1.0V threshold). The internal PMOS switch features 1.4Ω typical RDS(ON) at VIN = 10V and supports 100% duty cycle for ultra-low dropout operation.
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 resistive divider |
| Input Voltage Range | 3V to 18V - supports single-cell Li-ion, multi-cell alkaline, 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 |
| Switch RDS(ON) | 1.4Ω typical at VIN = 10V - limits conduction loss at moderate load currents |
| Peak Switch Current | 325–400mA (RSENSE = 0Ω) - sets maximum inductor current and provides short-circuit protection |
| Feedback Voltage | 1.230V ±2.4% - precision reference enabling tight output tolerance without external resistors |
| Efficiency | >92% at IOUT = 200mA, VIN = 5V - achieved via Burst Mode™ and low RDS(ON) |
Pinout & Package
Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), RoHS-compliant, thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | Internally connected to 3.3V divider; monitors output and compares to 1.23V reference for regulation |
| LBO (Pin 2) | Low-battery open-drain output | Sinks current when LBI < 1.23V; remains active in shutdown for battery monitoring |
| LBI (Pin 3) | Low-battery input | Compares external battery-sense voltage to 1.23V reference; trip threshold 1.16–1.27V |
| GND (Pin 4) | Power and signal ground | Common return for switch, feedback, and comparator circuits; requires low-impedance PCB connection |
| SW (Pin 5) | Switch node | Drain of internal PMOS; connects directly to cathode of external Schottky catch diode |
| SENSE (Pin 6) | Current sense input | Monitors switch current via internal 5Ω + optional external resistor; trips at 100mV total drop |
| VIN (Pin 7) | Main input supply | Accepts 3V–18V; powers internal circuitry and charges switch gate; requires local 0.1µF ceramic decoupling |
| RUN (Pin 8) | Enable/shutdown control | Logic-level input: grounded = shutdown (6µA IQ), open/high = active; 0.4–1.0V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at light loads with 9µA sleep-mode current, enabling >85% efficiency down to 1mA |
| 100% duty-cycle capability | Supports dropout as low as VOUT – VIN ≈ 0V, critical for end-of-battery-life operation in 3.3V systems |
| Integrated low-battery detector | Active during shutdown; allows system-level battery monitoring without external comparators or power |
| Programmable peak current limit | Adjustable from 10mA to 400mA via external RSENSE, optimizing inductor size and ripple for specific load |
| Internal 1.4Ω PMOS switch | Eliminates external high-side switch; reduces BOM count and layout area vs. controller-only solutions |
| Short-circuit protection | Auto-recovering current limiting via SENSE pin; prevents damage during output faults or startup into heavy capacitive loads |
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 regulator delivering 150mA peak to RF transceiver and analog front-end. Use Value: 10µA no-load current extends battery life; Burst Mode™ sustains >80% efficiency at 100µA sensor bias current. | Use Scenario: LTE-M module in asset tracker operating from 2xAA alkaline cells (2.4–3.2V range). IC Role / Device Role / Timing Role: Step-down regulator maintaining stable 3.3V for modem IC and GPS receiver during burst transmissions. Use Value: 100% duty cycle allows regulation down to 3.2V input; low dropout preserves usable battery capacity until depletion. |
| Handheld Test Equipment | Intrinsic Safety Barriers |
Use Scenario: Battery-operated multimeter with LCD backlight and microcontroller, requiring clean 3.3V rail. IC Role / Device Role / Timing Role: Main power supply converting 9V PP3 battery to regulated 3.3V for digital logic and analog circuitry. Use Value: Integrated low-battery detector (LBI/LBO) triggers UI warning before brownout; eliminates discrete supervisor IC. | Use Scenario: Loop-powered field transmitter in hazardous areas, limited to ≤4mA quiescent draw per safety standard. IC Role / Device Role / Timing Role: Auxiliary 3.3V supply derived from 4–20mA loop, powering isolated ADC and digital interface. Use Value: 10µA shutdown current ensures compliance with intrinsic safety energy limits; SENSE pin enables precise current limiting. |
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 | 3.3V fixed, 17µA IQ, 300mA output, 2.05V–6.5V input, 2.5MHz switching | Higher frequency enables smaller inductors/caps but higher EMI; narrower input range excludes 9V/12V battery use | Select for space-constrained designs needing >1MHz operation; avoid if input exceeds 6.5V or ultra-low IQ is mandatory |
| MAX17222ETA+ | 3.3V fixed, 600nA IQ, 400mA output, 0.7V–5.5V input, 1.6MHz switching | Near-zero IQ ideal for energy harvesting; input range too low for multi-cell batteries or 12V systems | Select for sub-1V energy-harvesting sources; not suitable for standard alkaline/Li-ion inputs above 5.5V |
Compared with TPS62231DRYR and MAX17222ETA+, the LTC1474CMS8#TRPBF offers wider input range (3–18V) and superior 10µA IQ for mid-voltage battery systems, while trading off switching frequency for lower EMI and simpler EMI filtering.
Availability
LTC1474CMS8#TRPBF 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 long-lifecycle industrial programs.
Supply support for LTC1474CMS8#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 acquired Linear Technology in 2017 and continues its legacy of high-performance analog and power management ICs.
The LTC1474CMS8#TRPBF belongs to the LTC® step-down converter family designed specifically for ultra-low-power, battery-operated applications demanding high efficiency across wide load ranges and extended operating voltage windows.
FAQ
What is the maximum continuous output current of the LTC1474CMS8#TRPBF?
The LTC1474CMS8#TRPBF delivers up to 250mA continuously under typical conditions (VIN = 5V, VOUT = 3.3V, TA = 25°C) with proper thermal design. Peak switch current is programmable from 10mA to 400mA via the SENSE pin; the default 325–400mA limit ensures robust short-circuit protection while supporting full 250mA load capability in standard layouts using recommended 100µH inductors and MBR0530 diodes.
Does the LTC1474CMS8#TRPBF support adjustable output voltages?
No, the LTC1474CMS8#TRPBF is a fixed 3.3V output variant. Adjustable versions (e.g., LTC1474CMS8) require external feedback resistors between VOUT and VFB pins and are orderable separately. The LTC1474CMS8#TRPBF integrates the resistor divider internally, so VOUT/VFB (Pin 1) connects directly to the output and must not be externally loaded or divided.
How does the low-battery detector function in shutdown mode for the LTC1474CMS8#TRPBF?
The low-battery detector in the LTC1474CMS8#TRPBF remains fully operational during shutdown: the internal 1.23V reference and comparator continue drawing current, allowing LBI (Pin 3) to be monitored and LBO (Pin 2) to sink current when battery voltage falls below 1.16–1.27V. This enables host systems to detect end-of-life battery conditions without waking the regulator, preserving the 6µA shutdown current budget.
What is the purpose of the SENSE pin on the LTC1474CMS8#TRPBF?
The SENSE pin (Pin 6) on the LTC1474CMS8#TRPBF provides programmable overcurrent protection by monitoring voltage drop across an optional external resistor (or internal 5Ω path). When the total drop reaches 100mV, the current comparator trips, terminating the switch on-time. With pins 6 and 7 shorted, the device defaults to 325–400mA peak current, enabling simple, resistor-free designs while retaining short-circuit protection.
Can the LTC1474CMS8#TRPBF operate with a 2.5V input supply?
No, the LTC1474CMS8#TRPBF has a minimum input voltage of 3V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3V is not guaranteed and may result in loss of regulation, increased dropout, or failure to start. For sub-3V applications, consider alternatives like the MAX17222 (0.7V–5.5V input) or evaluate whether the system can tolerate reduced functionality at low battery voltage.
LTC1474CMS8#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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1474CMS8#TRPBF FAQ
1.How can I place an order for LTC1474CMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474CMS8#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#TRPBF reliable?
The price and inventory of LTC1474CMS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1474CMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474CMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474CMS8#TRPBF?
LTC1474CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474CMS8#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#TRPBF?
For technical support, including LTC1474CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474CMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1474CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1474CMS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1474CMS8#TRPBF?
All LTC1474CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474CMS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1474CMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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