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Analog Devices Inc. LTC1474CMS8#PBF
- Part No.:
- LTC1474CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1474CMS8#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:499
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Product details
Overview
LTC1474CMS8#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with an integrated 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 output current, achieves >92% peak efficiency at 25mA load, and draws only 10µA typical no-load supply current. It is designed for battery-powered portable instruments requiring stable low-noise 3.3V rail generation.
For engineers reviewing the LTC1474CMS8#PBF datasheet, LTC1474CMS8#PBF pinout, LTC1474CMS8#PBF application, or LTC1474CMS8#PBF equivalent, key selection considerations include its 10µA quiescent current, programmable current limit (325–400mA), 1.23V internal reference, 4.75µs off-time, and low-battery detector functional in shutdown - all critical for ultra-low-power embedded power management.
Technical Context
The LTC1474CMS8#PBF uses Burst Mode™ operation to maintain regulation while minimizing idle current: it alternates short energy bursts (with 4.75µs controlled off-time) and deep-sleep cycles where only the 1.23V reference, voltage comparator, and low-battery detector remain active. Its current-mode control employs an internal 5Ω sense resistor plus optional external RSENSE to set peak switch current at 325mA (RSENSE = 0Ω) or down to 70mA (RSENSE = 1.1Ω), enabling optimization for low-noise or high-efficiency operation.
It integrates a 1.23V bandgap reference, open-drain LBO output, and logic-controlled RUN pin (active-high) for shutdown - distinct from the pushbutton-enabled LTC1475. The device supports 100% duty cycle for ultra-low dropout and maintains regulation across –40°C to 85°C industrial temperature range with θJA = 150°C/W in MS8 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.300V ±2% (3.234V–3.366V); tightly regulated via internal 1.23V reference and resistive divider |
| Input Voltage Range | 3V to 18V; enables direct use with 4-cell alkaline, Li-ion, or wide-range industrial supplies |
| No-Load Supply Current | 10µA typical; enables multi-year battery life in always-on sensor nodes |
| Peak Switch Current Limit | 325mA minimum (RSENSE = 0Ω); programmable up to 400mA; provides inherent short-circuit protection |
| Switch On-Resistance | 1.4Ω typical at VIN = 10V; minimizes conduction loss in medium-current step-down applications |
| Efficiency (IOUT = 25mA) | ≥92% at VIN = 5V; sustained high efficiency across 1mA–250mA load range due to Burst Mode™ |
| Shutdown Current | 6µA typical; preserves battery during system sleep with LBO still active |
| Low-Battery Threshold | 1.23V ±0.05V on LBI pin; comparator remains operational in shutdown for battery monitoring |
Pinout & Package
Package: 8-lead MSOP (MS8), 3mm × 3mm × 0.85mm body, exposed pad (not electrically connected), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage feedback node | Internally connected to 3.3V output divider; serves as regulation sense point - tie directly to output capacitor for stability |
| LBO (Pin 2) | Low-battery open-drain output | Sinks current when LBI < 1.23V; requires external pull-up for microcontroller interrupt or LED indication |
| LBI (Pin 3) | Low-battery input comparator | Monitors divided battery voltage against 1.23V reference; functional in shutdown for battery health monitoring |
| GND (Pin 4) | Power and signal ground reference | Primary return path for switch current, feedback, and bias circuits; must be low-impedance connection to power plane |
| SW (Pin 5) | Switch node | Drain of internal P-MOSFET; connects directly to cathode of external Schottky catch diode and inductor |
| SENSE (Pin 6) | Current sense input | Inputs voltage across internal + optional external RSENSE; trips at 100mV to limit peak switch current |
| VIN (Pin 7) | Main input supply | Accepts 3V–18V; requires local 0.1µF ceramic + bulk capacitor; feeds internal bias and switch driver |
| RUN (Pin 8) | Logic-controlled enable input | Active-high: open or ≥1.0V = run mode; ≤0.4V = shutdown; 0.4–0.7V = indeterminate; source current <1.2µA |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at light loads with 10µA typical IQ, eliminating linear regulator inefficiency in battery systems |
| Programmable current limit | Set from 70mA to 400mA using single external resistor - enables optimization for inductor size, ripple, and noise |
| 100% duty-cycle capability | Supports VOUT regulation even when VIN drops to VOUT + ~0.3V - critical for end-of-battery-life operation |
| Low-battery detector in shutdown | Active monitoring of battery voltage during system sleep without waking main regulator - extends usable battery capacity |
| Integrated 1.4Ω P-MOSFET | Eliminates need for external high-side switch and gate driver - reduces BOM count and layout complexity |
| 8-lead MSOP package | 3mm × 3mm footprint with thermal performance (θJA = 150°C/W) suitable for space-constrained portable designs |
Applications
| Portable Medical Sensors | Wireless Modem Power Rails |
|---|---|
Use Scenario: Continuous glucose monitor powered by two AA alkaline cells with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 3.3V supply for ultra-low-power MCU, BLE radio, and analog front-end; regulates down from 3–3.2V nominal battery voltage. Use Value: 10µA quiescent current and 100% duty cycle extend usable battery life beyond 3 years in active mode and preserve charge during long standby intervals. |
Use Scenario: LTE-M module in smart utility meter requiring stable 3.3V rail during burst transmissions and deep sleep. IC Role / Device Role / Timing Role: Step-down converter supplying RF transceiver and baseband processor; synchronized to modem's activity scheduler. Use Value: Burst Mode™ ensures <92% efficiency at 10mA transmit current and <15µA sleep current - meeting ETSI Class 2 power budget constraints. |
| Handheld Test Equipment | Intrinsic Safety Barriers |
Use Scenario: Battery-operated multimeter with isolated analog inputs and LCD display operating from 4×AA cells. IC Role / Device Role / Timing Role: Main 3.3V digital supply feeding MCU, ADC, and display controller; co-located with precision voltage reference. Use Value: Low 50mVP-P output ripple and <20mV load regulation prevent measurement noise and digitization errors in 16-bit ADC subsystems. |
Use Scenario: Loop-powered field transmitter in hazardous area requiring certified low-energy 3.3V auxiliary rail. IC Role / Device Role / Timing Role: Intrinsically safe secondary regulator deriving 3.3V from 4–20mA loop; current-limited to <80mA per IEC 60079-11. Use Value: Programmable 70–400mA current limit allows precise compliance with entity parameter limits - validated for Class I, Division 1 installations. |
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 IOUT | Higher switching frequency enables smaller inductors but increases light-load inefficiency vs. LTC1474CMS8#PBF | Prefer TPS62231DRYR for compact layouts needing <1µH inductors; prefer LTC1474CMS8#PBF for battery runtime-critical designs |
| MAX17222ETA+ | Hysteretic 2.5V–5.5V input; 1.4µA IQ; 300mA IOUT; no current limit programming | Ultra-low IQ suits coin-cell applications, but lacks low-battery detection and programmable current limit | Choose MAX17222ETA+ for sub-10µA systems without battery monitoring; retain LTC1474CMS8#PBF when LBI/LBO functionality is required |
Compared with TPS62231DRYR and MAX17222ETA+, the LTC1474CMS8#PBF uniquely combines ultra-low 10µA quiescent current, integrated low-battery comparator with shutdown operation, and user-programmable current limit - making it optimal for industrial portable devices needing both long battery life and intelligent power supervision.
Availability
LTC1474CMS8#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 with guaranteed long-term manufacturability.
Supply support for LTC1474CMS8#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors with over 50 years of innovation in precision power conversion.
The LTC1474CMS8#PBF belongs to Linear's legacy high-efficiency, low-IQ DC/DC converter family, engineered specifically for battery-powered instrumentation and portable electronics demanding extended runtime and intelligent power supervision.
FAQ
What is the maximum continuous output current of the LTC1474CMS8#PBF?
The LTC1474CMS8#PBF delivers up to 250mA continuous output current at 3.3V under typical conditions (TA = 25°C, VIN = 5V–12V). Its peak switch current is factory-set to 325mA minimum (RSENSE = 0Ω) and can be reduced to 70mA using an external 1.1Ω sense resistor. Thermal derating applies above 70°C ambient.
Does the LTC1474CMS8#PBF support adjustable output voltages?
No, the LTC1474CMS8#PBF is a fixed 3.3V output variant. Adjustable versions exist (e.g., LTC1474CMS8#TR), but this specific part number integrates an internal resistive divider calibrated for 3.300V ±2%. Pin 1 (VOUT/VFB) is internally connected to the output and must not be externally biased.
How does the low-battery detector function in shutdown mode for the LTC1474CMS8#PBF?
The LTC1474CMS8#PBF's low-battery comparator remains fully active during shutdown: the internal 1.23V reference and comparator circuitry stay powered, allowing continuous monitoring of the voltage at Pin 3 (LBI). When LBI falls below 1.23V ±0.05V, Pin 2 (LBO) sinks current - enabling battery status alerts even while the main regulator is disabled.
What is the purpose of the SENSE pin (Pin 6) on the LTC1474CMS8#PBF?
Pin 6 (SENSE) monitors the total voltage drop across the internal 5Ω sense resistor plus any external RSENSE connected between Pins 6 and 7. When this voltage reaches 100mV, the current comparator triggers, ending the switch-on period. With RSENSE = 0Ω, the default peak current is 325mA - providing inherent short-circuit protection and enabling ripple/noise optimization.
Can the LTC1474CMS8#PBF operate with input voltages below 3V?
No - the absolute minimum input voltage for the LTC1474CMS8#PBF is 3V, as specified in Absolute Maximum Ratings and confirmed by functional operation data. Operation below 3V risks failure to start, regulation loss, or undefined behavior. For sub-3V inputs, consider the LTC3638 or similar micropower buck regulators.
LTC1474CMS8#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:
- 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#PBF FAQ
1.How can I place an order for LTC1474CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474CMS8#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 LTC1474CMS8#PBF reliable?
The price and inventory of LTC1474CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1474CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1474CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474CMS8#PBF?
LTC1474CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474CMS8#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 LTC1474CMS8#PBF?
For technical support, including LTC1474CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474CMS8#PBF requirements.
6.How does Aetrix verify that LTC1474CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1474CMS8#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 LTC1474CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1474CMS8#PBF?
All LTC1474CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474CMS8#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 LTC1474CMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1474CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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