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Analog Devices Inc. LTC1475CMS8#TRPBF
- Part No.:
- LTC1475CMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1475CMS8#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,509
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Product details
Overview
LTC1475CMS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with integrated P-channel MOSFET, 3.3V fixed 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 and is used in battery-powered portable instruments and wireless modems.
For engineers reviewing the LTC1475CMS8#TRPBF datasheet, LTC1475CMS8#TRPBF pinout, LTC1475CMS8#TRPBF application, or LTC1475CMS8#TRPBF equivalent, key selection criteria include its 3.3V fixed output, 10µA sleep-mode current, programmable peak current limit (325–400mA), 1.4Ω internal switch RDS(ON), and pushbutton-controlled run/shutdown functionality - all critical for ultra-low-power, space-constrained designs.
Technical Context
The LTC1475CMS8#TRPBF uses Burst Mode™ operation to maintain regulation while minimizing quiescent 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, tripping at 100mV to enforce peak current limits.
Unlike the LTC1474, the LTC1475CMS8#TRPBF implements pushbutton on/off control using dual-function pins: momentary ground on Pin 8 (ON) initiates run mode, while momentary ground on Pin 3 (LBI/OFF) triggers shutdown - both actions toggle an internal S/R latch. The low-battery comparator remains fully functional during shutdown, sinking current on Pin 2 (LBO) when Pin 3 falls below 1.23V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V), enabling direct replacement of LDOs without feedback divider design. |
| No-Load Supply Current | 10µA typical, allowing multi-year battery life in always-on sensor nodes with intermittent load activity. |
| Shutdown Current | 6µA typical, reducing system standby power to sub-microwatt levels when powered off via pushbutton. |
| Internal Switch RDS(ON) | 1.4Ω typical at VIN = 10V, limiting conduction loss to <100mW at 250mA output, supporting thermally constrained layouts. |
| Peak Switch Current Limit | 325–400mA (RSENSE = 0Ω), setting maximum inductor stress and short-circuit energy without external current-sense IC. |
| Feedback Reference Voltage | 1.230V ±2.5%, providing stable regulation point for both fixed and adjustable versions across temperature. |
| Low-Battery Threshold | 1.23V ±3%, enabling accurate battery end-of-life detection down to ~2.5V for single Li-ion or 3× alkaline cells. |
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; provides regulation error signal to internal comparator. |
| LBO (Pin 2) | Open-drain low-battery output | Sinks up to 0.7mA when LBI/OFF voltage drops below 1.23V - drives LED or microcontroller interrupt directly. |
| LBI/OFF (Pin 3) | Low-battery input / shutdown control | Dual-function pin: compares to 1.23V reference for battery monitoring; grounded momentarily to enter shutdown. |
| GND (Pin 4) | Power and signal ground reference | Common return path for switch current, feedback, and comparator circuits - must be low-impedance 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 | Monitors voltage across internal + optional external sense resistor; trips at 100mV to limit peak switch current. |
| VIN (Pin 7) | Main input supply | Accepts 4V–18V DC; powers internal circuitry and supplies gate drive for P-MOSFET switch. |
| ON (Pin 8) | Pushbutton run control | Momentary ground activates internal S/R latch to enable switching - no pull-up required; 100kΩ series resistor recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at light loads by alternating short switching bursts and deep-sleep cycles, achieving >92% efficiency at 1mA and preserving battery capacity. |
| Pushbutton on/off control | Eliminates need for external logic or microcontroller GPIO to manage power state - reduces BOM count and firmware complexity in handheld devices. |
| 100% duty-cycle capability | Enables dropout operation down to VOUT + 0.3V (e.g., 3.6V input → 3.3V output), extending usable battery range in declining-voltage applications. |
| Integrated low-battery detector | Remains fully operational during shutdown, allowing system-level battery monitoring without waking main regulator or consuming extra supply current. |
| Programmable current limit | Adjusts peak switch current from 325mA to <10mA via external RSENSE, optimizing inductor size, EMI, and ripple for specific load profiles. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver in GSM/GPRS handsets with single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator delivering up to 250mA with burst-mode efficiency >85% at 10mA load. Use Value: Extends talk time by minimizing no-load current (10µA) and enabling full shutdown (6µA) between transmission bursts. | Use Scenario: Supplying microcontroller, LCD driver, and analog front-end in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Fixed 3.3V power source with pushbutton on/off, low-battery alert (LBO), and 100% duty cycle for end-of-battery operation. Use Value: Eliminates separate power button circuitry and enables accurate battery fuel gauging without additional components. |
| Wireless Modems | Battery Chargers |
Use Scenario: Providing regulated 3.3V rail for LTE/Wi-Fi module in IoT edge gateways powered by 12V lead-acid or 4× AA batteries. IC Role / Device Role / Timing Role: High-input-range (4–18V) buck converter with programmable current limit to match modem peak current demands (≤200mA). Use Value: Avoids thermal derating at high VIN by limiting peak switch current, maintaining >90% efficiency across wide input range. | Use Scenario: Generating 3.3V auxiliary supply for charger management IC and status LEDs in multi-cell Li-ion charging stations. IC Role / Device Role / Timing Role: Secondary regulator isolated from main charging path, featuring shutdown control synchronized with charge cycle completion. Use Value: Enables zero-power standby when charging is complete, using LBI/OFF pin to detect full-charge voltage threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1475CS8#PBF | SO-8 package (4.9mm × 6.0mm), higher θJA (150°C/W), same electrical specs and pinout. | Less space-constrained PCBs; lower thermal performance requires larger copper area for 250mA continuous operation. | Select when MSOP assembly is unavailable or board layout favors SO-8 footprint compatibility. |
| TPS62231DRYR | 3MHz fixed-frequency PWM (vs Burst Mode), 2.5µA IQ, 3.3V fixed, 6-pin WSON, no LBO/LBI pins. | Lacks low-battery monitoring and pushbutton control; optimized for noise-sensitive digital loads rather than ultra-low-IQ battery systems. | Choose for higher switching frequency, smaller inductor, and tighter output ripple - but only if battery monitoring is handled externally. |
Compared with LTC1475CMS8#TRPBF, the LTC1475CS8#PBF offers identical functionality in a larger SO-8 package for easier prototyping, while the TPS62231DRYR trades ultra-low quiescent current and integrated battery monitoring for higher frequency and smaller passive components - making it suitable only when those features are secondary to size and ripple requirements.
Availability
LTC1475CMS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, and wireless modems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1475CMS8#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and industrial applications.
The LTC1475CMS8#TRPBF belongs to ADI's legacy Linear Technology DC/DC converter product line, designed specifically for ultra-low-power, battery-operated portable electronics requiring high efficiency across wide load ranges and integrated system-level functions like pushbutton control and battery monitoring.
FAQ
What is the maximum continuous output current of the LTC1475CMS8#TRPBF?
The LTC1475CMS8#TRPBF supports up to 250mA continuous output current at 3.3V with proper thermal management. Its peak switch current limit is programmable from 325mA (RSENSE = 0Ω) down to <10mA, but sustained 250mA operation requires adequate PCB copper area due to its 150°C/W junction-to-ambient thermal resistance in the MSOP package.
Does the LTC1475CMS8#TRPBF require an external current sense resistor?
No, the LTC1475CMS8#TRPBF does not require an external current sense resistor. With Pins 6 (SENSE) and 7 (VIN) shorted, it defaults to a 325–400mA peak current limit using its internal 5Ω sense element. An external resistor is optional and used only to reduce peak current for lower-noise or smaller-inductor designs.
How does pushbutton control work on the LTC1475CMS8#TRPBF?
The LTC1475CMS8#TRPBF uses two dedicated pins for pushbutton operation: grounding Pin 8 (ON) for >100ns sets the internal S/R latch to run mode, while grounding Pin 3 (LBI/OFF) for >100ns resets it to shutdown. Both actions are edge-triggered and do not require pull-up resistors - a 100kΩ series resistor is recommended on Pin 8 for ESD protection.
Can the LTC1475CMS8#TRPBF operate with input voltage below 4V?
No, the LTC1475CMS8#TRPBF has a minimum specified input voltage of 4V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4V may result in failure to regulate or undefined behavior; for sub-4V inputs, consider the LTC1474/LTC1475-ADJ variants with external feedback dividers or alternative regulators like the LTC3642.
Is the low-battery detector active during shutdown of the LTC1475CMS8#TRPBF?
Yes, the low-battery detector remains fully active during shutdown of the LTC1475CMS8#TRPBF. The internal 1.23V reference and comparator continue operating, allowing Pin 2 (LBO) to sink current whenever Pin 3 (LBI/OFF) falls below the 1.23V threshold - enabling real-time battery monitoring without waking the regulator.
LTC1475CMS8#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
LTC1475CMS8#TRPBF FAQ
1.How can I place an order for LTC1475CMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1475CMS8#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#TRPBF reliable?
The price and inventory of LTC1475CMS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1475CMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1475CMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1475CMS8#TRPBF?
LTC1475CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1475CMS8#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#TRPBF?
For technical support, including LTC1475CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1475CMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1475CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1475CMS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1475CMS8#TRPBF?
All LTC1475CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1475CMS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1475CMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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