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Analog Devices Inc. LTC1475CMS8-5#TRPBF
- Part No.:
- LTC1475CMS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1475CMS8-5#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 5V 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,212
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Product details
Overview
LTC1475CMS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with internal P-channel MOSFET, fixed 5V output, 8-pin MSOP package, 10µA typical no-load supply current, and pushbutton on/off control. It delivers up to 300mA output in battery-powered portable instruments and wireless modems requiring stable 5V rail generation from 4V–18V inputs.
For engineers reviewing the LTC1475CMS8-5#TRPBF datasheet, LTC1475CMS8-5#TRPBF pinout, LTC1475CMS8-5#TRPBF application, or LTC1475CMS8-5#TRPBF equivalent, key selection criteria include its 5V fixed output, 10µA sleep-mode current, programmable peak current limit (325–400mA), 100% duty-cycle low-dropout capability, and integrated low-battery comparator active during shutdown.
Technical Context
The LTC1475CMS8-5#TRPBF employs Burst Mode™ operation to maintain high efficiency across light-to-moderate loads, using short energy bursts followed by deep-sleep cycles where only the voltage comparator, 1.23V reference, and low-battery comparator remain active. Its internal current sense architecture monitors switch current via a 5% current mirror and 5Ω internal resistor, tripping at 100mV threshold.
Shutdown is controlled by an internal S/R flip-flop: momentary ground on Pin 8 (ON) initiates run mode; momentary ground on Pin 3 (LBI/OFF) triggers shutdown. The low-battery detector remains fully functional in shutdown, comparing LBI voltage to the 1.23V reference and driving open-drain LBO (Pin 2) to sink current when threshold is breached.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.000 V ±2% - eliminates external feedback divider, simplifies layout and reduces BOM count. |
| No-Load Supply Current | 10 µA typical - enables multi-year battery life in always-on sensor nodes and remote monitoring devices. |
| Peak Switch Current Limit | 325–400 mA (RSENSE = 0 Ω) - sets maximum inductor current for optimized size/efficiency trade-off without external sense resistor. |
| Input Voltage Range | 4 V to 18 V - supports single-cell Li-ion (4.2V max), dual-cell alkaline (up to 3V × 6), and industrial 12V rails. |
| Switch On-Resistance | 1.4 Ω typical at VIN = 10 V - determines conduction loss and thermal rise under full load; enables >92% peak efficiency. |
| Feedback Reference Voltage | 1.230 V ±2.4% - internal precision bandgap used for output regulation and low-battery detection. |
| Shutdown Supply Current | 6 µA typical - minimizes standby drain in systems requiring long-term storage or infrequent wake-up. |
Pinout & Package
Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback input | Internally connected to 5V resistive divider; provides regulated 5V output without external components. |
| LBO (Pin 2) | Low-battery open-drain output | Sinks up to 0.7 mA when LBI < 1.23 V; compatible with microcontroller GPIO interrupt inputs. |
| LBI/OFF (Pin 3) | Low-battery input / shutdown control | Dual-function pin: compares battery voltage to 1.23 V reference; momentary ground forces shutdown. |
| GND (Pin 4) | Power and signal ground reference | Common return path for switch current, feedback, and comparator circuits; requires low-impedance PCB connection. |
| SW (Pin 5) | Drain of internal P-MOSFET power switch | Connects directly to cathode of external Schottky catch diode; carries pulsed inductor current up to 750 mA absolute max. |
| SENSE (Pin 6) | Current sense input | Monitors switch current via internal 5% current mirror; optional external resistor programs peak current limit between 10 mA and 400 mA. |
| VIN (Pin 7) | Main input supply | Accepts 4–18 V DC; powers internal circuitry and supplies gate drive for P-MOSFET; requires local 0.1 µF ceramic decoupling. |
| ON (Pin 8) | Pushbutton run control input | Momentary ground initiates run mode; internal pull-up ensures default shutdown; requires 100 kΩ series resistor for ESD protection. |
Key Features
| Feature | Design Value |
|---|---|
| Pushbutton on/off control | Eliminates need for external logic or microcontroller I/O to manage power sequencing in handheld devices. |
| Burst Mode™ operation | Maintains >85% efficiency at 1 mA load while drawing only 10 µA quiescent current - critical for IoT endpoint longevity. |
| 100% duty-cycle capability | Supports dropout as low as VIN – VOUT ≈ 0 V - enables regulation down to ~5.05 V input with minimal voltage headroom. |
| Integrated low-battery comparator | Remains active in shutdown, enabling battery monitoring without system wake-up - reduces firmware complexity and power overhead. |
| Programmable current limit | Adjusts peak switch current from 10 mA to 400 mA using single external resistor - optimizes inductor size and ripple for specific load profiles. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single Li-ion cell with dynamic load ranging from 10 µA (sleep) to 250 mA (transmit). IC Role / Device Role / Timing Role: Primary 5V step-down regulator providing clean, efficient, and ultra-low-quiescent power to mixed-signal subsystems. Use Value: Burst Mode™ extends talk time by >30% vs. conventional PWM converters at light loads; pushbutton control enables one-button power cycling. | Use Scenario: Supplying 5V to microcontroller, ADC, and LCD backlight in handheld multimeter operating from two AA alkaline cells (3.0 V–3.2 V fresh, down to 1.8 V per cell). IC Role / Device Role / Timing Role: Main system regulator delivering regulated 5V despite wide input variation and intermittent high-current pulses during measurement. Use Value: 100% duty cycle allows regulation until battery reaches ~5.05 V; low-battery comparator alerts user before cutoff, preventing data loss. |
| Battery Chargers | Intrinsic Safety Applications |
Use Scenario: Generating isolated 5V bias for charger controller IC and status LEDs in USB-powered Li-ion charger for medical wearables. IC Role / Device Role / Timing Role: Auxiliary power supply ensuring precise 5V reference for charge voltage sensing and LED driver logic. Use Value: Fixed 5V output eliminates calibration drift; 6 µA shutdown current prevents parasitic drain during storage or transport. | Use Scenario: Powering intrinsically safe (IS) loop-powered sensors in hazardous environments where energy limitation and fault tolerance are mandatory. IC Role / Device Role / Timing Role: Energy-limited DC/DC stage enforcing strict current and voltage boundaries per IEC 60079-11. Use Value: Programmable current limit (via RSENSE) enforces ≤100 mA fault current; short-circuit protection and thermal shutdown ensure compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1475CS8-5#PBF | SO-8 package (4.9 mm × 6.0 mm); higher θJA (150°C/W); same electrical specs and pinout. | Preferred for through-hole prototyping or legacy board compatibility; less space-efficient than MSOP. | Select when board real estate is not constrained and SO-8 footprint is already established. |
| TPS62231DRVR | 3 MHz fixed-frequency PWM; 20 µA IQ; 3–5.5 V input; 5V output; 350 mA max; 6-pin WSON. | Higher switching frequency enables smaller inductors/caps; lacks low-battery comparator and pushbutton control. | Choose for compact designs needing faster transient response but no battery monitoring or mechanical power toggle. |
Compared with LTC1475CMS8-5#TRPBF, the LTC1475CS8-5#PBF offers identical functionality in a larger SO-8 package, while the TPS62231DRVR trades burst-mode efficiency and integrated monitoring for higher frequency and smaller passive components - making it suitable for space-constrained apps without shutdown-aware battery management.
Availability
LTC1475CMS8-5#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, battery chargers, intrinsic safety systems, and wireless modems requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC1475CMS8-5#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 maintains full product support, documentation, and manufacturing continuity for all Linear power management ICs.
The LTC1475CMS8-5#TRPBF belongs to the LTC1474/LTC1475 family of micropower step-down converters designed specifically for battery-operated systems demanding ultra-low quiescent current, robust shutdown control, and integrated system monitoring functions.
FAQ
What is the maximum continuous output current of the LTC1475CMS8-5#TRPBF?
The LTC1475CMS8-5#TRPBF supports up to 300 mA continuous output current under typical conditions (VIN = 10 V, TA = 25°C, proper thermal layout). Peak switch current is internally limited to 325–400 mA depending on RSENSE configuration. Derating is required above 70°C ambient or with poor PCB copper area, as the MSOP package has θJA = 150°C/W.
Does the LTC1475CMS8-5#TRPBF require an external feedback resistor network?
No, the LTC1475CMS8-5#TRPBF does not require an external feedback resistor network. It is a fixed 5V output variant with internal resistive divider connected to the VOUT/VFB pin (Pin 1), delivering 5.000 V ±2% without any external components - reducing design complexity and component count.
How does pushbutton control work on the LTC1475CMS8-5#TRPBF?
The LTC1475CMS8-5#TRPBF uses two dedicated pins for pushbutton control: ON (Pin 8) initiates run mode when momentarily grounded, and LBI/OFF (Pin 3) triggers shutdown when momentarily grounded. An internal S/R latch retains state between presses, enabling true toggle behavior without external logic or microcontroller intervention.
Can the LTC1475CMS8-5#TRPBF operate with input voltage below 5V?
No, the LTC1475CMS8-5#TRPBF requires minimum 4V input but cannot regulate 5V output when VIN falls below ~5.05 V due to P-MOSFET RDS(ON) and dropout constraints. However, its 100% duty-cycle capability allows regulation down to VIN ≈ VOUT + (ILOAD × RDS(ON)), supporting operation as low as ~5.05 V at full load - insufficient for sub-5V inputs.
Is the low-battery comparator active during shutdown of the LTC1475CMS8-5#TRPBF?
Yes, the low-battery comparator remains fully active during shutdown of the LTC1475CMS8-5#TRPBF. It continuously compares the voltage on LBI/OFF (Pin 3) to the internal 1.23 V reference and drives LBO (Pin 2) low when the threshold is crossed - enabling battery monitoring without waking the main system or consuming additional quiescent current.
LTC1475CMS8-5#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):
- 5V
- 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
LTC1475CMS8-5#TRPBF FAQ
1.How can I place an order for LTC1475CMS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1475CMS8-5#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 LTC1475CMS8-5#TRPBF reliable?
The price and inventory of LTC1475CMS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1475CMS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1475CMS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1475CMS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1475CMS8-5#TRPBF?
LTC1475CMS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1475CMS8-5#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 LTC1475CMS8-5#TRPBF?
For technical support, including LTC1475CMS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1475CMS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC1475CMS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1475CMS8-5#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 LTC1475CMS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1475CMS8-5#TRPBF?
All LTC1475CMS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1475CMS8-5#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 LTC1475CMS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1475CMS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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