My Inquiry
My Account
Analog Devices Inc. LTC1474CS8-5#TRPBF
- Part No.:
- LTC1474CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1474CS8-5#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 5V 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,455
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1474CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with internal P-channel MOSFET switch, fixed 5V output, and 8-lead SOIC package. It delivers up to 300mA output current, achieves >92% efficiency at 200mA with VIN = 10V, operates from 3V to 18V input, and draws only 10µA typical no-load supply current. It is used in battery-powered portable instruments requiring stable 5V rail generation with micropower shutdown.
For engineers reviewing the LTC1474CS8-5#TRPBF datasheet, LTC1474CS8-5#TRPBF pinout, LTC1474CS8-5#TRPBF application, or LTC1474CS8-5#TRPBF equivalent, key selection criteria include its 5V fixed output, 1.4Ω internal switch RDS(ON), programmable peak current limit (325–400mA), 100% duty-cycle low-dropout capability, and active-low micropower shutdown (6µA typ).
Technical Context
The LTC1474CS8-5#TRPBF uses Burst Mode™ operation to maintain regulation while minimizing quiescent current: it alternates between short energy bursts (switch on, inductor current ramp-up) and sleep cycles (switch off, capacitor supplies load). Its current-mode control employs an internal 5Ω sense resistor plus optional external RSENSE to set peak switch current at 100mV threshold.
It integrates a 1.23V reference, voltage comparator with 5mV hysteresis, low-battery detector (1.23V threshold, functional in shutdown), and logic-controlled RUN pin (0.7V threshold, 0.8µA source current). The 4.75µs minimum off-time extends to 65µs under short-circuit conditions to ensure inductor current decay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.000 V ±2% - tightly regulated for logic supply rails without external feedback divider. |
| Input Voltage Range | 3V to 18V - supports single-cell Li-ion, multi-cell alkaline/NiMH, and industrial 12V systems. |
| Max Output Current | 300 mA - achievable with internal current limit (325–400 mA peak) and proper external components. |
| No-Load Supply Current | 10 µA typical - enables multi-year battery life in standby for portable instrumentation. |
| Shutdown Current | 6 µA typical - ensures minimal drain during system sleep, critical for always-on sensors. |
| Switch RDS(ON) | 1.4 Ω at VIN = 10V - determines conduction loss and thermal rise at full load. |
| Feedback Voltage | 1.230 V ±2.5% - internal reference accuracy directly sets output tolerance in fixed versions. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 150°C/W junction-to-ambient thermal resistance, RoHS-compliant, tape-and-reel packaging (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage sense / feedback node | In fixed-5V version, internally connected to resistive divider; provides regulation point for voltage loop. |
| LBO (Pin 2) | Low-battery open-drain output | Sinks current when LBI < 1.23V; remains active in shutdown for battery monitoring during sleep. |
| LBI (Pin 3) | Low-battery input comparator | Compares external battery voltage (via resistor divider) to 1.23V reference; trip threshold 1.23V ±50mV. |
| GND (Pin 4) | Power and signal ground reference | Common return path for switch, feedback, and comparator circuits; requires low-impedance PCB connection. |
| SW (Pin 5) | Switch node | Drain of internal P-MOSFET; connects to cathode of external Schottky catch diode and inductor. |
| SENSE (Pin 6) | Current sense input | Monitors switch current via internal 5Ω + optional external RSENSE; trips at 100mV for overcurrent protection. |
| VIN (Pin 7) | Main power input | Accepts 3–18V input; supplies gate drive and internal circuitry; requires local 0.1µF ceramic decoupling. |
| RUN (Pin 8) | Logic-controlled enable | Active-high run control: open/high = normal operation; grounded = shutdown (6µA IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains regulation at light loads with 10µA typical no-load current, enabling >85% efficiency down to 1mA output. |
| 100% duty-cycle capability | Supports dropout as low as VOUT – VIN ≈ 0V, allowing operation near battery end-of-life (e.g., 5V out from 5.2V input). |
| Programmable peak current limit | Set from 325mA to 400mA via optional RSENSE, optimizing inductor size and ripple for specific load requirements. |
| Integrated low-battery detector | Operates continuously - even in shutdown - providing system-level battery health monitoring without external circuitry. |
| Short-circuit protection | Automatic foldback via current-mode control limits SW pin current to ≤750mA absolute max, preventing thermal runaway. |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver ICs from a single Li-ion cell (3.0–4.2V) with tight 5V rail tolerance. IC Role / Device Role / Timing Role: Primary 5V step-down regulator delivering regulated power with micropower shutdown during idle periods. Use Value: Extends talk time by maintaining >90% efficiency at 50–200mA loads and drawing only 10µA in standby. | Use Scenario: Supplying 5V to microcontroller, ADC, and LCD controller in handheld multimeters or gas detectors. IC Role / Device Role / Timing Role: Main system power converter with integrated low-battery warning to trigger display alerts before shutdown. Use Value: Eliminates need for separate supervisor IC; LBI/LBO pins provide direct battery monitoring with no added BOM cost. |
| Battery Chargers | Intrinsic Safety Applications |
Use Scenario: Generating 5V bias for charging control circuitry in USB-powered NiMH smart chargers. IC Role / Device Role / Timing Role: Auxiliary supply rail generator isolated from main charge path, supporting precise voltage sensing and LED indicators. Use Value: Enables accurate 5V reference for analog front-end circuits while consuming negligible current during charger standby. | Use Scenario: Providing intrinsically safe 5V power to sensor signal conditioning in hazardous-area gas monitors (Class I, Div 1). IC Role / Device Role / Timing Role: Energy-limited DC/DC stage with current limiting and thermal-safe operation per IEC 60079-11. Use Value: Built-in 400mA peak current limit and 750mA absolute switch rating support certified fault-current limitation without external fusing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EMS8E-5#TRPBF | Higher efficiency (95% typ), lower IQ (2.5µA), integrated soft-start, but requires external compensation and costs ~2× more. | Preferred for ultra-low-power IoT nodes where every µA matters; less suitable for cost-sensitive portable tools. | Select if extended battery life outweighs BOM cost and design complexity. |
| TPS62231DRYR | 3MHz fixed-frequency PWM (vs Burst Mode), 20µA IQ, 3–6.5V input, smaller 6-pin WSON package, but lacks low-battery detection. | Better for noise-sensitive analog circuits needing constant switching frequency; unsuitable where battery monitoring is required. | Choose when EMI filtering is critical and LBI/LBO functionality is not needed. |
Compared with LTC1474CS8-5#TRPBF, LTC3605EMS8E-5#TRPBF offers superior light-load efficiency and lower quiescent current but adds design overhead; TPS62231DRYR provides higher switching frequency and smaller footprint but omits integrated battery monitoring - making LTC1474CS8-5#TRPBF optimal for cost-constrained, battery-aware portable systems needing simplicity and built-in supervision.
Availability
LTC1474CS8-5#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, and battery chargers requiring stable component supply with long-term lifecycle support.
Supply support for LTC1474CS8-5#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 designs precision analog, mixed-signal, and power management ICs for high-reliability industrial, automotive, and communications applications.
The LTC1474 series was developed specifically for micropower, wide-input-range step-down conversion in battery-operated portable equipment - emphasizing ultra-low IQ, integrated supervision, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LTC1474CS8-5#TRPBF?
The LTC1474CS8-5#TRPBF has an absolute maximum input voltage rating of 20V, but its recommended operating range is 3V to 18V. Exceeding 18V may degrade long-term reliability or trigger internal protection mechanisms. The device maintains regulation across this full range, including 100% duty cycle operation near VIN = VOUT. Always observe derating guidelines in the datasheet's Absolute Maximum Ratings table when designing for high-temperature environments.
Does the LTC1474CS8-5#TRPBF require an external current sense resistor?
No, the LTC1474CS8-5#TRPBF does not require an external current sense resistor. It defaults to a 325–400mA peak current limit using its internal 5Ω sense element when SENSE (Pin 6) and VIN (Pin 7) are shorted. An external RSENSE is optional and used only to reduce peak current for lower-noise or lower-ripple designs - for example, setting IPEAK = 100mA with RSENSE = 0.75Ω. The LTC1474CS8-5#TRPBF functions fully without it.
Can the LTC1474CS8-5#TRPBF operate with a 3.3V input to deliver 5V output?
No, the LTC1474CS8-5#TRPBF is a step-down (buck) converter only and cannot boost voltage. Its minimum input voltage is 3V, but it requires VIN > VOUT to regulate - so 3.3V input is insufficient for 5V output. For 3.3V-to-5V conversion, a step-up (boost) regulator such as the LTC3530EDD-5#TRMPBF is required. The LTC1474CS8-5#TRPBF is designed for applications where input exceeds output, e.g., 9V battery to 5V rail.
How does the low-battery detector function in shutdown mode for the LTC1474CS8-5#TRPBF?
The low-battery detector in the LTC1474CS8-5#TRPBF remains fully operational during shutdown: the internal 1.23V reference and comparator continue drawing power from VIN, allowing LBI (Pin 3) monitoring and LBO (Pin 2) sinking to occur even when RUN (Pin 8) is grounded. This enables continuous battery voltage supervision without waking the main regulator - critical for systems that must log battery state or trigger wake-up events based on voltage thresholds while minimizing total system current.
What is the purpose of the RUN pin on the LTC1474CS8-5#TRPBF, and what voltage level disables the device?
The RUN pin (Pin 8) on the LTC1474CS8-5#TRPBF provides logic-level enable control: applying ≥0.7V (typical) enables normal operation, while grounding it places the device in micropower shutdown with 6µA typical supply current. The pin sources only 0.8µA when pulled low, allowing direct connection to microcontroller GPIO or open-collector drivers. Unlike the LTC1475, the LTC1474CS8-5#TRPBF does not support pushbutton toggle - RUN is strictly level-sensitive enable/disable.
LTC1474CS8-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LTC1474CS8-5#TRPBF FAQ
1.How can I place an order for LTC1474CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474CS8-5#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 LTC1474CS8-5#TRPBF reliable?
The price and inventory of LTC1474CS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1474CS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1474CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474CS8-5#TRPBF?
LTC1474CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474CS8-5#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 LTC1474CS8-5#TRPBF?
For technical support, including LTC1474CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474CS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC1474CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1474CS8-5#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 LTC1474CS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1474CS8-5#TRPBF?
All LTC1474CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474CS8-5#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 LTC1474CS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1474CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1474CS8-5#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
