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Analog Devices Inc. LTC1474IS8#TRPBF
- Part No.:
- LTC1474IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1474IS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,016
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Product details
Overview
LTC1474IS8#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 3.3V output, and industrial-grade temperature rating (–40°C to +85°C). It delivers up to 250mA output current, achieves >92% peak efficiency at 10V input, features 10µA typical no-load supply current, and supports 4V–18V input range - ideal for battery-powered portable instrumentation and wireless modems.
For engineers reviewing the LTC1474IS8#TRPBF datasheet, LTC1474IS8#TRPBF pinout, LTC1474IS8#TRPBF application, or LTC1474IS8#TRPBF equivalent, key selection considerations include its 3.3V fixed output, 8-lead SO package, programmable current limit (325–400mA), 1.23V internal reference, and low-battery detector functional during shutdown.
Technical Context
The LTC1474IS8#TRPBF employs Burst Mode™ operation to maintain high efficiency across light-to-moderate loads by alternating short switching bursts with ultra-low-power sleep cycles (9µA typical). Its peak-current control architecture uses an internal 5Ω sense element plus optional external RSENSE to set trip threshold at 100mV, enabling precise IPEAK programming from 10mA to 400mA.
It integrates a 1.23V bandgap reference, open-drain low-battery comparator (LBO) with 1.23V threshold on LBI, and logic-controlled RUN pin for micropower shutdown (6µA typical). The internal 1.4Ω PMOS switch enables 100% duty-cycle operation for ultra-low dropout, and the 4.75µs off-time scales up to 65µs under short-circuit conditions to ensure safe inductor current decay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V), regulated via internal 1.23V reference and resistor divider |
| Input Voltage Range | 4V to 18V - supports single-cell Li-ion, multi-cell alkaline/NiMH, and wide industrial rails |
| Max Output Current | 250mA at 3.3V - limited by thermal design and 400mA peak switch current (RSENSE = 0Ω) |
| No-Load Supply Current | 10µA typical - enables multi-year battery life in always-on sensor nodes |
| Shutdown Current | 6µA typical - maintains low-battery detection active while disabling all switching circuitry |
| Switch On-Resistance | 1.4Ω typical at VIN = 10V - determines conduction loss and thermal rise at full load |
| Feedback Reference | 1.230V ±2.4% - sets output accuracy and enables adjustable versions via external resistors |
| Low-Battery Threshold | 1.23V ±3% on LBI pin - triggers LBO sink output even during shutdown for system-level battery monitoring |
Pinout & Package
Package: 8-lead plastic SO (Small Outline), 150°C/W junction-to-ambient thermal resistance, RoHS-compliant, tape-and-reel (TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT/VFB (Pin 1) | Output voltage feedback node | Internally connected to 3.3V divider; serves as regulation point and error amplifier input |
| LBO (Pin 2) | Low-battery open-drain output | Sinks ≥0.45mA when LBI < 1.23V; remains active in shutdown for battery monitoring |
| LBI (Pin 3) | Low-battery input comparator | Compares external voltage divider to 1.23V reference; trip hysteresis = 5mV |
| GND (Pin 4) | Power and signal ground reference | Common return path for switch, feedback, and comparator circuits; requires low-impedance layout |
| SW (Pin 5) | Switch node | Drain of internal PMOS power switch; connects directly to cathode of external Schottky diode |
| SENSE (Pin 6) | Current sense input | Monitors switch current via internal 5Ω + optional RSENSE; trips at 100mV total drop |
| VIN (Pin 7) | Main input supply | Accepts 4V–18V; powers internal bias, gate driver, and reference; bypass with 0.1µF ceramic |
| RUN (Pin 8) | Logic-controlled enable | Ground = shutdown (6µA IQ); open/high = active; requires no pull-up for default run mode |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains >85% efficiency at 1mA load by cycling between microsecond bursts and 9µA sleep mode |
| 100% duty-cycle capability | Enables dropout <100mV at full load - critical for Li-ion end-of-discharge operation |
| Programmable peak current limit | Adjustable from 10mA to 400mA using RSENSE, enabling optimized inductor sizing and ripple control |
| Active low-battery detection in shutdown | LBO sinks current when LBI falls below 1.23V - allows host MCU to monitor battery without waking regulator |
| Integrated 1.4Ω PMOS switch | Eliminates external high-side switch; reduces BOM count and PCB area vs. controller-based solutions |
| Industrial temperature grade | Specified from –40°C to +85°C ambient - qualified for extended-life portable medical and industrial sensors |
Applications
| Cellular Telephones | Portable Instruments |
|---|---|
|
Use Scenario: Powering baseband processor and RF transceiver from single Li-ion cell (3.0V–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator delivering 250mA with ultra-low quiescent current to extend talk time. Use Value: 10µA no-load IQ enables >100-hour standby; Burst Mode maintains >90% efficiency at 10mA sleep current. |
Use Scenario: Supplying 3.3V to microcontroller, ADC, and LCD in handheld multimeter or gas detector. IC Role / Device Role / Timing Role: Main system regulator with integrated low-battery warning (LBO) for user alert before shutdown. Use Value: LBI/LBO functionality operates during shutdown, allowing battery state monitoring without regulator wake-up. |
| Wireless Modems | Battery Chargers |
|
Use Scenario: Providing stable 3.3V rail to LTE-M/NB-IoT modem in asset tracker with coin-cell backup. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting wide input (4V–18V) from primary battery or USB input. Use Value: 4V–18V input range accommodates both Li-ion packs and 12V wall adapters; 1.4Ω RDS(ON) minimizes heat at 250mA. |
Use Scenario: Generating 3.3V auxiliary rail for charger management IC and status LEDs in smart battery pack. IC Role / Device Role / Timing Role: Secondary regulator powered from main charging rail, with shutdown controlled by host charger IC. Use Value: RUN pin enables synchronous power sequencing; 6µA shutdown IQ prevents parasitic drain on charged battery. |
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; 300mA max; 22µA IQ | Higher switching frequency enables smaller inductors but higher light-load losses; less suitable for multi-year battery life | Prefer LTC1474IS8#TRPBF for sub-100µA average IQ requirements; choose TPS62231DRYR only if EMI-sensitive or size-constrained designs demand 3MHz operation |
| MAX17222ETA+ | Hysteretic 1.2MHz operation; 0.7V–5.5V input; 300mA max; 1.6µA IQ; no LBI/LBO pins | Ultra-low IQ benefits extreme low-power IoT, but lacks integrated battery monitoring - requires external comparator | LTC1474IS8#TRPBF is superior when system-level low-battery signaling is required; MAX17222ETA+ fits where minimal IQ dominates and battery sensing is handled externally |
Compared with TPS62231DRYR and MAX17222ETA+, the LTC1474IS8#TRPBF uniquely combines industrial temperature rating, integrated low-battery comparator with shutdown-mode operation, and sub-10µA no-load IQ - making it optimal for battery-powered instrumentation requiring long service life and autonomous battery health awareness.
Availability
LTC1474IS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable instruments, and wireless modems requiring stable component supply with guaranteed long-term industrial-grade availability.
Supply support for LTC1474IS8#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 precision analog and power management ICs for demanding industrial, automotive, and communications applications.
The LTC1474IS8#TRPBF belongs to Linear's legacy high-efficiency, low-IQ DC/DC converter family, designed specifically for battery-powered portable equipment where runtime, thermal performance, and system-level power supervision are critical.
FAQ
What is the maximum continuous output current of the LTC1474IS8#TRPBF?
The LTC1474IS8#TRPBF delivers up to 250mA continuous output current at 3.3V under typical thermal conditions (SO-8 package, 25°C ambient, standard PCB layout). This is constrained by internal power dissipation limits and the 400mA peak switch current specification. Derating is required above 60°C ambient to maintain reliability, and actual achievable current depends on input voltage, inductor DCR, and PCB copper area.
Does the LTC1474IS8#TRPBF support adjustable output voltage?
No, the LTC1474IS8#TRPBF is a fixed 3.3V output version. Adjustable output is available only in the LTC1474-ADJ variants (e.g., LTC1474CS8#PBF), which require external resistor dividers on the VFB pin. The LTC1474IS8#TRPBF has internal feedback resistors trimmed to deliver 3.3V ±2%, eliminating external components but precluding voltage adjustment.
How does the low-battery detector function during shutdown on the LTC1474IS8#TRPBF?
The low-battery detector in the LTC1474IS8#TRPBF remains fully operational during shutdown: the internal 1.23V reference and comparator continue running, so LBO will sink current whenever the voltage on LBI falls below 1.23V - even with RUN pin grounded and the regulator fully disabled. This enables host systems to monitor battery health without waking the main power rail.
What is the purpose of the SENSE pin on the LTC1474IS8#TRPBF?
The SENSE pin (Pin 6) on the LTC1474IS8#TRPBF provides access to the internal current-sense node used for peak-current limiting. When shorted to VIN (RSENSE = 0Ω), it defaults to a 325–400mA trip threshold. Adding an external resistor between SENSE and VIN lowers the threshold linearly (e.g., 1.1Ω yields ~75mA), enabling optimization for lower-current applications and reduced output ripple.
Can the LTC1474IS8#TRPBF operate with input voltage below 4V?
No - the absolute minimum input voltage for reliable operation of the LTC1474IS8#TRPBF is 4V, as specified in the datasheet's operating conditions. Although the absolute maximum rating allows VIN down to –0.3V, startup and regulation are not guaranteed below 4V. For sub-4V inputs, consider the LTC1475-3.3 or other regulators with lower VIN(min) such as the LTC3620.
LTC1474IS8#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:
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1474IS8#TRPBF FAQ
1.How can I place an order for LTC1474IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1474IS8#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 LTC1474IS8#TRPBF reliable?
The price and inventory of LTC1474IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1474IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1474IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1474IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1474IS8#TRPBF?
LTC1474IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1474IS8#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 LTC1474IS8#TRPBF?
For technical support, including LTC1474IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1474IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1474IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1474IS8#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 LTC1474IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1474IS8#TRPBF?
All LTC1474IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1474IS8#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 LTC1474IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1474IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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