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Analog Devices Inc. LTC1174IS8#TRPBF
- Part No.:
- LTC1174IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174IS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,383
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Product details
Overview
LTC1174IS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down and inverting DC/DC converter IC with internal 0.9 Ω P-channel MOSFET switch, pin-selectable 340 mA/600 mA current limit, and 130 µA standby current. It operates from 4 V to 18.5 V input, delivers regulated 5 V output (fixed version), and is used in battery-powered portable instruments requiring low-quiescent-power voltage conversion.
For engineers reviewing the LTC1174IS8#TRPBF datasheet, LTC1174IS8#TRPBF pinout, LTC1174IS8#TRPBF application, or LTC1174IS8#TRPBF equivalent, key selection criteria include its wide input range, micropower shutdown (1 µA), low-battery detection capability, constant off-time architecture, and compatibility with standard surface-mount inductors and Schottky catch diodes.
Technical Context
The LTC1174IS8#TRPBF implements a constant off-time current-mode control architecture with internal timing capacitor trimming, enabling frequency variation inversely proportional to (VIN − VOUT). Its operation alternates between continuous conduction mode and Burst Mode® at light loads to maintain high efficiency down to 10 mA output current.
It integrates a 1.25 V reference, voltage comparator (A1), current comparator (A2), and sleep-mode logic that disables unused circuitry to reduce quiescent current to 130 µA. The low-battery detector uses an external resistor divider on LBIN (Pin 3) referenced to 1.25 V, with hysteresis of 7.5–30 mV and LBOUT (Pin 2) sinking up to 1.2 mA when triggered.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 18.5 V - supports single- to multi-cell Li-ion, NiCd, and alkaline battery inputs without external regulators |
| Output Voltage | 5.00 V ±2.5% - fixed-output version (LTC1174-5) with load regulation ≤70 mV over 20–175 mA |
| Peak Efficiency | 94% - achieved at ~300 mA load with VIN = 9 V, L = 100 µH, IPGM = VIN |
| Quiescent Current | 130 µA - enables >1-year battery life in standby for 200 mAh coin cells |
| Shutdown Current | 1 µA - ensures negligible drain during system sleep or storage |
| Current Limit Options | 340 mA (IPGM = 0 V) or 600 mA (IPGM = VIN) - selectable via single pin for optimized inductor sizing |
| Switch RDS(ON) | 0.9 Ω typical - limits conduction loss at 350 mA output, enabling >90% efficiency at 6 V input |
Pinout & Package
Package: 8-lead plastic SO (S8), RoHS-compliant, lead-free (#PBF), tape-and-reel (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Feedback input / regulated output sense | Connects to internal resistive divider for fixed 5 V output; open for adjustable configurations |
| LBOUT (Pin 2) | Low-battery indicator open-drain output | Sinks up to 1.2 mA when LBIN falls below 1.25 V; indeterminate during shutdown |
| LBIN (Pin 3) | Inverting input of low-battery comparator | Accepts external resistor divider from VIN; trip point set by 1.25 V reference and hysteresis |
| GND (Pin 4) | Power and signal ground reference | Return path for switch current, feedback, and comparator circuits; must be low-impedance |
| SW (Pin 5) | Drain of internal P-channel MOSFET | Connects directly to cathode of Schottky catch diode and inductor; high dv/dt node |
| VIN (Pin 6) | Main input supply connection | Decoupled with ≥10 µF electrolytic + 0.1 µF ceramic; absolute max 18.5 V for HV variant |
| IPGM (Pin 7) | Current limit programming input | Pull to VIN for 600 mA limit, to GND for 340 mA limit; high-impedance, must not float |
| SHUTDOWN (Pin 8) | Active-low enable control | Pull to GND for 1 µA shutdown; requires pull-up to VIN during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time architecture | Enables automatic frequency scaling with input/output voltage, eliminating need for external compensation |
| Burst Mode® operation | Reduces quiescent current to 130 µA at light loads while maintaining ±2.5% output regulation |
| Integrated 0.9 Ω P-MOSFET | Eliminates external high-side switch, reducing BOM count and PCB area in compact 5 V buck designs |
| Pin-selectable current limit | Supports optimal inductor selection for 340 mA or 600 mA peak current without changing layout |
| Low-battery detection with hysteresis | Provides reliable undervoltage warning using only two external resistors and no additional ICs |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Battery-powered glucose meter operating from two AA alkaline cells (2.4–3.2 V) with boost+buck architecture to generate stable 3.3 V and 5 V rails. IC Role / Device Role / Timing Role: LTC1174IS8#TRPBF serves as the 5 V step-down stage after initial boost, delivering up to 175 mA with <130 µA quiescent draw during sensor idle cycles. Use Value: Enables >2-year battery life with 2000 mAh alkaline cells due to micropower sleep mode and high light-load efficiency. | Use Scenario: Digital multimeter with LCD display, microcontroller, and analog front-end requiring isolated 5 V and –5 V supplies from a 9 V battery. IC Role / Device Role / Timing Role: LTC1174IS8#TRPBF configured as inverting converter generates –5 V rail with 45 mA output, synchronized to main 5 V buck stage. Use Value: Eliminates need for separate inverting charge-pump IC, reducing component count and EMI from dual switching stages. |
| Memory Backup Power Supply | Industrial Data Logger |
Use Scenario: SRAM backup circuit powered from main 5 V rail, maintaining data during AC power failure using supercapacitor energy storage. IC Role / Device Role / Timing Role: LTC1174IS8#TRPBF operates in low-dropout mode to regulate 3.3 V from decaying 5 V bus, sustaining memory voltage until capacitor depletes. Use Value: Maintains regulation down to VIN = 3.6 V, extending usable backup time by 35% versus fixed-LDO solutions. | Use Scenario: Remote environmental monitor deployed in field enclosures, powered by 4×NiMH cells (4.8–6.0 V), logging temperature/humidity every 10 minutes. IC Role / Device Role / Timing Role: LTC1174IS8#TRPBF supplies 5 V to microcontroller and sensors, entering 1 µA shutdown between measurements. Use Value: Achieves 5-year operational life on 2500 mAh NiMH pack with duty-cycled operation and programmable current limit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1931IS8#TRPBF | Higher switching frequency (1.2 MHz), smaller inductor requirement, but higher IQ (1.1 mA active) | Better suited for space-constrained designs needing <10 µH inductors; less ideal for ultra-low-power battery life | Select when board area is critical and average load >50 mA; avoid if standby current <200 µA is required |
| TPS62231DRVR | 3 MHz synchronous buck, 22 µA IQ, but fixed 3.3 V only and no inverting capability | Lacks low-battery detection, inverting topology support, and wide VIN range; requires external components for –5 V generation | Choose for high-efficiency 3.3 V point-of-load where inverting function and battery monitoring are unnecessary |
Compared with LT1931IS8#TRPBF and TPS62231DRVR, the LTC1174IS8#TRPBF offers unique integration of inverting conversion, micropower shutdown, and programmable current limiting - making it irreplaceable in legacy battery-powered instrumentation where these features are mandatory.
Availability
LTC1174IS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, memory backup power supplies, and industrial data loggers requiring stable component supply across extended product lifecycles.
Supply support for LTC1174IS8#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 technical and manufacturing continuity for all Linear DC/DC converter products.
The LTC1174IS8#TRPBF belongs to Linear's legacy high-efficiency, micropower DC/DC converter family designed specifically for battery-operated portable instrumentation and low-duty-cycle sensing systems.
FAQ
What is the maximum input voltage rating for the LTC1174IS8#TRPBF?
The LTC1174IS8#TRPBF is rated for a maximum input voltage of 18.5 V, as specified in the Absolute Maximum Ratings table for the LTC1174HV variant. This rating applies to the LTC1174IS8#TRPBF, which is the industrial-grade (-40°C to 85°C) version of the LTC1174HV-5 fixed-output converter. Exceeding this voltage risks permanent damage to the internal P-channel MOSFET switch.
Does the LTC1174IS8#TRPBF support inverting (negative output) configurations?
Yes, the LTC1174IS8#TRPBF supports inverting configurations. Although it is a fixed 5 V output part, its internal architecture allows reconfiguration as a negative-output converter by grounding the VOUT pin and taking output from GND - as demonstrated in Typical Application TA06. The LTC1174IS8#TRPBF retains full functionality including current limiting and low-battery detection in this mode.
How does the IPGM pin affect current limiting on the LTC1174IS8#TRPBF?
The IPGM pin on the LTC1174IS8#TRPBF selects between two peak inductor current limits: 340 mA when pulled to GND, and 600 mA when pulled to VIN. This setting directly determines the maximum switch current before cycle-by-cycle current limiting activates. The LTC1174IS8#TRPBF datasheet confirms both thresholds apply across the full operating temperature range and are trimmed at wafer sort.
What is the purpose of the LBIN and LBOUT pins on the LTC1174IS8#TRPBF?
The LBIN (Pin 3) and LBOUT (Pin 2) pins implement a precision low-battery detector on the LTC1174IS8#TRPBF. LBIN accepts a resistor divider from VIN to compare against an internal 1.25 V reference; when the divided voltage drops below this threshold, LBOUT sinks up to 1.2 mA to drive an LED or microcontroller interrupt. This function remains active during normal operation but is disabled in shutdown mode.
Can the LTC1174IS8#TRPBF operate in dropout mode, and how does it behave?
Yes, the LTC1174IS8#TRPBF operates in dropout mode when VIN approaches VOUT. In this condition, the internal P-channel MOSFET remains continuously on, functioning like a low-dropout linear regulator with RDS(ON) ≈ 0.9 Ω. Output voltage follows VIN minus ILOAD × RDS(ON), preserving regulation without oscillation or shutdown - a key advantage for battery-powered systems where input voltage decays gradually.
LTC1174IS8#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-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 18.5V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 13V
- Current - Output:
- 340mA, 600mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1174IS8#TRPBF FAQ
1.How can I place an order for LTC1174IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174IS8#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 LTC1174IS8#TRPBF reliable?
The price and inventory of LTC1174IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1174IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174IS8#TRPBF?
LTC1174IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174IS8#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 LTC1174IS8#TRPBF?
For technical support, including LTC1174IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1174IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1174IS8#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 LTC1174IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1174IS8#TRPBF?
All LTC1174IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174IS8#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 LTC1174IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1174IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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