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Analog Devices Inc. LTC1174CS8#TRPBF
- Part No.:
- LTC1174CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174CS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,772
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Product details
Overview
LTC1174CS8#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 and delivers regulated 5 V output, optimized for portable battery-powered equipment requiring low-noise, low-quiescent-power conversion.
For engineers reviewing the LTC1174CS8#TRPBF datasheet, LTC1174CS8#TRPBF pinout, LTC1174CS8#TRPBF application, or LTC1174CS8#TRPBF equivalent, key selection criteria include its constant off-time architecture, integrated low-battery detector (1.25 V threshold), micropower shutdown (1 µA), and compatibility with standard surface-mount inductors and Schottky catch diodes in compact SO-8 layouts.
Technical Context
The LTC1174CS8#TRPBF implements a constant off-time (COT) control architecture with wafer-sort-trimmed 4 µs off-time, enabling frequency variation with input-output voltage differential. Its internal 1.25 V reference feeds a voltage comparator (A1) for output regulation and a current comparator (A2) sensing peak inductor current via an external 0.1 Ω sense resistor.
Burst Mode® operation automatically engages under light load to reduce quiescent current from 450–600 µA active mode to 130–180 µA sleep mode, while maintaining regulation via hysteretic voltage control. The IPGM pin selects between two current-limit thresholds (340 mA or 600 mA), and LBIN/LBOUT pins implement a precision low-battery comparator with 7.5–30 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00 V ±2.5% (LTC1174-5 variant); enables direct replacement of 7805 in low-power systems |
| Input Voltage Range | 4 V to 18.5 V (HV version); supports 4×NiCd, 3–4×Li-ion, or wide industrial rails without external LDO pre-regulation |
| Peak Efficiency | Up to 94% at 300 mA load; minimizes thermal stress and extends battery runtime in portable instruments |
| Standby Current | 130–180 µA; allows >1-year shelf life in memory backup or remote sensor applications |
| Shutdown Current | 1–10 µA; enables ultra-low-power wake-on-event architectures with external microcontroller control |
| Switch RDS(ON) | 0.75–1.30 Ω at VIN = 9 V; reduces conduction loss and improves efficiency at medium loads |
| Current Limit Options | Pin-selectable 340 mA (IPGM = 0 V) or 600 mA (IPGM = VIN); permits optimization for inductor size vs. peak output capability |
Pinout & Package
Package: 8-lead plastic SO (SO-8), 150°C/W junction-to-ambient thermal resistance, RoHS-compliant lead-free (#PBF) construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Feedback input / regulated output sense | Internal resistive divider sets 5 V output; connects to output capacitor for closed-loop regulation |
| LBOUT (Pin 2) | Open-drain low-battery indicator output | Sinks up to 1.5 mA when LBIN falls below 1.25 V; drives LED or MCU interrupt pin directly |
| LBIN (Pin 3) | Inverting input of low-battery comparator | Accepts external resistive divider from VIN; trip point set by ratio relative to 1.25 V reference |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, feedback, and comparator circuits; requires low-impedance PCB plane |
| SW (Pin 5) | Drain of internal P-channel MOSFET switch | Connects to cathode of external Schottky diode and inductor; high dv/dt node requiring tight layout |
| VIN (Pin 6) | Main input supply connection | Accepts 4–18.5 V; must be decoupled with ≥10 µF low-ESR capacitor and 0.1 µF ceramic near pin |
| IPGM (Pin 7) | Current limit programming input | Logic-level select: 0 V → 340 mA limit; VIN → 600 mA limit; high-impedance, must not float |
| SHUTDOWN (Pin 8) | Active-low enable/disable control | Pull to GND for 1 µA shutdown; pull to VIN for normal operation; high-impedance, must not float |
Key Features
| Feature | Design Value |
|---|---|
| Only four external components required | Enables complete 5 V buck converter with inductor, Schottky diode, input/output capacitors-reducing BOM count and board area |
| Low-battery detector with hysteresis | 1.25 V threshold with 7.5–30 mV hysteresis prevents chatter during battery sag; eliminates need for external supervisor IC |
| Short-circuit protection | Automatic current limiting and extended off-time prevent thermal runaway during output faults-no external current-sense amplifier needed |
| Optimized for 5 V to –5 V inverting operation | Supports negative rail generation with same component count as buck; ideal for RS-232 or LCD bias supplies |
| Distributed power system compatibility | Stable operation across wide input range and load transients makes it suitable for intermediate bus architectures in multi-rail embedded systems |
Applications
| Battery-Powered Portable Instruments | Memory Backup Supply |
|---|---|
Use Scenario: Handheld multimeter powered by 4×AA alkaline cells (6–9 V), requiring stable 5 V for microcontroller and ADC. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 5 V from varying battery voltage; provides Burst Mode® efficiency at standby. Use Value: 94% peak efficiency and 130 µA sleep current extend battery life beyond 500 hours; low-battery detection alerts user before measurement drift occurs. | Use Scenario: SRAM retention circuit in industrial PLC retaining configuration during AC power loss. IC Role / Device Role / Timing Role: Standby DC/DC converter supplying 5 V from backup lithium coin cell (3 V) or supercapacitor (2.5–5.5 V). Use Value: 1 µA shutdown current preserves backup energy for >10 years; pin-selectable current limit accommodates small inductors for space-constrained modules. |
| 5V to –5V Inverting Converter | Low-Noise 3.3V/5V Point-of-Load |
Use Scenario: RS-232 transceiver interface requiring dual ±5 V rails from single 5 V system supply. IC Role / Device Role / Timing Role: Inverting DC/DC converter generating –5 V output referenced to system ground; uses GND pin as output terminal. Use Value: Eliminates need for isolated transformer or charge-pump IC; achieves 90% efficiency at 100 mA with standard 50 µH inductor and MBRS140T3 diode. | Use Scenario: FPGA I/O bank requiring clean, low-noise 3.3 V or 5 V from noisy 12 V intermediate bus in telecom line card. IC Role / Device Role / Timing Role: Local point-of-load regulator with adjustable feedback network and optional noise-reduction capacitor across R2. Use Value: Constant off-time architecture avoids subharmonic oscillation; 1.25 V reference enables precise output setting; low ESR capacitor support ensures <10 mV ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1931IS5#TRMPBF | Fixed 5 V output, 1.25 MHz switching frequency, 600 mA switch, no low-battery detector | Lacks LBIN/LBOUT functionality; higher frequency enables smaller inductors but increases EMI sensitivity | Select when board space is critical and battery monitoring is handled externally |
| TPS62231DRYR | 3 MHz synchronous buck, 300 mA output, 17 µA quiescent current, no inverting capability | Higher efficiency at light loads due to synchronous rectification; no native inverting or low-battery features | Select for ultra-low IQ requirements in always-on IoT sensors where inverting is unnecessary |
Compared with LT1931IS5#TRMPBF and TPS62231DRYR, the LTC1174CS8#TRPBF uniquely integrates low-battery detection, inverting topology support, and micropower shutdown in a single SO-8 package-making it optimal for cost-sensitive, battery-backed instrumentation where feature integration outweighs raw efficiency or footprint minimization.
Availability
LTC1174CS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable instruments, memory backup supplies, 5V-to–5V inverting converters, and low-noise point-of-load applications requiring stable component supply across long production lifecycles.
Supply support for LTC1174CS8#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) acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC1174CS8#TRPBF belongs to Linear's legacy high-efficiency monolithic DC/DC converter family, designed specifically for cost-sensitive, low-to-medium power portable and industrial applications where integration of protection, monitoring, and multiple topologies reduces system complexity.
FAQ
What is the maximum input voltage rating for the LTC1174CS8#TRPBF?
The LTC1174CS8#TRPBF has an absolute maximum input voltage rating of 13.5 V on the VIN pin. This is specified for the standard LTC1174 variant (not the HV version). Exceeding this voltage risks permanent damage. For applications requiring up to 18.5 V input, the LTC1174HVCS8#TRPBF variant must be used instead. Always observe the 0.3 V maximum SW-to-VIN differential to prevent latchup.
How does the LTC1174CS8#TRPBF achieve high efficiency at light loads?
The LTC1174CS8#TRPBF achieves high light-load efficiency through Burst Mode® operation, which disables the switching regulator and places the IC in a 130–180 µA sleep state when output voltage exceeds regulation. During sleep, only the feedback comparator remains active. When output voltage drops due to load, the P-channel switch re-engages. This architecture avoids continuous switching losses and delivers up to 94% peak efficiency while maintaining regulation.
Can the LTC1174CS8#TRPBF be used to generate a negative output voltage?
Yes, the LTC1174CS8#TRPBF can be configured as an inverting converter to generate –5 V from a positive input. In this topology, the GND pin becomes the negative output terminal, and the VOUT pin connects to system ground. The standard LTC1174-5 variant is optimized for this use case, requiring only an inductor, Schottky diode, and input/output capacitors. Input voltage headroom must be maintained per absolute maximum ratings.
What is the function of the IPGM pin on the LTC1174CS8#TRPBF?
The IPGM pin on the LTC1174CS8#TRPBF selects the peak current limit threshold of the internal P-channel MOSFET switch. When pulled to GND (0 V), it configures a 340 mA current limit; when pulled to VIN, it configures a 600 mA limit. This allows designers to optimize inductor size and saturation margin versus maximum output current capability without changing the IC or layout.
Does the LTC1174CS8#TRPBF include short-circuit protection?
Yes, the LTC1174CS8#TRPBF includes robust short-circuit protection via its internal current-limit circuitry. When the switch current reaches the selected threshold (340 mA or 600 mA), the controller extends the off-time to allow inductor current to decay, preventing thermal runaway. This protection operates continuously and does not require external components, making the LTC1174CS8#TRPBF suitable for unattended or safety-critical applications.
LTC1174CS8#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):
- 13.5V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 13V
- Current - Output:
- 340mA, 600mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1174CS8#TRPBF FAQ
1.How can I place an order for LTC1174CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174CS8#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 LTC1174CS8#TRPBF reliable?
The price and inventory of LTC1174CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1174CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174CS8#TRPBF?
LTC1174CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174CS8#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 LTC1174CS8#TRPBF?
For technical support, including LTC1174CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1174CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1174CS8#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 LTC1174CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1174CS8#TRPBF?
All LTC1174CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174CS8#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 LTC1174CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1174CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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