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Analog Devices Inc. LTC1174CS8#PBF
- Part No.:
- LTC1174CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174CS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:205
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Product details
Overview
LTC1174CS8#PBF 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), and supports battery-powered portable instruments requiring low-noise, micropower operation with low-battery detection.
For engineers reviewing the LTC1174CS8#PBF datasheet, LTC1174CS8#PBF pinout, LTC1174CS8#PBF application, or LTC1174CS8#PBF equivalent, key selection criteria include its constant off-time architecture, 94% peak efficiency at 300 mA, integrated low-battery comparator (1.25 V threshold), active-low shutdown (1 µA), and minimal external component count (only four required).
Technical Context
The LTC1174CS8#PBF employs a constant off-time (COT) control architecture with wafer-sort-trimmed 4 µs off-time, resulting in VIN-dependent switching frequency (e.g., ~111 kHz at VIN = 9 V, VOUT = 5 V). Its internal 0.9 Ω P-channel MOSFET switch and current-sense resistor enable peak-current mode regulation without external sense components.
It integrates a 1.25 V precision reference, hysteresis-based low-battery detector (VLBTRIP = 1.25–1.4 V), and Burst Mode® operation for ultra-low quiescent current (130 µA active, 1 µA shutdown). Output voltage is fixed at 5.00 V ±2.5% over load, line, and temperature, with feedback via internal resistive divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00 V ±2.5% - Regulated fixed output; no external feedback resistors needed. |
| Input Voltage Range | 4 V to 18.5 V - Supports wide battery input (e.g., 4×NiCd, Li-ion with headroom). |
| Peak Efficiency | 94% at 300 mA - Enables high power density in space-constrained portable designs. |
| Quiescent Current | 130 µA (active), 1 µA (shutdown) - Extends battery life in sleep-mode applications. |
| Current Limit | 340 mA (IPGM = 0 V) or 600 mA (IPGM = VIN) - Pin-selectable for optimal efficiency vs. output current trade-off. |
| Switch RON | 0.75–1.30 Ω (at VIN = 9 V) - Low conduction loss enables high efficiency without heatsinking. |
| Low-Battery Threshold | 1.25–1.4 V on LBIN pin - Configurable external divider enables system-level battery monitoring. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), surface-mount, RoHS-compliant (Pb-free #PBF marking).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output / feedback node | Fixed 5 V output terminal; internally connected to resistive divider; no external resistor required. |
| LBOUT (Pin 2) | Low-battery indicator open-drain output | Sinks up to 1.5 mA when LBIN < 1.25 V; requires external pull-up for LED or MCU interrupt signaling. |
| LBIN (Pin 3) | Low-battery comparator inverting input | Accepts divided input voltage; compares against 1.25 V internal reference to trigger LBOUT. |
| GND (Pin 4) | Power and signal ground reference | Common return path for switch, feedback, and comparator circuits; must be low-impedance. |
| SW (Pin 5) | Switch node (drain of internal P-MOSFET) | Connects directly to cathode of external Schottky catch diode and inductor; high dV/dt node. |
| VIN (Pin 6) | Main input supply connection | Accepts 4–18.5 V; requires local 0.1 µF ceramic + bulk capacitor decoupling per layout guidelines. |
| IPGM (Pin 7) | Current limit programming input | Logic-level input: tie to GND for 340 mA limit, or to VIN for 600 mA limit; high-impedance. |
| SHUTDOWN (Pin 8) | Active-low enable/disable control | Pull to GND to enter 1 µA shutdown; float or tie to VIN for normal operation; 0.75 V max logic-low threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Only four external components required | Reduces BOM cost, PCB area, and design validation effort-no external current sense or compensation needed. |
| Burst Mode® operation | Automatically engages under light load to maintain 130 µA quiescent current while regulating output voltage. |
| Internal 0.9 Ω P-channel MOSFET switch | Eliminates need for external high-side switch; simplifies thermal design and improves reliability. |
| Pin-selectable current limit (340/600 mA) | Enables optimization for either low-noise/low-ripple (lower limit) or higher output current capability. |
| Integrated low-battery detector with hysteresis | Provides system-level battery monitoring using only two external resistors; 7.5–30 mV hysteresis prevents chatter. |
Applications
| Portable Medical Instruments | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld blood glucose meters operating from two AA alkaline cells (2.4–3.2 V) with boost + LDO or single-cell Li-ion (3.0–4.2 V) with buck conversion. IC Role / Device Role / Timing Role: Primary 5 V step-down regulator powering microcontroller, display, and sensor interface. Use Value: 94% efficiency extends battery life; 130 µA standby preserves charge during measurement intervals; low-battery flag alerts user before critical shutdown. |
Use Scenario: Remote environmental sensors deployed for weeks on coin-cell or AA batteries, transmitting data intermittently via BLE or LoRa. IC Role / Device Role / Timing Role: Main 5 V supply for MCU and RF transceiver during active transmission bursts. Use Value: Micropower shutdown (1 µA) minimizes leakage between readings; pin-selectable current limit matches peak transmit load (e.g., 600 mA for LTE-M burst). |
| Industrial Handheld Scanners | Memory Backup Power Supplies |
Use Scenario: Rugged barcode scanners powered by removable Li-ion packs (7.4–8.4 V), requiring clean 5 V rail for CMOS image sensor and decode engine. IC Role / Device Role / Timing Role: High-efficiency buck converter with low EMI due to constant off-time architecture. Use Value: 94% efficiency reduces thermal stress in sealed enclosures; 4 µs trimmed off-time ensures stable frequency across temperature. |
Use Scenario: SRAM or real-time clock backup in industrial PLCs where main 5 V rail may fail unexpectedly. IC Role / Device Role / Timing Role: Inverting converter generating –5 V from main 5 V rail to bias backup supercapacitor charging circuitry. Use Value: Fixed-output LTC1174-5 variant enables simple –5 V generation with minimal parts; short-circuit protection safeguards backup path during fault events. |
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 | Higher 1.25 MHz fixed-frequency PWM; lower 500 nA shutdown current; requires external compensation; no integrated low-battery detector. | Preferred for ultra-small footprint (SOT-23-5); unsuitable where battery monitoring or Burst Mode efficiency at light load is required. | Select LT1931IS5#TRMPBF only if board space is constrained and fixed-frequency EMI control is prioritized over micropower operation. |
| TPS62231DRYR | 3-MHz synchronous buck; 22 µA quiescent current; 95% peak efficiency; no low-battery function; requires external feedback resistors. | Optimized for high-frequency, low-ripple applications (e.g., FPGA core rails); lacks integrated battery monitoring and pin-selectable current limit. | Choose TPS62231DRYR when synchronous rectification and tighter output tolerance (<±1%) are mandatory, and external resistor networks are acceptable. |
Compared with LT1931IS5#TRMPBF and TPS62231DRYR, the LTC1174CS8#PBF uniquely combines micropower Burst Mode operation, integrated low-battery detection, pin-selectable current limiting, and fixed 5 V output in an SO-8 package-making it optimal for cost-sensitive, battery-life-critical portable instrumentation where feature integration outweighs ultra-high switching frequency.
Availability
LTC1174CS8#PBF is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered data loggers, industrial handheld scanners, and memory backup power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LTC1174CS8#PBF 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, datasheets, and application notes for the LTC portfolio. Linear's legacy focus on precision analog and power management remains central to ADI's high-reliability IC strategy.
The LTC1174CS8#PBF belongs to Linear's legacy high-efficiency DC/DC converter family, designed specifically for battery-powered portable equipment requiring micropower operation, integrated protection, and minimal external components.
FAQ
What is the maximum input voltage rating for the LTC1174CS8#PBF?
The LTC1174CS8#PBF has an absolute maximum input voltage rating of 18.5 V on the VIN pin. This applies to the HV version (LTC1174HVCS8#PBF); however, the standard LTC1174CS8#PBF is rated for up to 13.5 V input. Exceeding these limits risks permanent damage. Always refer to the Absolute Maximum Ratings table in the official datasheet for safe operating conditions of the LTC1174CS8#PBF.
Does the LTC1174CS8#PBF require external feedback resistors to set the 5 V output?
No, the LTC1174CS8#PBF does not require external feedback resistors. It is the fixed 5 V output variant (LTC1174-5) with an internal resistive divider connected to the VOUT (Pin 1) terminal. The output is factory-trimmed to 5.00 V ±2.5% across temperature and load, eliminating the need for external resistor networks and simplifying layout.
How does the low-battery detection function work on the LTC1174CS8#PBF?
The LTC1174CS8#PBF uses its LBIN (Pin 3) and LBOUT (Pin 2) pins to implement low-battery detection. An external resistor divider scales the input voltage and applies it to LBIN, which is compared to an internal 1.25 V reference. When the scaled voltage drops below 1.25 V, LBOUT sinks current (up to 1.5 mA) to signal low battery. The LTC1174CS8#PBF includes 7.5–30 mV hysteresis to prevent oscillation near the trip point.
Can the LTC1174CS8#PBF be used in inverting (negative output) configurations?
Yes, the LTC1174CS8#PBF can be configured as an inverting converter to generate –5 V from a positive input. While the LTC1174CS8#PBF itself is the 5 V fixed-output version, its architecture supports inverting topologies-as confirmed in the datasheet's Figure 5 ("Positive-to-Negative 5V Converter"). External component selection (inductor, diode, capacitors) must follow inverting design rules, and the maximum input voltage must respect the absolute maximum rating relative to the negative output rail.
What is the purpose of the IPGM pin on the LTC1174CS8#PBF?
The IPGM (Pin 7) on the LTC1174CS8#PBF selects the peak inductor current limit: tying IPGM to GND sets the limit to 340 mA, while tying it to VIN sets it to 600 mA. This pin enables designers to optimize efficiency versus output current capability without changing the IC. The LTC1174CS8#PBF's current limit is internally sensed and does not require external components-making IPGM a simple, effective configuration option.
LTC1174CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1174CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174CS8#PBF 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#PBF reliable?
The price and inventory of LTC1174CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174CS8#PBF?
LTC1174CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174CS8#PBF 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#PBF?
For technical support, including LTC1174CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174CS8#PBF requirements.
6.How does Aetrix verify that LTC1174CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174CS8#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174CS8#PBF?
All LTC1174CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174CS8#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1174CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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