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Analog Devices Inc. LTC1174CS8-5#PBF
- Part No.:
- LTC1174CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174CS8-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:396
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Product details
Overview
LTC1174CS8-5#PBF from Analog Devices (formerly Linear Technology) is a fixed-output, high-efficiency step-down DC/DC converter IC optimized for 5V output from 4V–18.5V input. It integrates a 0.9Ω P-channel MOSFET switch, supports pin-selectable 340mA/600mA current limit, delivers up to 94% efficiency at 300mA load, and features micropower shutdown (1µA), low-battery detection, and Burst Mode® operation for portable 5V rail generation.
For engineers reviewing the LTC1174CS8-5#PBF datasheet, LTC1174CS8-5#PBF pinout, LTC1174CS8-5#PBF application, or LTC1174CS8-5#PBF equivalent, key selection considerations include its fixed 5V output, SO-8 package thermal resistance (θJA = 150°C/W), 130µA standby current, internal 1.25V feedback reference, and compatibility with standard Schottky catch diodes like MBRS140T3 in minimal-component buck designs.
Technical Context
The LTC1174CS8-5#PBF employs a constant off-time current-mode control architecture with wafer-trimmed 4µs switch off-time, enabling frequency variation (≈42–111kHz) based on input-output voltage differential. Its internal 1.25V reference and factory-set resistive divider fix VOUT at 5.00V ±2.5%, eliminating external feedback components.
Operation includes automatic transition between continuous conduction mode and Burst Mode® under light loads, reducing quiescent current to 130µA. The low-battery detector compares VIN-derived voltage at LBIN (Pin 3) against 1.25V, sinking up to 1.2mA at LBOUT (Pin 2) when trip threshold (1.25–1.4V) is crossed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±2.5% - eliminates need for external feedback resistors in 5V applications. |
| Input Voltage Range | 4V to 18.5V - supports wide battery and industrial supply rails including 9V alkaline, 4×NiCd, and 12V systems. |
| Peak Efficiency | 94% at 300mA, VIN=9V - enables compact thermal design with minimal heatsinking in space-constrained PCBs. |
| Standby Current | 130µA - extends battery life in always-on portable instruments and memory backup systems. |
| Shutdown Current | 1µA - ensures negligible drain during storage or system sleep states. |
| Current Limit | PIN-selectable 340mA (IPGM=0V) or 600mA (IPGM=VIN) - allows optimization of inductor size and transient response per application. |
| Switch RDS(ON) | 0.75Ω (typ) at VIN=9V - reduces conduction loss and improves full-load efficiency vs. discrete switch solutions. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), surface-mount, θJA = 150°C/W. RoHS-compliant, lead-free (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output / feedback node | Fixed 5V output terminal; internally connected to precision resistive divider - no external resistor required. |
| LBOUT (Pin 2) | Low-battery indicator output | Open-drain N-channel sink (1.2mA max) - drives LED or microcontroller interrupt when input drops below ~5.5V (with external divider). |
| LBIN (Pin 3) | Low-battery comparator input | Inverting input of 1.25V reference comparator - accepts scaled VIN via external resistor divider for customizable trip point. |
| GND (Pin 4) | Power and signal ground | Common return for switch, feedback, and low-battery circuitry - requires low-impedance connection to minimize noise and dropout. |
| SW (Pin 5) | Switch node | Drain of internal P-MOSFET - connects directly to cathode of Schottky catch diode and inductor; high dV/dt node requiring tight layout. |
| VIN (Pin 6) | Main input supply | Accepts 4–18.5V input - must be decoupled with ≥10µF low-ESR capacitor and 0.1µF ceramic close to pin. |
| IPGM (Pin 7) | Current limit select | High-impedance digital input - tie to VIN for 600mA limit or GND for 340mA limit; floating not allowed. |
| SHUTDOWN (Pin 8) | Enable/disable control | Active-low micropower enable - pull ≤0.75V to enter 1µA shutdown; requires pull-up to VIN for normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Only four external components required | Enables complete 5V buck converter with single inductor, Schottky diode, input cap, and output cap - reduces BOM cost and board area by >40% vs. controller+MOSFET solutions. |
| Burst Mode® operation | Maintains high light-load efficiency (≥85% at 10mA) by disabling switching and entering sleep mode - critical for battery runtime in intermittent-use devices. |
| Internal 0.9Ω power switch | Eliminates gate drive complexity and external MOSFET losses - simplifies design while delivering 5V/350mA from 9V input without thermal derating. |
| Pin-selectable current limit | Supports dual inductor sizing strategies: 340mA for low-ripple/low-noise or 600mA for higher output current - avoids overdesigning magnetics. |
| Low-battery detector with hysteresis | Provides 7.5–30mV hysteresis to prevent chatter during brownout - enables reliable system-level power management without additional comparators. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered glucose meter with LCD display and Bluetooth LE radio operating from two AA cells (2.4–3.2V nominal). IC Role / Device Role / Timing Role: Step-down converter generating stable 5V rail for MCU, sensor interface, and RF transceiver from boosted input. Use Value: 94% peak efficiency and 130µA standby current extend battery life to >12 months; Burst Mode® maintains >88% efficiency at 50µA sleep current. | Use Scenario: Remote environmental monitor deployed in oil-field equipment, powered by 12V lead-acid battery with wide temperature range (-40°C to +85°C). IC Role / Device Role / Timing Role: Primary 5V regulator for ARM Cortex-M4 MCU, SD card interface, and analog front-end ADC. Use Value: Wide 4–18.5V input range accommodates battery voltage sag and load dump transients; 150°C/W θJA enables operation without heatsink in sealed enclosures. |
| Memory Backup Supply | Handheld Test Equipment |
Use Scenario: SRAM retention circuit in programmable logic controller maintaining configuration during AC power failure. IC Role / Device Role / Timing Role: Standby 5V source activated only when main supply fails, drawing <1µA in shutdown. Use Value: 1µA shutdown current prevents rapid battery depletion; low-dropout operation sustains output down to 4V input - maximizes usable backup battery capacity. | Use Scenario: Portable oscilloscope with 5V FPGA, 3.3V ADC, and 12V analog front-end, powered by rechargeable Li-ion pack (3.0–4.2V/cell). IC Role / Device Role / Timing Role: First-stage 5V buck converter feeding secondary LDOs for clean digital and analog rails. Use Value: Fixed 5V output eliminates feedback tuning; 0.75Ω RDS(ON) minimizes heat generation during extended field use - no thermal throttling observed at 350mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675-5.0/NOPB | 5V fixed output, 400mA current limit, 100µA quiescent current, requires external diode and compensation components. | Lacks integrated low-battery detector and Burst Mode® - less suitable for ultra-low-power portable use. | Choose for cost-sensitive industrial applications where 100µA IQ suffices and external component count is acceptable. |
| TPS62231DRVR | 5V fixed output, 400mA limit, 17µA quiescent current, synchronous rectification, 2.25MHz switching frequency. | Higher frequency enables smaller inductors but increases EMI sensitivity - requires careful layout for noise-sensitive analog circuits. | Choose for space-constrained designs needing sub-1mm height inductors, accepting trade-off in EMI filtering complexity. |
Compared with LM2675-5.0/NOPB and TPS62231DRVR, the LTC1174CS8-5#PBF offers superior light-load efficiency via Burst Mode®, integrated low-battery monitoring, and lower component count - making it optimal for battery longevity and system-level power management in portable instrumentation.
Availability
LTC1174CS8-5#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, memory backup supplies, and handheld test equipment requiring stable component supply across extended product lifecycles.
Supply support for LTC1174CS8-5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1174 family was designed specifically for high-efficiency, low-component-count DC/DC conversion in battery-powered and space-constrained applications - emphasizing micropower operation, integrated protection, and ease of implementation.
FAQ
What is the maximum output current capability of the LTC1174CS8-5#PBF?
The LTC1174CS8-5#PBF supports a maximum continuous output current of 350mA under typical conditions (VIN=9V, TA=25°C). Its internal current limit is pin-selectable: 340mA when IPGM is grounded, or 600mA when IPGM is tied to VIN. Actual deliverable current depends on thermal conditions, input voltage, and inductor selection - derating is required above 70°C ambient due to its 150°C/W junction-to-ambient thermal resistance.
Does the LTC1174CS8-5#PBF require external feedback resistors to set the 5V output?
No, the LTC1174CS8-5#PBF does not require external feedback resistors. It integrates a precision internal resistive divider that fixes the regulated output voltage at 5.00V ±2.5%. This distinguishes it from the adjustable LTC1174 variant (which uses Pin 1 as VFB) and eliminates two components, saving board space and improving accuracy over temperature.
How does the low-battery detection function work on the LTC1174CS8-5#PBF?
The LTC1174CS8-5#PBF implements low-battery detection using an internal 1.25V reference comparator. An external resistor divider scales VIN and applies it to LBIN (Pin 3); when this voltage falls below the 1.25V threshold (±15mV hysteresis), LBOUT (Pin 2) sinks up to 1.2mA to signal low battery. The trip point is fully configurable - for example, a 162kΩ/4.7kΩ divider sets detection at 5.5V input.
Can the LTC1174CS8-5#PBF be used in inverting (negative output) configurations?
Yes, the LTC1174CS8-5#PBF can be configured as a positive-to-negative inverter. In this topology, the GND pin becomes the negative output (–5V), and the original VOUT pin serves as the new ground reference. The datasheet confirms suitability for –5V generation with minimal components, though input voltage headroom must be maintained: maximum VIN is reduced by the absolute value of VOUT (e.g., 12V max for –5V output).
What is the purpose of the IPGM pin on the LTC1174CS8-5#PBF?
The IPGM (Current Limit Select) pin on the LTC1174CS8-5#PBF determines the peak inductor current limit: connecting IPGM to GND sets the limit to 340mA, while connecting it to VIN raises it to 600mA. This allows designers to optimize inductor size and ripple current for specific load requirements - lower current limit enables smaller inductors and reduced EMI, while higher limit supports greater output current capability.
LTC1174CS8-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 13.5V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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
LTC1174CS8-5#PBF FAQ
1.How can I place an order for LTC1174CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174CS8-5#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 LTC1174CS8-5#PBF reliable?
The price and inventory of LTC1174CS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174CS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174CS8-5#PBF?
LTC1174CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174CS8-5#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 LTC1174CS8-5#PBF?
For technical support, including LTC1174CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174CS8-5#PBF requirements.
6.How does Aetrix verify that LTC1174CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174CS8-5#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 LTC1174CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174CS8-5#PBF?
All LTC1174CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174CS8-5#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 LTC1174CS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1174CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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