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Analog Devices Inc. LTC1174CS8-3.3#PBF
- Part No.:
- LTC1174CS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174CS8-3.3#PBF.pdf
- Description:
- IC REG BUCK BOOST 3.3V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,404
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Product details
Overview
LTC1174CS8-3.3#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down DC/DC converter with fixed 3.3V output, internal 0.9Ω P-channel MOSFET switch, pin-selectable 340mA/600mA current limit, and integrated low-battery detector. It operates from 4V to 18.5V input and delivers up to 175mA at 3.3V in standard SO-8 package for portable instrumentation and battery-powered equipment.
For engineers reviewing the LTC1174CS8-3.3#PBF datasheet, LTC1174CS8-3.3#PBF pinout, LTC1174CS8-3.3#PBF application, or LTC1174CS8-3.3#PBF equivalent, key selection criteria include its 3.3V fixed output tolerance (±4.7%), 130µA standby current, 94% peak efficiency at 300mA, constant off-time architecture, and compatibility with low-ESR ceramic and tantalum output capacitors.
Technical Context
The LTC1174CS8-3.3#PBF uses a constant off-time current-mode control architecture with internal 1.25V reference and factory-trimmed timing capacitor, enabling frequency variation with input-output voltage differential. Its burst mode operation reduces quiescent current to 130µA under light load while maintaining regulation via hysteretic voltage comparator A1.
It integrates a low-battery detector with 1.25V threshold on LBIN (Pin 3), open-drain LBOUT (Pin 2) capable of sinking 1.2mA, and pin-selectable current limit via IPGM (Pin 7): 340mA at 0V or 600mA at VIN. The internal P-channel switch exhibits 0.75–1.3Ω RDS(ON) at 9V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.30V ±4.7% (3.14V to 3.46V) - tightly regulated fixed output eliminates external feedback resistors |
| Input Voltage Range | 4V to 18.5V - supports 4×NiCd, Li-ion, and wide industrial input rails |
| Peak Efficiency | 94% at 300mA, VIN=9V, VOUT=3.3V - enables minimal thermal rise in compact layouts |
| Standby Current | 130µA typical - extends battery life in always-on portable systems |
| Shutdown Current | 1µA maximum - ensures near-zero drain during storage or sleep states |
| Current Limit | 340mA (IPGM = 0V) or 600mA (IPGM = VIN) - selectable per application power safety margin |
| Switch RDS(ON) | 0.75Ω (min) to 1.3Ω (max) at VIN=9V - defines conduction loss and thermal dissipation |
Pinout & Package
Package: 8-lead plastic SO (SO-8), surface-mount, JEDEC MS-012AC compliant, θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output / feedback node | Fixed 3.3V 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 @ 0.4V) - drives LED or microcontroller interrupt when LBIN falls below 1.25V |
| LBIN (Pin 3) | Low-battery sense input | Inverting input of comparator referenced to 1.25V - connects to external resistor divider from VIN to set trip point (e.g., 5.5V) |
| GND (Pin 4) | Power and signal ground | Common return path for switch, feedback, and detector circuits - must be low-impedance plane |
| SW (Pin 5) | Switch node | Drain of internal P-MOSFET - connects directly to cathode of Schottky catch diode and inductor |
| VIN (Pin 6) | Main input supply | 4V–18.5V input rail - requires local 0.1µF ceramic + bulk capacitor decoupling |
| IPGM (Pin 7) | Current limit select | High-impedance digital input - tie to GND for 340mA limit or VIN for 600mA limit |
| SHUTDOWN (Pin 8) | Enable/disable control | Active-low micropower shutdown - pull ≤0.75V to enter 1µA shutdown; ≥1.2V to operate |
Key Features
| Feature | Design Value |
|---|---|
| Only four external components required | Enables minimal BOM count: inductor, Schottky diode, input capacitor, output capacitor - reduces PCB area and cost |
| Pin-selectable current limit | Supports dual design reuse: 340mA for ultra-low-power sensors, 600mA for higher-current peripherals without layout change |
| Integrated low-battery detector | Eliminates need for external supervisor IC - provides programmable undervoltage warning with hysteresis (7.5–30mV) |
| Burst Mode® operation | Maintains regulation at light loads while reducing IQ to 130µA - critical for multi-day battery life in IoT endpoints |
| Short-circuit protection | Internal current limiting + extended off-time prevents thermal runaway during output faults - no external circuitry needed |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
Use Scenario: Continuous glucose monitor powered by single Li-ion cell with 3.3V MCU, BLE radio, and analog front-end. IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator supplying system rail and enabling low-battery alert before sensor shutdown. Use Value: 94% efficiency at 100mA extends runtime beyond 72 hours; 130µA standby preserves charge during sleep cycles. | Use Scenario: Ruggedized barcode scanner operating from 4×AA alkaline batteries with display backlight and motor driver. IC Role / Device Role / Timing Role: Main 3.3V power source for ARM Cortex-M4 processor and interface logic, with LBIN monitoring declining battery stack. Use Value: Wide 4V–18.5V input range accommodates full battery discharge curve; 600mA current limit supports brief motor surge demands. |
| Memory Backup Supply | Smart Energy Meters |
Use Scenario: SRAM retention circuit during main power failure using supercapacitor or backup battery. IC Role / Device Role / Timing Role: Low-quiescent 3.3V regulator sustaining volatile memory during brownout events. Use Value: 1µA shutdown current minimizes backup source depletion; fixed output ensures stable memory VCC across temperature. | Use Scenario: AMI meter with real-time clock, metrology ASIC, and RF transceiver operating from 3.6V primary battery. IC Role / Device Role / Timing Role: Secondary 3.3V rail for communication subsystem, with LBOUT triggering firmware-initiated data save before shutdown. Use Value: Programmable low-battery trip (e.g., 3.2V) enables graceful shutdown sequence; SO-8 package suits constrained meter PCB space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz synchronous buck, 2.05–6.0V input, 1.8–3.3V adjustable output, 300mA IOUT, 17µA IQ | Requires external feedback resistors; lacks integrated low-battery detector and burst mode | Preferred for high-frequency, low-ripple designs where size is critical and supervision is handled elsewhere |
| MAX17222ELT+T | 1.8–5.5V input, 3.3V fixed output, 500mA, 1.6µA shutdown, 92% peak efficiency, 2.5MHz | No low-battery detection; smaller 6-pin µDFN package; lower max input voltage | Suitable for space-constrained consumer devices where input stays below 5.5V and supervision is external |
Compared with TPS62231DRVR and MAX17222ELT+T, the LTC1174CS8-3.3#PBF uniquely combines fixed 3.3V output, integrated low-battery detection, and micropower burst mode in an industry-standard SO-8 package - making it optimal for legacy-compatible, battery-aware industrial designs requiring minimal external components.
Availability
LTC1174CS8-3.3#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, memory backup supplies, and smart energy meters requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for LTC1174CS8-3.3#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.
The LTC1174 family was designed for high-efficiency, low-component-count DC/DC conversion in battery-powered systems where micropower operation, built-in supervision, and ruggedness across wide input ranges are essential.
FAQ
What is the output voltage tolerance of the LTC1174CS8-3.3#PBF?
The LTC1174CS8-3.3#PBF provides a fixed 3.3V output with guaranteed tolerance of ±4.7% (3.14V to 3.46V) over full temperature and line/load conditions. This specification is confirmed in the Electrical Characteristics table of the official datasheet (LTC1174-3.3/LTC1174HV-3.3 section), and applies across the full operating temperature range of 0°C to 70°C for the 'C' grade version.
Does the LTC1174CS8-3.3#PBF require external feedback resistors?
No, the LTC1174CS8-3.3#PBF does not require external feedback resistors. It integrates an internal precision resistive divider that sets the output to 3.3V, as confirmed in the Functional Diagram and Applications sections of the datasheet. Pin 1 (VOUT/VFB) is the dedicated output terminal - unlike the adjustable LTC1174 variant, no resistor network is needed for regulation.
How does the low-battery detector function in the LTC1174CS8-3.3#PBF?
The LTC1174CS8-3.3#PBF's low-battery detector compares VIN-derived voltage at LBIN (Pin 3) against an internal 1.25V reference. When LBIN falls below 1.25V, LBOUT (Pin 2) sinks up to 1.2mA to signal undervoltage. The trip point is set externally via a resistor divider; for example, 162kΩ and 4.7kΩ resistors yield a 5.5V threshold. This feature is fully functional only when the device is active - LBOUT is indeterminate during shutdown.
What is the maximum output current capability of the LTC1174CS8-3.3#PBF?
The LTC1174CS8-3.3#PBF supports up to 175mA continuous output current under typical conditions (VIN=6V, VOUT=3.3V, L=100µH), as shown in Figure 1174 G04 of the datasheet. Its internal current limit is pin-selectable: 340mA (IPGM = 0V) or 600mA (IPGM = VIN). Actual deliverable current depends on thermal design, input voltage, and inductor selection - the SO-8 package's θJA = 150°C/W limits sustained high-current operation without heatsinking.
Can the LTC1174CS8-3.3#PBF be used in inverting configurations?
Yes, the LTC1174CS8-3.3#PBF can be used in inverting topologies to generate negative outputs such as –3.3V, though it requires reconfiguration of the external circuit - the IC itself remains a step-down controller. Application Note 1174 TA07 demonstrates a –3.3V inverter using LTC1174HV-3.3, confirming the core architecture supports inversion. For the standard LTC1174CS8-3.3#PBF, inversion is feasible but requires careful attention to absolute maximum ratings on SW and VIN pins.
LTC1174CS8-3.3#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):
- 3.3V
- 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
LTC1174CS8-3.3#PBF FAQ
1.How can I place an order for LTC1174CS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174CS8-3.3#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 LTC1174CS8-3.3#PBF reliable?
The price and inventory of LTC1174CS8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174CS8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174CS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174CS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174CS8-3.3#PBF?
LTC1174CS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174CS8-3.3#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 LTC1174CS8-3.3#PBF?
For technical support, including LTC1174CS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174CS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1174CS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174CS8-3.3#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 LTC1174CS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174CS8-3.3#PBF?
All LTC1174CS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174CS8-3.3#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 LTC1174CS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1174CS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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