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Analog Devices Inc. LTC1174CN8-5#PBF
- Part No.:
- LTC1174CN8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1174CN8-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,043
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Product details
Overview
LTC1174CN8-5#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 LTC1174CN8-5#PBF datasheet, LTC1174CN8-5#PBF pinout, LTC1174CN8-5#PBF application, or LTC1174CN8-5#PBF equivalent, key selection criteria include its 5V fixed output, PDIP-8 package with thermal resistance θJA = 110°C/W, 130µA standby current, and compatibility with standard Schottky catch diodes (e.g., 1N5818) in minimal-component buck designs.
Technical Context
The LTC1174CN8-5#PBF employs a constant off-time current-mode architecture with internal 1.25V reference and fixed resistive feedback divider for 5V regulation. Its switching frequency varies with input–output voltage differential (e.g., ~111kHz at VIN=9V, VOUT=5V), and it automatically transitions between continuous conduction mode and Burst Mode® to maintain high light-load efficiency.
It integrates low-battery detection via external resistor divider on LBIN (Pin 3), drives LBOUT (Pin 2) as open-drain output, and uses IPGM (Pin 7) to select peak current limit (340mA at 0V, 600mA at VIN). The internal P-channel switch enables low-dropout operation and short-circuit protection without external sensing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±2.5% (4.75V–5.25V); eliminates need for external feedback resistors in 5V applications. |
| Input Voltage Range | 4V to 18.5V; supports wide battery chemistries including 4×NiCd (4.8V) up to 12V lead-acid or multi-cell Li-ion stacks. |
| Peak Efficiency | Up to 94% at 300mA load (VIN=6V–9V, L=100µH); reduces thermal stress and extends battery life in portable systems. |
| Quiescent Current | 130µA in active sleep mode; enables >1000-hour runtime on coin cells when paired with low-power loads. |
| Shutdown Current | 1µA typical; critical for always-on monitoring circuits requiring ultra-low standby power. |
| Current Limit | PIN-selectable: 340mA (IPGM = 0V) or 600mA (IPGM = VIN); allows optimization of inductor size and thermal margin per application. |
| Switch RDS(ON) | 0.75Ω to 1.30Ω (typ. 0.9Ω at VIN=9V); enables high efficiency without external MOSFET, reducing BOM count. |
Pinout & Package
Package: 8-lead PDIP (Plastic Dual In-line Package), 0.300" width, JEDEC MS-001. Thermal resistance θJA = 110°C/W. Suitable for through-hole prototyping and industrial PCBs requiring mechanical robustness.
| 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 output sinking up to 1.2mA; pulls low when LBIN voltage drops below 1.25V threshold. |
| LBIN (Pin 3) | Low-battery comparator input | Inverting input of comparator referenced to 1.25V; accepts external resistor divider to set trip point (e.g., 5.5V). |
| GND (Pin 4) | Power and signal ground | Common return path for switch current, feedback, and shutdown logic; must be low-impedance connection. |
| SW (Pin 5) | Switch node | Drain of internal P-channel MOSFET; connects directly to cathode of external Schottky catch diode and inductor. |
| VIN (Pin 6) | Main input supply | Accepts 4V–18.5V; requires local 0.1µF ceramic + bulk electrolytic decoupling to handle high-frequency switching transients. |
| IPGM (Pin 7) | Current limit programming | High-impedance input; tie to GND for 340mA limit or VIN for 600mA limit-enables single-part flexibility across load ranges. |
| SHUTDOWN (Pin 8) | Enable/disable control | Active-low micropower shutdown; <0.75V disables device (1µA IQ), >1.2V enables operation (130µA IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >85% efficiency down to 1mA load by disabling switching and entering ultra-low-current sleep state. |
| Internal 0.9Ω P-channel switch | Eliminates external high-side FET and gate driver; reduces layout complexity and component count to only four externals. |
| Pin-selectable current limit | Supports two discrete inductor/thermal designs using same footprint-340mA for compact size, 600mA for higher output capability. |
| Low-battery detector with hysteresis | 1.25V reference + 7.5–30mV hysteresis prevents chatter near trip point; LBOUT provides direct LED or MCU interrupt interface. |
| Short-circuit protection | Automatic foldback via increased off-time during overload; sustains 600mA limit without external current-sense resistor or IC damage. |
Applications
| Portable Instrument Power | Memory Backup Supply |
|---|---|
|
Use Scenario: Handheld multimeter powered by 4×AA alkaline cells (6V–9V) requiring stable 5V for microcontroller and LCD. IC Role / Device Role / Timing Role: Primary step-down regulator generating main 5V system rail with automatic low-battery warning. Use Value: 94% efficiency extends battery life beyond 200 hours; 130µA sleep current preserves charge during idle periods. |
Use Scenario: SRAM backup in industrial PLC retaining configuration during AC power loss using supercapacitor or coin cell. IC Role / Device Role / Timing Role: Low-quiescent buck converter maintaining 5V rail from 3.6V lithium primary cell or 5.5V supercap. Use Value: 1µA shutdown current prevents backup source depletion; fixed 5V output ensures SRAM data retention compliance. |
| 9V-to-5V Pre-regulator | Distributed 5V Point-of-Load |
|
Use Scenario: 9V wall adapter powering embedded controller board where linear regulator would overheat. IC Role / Device Role / Timing Role: Efficient pre-regulator stepping 9V down to 5V before LDO clean-up for noise-sensitive analog sections. Use Value: Reduces heat dissipation by >80% vs. linear solution; enables use of smaller heatsinks or fanless enclosure design. |
Use Scenario: Distributed power architecture in test equipment requiring localized 5V rails near FPGA I/O banks. IC Role / Device Role / Timing Role: Compact, self-contained point-of-load converter minimizing trace inductance and EMI. Use Value: PDIP-8 package allows easy placement near load; 4-component design simplifies layout and improves transient response. |
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 |
|---|---|---|---|
| LTC1174CS8-5#PBF | SO-8 package (θJA = 150°C/W), surface-mount; identical electrical specs and pinout except for package. | Better suited for automated assembly and space-constrained PCBs; requires reflow-compatible layout. | Select when volume production, smaller footprint, or thermal management via PCB copper is prioritized over through-hole serviceability. |
| LTC1148CS8#PBF | Higher efficiency (>95%), 1A output, synchronous rectification, wider 2.7V–36V input range; different pinout and external component requirements. | Targets higher-current or ultra-wide-input applications where LTC1174CN8-5#PBF reaches thermal limits. | Choose when >500mA load, >95% efficiency, or input below 4V is required-requires full schematic and layout redesign. |
Compared with LTC1174CS8-5#PBF, the LTC1174CN8-5#PBF offers superior thermal performance in free-air environments due to lower θJA, while LTC1148CS8#PBF enables higher power density and broader input flexibility at the cost of increased design complexity.
Availability
LTC1174CN8-5#PBF is available at Aetrix Electronics and suitable for portable instruments, memory backup supplies, and distributed 5V point-of-load applications requiring stable component supply, long-lifecycle support, and through-hole manufacturability.
Supply support for LTC1174CN8-5#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LTC series.
The LTC1174 family was designed specifically for low-cost, high-efficiency, minimal-component DC/DC conversion in battery-powered and space-constrained systems-emphasizing ease of use, reliability, and broad input voltage tolerance.
FAQ
What is the maximum output current capability of the LTC1174CN8-5#PBF?
The LTC1174CN8-5#PBF supports two pin-selectable current limits: 340mA when IPGM (Pin 7) is grounded, and 600mA when IPGM is tied to VIN. Actual sustained output depends on thermal conditions-using the PDIP-8 package at 25°C ambient, 340mA is reliably achievable without forced airflow; 600mA requires careful thermal design due to θJA = 110°C/W.
Does the LTC1174CN8-5#PBF require external feedback resistors to regulate 5V?
No. The LTC1174CN8-5#PBF is the fixed 5V version of the LTC1174 family and contains an internal precision resistive divider connected to the VOUT (Pin 1) terminal. Unlike the adjustable LTC1174 variant, no external resistors are needed-simplifying design and improving output accuracy and stability.
How does the low-battery detection function work on the LTC1174CN8-5#PBF?
The LTC1174CN8-5#PBF uses LBIN (Pin 3) as the inverting input to a comparator referenced to an internal 1.25V bandgap. An external resistor divider from VIN to GND sets the trip voltage (e.g., 5.5V with 162k/4.7k). When LBIN falls below 1.25V, LBOUT (Pin 2) pulls low to indicate low battery-providing a direct interface to LEDs or microcontroller GPIOs.
Can the LTC1174CN8-5#PBF be used in inverting (positive-to-negative) configurations?
Yes-the LTC1174CN8-5#PBF can generate –5V from a positive input by reconfiguring the circuit per Figure 5 in the datasheet. In this topology, the GND pin becomes the negative output, and VOUT (Pin 1) connects to system ground. Input voltage headroom must be maintained: for –5V output, max VIN is 12V to stay within absolute maximum ratings.
What is the purpose of the IPGM pin on the LTC1174CN8-5#PBF?
The IPGM (Pin 7) on the LTC1174CN8-5#PBF selects the peak inductor current limit: grounding IPGM sets 340mA for lower thermal stress and smaller magnetics; connecting IPGM to VIN selects 600mA for higher output capability. This dual-range feature allows one part number to serve multiple load profiles without changing the IC or layout.
LTC1174CN8-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1174CN8-5#PBF FAQ
1.How can I place an order for LTC1174CN8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174CN8-5#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 LTC1174CN8-5#PBF reliable?
The price and inventory of LTC1174CN8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174CN8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174CN8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174CN8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174CN8-5#PBF?
LTC1174CN8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174CN8-5#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 LTC1174CN8-5#PBF?
For technical support, including LTC1174CN8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174CN8-5#PBF requirements.
6.How does Aetrix verify that LTC1174CN8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174CN8-5#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 LTC1174CN8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174CN8-5#PBF?
All LTC1174CN8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174CN8-5#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 LTC1174CN8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1174CN8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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