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Analog Devices Inc. LTC1174CN8-3.3#PBF
- Part No.:
- LTC1174CN8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1174CN8-3.3#PBF.pdf
- Description:
- IC REG BUCK BOOST 3.3V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,866
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Product details
Overview
LTC1174CN8-3.3#PBF from Analog Devices (formerly Linear Technology) is a monolithic, high-efficiency step-down DC/DC converter with fixed 3.3V output, internal 0.9Ω P-channel MOSFET switch, pin-selectable current limit (340mA/600mA), and integrated low-battery detector. It operates from 4V to 18.5V input, delivers up to 175mA output, and achieves up to 94% efficiency in portable instrumentation power supplies.
For engineers reviewing the LTC1174CN8-3.3#PBF datasheet, LTC1174CN8-3.3#PBF pinout, LTC1174CN8-3.3#PBF application, or LTC1174CN8-3.3#PBF equivalent, key selection criteria include its fixed 3.3V output accuracy (±3.5%), 130µA standby current, 4µs switch off-time, N8 PDIP-8 package compatibility, and suitability for battery-powered systems requiring low-noise, micropower regulation.
Technical Context
The LTC1174CN8-3.3#PBF employs a constant off-time current-mode control architecture with an internal 1.25V reference and hysteresis-based Burst Mode® operation for light-load efficiency optimization. Its switching frequency varies with input-output voltage differential, typically ranging from ~42kHz at VIN=6V to ~111kHz at VIN=9V with VOUT=5V.
It integrates a low-battery comparator (trip point 1.25V on LBIN, hysteresis 7.5–30mV), active-low micropower shutdown (<1µA), and pin-selectable peak current limit via IPGM (0V → 340mA, VIN → 600mA). The device supports both step-down and inverting topologies using external passive components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.5% (3.14V to 3.46V) - tightly regulated without external feedback resistors. |
| Input Voltage Range | 4V to 18.5V - supports single Li-ion, multi-cell alkaline/NiCd, and industrial 5–15V rails. |
| Max Output Current | 175mA continuous (at VOUT=3.3V, VIN=5V, IPGM=0V) - limited by thermal design in N8 package. |
| Efficiency | Up to 94% - achieved at mid-load with 100µH inductor and Schottky catch diode. |
| Quiescent Current | 130µA in sleep mode - enables >1-year battery life in low-duty-cycle sensor nodes. |
| Shutdown Current | 1µA - ensures negligible drain during system sleep or storage. |
| Switch RDS(ON) | 0.75Ω (typ) at VIN=9V - reduces conduction loss and improves thermal margin. |
Pinout & Package
N8 package: 8-lead plastic dual in-line package (PDIP), 0.3" wide, through-hole mount, RoHS-compliant #PBF finish.
| 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 open-drain output | Sinks up to 1.2mA when LBIN falls below 1.25V; requires external pull-up for LED or MCU interrupt signaling. |
| LBIN (Pin 3) | Low-battery comparator inverting input | Accepts scaled input voltage via external resistor divider; trip threshold is 1.25V with 7.5–30mV hysteresis. |
| GND (Pin 4) | Power and signal ground reference | Common return path for switch, feedback, and comparator circuits - must be low-impedance connection. |
| SW (Pin 5) | Switch node / P-MOSFET drain | 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; requires local 0.1µF ceramic + bulk electrolytic decoupling per layout guidelines. |
| IPGM (Pin 7) | Current limit programming input | Logic-level select: tie to GND for 340mA limit, tie to VIN for 600mA limit - determines inductor sizing and thermal design. |
| SHUTDOWN (Pin 8) | Active-low enable control | Pull ≤0.75V to disable regulator and reduce current to 1µA; float or tie to VIN for normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity in space-constrained designs. |
| Burst Mode® operation | Maintains >85% efficiency down to 1mA load by cycling into micropower sleep, critical for intermittent-sensing applications. |
| Integrated low-battery detector | Provides system-level power monitoring with user-configurable trip point via external divider - no additional IC needed. |
| Only four external components | Requires only inductor, Schottky diode, input capacitor, and output capacitor - simplifies qualification and reduces failure points. |
| Short-circuit protection | Auto-limits peak switch current to 340mA or 600mA and extends off-time to prevent thermal runaway under fault conditions. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG front-end with 3.3V ADC, microcontroller, and BLE radio operating intermittently over multi-week deployments. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator with micropower sleep and low-battery warning for predictive maintenance alerts. Use Value: 130µA quiescent current extends AA battery life beyond 18 months; fixed 3.3V output ensures ADC reference stability without calibration drift. |
Use Scenario: Remote environmental monitor powered by 4×AA cells, logging temperature/humidity every 5 minutes and transmitting via LoRaWAN. IC Role / Device Role / Timing Role: Main step-down regulator supplying 3.3V to MCU, sensors, and transceiver; LBOUT triggers firmware-initiated shutdown before brownout. Use Value: Pin-selectable 340mA current limit matches typical peak transmit load; 94% efficiency minimizes heat rise in sealed enclosure. |
| Handheld Test Equipment | Memory Backup Supply |
Use Scenario: Pocket-sized multimeter with LCD display, analog front-end, and USB-C charging, requiring clean 3.3V for digital logic and precision references. IC Role / Device Role / Timing Role: Low-noise 3.3V supply with Burst Mode® to suppress switching artifacts near sensitive analog sections. Use Value: Constant off-time architecture avoids beat frequencies with other system clocks; 0.1µF VIN decoupling suppresses high-frequency noise. |
Use Scenario: SRAM backup circuit in industrial PLC retaining configuration during main power loss, powered by coin cell or supercapacitor. IC Role / Device Role / Timing Role: Ultra-low-quiescent step-down converter enabling long-term memory retention from marginal input voltages (down to 4V). Use Value: 1µA shutdown current preserves backup energy; low-dropout behavior maintains regulation as input decays from 4.2V to 4.0V. |
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 3.3V, 1.2MHz switching, 600mA output, SOT-23-5 package, higher IQ (1.1mA active) | Higher frequency enables smaller inductors/caps but increases EMI sensitivity; unsuitable for ultra-low-IQ designs | Select when board space is constrained and 1.1mA quiescent current is acceptable; not drop-in due to different pinout and package. |
| TPS62231DRYR | Fixed 3.3V, 3MHz sync buck, 400mA, 6-pin WSON, 17µA IQ, requires external compensation | Higher efficiency at light loads due to DCS-Control™, but lacks integrated low-battery detector and requires more external components | Choose for high-density layouts needing <20µA sleep current and fast transient response; add external comparator if LB detection is required. |
Compared with LTC1174CN8-3.3#PBF, LT1931IS5#TRMPBF offers higher output current and frequency but sacrifices micropower performance, while TPS62231DRYR delivers superior light-load efficiency and size reduction at the cost of missing integrated battery monitoring - making LTC1174CN8-3.3#PBF optimal for cost-sensitive, battery-life-critical applications with built-in power health awareness.
Availability
LTC1174CN8-3.3#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test equipment, and memory backup supply designs requiring stable component supply, long-lifecycle support, and RoHS-compliant through-hole assembly.
Supply support for LTC1174CN8-3.3#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, documentation, and manufacturing continuity for the LTC portfolio.
The LTC1174 family was designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in battery-powered and portable instrumentation systems where reliability, simplicity, and integrated power monitoring are essential.
FAQ
What is the output voltage tolerance of the LTC1174CN8-3.3#PBF?
The LTC1174CN8-3.3#PBF provides a fixed 3.3V output with guaranteed tolerance of ±3.5% (3.14V to 3.46V) across temperature and line/load conditions. This specification is confirmed in the Electrical Characteristics table of the official datasheet (1174fe, page 3), where VOUT is listed as 3.14/3.30/3.46V min/typ/max at full operating range.
Can the LTC1174CN8-3.3#PBF be used in inverting configurations?
Yes, the LTC1174CN8-3.3#PBF can be configured as an inverting converter to generate negative output voltages such as –3.3V, as demonstrated in Typical Application TA07. Its constant off-time architecture and internal switch support standard inverting buck-boost topology with appropriate external component selection and layout attention to SW node ringing.
What is the maximum recommended output current for LTC1174CN8-3.3#PBF in the N8 package?
The maximum continuous output current for LTC1174CN8-3.3#PBF is 175mA at VOUT=3.3V and VIN=5V (per Typical Application TA04). This limit is thermally constrained by the N8 PDIP package's θJA = 110°C/W; exceeding this current risks junction temperature exceeding 125°C under typical ambient conditions without heatsinking.
How does the low-battery detector function on the LTC1174CN8-3.3#PBF?
The LTC1174CN8-3.3#PBF's low-battery detector compares a resistor-divided VIN to an internal 1.25V reference on LBIN (Pin 3). When the divided voltage drops below 1.25V, LBOUT (Pin 2) sinks current to signal low battery. Hysteresis (7.5–30mV) prevents chatter, and the trip point is fully user-adjustable via external resistors - as shown in Figure 3 and TA03/TA04 schematics.
Is the LTC1174CN8-3.3#PBF pin-compatible with other variants in the LTC1174 family?
Yes, all LTC1174 variants including LTC1174CN8-3.3#PBF, LTC1174CN8-5, and LTC1174CN8 share identical N8 PDIP-8 pinouts and footprints. The only functional differences are output voltage (3.3V vs 5V), current limit selection behavior, and minor electrical specs - allowing direct substitution in existing layouts when output voltage requirements align.
LTC1174CN8-3.3#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):
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1174CN8-3.3#PBF FAQ
1.How can I place an order for LTC1174CN8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174CN8-3.3#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 LTC1174CN8-3.3#PBF reliable?
The price and inventory of LTC1174CN8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174CN8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174CN8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174CN8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174CN8-3.3#PBF?
LTC1174CN8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174CN8-3.3#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 LTC1174CN8-3.3#PBF?
For technical support, including LTC1174CN8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174CN8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1174CN8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174CN8-3.3#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 LTC1174CN8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174CN8-3.3#PBF?
All LTC1174CN8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174CN8-3.3#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 LTC1174CN8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1174CN8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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