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Analog Devices Inc. LTC1174HVCS8-3.3#PBF
- Part No.:
- LTC1174HVCS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174HVCS8-3.3#PBF.pdf
- Description:
- IC REG BUCK BOOST 3.3V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC1174HVCS8-3.3#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down DC/DC converter IC with integrated 0.9Ω P-channel MOSFET switch, optimized for 4V–18.5V input to fixed 3.3V output at up to 175mA load. It features pin-selectable current limit (340mA/600mA), 130µA standby current, low-battery detection, and operates in Burst Mode® for light-load efficiency. Used in portable instruments and battery-powered equipment requiring stable low-noise 3.3V rails.
For engineers reviewing the LTC1174HVCS8-3.3#PBF datasheet, LTC1174HVCS8-3.3#PBF pinout, LTC1174HVCS8-3.3#PBF application, or LTC1174HVCS8-3.3#PBF equivalent, key selection criteria include input voltage range (4V–18.5V), regulated output tolerance (±5%), peak switch current rating (0.6A), thermal performance (θJA = 150°C/W), and compatibility with standard surface-mount inductors and Schottky catch diodes.
Technical Context
The LTC1174HVCS8-3.3#PBF employs a constant off-time architecture with internal 1.25V reference and fixed resistive feedback divider, enabling stable regulation without external compensation. Its switching frequency varies with input-output differential (e.g., ~111kHz at VIN=9V, VOUT=3.3V), and it automatically transitions between continuous conduction mode and Burst Mode® to maintain high efficiency across 1mA–175mA loads.
It integrates low-battery detection via LBIN/LBOUT pins (trip point 1.25V ±0.15V), active-low micropower shutdown (2µA max), and short-circuit protection with programmable current limit. The HV variant extends absolute maximum input voltage to 18.5V versus 13.5V for standard LTC1174, supporting wider industrial and automotive input ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.30V ±4.7% (3.14V–3.46V); tightly regulated for logic supply compliance |
| Input Voltage Range | 4V to 18.5V; supports wide battery chemistries including 4×NiCd or 3–4×Li-ion |
| Max Output Current | 175mA at VOUT=3.3V, VIN=6V; derates with higher VIN due to thermal limits |
| Efficiency | Up to 94% at 100mA load; enables >100hr runtime on AA batteries in portable devices |
| Quiescent Current | 130µA typical in sleep mode; critical for always-on battery backup systems |
| Switch RON | 0.90Ω typical at VIN=9V; minimizes conduction loss in high-current pulses |
| Shutdown Current | 2µA max; preserves battery life during extended storage or sleep states |
Pinout & Package
Package: 8-lead plastic SO (S8), 150°C/W junction-to-ambient thermal resistance, RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output / feedback node | Fixed 3.3V output; internal resistor divider eliminates external components |
| LBOUT (Pin 2) | Open-drain low-battery indicator output | Sinks up to 1.5mA when LBIN falls below 1.25V; drives LED or MCU interrupt |
| LBIN (Pin 3) | Inverting input of low-battery comparator | Accepts external resistor divider to set trip point (e.g., 5.5V input = 1.25V at pin) |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, feedback, and comparator circuits; requires low-impedance layout |
| SW (Pin 5) | Drain of internal P-channel MOSFET | Connects directly to cathode of Schottky catch diode and inductor; high dv/dt node |
| VIN (Pin 6) | Main power input (4V–18.5V) | Must be decoupled with ≥0.1µF ceramic + bulk capacitor; feeds internal switch and bias |
| IPGM (Pin 7) | Current limit programming input | Logic-high = 600mA limit; logic-low = 340mA limit; sets peak inductor current |
| SHUTDOWN (Pin 8) | Active-low enable control | Pull to GND for <2µA shutdown; float or tie to VIN for normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >85% efficiency down to 1mA load by disabling switching and entering ultra-low-power sleep |
| Pin-selectable current limit | Supports dual optimization: 340mA for low-ripple/low-noise designs, 600mA for higher output capability |
| Integrated 0.9Ω P-MOSFET | Eliminates external high-side switch; reduces BOM count and PCB area vs discrete solutions |
| Low-battery detector with hysteresis | 7.5–30mV hysteresis prevents chatter; LBOUT provides direct interface to microcontroller GPIO |
| Only four external components required | Inductor, Schottky diode, input capacitor, output capacitor - enables rapid prototyping and compact layout |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered wearable ECG sensor operating 24/7 on two AA cells with periodic wireless transmission. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator for MCU, ADC, and BLE radio; regulates down from declining 3.2–4.2V battery stack. Use Value: 130µA sleep current extends battery life beyond 6 months; Burst Mode® ensures consistent 3.3V supply during sensor idle periods. | Use Scenario: Remote environmental monitor deployed in field enclosures with 12V lead-acid backup and solar charging. IC Role / Device Role / Timing Role: Step-down regulator converting 9–15V unregulated input to clean 3.3V for microcontroller and SD card interface. Use Value: 18.5V absolute max input withstands load-dump transients; low-dropout operation maintains regulation until battery reaches 4V. |
| Handheld Test Equipment | Memory Backup Supply |
Use Scenario: Pocket-sized multimeter with LCD display, analog front-end, and rechargeable Li-ion battery. IC Role / Device Role / Timing Role: Main 3.3V supply for digital core and precision reference; coexists with 5V analog rail. Use Value: 94% peak efficiency minimizes self-heating in sealed enclosure; low EMI Burst Mode® avoids interference with sensitive measurements. | Use Scenario: SRAM retention circuit maintaining 3.3V during main power failure in industrial PLC controller. IC Role / Device Role / Timing Role: Low-quiescent backup regulator powered by supercapacitor or coin cell after primary supply loss. Use Value: 2µA shutdown current preserves supercap energy for >72 hours; fixed 3.3V output matches SRAM VDD spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1931ES5#TRMPBF | Fixed 3.3V output, 1.25MHz constant-frequency PWM, no Burst Mode®, 600mA switch, 2.7–20V input | Higher switching frequency enables smaller inductors but increases EMI; less efficient at light loads | Choose for noise-sensitive analog systems needing predictable frequency; avoid for battery longevity-critical designs |
| TPS62231DRYR | 3.3V output, 3MHz synchronous buck, 2.05–6.5V input, 400mA, 17µA quiescent, no low-battery detect | Narrower input range; lacks LBIN/LBOUT functionality and HV rating; requires external sync or enable | Prefer for space-constrained PCBs where 6.5V max input suffices; not suitable for 12V+ battery or industrial inputs |
Compared with LT1931ES5#TRMPBF and TPS62231DRYR, the LTC1174HVCS8-3.3#PBF uniquely combines wide 4–18.5V input, integrated low-battery detection, and ultra-low 130µA sleep current-making it optimal for long-life, high-voltage battery systems where feature integration outweighs switching frequency demands.
Availability
LTC1174HVCS8-3.3#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial data loggers, and memory backup supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1174HVCS8-3.3#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1174HVCS8-3.3#PBF belongs to ADI's legacy Linear Technology DC/DC converter product line, designed specifically for cost-sensitive, low-to-medium power battery-operated systems requiring high efficiency, minimal external components, and robust protection features.
FAQ
What is the maximum input voltage rating for the LTC1174HVCS8-3.3#PBF?
The LTC1174HVCS8-3.3#PBF has an absolute maximum input voltage rating of 18.5V on the VIN pin, distinguishing it from the standard LTC1174 (13.5V max). This HV rating allows reliable operation across wider battery chemistries and unregulated industrial supplies, provided the SW pin voltage remains within VIN – 18.5V limits per datasheet Absolute Maximum Ratings.
Does the LTC1174HVCS8-3.3#PBF require external feedback resistors to set the 3.3V output?
No, the LTC1174HVCS8-3.3#PBF does not require external feedback resistors. It integrates a precision internal resistive divider that fixes the output voltage at 3.30V ±4.7%, eliminating external components and simplifying design. Only the adjustable version (LTC1174HVCS8) uses external resistors on the VFB pin.
How does the low-battery detection function work on the LTC1174HVCS8-3.3#PBF?
The LTC1174HVCS8-3.3#PBF implements low-battery detection using an internal 1.25V reference comparator. An external resistor divider applied to LBIN (Pin 3) scales the input voltage; when this scaled voltage drops below 1.25V, LBOUT (Pin 2) pulls low to sink up to 1.5mA, signaling battery depletion to an external load or microcontroller.
What is the purpose of the IPGM pin on the LTC1174HVCS8-3.3#PBF?
The IPGM pin (Pin 7) on the LTC1174HVCS8-3.3#PBF selects the peak inductor current limit: tying IPGM to GND sets the limit to 340mA, while tying it to VIN sets it to 600mA. This allows designers to optimize for either lower ripple/noise (340mA) or higher output current capability (600mA) without changing the IC or layout.
Can the LTC1174HVCS8-3.3#PBF be used in inverting (negative output) configurations?
Yes, the LTC1174HVCS8-3.3#PBF can be configured as an inverting converter to generate –3.3V. The datasheet provides reference schematics (e.g., Figure 1174 TA07) showing proper connection of the inductor, Schottky diode, and output capacitor. Input voltage headroom must account for the absolute maximum ratings of the SW pin relative to VIN in this topology.
LTC1174HVCS8-3.3#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):
- 18.5V
- 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
LTC1174HVCS8-3.3#PBF FAQ
1.How can I place an order for LTC1174HVCS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174HVCS8-3.3#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 LTC1174HVCS8-3.3#PBF reliable?
The price and inventory of LTC1174HVCS8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174HVCS8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174HVCS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174HVCS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174HVCS8-3.3#PBF?
LTC1174HVCS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174HVCS8-3.3#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 LTC1174HVCS8-3.3#PBF?
For technical support, including LTC1174HVCS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174HVCS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1174HVCS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174HVCS8-3.3#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 LTC1174HVCS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174HVCS8-3.3#PBF?
All LTC1174HVCS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174HVCS8-3.3#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 LTC1174HVCS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1174HVCS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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