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Analog Devices Inc. LTC1174HVIS8#PBF
- Part No.:
- LTC1174HVIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174HVIS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:367
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Product details
Overview
LTC1174HVIS8#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down and inverting DC/DC converter IC with internal 0.9Ω P-channel MOSFET switch, pin-selectable 340mA/600mA current limit, 4V–18.5V input range, and 130µA standby current. It delivers regulated 5V output in fixed-output configuration and supports battery-powered portable instruments, memory backup supplies, and distributed power systems.
For engineers reviewing the LTC1174HVIS8#PBF datasheet, LTC1174HVIS8#PBF pinout, LTC1174HVIS8#PBF application, or LTC1174HVIS8#PBF equivalent, key selection criteria include wide VIN range (4V–18.5V), low-dropout operation, active-low micropower shutdown (1µA), integrated low-battery detector (1.25V trip), and compatibility with standard surface-mount inductors and Schottky catch diodes.
Technical Context
The LTC1174HVIS8#PBF uses a constant off-time current-mode architecture with wafer-sort-trimmed 4µs switch off-time, enabling frequency variation with input–output voltage differential. Its control loop automatically transitions between continuous conduction mode and Burst Mode® for light-load efficiency optimization.
Output regulation is achieved via a 1.25V internal reference compared against feedback voltage from an internal resistive divider (fixed 5V version). The low-battery comparator monitors VIN through external resistor network at LBIN (Pin 3), sinking current at LBOUT (Pin 2) when input drops below 1.25V threshold with 7.5–30mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 18.5V - supports wide-input battery and industrial supply rails without external pre-regulation |
| VOUT | 5.00V ±2.5% - factory-trimmed fixed output eliminates external feedback resistors |
| IPEAK Limit | 340mA (IPGM = 0V) or 600mA (IPGM = VIN) - selectable overcurrent protection prevents inductor saturation |
| Efficiency | Up to 94% at 300mA - enables thermally constrained portable designs with minimal heatsinking |
| Quiescent Current | 130µA active / 1µA shutdown - extends battery life in always-on monitoring applications |
| Switch RON | 0.9Ω typical at VIN = 9V - reduces conduction loss and thermal rise in high-current step-down paths |
| Operating Frequency | ~42kHz to ~111kHz - varies with VIN–VOUT; enables use of compact 50–100µH surface-mount inductors |
Pinout & Package
Package: 8-lead plastic SO (S8), RoHS-compliant, lead-free (#PBF), 150°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output voltage node / feedback input | Fixed 5V output terminal; internally connected to precision resistive divider - no external resistor required |
| LBOUT (Pin 2) | Open-drain N-channel pull-down output | Sinks up to 1.2mA when LBIN falls below 1.25V; drives LED or microcontroller interrupt for battery alert |
| LBIN (Pin 3) | Inverting input of low-battery comparator | Accepts external resistive divider from VIN; sets trip point at 1.25V reference 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 PCB plane |
| SW (Pin 5) | Drain of internal P-channel MOSFET switch | Connects directly to cathode of Schottky catch diode and inductor; high dv/dt node requiring tight layout |
| VIN (Pin 6) | Main input supply connection | 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 peak inductor current |
| SHUTDOWN (Pin 8) | Active-low enable control | Pull to GND for <1µA shutdown; float or pull to VIN for normal operation; high-impedance input |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.9Ω P-channel MOSFET | Eliminates external high-side switch and gate driver; reduces BOM count and layout complexity |
| Burst Mode® operation | Maintains >85% efficiency down to 1mA load by disabling switching and entering ultra-low-power sleep state |
| Pin-selectable current limit | Enables single-footprint design across 340mA and 600mA output requirements without layout change |
| Low-battery detection with hysteresis | Provides reliable undervoltage warning with 7.5–30mV hysteresis to prevent chatter during battery sag |
| Only four external components required | Inductor, Schottky diode, input capacitor, output capacitor - simplifies qualification and reduces cost |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered wearable ECG sensor operating from two 3.7V Li-ion cells with 5V analog front-end and BLE radio. IC Role / Device Role / Timing Role: Primary 5V step-down regulator delivering stable rail to ADC, op-amps, and RF transceiver. Use Value: 94% peak efficiency and 130µA quiescent current extend runtime beyond 72 hours on 500mAh cell; low-battery flag triggers graceful shutdown before data loss. | Use Scenario: Remote environmental monitor using 4xAA alkaline pack (6V nominal) logging temperature/humidity every 10 seconds. IC Role / Device Role / Timing Role: Main 5V supply for microcontroller, SD card, and sensor interface; supports brown-out detection during battery depletion. Use Value: Wide 4–18.5V input accommodates full battery discharge curve (up to 9V fresh); IPGM pin allows current limit tuning for varying sensor burst loads. |
| Memory Backup Power | Handheld Test Equipment |
Use Scenario: SRAM-based embedded controller retaining configuration during main power interruption. IC Role / Device Role / Timing Role: Inverting –5V converter generating negative bias for EEPROM write protection circuitry. Use Value: Fixed LTC1174HV-5 variant enables clean –5V rail from same 5V system bus; short-circuit protection prevents latch-up during EEPROM hot-plug events. | Use Scenario: Portable multimeter with LCD display, analog measurement front-end, and USB charging port. IC Role / Device Role / Timing Role: Dual-role regulator: step-down 9V battery to 5V for logic, and inverting to –5V for LCD bias supply. Use Value: Single IC replaces two discrete converters; 1µA shutdown current preserves battery during storage; SW pin layout guidance minimizes EMI on sensitive analog inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1931IS8#PBF | Higher 1.25MHz fixed-frequency operation; 300mA max output; no low-battery detector | Requires smaller inductor but lacks VIN monitoring; less suitable for battery-state-aware systems | Choose LT1931IS8#PBF when board space is critical and battery monitoring is handled externally |
| TPS61040DRVR | Boost-only topology; 28V output capability; 0.5A switch; no inverting mode | Cannot generate negative voltages; optimized for low-input boost (e.g., single-cell Li-ion to 3.3V) | Choose TPS61040DRVR only for boost applications where negative rail generation is unnecessary |
Compared with LT1931IS8#PBF and TPS61040DRVR, the LTC1174HVIS8#PBF uniquely combines step-down, inverting, low-battery detection, and micropower shutdown in one SO-8 package - making it optimal for dual-rail battery-powered instrumentation where feature integration outweighs switching frequency demands.
Availability
LTC1174HVIS8#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, memory backup power, handheld test equipment requiring stable component supply and long-term production continuity.
Supply support for LTC1174HVIS8#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 LTC1174 family.
The LTC1174 product line was designed for high-efficiency, low-component-count DC/DC conversion in battery-constrained and space-limited applications - emphasizing simplicity, reliability, and extended runtime over ultra-high switching frequencies.
FAQ
What is the maximum input voltage rating for the LTC1174HVIS8#PBF?
The LTC1174HVIS8#PBF has an absolute maximum input supply voltage (VIN) of 18.5V, as specified in the Absolute Maximum Ratings table. This HV variant supports wider input ranges than standard LTC1174 versions (13.5V max), making it suitable for 12V automotive or industrial supply rails with transient headroom. Operation above 18.5V risks permanent damage.
Does the LTC1174HVIS8#PBF require external feedback resistors to set the 5V output?
No, the LTC1174HVIS8#PBF does not require external feedback resistors. It is the fixed 5V output variant (LTC1174HV-5) with an internal precision resistive divider connected to the VOUT (Pin 1) terminal. The output is factory-trimmed to 5.00V ±2.5% across temperature and load, eliminating external resistor placement and tolerance concerns.
How does the low-battery detection function work on the LTC1174HVIS8#PBF?
The LTC1174HVIS8#PBF implements low-battery detection using an internal 1.25V reference compared against a voltage divider connected to LBIN (Pin 3). When the divided VIN drops below 1.25V, LBOUT (Pin 2) sinks up to 1.2mA to signal undervoltage. Hysteresis (7.5–30mV) prevents oscillation during battery sag. The LTC1174HVIS8#PBF's LBOUT remains indeterminate during shutdown.
Can the LTC1174HVIS8#PBF be used in inverting (positive-to-negative) configurations?
Yes, the LTC1174HVIS8#PBF supports inverting operation to generate negative outputs such as –5V. In this configuration, the output is taken from the GND pin while VIN connects to what becomes the negative rail. The LTC1174HVIS8#PBF's wide 4–18.5V input range and internal switch enable robust –5V generation from 5V or 9V sources, as validated in Typical Application TA06.
What is the purpose of the IPGM pin on the LTC1174HVIS8#PBF?
The IPGM (Pin 7) on the LTC1174HVIS8#PBF selects the peak inductor current limit: tying IPGM to GND sets IPEAK = 340mA, while tying it to VIN sets IPEAK = 600mA. This pin enables a single PCB layout to support two output current levels without redesign, optimizing efficiency across light and heavy load conditions in the same application.
LTC1174HVIS8#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 18.5V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 340mA, 600mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1174HVIS8#PBF FAQ
1.How can I place an order for LTC1174HVIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174HVIS8#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 LTC1174HVIS8#PBF reliable?
The price and inventory of LTC1174HVIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174HVIS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174HVIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174HVIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174HVIS8#PBF?
LTC1174HVIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174HVIS8#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 LTC1174HVIS8#PBF?
For technical support, including LTC1174HVIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174HVIS8#PBF requirements.
6.How does Aetrix verify that LTC1174HVIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174HVIS8#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 LTC1174HVIS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174HVIS8#PBF?
All LTC1174HVIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174HVIS8#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 LTC1174HVIS8#PBF part is unused and in its original packaging.
Return procedure for LTC1174HVIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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