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Analog Devices Inc. LTC1174HVCS8#PBF
- Part No.:
- LTC1174HVCS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174HVCS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,449
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Product details
Overview
LTC1174HVCS8#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down and inverting DC/DC converter with integrated 0.9 Ω P-channel MOSFET switch, wide 4 V to 18.5 V input range, pin-selectable 340 mA/600 mA current limit, and 130 µA standby current. It enables compact 5 V or –5 V conversion from 9 V battery sources in portable instrumentation.
For engineers reviewing the LTC1174HVCS8#PBF datasheet, LTC1174HVCS8#PBF pinout, LTC1174HVCS8#PBF application, or LTC1174HVCS8#PBF equivalent, key selection criteria include its HV-rated absolute maximum input (18.5 V), low-dropout operation, micropower shutdown (2 µA), programmable current limit via IPGM, and compatibility with standard Schottky catch diodes like MBRS140T3.
Technical Context
The LTC1174HVCS8#PBF uses a constant off-time (COT) architecture with wafer-trimmed 4 µs off-time, enabling frequency variation with input-output voltage differential. Its internal 1.25 V reference feeds a voltage comparator (A1) for output regulation and a current comparator (A2) for peak-current limiting.
It supports both continuous conduction mode and Burst Mode® operation to maintain high efficiency at light loads. The low-battery detector compares VIN-derived voltage at LBIN (Pin 3) against 1.25 V, sinking up to 0.8 mA at LBOUT (Pin 2) when triggered.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 18.5 V - Enables direct operation from 12 V automotive or multi-cell Li-ion/NiCd stacks without pre-regulation. |
| Output Voltage Options | Fixed 5 V (±2.5%) or 3.3 V (±5%) - Pin-compatible variants; LTC1174HVCS8#PBF is the HV base part supporting external feedback. |
| Peak Switch Current Limit | 340 mA (IPGM = 0 V) or 600 mA (IPGM = VIN) - Selectable per application load and inductor sizing needs. |
| Efficiency | Up to 94% at 300 mA - Achieved with low RDS(ON) (0.9–1.55 Ω) and optimized gate drive minimizing switching losses. |
| Quiescent Current | 130 µA active / 2 µA shutdown - Extends battery life in always-on portable equipment with infrequent wake cycles. |
| Switch Off-Time | 4 µs (typical, wafer-trimmed) - Determines minimum operating frequency and enables stable COT control across input range. |
| Low-Battery Threshold | 1.25 V reference with 7.5–30 mV hysteresis - Allows precise VIN monitoring via external resistor divider on LBIN/LBOUT pins. |
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) | Feedback input / regulated output sense | Connects to internal 1.25 V reference comparator; used directly for fixed-output versions or with external divider for adjustable outputs. |
| LBOUT (Pin 2) | Open-drain low-battery indicator output | Sinks up to 0.8 mA when LBIN voltage drops below 1.25 V; requires pull-up for LED or microcontroller interrupt. |
| LBIN (Pin 3) | Inverting input of low-battery comparator | Accepts divided input voltage; negligible input current (<0.5 µA) enables high-impedance resistor networks. |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, feedback, and comparator circuits; must be low-impedance for stability and EMI control. |
| SW (Pin 5) | Drain of internal P-channel MOSFET | Switching node connecting to catch diode cathode and inductor; requires tight layout to minimize ringing and EMI. |
| VIN (Pin 6) | Main power input supply | Accepts 4–18.5 V; must be decoupled with ≥0.1 µF ceramic + bulk capacitor close to pin. |
| IPGM (Pin 7) | Current limit programming input | Logic-level select: tie to GND for 340 mA limit, to VIN for 600 mA limit; high-impedance, must not float. |
| SHUTDOWN (Pin 8) | Active-low enable control | Pull ≤0.75 V to disable converter and reduce supply current to 2 µA; requires pull-up during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.9 Ω P-MOSFET switch | Reduces external component count to only four (inductor, diode, two capacitors) and eliminates gate driver design effort. |
| Pin-selectable current limit (340/600 mA) | Enables optimization of inductor size and thermal performance without changing BOM for different load requirements. |
| Burst Mode® operation | Maintains >85% efficiency down to 1 mA load by disabling switching and entering ultra-low-power sleep state. |
| Low-dropout operation | Extends usable battery life by sustaining regulation until VIN approaches VOUT, critical for single-cell or aging battery systems. |
| Short-circuit protection | Combines current limiting with extended off-time to safely clamp output faults without latch-up or thermal runaway. |
Applications
| Portable Instruments | Battery-Powered Equipment |
|---|---|
Use Scenario: Handheld multimeter powered by 9 V alkaline battery requiring stable 5 V for MCU and analog front-end. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 5 V from 6–9 V battery range with low-noise output and battery end-of-life detection. Use Value: 94% peak efficiency extends battery life beyond 100 hours; LBIN/LBOUT interface provides visual low-battery alert without additional IC. | Use Scenario: Wireless sensor node using two AA cells (2.4–3.2 V) boosted to 5 V for RF transceiver and microcontroller. IC Role / Device Role / Timing Role: Inverting converter configured as negative boost stage to generate –5 V rail for op-amp biasing and precision ADC reference. Use Value: Wide 4–18.5 V input range accommodates stacked battery configurations; 130 µA quiescent current preserves energy during sleep intervals. |
| Memory Backup Supply | Distributed Power Systems |
Use Scenario: SRAM backup circuit in industrial PLC retaining configuration during main power loss. IC Role / Device Role / Timing Role: Low-quiescent inverting converter generating –5 V from 3.3 V system rail to bias non-volatile memory retention circuitry. Use Value: Micropower shutdown (2 µA) minimizes drain on backup coin cell; pin-selectable current limit ensures safe charge/discharge cycling. | Use Scenario: Point-of-load regulation in telecom line card where 12 V backplane supplies isolated 3.3 V logic rails. IC Role / Device Role / Timing Role: Compact, low-component-count step-down converter providing local 3.3 V regulation with fast transient response. Use Value: Constant off-time architecture delivers consistent regulation across varying input ripple; 8-pin SO package simplifies layout in dense PCB environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1174CS8#PBF | Standard input rating (–0.3 V to 13.5 V); same pinout and features but lower max VIN. | Not suitable for 15–18 V inputs; appropriate for 5–12 V systems with tighter voltage margins. | Select when input never exceeds 13.5 V to reduce cost; verify dropout behavior at system minimum VIN. |
| LT1931IS8#PBF | Higher switching frequency (1.25 MHz), smaller inductors, but fixed 5 V output and no low-battery detector. | Lacks LBIN/LBOUT functionality and programmable current limit; optimized for space-constrained, fixed-output designs. | Choose for ultra-compact layouts where battery monitoring is handled externally and higher frequency reduces filter size. |
Compared with LTC1174CS8#PBF, the LTC1174HVCS8#PBF supports 5 V higher input voltage headroom and maintains identical efficiency and quiescent current; versus LT1931IS8#PBF, it trades higher-frequency operation for integrated battery monitoring and wider input flexibility.
Availability
LTC1174HVCS8#PBF is available at Aetrix Electronics and suitable for portable instruments, battery-powered equipment, memory backup supplies, and distributed power systems requiring stable component supply with long-term manufacturability.
Supply support for LTC1174HVCS8#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 continues to manufacture and support its precision analog and power management portfolio.
The LTC1174HVCS8#PBF belongs to Linear's legacy high-efficiency monolithic DC/DC converter family, designed specifically for low-component-count, battery-sensitive applications demanding wide input range and micropower operation.
FAQ
What is the maximum input voltage rating for the LTC1174HVCS8#PBF?
The LTC1174HVCS8#PBF has an absolute maximum input voltage rating of 18.5 V on the VIN pin (Pin 6). This distinguishes it from the standard LTC1174CS8#PBF (13.5 V max), making it suitable for 12–15 V industrial or automotive-supplied systems where transient overvoltage may occur. Operation above 18.5 V risks permanent damage.
How does the IPGM pin affect current limiting in the LTC1174HVCS8#PBF?
The IPGM pin (Pin 7) selects the peak inductor current limit in the LTC1174HVCS8#PBF: tying it to GND sets the limit to 340 mA, while tying it to VIN raises it to 600 mA. This adjustment directly impacts inductor sizing, thermal performance, and short-circuit robustness-no external components are required to change the limit.
Can the LTC1174HVCS8#PBF be used in inverting (negative output) configurations?
Yes, the LTC1174HVCS8#PBF supports inverting topologies. When configured as a negative-output converter (e.g., +9 V to –5 V), the output is referenced to the GND pin, and the maximum allowable VIN is reduced by the magnitude of the negative output (e.g., 12 V max for –5 V output to maintain 1.5 V headroom below absolute max ratings).
What is the function of the LBIN and LBOUT pins on the LTC1174HVCS8#PBF?
The LBIN pin (Pin 3) is the inverting input of an internal comparator referenced to 1.25 V; applying a resistor-divided VIN to LBIN triggers the low-battery alert. When LBIN falls below 1.25 V, LBOUT (Pin 2) sinks up to 0.8 mA, enabling direct LED drive or microcontroller interrupt signaling-no external comparator is needed.
Does the LTC1174HVCS8#PBF require an external timing capacitor?
No, the LTC1174HVCS8#PBF does not require an external timing capacitor. Its constant off-time architecture uses an internal, wafer-trimmed timing element with a typical off-time of 4 µs. This eliminates external component dependencies and improves production consistency compared to oscillator-based controllers.
LTC1174HVCS8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1174HVCS8#PBF FAQ
1.How can I place an order for LTC1174HVCS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174HVCS8#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#PBF reliable?
The price and inventory of LTC1174HVCS8#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1174HVCS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174HVCS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174HVCS8#PBF?
LTC1174HVCS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174HVCS8#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#PBF?
For technical support, including LTC1174HVCS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174HVCS8#PBF requirements.
6.How does Aetrix verify that LTC1174HVCS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1174HVCS8#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1174HVCS8#PBF?
All LTC1174HVCS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174HVCS8#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#PBF part is unused and in its original packaging.
Return procedure for LTC1174HVCS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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