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Analog Devices Inc. LTC1174HVCS8#TRPBF
- Part No.:
- LTC1174HVCS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174HVCS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,924
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Product details
Overview
LTC1174HVCS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down and inverting DC/DC converter IC with integrated 0.9 Ω P-channel MOSFET switch, pin-selectable 340 mA/600 mA current limit, and wide 4 V to 18.5 V input range. It delivers regulated 5 V output at up to 175 mA in step-down mode or –5 V in inverting mode, supporting battery-powered portable instruments and memory backup supplies.
For engineers reviewing the LTC1174HVCS8#TRPBF datasheet, LTC1174HVCS8#TRPBF pinout, LTC1174HVCS8#TRPBF application, or LTC1174HVCS8#TRPBF equivalent, key selection criteria include its HV-rated input voltage capability, micropower shutdown (2 µA), low-battery detection interface, constant off-time architecture, and minimal external component count (only four required).
Technical Context
The LTC1174HVCS8#TRPBF implements a constant off-time (COT) control architecture with internal timing capacitor trimming, resulting in VIN-dependent switching frequency (e.g., ~111 kHz at VIN = 9 V, VOUT = 5 V). Its current-mode loop uses an internal 0.1 Ω sense resistor and dual comparators for peak-current limiting and burst-mode transition.
It integrates a 1.25 V reference, low-battery comparator with 1.25 V trip threshold and 7.5–30 mV hysteresis, and a micropower shutdown circuit with VIH = 1.2 V and VIL = 0.75 V. The IPGM pin selects between two precise current-limit thresholds (0.34 A or 0.60 A), and the SW pin drives external Schottky catch diodes such as MBRS140T3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 18.5 V - supports wide battery input including 12 V lead-acid and multi-cell Li-ion stacks. |
| Output Voltage | Fixed 5 V (±2.5%) - internally trimmed resistive divider enables stable regulation without external feedback components. |
| Peak Switch Current Limit | 0.34 A or 0.60 A - selectable via IPGM pin; determines maximum inductor current and short-circuit protection level. |
| Quiescent Current | 130 µA (active), 2 µA (shutdown) - enables ultra-low-power operation in battery-backed systems. |
| Switch RDS(ON) | 0.90 Ω (typ.) at VIN = 9 V - defines conduction loss and thermal rise under load. |
| Efficiency | Up to 94% - achieved at mid-load (e.g., 100–300 mA) with 100 µH inductor and optimized layout. |
| Low-Battery Trip | 1.25 V (ref), ±0.15 V hysteresis - allows external resistor divider to set precise input undervoltage lockout (e.g., 5.5 V trip with 162k/4.7k). |
Pinout & Package
Package: 8-lead plastic SO (S8), RoHS-compliant, surface-mount, 150°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Output voltage feedback node | Internally connected to fixed 5 V divider; no external resistor needed for LTC1174HVCS8#TRPBF (fixed-output variant). |
| LBOUT (Pin 2) | Open-drain low-battery indicator output | Sinks up to 1.5 mA when LBIN falls below 1.25 V; requires pull-up for LED or microcontroller interrupt. |
| LBIN (Pin 3) | Inverting input of low-battery comparator | Accepts external resistor divider from VIN; sets undervoltage detection threshold independent of regulator operation. |
| GND (Pin 4) | Power and signal ground reference | Must be low-impedance connection point for CIN, COUT, and Schottky cathode return path. |
| SW (Pin 5) | Drain of internal P-channel MOSFET switch | Connects directly to Schottky diode cathode; high dv/dt node requiring tight layout and Kelvin grounding. |
| VIN (Pin 6) | Main input supply connection | Accepts 4–18.5 V; must be decoupled with ≥10 µF bulk + 0.1 µF ceramic capacitor placed adjacent to pin. |
| IPGM (Pin 7) | Current limit programming input | Logic-level input: tie to VIN for 0.60 A limit, tie to GND for 0.34 A limit; high-impedance, must not float. |
| SHUTDOWN (Pin 8) | Active-low enable control | Pull to GND for <2 µA shutdown; pull to VIN (≥1.2 V) for normal operation; high-impedance, requires defined logic level. |
Key Features
| Feature | Design Value |
|---|---|
| High efficiency up to 94% | Reduces thermal load and extends battery life in portable 5 V rail generation, especially at 100–300 mA loads. |
| Pin-selectable current limit (0.34 A / 0.60 A) | Enables single BOM optimization across varying load requirements without redesigning current-sense network. |
| Integrated 0.9 Ω P-channel MOSFET | Eliminates need for external high-side switch and associated gate driver, reducing board area and component count to just four externals. |
| 130 µA active quiescent current | Supports always-on monitoring circuits (e.g., RTC backup, sensor wake-up) without significant battery drain during standby. |
| Low-battery detector with programmable threshold | Provides system-level power management signaling using only two external resistors-no additional IC or firmware overhead. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous 5 V supply for low-power ADC, microcontroller, and BLE radio in handheld ECG monitor powered by two 3.7 V Li-ion cells in series (7.4 V nominal, up to 8.4 V fully charged). IC Role / Device Role / Timing Role: Primary step-down DC/DC converter delivering regulated 5 V from variable battery input; provides low-noise, high-efficiency power with built-in undervoltage warning. Use Value: Enables >12-hour runtime on 1200 mAh battery pack while maintaining accurate analog measurements via low ripple and stable regulation. | Use Scenario: Long-term environmental monitoring node operating from four AA alkaline cells (6 V fresh, down to 4 V end-of-life), logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Main power converter supplying 5 V to MCU and sensors; leverages low-battery detector to trigger data flush and graceful shutdown before cutoff. Use Value: Extends usable battery life by 28% versus linear regulators and eliminates need for separate UVLO IC or firmware polling. |
| Memory Backup Supply | Industrial Handheld Terminals |
Use Scenario: Maintaining SRAM and real-time clock during main power loss in industrial PLC I/O module, using supercapacitor or coin cell as backup source. IC Role / Device Role / Timing Role: Inverting converter generating –5 V from 3.3 V backup rail to bias EEPROM write-enable circuitry and support dual-rail memory interfaces. Use Value: Delivers clean, isolated negative voltage with <1 µA shutdown current-preserving backup energy for >1 year without recharge. | Use Scenario: Ruggedized warehouse scanner running on hot-swappable 7.2 V NiMH battery pack, requiring 5 V for imager, display backlight, and USB interface. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator handling 4–18.5 V range across battery charge/discharge cycles and transient surges. Use Value: Eliminates need for pre-regulator stage; maintains >90% efficiency across full battery voltage swing, reducing heat in sealed enclosure. |
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 5 V output, 1.25 MHz constant-frequency PWM, 600 mA switch, 2.7–10 V input | Higher switching frequency enables smaller magnetics but lower max input voltage; no low-battery detector | Choose for space-constrained designs needing <1 mm height inductors; avoid where VIN > 10 V or UVLO signaling is required. |
| TPS62231DRYR | 3 MHz synchronous buck, 2.05–6.5 V input, 5 V output, 400 mA, 17 µA IQ | Synchronous rectification improves light-load efficiency; no inverting capability or LB detector; smaller 6-pin WSON package | Prefer for ultra-low-IQ battery applications with strict size limits; not suitable for inverting or high-VIN (>6.5 V) use cases. |
Compared with LT1931IS5#TRMPBF and TPS62231DRYR, the LTC1174HVCS8#TRPBF uniquely combines HV input tolerance (18.5 V), integrated low-battery signaling, and inverting topology support-making it irreplaceable in legacy industrial and medical designs requiring robust undervoltage management and dual-polarity rails.
Availability
LTC1174HVCS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, memory backup supplies, and industrial handheld terminals requiring stable component supply across extended product lifecycles.
Supply support for LTC1174HVCS8#TRPBF 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#TRPBF belongs to ADI's legacy Linear Technology DC/DC converter product line, designed specifically for cost-sensitive, low-component-count power conversion in battery-operated and industrial equipment where reliability, wide input range, and integrated protection features are critical.
FAQ
What is the maximum input voltage rating for the LTC1174HVCS8#TRPBF?
The LTC1174HVCS8#TRPBF has an absolute maximum input voltage rating of 18.5 V on the VIN pin (Pin 6), distinguishing it from the standard LTC1174 (13.5 V max). This HV rating enables direct operation from 12 V automotive or industrial bus rails without pre-regulation. Operation above 18.5 V risks permanent damage per Absolute Maximum Ratings.
Does the LTC1174HVCS8#TRPBF support inverting (negative output) configurations?
Yes, the LTC1174HVCS8#TRPBF supports inverting topologies to generate negative outputs such as –5 V. When configured as an inverter, 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 the 18.5 V absolute max). Application Note 1174 TA06 documents this configuration.
How does the low-battery detector function on the LTC1174HVCS8#TRPBF?
The LTC1174HVCS8#TRPBF's low-battery detector compares a resistor-divided VIN signal at LBIN (Pin 3) against an internal 1.25 V reference. When LBIN falls below 1.25 V, LBOUT (Pin 2) sinks current (up to 1.5 mA) to signal undervoltage. Hysteresis (7.5–30 mV) prevents chatter. During shutdown, the detector is inactive. External resistors set the trip point-for example, 162 kΩ and 4.7 kΩ yield a 5.5 V trip.
What is the purpose of the IPGM pin on the LTC1174HVCS8#TRPBF?
The IPGM pin (Pin 7) on the LTC1174HVCS8#TRPBF selects between two factory-trimmed peak current limits: 0.34 A (when tied to GND) or 0.60 A (when tied to VIN). This adjusts the overcurrent protection threshold and inductor saturation margin without external sensing components. The pin is high-impedance and must be actively pulled-floating causes undefined behavior.
Can the LTC1174HVCS8#TRPBF operate in dropout mode, and how does it behave?
Yes, the LTC1174HVCS8#TRPBF operates in dropout when VIN approaches VOUT. In this condition, the internal P-channel MOSFET remains continuously on, acting like a low-RDS(ON) pass element (0.9 Ω typ.). Output voltage drops linearly with VIN minus ILOAD × RDS(ON), maximizing usable battery capacity. Regulation is lost, but the device continues supplying current without shutdown or oscillation.
LTC1174HVCS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1174HVCS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174HVCS8#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1174HVCS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174HVCS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1174HVCS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174HVCS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174HVCS8#TRPBF?
LTC1174HVCS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174HVCS8#TRPBF 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#TRPBF?
For technical support, including LTC1174HVCS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174HVCS8#TRPBF requirements.
6.How does Aetrix verify that LTC1174HVCS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1174HVCS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1174HVCS8#TRPBF?
All LTC1174HVCS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174HVCS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1174HVCS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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