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Analog Devices Inc. LTC1174HVCS8-3.3#TRPBF
- Part No.:
- LTC1174HVCS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174HVCS8-3.3#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 3.3V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,331
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Product details
Overview
LTC1174HVCS8-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down DC/DC converter IC with integrated 0.9 Ω P-channel MOSFET switch, optimized for 4 V to 18.5 V input and fixed 3.3 V output at up to 175 mA load. It features pin-selectable current limit (340 mA or 600 mA), low-battery detection, micropower shutdown (2 µA), and operates up to 200 kHz - enabling compact designs in portable instrumentation and battery-powered systems.
For engineers reviewing the LTC1174HVCS8-3.3#TRPBF datasheet, LTC1174HVCS8-3.3#TRPBF pinout, LTC1174HVCS8-3.3#TRPBF application, or LTC1174HVCS8-3.3#TRPBF equivalent, key selection criteria include its wide 4–18.5 V input range, ±3% output voltage accuracy over temperature, 130 µA standby current, internal current limiting, and compatibility with standard surface-mount inductors and Schottky catch diodes.
Technical Context
The LTC1174HVCS8-3.3#TRPBF uses a constant off-time (COT) architecture with wafer-trimmed timing capacitor, resulting in VIN-dependent switching frequency (e.g., ~111 kHz at VIN=9 V, VOUT=5 V). Its control loop alternates between continuous conduction mode and Burst Mode® operation to maintain regulation while minimizing quiescent current under light loads.
Output voltage is set by an internal resistive divider (3.3 V fixed), referenced to a 1.25 V bandgap. The low-battery detector compares VIN-derived voltage at LBIN (Pin 3) against this reference, sinking current at LBOUT (Pin 2) when input drops below 1.25 V (typical trip point 1.25–1.4 V). Current limit is selected via IPGM (Pin 7): 0 V → 340 mA, VIN → 600 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.30 V ±3% (guaranteed over full temperature range; enables stable logic supply without external feedback) |
| Input Voltage Range | 4 V to 18.5 V (supports 4×NiCd, 3–4×Li-ion, or wide industrial rails without pre-regulation) |
| Peak Efficiency | 94% (achieved at mid-load; reduces thermal stress and extends battery life in portable devices) |
| Quiescent Current | 130 µA (active mode, IPGM = 0 V); enables >1-year battery life in always-on monitoring applications) |
| Shutdown Current | 2 µA (max at VSHUTDOWN = 0 V, VIN ≤ 16 V; critical for ultra-low-power sleep states) |
| Switch RDS(ON) | 0.90 Ω (typ, at VIN = 9 V); limits conduction loss and self-heating during high-current pulses) |
| Current Limit Options | 340 mA (IPGM = 0 V) or 600 mA (IPGM = VIN); allows trade-off between peak output capability and inductor size) |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 150°C/W junction-to-ambient thermal resistance, RoHS-compliant and lead-free (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output / feedback node | Fixed 3.3 V output; internally connected to precision resistive divider - no external components required |
| LBOUT (Pin 2) | Low-battery indicator open-drain output | Sinks up to 1.5 mA when LBIN falls below 1.25 V; drives LED or microcontroller interrupt pin directly |
| LBIN (Pin 3) | Low-battery comparator inverting input | Accepts external resistor divider from VIN; sets trip point (e.g., 5.5 V with 162k/4.7k) - hysteresis 7.5–30 mV prevents chatter |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, feedback, and low-battery circuitry; must be low-impedance plane for stability |
| SW (Pin 5) | Switch node (drain of internal P-MOSFET) | Connects directly to cathode of Schottky catch diode and inductor; high dv/dt node requiring tight layout |
| VIN (Pin 6) | Main input supply (4–18.5 V) | Must be decoupled with ≥10 µF electrolytic + 0.1 µF ceramic close to pin; RMS current rating critical for CIN |
| IPGM (Pin 7) | Current limit programming input | Logic-level select: tie to GND for 340 mA limit, or to VIN for 600 mA - determines inductor saturation margin |
| SHUTDOWN (Pin 8) | Active-low enable control | Pull to GND for <2 µA shutdown; float or pull to VIN for operation; VIH ≥ 1.2 V, VIL ≤ 0.75 V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.9 Ω P-channel MOSFET | Eliminates external high-side switch; reduces BOM count and PCB area vs discrete solutions |
| Burst Mode® operation | Maintains regulation at light loads while cutting quiescent current to 130 µA - extends battery runtime |
| Pin-selectable current limit | Enables one footprint to support two output current tiers (340/600 mA), simplifying inventory and design reuse |
| Low-battery detector with hysteresis | Provides system-level power management using only two external resistors - no additional IC needed |
| Only four external components required | Inductor, Schottky diode, input/output capacitors - accelerates prototyping and lowers bill-of-materials cost |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG front-end with 3.3 V ADC, microcontroller, and BLE radio operating from 3×AA cells (4.5–6 V) or Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary 3.3 V power rail regulator with low-noise output and battery health monitoring. Use Value: 94% efficiency preserves battery capacity; LBOUT triggers firmware alert before brownout; 130 µA sleep current enables multi-week deployment. |
Use Scenario: Remote environmental monitor powered by 12 V solar-charged battery, logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Step-down converter supplying 3.3 V to MCU and sensors; LBIN/LBOUT used for state-of-charge estimation. Use Value: Wide 4–18.5 V input accommodates variable solar voltage; 2 µA shutdown minimizes leakage during long idle periods. |
| Handheld Test Equipment | Smart Meter Auxiliary Power |
Use Scenario: Pocket-sized multimeter with LCD display, analog front-end, and USB interface, running on 9 V alkaline battery. IC Role / Device Role / Timing Role: Efficient 9 V-to-3.3 V conversion for digital core; SW pin drives compact inductor/diode stage. Use Value: High efficiency (>90% at 100 mA) avoids heat buildup in sealed enclosure; 200 kHz operation allows small 50 µH inductor. |
Use Scenario: Electricity meter with isolated RS-485 communication, requiring clean 3.3 V supply derived from 12–24 V auxiliary rail. IC Role / Device Role / Timing Role: Non-isolated buck regulator feeding isolated DC-DC module; GND-referenced design simplifies layout. Use Value: Internal 0.9 Ω switch eliminates gate driver complexity; robust short-circuit protection prevents field failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | Higher 2.05 V min input; 3.0 V to 5.5 V input range; 1.2 MHz fixed-frequency PWM; lower 17 µA quiescent current | Not suitable for 4 V start-up or >5.5 V inputs; better for ultra-low-IQ apps with tighter input rails | Select if input is strictly 3–5.5 V and sub-20 µA IQ is mandatory; requires external feedback for 3.3 V |
| MAX17503GEE+T | Wider 4.5–60 V input; 2.5 A output; external MOSFETs; requires compensation network and more components | Designed for high-power industrial supplies; not drop-in due to different topology and pinout | Choose for >500 mA loads or >18.5 V inputs; adds design complexity but scales to higher power |
Compared with TPS62231DRVR and MAX17503GEE+T, the LTC1174HVCS8-3.3#TRPBF uniquely balances wide-input capability (4–18.5 V), minimal external parts (4 total), and integrated low-battery detection - making it optimal for cost-sensitive, battery-backed 3.3 V systems where simplicity and feature integration outweigh ultra-low IQ or high-current needs.
Availability
LTC1174HVCS8-3.3#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and handheld test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1174HVCS8-3.3#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1174HVCS8-3.3#TRPBF belongs to Linear's legacy high-efficiency DC/DC converter family, designed specifically for space-constrained, battery-operated systems needing simple, reliable, and feature-rich step-down regulation without external feedback networks.
FAQ
What is the maximum input voltage rating for the LTC1174HVCS8-3.3#TRPBF?
The LTC1174HVCS8-3.3#TRPBF has an absolute maximum input voltage of 18.5 V on the VIN pin (Pin 6), as specified in its Absolute Maximum Ratings table. This distinguishes it from the standard LTC1174CS8-3.3 (13.5 V max), enabling use with higher-voltage battery stacks or industrial rails. Exceeding 18.5 V risks permanent damage.
Does the LTC1174HVCS8-3.3#TRPBF require external feedback resistors to set the 3.3 V output?
No, the LTC1174HVCS8-3.3#TRPBF does not require external feedback resistors. It integrates a precision resistive divider that fixes the output to 3.30 V ±3% across temperature and load - confirmed in the Electrical Characteristics table under "VOUT Regulated Output Voltage" for LTC1174HV-3.3.
How does the low-battery detection function work on the LTC1174HVCS8-3.3#TRPBF?
The LTC1174HVCS8-3.3#TRPBF uses LBIN (Pin 3) as the inverting input of a comparator referenced to an internal 1.25 V bandgap. When the voltage at LBIN drops below this threshold - set by an external resistor divider from VIN - LBOUT (Pin 2) sinks up to 1.5 mA. The typical trip point is 1.25–1.4 V at LBIN, with 7.5–30 mV hysteresis to prevent oscillation.
Can the LTC1174HVCS8-3.3#TRPBF be used in inverting (negative output) configurations?
Yes, the LTC1174HVCS8-3.3#TRPBF can be configured as an inverting converter to generate –3.3 V, as documented in Typical Application TA07 of its datasheet. In this topology, the output is taken from the GND pin, and the maximum allowable VIN is reduced by the magnitude of the negative output (e.g., 13.5 V max for –3.3 V output) to stay within absolute maximum ratings.
What is the purpose of the IPGM pin on the LTC1174HVCS8-3.3#TRPBF?
The IPGM pin (Pin 7) on the LTC1174HVCS8-3.3#TRPBF selects the peak current limit of the internal P-channel MOSFET switch: tying IPGM to GND sets the limit to 340 mA (typ), while tying it to VIN raises it to 600 mA (typ). This allows designers to optimize inductor size and saturation margin for their specific load and transient requirements.
LTC1174HVCS8-3.3#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC1174HVCS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174HVCS8-3.3#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 LTC1174HVCS8-3.3#TRPBF reliable?
The price and inventory of LTC1174HVCS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174HVCS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1174HVCS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174HVCS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174HVCS8-3.3#TRPBF?
LTC1174HVCS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174HVCS8-3.3#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 LTC1174HVCS8-3.3#TRPBF?
For technical support, including LTC1174HVCS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174HVCS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1174HVCS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1174HVCS8-3.3#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 LTC1174HVCS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1174HVCS8-3.3#TRPBF?
All LTC1174HVCS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174HVCS8-3.3#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 LTC1174HVCS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1174HVCS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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