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Analog Devices Inc. LTC1174CS8-3.3#TRPBF
- Part No.:
- LTC1174CS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174CS8-3.3#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 3.3V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,952
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Product details
Overview
LTC1174CS8-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-output, high-efficiency step-down DC/DC converter IC with integrated 0.9Ω P-channel MOSFET switch, optimized for 5V-to-3.3V conversion in battery-powered systems. It delivers up to 175mA output current, achieves 94% peak efficiency at 9V input, features pin-selectable 340mA/600mA current limit, and includes low-battery detection with 1.25V threshold.
For engineers reviewing the LTC1174CS8-3.3#TRPBF datasheet, LTC1174CS8-3.3#TRPBF pinout, LTC1174CS8-3.3#TRPBF application, or LTC1174CS8-3.3#TRPBF equivalent, key selection considerations include its 3.3V ±4.7% regulated output, 4V–18.5V input range, 130µA standby current, micropower shutdown (1µA), and SO-8 package compatibility with space-constrained portable designs.
Technical Context
The LTC1174CS8-3.3#TRPBF employs a constant off-time current-mode architecture with internal 1.25V reference and fixed resistive feedback divider, enabling stable regulation without external compensation. Its switching frequency varies with input-output voltage differential-e.g., ~111kHz at VIN=9V/VOUT=3.3V-and it automatically transitions between continuous conduction mode and Burst Mode® to maintain high light-load efficiency.
Control logic integrates a low-battery comparator (LBIN/LBOUT pins), programmable current limit via IPGM pin, and active-low micropower shutdown. The internal P-channel switch operates in low-dropout mode when VIN approaches VOUT, extending battery life by maintaining regulation down to VIN ≈ VOUT + 0.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.30V ±4.7% (3.14V–3.46V); factory-trimmed fixed output eliminates external resistor network. |
| Input Voltage Range | 4V to 18.5V; supports wide battery chemistries including 4×NiCd (4.8V) and Li-ion (up to 18.5V with HV variant). |
| Max Output Current | 175mA at 3.3V (with 100µH inductor, IPGM=0V); scalable to 400mA with IPGM=VIN and appropriate layout. |
| Peak Efficiency | 94% at VIN=9V, IOUT=300mA, L=100µH; enables minimal thermal rise in sealed enclosures. |
| Quiescent Current | 130µA in sleep mode; reduces no-load power loss in always-on instrumentation. |
| Shutdown Current | 1µA typical; critical for long-term battery backup in memory retention applications. |
| Switch RDS(ON) | 0.75Ω–1.30Ω (typical 0.9Ω @ VIN=9V); defines conduction loss and thermal dissipation under load. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), surface-mount, RoHS-compliant, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output / feedback node | Fixed 3.3V output terminal; internally connected to precision resistive divider-no external resistor required. |
| LBOUT (Pin 2) | Low-battery indicator open-drain output | Sinks up to 1.2mA when LBIN < 1.25V; drives LED or microcontroller interrupt with 7.5mV hysteresis. |
| LBIN (Pin 3) | Low-battery comparator inverting input | Accepts external resistive divider from VIN; trip point set at 1.25V reference-configurable for 4.4V–5.5V thresholds. |
| GND (Pin 4) | Power and signal ground reference | Common return for switch, feedback, and comparator circuits; must be low-impedance connection to minimize noise coupling. |
| SW (Pin 5) | Switch node (drain of internal P-MOSFET) | Connects directly to cathode of external Schottky catch diode; high dv/dt node requiring tight layout to GND. |
| VIN (Pin 6) | Main input supply | Accepts 4V–18.5V; requires local 0.1µF ceramic + bulk electrolytic decoupling to handle RMS input ripple current. |
| IPGM (Pin 7) | Current limit programming input | Logic-level select: 0V = 340mA limit, VIN = 600mA limit; sets peak inductor current independent of L value. |
| SHUTDOWN (Pin 8) | Active-low enable control | Pull ≤0.75V to disable regulator and reduce supply current to 1µA; high-impedance input requires pull-up during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency conversion | 94% peak efficiency enables >1000-hour runtime on two AA alkaline cells powering 3.3V microcontrollers. |
| Pin-selectable current limit | 340mA/600mA options allow optimization for either compact inductor size or higher output capability without redesign. |
| Integrated low-battery detector | Dedicated LBIN/LBOUT pins simplify state-of-charge monitoring without external comparators or ADC resources. |
| Micropower shutdown | 1µA shutdown current preserves battery capacity during storage or system sleep modes in portable medical devices. |
| Only four external components | Requires only inductor, Schottky diode, input capacitor, and output capacitor-reducing BOM count and PCB area vs. controller-based solutions. |
Applications
| Portable Instruments | Battery-Powered Equipment |
|---|---|
Use Scenario: Handheld multimeter operating from two AA alkaline cells (1.5V–3.0V per cell) with LCD display and microcontroller. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator stepping down 3V–4.5V input to stable 3.3V for MCU, ADC, and display driver. Use Value: 94% efficiency extends battery life to >200 hours; low 130µA sleep current prevents drain during auto-off periods. | Use Scenario: Wireless sensor node powered by single Li-ion cell (3.0V–4.2V) transmitting temperature data via BLE. IC Role / Device Role / Timing Role: Step-down regulator supplying 3.3V to RF transceiver and ultra-low-power MCU during active transmission bursts. Use Value: Pin-selectable 600mA current limit supports 400mA peak transmit current; Burst Mode® maintains 85%+ efficiency at 10µA load. |
| Memory Backup Supply | Industrial Control Modules |
Use Scenario: Industrial PLC module retaining SRAM and real-time clock during main power interruption using supercapacitor backup. IC Role / Device Role / Timing Role: Low-noise 3.3V regulator sourcing memory backup current from charged supercapacitor (2.5V–5.5V). Use Value: 1µA shutdown current minimizes capacitor self-discharge; low dropout operation sustains regulation until capacitor drops to ~3.4V. | Use Scenario: DIN-rail mounted I/O module powered from 24VDC industrial bus, requiring isolated 3.3V for digital logic and communication interfaces. IC Role / Device Role / Timing Role: Pre-regulator stage reducing 24V to 5V or 3.3V before LDO post-regulation for noise-sensitive analog circuitry. Use Value: Wide 4V–18.5V input range accommodates brownout conditions; short-circuit protection prevents latch-up during field wiring faults. |
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 |
|---|---|---|---|
| TPS62231DRYR | 3MHz synchronous buck; 0.65V–6.5V input; 3.3V ±1%; 300mA output; 17µA quiescent current. | Higher frequency enables smaller inductors/capacitors but lacks integrated low-battery detector and requires external feedback resistors. | Preferred for space-constrained designs needing higher output current and lower IQ, where LB detection is handled externally. |
| MAX17222ETA+ | 1.8V–5.5V input; 3.3V ±2%; 500mA output; 0.9µA shutdown; integrated soft-start; no LB detection. | Optimized for single-cell Li-ion or coin-cell inputs; lacks wide-input flexibility and dedicated battery monitoring pins. | Best for ultra-low-power wearable devices with sub-5V sources where footprint and shutdown current are primary constraints. |
Compared with TPS62231DRYR and MAX17222ETA+, the LTC1174CS8-3.3#TRPBF uniquely combines wide-input operation, integrated low-battery signaling, and minimal external component count-making it optimal for legacy battery-powered industrial instruments where reliability and design simplicity outweigh ultra-miniaturization needs.
Availability
LTC1174CS8-3.3#TRPBF is available at Aetrix Electronics and suitable for portable instruments, battery-powered equipment, memory backup supplies, and industrial control modules requiring stable component supply across extended production lifecycles.
Supply support for LTC1174CS8-3.3#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 LTC1174 family was designed specifically for cost-sensitive, low-to-moderate power DC/DC conversion in battery-operated systems where simplicity, reliability, and integrated protection features outweigh the need for synchronous rectification or digital control.
FAQ
What is the guaranteed output voltage tolerance for LTC1174CS8-3.3#TRPBF?
The LTC1174CS8-3.3#TRPBF guarantees a regulated output voltage of 3.30V with a total tolerance of ±4.7% (3.14V to 3.46V) across the full operating temperature range (0°C to 70°C) and input voltage range (4V to 18.5V). This specification is verified per the manufacturer's electrical characteristics table and applies regardless of load current within rated limits.
Can LTC1174CS8-3.3#TRPBF operate from a single Li-ion cell?
Yes, the LTC1174CS8-3.3#TRPBF can operate from a single Li-ion cell (2.7V–4.2V nominal) when used in low-dropout mode, though its minimum specified input is 4V. At VIN = 3.6V, regulation is maintained down to VOUT + ~0.5V due to the P-channel MOSFET architecture-enabling functional 3.3V output until the cell discharges below ~3.8V. For robust single-cell operation, the LTC1174HVCS8-3.3#TRPBF variant (4V–18.5V range) is recommended.
How does the IPGM pin affect current limiting in LTC1174CS8-3.3#TRPBF?
The IPGM pin on the LTC1174CS8-3.3#TRPBF selects between two factory-trimmed peak current limits: 340mA when IPGM = 0V, and 600mA when IPGM = VIN. This setting directly determines the maximum inductor current before cycle-by-cycle current limiting activates, allowing designers to optimize for either smaller magnetics (lower current) or higher output capability (higher current) without changing the IC.
Does LTC1174CS8-3.3#TRPBF require an external feedback resistor network?
No, the LTC1174CS8-3.3#TRPBF does not require external feedback resistors. It integrates a precision resistive divider that sets the output to 3.3V internally-unlike the adjustable LTC1174 version, which uses Pin 1 (VFB) as a feedback input. This simplifies design, improves accuracy, and eliminates resistor tolerance errors and layout sensitivity associated with external dividers.
What is the purpose of the LBIN and LBOUT pins on LTC1174CS8-3.3#TRPBF?
The LBIN (Pin 3) and LBOUT (Pin 2) pins implement a dedicated low-battery detection function on the LTC1174CS8-3.3#TRPBF. LBIN accepts a resistive divider from VIN to compare against an internal 1.25V reference; when the divided voltage falls below this threshold, LBOUT sinks up to 1.2mA to signal low battery condition-enabling direct LED drive or microcontroller interrupt without additional components.
LTC1174CS8-3.3#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):
- 13.5V
- 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
LTC1174CS8-3.3#TRPBF FAQ
1.How can I place an order for LTC1174CS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174CS8-3.3#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 LTC1174CS8-3.3#TRPBF reliable?
The price and inventory of LTC1174CS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174CS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1174CS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174CS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174CS8-3.3#TRPBF?
LTC1174CS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174CS8-3.3#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 LTC1174CS8-3.3#TRPBF?
For technical support, including LTC1174CS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174CS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1174CS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1174CS8-3.3#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 LTC1174CS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1174CS8-3.3#TRPBF?
All LTC1174CS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174CS8-3.3#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 LTC1174CS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1174CS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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