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Analog Devices Inc. LTC1174CS8-5#TRPBF
- Part No.:
- LTC1174CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1174CS8-5#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 5V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,007
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Product details
Overview
LTC1174CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-output, high-efficiency step-down DC/DC converter IC optimized for 5V output from 4V–18.5V input. It integrates a 0.9Ω P-channel MOSFET switch, supports pin-selectable 340mA/600mA current limit, delivers up to 94% efficiency at 300mA load, and features low-battery detection, micropower shutdown (1µA), and Burst Mode® operation for light-load efficiency. It is widely used in portable instruments and battery-powered equipment requiring stable 5V rail generation.
For engineers reviewing the LTC1174CS8-5#TRPBF datasheet, LTC1174CS8-5#TRPBF pinout, LTC1174CS8-5#TRPBF application, or LTC1174CS8-5#TRPBF equivalent, key selection criteria include its fixed 5V output, SO-8 package, 130µA standby current, internal current-sense architecture, and compatibility with standard Schottky catch diodes such as MBRS140T3 or 1N5818.
Technical Context
The LTC1174CS8-5#TRPBF employs a constant off-time current-mode control architecture with an internal 1.25V reference and integrated P-channel power switch. Its operating frequency varies with input–output voltage differential (e.g., ~111kHz at VIN=9V, VOUT=5V), and it automatically transitions between continuous conduction mode and Burst Mode® to maintain high efficiency across load ranges from 20mA to 400mA.
It implements short-circuit protection via pin-selectable peak current limiting (340mA at IPGM = 0V; 600mA at IPGM = VIN), includes a dedicated low-battery comparator (trip point 1.25V on LBIN), and uses external resistive dividers only for adjustable versions - the LTC1174CS8-5#TRPBF has factory-trimmed internal feedback for precise 5.00V ±2.5% regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±2.5% (guaranteed over full temperature range) |
| Input Voltage Range | 4V to 18.5V (supports 4×NiCd, 9V battery, or wide-input industrial rails) |
| Peak Efficiency | Up to 94% at 300mA load, VIN=9V, L=100µH, IPGM=VIN |
| Quiescent Current | 130µA in sleep mode; 1µA in active-low shutdown |
| Current Limit | PIN-selectable: 340mA (IPGM = 0V) or 600mA (IPGM = VIN) |
| Switch RDS(ON) | 0.75Ω (typ) at VIN=9V - enables high efficiency without external FET |
| Operating Frequency | ~42–200kHz depending on VIN–VOUT; no external timing component required |
Pinout & Package
Package: 8-lead plastic SO (SO-8), RoHS-compliant, lead-free (#PBF), tape-and-reel (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output / feedback node | Internal resistive divider sets fixed 5V; connects to output capacitor and load |
| LBOUT (Pin 2) | Low-battery indicator open-drain output | Sinks up to 1.2mA when LBIN < 1.25V; requires pull-up for LED/alert signaling |
| LBIN (Pin 3) | Low-battery comparator inverting input | Monitors input voltage via external resistor divider; trip threshold = 1.25V |
| GND (Pin 4) | Power and signal ground reference | Return path for switch, feedback, and comparator circuits; must be low-impedance |
| SW (Pin 5) | Switch node (drain of internal P-MOSFET) | Connects directly to cathode of Schottky catch diode and inductor; high dI/dt node |
| VIN (Pin 6) | Main input supply connection | Accepts 4–18.5V; requires local 0.1µF ceramic + bulk electrolytic decoupling |
| IPGM (Pin 7) | Current limit programming input | Logic-level select: 0V → 340mA limit; VIN → 600mA limit; must not float |
| SHUTDOWN (Pin 8) | Enable/disable control input | Active-low; <0.75V = shutdown (1µA IQ); >1.2V = active; high-impedance, requires pull-up |
Key Features
| Feature | Design Value |
|---|---|
| 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 optimization of inductor size and thermal performance for 340mA or 600mA max output |
| Integrated 0.9Ω P-MOSFET switch | Eliminates need for external high-side switch; reduces BOM count and layout complexity |
| Only four external components required | Inductor, Schottky diode, input/output capacitors - minimal bill-of-materials for complete 5V supply |
| Low-battery detector with hysteresis | 1.25V threshold with 7.5–30mV hysteresis prevents chatter during battery sag; LBOUT drives LEDs or MCU interrupts |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Compact wearable sensor node powered by two AA alkaline cells (2.4–3.2V) stepped up to 5V for microcontroller and analog front-end. IC Role / Device Role / Timing Role: Primary 5V power regulator; provides regulated rail for ADC, op-amps, and BLE radio during intermittent wake cycles. Use Value: 130µA sleep current extends battery life beyond 12 months; Burst Mode® ensures stable 5V even at µA-level sensor bias currents. | Use Scenario: Industrial environmental monitor using Li-ion (3.0–4.2V) or 9V battery, logging temperature/humidity every 10 minutes. IC Role / Device Role / Timing Role: Main system power supply; powers MCU, flash memory, and serial interface during brief active periods. Use Value: Pin-selectable 600mA current limit supports fast flash writes; low-dropout behavior preserves runtime as battery discharges to 4V. |
| Handheld Test Equipment | Memory Backup Supply |
Use Scenario: Pocket-sized multimeter with LCD display, analog measurement circuitry, and USB charging input. IC Role / Device Role / Timing Role: Generates clean 5V rail from variable input (USB 5V or battery 6–9V) for display driver and precision references. Use Value: 94% peak efficiency minimizes heat in sealed enclosure; internal switch eliminates external FET footprint and gate-drive complexity. | Use Scenario: SRAM backup in embedded controller where main 5V rail may fail during brownout or power interruption. IC Role / Device Role / Timing Role: Standby power source that activates when main supply drops below 4.75V, sustaining SRAM contents. Use Value: Low-battery detector (LBIN/LBOUT) triggers controlled save-to-flash before backup engages; 1µA shutdown current prevents battery drain during long-term storage. |
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 |
|---|---|---|---|
| LT1931ES5#TRMPBF | Fixed 5V output, 1.2MHz constant-frequency PWM, higher quiescent current (1.1mA), no Burst Mode® | Better EMI control due to fixed frequency; less suitable for ultra-low-power sleep modes | Select when predictable switching frequency and lower output ripple are prioritized over standby current |
| TPS62231DRYR | 3MHz synchronous buck, 95% efficiency, 22µA quiescent current, but requires external compensation and lacks low-battery detection | No integrated battery monitoring; designed for high-density portable apps with tight PCB area constraints | Select when board space is critical and low-battery alert functionality is handled externally |
Compared with LT1931ES5#TRMPBF and TPS62231DRYR, the LTC1174CS8-5#TRPBF uniquely combines micropower Burst Mode®, integrated low-battery detection, and minimal external component count - making it optimal for cost-sensitive, battery-life-critical applications where simplicity and ultra-low IQ outweigh fixed-frequency EMI requirements.
Availability
LTC1174CS8-5#TRPBF is available at Aetrix Electronics and suitable for portable instruments, battery-powered equipment, and memory backup supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1174CS8-5#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC1174 family was designed specifically for high-efficiency, low-component-count DC/DC conversion in space- and power-constrained portable systems - emphasizing simplicity, reliability, and extended battery runtime without external controllers or complex compensation.
FAQ
What is the guaranteed output voltage tolerance for LTC1174CS8-5#TRPBF over temperature?
The LTC1174CS8-5#TRPBF guarantees a regulated output voltage of 4.75V to 5.25V (±2.5%) across its full operating temperature range (0°C to 70°C for the 'C' grade). This specification is explicitly confirmed in the Electrical Characteristics table under "VOUT Regulated Output Voltage" for LTC1174-5, with the ● symbol indicating full-temperature-range applicability.
Can LTC1174CS8-5#TRPBF operate from a 3.6V lithium-ion cell?
No - the absolute minimum input voltage for LTC1174CS8-5#TRPBF is 4V per the Absolute Maximum Ratings and Typical Performance Characteristics. A 3.6V Li-ion cell falls below this threshold and will not enable regulation. For single-cell Li-ion (2.7–4.2V), consider the LTC1174HVCS8-5#TRPBF variant, which supports 4V–18.5V input and is explicitly rated for wider VIN range.
How does the IPGM pin affect inductor selection for LTC1174CS8-5#TRPBF?
The IPGM pin sets peak switch current (340mA or 600mA), directly determining minimum inductance value to avoid saturation. At 600mA limit, a 50µH inductor (e.g., Coiltronics CTX50-4) suffices for 350mA loads; at 340mA, a 100µH unit (CTX100-4) is recommended to maintain continuous conduction and reduce ripple. Inductor RMS current rating must exceed IPEAK/√2.
Is LTC1174CS8-5#TRPBF suitable for negative output (inverting) configurations?
Yes - though LTC1174CS8-5#TRPBF is optimized for positive step-down, its architecture supports inverting topologies. Figure 5 in the datasheet shows LTC1174HV-5 generating –5V; for LTC1174CS8-5#TRPBF, use VIN ≥ 6V and ensure SW-to-GND voltage remains within –0.3V to VIN–13.5V limits. Output current capability is reduced due to duty-cycle constraints.
What is the purpose of the LBIN and LBOUT pins on LTC1174CS8-5#TRPBF?
LBIN (Pin 3) is the inverting input of an internal comparator referenced to 1.25V; connecting it to a resistor divider from VIN allows programmable low-battery detection. LBOUT (Pin 2) is an open-drain N-channel output that sinks up to 1.2mA when LBIN voltage drops below 1.25V - enabling direct LED drive or MCU interrupt signaling without additional transistors.
LTC1174CS8-5#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):
- 5V
- 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
LTC1174CS8-5#TRPBF FAQ
1.How can I place an order for LTC1174CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1174CS8-5#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 LTC1174CS8-5#TRPBF reliable?
The price and inventory of LTC1174CS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1174CS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1174CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1174CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1174CS8-5#TRPBF?
LTC1174CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1174CS8-5#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 LTC1174CS8-5#TRPBF?
For technical support, including LTC1174CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1174CS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC1174CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1174CS8-5#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 LTC1174CS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1174CS8-5#TRPBF?
All LTC1174CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1174CS8-5#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 LTC1174CS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1174CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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