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Analog Devices Inc. LT1173CS8-12#TRPBF
- Part No.:
- LT1173CS8-12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1173CS8-12#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 12V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,744
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Product details
Overview
LT1173CS8-12#TRPBF from Analog Devices (formerly Linear Technology) is a micropower fixed-output 12V DC/DC converter IC operating in step-up, step-down, or inverting topologies. It features 110µA quiescent current, internal 1A power switch, 23kHz oscillator, and operates from 2.0V to 30V input. It delivers 12V at up to 50mA from 3V input in boost mode and is used in flash memory VPP generation and portable instrument power rails.
For engineers reviewing the LT1173CS8-12#TRPBF datasheet, LT1173CS8-12#TRPBF pinout, LT1173CS8-12#TRPBF application, or LT1173CS8-12#TRPBF equivalent, key selection criteria include fixed 12V output accuracy (±2.5%), programmable current limit via ILIM pin, low-battery detection capability using the auxiliary gain block, and compatibility with SO-8 package layout constraints for space-constrained designs.
Technical Context
The LT1173CS8-12#TRPBF implements a gated-oscillator architecture where switching occurs only when feedback voltage falls below the 1.245V internal reference, enabling ultra-low quiescent current. Its adaptive base drive ensures switch saturation without overdrive, improving efficiency across input ranges.
It supports three primary configurations: step-up (boost), step-down (buck), and inverting - each requiring distinct SW1/SW2 connections and external component selection. The fixed 12V version integrates internal resistor dividers on the FB/SENSE pin, eliminating external programming resistors required by the adjustable LT1173 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2.5% (ensures reliable VPP for flash memory programming) |
| Input Voltage Range | 2.0V–12.6V (boost), 3.0V–30V (buck); enables single-supply operation from batteries or industrial rails |
| Quiescent Current | 250µA typical in boost mode (minimizes standby drain in battery-powered systems) |
| Oscillator Frequency | 18–30kHz typ. 23kHz (low EMI, compatible with cost-effective axial inductors) |
| Switch Current Limit | Programmable up to 1.5A via ILIM pin resistor (prevents inductor saturation and switch overstress) |
| Operating Temperature | 0°C to 70°C (commercial-grade reliability for consumer and industrial portable equipment) |
| Package | 8-lead SOIC (SO-8); 5.0mm × 6.2mm footprint, surface-mount compatible |
Pinout & Package
LT1173CS8-12#TRPBF is housed in an 8-lead plastic SOIC (S8) package with standard SO-8 dimensions and lead pitch. Pin functions are validated per Linear Technology's official datasheet revision (DC2293F).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - ILIM | Current limit programming input | Resistor from ILIM to VIN sets peak switch current; open or tied to VIN for full 1.5A limit |
| 2 - VIN | Main power supply input | Accepts 2.0V–30V; powers internal circuitry and switch driver |
| 3 - SW1 | Power switch collector | In boost: connects to inductor/diode; in buck: connects to VIN |
| 4 - SW2 | Power switch emitter | In boost: connects to GND; in buck: connects to inductor/diode; must not fall below –0.5V |
| 5 - GND | Analog and power ground reference | Common return for feedback, gain block, and switch emitter |
| 6 - AO | Auxiliary gain block output | Open-collector NPN; sinks 100µA; used for low-battery detection or post-regulation |
| 7 - SET | Gain block non-inverting input | Connects to resistor divider for comparator trip point; bias current ≤100nA |
| 8 - FB/SENSE | Feedback input / fixed-voltage sense node | Internally connected to 12V divider; must connect directly to regulated 12V output |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 250µA typical supply current in 12V boost mode enables >1-year battery life in low-duty-cycle applications |
| Integrated 1A power switch | Eliminates external MOSFET; reduces BOM count and PCB area in compact converters |
| Three-mode topology support | Single IC replaces discrete boost/buck/inverter solutions-reducing design complexity and qualification effort |
| On-chip low-battery detector | Configurable gain block (SET/AO pins) provides system-level voltage monitoring without extra comparators |
| Programmable current limit | External resistor on ILIM pin allows precise control of peak switch current to match inductor saturation rating |
Applications
| Flash Memory VPP Generation | Portable Instrument Power Supply |
|---|---|
Use Scenario: Generating +12V programming voltage for NOR/NAND flash memory in handheld test equipment. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter providing stable, low-noise VPP during write/erase cycles. Use Value: Eliminates need for separate high-voltage charge pump IC; achieves 81% efficiency at 50mA load with minimal external components. | Use Scenario: Powering analog front-end circuitry (ADC, op-amps) in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Step-down regulator converting 9V alkaline stack to clean 5V or 12V rail for precision signal conditioning. Use Value: 250µA quiescent current extends battery life; programmable current limit prevents thermal shutdown during sensor excitation bursts. |
| Laptop Peripheral Card Power | Cellular Phone Baseband Supply |
Use Scenario: Providing isolated 12V bias for LCD contrast control or backlight drivers on PCMCIA/ExpressCard modules. IC Role / Device Role / Timing Role: Inverting or step-up converter delivering negative or boosted voltage from main 3.3V/5V system rail. Use Value: SO-8 package fits tight card-edge layouts; gated oscillator minimizes conducted EMI near RF sections. | Use Scenario: Generating 12V VPP for SIM card interface or RF power amplifier bias in GSM/CDMA handsets. IC Role / Device Role / Timing Role: Micropower boost converter operating from single Li-ion cell (3.0V–4.2V) to fixed 12V output. Use Value: 110–250µA quiescent current preserves standby time; internal switch eliminates gate-drive timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1173CN8-12 | DIP-8 package; higher θJA (130°C/W vs. 150°C/W); same electrical specs | Suitable for prototyping or through-hole assembly; less suitable for high-density SMT production | Select LT1173CN8-12 only if DIP footprint or manual soldering is required. |
| LT1111CS8-12 | 72kHz oscillator; smaller inductor/capacitor requirements; identical pinout and function | Better suited for size-constrained designs needing <5mm² solution area; higher switching loss at light loads | Choose LT1111CS8-12 when board space is critical and EMI filtering can accommodate higher frequency. |
Compared with LT1173CN8-12 and LT1111CS8-12, the LT1173CS8-12#TRPBF offers optimal balance of thermal performance (150°C/W SO-8), proven reliability in portable battery systems, and direct drop-in compatibility with existing SO-8 layouts-making it preferred for volume SMT manufacturing of space- and power-sensitive devices.
Availability
LT1173CS8-12#TRPBF is available at Aetrix Electronics and suitable for flash memory programming, portable instrumentation, laptop peripheral cards, cellular phone baseband supplies, and LCD bias generation requiring stable component supply and long-term manufacturability.
Supply support for LT1173CS8-12#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The LT1173 product line was developed by Linear Technology (acquired by ADI in 2017) to address ultra-low-power DC/DC conversion needs in battery-critical applications such as portable medical devices, handheld test gear, and memory subsystems.
FAQ
What is the output voltage tolerance of the LT1173CS8-12#TRPBF?
The LT1173CS8-12#TRPBF provides a fixed 12V output with guaranteed tolerance of ±2.5% over temperature and line conditions, corresponding to 11.4V to 12.6V. This specification is validated per the manufacturer's Electrical Characteristics table and applies across the full 0°C to 70°C operating range with proper layout and component selection.
Can the LT1173CS8-12#TRPBF operate in step-down (buck) mode?
Yes, the LT1173CS8-12#TRPBF supports step-down operation with input voltages up to 30V. In buck mode, SW1 connects to VIN and SW2 drives the inductor. Output voltage remains fixed at 12V, but efficiency and maximum output current depend on input voltage headroom and external component ratings-e.g., 12V output at 200mA is achievable from 12V input.
How is current limiting configured on the LT1173CS8-12#TRPBF?
Current limiting is set by connecting a resistor between the ILIM pin (Pin 1) and VIN. A 220Ω resistor limits peak switch current to ~400mA; values down to ~100Ω support up to the device's 1.5A maximum. The relationship is monotonic and documented in the "Maximum Switch Current vs RLIM" curve (TPC03/TPC09). No resistor (ILIM tied to VIN) enables full 1.5A capability.
Does the LT1173CS8-12#TRPBF require external feedback resistors?
No. Unlike the adjustable LT1173, the LT1173CS8-12#TRPBF integrates internal resistor dividers to set the 12V output. The FB/SENSE pin (Pin 8) must be connected directly to the regulated 12V output node-no external resistors are needed, simplifying layout and improving stability.
What is the recommended inductor for LT1173CS8-12#TRPBF in boost mode from 3V to 12V?
For 3V-to-12V boost operation delivering ≥50mA, a 47µH inductor with ≥300mA saturation current is recommended-e.g., Coiltronics CTX50-1 or Gowanda GA10-472K. These values are validated in Table 1 of the datasheet and ensure discontinuous conduction mode, low ripple, and 81% measured efficiency at full load.
LT1173CS8-12#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
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 23kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1173CS8-12#TRPBF FAQ
1.How can I place an order for LT1173CS8-12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1173CS8-12#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 LT1173CS8-12#TRPBF reliable?
The price and inventory of LT1173CS8-12#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1173CS8-12#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1173CS8-12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1173CS8-12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1173CS8-12#TRPBF?
LT1173CS8-12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1173CS8-12#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 LT1173CS8-12#TRPBF?
For technical support, including LT1173CS8-12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1173CS8-12#TRPBF requirements.
6.How does Aetrix verify that LT1173CS8-12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1173CS8-12#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 LT1173CS8-12#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1173CS8-12#TRPBF?
All LT1173CS8-12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1173CS8-12#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 LT1173CS8-12#TRPBF part is unused and in its original packaging.
Return procedure for LT1173CS8-12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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