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Analog Devices Inc. LT1173CN8-12#PBF
- Part No.:
- LT1173CN8-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1173CN8-12#PBF.pdf
- Description:
- IC REG BUCK BOOST 12V 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:133
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Product details
Overview
LT1173CN8-12#PBF from Analog Devices (formerly Linear Technology) is a fixed-output 12V micropower DC/DC converter in 8-pin MiniDIP package, operating from 2.0V to 30V input, delivering up to 200mA in step-down mode or 50mA in step-up mode, with 110µA quiescent current and internal 1.5A switch - used in battery-powered flash memory VPP generation and portable instrument power rails.
For engineers reviewing the LT1173CN8-12#PBF datasheet, LT1173CN8-12#PBF pinout, LT1173CN8-12#PBF application, or LT1173CN8-12#PBF equivalent, this page delivers verified pin functions, confirmed 12V fixed-output regulation tolerance (±5%), step-up/step-down topology support, thermal limits (0°C to 70°C), and real-world efficiency data (81% at 12V→5V/100mA).
Technical Context
The LT1173CN8-12#PBF implements a gated-oscillator architecture with adaptive base drive for NPN power switch control, enabling ultra-low 110µA standby current by disabling oscillator and high-current circuitry when feedback voltage exceeds 1.245V reference. Its internal resistor divider sets fixed 12V output via FB/SENSE pin connection to VOUT, eliminating external programming resistors.
Switch operation supports three topologies: step-up (SW1 drives inductor, SW2 grounded), step-down (SW1 tied to VIN, SW2 drives inductor), and inverting (SW2 referenced to negative rail). Current limit is user-programmable via ILIM-to-VIN resistor; default configuration ties ILIM to VIN for full 1.5A switch rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±5% (guaranteed over 0°C–70°C, 2.0V–30V input range) |
| Quiescent Current | 110µA (enables >1-year battery life in low-duty-cycle sensor nodes) |
| Input Voltage Range | 2.0V–12.6V (step-up), 2.0V–30V (step-down); supports single-cell Li-ion to 24V industrial rails |
| Max Switch Current | 1.5A (supports peak loads without external current-sense components) |
| Oscillator Frequency | 18–30kHz (low EMI, compatible with cost-effective axial inductors) |
| Efficiency | 81% at 12V→5V/100mA (measured with 1N5818 diode and OS-CON capacitor) |
| Operating Temp | 0°C to 70°C (commercial-grade thermal envelope for handheld devices) |
Pinout & Package
LT1173CN8-12#PBF uses an 8-lead plastic DIP (N8) package with 0.3-inch width, JEDEC MS-001 compliant, through-hole mountable, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit programming input | Connect to VIN for full 1.5A switch rating; add resistor to reduce peak current (e.g., 220Ω → ~400mA) |
| VIN (Pin 2) | Main power supply input | Accepts 2.0V–30V; supplies internal reference, oscillator, and driver circuits |
| SW1 (Pin 3) | Power switch collector | In step-up: connects to inductor/diode; in step-down: ties directly to VIN |
| SW2 (Pin 4) | Power switch emitter | In step-up: connects to GND; in step-down: drives inductor; must not fall below –0.5V |
| GND (Pin 5) | Analog and power ground | Common return for reference, comparator, and switch emitter |
| AO (Pin 6) | Auxiliary gain block open-collector output | Sinks 100µA; configurable as low-battery detector or UVLO signal |
| SET (Pin 7) | Gain block non-inverting input | Internally biased to 1.245V reference; used with resistor divider for trip-point setting |
| FB/SENSE (Pin 8) | Feedback input / fixed-output sense node | On LT1173CN8-12#PBF: connects directly to VOUT; internal resistor network sets 12V regulation point |
Key Features
| Feature | Design Value |
|---|---|
| Three-component operation | Only inductor, diode, and output capacitor required for functional 12V regulator - reduces BOM count and layout area |
| Programmable current limit | Single external resistor on ILIM pin enables precise peak switch current control (400mA to 1.5A), preventing inductor saturation and switch overstress |
| Low-battery detection | Integrated auxiliary gain block (AO/SET pins) provides comparator output with <10mV hysteresis - eliminates need for external supervisor IC |
| Topology flexibility | Same IC supports step-up, step-down, and inverting configurations via pin reconnection - simplifies design reuse across voltage rail requirements |
| Fixed 12V output | On-chip resistor divider eliminates external feedback network - ensures production consistency and reduces calibration risk |
Applications
| Flash Memory VPP Generation | Portable Instrument Power |
|---|---|
Use Scenario: Generating +12V programming voltage for NOR/NAND flash memory in embedded data loggers with single 3.3V or 5V supply. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter providing regulated VPP during write/erase cycles; gated oscillator minimizes standby drain between operations. Use Value: Eliminates need for external charge pump or transformer-based solution - reduces size, cost, and EMI in space-constrained PCBs. | Use Scenario: Powering analog front-end (AFE) and microcontroller in handheld multimeters powered by two AA cells (2.0–3.2V). IC Role / Device Role / Timing Role: Step-up converter generating stable 12V rail for op-amp biasing and LCD contrast control from diminishing battery voltage. Use Value: 110µA quiescent current extends battery life beyond 500 hours of active use; 81% efficiency maintains runtime under load. |
| Laptop Peripheral Cards | Battery Backup Supplies |
Use Scenario: Providing isolated 12V for PC Card (PCMCIA) interface logic and level-shifting in legacy laptop expansion slots. IC Role / Device Role / Timing Role: Compact step-up regulator delivering 12V at 50mA from 5V system rail; operates within tight thermal envelope of card-edge connector. Use Value: 8-pin DIP footprint allows direct replacement of older discrete solutions; no external compensation required. | Use Scenario: Maintaining real-time clock (RTC) and SRAM backup during main power failure in industrial controllers using supercapacitor or lithium coin cell. IC Role / Device Role / Timing Role: Low-quiescent-current step-down converter regulating 12V backup source to 5V/3.3V for critical memory retention. Use Value: Sub-150µA total supply current enables >3-month hold-up time with 0.1F supercapacitor charged to 12V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1173CS8-12#PBF | Same electrical specs; SO-8 surface-mount package (θJA = 150°C/W vs. 130°C/W for DIP) | Preferred for automated assembly and space-constrained layouts; requires reflow-compatible board design | Select when volume production, smaller footprint, or thermal management via PCB copper pour is prioritized. |
| LT1073CN8-12#PBF | Lower minimum input (1.0V vs. 2.0V); 72kHz oscillator; 70% duty cycle; max 1.2A switch current | Better suited for single-cell alkaline or NiMH systems below 2V; higher frequency enables smaller magnetics | Choose when input drops below 2.0V or inductor size reduction is critical; accept higher quiescent current (130µA vs. 110µA). |
Compared with LT1173CS8-12#PBF, the LT1173CN8-12#PBF offers superior thermal resistance for through-hole prototyping and lower-cost manual assembly; versus LT1073CN8-12#PBF, it provides lower quiescent current and wider input range above 2V, making it optimal for stable 3V+ battery or adapter-fed systems.
Availability
LT1173CN8-12#PBF is available at Aetrix Electronics and suitable for flash memory programming, portable instrumentation, laptop peripheral cards, and battery backup supplies requiring stable component supply, long-lifecycle support, and commercial-temperature performance.
Supply support for LT1173CN8-12#PBF 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 its precision analog and power management portfolio with rigorous qualification and long-term product support.
The LT1173 family was designed for ultra-low-power DC/DC conversion in battery-critical applications - emphasizing micropower operation, topology flexibility, and minimal external component count for portable and embedded systems.
FAQ
What is the guaranteed output voltage tolerance for LT1173CN8-12#PBF?
The LT1173CN8-12#PBF guarantees a fixed 12V output within ±5% (11.4V to 12.6V) across full temperature range (0°C to 70°C) and input voltage range (2.0V to 30V), as specified in the Electrical Characteristics table under "VOUT LT1173-12" parameter. This tolerance is achieved via laser-trimmed internal resistor dividers, eliminating external component drift effects.
Can LT1173CN8-12#PBF operate in step-down mode from a 24V input?
Yes, LT1173CN8-12#PBF supports step-down operation from inputs up to 30V. When configured with SW1 tied to VIN and SW2 driving the inductor, it delivers 12V at up to 200mA from 24V input. Efficiency remains >75% with proper inductor selection (e.g., 220µH) and Schottky diode (1N5818), and current limiting via ILIM resistor is recommended to prevent switch overstress.
Does LT1173CN8-12#PBF require external feedback resistors?
No, LT1173CN8-12#PBF does not require external feedback resistors. It integrates precision on-chip resistors that set the 12V output; Pin 8 (FB/SENSE) must be connected directly to the output node. This differs from the adjustable LT1173 variant, which requires external R1/R2 to program VOUT - eliminating calibration uncertainty and saving board space.
What is the maximum allowable voltage on the SW2 pin of LT1173CN8-12#PBF?
The absolute maximum voltage on SW2 is –0.5V relative to GND. During step-down operation, SW2 swings below ground due to inductive kickback; exceeding –0.5V risks destructive power dissipation. A Schottky diode (e.g., 1N5818) must be used to clamp SW2, as silicon diodes like 1N4933 allow –0.8V excursion and are incompatible with LT1173CN8-12#PBF.
How does the ILIM pin function on LT1173CN8-12#PBF?
The ILIM pin on LT1173CN8-12#PBF programs peak switch current by sensing a fraction of the main switch current. Connecting a resistor between ILIM and VIN sets the trip point (e.g., 220Ω → ~400mA); leaving ILIM tied directly to VIN enables full 1.5A rating. This prevents inductor saturation and switch failure under variable input conditions, and is fully supported in both step-up and step-down modes.
LT1173CN8-12#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1173CN8-12#PBF FAQ
1.How can I place an order for LT1173CN8-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1173CN8-12#PBF 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 LT1173CN8-12#PBF reliable?
The price and inventory of LT1173CN8-12#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1173CN8-12#PBF is usually 5 days.
3.What payment methods are accepted for LT1173CN8-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1173CN8-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1173CN8-12#PBF?
LT1173CN8-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1173CN8-12#PBF 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 LT1173CN8-12#PBF?
For technical support, including LT1173CN8-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1173CN8-12#PBF requirements.
6.How does Aetrix verify that LT1173CN8-12#PBF is sourced from the original manufacturer or authorized distributors?
All LT1173CN8-12#PBF 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 LT1173CN8-12#PBF meets industry standards.
7.What is the process for return or replacement of LT1173CN8-12#PBF?
All LT1173CN8-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1173CN8-12#PBF, 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 LT1173CN8-12#PBF part is unused and in its original packaging.
Return procedure for LT1173CN8-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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