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Analog Devices Inc. LT1173CS8#TRPBF
- Part No.:
- LT1173CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1173CS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,310
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Product details
Overview
LT1173CS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower DC/DC converter IC capable of step-up, step-down, and inverting operation with internal 1A power switch, 110µA quiescent current, and 2.0V–30V input range. It delivers fixed 5V or 12V output (this variant is adjustable), supports programmable current limit via ILIM pin, and targets battery-powered portable systems requiring high efficiency at light loads.
For engineers reviewing the LT1173CS8#TRPBF datasheet, LT1173CS8#TRPBF pinout, LT1173CS8#TRPBF application, or LT1173CS8#TRPBF equivalent, key selection criteria include its gated-oscillator architecture for ultra-low IQ, dual-mode topology flexibility, on-chip low-battery comparator, and SO-8 package compatibility with space-constrained designs.
Technical Context
The LT1173CS8#TRPBF implements a gated oscillator control scheme where switching occurs only when feedback voltage falls below the 1.245V internal reference, enabling 110µA standby current. Its adaptive base drive ensures switch saturation without overdrive, optimizing efficiency across load and input voltage ranges.
It integrates a versatile auxiliary gain block (AO/SET pins) configurable as low-battery detector, linear post-regulator, or error amplifier, and features user-programmable current limiting via external resistor on ILIM pin - critical for inductor protection in variable-input applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 110 µA at switch-off - enables multi-year battery life in always-on sensor nodes |
| Input Voltage Range | 2.0 V to 30 V - supports single-cell Li-ion up to 24 V industrial rails |
| Oscillator Frequency | 18–30 kHz typical - balances EMI control and inductor size for portable designs |
| Max Switch Current | 1.5 A - allows robust power delivery with external current limiting |
| Output Voltage Mode | Adjustable (via FB pin) - enables custom regulation points using resistor divider |
| Operating Temp | 0°C to 70°C - suitable for commercial and industrial ambient environments |
| Package | 8-lead SOIC (SO-8) - surface-mount compatible with standard reflow profiles |
Pinout & Package
LT1173CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC footprint, thermal resistance θJA = 150°C/W, and rated for 90°C maximum junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit programming input | Connect resistor to VIN to set precise switch current threshold; tie directly to VIN for full 1.5A capability |
| VIN (Pin 2) | Main power supply input | Accepts 2.0–30 V; powers internal circuitry and switch driver |
| SW1 (Pin 3) | Power switch collector | In boost mode: drives inductor/diode; in buck mode: connects to input rail |
| SW2 (Pin 4) | Power switch emitter | In boost mode: grounded; in buck mode: drives inductor; must not fall below –0.5 V |
| GND (Pin 5) | Analog and power ground | Common reference for feedback, gain block, and oscillator; requires low-impedance PCB connection |
| AO (Pin 6) | Auxiliary gain block open-collector output | Sinks up to 100 µA; used for low-battery flag, UVLO, or error signal conditioning |
| SET (Pin 7) | Gain block non-inverting input | Accepts voltage divider from VIN for comparator trip point setting; bias current ≤100 nA |
| FB/SENSE (Pin 8) | Feedback input / output voltage sense | Compares against 1.245 V reference; determines regulated output in adjustable configuration |
Key Features
| Feature | Design Value |
|---|---|
| Gated oscillator architecture | Switching disabled between regulation cycles - reduces IQ to 110 µA without compromising transient response |
| Triple topology support | Single IC supports boost, buck, and inverting configurations - eliminates need for multiple part numbers in multi-rail designs |
| Programmable current limit | External resistor on ILIM pin sets switch cutoff current - prevents inductor saturation and switch overstress across wide VIN ranges |
| Integrated low-battery comparator | On-chip 1.245 V reference and comparator enable battery monitoring without external components |
| Adjustable output voltage | Resistor divider on FB pin sets output from ~2 V to >VIN - supports custom logic supply or analog bias rails |
Applications
| Portable Medical Sensors | Laptop Peripheral Cards |
|---|---|
Use Scenario: Powering low-power glucose monitors or pulse oximeters from single 3V coin cell. IC Role / Device Role / Timing Role: Step-up DC/DC converter generating stable 5V rail for microcontroller and sensor interface. Use Value: 110µA quiescent current extends battery life beyond 2 years; adjustable output supports varying sensor voltage requirements. | Use Scenario: Providing isolated 5V or 12V supply for USB or PCIe add-on cards in ultrabooks. IC Role / Device Role / Timing Role: Compact, efficient voltage translator interfacing host 3.3V/12V rails with peripheral logic. Use Value: SO-8 package fits tight board real estate; 81% measured efficiency at 80mA reduces thermal load in confined enclosures. |
| Flash Memory VPP Generators | Industrial Handheld Terminals |
Use Scenario: Generating +12V programming voltage for legacy NOR/NAND flash memory during firmware updates. IC Role / Device Role / Timing Role: Adjustable boost converter delivering precise, low-noise VPP with fast transient recovery. Use Value: Programmable current limit protects flash cells during write cycles; 12V output accuracy ±2.5% ensures reliable programming margin. | Use Scenario: Powering barcode scanners and RFID readers in ruggedized handheld terminals operating from 7.2–12V battery packs. IC Role / Device Role / Timing Role: Step-down regulator converting 12V battery to clean 5V for MCU and communication ICs. Use Value: Wide 2.0–30V input range accommodates battery discharge curve; integrated gain block enables battery voltage monitoring and low-power shutdown. |
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 |
|---|---|---|---|
| LT1073CN8#PBF | Lower minimum input (1.2V), 70% duty cycle, higher IQ (150µA) | Better suited for sub-2V primary cells; less efficient above 5V input | Select when powering from single alkaline or NiMH cells below 2V |
| MAX761CSA+ | Fixed 5V output only, 100µA IQ, 300kHz switching | No adjustable output or topology flexibility; smaller external components | Choose for cost-sensitive, fixed-output applications where layout area is critical |
Compared with LT1173CS8#TRPBF, LT1073CN8#PBF offers deeper under-voltage operation but sacrifices efficiency above 3V input, while MAX761CSA+ trades configurability for higher frequency and lower BOM count - making LT1173CS8#TRPBF optimal for multi-topology, battery-life-critical designs.
Availability
LT1173CS8#TRPBF is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld terminals, flash memory programming circuits, and battery-backed instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for LT1173CS8#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 LT1173CS8#TRPBF belongs to Linear's legacy micropower DC/DC converter family, designed specifically for ultra-low-quiescent-current power conversion in battery-operated portable and remote sensing equipment.
FAQ
What is the maximum output current capability of the LT1173CS8#TRPBF in step-up mode?
The LT1173CS8#TRPBF can deliver up to 80mA at 5V from a 3V input in step-up mode, as confirmed by the datasheet's typical performance characteristics. Actual output current depends on input voltage, inductor selection, diode forward drop, and thermal conditions. The internal 1.5A switch and programmable current limit allow careful optimization for specific load requirements without exceeding safe operating limits.
Does the LT1173CS8#TRPBF support fixed 5V output without external resistors?
No - the LT1173CS8#TRPBF is the adjustable version and requires an external resistor divider on the FB pin to set output voltage. Fixed 5V and 12V variants are designated LT1173CS8-5#TRPBF and LT1173CS8-12#TRPBF respectively; those integrate internal feedback resistors and connect FB directly to VOUT.
Can the LT1173CS8#TRPBF be used in inverting (positive-to-negative) configurations?
Yes - the LT1173CS8#TRPBF supports inverting topologies as documented in the datasheet (Figure 7). In positive-to-negative mode, it generates regulated negative outputs such as –5V from a +5V input, using SW2 as the switching node and FB referenced to ground. Schottky diode D1 and proper capacitor selection are mandatory for stable operation.
What is the purpose of the AO and SET pins on the LT1173CS8#TRPBF?
The AO (pin 6) and SET (pin 7) pins form an auxiliary gain block with the negative input tied internally to the 1.245V reference. This block functions as a configurable comparator/amplifier - commonly used to implement low-battery detection (by dividing VIN to SET), linear post-regulation, or under-voltage lockout, with AO providing an open-collector output capable of sinking 100µA.
Is the LT1173CS8#TRPBF RoHS compliant and halogen-free?
Yes - the LT1173CS8#TRPBF is RoHS compliant and halogen-free, as verified by Analog Devices' official product change notices and material declarations. The "#TRPBF" suffix explicitly denotes lead-free (Pb-free), RoHS-compliant, and green packaging per JEDEC standards.
LT1173CS8#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.245V
- Voltage - Output (Max):
- 50V (Switch)
- 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#TRPBF FAQ
1.How can I place an order for LT1173CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1173CS8#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#TRPBF reliable?
The price and inventory of LT1173CS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1173CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1173CS8#TRPBF transactions.
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4.How is shipping managed for LT1173CS8#TRPBF?
LT1173CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1173CS8#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#TRPBF?
For technical support, including LT1173CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1173CS8#TRPBF requirements.
6.How does Aetrix verify that LT1173CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1173CS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1173CS8#TRPBF?
All LT1173CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1173CS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LT1173CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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