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Analog Devices Inc. LT1073CS8-5#TRPBF
- Part No.:
- LT1073CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1073CS8-5#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,890
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Product details
Overview
LT1073CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up/step-down DC/DC converter in SO-8 package, delivering fixed 5V output with 1V minimum input voltage, 135µA quiescent current, and internal 1A power switch - ideal for single-cell alkaline/NiCd-powered portable instruments and battery backup supplies.
For engineers reviewing the LT1073CS8-5#TRPBF datasheet, LT1073CS8-5#TRPBF pinout, LT1073CS8-5#TRPBF application, or LT1073CS8-5#TRPBF equivalent, key selection criteria include its 1V–30V input range, user-adjustable current limit via ILIM pin, on-chip low-battery comparator, gated-oscillator architecture enabling ultra-low idle current, and compatibility with three-component fixed-output designs.
Technical Context
The LT1073CS8-5#TRPBF implements a gated-oscillator switching architecture where the 19kHz oscillator activates only when FB voltage falls below 212mV reference, minimizing quiescent current to 135µA under no load. Its adaptive base drive ensures switch saturation without overdrive, optimizing efficiency across input voltages from 1V to 30V.
It integrates dual functional blocks: a comparator-based regulation loop controlling SW1/SW2 NPN power switch (1.5A max), and an auxiliary gain block (A2) with SET/AO pins enabling low-battery detection or linear post-regulation. The fixed 5V version embeds internal feedback resistors, eliminating external R1/R2 while maintaining 4.75–5.25V output tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2.5% (guaranteed 4.75V–5.25V at full temperature range) |
| Input Voltage Range | 1V to 30V (supports single-cell alkaline down to 1V; step-down mode up to 36V absolute max) |
| Quiescent Current | 135µA typical at no load (enables multi-year battery life in low-duty-cycle portable devices) |
| Switch Current Limit | Internally set to 1.5A; adjustable to ~400mA via 220Ω resistor from ILIM to VIN |
| Oscillator Frequency | 19kHz typical (38µs ON / 15µs OFF timing optimized for 1.5V→5V boost conversion) |
| Operating Temperature | 0°C to 70°C (commercial grade; SO-8 package with θJA = 120°C/W) |
| Output Ripple | ~150mV peak-to-peak (with proper 100µF OS-CON or low-ESR capacitor) |
Pinout & Package
LT1073CS8-5#TRPBF uses an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012AC compliant, rated for 500mW max power dissipation at TA = 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit programming input | Connect to VIN directly for 1.5A internal limit; add resistor to VIN to reduce switch current (e.g., 220Ω → ~400mA) |
| VIN (Pin 2) | Main supply input | Accepts 1V–30V; powers internal circuitry and switch driver; reverse-battery protected to –1.6V |
| SW1 (Pin 3) | Power switch collector | In boost mode: drives inductor/diode; in buck mode: tied to VIN; withstands up to 50V |
| SW2 (Pin 4) | Power switch emitter | In boost mode: grounded; in buck mode: drives inductor; must not fall below –0.4V |
| GND (Pin 5) | Analog and power ground | Common reference for all internal circuits; requires low-impedance PCB connection |
| A0 (Pin 6) | Auxiliary gain block open-collector output | Sinks 100µA; used for low-battery flag or linear post-regulator control |
| SET (Pin 7) | Auxiliary gain block non-inverting input | Connected to resistor divider from VIN for programmable undervoltage detection threshold |
| FB/SENSE (Pin 8) | Feedback sense input | Internal 5V reference divider node; no external resistor required for LT1073CS8-5#TRPBF |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 95µA quiescent current in shutdown; 135µA in active no-load boost mode enables decade-scale battery life |
| Single-cell compatibility | 1V minimum start-up voltage allows direct use with depleted alkaline or NiCd cells |
| Integrated low-battery detector | On-chip comparator with 212mV reference and 5–10mV hysteresis enables precise trip-point setting via external divider |
| Configurable topology support | Native step-up, step-down, and inverting operation without external controller or mode-select pins |
| Reverse-battery protection | Limits reverse current to safe levels (<750mA) at up to –1.6V applied to GND/SW2 pins |
Applications
| Portable Medical Sensors | Battery Backup Power Supplies |
|---|---|
Use Scenario: Handheld α/β/γ particle detectors powered by single AA alkaline cell requiring stable 5V rail during intermittent pulse acquisition. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting 1.0–1.5V cell voltage to regulated 5V output; gated-oscillator minimizes idle drain between sensor triggers. Use Value: Enables >2 years of field operation on one AA cell due to 135µA no-load current and 1V operational floor. |
Use Scenario: RAM retention circuit in industrial PLCs where main 3.3V/5V rail may fail unexpectedly. IC Role / Device Role / Timing Role: Standby converter activated upon main rail collapse; draws <200µA from backup lithium coin cell until system reset. Use Value: Maintains volatile memory state for >72 hours using CR2032 coin cell, leveraging 1V start-up and reverse-battery protection. |
| Low-Power Instrumentation | Handheld Inventory Computers |
Use Scenario: 4–20mA loop-powered field transmitter with integrated microcontroller and analog front-end needing isolated 5V supply. IC Role / Device Role / Timing Role: Step-up converter generating 5V from loop's 12–30V range; operates in discontinuous conduction mode for high light-load efficiency. Use Value: Delivers 10mA @ 5V with <0.1% line regulation from 12V–30V input, meeting loop-power budget constraints. |
Use Scenario: Barcode scanner in warehouse handheld with alkaline battery pack and intermittent 5V camera module activation. IC Role / Device Role / Timing Role: Primary 5V supply enabling fast wake-up from deep sleep; ILIM pin limits inrush during cold-start from weak batteries. Use Value: Prevents brown-out during motor + imager startup by capping peak switch current to 400mA via 220Ω ILIM resistor. |
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 |
|---|---|---|---|
| MAX761ESA+ | Fixed 5V output; 1.1V min input; 110µA quiescent current; no integrated low-battery comparator | Lacks on-chip undervoltage detection; requires external comparator for battery monitoring | Preferred when lowest possible quiescent current is critical and battery monitoring is handled externally |
| TPS61200DRCR | Adjustable output (1.2–5.5V); 0.3V min input; 120µA quiescent current; integrated soft-start and thermal shutdown | Requires external feedback resistors; supports wider input range but lacks reverse-battery protection | Chosen for ultra-low-voltage inputs (<1V) or when output adjustability and safety features outweigh fixed-voltage simplicity |
Compared with MAX761ESA+ and TPS61200DRCR, the LT1073CS8-5#TRPBF uniquely combines fixed 5V output, 1V start-up, on-chip low-battery comparator, and reverse-battery protection in a minimal 3-component solution - making it optimal for cost-sensitive, space-constrained single-cell systems where functional integration reduces BOM count.
Availability
LT1073CS8-5#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, battery backup power supplies, low-power instrumentation, and handheld inventory computers requiring stable component supply with long-lifecycle assurance.
Supply support for LT1073CS8-5#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, datasheet documentation, and long-term manufacturing commitment for legacy Linear parts including the LT1073 family.
The LT1073 series was designed specifically for ultra-low-power, single-cell DC/DC conversion in portable and battery-critical applications - emphasizing micropower operation, wide input range, and functional integration without external controllers.
FAQ
What is the minimum input voltage required for LT1073CS8-5#TRPBF to start regulation?
The LT1073CS8-5#TRPBF starts regulation at 1.0V input voltage and maintains stable 5V output down to this level. It delivers 10mA at 5V from a 1V source and 40mA from a 1.25V source, making it uniquely suited for deeply discharged alkaline or NiCd cells. Operation below 1V is not guaranteed per datasheet specifications.
Does LT1073CS8-5#TRPBF require external feedback resistors to set the 5V output?
No. The LT1073CS8-5#TRPBF integrates precision internal feedback resistors to establish the fixed 5V output - only three external components (inductor, diode, output capacitor) are needed for a complete converter. This eliminates resistor tolerance errors and layout sensitivity associated with external dividers.
How does the ILIM pin function in LT1073CS8-5#TRPBF, and what value resistor sets 400mA current limit?
The ILIM pin on LT1073CS8-5#TRPBF allows user-adjustable switch current limiting. Connecting a 220Ω resistor between ILIM and VIN sets the peak switch current to approximately 400mA. This protects the internal 1.5A switch and external inductor during high-input-voltage or continuous-conduction-mode conditions.
Can LT1073CS8-5#TRPBF be used in step-down (buck) configuration, and what is the maximum safe output voltage?
Yes, LT1073CS8-5#TRPBF supports step-down operation with SW1 tied to VIN and SW2 driving the inductor. However, output voltage must be limited to ≤6.2V in buck mode to prevent excessive stress on internal transistors and ensure reliable operation per datasheet guidelines.
What is the purpose of the AO and SET pins on LT1073CS8-5#TRPBF, and how are they typically used?
The AO (pin 6) and SET (pin 7) pins implement an auxiliary gain block with 212mV internal reference. SET accepts a resistor divider from VIN to set a low-battery detection threshold; AO provides open-collector output that sinks 100µA to signal microcontrollers when VIN drops below that threshold - enabling autonomous battery monitoring without external ICs.
LT1073CS8-5#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
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 19kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1073CS8-5#TRPBF FAQ
1.How can I place an order for LT1073CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1073CS8-5#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 LT1073CS8-5#TRPBF reliable?
The price and inventory of LT1073CS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1073CS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1073CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1073CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1073CS8-5#TRPBF?
LT1073CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1073CS8-5#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 LT1073CS8-5#TRPBF?
For technical support, including LT1073CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1073CS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1073CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1073CS8-5#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 LT1073CS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1073CS8-5#TRPBF?
All LT1073CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1073CS8-5#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 LT1073CS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1073CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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