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Analog Devices Inc. LT1073CS8-5#PBF
- Part No.:
- LT1073CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1073CS8-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,548
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Product details
Overview
LT1073CS8-5#PBF from Analog Devices (formerly Linear Technology) is a micropower, fixed 5V step-up/step-down DC/DC converter IC with integrated 1A power switch, on-chip auxiliary gain block, and user-adjustable current limit. It operates from 1V to 30V input, delivers up to 40mA at 5V from 1.25V input, and consumes only 135µA quiescent current in step-up mode - ideal for single-cell alkaline or Ni-Cd battery-powered portable instruments and low-power backup supplies.
For engineers reviewing the LT1073CS8-5#PBF datasheet, LT1073CS8-5#PBF pinout, LT1073CS8-5#PBF application, or LT1073CS8-5#PBF equivalent, key selection criteria include its 1V minimum start-up voltage, internal 212mV reference, 19kHz gated oscillator architecture, reverse-battery protection to –1.6V, and compatibility with three-component fixed-output designs using SO-8 packaging.
Technical Context
The LT1073CS8-5#PBF implements a gated-oscillator switching architecture where the internal 19kHz oscillator activates only when the SENSE (FB) pin voltage falls below the 212mV internal reference, minimizing quiescent current to 135µA under no load. Its adaptive base drive ensures switch saturation without overdrive, optimizing efficiency across input ranges from 1V to 30V.
It supports both step-up (boost) and step-down (buck) topologies via SW1/SW2 pin reconfiguration, includes a dedicated ILIM pin for external current limiting (e.g., 220Ω sets ~400mA limit), and integrates a PNP-input auxiliary gain block (AO/SET pins) usable as low-battery detector or linear post-regulator - all within an 8-pin SOIC package with thermal resistance θJA = 120°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2.5% (guaranteed over temperature and line/load) |
| Input Voltage Range | 1.0V to 30V - enables direct operation from single alkaline/Ni-Cd cells or higher-voltage rails |
| Quiescent Current | 135µA typical in step-up mode - extends battery life in always-on portable devices |
| Switch Current Limit | User-adjustable up to 1.5A via ILIM pin resistor - prevents inductor saturation and switch overstress |
| Oscillator Frequency | 19kHz typical gated frequency - balances efficiency, EMI, and component size for micropower applications |
| Reference Voltage | 212mV ±10mV internal bandgap - sets output accuracy and enables low-voltage feedback sensing |
| Reverse Battery Protection | Limits reverse current to ≤750mA at –1.6V applied - protects circuitry during battery insertion errors |
Pinout & Package
LT1073CS8-5#PBF is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC footprint, 1.27mm pitch, and θJA = 120°C/W. Pin 1 (ILIM) is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - ILIM | Current limit programming input | Connect to VIN directly for 1.5A internal limit; add resistor to VIN to reduce peak switch current (e.g., 220Ω → ~400mA) |
| 2 - VIN | Main supply input | Accepts 1V–30V; powers internal circuitry and switch driver; reverse-battery protected to –1.6V |
| 3 - SW1 | Power switch collector | In boost: connects to inductor/diode node; in buck: tied to VIN - defines topology configuration |
| 4 - SW2 | Power switch emitter | In boost: grounded; in buck: drives inductor - must not fall below –0.4V to avoid damage |
| 5 - GND | Analog and power ground | Common reference for feedback, comparator, and oscillator; requires low-impedance PCB connection |
| 6 - AO | Auxiliary gain block open-collector output | Sinks 100µA max; used for low-battery detection or driving external logic/enable circuits |
| 7 - SET | Auxiliary gain block non-inverting input | Accepts resistor divider from VIN to set comparator trip point; bias current <120nA |
| 8 - FB/SENSE | Feedback input (fixed 5V version) | Internally connected to precision resistor divider; senses output via resistive network to maintain 5V regulation |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 135µA typical supply current in step-up mode enables >1000-hour runtime on AA cell at light load |
| Single-cell start-up | Guaranteed operation down to 1.0V input - supports depleted alkaline/Ni-Cd cells without brownout |
| Integrated 1A power switch | Eliminates external transistor; reduces BOM count and layout complexity in space-constrained designs |
| On-chip auxiliary gain block | Configurable as low-battery detector (trip at 212mV × R1/R2) or linear post-regulator - adds system-level monitoring without extra op amps |
| Three-component fixed-output design | Requires only inductor, diode, and output capacitor - simplifies design validation and accelerates prototyping |
| Reverse-battery protection | Clamps reverse current to safe levels (<750mA) at –1.6V - prevents damage during field battery replacement |
Applications
| Single-Cell to 5V Power Supply | Battery Backup for Real-Time Clocks |
|---|---|
Use Scenario: Powering microcontroller-based handheld inventory scanners powered by one AA alkaline cell. IC Role / Device Role / Timing Role: Step-up DC/DC converter generating stable 5V rail from 1.0–1.5V battery input. Use Value: Enables continuous operation down to 1.0V battery voltage while maintaining 40mA output capability - extends usable battery life by >30% versus competing converters. |
Use Scenario: Providing regulated 5V standby power to RTC and SRAM during main system shutdown. IC Role / Device Role / Timing Role: Low-quiescent-current DC/DC converter sustaining backup rail from primary battery or supercapacitor. Use Value: 135µA no-load current minimizes drain on backup source, supporting >1-year retention without recharge. |
| Portable Medical Sensors | 4–20mA Loop-Powered Instruments |
Use Scenario: Powering battery-operated α/β/γ particle detectors in field radiation monitoring equipment. IC Role / Device Role / Timing Role: Micropower step-up regulator delivering clean 5V for analog front-end and ADC from single Ni-Cd cell. Use Value: 19kHz gated oscillator and internal 212mV reference ensure low noise and high PSRR - critical for low-level signal integrity. |
Use Scenario: Generating isolated 5V supply for sensor signal conditioning in loop-powered industrial transmitters. IC Role / Device Role / Timing Role: Compact, low-heat DC/DC converter operating from 4–20mA loop with minimal headroom loss. Use Value: 1V minimum input allows operation even at lowest loop current (4mA), enabling full-range functionality without auxiliary power. |
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 |
|---|---|---|---|
| LT1073CN8-5 | Same electrical specs, but in 8-lead PDIP (N8) package with θJA = 100°C/W - higher thermal performance, through-hole mounting | Preferred for prototyping, high-reliability industrial boards, or where manual assembly is required | Select LT1073CN8-5 for breadboarding or legacy through-hole designs; LT1073CS8-5#PBF for volume surface-mount production. |
| LT1173CS8-5 | Higher 100kHz switching frequency, lower 100µA quiescent current, but requires ≥3V input - no 1V start-up capability | Better suited for higher-input-voltage applications (e.g., dual-cell or regulated 3.3V/5V rails) where size and ripple matter more than ultra-low-VIN | Choose LT1173CS8-5 when input exceeds 3V and board space is constrained; retain LT1073CS8-5#PBF for true single-cell 1V–1.5V operation. |
Compared with LT1073CN8-5 and LT1173CS8-5, the LT1073CS8-5#PBF uniquely combines SO-8 surface-mount compatibility, 1V start-up, and 135µA quiescent current - making it the only option for compact, battery-depleted, production-ready micropower boost/buck conversion.
Availability
LT1073CS8-5#PBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-backed memory systems, and low-power industrial sensors requiring stable component supply with long-lifecycle support.
Supply support for LT1073CS8-5#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 full product support, datasheets, and application engineering for the LT® family of precision analog and power ICs.
The LT1073 series was designed specifically for ultra-low-power, wide-input-voltage DC/DC conversion in battery-critical applications - emphasizing micropower operation, single-cell start-up, and minimal external component count.
FAQ
What is the minimum input voltage required for LT1073CS8-5#PBF to start switching?
The LT1073CS8-5#PBF guarantees operation down to 1.0V input voltage in step-up mode, enabling reliable start-up from nearly depleted single alkaline or Ni-Cd cells. This is achieved via a low-threshold internal reference and optimized oscillator control - no external wake-up circuitry is needed. The device remains functional up to 30V input in step-down mode.
Can LT1073CS8-5#PBF be used in step-down (buck) configuration?
Yes, the LT1073CS8-5#PBF supports step-down operation by reconfiguring SW1 and SW2 connections: tie SW1 to VIN and route SW2 to the inductor. Output voltage remains regulated at 5V, but maximum output is limited to 6.2V due to internal switch constraints. The device retains its 135µA quiescent current and reverse-battery protection in this mode.
How does the ILIM pin function on LT1073CS8-5#PBF?
The ILIM pin on LT1073CS8-5#PBF allows user-adjustable current limiting: connecting it directly to VIN enables the internal 1.5A switch limit, while adding a resistor (e.g., 220Ω) between ILIM and VIN reduces peak switch current to ~400mA. This prevents inductor saturation and switch overstress when input voltage varies widely - critical in battery-powered applications.
What is the purpose of the AO and SET pins on LT1073CS8-5#PBF?
The AO (open-collector output) and SET (non-inverting input) pins form an auxiliary gain block on LT1073CS8-5#PBF. With the internal 212mV reference connected to the inverting input, this block functions as a low-battery detector (e.g., trip at 2.1V via resistor divider) or linear post-regulator. AO sinks up to 100µA and interfaces directly with microcontroller GPIO or enable inputs.
Does LT1073CS8-5#PBF require external compensation components?
No, the LT1073CS8-5#PBF uses a gated-oscillator architecture with built-in hysteresis that provides inherent loop stability - no external compensation capacitors or resistors are required. This simplifies design and reduces bill-of-materials cost, especially in fixed-output configurations where only inductor, Schottky diode, and output capacitor are needed.
LT1073CS8-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT1073CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1073CS8-5#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 LT1073CS8-5#PBF reliable?
The price and inventory of LT1073CS8-5#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LT1073CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1073CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1073CS8-5#PBF?
LT1073CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1073CS8-5#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 LT1073CS8-5#PBF?
For technical support, including LT1073CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1073CS8-5#PBF requirements.
6.How does Aetrix verify that LT1073CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1073CS8-5#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 LT1073CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1073CS8-5#PBF?
All LT1073CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1073CS8-5#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 LT1073CS8-5#PBF part is unused and in its original packaging.
Return procedure for LT1073CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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