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Analog Devices Inc. LT1073CS8#PBF
- Part No.:
- LT1073CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1073CS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:198
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Product details
Overview
LT1073CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up/step-down DC/DC converter IC with internal 1A power switch, adjustable output voltage (via FB pin), 19kHz gated oscillator, 1V minimum input voltage, and on-chip auxiliary gain block for low-battery detection. It delivers 5V at 40mA from 1.25V input in boost mode and supports single-cell alkaline/Ni-Cd battery-powered portable instruments.
For engineers reviewing the LT1073CS8#PBF datasheet, LT1073CS8#PBF pinout, LT1073CS8#PBF application, or LT1073CS8#PBF equivalent, key selection considerations include its 1V start-up capability, user-adjustable current limit via ILIM pin, reverse-battery protection to –1.6V, 95µA quiescent current in shutdown, and compatibility with three-component fixed-output configurations using external inductor/diode/capacitor.
Technical Context
The LT1073CS8#PBF implements a gated-oscillator architecture where the 19kHz oscillator activates only when the FB pin voltage falls below the 212mV internal reference, minimizing quiescent current. Its adaptive base drive ensures switch saturation without overdrive, improving efficiency in both step-up and step-down topologies.
Switch control is managed by an internal NPN transistor with VIN-referenced current limiting (adjustable via resistor between ILIM and VIN), while the auxiliary gain block (SET/AO pins) provides comparator functionality referenced to the same 212mV bandgap, enabling low-battery detection or linear post-regulation without external op amps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.0V to 30V (step-up), 3V to 36V (step-down); enables single-cell alkaline (1.0–1.5V) operation |
| Quiescent Current | 95µA (shutdown), 135µA (LT1073-5 no-load); extends battery life in always-on portable devices |
| Output Voltage | Adjustable via FB pin using resistor divider; VOUT = 212mV × (1 + R2/R1) |
| Switch Current Limit | User-adjustable up to 1.5A; 400mA with 220Ω resistor from ILIM to VIN |
| Oscillator Frequency | 19kHz typical (15–23kHz); fixed frequency simplifies EMI filtering and inductor selection |
| Reference Voltage | 212mV ±10mV (comparator trip point); stable bandgap reference enables precise feedback control |
| Reverse Battery Protection | Limits reverse current to ≤750mA at –1.6V applied to GND/SW2; prevents damage during battery insertion error |
Pinout & Package
LT1073CS8#PBF is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC dimensions (4.9mm × 6.0mm × 1.75mm), RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit programming input | Resistor from ILIM to VIN sets switch current threshold; open or tied to VIN enables 1.5A internal limit |
| VIN (Pin 2) | Main supply input | Accepts 1V–30V (boost) or 3V–36V (buck); powers internal circuitry and switch driver |
| SW1 (Pin 3) | Power switch collector | In boost: connects to inductor/diode node; in buck: tied to VIN |
| SW2 (Pin 4) | Power switch emitter | In boost: grounded; in buck: drives inductor; must not fall below –0.4V |
| GND (Pin 5) | Analog and power ground | Common return for reference, comparator, and switch; requires low-impedance PCB connection |
| A0 (Pin 6) | Auxiliary gain block output | Open-collector NPN output sinking up to 100µA; used for low-battery flag or post-regulator drive |
| SET (Pin 7) | Auxiliary gain block non-inverting input | Connects to resistor divider from VIN for programmable undervoltage detection threshold |
| FB/SENSE (Pin 8) | Feedback input / voltage sense | Compares against 212mV reference; determines output regulation point in adjustable configuration |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 95µA shutdown current enables >1-year battery life in low-duty-cycle sensor nodes |
| Single-cell start-up | 1.0V minimum input allows direct use with depleted alkaline or Ni-Cd cells without pre-charge circuitry |
| Configurable topology | Supports boost, buck, inverting, and SEPIC modes using same IC and minimal external components |
| Integrated protection | Reverse-battery tolerance to –1.6V and internal current limiting prevent field failures in consumer handhelds |
| On-chip auxiliary amplifier | SET/AO pins form a 212mV-referenced comparator for battery monitoring without external ICs |
Applications
| Pagers & Cellular Telephones | Hand-Held Inventory Computers |
|---|---|
Use Scenario: Powering RF front-end and baseband logic from single AA/AAA cell with variable discharge profile. IC Role / Device Role / Timing Role: Primary DC/DC converter regulating 3.3V or 5V rail; operates in gated-oscillator mode to minimize idle current. Use Value: Enables 100+ hours of standby time on one alkaline cell due to 95µA shutdown current and 1V start-up capability. |
Use Scenario: Supplying 5V to barcode scanner engine and microcontroller in ruggedized warehouse scanners. IC Role / Device Role / Timing Role: Step-up converter generating stable 5V from 1.2–1.5V Ni-MH battery pack; uses ILIM pin to clamp peak switch current during motor-triggered load surges. Use Value: Eliminates need for discrete current-limiting circuitry while maintaining <100mV output ripple under dynamic loads. |
| Battery-Powered Particle Detectors | 4–20mA Loop-Powered Instruments |
Use Scenario: Providing isolated high-voltage bias (±12V) for α/β/γ radiation sensor arrays powered by coin-cell batteries. IC Role / Device Role / Timing Role: Inverting converter generating negative rail from single positive supply; leverages LT1073CS8#PBF's ability to operate down to 1V input. Use Value: Achieves >500-hour runtime on CR2032 by combining ultra-low quiescent current with efficient inductive energy transfer. |
Use Scenario: Powering analog signal conditioning circuitry in two-wire industrial transmitters drawing <4mA from loop. IC Role / Device Role / Timing Role: Low-noise step-up converter supplying 5V to op-amps and ADCs; configured with OS-CON capacitor to reduce ripple below 10mV. Use Value: Maintains 16-bit measurement accuracy by suppressing switching noise coupling into sensitive analog front-ends. |
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 |
|---|---|---|---|
| MAX630ESA+ | Fixed 5V output only; 1.5V min input; 120µA quiescent current; no ILIM pin or auxiliary comparator | Lacks adjustable output and battery-monitoring capability; suitable only for simple fixed-rail replacement | Choose when board space is constrained and output voltage is invariant across product variants |
| TPS61200DRCR | 200mA max output; 0.3V min input; integrated synchronous rectifier; 55µA quiescent current | Higher efficiency at light loads but limited output current; no reverse-battery protection or gain block | Prefer for sub-100mA applications requiring lowest possible IQ, accepting loss of diagnostic features |
Compared with MAX630ESA+ and TPS61200DRCR, the LT1073CS8#PBF uniquely combines 1V start-up, user-programmable current limiting, reverse-battery tolerance, and an integrated comparator-making it optimal for cost-sensitive, battery-critical portable instrumentation where design flexibility and robustness outweigh raw efficiency metrics.
Availability
LT1073CS8#PBF is available at Aetrix Electronics and suitable for pagers, hand-held inventory computers, battery-powered particle detectors, and 4–20mA loop-powered instruments requiring stable component supply across extended production lifecycles.
Supply support for LT1073CS8#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 support for legacy Linear products including the LT1073 family. Linear pioneered high-performance analog ICs with emphasis on precision, power efficiency, and ruggedness.
The LT1073CS8#PBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-operated portable equipment where ultra-low quiescent current, wide input range, and topology flexibility are critical.
FAQ
What is the minimum input voltage required for LT1073CS8#PBF to start switching?
The LT1073CS8#PBF guarantees operation down to 1.0V input voltage in step-up mode, enabling reliable startup from nearly depleted single-cell alkaline or Ni-Cd batteries. This is achieved through optimized bandgap reference and low-threshold comparator circuitry. Below 1.0V, the device remains in shutdown with only 95µA quiescent draw. The LT1073CS8#PBF datasheet specifies 1.15V typical start-up voltage at 25°C, but functional operation is verified to 1.0V across temperature.
Can LT1073CS8#PBF be used in step-down (buck) configuration?
Yes, the LT1073CS8#PBF supports step-down operation with input voltages from 3V to 36V and output voltages up to 6.2V. In buck mode, SW1 connects to VIN and SW2 drives the inductor, requiring a Schottky catch diode. The LT1073CS8#PBF's internal current limit and gated-oscillator architecture maintain stability across load transients, though the LT1173 is recommended for inputs above 3V due to higher efficiency.
How does the ILIM pin function on LT1073CS8#PBF?
The ILIM pin on LT1073CS8#PBF allows user-adjustable current limiting by connecting a resistor between ILIM and VIN. A 220Ω resistor sets the switch current limit to approximately 400mA; lower resistance increases the limit up to the internal 1.5A maximum when ILIM is tied directly to VIN. This feature prevents inductor saturation and switch overstress during input voltage excursions or transient loads, and is essential for continuous-mode operation in boost converters.
What is the purpose of the AO and SET pins on LT1073CS8#PBF?
The AO (pin 6) and SET (pin 7) pins form an auxiliary gain block referenced to the internal 212mV bandgap. SET serves as the non-inverting input, allowing resistor-divider programming of a low-battery detection threshold; AO is an open-collector output sinking up to 100µA, usable to drive microcontroller interrupt lines or enable/disable downstream circuitry. This eliminates the need for external comparators in battery-monitoring applications.
Does LT1073CS8#PBF include reverse-battery protection?
Yes, the LT1073CS8#PBF incorporates unique reverse-battery protection that limits reverse current to ≤750mA when –1.6V is applied to GND and SW2 pins (with VIN, ILIM, and SW1 grounded). This protects the IC from damage during incorrect battery installation in consumer handheld devices. The protection operates without external components and is specified across the full operating temperature range.
LT1073CS8#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 50V (Switch)
- 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#PBF FAQ
1.How can I place an order for LT1073CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1073CS8#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#PBF reliable?
The price and inventory of LT1073CS8#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#PBF is usually 5 days.
3.What payment methods are accepted for LT1073CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1073CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1073CS8#PBF?
LT1073CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1073CS8#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#PBF?
For technical support, including LT1073CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1073CS8#PBF requirements.
6.How does Aetrix verify that LT1073CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1073CS8#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#PBF meets industry standards.
7.What is the process for return or replacement of LT1073CS8#PBF?
All LT1073CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1073CS8#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#PBF part is unused and in its original packaging.
Return procedure for LT1073CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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