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Analog Devices Inc. LT1073CS8-12#PBF
- Part No.:
- LT1073CS8-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1073CS8-12#PBF.pdf
- Description:
- IC REG BUCK BOOST 12V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
LT1073CS8-12#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up/step-down DC/DC converter IC with fixed 12V output, internal 1A power switch, 1.0V minimum input voltage, and 95µA quiescent current in shutdown mode. It operates in gated-oscillator architecture for ultra-low power consumption and supports single-cell alkaline/NiCd battery inputs in portable instrumentation and low-power backup supplies.
For engineers reviewing the LT1073CS8-12#PBF datasheet, LT1073CS8-12#PBF pinout, LT1073CS8-12#PBF application, or LT1073CS8-12#PBF equivalent, key selection criteria include its 12V fixed output tolerance (±2.5%), user-adjustable current limit via ILIM pin, reverse-battery protection to –1.6V, and compatibility with 8-pin SOIC layout for space-constrained designs.
Technical Context
The LT1073CS8-12#PBF implements a gated-oscillator switching architecture where the internal 19kHz oscillator activates only when the SENSE (FB) pin voltage falls below the 212mV reference, minimizing idle current. Its adaptive base drive ensures switch saturation without overdrive, optimizing efficiency across input voltages from 1.0V to 30V.
It integrates an auxiliary gain block (A2) with SET/AO pins for low-battery detection or linear post-regulation, and features reverse-current limiting to 750mA at –1.6V on SW2/GND pins. The fixed 12V version uses on-chip resistor dividers to set VOUT = 12V ±0.6V, eliminating external feedback components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±0.6V (guaranteed over full temperature range) |
| Input Voltage Range | 1.0V to 30V - enables single-cell alkaline (1.0–1.5V), dual-cell (2.1–3.1V), or TTL supply (4.5–5.5V) operation |
| Quiescent Current | 95µA (switch off); 250µA typical in step-up mode at no load - extends battery life in always-on sensors |
| Switch Current Limit | User-adjustable up to 1.5A; 400mA with 220Ω ILIM-to-VIN resistor - prevents inductor saturation and switch overstress |
| Oscillator Frequency | 19kHz typical (15–23kHz range) - balances EMI, inductor size, and light-load efficiency |
| Output Ripple | Typically 350mV peak-to-peak with proper LC selection - reduced to <10mV using gain block preamplification |
| Reverse Battery Protection | Limits reverse current to ≤750mA at –1.6V applied to GND/SW2 - prevents damage during battery insertion error |
Pinout & Package
LT1073CS8-12#PBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm footprint, with standard SO-8 pin spacing (1.27mm). Thermal resistance θJA = 120°C/W.
| 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 power input | Accepts 1.0V–30V; powers internal circuitry and switch driver; reverse-battery protection active here |
| SW1 (Pin 3) | Collector of internal NPN power switch | In step-up: connects to inductor/diode node; in step-down: tied to VIN - defines primary switching path |
| SW2 (Pin 4) | Emitter of internal NPN power switch | In step-up: grounded; in step-down: drives inductor - must not fall below –0.4V (Schottky clamp required) |
| GND (Pin 5) | Analog and power ground reference | Common return for feedback, gain block, and oscillator; separate from high-current paths for noise immunity |
| A0 (Pin 6) | Auxiliary gain block open-collector output | Sinks up to 100µA; used for low-battery flag or linear post-regulator control (e.g., driving external pass transistor) |
| SET (Pin 7) | Gain block non-inverting input | Connected to resistor divider from VIN for programmable undervoltage detection threshold (212mV reference) |
| SENSE/FB (Pin 8) | Feedback input for output regulation | Internally connected to fixed 12V divider; monitors output via resistive network - no external components needed |
Key Features
| Feature | Design Value |
|---|---|
| Micropower gated-oscillator control | Reduces average supply current to 95µA in shutdown and 250µA at no-load 12V output - ideal for battery-powered meters |
| Single-cell 1.0V start-up capability | Enables direct operation from one alkaline or NiCd cell without boost pre-regulator - simplifies power architecture |
| Integrated 1A NPN power switch | Eliminates external transistor and driver; supports up to 10mA @ 12V from 1.0V input and 25mA @ 12V from 1.5V input |
| On-chip low-battery detector comparator | 212mV reference with 5–10mV hysteresis allows precise trip-point setting via external divider on SET pin |
| Reverse-battery protection | Clamps reverse current to safe levels (<750mA) at –1.6V on SW2/GND - prevents field failure due to incorrect battery insertion |
| Step-up, step-down, and inverting configurations | Configurable topology support enables 12V generation from 1.0–3.1V inputs (boost) or 12V regulation from 15–30V rails (buck) |
Applications
| Pagers & Cellular Handsets | Portable Instrumentation |
|---|---|
|
Use Scenario: Powering RF front-end modules and display drivers in compact handheld radios. IC Role / Device Role / Timing Role: Step-up DC/DC converter generating stable 12V bias from single 1.5V alkaline cell. Use Value: Enables 12V operation without bulky external regulators; 250µA no-load current extends talk time by >30% vs. alternatives. |
Use Scenario: Supplying 12V to op-amp rails and sensor excitation circuits in handheld multimeters. IC Role / Device Role / Timing Role: Fixed-output micropower converter delivering regulated 12V from 1.0–1.5V battery source. Use Value: Maintains accuracy under varying battery discharge (1.5V → 1.0V) with <0.1%/V line regulation. |
| Battery Backup Supplies | 4–20mA Loop-Powered Instruments |
|
Use Scenario: Providing fail-safe 12V hold-up power during AC mains interruption in industrial controllers. IC Role / Device Role / Timing Role: Low-quiescent step-up converter charging supercapacitor bank from backup LiSOCl₂ cell. Use Value: 95µA shutdown current minimizes self-discharge; reverse-battery protection prevents capacitor damage during swap. |
Use Scenario: Generating isolated 12V rail for signal conditioning in two-wire 4–20mA transmitters. IC Role / Device Role / Timing Role: Compact, low-noise 12V source derived from loop current via charge-pump-assisted startup. Use Value: Meets stringent <1.5mA total loop budget while delivering clean 12V for precision ADCs and DACs. |
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 |
|---|---|---|---|
| LT1073CN8-12 | Same electrical specs but in 8-lead PDIP (N8) package; θJA = 100°C/W vs. 120°C/W for SOIC | Preferred for prototyping or through-hole assembly; larger footprint and higher thermal resistance limit high-current use | Select when manual soldering or breadboard evaluation is required; avoid in thermally constrained PCBs |
| LT1173CS8-12 | Higher efficiency (up to 85% vs. 75%), 100kHz oscillator, lower 50µA quiescent current, but requires ≥3V input | Not suitable for sub-3V inputs; optimized for 5V/12V rails from USB or wall adapters rather than single-cell batteries | Choose for higher-power 12V conversion from ≥3V sources where efficiency >80% is critical |
Compared with LT1073CN8-12 and LT1173CS8-12, the LT1073CS8-12#PBF uniquely supports 1.0V start-up and maintains ultra-low 250µA operating current at 12V output - making it irreplaceable in single-cell, long-life portable systems where input voltage drops below 3V.
Availability
LT1073CS8-12#PBF is available at Aetrix Electronics and suitable for portable instrumentation, battery backup supplies, and 4–20mA loop-powered instruments requiring stable component supply with guaranteed long-term availability.
Supply support for LT1073CS8-12#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 full product support, datasheets, and application engineering for legacy Linear parts including the LT1073 family.
The LT1073 product line was designed specifically for ultra-low-power, wide-input-voltage DC/DC conversion in battery-operated portable equipment - emphasizing micropower operation, single-cell start-up, and minimal external component count.
FAQ
What is the minimum input voltage required for LT1073CS8-12#PBF to regulate 12V output?
The LT1073CS8-12#PBF guarantees regulation down to 1.0V input in step-up mode. At 1.0V input, it delivers 12V at up to 10mA; performance improves to 25mA at 1.5V input. Below 1.0V, the internal oscillator fails to sustain switching, causing output collapse. This 1.0V minimum enables direct use with deeply discharged alkaline or NiCd cells.
Can LT1073CS8-12#PBF be used in step-down (buck) configuration?
Yes, the LT1073CS8-12#PBF supports step-down operation with VIN up to 30V and VOUT limited to ≤6.2V per datasheet guidance. For 12V output, step-down is not applicable; however, it can generate lower voltages (e.g., 5V) from higher inputs like 15V or 24V rails. The SW1 and SW2 pin connections must be reconfigured per Figure 7 in the datasheet.
How does the ILIM pin function on LT1073CS8-12#PBF, and what resistor value sets 400mA current limit?
The ILIM pin on LT1073CS8-12#PBF programs switch current limit by sensing voltage drop across an external resistor between ILIM and VIN. A 220Ω resistor sets ~400mA limit, as confirmed in Electrical Characteristics table (ILIM = 400mA at 220Ω). This prevents inductor saturation and switch overstress when input voltage varies - critical in battery-powered designs with wide discharge ranges.
Does LT1073CS8-12#PBF require external feedback resistors to set 12V output?
No. The LT1073CS8-12#PBF is the fixed 12V version: internal resistor dividers connect the SENSE (FB) pin to the 212mV reference, yielding VOUT = 12V ±0.6V without any external components. This eliminates feedback resistor tolerance errors and saves board space - a key advantage over adjustable versions like LT1073CS8.
What is the purpose of the AO and SET pins on LT1073CS8-12#PBF, and how are they used?
The AO (Pin 6) and SET (Pin 7) pins implement the auxiliary gain block (A2): SET is the non-inverting input referenced to 212mV, and AO is its open-collector output sinking up to 100µA. They enable low-battery detection (e.g., trip at 1.1V via resistor divider on SET) or linear post-regulation. In LT1073CS8-12#PBF, this function remains fully accessible and independent of the fixed 12V regulation path.
LT1073CS8-12#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):
- 12V
- 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
LT1073CS8-12#PBF FAQ
1.How can I place an order for LT1073CS8-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1073CS8-12#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 LT1073CS8-12#PBF reliable?
The price and inventory of LT1073CS8-12#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1073CS8-12#PBF is usually 5 days.
3.What payment methods are accepted for LT1073CS8-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1073CS8-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1073CS8-12#PBF?
LT1073CS8-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1073CS8-12#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 LT1073CS8-12#PBF?
For technical support, including LT1073CS8-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1073CS8-12#PBF requirements.
6.How does Aetrix verify that LT1073CS8-12#PBF is sourced from the original manufacturer or authorized distributors?
All LT1073CS8-12#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 LT1073CS8-12#PBF meets industry standards.
7.What is the process for return or replacement of LT1073CS8-12#PBF?
All LT1073CS8-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1073CS8-12#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 LT1073CS8-12#PBF part is unused and in its original packaging.
Return procedure for LT1073CS8-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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