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Analog Devices Inc. LT1110CN8-12#PBF
- Part No.:
- LT1110CN8-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1110CN8-12#PBF.pdf
- Description:
- IC REG BUCK BOOST 12V 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1110CN8-12#PBF from Analog Devices is a micropower DC-DC converter IC configured for fixed 12V step-up or step-down operation, featuring an internal 1A power switch, 70kHz gated oscillator, 300µA quiescent current, and on-chip low-battery detector comparator. It operates from 1.0V to 30V input and delivers regulated 12V output with ±5% accuracy across temperature, enabling single-cell battery-powered instrumentation and portable electronics.
For engineers reviewing the LT1110CN8-12#PBF datasheet, LT1110CN8-12#PBF pinout, LT1110CN8-12#PBF application, or LT1110CN8-12#PBF equivalent, key selection criteria include minimum 1.0V start-up voltage, user-adjustable switch current limit via ILIM pin, reverse battery protection up to –1.6V, fixed 12V output tolerance (11.4–12.6V), and compatibility with surface-mount inductors and Schottky diodes in compact 8-pin MiniDIP packaging.
Technical Context
The LT1110CN8-12#PBF implements a gated oscillator architecture where the 70kHz switching cycle activates only when the FB/SENSE pin voltage falls below the internal 220mV reference, minimizing quiescent current to 300µA. Its adaptive base drive ensures switch saturation without overdrive, improving efficiency in both step-up and step-down topologies.
Internal circuitry includes a dedicated auxiliary gain block (A2) with 220mV reference, enabling low-battery detection or linear post-regulation, and a reverse battery protection circuit limiting destructive reverse current to safe levels at up to –1.6V applied to GND/SW2 pins while VIN, ILIM, and SW1 are grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±5% (11.4–12.6V), guaranteed over full 0°C to 70°C operating range |
| Input Voltage Range | 1.0V to 30V - supports single alkaline or NiMH cell start-up and wide industrial supply rails |
| Quiescent Current | 300µA typical - enables multi-year battery life in remote sensor and pager applications |
| Oscillator Frequency | 70kHz typical (52–90kHz range) - allows use of small, low-cost surface-mount inductors and capacitors |
| Switch Current Limit | User-adjustable via external resistor on ILIM pin; internal default is 1.5A - prevents inductor saturation and switch damage under high-VIN conditions |
| Reverse Battery Protection | Withstands –1.6V applied to GND/SW2 pins continuously - eliminates need for external blocking diode in battery-reversal-prone designs |
| Output Ripple | Typically 200mV peak-to-peak with proper LC selection - reduced further using A2 gain block as pre-amplifier at FB pin |
Pinout & Package
LT1110CN8-12#PBF is housed in an 8-lead plastic DIP (N8) package, 0.300" wide, with through-hole mounting and JEDEC MS-001AC outline. Pin 1 is ILIM, pin 2 is VIN, pin 3 is SW1, pin 4 is SW2, pin 5 is GND, pin 6 is AO, pin 7 is SET, and pin 8 is FB/SENSE.
| 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 supply input | Accepts 1.0–30V; powers internal circuitry and supplies switch collector in step-down mode |
| SW1 (Pin 3) | Collector of internal NPN power switch | In step-up: connects to inductor/diode node; in step-down: connects to VIN rail |
| SW2 (Pin 4) | Emitter of internal NPN power switch | In step-up: connects to GND; in step-down: connects to inductor/diode node; must not go below –0.5V |
| GND (Pin 5) | Analog and power ground reference | Common return for feedback, gain block, and oscillator; separate from high-current paths in layout |
| AO (Pin 6) | Auxiliary gain block open-collector output | Sinks 300µA max; used for low-battery flag or linear post-regulator control |
| SET (Pin 7) | Inverting input of auxiliary gain block (A2) | Connected to resistor divider from VIN to GND to set low-battery trip point relative to 220mV reference |
| FB/SENSE (Pin 8) | Feedback input for regulation loop | On LT1110CN8-12#PBF: connected internally to fixed-resistor network setting 12V output; no external divider required |
Key Features
| Feature | Design Value |
|---|---|
| Single-cell start-up capability | Operates down to 1.0V input - enables direct use with depleted AA/AAA/NiMH cells without boost pre-regulator |
| Gated oscillator architecture | Switches only when FB drops below 220mV - reduces quiescent current to 300µA and eliminates need for external frequency compensation |
| Integrated low-battery detector | On-chip comparator with 220mV reference and 4–8mV hysteresis - provides reliable undervoltage warning without external components |
| Reverse battery protection | Guaranteed operation at –1.6V on GND/SW2 pins - prevents damage during accidental battery reversal in handheld devices |
| Flexible topology support | Configurable as step-up, step-down, or inverting converter - accommodates 12V generation from 1.5V–24V inputs using same IC |
Applications
| Pagers | Single-Cell to 12V Converters |
|---|---|
Use Scenario: Low-power alphanumeric pagers requiring stable 12V bias for RF front-end and display backlight. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated 12V from single 1.5V alkaline cell with minimal quiescent drain. Use Value: Enables >2-year shelf life with 300µA quiescent current and 1.0V start-up, eliminating need for multi-cell packs or external LDOs. | Use Scenario: Portable test equipment needing isolated 12V rail from a single NiMH cell (1.0–1.4V) for op-amp biasing and sensor excitation. IC Role / Device Role / Timing Role: Fixed-output step-up regulator generating precise 12V with ±5% tolerance across temperature and load. Use Value: Delivers 12V at up to 120mA with <200mV ripple using standard 47µH inductor and OS-CON capacitor - no trimming or calibration required. |
| Battery Backup Supplies | Laptop and Palmtop Computers |
Use Scenario: Real-time clock (RTC) backup circuit maintaining CMOS RAM and clock during main power loss. IC Role / Device Role / Timing Role: Micropower step-up converter sustaining 12V backup rail from coin-cell or supercapacitor charged to ≥1.0V. Use Value: Maintains regulation down to 1.0V input with 300µA sleep current - extends backup runtime by >3× versus higher-IQ alternatives. | Use Scenario: Subsystem power management in legacy palmtops requiring 12V for LCD bias or peripheral interface. IC Role / Device Role / Timing Role: Secondary DC-DC controller providing isolated 12V from main 3.3V/5V rail in buck configuration. Use Value: Achieves >85% efficiency at 250mA output using step-down mode with 47µH inductor and MBRS130T3 Schottky - reduces thermal load in space-constrained chassis. |
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 |
|---|---|---|---|
| LT1111CN8-12#PBF | Optimized for step-down only; higher efficiency above 3V input; no reverse battery protection | Better suited for 5–30V input → 12V conversion where input never drops below 3V | Select LT1111CN8-12#PBF only if input stays >3V and reverse polarity risk is absent |
| MAX756CPA+ | Fixed 5V/adjustable output; 1.5V min start-up; no integrated low-battery comparator or reverse protection | Lower cost for 5V-only systems; lacks auxiliary gain block and robust reverse-voltage handling | Choose MAX756CPA+ only for cost-sensitive 5V applications without battery monitoring or reversal exposure |
Compared with LT1111CN8-12#PBF and MAX756CPA+, the LT1110CN8-12#PBF uniquely combines single-cell start-up (1.0V), reverse battery tolerance (–1.6V), and on-chip low-battery detection - making it the sole option for ruggedized, ultra-low-power 12V generation in portable instruments and pagers.
Availability
LT1110CN8-12#PBF is available at Aetrix Electronics and suitable for pagers, single-cell to 12V converters, and battery backup supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1110CN8-12#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LT1110 product line was designed for ultra-low-power DC-DC conversion in battery-critical portable electronics, emphasizing micropower operation, wide input range, and integrated protection features - not general-purpose power management.
FAQ
What is the minimum input voltage required for LT1110CN8-12#PBF to start regulation?
The LT1110CN8-12#PBF starts regulation at 1.0V input, verified across temperature and load. This enables direct operation from a single depleted alkaline or NiMH cell. Below 1.0V, the internal oscillator and reference do not activate, so no output is generated. The 1.0V specification is guaranteed over the full 0°C to 70°C operating range per the Absolute Maximum Ratings table.
Does LT1110CN8-12#PBF require external feedback resistors to set the 12V output?
No, the LT1110CN8-12#PBF does not require external feedback resistors. Its FB/SENSE pin (Pin 8) connects internally to a precision resistor network calibrated for 12V output (11.4–12.6V). Only three external components - inductor, output capacitor, and Schottky diode - are needed to build a complete 12V converter, as confirmed in the Applications section and Typical Performance Characteristics.
How does the ILIM pin function on LT1110CN8-12#PBF, and what resistor value sets 400mA switch current?
The ILIM pin (Pin 1) programs the LT1110CN8-12#PBF's switch current limit by sensing voltage drop across an external resistor tied between ILIM and VIN. A 220Ω resistor sets the limit to approximately 400mA, as explicitly stated in the Applications section and Electrical Characteristics table. This feature prevents inductor saturation and switch overstress when input voltage rises, and is validated across temperature in the Typical Performance Characteristics curves.
Can LT1110CN8-12#PBF be used in step-down (buck) mode, and what is the maximum input voltage allowed?
Yes, the LT1110CN8-12#PBF supports step-down operation with a maximum input voltage of 36V in buck mode, per the Absolute Maximum Ratings table. In this configuration, SW1 connects to VIN and SW2 drives the inductor. Output voltage remains fixed at 12V, and efficiency exceeds 85% at 250mA with proper component selection - as demonstrated in the Step-Down Mode Operation section and Typical Performance graphs.
What is the guaranteed output voltage tolerance for LT1110CN8-12#PBF over temperature and load?
The LT1110CN8-12#PBF guarantees a 12V output within ±5% (11.4V to 12.6V) over the full 0°C to 70°C operating temperature range and across all load conditions, as specified in the Electrical Characteristics table under "VOUT, LT1110-12 (Note 2)". This tolerance includes line, load, and temperature effects - no additional derating is required for design-in.
LT1110CN8-12#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 70kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1110CN8-12#PBF FAQ
1.How can I place an order for LT1110CN8-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1110CN8-12#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 LT1110CN8-12#PBF reliable?
The price and inventory of LT1110CN8-12#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1110CN8-12#PBF is usually 5 days.
3.What payment methods are accepted for LT1110CN8-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1110CN8-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1110CN8-12#PBF?
LT1110CN8-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1110CN8-12#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 LT1110CN8-12#PBF?
For technical support, including LT1110CN8-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1110CN8-12#PBF requirements.
6.How does Aetrix verify that LT1110CN8-12#PBF is sourced from the original manufacturer or authorized distributors?
All LT1110CN8-12#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 LT1110CN8-12#PBF meets industry standards.
7.What is the process for return or replacement of LT1110CN8-12#PBF?
All LT1110CN8-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1110CN8-12#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 LT1110CN8-12#PBF part is unused and in its original packaging.
Return procedure for LT1110CN8-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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