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Analog Devices Inc. LT1110CS8-12#TRPBF
- Part No.:
- LT1110CS8-12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1110CS8-12#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 12V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1110CS8-12#TRPBF from Analog Devices is a micropower DC-DC converter IC configured for fixed 12V step-up or step-down operation, featuring 1.0V minimum input voltage, 300µA quiescent current, and an internal 1A power switch. It delivers regulated 12V output with ±5% accuracy (11.4–12.6V) and supports single-cell battery inputs in portable instrumentation and backup supplies.
For engineers reviewing the LT1110CS8-12#TRPBF datasheet, LT1110CS8-12#TRPBF pinout, LT1110CS8-12#TRPBF application, or LT1110CS8-12#TRPBF equivalent, key selection criteria include its 70kHz gated-oscillator architecture, user-adjustable current limit via ILIM pin, reverse-battery protection to –1.6V, and compatibility with surface-mount inductors and low-ESR tantalum/OS-CON output capacitors.
Technical Context
The LT1110CS8-12#TRPBF implements a gated-oscillator switching architecture where the 70kHz oscillator activates only when FB voltage falls below the 220mV internal reference, enabling ultra-low 300µA quiescent current in standby. Its adaptive base drive ensures switch saturation without overdrive, optimizing efficiency across input ranges from 1.0V to 30V in step-up mode and up to 36V in step-down mode.
It integrates a dual-function auxiliary gain block (A2) with 220mV reference, configurable as low-battery detector or linear post-regulator, and features reverse-battery protection limiting destructive reverse current to ≤750mA at –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); enables direct replacement of 12V wall adapters in space-constrained battery-powered systems. |
| Input Voltage Range | 1.0V to 30V (step-up), 3.0V to 36V (step-down); supports single alkaline/ NiMH cell (≥1.0V) and wide industrial input rails. |
| Quiescent Current | 300µA typical with switch off; extends battery life in remote sensors and pagers requiring years of operation on primary cells. |
| Oscillator Frequency | 52–90kHz (typ. 70kHz); allows use of compact surface-mount inductors (e.g., 47µH Sumida CD54-470K) without ferrite core saturation. |
| Switch Current Limit | User-adjustable via ILIM-to-VIN resistor; 400mA with 220Ω, scalable to 1.5A max; prevents inductor saturation and MOSFET overstress during input transients. |
| Reverse Battery Protection | Withstands –1.6V on GND/SW2 pins continuously; eliminates need for external series diode, reducing forward drop and power loss in battery-reversal-prone handhelds. |
| Output Ripple | Typ. 200mV peak-to-peak with proper LC filter; reduced further using A2 gain block as pre-amplifier on FB pin for precision regulation. |
Pinout & Package
LT1110CS8-12#TRPBF uses an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant, tape-and-reel packaging. Pin 1 marked with dot; top-view orientation per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit programming input | Resistor between ILIM and VIN sets switch current threshold; 220Ω yields ~400mA limit, critical for inductor sizing and thermal management in step-down mode. |
| VIN (Pin 2) | Main power supply input | Accepts 1.0–30V (step-up) or 3.0–36V (step-down); connects directly to battery or rail; reverse-protection active only when GND/SW2 biased negative. |
| SW1 (Pin 3) | Collector of internal NPN power switch | In step-up: drives inductor anode; in step-down: tied to VIN; withstands 50V max, defining safe operating area during switching transitions. |
| SW2 (Pin 4) | Emiter of internal NPN power switch | In step-up: connected to GND; in step-down: drives inductor cathode; voltage excursion limited to –0.5V min, requiring Schottky catch diode. |
| GND (Pin 5) | Analog/digital ground reference | Common return for FB, SET, AO, and internal reference; must be low-impedance path to minimize noise coupling into 220mV comparator. |
| AO (Pin 6) | Auxiliary gain block open-collector output | Sinks 300µA max; used for low-battery flag (e.g., pull-up to 5V via 47kΩ) or linear post-regulation; requires 2MΩ feedback to SET for stability. |
| SET (Pin 7) | Auxiliary gain block non-inverting input | Connected to resistor divider from VIN to GND to set low-battery trip point; internal 220mV reference on inverting input enables precise threshold control. |
| FB/SENSE (Pin 8) | Feedback input for output regulation | On LT1110CS8-12#TRPBF: connects internally to fixed-resistor network setting 12V output; no external divider needed-reduces BOM count and layout area. |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator topology | Enables 300µA quiescent current by disabling high-current circuitry (oscillator, driver, Q1) when FB ≥ 220mV-critical for >5-year battery life in IoT sensors. |
| Integrated 1A NPN power switch | Eliminates need for external transistor in most 12V/100–200mA applications, reducing PCB area and component count versus controller-only solutions. |
| On-chip 220mV precision reference | Stable over temperature (±2mV drift from –50°C to +100°C); serves both FB regulation and A2 comparator, ensuring consistent 12V output and low-battery detection thresholds. |
| Adjustable current limit via ILIM pin | Permits optimization of inductor size and efficiency across wide input ranges (e.g., 1.5V–12V); prevents destructive current runaway during cold-start or load dump events. |
| Reverse-battery protection | Guaranteed operation at –1.6V on GND/SW2 with VIN grounded; removes requirement for series Schottky diode, saving 0.3V dropout and 100mW dissipation in 300mA systems. |
Applications
| Portable Medical Sensors | Single-Cell to 12V Instrumentation |
|---|---|
Use Scenario: Powering 12V analog front-ends (op-amps, ADCs) in handheld blood glucose meters or pulse oximeters powered by a single AA alkaline cell. IC Role / Device Role / Timing Role: Step-up DC-DC converter generating stable 12V from 1.0–1.5V battery input; regulates via FB pin using internal 12V divider; gated oscillator minimizes idle current. Use Value: Enables use of high-precision 12V signal chains without bulky external regulators; 300µA IQ extends single-AA runtime to >2 years in intermittent-read devices. | Use Scenario: Providing isolated 12V bias for photomultiplier tubes or laser diodes in field-deployable environmental analyzers. IC Role / Device Role / Timing Role: Fixed-output step-up converter with reverse-battery protection; SW2 tied to GND, SW1 driving 47µH inductor and MBRS120T3 Schottky; AO pin monitors battery health. Use Value: Eliminates risk of damage from accidental battery reversal in unattended deployments; 12V output ripple <200mV ensures low-noise analog signal integrity. |
| Laptop Backup Memory Supply | Handheld Inventory Computers |
Use Scenario: Maintaining SRAM data during main power loss in ruggedized laptops using coin-cell backup. IC Role / Device Role / Timing Role: Step-down converter accepting 12–19V main rail to generate 12V for memory retention; ILIM resistor limits inrush during brownout recovery. Use Value: Supports fast switchover (<10µs) from main to backup power; reverse-protection prevents coin-cell discharge when main rail is disconnected. | Use Scenario: Powering 12V barcode scanners and display backlights in warehouse inventory scanners running on rechargeable Li-ion packs. IC Role / Device Role / Timing Role: Step-up converter boosting 3.0–4.2V battery to 12V; uses AO pin to trigger MCU low-battery interrupt at 3.2V; S8 package fits 10mm × 10mm PCB area. Use Value: Reduces bill-of-materials by integrating switch, reference, and detector; 8-pin SOIC simplifies automated assembly versus DIP alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1983ES6-12#TRMPBF | Higher 2.5MHz switching frequency; 1.8V min input; integrated Schottky; 120mA max output. | Better suited for ultra-compact, low-noise applications (e.g., RF modules); lower output current limits use in high-power 12V loads. | Select LTC1983 for space-constrained designs needing <1mm² inductor footprint; avoid if >150mA 12V load or sub-1.5V input required. |
| TPS61040DRVR | 500kHz fixed-frequency; 0.9V min input; 28V max SW pin; adjustable output; 400mA switch current. | Requires external feedback resistors for 12V; lacks reverse-battery protection; higher IQ (55µA vs 300µA) but faster transient response. | Choose TPS61040 for cost-sensitive, high-volume consumer electronics where reverse protection is handled externally; not recommended for single-cell medical devices. |
Compared with LTC1983ES6-12#TRMPBF and TPS61040DRVR, LT1110CS8-12#TRPBF offers superior ultra-low-input-voltage operation (1.0V), integrated reverse-battery protection, and proven reliability in long-life battery systems-making it optimal for medical, industrial, and backup power applications where robustness and longevity outweigh raw efficiency metrics.
Availability
LT1110CS8-12#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, single-cell instrumentation, and laptop backup supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1110CS8-12#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and conversion technologies.
The LT1110 product line was designed for ultra-low-power, wide-input-voltage DC-DC conversion in battery-critical applications-including pagers, handheld instruments, and backup systems-where minimal quiescent current and robust fault protection are mandatory.
FAQ
What is the minimum input voltage supported by the LT1110CS8-12#TRPBF?
The LT1110CS8-12#TRPBF supports a minimum input voltage of 1.0V in step-up mode, enabling operation directly from a single discharged alkaline or NiMH cell. This specification is guaranteed over the full 0°C to 70°C operating temperature range and is critical for extending runtime in battery-powered portable instruments. Below 1.0V, regulation cannot be maintained.
Does the LT1110CS8-12#TRPBF require external feedback resistors to set the 12V output?
No, the LT1110CS8-12#TRPBF does not require external feedback resistors. It is a fixed-output variant with on-chip resistor network connecting FB/SENSE (Pin 8) to the internal 220mV reference, guaranteeing 12.0V ±5% (11.4–12.6V) output. This eliminates two external components and associated layout sensitivity, distinguishing it from the adjustable LT1110 base part.
How does the ILIM pin function in the LT1110CS8-12#TRPBF?
The ILIM pin (Pin 1) on the LT1110CS8-12#TRPBF allows user-adjustable current limiting by connecting a resistor between ILIM and VIN. A 220Ω resistor sets the switch current limit to ~400mA; tying ILIM directly to VIN enables the full 1.5A rating. This feature prevents inductor saturation and thermal overload during input voltage surges or short-circuit conditions.
Can the LT1110CS8-12#TRPBF be used in step-down (buck) configuration?
Yes, the LT1110CS8-12#TRPBF supports step-down operation with input voltages from 3.0V to 36V, delivering fixed 12V output. In buck mode, SW1 connects to VIN and SW2 drives the inductor. Output voltage remains regulated at 12V, but efficiency and maximum load current are lower than in step-up mode due to higher switch conduction losses at elevated inputs.
What protection features does the LT1110CS8-12#TRPBF include against reverse battery connection?
The LT1110CS8-12#TRPBF includes 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 eliminates the need for an external series diode, preserving system efficiency and simplifying design for handheld devices prone to incorrect battery insertion.
LT1110CS8-12#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):
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1110CS8-12#TRPBF FAQ
1.How can I place an order for LT1110CS8-12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1110CS8-12#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 LT1110CS8-12#TRPBF reliable?
The price and inventory of LT1110CS8-12#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1110CS8-12#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1110CS8-12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1110CS8-12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1110CS8-12#TRPBF?
LT1110CS8-12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1110CS8-12#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 LT1110CS8-12#TRPBF?
For technical support, including LT1110CS8-12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1110CS8-12#TRPBF requirements.
6.How does Aetrix verify that LT1110CS8-12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1110CS8-12#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 LT1110CS8-12#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1110CS8-12#TRPBF?
All LT1110CS8-12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1110CS8-12#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 LT1110CS8-12#TRPBF part is unused and in its original packaging.
Return procedure for LT1110CS8-12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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