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Analog Devices Inc. LT1110CS8#TRPBF
- Part No.:
- LT1110CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1110CS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,877
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Product details
Overview
LT1110CS8#TRPBF from Analog Devices is a micropower gated-oscillator DC-DC converter supporting step-up and step-down topologies with fixed 5V or 12V output options. It operates from 1.0V to 30V input, delivers up to 1.5A switch current, features on-chip 220mV reference and auxiliary gain block, and targets single-cell battery-powered systems such as pagers and portable instruments.
For engineers reviewing the LT1110CS8#TRPBF datasheet, LT1110CS8#TRPBF pinout, LT1110CS8#TRPBF application, or LT1110CS8#TRPBF equivalent, key selection criteria include minimum 1.0V start-up voltage, user-adjustable current limit via ILIM pin, 70kHz oscillator frequency, reverse-battery protection to –1.6V, and compatibility with surface-mount inductors and low-ESR tantalum/OS-CON output capacitors.
Technical Context
The LT1110CS8#TRPBF implements a gated-oscillator architecture where the 70kHz oscillator activates only when FB voltage falls below the internal 220mV comparator threshold, enabling ultra-low 300µA quiescent current in standby. Its adaptive base drive ensures NPN power switch (Q1) saturation without overdrive, optimizing efficiency across input ranges.
Switch configuration is topology-dependent: in step-up mode, SW1 drives the inductor while SW2 connects to GND; in step-down mode, SW1 ties to VIN and SW2 drives the inductor. The on-chip auxiliary gain block (A2) functions as a low-battery detector or linear post-regulator, with AO output sinking 300µA and SET pin referenced to the same 220mV internal reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.0V to 30V (step-up), 3.0V to 36V (step-down); enables single alkaline/ NiMH cell operation down to 1.0V |
| Output Voltage Options | Fixed 5V (±5%) or 12V (±5%) versions; adjustable via external resistor divider on FB pin |
| Switch Current Limit | Internally set to 1.5A; user-adjustable down to ~400mA using resistor between ILIM and VIN |
| Oscillator Frequency | 70kHz typical (52–90kHz range); supports compact surface-mount inductors and reduces EMI vs higher-frequency alternatives |
| Quiescent Current | 300µA (switch off); enables multi-year battery life in remote, low-duty-cycle applications |
| Reverse Battery Protection | Limits reverse current to safe levels at –1.6V applied to GND/SW2 pins; prevents damage during battery insertion errors |
| Operating Temperature | 0°C to 70°C ambient; validated for commercial-grade portable electronics environments |
Pinout & Package
LT1110CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package, measuring 5.0mm × 6.2mm × 1.75mm, with standard JEDEC MS-012AC footprint and gull-wing leads compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit programming input | Resistor between ILIM and VIN sets switch current trip point; 220Ω yields ~400mA limit |
| VIN (Pin 2) | Main power supply input | Accepts 1.0V–30V (step-up) or 3.0V–36V (step-down); powers internal circuitry and switch driver |
| SW1 (Pin 3) | Collector of internal NPN power switch | In step-up: connects to inductor/diode node; in step-down: ties directly to VIN |
| SW2 (Pin 4) | Emiter of internal NPN power switch | In step-up: connects to GND; in step-down: drives inductor; must not fall below –0.5V |
| GND (Pin 5) | Analog and power ground reference | Common return for feedback, gain block, and oscillator; requires low-impedance PCB connection |
| AO (Pin 6) | Auxiliary gain block open-collector output | Sinks 300µA; used for low-battery detection or UVLO signaling; requires external pull-up |
| SET (Pin 7) | Inverting input of auxiliary gain block (A2) | Connected to resistor divider from VIN; trip point set by ratio relative to internal 220mV reference |
| FB/SENSE (Pin 8) | Feedback/comparator input | On LT1110 (adjustable): connects to resistor divider; on LT1110-5/-12: internally connected to precision divider |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator control | Enables 300µA quiescent current by disabling oscillator and high-current circuitry when regulation is satisfied |
| On-chip 220mV reference | Stable, temperature-compensated reference shared by comparator and auxiliary gain block for consistent trip points |
| User-programmable current limit | Single external resistor on ILIM pin adjusts switch current from 400mA to 1.5A, preventing inductor saturation and switch overstress |
| Reverse battery protection | Guaranteed operation with –1.6V applied to GND/SW2 pins while other pins are grounded, eliminating need for external diode |
| Integrated auxiliary gain block | Configurable op-amp (A2) with 220mV reference input enables low-battery detection, linear post-regulation, or UVLO without external ICs |
Applications
| Pagers | Cameras |
|---|---|
Use Scenario: Compact handheld paging device powered by single AA/AAA alkaline cell with tight space constraints and multi-month battery life requirement. IC Role / Device Role / Timing Role: Step-up DC-DC controller generating stable 5V rail from 1.0–1.5V cell voltage; manages energy transfer via gated 70kHz oscillator. Use Value: 300µA quiescent current extends battery life; 1.0V minimum start-up ensures full utilization of cell capacity; reverse-battery protection guards against user insertion errors. | Use Scenario: Digital still camera with flash LED requiring regulated 5V supply from two-series NiMH cells (2.0–2.8V). IC Role / Device Role / Timing Role: Step-up converter delivering 5V at up to 250mA; uses internal gain block to monitor battery voltage and disable flash when below threshold. Use Value: On-chip AO output signals microcontroller for battery warning; adjustable current limit prevents inductor saturation during high-current flash pulses. |
| Single-Cell to 5V Converters | Portable Instruments |
Use Scenario: Handheld multimeter or gas detector powered by one 1.5V alkaline cell needing clean, regulated 5V for MCU and analog front-end. IC Role / Device Role / Timing Role: Fixed-output LT1110CS8#TRPBF-5 configured as single-inductor boost converter; FB pin internally tied to precision resistor network. Use Value: Only three external components required (inductor, diode, capacitor); 90mV typical output ripple meets analog measurement noise requirements; 70kHz switching avoids audible noise. | Use Scenario: Battery-operated portable oscilloscope or spectrum analyzer requiring dual-rail supplies and long runtime. IC Role / Device Role / Timing Role: Dual converter: one LT1110CS8#TRPBF-5 for +5V, another in inverting configuration for –5V rail; gain block monitors main battery for low-voltage shutdown. Use Value: Positive-to-negative conversion eliminates need for separate negative supply IC; reverse-battery protection safeguards sensitive analog signal paths during field maintenance. |
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 |
|---|---|---|---|
| MAX630CPA+ | Fixed 5V output only; 1.5V min input; 100kHz oscillator; no ILIM pin or reverse-battery protection | Lacks programmable current limit and reverse-polarity safeguard; less flexible for wide-input or fault-tolerant designs | Choose MAX630CPA+ only if fixed 5V output and minimal BOM count are primary goals and reverse polarity risk is mitigated externally |
| TPS61200DRCR | Adjustable output (1.2–5.5V); 0.3V min input; 500kHz switching; integrated synchronous rectifier; no auxiliary gain block | Higher efficiency at light loads due to synchronous design; lacks on-chip comparator/gain block for battery monitoring | Choose TPS61200DRCR when ultra-low input voltage (<1.0V) or higher efficiency (>85% at 10mA) is critical, and external battery monitoring is acceptable |
Compared with MAX630CPA+ and TPS61200DRCR, the LT1110CS8#TRPBF uniquely combines sub-1V start-up, programmable current limiting, reverse-battery protection, and an integrated auxiliary gain block - enabling fewer external components and enhanced system-level fault resilience in single-cell portable devices.
Availability
LT1110CS8#TRPBF is available at Aetrix Electronics and suitable for pagers, portable instruments, single-cell to 5V converters, and battery backup supplies requiring stable component supply across extended production lifecycles.
Supply support for LT1110CS8#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 consumer markets.
The LT1110CS8#TRPBF belongs to Analog Devices' legacy micropower DC-DC converter product line, designed specifically for ultra-low-voltage, battery-constrained portable electronics where minimal quiescent current and robust fault handling are essential.
FAQ
What is the minimum input voltage required for LT1110CS8#TRPBF to start switching?
The LT1110CS8#TRPBF guarantees operation down to 1.0V input voltage in step-up mode, enabling full utilization of single alkaline or NiMH cells until depletion. This 1.0V minimum is specified across the full 0°C to 70°C operating temperature range and is validated by the gated-oscillator architecture that activates only when FB drops below 220mV.
Can LT1110CS8#TRPBF be used in step-down (buck) configuration?
Yes, the LT1110CS8#TRPBF supports step-down operation with input voltages from 3.0V to 36V. In buck mode, SW1 connects to VIN and SW2 drives the inductor. Output voltage is set by the same FB resistor divider equation, but maximum recommended output is 6.2V without external diode; higher outputs require series Schottky diode on SW2.
How does the ILIM pin on LT1110CS8#TRPBF adjust switch current limit?
The ILIM pin on LT1110CS8#TRPBF accepts a resistor between itself and VIN to set the switch current trip point. A 220Ω resistor yields ~400mA limit; lower resistance increases current, up to the internal 1.5A maximum when ILIM is tied directly to VIN. The circuit uses internal sense transistor ratioing and 800ns response time for fast overcurrent shutdown.
What is the purpose of the AO and SET pins on LT1110CS8#TRPBF?
The AO (open-collector output) and SET (inverting input) pins form an auxiliary gain block (A2) referenced to the internal 220mV reference. This allows configurable low-battery detection (via resistor divider on SET), linear post-regulation, or UVLO signaling - with AO sinking 300µA to drive external logic or enable lines without additional op-amps.
Does LT1110CS8#TRPBF include reverse battery protection, and how does it work?
Yes, LT1110CS8#TRPBF includes unique reverse battery protection, guaranteeing safe operation with –1.6V applied to GND and SW2 pins while VIN, ILIM, and SW1 remain grounded. Internal circuitry limits reverse current to non-destructive levels, eliminating the need for external series diodes and preserving efficiency in battery-powered systems.
LT1110CS8#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 0.22V
- Voltage - Output (Max):
- 50V (Switch)
- 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#TRPBF FAQ
1.How can I place an order for LT1110CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1110CS8#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#TRPBF reliable?
The price and inventory of LT1110CS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1110CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1110CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1110CS8#TRPBF?
LT1110CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1110CS8#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#TRPBF?
For technical support, including LT1110CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1110CS8#TRPBF requirements.
6.How does Aetrix verify that LT1110CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1110CS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1110CS8#TRPBF?
All LT1110CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1110CS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LT1110CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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