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Analog Devices Inc. LT1110CS8#PBF
- Part No.:
- LT1110CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1110CS8#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:255
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Product details
Overview
LT1110CS8#PBF from Analog Devices is a micropower gated-oscillator DC-DC converter in 8-lead SOIC package, operating from 1.0V to 30V input, delivering fixed 5V or 12V output with 300µA quiescent current and internal 1A power switch. It supports step-up and step-down topologies and integrates an on-chip auxiliary gain block for low-battery detection in single-cell battery-powered instrumentation.
For engineers reviewing the LT1110CS8#PBF datasheet, LT1110CS8#PBF pinout, LT1110CS8#PBF application, or LT1110CS8#PBF equivalent, key selection criteria include minimum 1.0V start-up voltage, user-adjustable switch current limit via ILIM pin, 70kHz oscillator frequency enabling compact surface-mount magnetics, and reverse-battery protection up to –1.6V on SW2/GND pins.
Technical Context
The LT1110CS8#PBF uses a gated-oscillator architecture where the 70kHz oscillator activates only when FB/SENSE voltage falls below the 220mV internal reference, minimizing quiescent current to 300µA. Its adaptive base drive ensures switch saturation without overdrive, improving efficiency across input ranges.
It features dual-mode operation: 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 integrated auxiliary gain block (A2) functions as a comparator with 220mV reference, supporting low-battery detection or linear post-regulation via AO open-collector output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.0V to 30V (step-up), up to 36V (step-down); enables single alkaline or NiMH cell start-up and wide industrial supply compatibility |
| Quiescent Current | 300µA (switch off); ensures multi-year battery life in remote sensors and portable instruments |
| Oscillator Frequency | 52–90kHz (typ. 70kHz); allows use of small, low-cost surface-mount inductors and capacitors |
| Switch Current Limit | User-adjustable via resistor from ILIM to VIN; 400mA with 220Ω, scalable to 1.5A max; prevents inductor saturation and switch overstress |
| Output Voltage Accuracy | ±5% for LT1110CS8#PBF-5 (4.75–5.25V), ±5% for LT1110CS8#PBF-12 (11.4–12.6V); ensures stable logic rail generation without external trimming |
| Reverse Battery Protection | Limits reverse current to safe levels at –1.6V applied to GND/SW2; eliminates need for external blocking diode in battery-reversal-prone designs |
| Operating Temperature | 0°C to 70°C; validated for commercial-grade embedded systems including handheld terminals and pagers |
Pinout & Package
LT1110CS8#PBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm footprint, 1.27mm pitch, RoHS-compliant and lead-free (PbF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit programming input | Resistor from ILIM to VIN sets switch current threshold; 220Ω yields ~400mA limit, critical for inductor sizing and thermal management |
| VIN (Pin 2) | Main power input | Accepts 1.0V–30V; supplies internal reference, oscillator, and driver circuits; must be decoupled near pin |
| SW1 (Pin 3) | Power switch collector | In step-up: connects to inductor/diode node; in step-down: ties directly to VIN; rated to 50V |
| SW2 (Pin 4) | Power switch emitter | In step-up: connects to GND; in step-down: drives inductor; must not go below –0.5V relative to GND |
| GND (Pin 5) | Analog and power ground | Common return for reference, comparator, and gain block; requires low-impedance PCB connection |
| AO (Pin 6) | Auxiliary gain block output | Open-collector comparator output sinking 300µA; used for low-battery flag or UVLO signaling to MCU |
| SET (Pin 7) | Auxiliary gain block inverting input | Connected to resistor divider from VIN; trip point set by ratio against internal 220mV reference |
| FB/SENSE (Pin 8) | Feedback/comparator input | On adjustable LT1110: connects to external resistor divider; on fixed -5/-12 versions: internal resistive divider sets output |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator topology | Enables 300µA quiescent current by disabling high-current circuitry when regulation is met, extending battery life in intermittent-load applications |
| Integrated auxiliary gain block (A2) | Provides configurable low-battery detection or linear post-regulation without external op-amp, reducing BOM count and board area |
| User-programmable switch current limit | Allows precise control of peak inductor current using one external resistor, preventing saturation and enabling consistent performance across input voltage range |
| Reverse battery protection | Guarantees safe operation with –1.6V applied to GND/SW2 pins, eliminating risk of destructive reverse-current flow in consumer battery compartments |
| Fixed-output variants (-5, -12) | Require only three external components (inductor, diode, capacitor) for complete 5V/12V conversion, accelerating design-in for standard rail generation |
Applications
| Pagers | Single-Cell to 5V Converters |
|---|---|
Use Scenario: Powering RF front-end and display logic in legacy two-way pagers with tight space and battery-life constraints. IC Role / Device Role / Timing Role: Step-up DC-DC controller generating stable 5V from 1.5V alkaline cell; manages switching timing via internal 70kHz gated oscillator. Use Value: 300µA quiescent current extends shelf life and operational runtime; reverse-battery protection avoids field failures from incorrect battery insertion. | Use Scenario: Converting voltage from a single AA/AAA cell (1.0–1.5V) to regulated 5V for microcontroller and sensor subsystems. IC Role / Device Role / Timing Role: Micropower boost converter with adaptive base drive; regulates output by gating 70kHz oscillator based on FB/SENSE feedback. Use Value: 1.0V minimum start-up enables full utilization of cell capacity; fixed 5V output version (LT1110CS8#PBF-5) achieves regulation with only inductor, Schottky diode, and output capacitor. |
| Battery Backup Supplies | Portable Instruments |
Use Scenario: Providing hold-up power during main supply interruption in industrial data loggers using supercapacitor or backup coin cell. IC Role / Device Role / Timing Role: Low-quiescent step-up controller maintaining 5V rail; uses AO pin to signal low-voltage condition to system supervisor IC. Use Value: 300µA IQ minimizes backup energy drain; auxiliary gain block provides accurate 220mV threshold detection for graceful shutdown sequencing. | Use Scenario: Powering analog front-ends and LCD displays in handheld multimeters and environmental sensors. IC Role / Device Role / Timing Role: Dual-mode DC-DC controller supporting both step-up (1.5V→5V) and step-down (9V→5V) configurations; SW1/SW2 pin roles reconfigured per topology. Use Value: Single-part flexibility reduces inventory; 8-lead SOIC package fits compact PCB layouts; 0°C–70°C rating covers handheld operating environments. |
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 |
|---|---|---|---|
| MAX756CPA+ | Fixed 5V output only; 100µA IQ; no ILIM pin or auxiliary gain block; requires external compensation | Lacks programmable current limit and low-battery detection; suited for simpler, ultra-low-IQ fixed-rail needs | Select MAX756CPA+ only when 100µA IQ is mandatory and auxiliary functions are unnecessary |
| TPS61200DRCR | Adjustable output (1.2–5.5V); 50µA IQ; integrated 1.3A switch; no reverse-battery protection | Higher efficiency at light loads; lacks reverse-protection and dedicated low-battery comparator output | Choose TPS61200DRCR for higher efficiency and adjustable output, but add external reverse-protection if required |
Compared with MAX756CPA+ and TPS61200DRCR, LT1110CS8#PBF uniquely combines 300µA IQ, user-adjustable current limiting, reverse-battery tolerance, and an integrated auxiliary comparator - making it optimal for cost-sensitive, battery-reversal-prone, single-cell instrument designs requiring multiple safety and monitoring functions in one SOIC package.
Availability
LT1110CS8#PBF is available at Aetrix Electronics and suitable for pagers, portable instruments, battery backup supplies, and single-cell-to-5V converters requiring stable component supply and long-term manufacturability.
Supply support for LT1110CS8#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 industrial, automotive, communications, and healthcare markets.
The LT1110CS8#PBF belongs to Analog Devices' micropower DC-DC converter product line, designed specifically for ultra-low-power, single-cell battery applications where start-up voltage, quiescent current, and functional integration are critical.
FAQ
What is the minimum input voltage required for LT1110CS8#PBF to start switching?
The LT1110CS8#PBF has a guaranteed minimum start-up voltage of 1.0V in step-up mode, enabling operation from nearly depleted alkaline or NiMH cells. This specification is validated across temperature and process corners, and the device maintains regulation down to this threshold with proper external component selection, including low-DCR inductor and low-ESR output capacitor.
Can LT1110CS8#PBF be used in step-down (buck) configuration, and what are the key layout considerations?
Yes, LT1110CS8#PBF supports step-down operation by connecting SW1 to VIN and SW2 to the inductor. Critical layout requirements include keeping the SW2–inductor–diode–GND loop area minimal to reduce EMI, using a Schottky diode (e.g., MBRS130T3) to prevent SW2 from falling below –0.5V, and routing the ILIM resistor close to Pin 1 to avoid noise-induced current-limit instability.
How does the ILIM pin on LT1110CS8#PBF adjust switch current limit, and what resistor value yields 800mA?
The ILIM pin sinks current proportional to switch current; adding a resistor between ILIM and VIN sets the trip point. For ~800mA limit, a 120Ω resistor is recommended based on the "Maximum Switch Current vs RLIM" curve in the LT1110CS8#PBF datasheet. This setting prevents inductor saturation under high-VIN conditions while maintaining efficiency across the input range.
Does LT1110CS8#PBF provide reverse battery protection, and how is it implemented?
Yes, LT1110CS8#PBF includes built-in reverse battery protection that limits reverse current to non-destructive levels when –1.6V is applied to GND and SW2 pins (with VIN, ILIM, and SW1 grounded). This is achieved through internal circuitry that clamps reverse conduction paths, eliminating the need for an external series diode and preserving forward-efficiency in battery-powered devices.
What is the function of the AO and SET pins on LT1110CS8#PBF, and how are they typically connected?
The AO pin is an open-collector output of the auxiliary gain block (A2), sinking up to 300µA; the SET pin is its inverting input, referenced internally to 220mV. Typically, a resistor divider from VIN to GND connects to SET to set the low-battery threshold, and a pull-up resistor (e.g., 47kΩ to 5V) connects to AO to generate a logic-low flag when VIN drops below the trip point - a configuration used in pagers and portable instruments for battery monitoring.
LT1110CS8#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):
- 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#PBF FAQ
1.How can I place an order for LT1110CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1110CS8#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 LT1110CS8#PBF reliable?
The price and inventory of LT1110CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1110CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1110CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1110CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1110CS8#PBF?
LT1110CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1110CS8#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 LT1110CS8#PBF?
For technical support, including LT1110CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1110CS8#PBF requirements.
6.How does Aetrix verify that LT1110CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1110CS8#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 LT1110CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1110CS8#PBF?
All LT1110CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1110CS8#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 LT1110CS8#PBF part is unused and in its original packaging.
Return procedure for LT1110CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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