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Analog Devices Inc. LT1054CS8#PBF
- Part No.:
- LT1054CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1054CS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ/2.5V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,886
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Product details
Overview
LT1054CS8#PBF from Analog Devices is a monolithic bipolar switched-capacitor voltage converter and regulator in an 8-lead plastic SOIC package. It delivers up to 100mA output current with typical voltage loss of 1.1V at 100mA across 3.5V–15V input, features internal 25kHz oscillator, external shutdown via FB/SHDN pin, and supports regulated negative voltage generation using external resistor divider. It is used in dual-rail power supplies for op-amp circuits requiring isolated negative bias.
For engineers reviewing the LT1054CS8#PBF datasheet, LT1054CS8#PBF pinout, LT1054CS8#PBF application, or LT1054CS8#PBF equivalent, key selection criteria include output current capability (100mA), regulated output stability under line/load variation, shutdown quiescent current (<100µA), oscillator synchronization capability, and compatibility with tantalum capacitor networks for low-ripple operation.
Technical Context
The LT1054CS8#PBF implements a charge-pump topology with adaptive bipolar switch drivers optimized for efficiency across 10mA–100mA load range. Its internal error amplifier compares feedback voltage against a 2.5V reference to regulate output by controlling PNP switch duty cycle, enabling stable negative voltage generation without inductors.
It integrates a 25kHz nominal oscillator with external frequency adjustment via OSC pin (Pin 7), supports parallel operation for higher current, and uses dedicated CAP+/CAP– pins (Pins 2/4) for bidirectional charge transfer between input and output capacitors - all while maintaining pin compatibility with LTC1044/ICL7660 in SO-8 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100mA max - sufficient for powering dual op-amp rails or analog front-end biasing. |
| Voltage Loss | 1.1V typ at 100mA - defines minimum input headroom required for target output magnitude. |
| Input Range | 3.5V to 15V - enables direct use from single 5V or 12V system rails. |
| Oscillator Freq | 25kHz nominal - balances switching loss vs. capacitor size; adjustable via external cap on Pin 7. |
| Reference Voltage | 2.5V ±0.15V - precision reference for feedback network; temperature-compensated for stable regulation. |
| Shutdown Current | <100µA - enables low-power sleep mode in battery-backed or intermittent-use systems. |
| Regulation Accuracy | ±50mV line/load regulation - ensures stable output under varying supply and load conditions. |
Pinout & Package
LT1054CS8#PBF is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC outline, 1.27mm pitch, and thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/SHDN (Pin 1) | Inverting input of error amplifier / shutdown control | Pulling below ≈0.45V disables switching and reference; also sets regulated output voltage via R1/R2 divider. |
| CAP+ (Pin 2) | Positive terminal of flying capacitor | Switched between V+ and GND to charge CIN; carries ~2.2× output current during charge phase. |
| GND (Pin 3) | Power and signal ground reference | Substrate tie point; VOUT (Pin 5) must never exceed this pin voltage to avoid substrate diode conduction. |
| CAP– (Pin 4) | Negative terminal of flying capacitor | Switched between GND and VOUT to transfer charge to COUT; unidirectional current flow per bipolar switch design. |
| VOUT (Pin 5) | Negative regulated output / substrate tie | Delivers inverted or doubled output; tied to die substrate - requires careful layout to prevent start-up failure. |
| VREF (Pin 6) | 2.5V precision reference output | Supplies feedback network; limited to ~60µA sink current; used as pull-up for OSC synchronization. |
| OSC (Pin 7) | Oscillator timing node | Internally connected to 150pF timing cap; accepts external caps to lower (C1 to GND) or raise (C2 to CAP+) frequency. |
| V+ (Pin 8) | Positive input supply | Source for charging CIN; peak input current ≈2.2×IOUT - requires ≥2µF low-ESR bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Enables stable negative output (e.g., –5V) without external error amp - only R1/R2 needed. |
| Adaptive switch driver | Maintains high efficiency across 10–100mA load range by optimizing drive strength dynamically. |
| External oscillator sync | Allows synchronization to system clock via open-collector drive on OSC pin - eliminates beat frequencies. |
| Low-loss charge pump | 1.1V typical voltage loss at 100mA reduces heat dissipation and improves usable input-output differential. |
| Pin-compatible upgrade | Direct replacement for LTC1044/ICL7660 in SO-8 layout - no PCB change required for migration. |
Applications
| Op-Amp Dual-Rail Supply | Portable Instrument Negative Bias |
|---|---|
Use Scenario: Generating –5V rail from +5V microcontroller supply to power rail-to-rail op-amps in handheld test equipment. IC Role / Device Role / Timing Role: Voltage inverter with regulation - converts single positive input into stable negative output referenced to system ground. Use Value: Eliminates need for separate negative supply IC or inductor-based DC/DC; maintains <±50mV regulation over 10–100mA load swing. | Use Scenario: Providing –12V bias for photodiode transimpedance amplifier in battery-powered optical sensor module. IC Role / Device Role / Timing Role: Regulated negative voltage doubler - generates precise –12V from 5V input using external R1/R2 feedback network. Use Value: Achieves 100mA output with 1.1V loss, enabling compact design with low-ESR tantalum capacitors instead of bulky inductors. |
| Bipolar Data Acquisition System | Legacy ICL7660 Replacement |
Use Scenario: Creating ±12V rails from 12V input for 16-bit ADC driver stage in industrial data logger with isolated analog front-end. IC Role / Device Role / Timing Role: Dual-mode converter - operates as inverter for negative rail and as doubler for positive rail in split-supply configuration. Use Value: Supports simultaneous ±12V generation with matched regulation performance and shared oscillator synchronization. | Use Scenario: Upgrading aging ICL7660-based power circuit in medical device where higher output current and tighter regulation are required. IC Role / Device Role / Timing Role: Pin-compatible functional upgrade - retains identical SO-8 footprint and external component values while improving voltage loss and regulation. Use Value: Delivers 100mA vs. ICL7660's ~20mA, reduces voltage loss by >50%, and adds shutdown and regulation capability without layout changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1044CS8#PBF | No internal regulation; fixed inverter/doubler only; 20mA max output; no shutdown pin. | Suitable only for unregulated, low-current inversion; cannot replace LT1054CS8#PBF in regulated designs. | Select only when regulation, shutdown, or >20mA output are unnecessary - lower cost but functionally limited. |
| MAX1044CPA+ | CMOS process; 20mA output; no internal reference; requires external op-amp for regulation. | Higher quiescent current (120µA); no integrated error amp - needs external components for regulation. | Choose only for legacy CMOS compatibility or where bipolar switching noise is unacceptable; not drop-in for LT1054CS8#PBF. |
Compared with LTC1044CS8#PBF and MAX1044CPA+, the LT1054CS8#PBF provides integrated regulation, 5× higher output current, and true shutdown - making it the sole option among the three for precision negative bias generation in space-constrained analog systems.
Availability
LT1054CS8#PBF is available at Aetrix Electronics and suitable for op-amp dual-rail supplies, portable instrument negative bias, and bipolar data acquisition systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for LT1054CS8#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 LT1054 product line was designed specifically for high-efficiency, inductorless DC/DC conversion in analog signal chains - emphasizing low-noise regulation, wide input range, and robust capacitor-driven topology for precision instrumentation.
FAQ
What is the maximum output current specification for LT1054CS8#PBF?
The LT1054CS8#PBF is rated for 100mA maximum continuous output current under specified conditions (CIN = COUT = 100µF tantalum, TJ ≤ 100°C). This value is confirmed in the Electrical Characteristics table and applies across its full 3.5V–15V input range. Exceeding 100mA may cause thermal shutdown or degraded regulation accuracy due to increased voltage loss and junction temperature rise.
Can LT1054CS8#PBF generate a regulated –5V output from a 5V input?
Yes, the LT1054CS8#PBF can generate a regulated –5V output from a 5V input using the standard feedback divider configuration shown in Figure 5 of the datasheet. With R1 = 20kΩ and R2 = 102.6kΩ, the LT1054CS8#PBF achieves –5.00V ±50mV regulation across line and load variations, leveraging its internal 2.5V reference and error amplifier.
Does LT1054CS8#PBF require external capacitors, and what type is recommended?
Yes, the LT1054CS8#PBF requires external flying (CIN) and output (COUT) capacitors. Solid tantalum capacitors are strongly recommended - minimum 10µF for CIN and 100µF for COUT - due to their low ESR, which minimizes voltage loss and ripple. Aluminum electrolytic types may be paralleled with tantalum for cost-sensitive designs, but ceramic capacitors alone are insufficient due to microphonic and ESR limitations.
How does the shutdown function work on LT1054CS8#PBF?
The LT1054CS8#PBF enters shutdown when the FB/SHDN pin (Pin 1) is pulled below ≈0.45V, reducing supply current to <100µA. During shutdown, the internal reference and oscillator disable, and switches discharge CIN/COUT through the load. A logic-low signal from an open-collector gate or microcontroller GPIO suffices - no additional circuitry is required for basic shutdown control.
Is LT1054CS8#PBF pin-compatible with LTC1044 or ICL7660 in SO-8 packages?
Yes, the LT1054CS8#PBF is fully pin-compatible with LTC1044CS8 and ICL7660 in 8-lead SOIC packages - identical pin numbering, function mapping, and footprint. This allows direct replacement without PCB modification, while adding regulation, higher output current, and shutdown capability absent in those legacy parts.
LT1054CS8#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:
- Ratiometric, Step-Up
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.5V (-Vin, 2Vin)
- Voltage - Output (Max):
- 30V
- Current - Output:
- 100mA
- Frequency - Switching:
- 25kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1054CS8#PBF FAQ
1.How can I place an order for LT1054CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054CS8#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 LT1054CS8#PBF reliable?
The price and inventory of LT1054CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1054CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054CS8#PBF?
LT1054CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054CS8#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 LT1054CS8#PBF?
For technical support, including LT1054CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054CS8#PBF requirements.
6.How does Aetrix verify that LT1054CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1054CS8#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 LT1054CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1054CS8#PBF?
All LT1054CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1054CS8#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 LT1054CS8#PBF part is unused and in its original packaging.
Return procedure for LT1054CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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