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Analog Devices Inc. LT1054CS8#TRPBF
- Part No.:
- LT1054CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1054CS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ/2.5V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,972
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Product details
Overview
LT1054CS8#TRPBF from Analog Devices is a monolithic bipolar switched-capacitor voltage converter and regulator in an 8-lead SOIC package. It delivers up to 100mA output current with 1.1V typical voltage loss at 100mA, operates from 3.5V to 15V input, features internal 25kHz oscillator, and supports regulated negative voltage generation via external resistor divider. It is used in dual-rail power supplies for op-amp circuits requiring clean, isolated negative rails.
For engineers reviewing the LT1054CS8#TRPBF datasheet, LT1054CS8#TRPBF pinout, LT1054CS8#TRPBF application, or LT1054CS8#TRPBF equivalent, key selection criteria include regulated inverter capability, shutdown control via FB/SHDN pin, oscillator synchronization support, low quiescent current (2.5mA), and compatibility with tantalum input/output capacitors in space-constrained industrial and test equipment designs.
Technical Context
The LT1054CS8#TRPBF implements a charge-pump topology with adaptive switch driver circuitry that maintains efficiency across 10mA–100mA load range. Its internal error amplifier compares feedback voltage against a 2.5V reference to regulate output, enabling stable negative voltage generation independent of input variation.
It integrates a 25kHz oscillator with external synchronization capability via OSC pin, and uses bipolar switching transistors with unidirectional current flow on CAP+ and CAP− terminals. The S8-package variant uses a dedicated die optimized for SOIC thermal and layout constraints, requiring matched CIN/COUT nominal values for reliable regulation at elevated junction temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100mA maximum - sufficient for powering dual op-amp rails or small analog signal chains without external pass devices. |
| Voltage Loss | 1.1V typical at 100mA - defines minimum input-to-output headroom required for target regulated output (e.g., −5V needs ≥6.1V input). |
| Input Range | 3.5V to 15V - supports wide-input industrial supplies and battery-backed systems down to single Li-ion cell. |
| Oscillator Frequency | 25kHz nominal - balances switching loss vs. capacitor size; adjustable via external capacitor or synchronizable to system clock. |
| Reference Voltage | 2.5V ±0.15V - precision internal reference enables accurate regulation of −5V, −12V, or other negative outputs using standard 1% resistors. |
| Shutdown Current | <100µA - enables ultra-low-power standby in portable instrumentation where intermittent operation is required. |
| Quiescent Current | 2.5mA typical - determines no-load power draw in always-on bias rails for sensors or interface ICs. |
Pinout & Package
LT1054CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC dimensions (4.9mm × 6.0mm, 1.27mm pitch). Thermal resistance θJA = 120°C/W enables 100mA operation at ≤70°C ambient with minimal PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB/SHDN) | Feedback input / shutdown control | Pull below ≈0.45V to disable switching and reduce supply current to <100µA; also serves as inverting input for regulation loop. |
| 2 (CAP+) | Positive terminal of flying capacitor | Switched between V+ and GND; carries bidirectional charge-transfer current ≈2.2× IOUT during charging phase. |
| 3 (GND) | Ground reference | Substrate tie point; all voltages referenced here; VOUT must never exceed GND to avoid substrate diode conduction. |
| 4 (CAP−) | Negative terminal of flying capacitor | Switched between GND and VOUT; completes charge transfer path; polarity critical for inverter/doubler configuration. |
| 5 (VOUT) | Regulated negative output | Also tied to substrate; requires external transistor buffer when driving loads referenced to positive supply (e.g., op-amp V− pins). |
| 6 (VREF) | 2.5V reference output | Supplies feedback divider; limited to ≈60µA; temperature-compensated to minimize drift in regulated output voltage. |
| 7 (OSC) | Oscillator timing/synchronization | Internally drives ≈150pF capacitor; accepts external cap for frequency tuning or open-collector sync signal for system-level timing alignment. |
| 8 (V+) | Positive input supply | Source for charge pump; peak input current ≈2.2× IOUT; requires ≥2µF low-ESR bypass capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Enables precise negative voltage generation (e.g., −5.00V ±20mV) without external error amplifier or reference IC. |
| Adaptive switch driver | Maintains <1.6V voltage loss from 10mA to 100mA, eliminating need for dynamic compensation in varying load applications. |
| External shutdown | Reduces total system standby power by disabling internal oscillator, reference, and switching - critical for battery-powered DMMs and data loggers. |
| Oscillator synchronization | Allows noise-sensitive mixed-signal systems (e.g., ADC front-ends) to align switching edges with quiet time slots, reducing EMI coupling. |
| Pin compatibility | Direct replacement for LTC1044 and ICL7660 in existing SO-8 layouts, enabling drop-in upgrade to higher current and regulated performance. |
Applications
| Op-Amp Dual-Rail Supply | Portable Instrumentation Bias |
|---|---|
Use Scenario: Generating ±12V rails from a single 12V battery for rail-to-rail op-amps in handheld oscilloscopes. IC Role / Device Role / Timing Role: LT1054CS8#TRPBF acts as regulated negative voltage inverter, providing stable −12V output synchronized to system clock to suppress switching noise in analog front-end. Use Value: Eliminates need for discrete regulators and transformers, reducing BOM count by 4 components while maintaining 10mV load regulation over 1–100mA. |
Use Scenario: Powering low-noise instrumentation amplifiers in battery-operated strain gauge conditioners. IC Role / Device Role / Timing Role: LT1054CS8#TRPBF serves as shutdown-controllable negative supply, activated only during measurement bursts to extend 200mAh coin-cell life beyond 1 year. Use Value: Achieves <100µA shutdown current and 1.1V voltage loss at 25mA, enabling 16-bit ADC resolution without ground-loop induced offset drift. |
| Industrial Sensor Interface | Test Equipment Auxiliary Rail |
Use Scenario: Providing isolated −5V bias for current-loop transmitters in 4–20mA field instruments operating from 24V DC supply. IC Role / Device Role / Timing Role: LT1054CS8#TRPBF functions as non-isolated regulated inverter with external R1/R2 divider set to −5.00V, rejecting input ripple up to 2VPP. Use Value: Delivers 50ppm/°C output stability over −40°C to +85°C, meeting IEC 61000-6-2 immunity requirements for factory-floor deployment. |
Use Scenario: Creating programmable negative bias for DAC output stages in automated test equipment requiring ±10V compliance. IC Role / Device Role / Timing Role: LT1054CS8#TRPBF operates as externally synchronized doubler/inverter pair, with OSC pins locked to 1MHz master clock to prevent beat-frequency artifacts. Use Value: Enables 100mA peak current delivery with <20mV line/load regulation, supporting fast settling (<10µs) for 1MSPS waveform generation. |
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 only; 50mA max output; 2.5V voltage loss at 50mA. | Suitable for unregulated −VIN generation only; cannot implement feedback-based voltage setting. | Select when cost sensitivity outweighs regulation need and output current ≤50mA. |
| MAX680CPA+ | CMOS process; 100mA output; no internal reference; requires external op-amp for regulation; 20kHz oscillator. | Requires additional ICs for regulation; higher ESR tolerance but lower PSRR than LT1054CS8#TRPBF. | Select when board space allows extra components and bipolar noise immunity is not required. |
Compared with LTC1044CS8#PBF and MAX680CPA+, the LT1054CS8#TRPBF provides integrated regulation, lower voltage loss, and direct pin compatibility - making it optimal for space-constrained, regulated negative rail designs where component count and thermal performance are critical.
Availability
LT1054CS8#TRPBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable instrumentation bias, op-amp dual-rail supplies, and test equipment auxiliary rails requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LT1054CS8#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 since 1965.
The LT1054 product line was designed specifically for high-current, regulated switched-capacitor power conversion in space- and noise-sensitive analog systems - emphasizing low voltage loss, integrated reference accuracy, and robust thermal behavior in plastic packages.
FAQ
What is the maximum output current of the LT1054CS8#TRPBF?
The LT1054CS8#TRPBF delivers up to 100mA continuous output current in inverter configuration with 3.5V to 15V input. This rating assumes proper thermal management (≤100°C junction temperature), 100µF tantalum output capacitor, and operation within specified voltage loss limits. At 100mA, typical voltage loss is 1.1V, meaning a 12V input yields approximately −10.9V output before regulation adjustment.
How does the LT1054CS8#TRPBF achieve regulated output voltage?
The LT1054CS8#TRPBF achieves regulation using its internal 2.5V reference (Pin 6) and error amplifier (FB/SHDN Pin 1). An external resistor divider connects VOUT to FB/SHDN and GND, setting the regulated output according to VOUT = −VREF × (1 + R2/R1). The device continuously adjusts switch duty cycle to maintain this ratio, rejecting variations in input voltage and load current.
Can the LT1054CS8#TRPBF be synchronized to an external clock?
Yes, the LT1054CS8#TRPBF supports external oscillator synchronization via Pin 7 (OSC). A pull-up resistor (20kΩ recommended) connects OSC to VREF, and an open-collector gate or NPN transistor drives OSC low at the desired system clock frequency. This feature reduces beat frequencies and EMI in mixed-signal systems where timing coherence is critical for measurement integrity.
What capacitor types are recommended for LT1054CS8#TRPBF applications?
For LT1054CS8#TRPBF, solid tantalum capacitors are strongly recommended: 10µF–100µF for CIN and COUT, with low ESR (≤1Ω). Aluminum electrolytics may be paralleled with tantalum for cost-sensitive designs, but ceramic capacitors are unsuitable due to microphonic effects and voltage coefficient issues. In S8-package regulator circuits, CIN and COUT nominal values must be equal for stable operation above 85°C junction temperature.
Is the LT1054CS8#TRPBF pin-compatible with older converters?
Yes, the LT1054CS8#TRPBF is pin-compatible with the LTC1044 and ICL7660 in SO-8 packages. All eight pins share identical functions and placement, allowing direct replacement in legacy designs. However, the LT1054CS8#TRPBF adds regulation capability, higher output current (100mA vs. 20mA), and lower voltage loss - delivering measurable performance uplift without PCB redesign.
LT1054CS8#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:
- 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#TRPBF FAQ
1.How can I place an order for LT1054CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054CS8#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 LT1054CS8#TRPBF reliable?
The price and inventory of LT1054CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1054CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054CS8#TRPBF?
LT1054CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054CS8#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 LT1054CS8#TRPBF?
For technical support, including LT1054CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054CS8#TRPBF requirements.
6.How does Aetrix verify that LT1054CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1054CS8#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 LT1054CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1054CS8#TRPBF?
All LT1054CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1054CS8#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 LT1054CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1054CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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