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Analog Devices Inc. LT1054LCS8#TRPBF
- Part No.:
- LT1054LCS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1054LCS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ/2.5V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,894
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Product details
Overview
LT1054LCS8#TRPBF from Analog Devices is a monolithic bipolar switched-capacitor voltage converter and regulator in SO-8 package, delivering up to 125mA output current with 1.35V typical voltage loss at 125mA, operating from 3.5V to 7V input, and featuring internal 2.5V reference, external shutdown control via FB/SHDN pin, and 25kHz nominal oscillator frequency. It serves as a regulated negative voltage inverter in low-noise analog power rails.
For engineers reviewing the LT1054LCS8#TRPBF datasheet, LT1054LCS8#TRPBF pinout, LT1054LCS8#TRPBF application, or LT1054LCS8#TRPBF equivalent, this page delivers verified specifications, SO-8 terminal mapping, regulation design guidance, thermal derating data, and validated alternative options for bipolar supply generation and low-power negative rail synthesis.
Technical Context
The LT1054LCS8#TRPBF implements a charge-pump topology with adaptive bipolar switch drivers optimized for efficiency across 10mA–125mA load range. Its error amplifier compares feedback voltage against a trimmed 2.5V internal reference to regulate output by modulating PNP switch conduction.
It integrates a 25kHz oscillator with external synchronization capability via OSC pin, supports shutdown via FB/SHDN pin (threshold ≈0.45V), and uses CAP+/CAP– terminals to alternately charge and transfer charge between input and output capacitors - enabling inverter, doubler, and regulated configurations without inductors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 125mA max - sufficient for dual op-amp biasing or sensor signal conditioning rails |
| Voltage Loss | 1.35V typ at 125mA - defines minimum input-to-output differential required for regulation |
| Input Range | 3.5V to 7V - limits use to low-voltage systems; incompatible with >7V supplies |
| Oscillator Freq | 25kHz nominal - balances switching loss vs. capacitor size; adjustable via external caps |
| Reference Voltage | 2.5V ±0.15V - enables precise resistor-divider-based output regulation (e.g., –5V ±1%) |
| Shutdown Current | <200µA - enables ultra-low-power sleep mode in battery-operated instrumentation |
| Package | SO-8 - surface-mount compatible; θJA = 120°C/W; requires thermal relief on VOUT/GND pads |
Pinout & Package
LT1054LCS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad not present; thermal resistance θJA = 120°C/W. Pin numbering follows standard SO-8 top-view convention with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/SHDN (Pin 1) | Inverting input of error amp / shutdown control | Pull ≤0.45V to disable regulation and stop switching; open or pulled high for normal operation |
| CAP+ (Pin 2) | Positive side of flying capacitor | Switched between VIN and GND; carries ~2.2× output current during charge phase |
| GND (Pin 3) | Power and signal reference | Substrate tie point; VOUT must never exceed GND to avoid substrate diode forward bias |
| CAP– (Pin 4) | Negative side of flying capacitor | Switched between GND and VOUT; sources/sinks current to/from output capacitor |
| VOUT (Pin 5) | Regulated negative output | Tied to die substrate; requires external NPN transistor when driving op-amp loads referenced to positive rail |
| VREF (Pin 6) | 2.5V precision reference output | Supplies feedback divider; max 60µA load recommended to maintain accuracy |
| OSC (Pin 7) | Oscillator timing node | Accepts external cap for frequency tuning or open-collector sync signal |
| V+ (Pin 8) | Positive input supply | Input voltage source; bypass with ≥2µF low-ESR tantalum capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Enables stable negative output (e.g., –5V) across input and load variations without external LDO |
| External shutdown | Reduces quiescent current to <200µA - critical for portable medical sensors and IoT edge nodes |
| Pin compatibility | Direct replacement for LTC1044/ICL7660 in SO-8 footprint - simplifies legacy design upgrades |
| Adjustable oscillator | Frequency tuning via OSC pin allows EMI reduction or synchronization to system clock |
| Low-loss switching | 1.35V voltage loss at 125mA enables higher efficiency than prior-generation charge pumps |
Applications
| Instrumentation Power Supply | Portable Medical Sensor Bias |
|---|---|
Use Scenario: Generating isolated –5V rail for precision ADC front-end and low-noise op-amps in handheld multimeters. IC Role / Device Role / Timing Role: Regulated negative voltage inverter providing stable bias independent of battery discharge curve. Use Value: Maintains 0.1% reference stability over 3.5–7V input range and 1–125mA load, eliminating need for post-regulation LDO. | Use Scenario: Powering EEG electrode amplifiers and analog front-ends in battery-powered neuro-monitoring wearables. IC Role / Device Role / Timing Role: Low-quiescent-current negative rail generator with shutdown control synchronized to acquisition cycles. Use Value: Achieves <200µA shutdown current and 125mA burst-mode output, extending single-cell Li-ion life beyond 72 hours. |
| Bipolar Op-Amp Rail Generator | Strain Gauge Bridge Excitation |
Use Scenario: Creating ±12V rails from a 5V USB source for rail-to-rail op-amps in portable test equipment. IC Role / Device Role / Timing Role: Paired LT1054LCS8#TRPBF units configured as inverter (+12V) and regulator (–12V) with shared OSC sync. Use Value: Delivers matched ±12V outputs with <±50mV line/load regulation, enabling 16-bit DAC linearity without trimming. | Use Scenario: Providing low-noise, temperature-stable –5V excitation for Wheatstone bridge strain gauges in industrial load cells. IC Role / Device Role / Timing Role: Regulated negative reference source with 2.5V internal VREF used in ratiometric feedback network. Use Value: Compensates for bridge temperature drift via VREF's positive TC, achieving <50ppm/°C output voltage drift. |
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 regulator; no VREF pin; fixed 10kHz oscillator; 50mA max output | Requires external op-amp + reference for regulation; unsuitable for >50mA loads | Select only if regulation not needed and cost sensitivity outweighs performance loss |
| MAX680CPA+ | CMOS process; 100mA output; no shutdown; 10kHz oscillator; no VREF | Lacks shutdown and regulation features; higher voltage loss (2.2V at 100mA) | Choose only for non-critical, low-cost inverter-only designs with ample headroom |
Compared with LTC1044CS8#PBF and MAX680CPA+, the LT1054LCS8#TRPBF provides integrated regulation, 2.5× higher output current, 25kHz operation for smaller capacitors, and active shutdown - making it the sole option among the three capable of precision, low-power, regulated negative rail generation.
Availability
LT1054LCS8#TRPBF is available at Aetrix Electronics and suitable for instrumentation power supplies, portable medical sensor bias, bipolar op-amp rail generation, and strain gauge bridge excitation requiring stable component supply across extended production lifecycles.
Supply support for LT1054LCS8#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 precision instrumentation, industrial automation, and healthcare markets since 1965.
The LT1054 family was designed specifically for inductorless, regulated negative and doubled voltage generation in space-constrained analog systems - emphasizing low noise, thermal stability, and seamless integration with op-amp and ADC signal chains.
FAQ
What is the maximum input voltage rating for LT1054LCS8#TRPBF?
The absolute maximum supply voltage for LT1054LCS8#TRPBF is 7V, as specified in the Absolute Maximum Ratings table. Exceeding this voltage risks permanent damage. The device operates over 3.5V to 7V - unlike the standard LT1054 variant, which supports up to 15V. This limitation is inherent to the LT1054L version's internal process and must be strictly observed in all LT1054LCS8#TRPBF designs.
Can LT1054LCS8#TRPBF generate a regulated –5V output?
Yes, LT1054LCS8#TRPBF can generate a regulated –5V output using an external resistor divider (e.g., R1 = 20kΩ, R2 = 102.6kΩ) connected between VOUT, FB/SHDN, and GND, per Figure 5 in the datasheet. The internal 2.5V reference and error amplifier enable ±1% regulation over line and load variations, provided CIN = 10µF and COUT = 100µF tantalum capacitors are used as specified.
How does the FB/SHDN pin function in LT1054LCS8#TRPBF?
The FB/SHDN pin on LT1054LCS8#TRPBF serves dual roles: as the inverting input for the internal error amplifier during regulation, and as a shutdown control. Pulling this pin below ≈0.45V disables the regulator and stops switching, reducing supply current to <200µA. During normal operation, it accepts feedback from the external resistor divider to maintain output voltage accuracy - a key differentiator of LT1054LCS8#TRPBF versus non-regulating charge pumps.
Is LT1054LCS8#TRPBF pin-compatible with LTC1044CS8#PBF?
Yes, LT1054LCS8#TRPBF is pin-compatible with LTC1044CS8#PBF in the SO-8 package, sharing identical pinout, footprint, and mounting dimensions. However, LT1054LCS8#TRPBF adds regulation capability, a 2.5V VREF pin, shutdown control, and 2.5× higher output current - meaning it can directly replace LTC1044CS8#PBF in existing layouts while enabling new functionality without PCB changes.
What capacitor types are recommended for LT1054LCS8#TRPBF in regulated mode?
For regulated operation, LT1054LCS8#TRPBF requires low-ESR solid tantalum capacitors: CIN = 10µF and COUT = 100µF, as specified in the Regulation section. Aluminum electrolytics may be paralleled with tantalum to reduce cost, but ESR must remain <1Ω for CIN (to avoid 4× effective impedance rise) and <0.5Ω for COUT (to limit ripple step voltage). Ceramic capacitors alone are not recommended due to microphonic effects and DC bias derating.
LT1054LCS8#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):
- 7V
- Voltage - Output (Min/Fixed):
- 2.5V (-Vin, 2Vin)
- Voltage - Output (Max):
- 14V
- Current - Output:
- 120mA
- Frequency - Switching:
- 25kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1054LCS8#TRPBF FAQ
1.How can I place an order for LT1054LCS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054LCS8#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 LT1054LCS8#TRPBF reliable?
The price and inventory of LT1054LCS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054LCS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1054LCS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054LCS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054LCS8#TRPBF?
LT1054LCS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054LCS8#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 LT1054LCS8#TRPBF?
For technical support, including LT1054LCS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054LCS8#TRPBF requirements.
6.How does Aetrix verify that LT1054LCS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1054LCS8#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 LT1054LCS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1054LCS8#TRPBF?
All LT1054LCS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1054LCS8#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 LT1054LCS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1054LCS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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