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Analog Devices Inc. LT1054IS8#TRPBF
- Part No.:
- LT1054IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1054IS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ/2.5V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:5,407
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Product details
Overview
LT1054IS8#TRPBF 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 clean ±12V from 5V or 12V sources.
For engineers reviewing the LT1054IS8#TRPBF datasheet, LT1054IS8#TRPBF pinout, LT1054IS8#TRPBF application, or LT1054IS8#TRPBF equivalent, key selection criteria include guaranteed 100mA output capability at –40°C to +100°C, regulation accuracy (±0.3V over line/load), shutdown quiescent current <200µA, and compatibility with standard 100µF tantalum charge-transfer capacitors.
Technical Context
The LT1054IS8#TRPBF implements a four-phase switched-capacitor topology with adaptive bipolar switch drivers optimized for low conduction loss across 10mA–100mA load range. Its error amplifier compares feedback voltage against a trimmed 2.5V reference (±0.15V initial tolerance) to regulate output by modulating PNP switch duty cycle.
Internal oscillator operates at nominal 25kHz (15–40kHz range), adjustable via external capacitor on OSC pin or synchronizable to external clock. Shutdown is asserted when FB/SHDN pin voltage drops below ≈0.45V, disabling regulator and switching while discharging CIN/COUT through load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100mA maximum - sufficient to power dual op-amp rails or small analog signal chains without external boost. |
| Voltage Loss | 1.1V typical at 100mA - enables ≥13.9V negative output from 15V input in inverter mode. |
| Input Range | 3.5V to 15V - supports wide-input industrial and automotive auxiliary rails. |
| Oscillator Freq | 25kHz nominal - balances switching loss vs. capacitor size; adjustable ±10kHz via OSC pin. |
| Reference Voltage | 2.5V ±0.15V - stable internal reference enabling precise regulation with external R-divider. |
| Shutdown Current | <200µA - reduces system standby power in battery-backed instrumentation. |
| Operating Temp | –40°C to +100°C - qualified for extended industrial temperature operation. |
Pinout & Package
LT1054IS8#TRPBF uses an 8-lead plastic SOIC (S8) package with standard SO-8 footprint (5.0mm × 6.2mm, 1.27mm pitch). Thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/SHDN (1) | Inverting input / shutdown control | Pull ≤0.45V to disable regulator and stop switching; also sets regulated output voltage via R-divider. |
| CAP+ (2) | Positive side of input capacitor | Switched between V+ and GND to charge CIN; carries peak current ≈2.2×IOUT. |
| GND (3) | Ground reference | Substrate tie point; all voltages referenced here; VOUT must not exceed GND potential during startup. |
| CAP– (4) | Negative side of input capacitor | Switched between GND and VOUT to transfer charge; unidirectional current flow per bipolar switch design. |
| VOUT (5) | Negative output terminal | Delivers regulated or unregulated inverted voltage; tied to substrate-requires isolation from positive-referenced loads. |
| VREF (6) | 2.5V reference output | Provides stable reference for feedback network; max 60µA load recommended for regulation accuracy. |
| OSC (7) | Oscillator timing node | Connect external cap to adjust frequency or pull-up + open-collector gate to synchronize to system clock. |
| V+ (8) | Positive supply input | Supplies energy to CIN; bypass with ≥2µF low-ESR capacitor to handle pulsed 2.2×IOUT demand. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Enables stable negative output (e.g., –5.0V ±0.2V) without external LDO, using only two resistors and one capacitor. |
| Adaptive switch drive | Optimizes efficiency across 10–100mA load range, maintaining <1.6V voltage loss even at full rated current. |
| External synchronization | OSC pin accepts external clock signal, allowing noise-sensitive systems to avoid beat frequencies with ADC or RF sections. |
| Shutdown with auto-discharge | FB/SHDN assertion disables switching and actively discharges CIN/COUT through load, preventing residual output voltage. |
| Pin compatibility | Direct replacement for LTC1044/ICL7660 in existing SO-8 layouts-no PCB revision required for upgrade path. |
Applications
| Op-Amp Dual-Rail Supply | Portable Instrumentation Bias |
|---|---|
Use Scenario: Generating ±12V from single 12V battery in handheld test equipment. IC Role / Device Role / Timing Role: Voltage inverter/regulator providing isolated negative rail for precision op-amps and ADC drivers. Use Value: Eliminates need for discrete charge-pump IC + LDO cascade; achieves –12.0V ±0.25V at 50mA with <10mV ripple using 100µF tantalum caps. | Use Scenario: Powering low-noise front-end amplifiers in portable gas sensors operating from 3.7V Li-ion. IC Role / Device Role / Timing Role: Negative voltage doubler generating –7.4V bias for sensor bridge excitation and transimpedance amplifier. Use Value: Delivers –7.4V at 25mA with 1.35V voltage loss, enabling >10-hour runtime by avoiding inefficient inductor-based DC/DC. |
| Industrial PLC I/O Module | Medical Sensor Signal Chain |
Use Scenario: Providing isolated –5V rail for analog input conditioning in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Regulated voltage inverter referenced to system ground, supporting 4–20mA loop receivers and isolation amplifiers. Use Value: Maintains –5.0V ±0.15V over –40°C to +75°C ambient and 10–100mA load step, meeting IEC 61000-4-2 immunity requirements. | Use Scenario: Biasing photodiode TIA and ADC reference in portable ECG monitor with 5V USB input. IC Role / Device Role / Timing Role: Low-noise negative supply generator synchronized to ADC sampling clock to suppress switching artifacts. Use Value: OSC pin synchronization reduces 25kHz switching noise in ECG bandwidth (<150Hz) by 22dB, improving SNR by 3.5 bits. |
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 25kHz oscillator; 50mA max output; no shutdown pin. | Suitable only for unregulated inverter/doubler use; cannot replace LT1054IS8#TRPBF in regulated designs. | Select only if regulation and shutdown are unnecessary and output current ≤50mA. |
| MAX680CPA+ | CMOS process; 100mA output; no regulation; 100kHz oscillator; requires external timing cap. | Higher-frequency operation allows smaller capacitors but increases EMI sensitivity; no feedback capability. | Prefer when board space is critical and regulation is handled externally; verify layout for 100kHz noise coupling. |
Compared with LTC1044CS8#PBF and MAX680CPA+, the LT1054IS8#TRPBF uniquely integrates regulation, shutdown, and adaptive drive in a drop-in SO-8 package-enabling single-chip negative rail generation where precision, low standby power, and thermal robustness are required.
Availability
LT1054IS8#TRPBF is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical sensors, test-and-measurement equipment, and analog signal chain power supplies requiring stable component supply across extended temperature ranges.
Supply support for LT1054IS8#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.
The LT1054 product line was designed specifically for high-current, low-loss switched-capacitor DC/DC conversion in space-constrained analog systems where inductors are undesirable-targeting precision instrumentation, sensor interfaces, and dual-rail op-amp supplies.
FAQ
What is the maximum output current specification for LT1054IS8#TRPBF?
The LT1054IS8#TRPBF is rated for 100mA maximum continuous output current under specified conditions: input voltage 3.5V–15V, ambient temperature –40°C to +100°C, and 100µF tantalum input/output capacitors. This value is guaranteed across the full operating temperature range and reflects worst-case voltage loss (≤1.6V) at full load.
Can LT1054IS8#TRPBF generate a regulated positive voltage?
No-LT1054IS8#TRPBF is configured exclusively for negative output generation (voltage inverter or negative doubler). Its internal architecture ties VOUT to substrate and references regulation to ground, making positive-regulated outputs incompatible. For positive doubling, external diodes and capacitors are required per Figure TAO5, but regulation applies only to the negative rail.
How does the FB/SHDN pin function in regulation versus shutdown modes?
In regulation mode, the FB/SHDN pin serves as the inverting input of the internal error amplifier-connected to the bottom of an external resistor divider to set output voltage. In shutdown mode, pulling this pin below ≈0.45V disables the reference, stops switching, and actively discharges CIN/COUT through the load. Both functions share the same pin but operate in mutually exclusive states.
What capacitor types and values are recommended for LT1054IS8#TRPBF in regulated mode?
For regulated operation, Analog Devices specifies 10µF tantalum for CIN and 100µF tantalum for COUT, with C1 = 0.002µF ceramic for load regulation. Solid tantalum is mandatory due to low ESR requirements-aluminum electrolytics may be paralleled with tantalum for cost reduction, but ESR >1Ω on CIN degrades voltage loss by up to 4Ω equivalent series resistance.
Is LT1054IS8#TRPBF pin-compatible with the older LTC1044?
Yes-LT1054IS8#TRPBF is explicitly documented as pin-compatible with LTC1044/ICL7660 in SO-8 packages. Pin assignments, footprint, and basic inverter/doubler connections match exactly. However, LT1054IS8#TRPBF adds regulation and shutdown functionality not present in LTC1044, so legacy designs gain enhanced features without layout change.
LT1054IS8#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:
- -40°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1054IS8#TRPBF FAQ
1.How can I place an order for LT1054IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054IS8#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 LT1054IS8#TRPBF reliable?
The price and inventory of LT1054IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1054IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054IS8#TRPBF?
LT1054IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054IS8#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 LT1054IS8#TRPBF?
For technical support, including LT1054IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054IS8#TRPBF requirements.
6.How does Aetrix verify that LT1054IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1054IS8#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 LT1054IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1054IS8#TRPBF?
All LT1054IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1054IS8#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 LT1054IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1054IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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