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Analog Devices Inc. LT1054IS8#PBF
- Part No.:
- LT1054IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1054IS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ/2.5V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,970
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Product details
Overview
LT1054IS8#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 range, features internal 25kHz oscillator, external shutdown via FB/SHDN pin, and supports regulated negative voltage generation in instrumentation power supplies.
For engineers reviewing the LT1054IS8#PBF datasheet, LT1054IS8#PBF pinout, LT1054IS8#PBF application, or LT1054IS8#PBF equivalent, key selection considerations include its regulated inverter capability, 2.5V reference output, shutdown quiescent current <100µA, and compatibility with standard 100µF tantalum charge-transfer capacitors.
Technical Context
The LT1054IS8#PBF implements a four-phase switched-capacitor topology with adaptive bipolar switch drivers optimized for efficiency across 10mA–100mA load range. Its internal error amplifier compares feedback voltage against a trimmed 2.5V reference to regulate output by modulating PNP switch conduction.
Oscillator frequency is nominally 25kHz (15–40kHz over temperature and supply), adjustable via external capacitor on OSC pin or synchronizable to external clock. Shutdown is asserted by pulling FB/SHDN below ≈0.45V, disabling switching and reducing supply current to <100µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100mA max - sufficient for dual-rail op-amp biasing or sensor interface rails |
| Voltage Loss | 1.1V typ at 100mA - determines minimum input headroom for target output magnitude |
| Input Range | 3.5V to 15V - supports wide-input industrial and automotive auxiliary supplies |
| Oscillator Freq | 25kHz nominal - balances switching loss vs. capacitor size; adjustable ±10kHz |
| Reference Voltage | 2.5V ±0.15V - enables precise resistor-divider-based regulation of VOUT |
| Shutdown Current | <100µA - enables low-power sleep modes in battery-backed systems |
| Regulation Accuracy | ±50mV line/load - ensures stable negative rail under varying input and load conditions |
Pinout & Package
LT1054IS8#PBF uses an 8-lead plastic SOIC (S8) package with JEDEC MS-012AC footprint, 1.27mm pitch, and θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB/SHDN | Inverting input of error amp / shutdown control | Pull ≤0.45V to disable regulation and switching; connect to R1/R2 divider for regulation |
| 2 CAP+ | Positive terminal of flying capacitor | Switched between V+ and GND; carries bidirectional 2.2×IOUT peak current |
| 3 GND | Ground reference and substrate tie | All voltages referenced here; VOUT must never go positive relative to this pin |
| 4 CAP− | Negative terminal of flying capacitor | Switched between GND and VOUT; completes charge transfer path |
| 5 VOUT | Regulated negative output / substrate connection | Delivers inverted or doubled output; substrate tie requires careful PCB layout |
| 6 VREF | 2.5V precision reference output | Supplies feedback network; limited to ~60µA to maintain accuracy |
| 7 OSC | Oscillator timing node | Connect external cap to adjust frequency or pull-up + open-collector for sync |
| 8 V+ | Positive input supply | Source for charge transfer; bypass with ≥2µF low-ESR capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Enables stable negative rail without external op-amp or LDO, using only two resistors |
| Adaptive switch driver | Maintains high efficiency across 10–100mA load range by optimizing drive strength |
| External shutdown | Reduces system standby power to <100µA while preserving fast wake-up capability |
| Oscillator synchronization | Allows noise-sensitive systems to align switching edges with master clock, reducing EMI |
| Pin compatibility | Direct replacement for LTC1044/ICL7660 in existing SO-8 layouts, easing upgrade paths |
Applications
| Instrumentation Power Supply | Portable Medical Sensor Bias |
|---|---|
Use Scenario: Generating clean ±5V rails for low-noise op-amps and ADC drivers in handheld test equipment. IC Role / Device Role / Timing Role: Voltage inverter/regulator providing isolated negative rail referenced to system ground. Use Value: Eliminates need for discrete charge-pump IC + LDO combo, reducing BOM count and board area by 30%. | Use Scenario: Powering bridge-based strain gauge amplifiers in battery-operated patient monitors. IC Role / Device Role / Timing Role: Regulated negative supply for instrumentation amplifier bias, synchronized to system clock. Use Value: Achieves <50mV regulation error over 3.5–15V input and 10–100mA load, ensuring measurement stability. |
| Industrial PLC I/O Module | Legacy RS-232 Transceiver Supply |
Use Scenario: Providing isolated –12V rail for analog output drivers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Negative voltage doubler with external shutdown for channel-level power gating. Use Value: Delivers 100mA at –12V with <1.6V loss, enabling direct drive of 4–20mA loop transmitters. | Use Scenario: Generating –12V for MAX232-class RS-232 level shifters in embedded gateways. IC Role / Device Role / Timing Role: Unregulated voltage inverter operating at fixed 25kHz to minimize external component count. Use Value: Supports full RS-232 voltage swing (±12V) using only two 100µF tantalum caps and no inductors. |
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 100mA output; no VREF pin; 10kHz oscillator | Suitable only for unregulated inverter/doubler use; cannot implement feedback regulation | Select when regulation is unnecessary and lower EMI at 10kHz is preferred |
| MAX680CPA+ | CMOS process; 100mA output; no regulation; 100kHz oscillator; higher quiescent current (1.5mA) | Higher switching frequency allows smaller capacitors but increases EMI sensitivity | Select when board space is constrained and 100kHz ripple filtering is feasible |
Compared with LTC1044CS8#PBF and MAX680CPA+, the LT1054IS8#PBF uniquely integrates regulation, a 2.5V reference, and shutdown-enabling single-chip negative rail generation with <50mV line/load regulation, whereas alternatives require external components to achieve comparable performance.
Availability
LT1054IS8#PBF is available at Aetrix Electronics and suitable for instrumentation power supplies, portable medical sensors, industrial I/O modules, and legacy RS-232 transceiver designs requiring stable component supply across extended temperature ranges.
Supply support for LT1054IS8#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, communications, automotive, and healthcare markets.
The LT1054 product line was designed specifically for high-efficiency, low-noise switched-capacitor DC/DC conversion in space-constrained analog systems where inductors are prohibited.
FAQ
What is the maximum output current capability of the LT1054IS8#PBF?
The LT1054IS8#PBF delivers up to 100mA of continuous output current in inverter configuration with 3.5V–15V input. At 100mA, typical voltage loss is 1.1V; derating is required above 100mA due to thermal limits in the SO-8 package. The LT1054L variant supports 125mA but only up to 7V input.
How does the LT1054IS8#PBF achieve regulated output voltage?
The LT1054IS8#PBF 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 to set the desired output voltage. The device adjusts internal switch duty cycle to maintain feedback voltage at 2.5V, enabling precise negative rail regulation without external op-amps.
Can the LT1054IS8#PBF be synchronized to an external clock?
Yes, the LT1054IS8#PBF supports external synchronization via the OSC pin (Pin 7). A 20kΩ pull-up to VREF and an open-collector driver (e.g., NPN transistor or logic gate) applied to Pin 7 allows synchronization to an external system clock, reducing beat frequencies and EMI in noise-sensitive applications.
What is the purpose of the VOUT pin being tied to the substrate in the LT1054IS8#PBF?
In the LT1054IS8#PBF, the VOUT pin (Pin 5) is internally connected to the silicon substrate. This requires that VOUT never be pulled positive relative to GND (Pin 3), or the substrate diode will forward-bias and prevent startup. When driving loads referenced to a positive supply (e.g., op-amp V– pins), an external transistor must isolate VOUT during startup.
What capacitor types and values are recommended for LT1054IS8#PBF operation?
For reliable LT1054IS8#PBF operation, use solid tantalum capacitors: CIN = 10µF (min), COUT = 100µF (min), both rated ≥10V. Low-ESR is critical-CIN ESR contributes 4× to output loss. For cost-sensitive designs, parallel a small tantalum (e.g., 10µF) with a larger aluminum electrolytic (e.g., 100µF) to balance ESR and price.
LT1054IS8#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:
- -40°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1054IS8#PBF FAQ
1.How can I place an order for LT1054IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054IS8#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 LT1054IS8#PBF reliable?
The price and inventory of LT1054IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1054IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054IS8#PBF?
LT1054IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054IS8#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 LT1054IS8#PBF?
For technical support, including LT1054IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054IS8#PBF requirements.
6.How does Aetrix verify that LT1054IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1054IS8#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 LT1054IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1054IS8#PBF?
All LT1054IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1054IS8#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 LT1054IS8#PBF part is unused and in its original packaging.
Return procedure for LT1054IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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