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Analog Devices Inc. LT1054MJ8
- Part No.:
- LT1054MJ8
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
LT1054MJ8.pdf
- Description:
- IC REG CHG PUMP ADJ/2.5V 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,451
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Product details
Overview
LT1054MJ8 from Analog Devices is a monolithic bipolar switched-capacitor voltage converter and regulator in an 8-lead ceramic DIP package, rated for –55°C to 125°C operation. It delivers up to 100mA output current with typical voltage loss of 1.1V at 100mA, operates from 3.5V to 15V input, features internal 25kHz oscillator, and supports external regulation via feedback pin. It is used in precision analog power rails requiring stable negative or doubled voltages in military/aerospace systems.
For engineers reviewing the LT1054MJ8 datasheet, LT1054MJ8 pinout, LT1054MJ8 application, or LT1054MJ8 equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, and real-world application constraints - all specific to the LT1054MJ8 ceramic DIP variant with extended temperature range.
Technical Context
The LT1054MJ8 implements a charge-pump topology with adaptive switch driver circuitry that maintains low voltage loss (1.1V @ 100mA) across its full 3.5V–15V input range. Its internal reference (2.5V ±0.15V) and error amplifier enable regulated output configurations using external resistor dividers, with line regulation ≤25mV and load regulation ≤50mV.
It integrates a nominally 25kHz oscillator with external synchronization capability via Pin 7 (OSC), supports shutdown by grounding Pin 1 (FB/SHDN) to reduce supply current to <100µA, and allows paralleling for higher output current. The J8 package's ceramic construction ensures reliability under thermal shock and extended temperature cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100mA maximum - sufficient for powering op-amp dual-rail supplies or sensor signal chains without external pass devices. |
| Voltage Loss | 1.1V typical at 100mA - defines minimum input-to-output differential required for regulation; impacts efficiency in low-VIN applications. |
| Input Voltage Range | 3.5V to 15V - supports wide-input industrial and legacy 5V/12V systems; absolute max 16V (unregulated mode). |
| Oscillator Frequency | 25kHz nominal - balances switching loss vs. capacitor size; adjustable externally via OSC pin for EMI control or synchronization. |
| Reference Voltage | 2.5V ±0.15V - enables precise output regulation; temperature-compensated to minimize drift in feedback networks. |
| Shutdown Current | <100µA - enables ultra-low-power standby in battery-backed instrumentation or intermittent-duty systems. |
| Junction Temp Range | –55°C to 125°C - qualified for military, avionics, and downhole electronics where plastic packages fail. |
Pinout & Package
LT1054MJ8 uses an 8-lead ceramic DIP (J8) package with 0.3-inch width, hermetically sealed for high-reliability environments. Thermal resistance θJA = 130°C/W; maximum junction temperature = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: FB/SHDN | Feedback input / Shutdown control | Pulling below ≈0.45V disables switching and reference; also serves as inverting input for regulation loop with external R-divider. |
| Pin 2: CAP+ | Positive side of input capacitor | Switched between V+ and GND; carries bidirectional charge-transfer current ≈2.2×IOUT. |
| Pin 3: GND | Circuit ground reference | Substrate tie point; VOUT (Pin 5) must never be pulled positive relative to this pin to avoid substrate diode conduction. |
| Pin 4: CAP– | Negative side of input capacitor | Switched between GND and VOUT; completes charge-transfer path during pump cycle. |
| Pin 5: VOUT | Output voltage terminal | Also tied to substrate; requires external transistor isolation when driving loads referenced to positive supply (e.g., op-amps). |
| Pin 6: VREF | 2.5V reference output | Stable reference for feedback network; limited to ≈60µA load to maintain accuracy and TC performance. |
| Pin 7: OSC | Oscillator timing node | Allows frequency adjustment (±capacitor) or external synchronization; internal Ct ≈150pF, ±7µA charge/discharge. |
| Pin 8: V+ | Input supply connection | Supplies energy to CIN during charging phase; peak current ≈2.2×IOUT, requiring ≥2µF low-ESR bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Regulated switched-capacitor conversion | Enables stable negative or doubled outputs without inductors; eliminates magnetic EMI and layout sensitivity of inductive DC/DCs. |
| Adaptive switch driver | Maintains low voltage loss (1.1V @ 100mA) across full input range and load variation - critical for battery-powered analog circuits. |
| External shutdown with <100µA quiescent current | Supports microcontroller-controlled power gating in portable test equipment or remote sensors with strict sleep-current budgets. |
| Pin compatibility with LTC1044/ICL7660 | Enables drop-in replacement in legacy designs while delivering higher output current and integrated regulation - no PCB rework needed. |
| Ceramic DIP (J8) packaging | Provides hermetic sealing, superior thermal stability, and extended –55°C to 125°C operation - essential for aerospace and defense deployments. |
Applications
| Instrumentation Power Supply | Avionics Bipolar Rail Generator |
|---|---|
|
Use Scenario: Generating ±12V rails from a single 5V or 12V aircraft bus to power precision ADC drivers and strain gauge amplifiers. IC Role / Device Role / Timing Role: Voltage inverter/regulator providing isolated negative rail with tight line/load regulation (≤25mV/≤50mV) and low noise. Use Value: Eliminates need for bulky transformers or inductive converters; ceramic J8 package withstands vibration and thermal cycling in flight control systems. |
Use Scenario: Creating regulated –5V supply for legacy analog cockpit displays powered from 28V DC aircraft bus. IC Role / Device Role / Timing Role: Negative voltage doubler with external feedback enabling precise –5.00V output despite wide input variation (22–32V). Use Value: Meets MIL-STD-704A voltage tolerance specs; J8 package ensures operation at –55°C cold-soak and 125°C engine-bay ambient. |
| Downhole Sensor Signal Conditioning | Military Data Acquisition Module |
|
Use Scenario: Powering low-noise instrumentation amplifiers in oil/gas well logging tools exposed to >125°C downhole temperatures. IC Role / Device Role / Timing Role: Regulated negative voltage source for op-amp biasing, leveraging LT1054MJ8's guaranteed 125°C junction rating. Use Value: Ceramic DIP avoids plastic package degradation; shutdown mode reduces power during telemetry bursts to extend battery life. |
Use Scenario: Providing isolated –15V rail for analog front-end of ruggedized field-deployable spectrum analyzers. IC Role / Device Role / Timing Role: High-reliability voltage inverter with external OSC synchronization to suppress switching noise near sensitive RF receivers. Use Value: Pin-compatible upgrade from obsolete ICL7660; 100mA output supports multiple op-amp stages without derating. |
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 |
|---|---|---|---|
| LTC1044CN8#PBF | No internal regulation; fixed 100mA output; no VREF pin; 12kHz oscillator; wider temp range (0°C to 70°C only) | Unregulated inversion only; cannot implement feedback-based output stabilization or shutdown control | Select when cost-sensitive, non-regulated inversion suffices and extended temperature is not required. |
| ICL7660CBAZ | Lower output current (20mA); no regulation; no shutdown; 10kHz oscillator; SO-8 only; commercial temp only (0°C to 70°C) | Basic unregulated inversion only; unsuitable for >20mA loads or harsh environments | Select only for low-current, non-critical consumer-grade applications with no thermal or reliability demands. |
Compared with LTC1044CN8#PBF and ICL7660CBAZ, the LT1054MJ8 uniquely combines regulation, shutdown, 100mA output, and –55°C to 125°C operation in a hermetic ceramic package - making it the sole option for regulated, high-reliability charge-pump power in aerospace and defense systems.
Availability
LT1054MJ8 is available at Aetrix Electronics and suitable for military avionics, downhole instrumentation, and ruggedized data acquisition systems requiring stable component supply with long-term obsolescence mitigation.
Supply support for LT1054MJ8 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, and aerospace markets since 1965.
The LT1054 product line was designed specifically for high-reliability, inductorless DC/DC conversion in analog signal chains - emphasizing regulation accuracy, thermal robustness, and compatibility with legacy charge-pump footprints.
FAQ
Is LT1054MJ8 still in active production?
No - LT1054MJ8 is marked as OBSOLETE PART in official Analog Devices documentation. However, Aetrix Electronics maintains traceable, tested inventory of genuine LT1054MJ8 units for legacy system repair and long-lifecycle programs requiring ceramic DIP reliability. Full parametric validation per Rev. I datasheet is performed on each lot.
What is the maximum output current of LT1054MJ8 at 125°C junction temperature?
The LT1054MJ8 is rated for 100mA output current across its full –55°C to 125°C operating junction temperature range. This is confirmed in the Electrical Characteristics table (p.3) and Typical Performance Curves (TPC01), which show voltage loss remains ≤1.6V at 100mA even at TJ = 125°C.
Can LT1054MJ8 be used as a positive voltage doubler?
Yes - the LT1054MJ8 supports positive voltage doubling per Typical Application TA05 (p.10). Input is applied to Pin 4 (CAP–), output is taken from Pin 2 (CAP+), with Pin 5 (VOUT) grounded. Output approximates 2×VIN minus voltage loss and diode drops when external diodes are used.
Does LT1054MJ8 require external capacitors, and what values are recommended?
Yes - LT1054MJ8 requires external flying (CIN) and output (COUT) capacitors. For 100mA operation, 100µF tantalum capacitors are recommended for both, with CIN placed close to Pins 2/4 and COUT to Pin 5. Low-ESR construction is mandatory to limit voltage loss; ESR >1Ω on CIN degrades output impedance by ~4Ω.
How does the shutdown function work on LT1054MJ8?
Grounding Pin 1 (FB/SHDN) below ≈0.45V disables the internal oscillator and reference, reducing supply current to <100µA. During shutdown, internal switches discharge both CIN and COUT through the load. To restart, release Pin 1 or apply a >0.7V pulse >100µs - as detailed in Figure 5 (p.8) of the datasheet.
LT1054MJ8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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):
- 14V
- Current - Output:
- 100mA
- Frequency - Switching:
- 25kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
LT1054MJ8 FAQ
1.How can I place an order for LT1054MJ8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054MJ8 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 LT1054MJ8 reliable?
The price and inventory of LT1054MJ8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054MJ8 is usually 5 days.
3.What payment methods are accepted for LT1054MJ8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054MJ8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054MJ8?
LT1054MJ8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054MJ8 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 LT1054MJ8?
For technical support, including LT1054MJ8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054MJ8 requirements.
6.How does Aetrix verify that LT1054MJ8 is sourced from the original manufacturer or authorized distributors?
All LT1054MJ8 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 LT1054MJ8 meets industry standards.
7.What is the process for return or replacement of LT1054MJ8?
All LT1054MJ8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1054MJ8, 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 LT1054MJ8 part is unused and in its original packaging.
Return procedure for LT1054MJ8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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