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Texas Instruments LT1054CPE4
- Part No.:
- LT1054CPE4
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1054CPE4.pdf
- Description:
- IC REG CHG PUMP ADJ/-1.25V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,471
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Product details
Overview
LT1054CPE4 from Texas Instruments is a bipolar switched-capacitor voltage converter with integrated regulation, configured as a negative voltage inverter/regulator. It delivers 100 mA output current with 1.1 V typical voltage loss at full load, operates from 3.5 V to 15 V input, and features an internal 2.5 V reference and shutdown control via FB/SD pin - used in RS-232 interface power supplies and data acquisition systems.
For engineers reviewing the LT1054CPE4 datasheet, LT1054CPE4 pinout, LT1054CPE4 application, or LT1054CPE4 equivalent, key selection criteria include regulated negative output capability, external oscillator synchronization support, shutdown quiescent current of 100 µA, adaptive-switch drive for efficiency optimization, and compatibility with tantalum capacitor networks for low-ESR operation.
Technical Context
The LT1054CPE4 implements a charge-pump topology with internal PNP switch control driven by an error amplifier comparing FB/SD voltage against a 2.5 V reference. Its adaptive-switch drive dynamically adjusts conduction timing to maintain regulation across 10 mA–100 mA loads while minimizing voltage loss.
Oscillator frequency is nominally 25 kHz and adjustable via OSC pin (Pin 7), enabling external synchronization or fine-tuning to minimize switching losses. Shutdown is asserted by pulling FB/SD below ≈0.45 V, disabling switching and reducing supply current to 100 µA while discharging CIN and COUT through the load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100 mA maximum regulated output - supports moderate-power analog front-ends and interface rails. |
| Voltage Loss | 1.1 V typical at 100 mA - defines minimum input-to-output differential required for regulation. |
| Input Range | 3.5 V to 15 V - enables direct use from 5 V or 12 V system rails without pre-regulation. |
| Oscillator Freq | 15–35 kHz - adjustable range allows optimization for EMI, efficiency, or capacitor size trade-offs. |
| Reference Voltage | 2.5 V ±0.25 V - stable internal reference enables precise resistor-divider-based output programming. |
| Shutdown Iq | 100 µA - enables low-power sleep modes in battery-backed or intermittent-use systems. |
| Regulated Output | −4.7 V to −5.2 V (at −5 V setpoint) - tight 50 mV output regulation over temperature and load. |
Pinout & Package
LT1054CPE4 is packaged in an 8-pin PDIP (Plastic Dual In-line Package) with body dimensions 9.50 mm × 6.35 mm, rated for 0°C to 70°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/SD (Pin 1) | Error amp in / shutdown control | Pull below 0.45 V to disable switching and reduce Iq to 100 µA; connect to resistor divider for regulation. |
| CAP+ (Pin 2) | Positive charge pump node | Connects to positive terminal of flying capacitor (CIN); carries ~2× output current. |
| GND (Pin 3) | Power ground reference | Common return for VCC, CAP−, and load; must be low-impedance for ripple control. |
| CAP− (Pin 4) | Negative charge pump node | Connects to negative terminal of flying capacitor (CIN); critical for charge transfer path integrity. |
| VOUT (Pin 5) | Regulated negative output | Delivers inverted, regulated voltage referenced to GND; requires low-ESR COUT (e.g., 100 µF tantalum). |
| VREF (Pin 6) | 2.5 V reference output | Provides precision reference for feedback network; max load 60 µA to maintain accuracy. |
| OSC (Pin 7) | Oscillator control | Adjusts or synchronizes internal 25 kHz clock; external cap or open-collector driver supported. |
| VCC (Pin 8) | Positive supply input | Accepts 3.5–15 V; powers internal circuitry and charge pump switches. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Eliminates need for external error amplifier; enables stable −5 V (or other) output using only two resistors. |
| Adaptive-switch drive | Maintains high efficiency across 10–100 mA load range by optimizing switch timing per current demand. |
| External oscillator sync | Allows alignment with system clock to suppress beat frequencies and simplify EMI filtering. |
| Parallel operation support | Enables current sharing across multiple LT1054CPE4 units to scale output beyond 100 mA. |
| Pin-to-pin compatibility | Direct replacement for LTC1044 and ICL7660 in existing designs, preserving layout and BOM. |
Applications
| RS-232 Interface Power | Data Acquisition Supply |
|---|---|
Use Scenario: Generating isolated −5 V rail for RS-232 transceivers in industrial PLCs and embedded serial gateways. IC Role / Device Role / Timing Role: Negative voltage inverter/regulator providing clean, load-stable bias for MAX232-level drivers. Use Value: Eliminates need for isolated DC/DC converters; achieves <50 mV load regulation with 100 µF tantalum COUT. | Use Scenario: Powering dual-rail op-amps and ADC reference buffers in portable data loggers. IC Role / Device Role / Timing Role: Regulated negative supply generator ensuring signal integrity in precision analog signal chains. Use Value: 2.5 V reference and FB/SD feedback enable accurate −5 V output with <0.5% drift over 0°C–70°C. |
| Voltage Inverter for Sensors | Negative Voltage Doubler |
Use Scenario: Providing −12 V bias for piezoelectric sensor conditioning circuits in structural health monitoring systems. IC Role / Device Role / Timing Role: High-efficiency charge-pump inverter delivering stable negative rail from single 12 V supply. Use Value: Adaptive-switch drive maintains <1.6 V voltage loss even at full 100 mA, maximizing usable headroom. | Use Scenario: Generating −10 V from +5 V for op-amp offset nulling in test equipment front-ends. IC Role / Device Role / Timing Role: Configured as negative doubler to double input magnitude while retaining regulation capability. Use Value: External resistor divider on FB/SD enables precise −10 V setpoint with 25 mV line regulation. |
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 regulator; unregulated output only; 20 mA max output; no VREF pin. | Suitable only for non-critical inversion where load regulation <±5% is acceptable. | Select when cost sensitivity outweighs regulation need and output current ≤20 mA. |
| ICL7660CPA | No regulation, no shutdown, no VREF; 20 mA output; fixed 10 kHz oscillator; higher voltage loss (2.5 V @ 20 mA). | Used in legacy low-current inverters where simplicity and footprint are primary concerns. | Choose only for drop-in replacement in obsolete ICL7660 designs with minimal load variation. |
Compared with LTC1044CN8#PBF and ICL7660CPA, the LT1054CPE4 provides 5× higher output current, integrated regulation, 100 µA shutdown, and a precision 2.5 V reference - making it the sole option among the three capable of stable −5 V generation under dynamic load in modern industrial interfaces.
Availability
LT1054CPE4 is available at Aetrix Electronics and suitable for RS-232 interface power, data acquisition supply, and sensor biasing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1054CPE4 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital logic for industrial, automotive, and communications markets.
The LT1054 product line was developed to deliver regulated switched-capacitor voltage conversion for space-constrained analog systems needing clean, efficient negative rails - targeting instrumentation, interface, and sensor signal conditioning applications.
FAQ
What is the maximum output current of the LT1054CPE4?
The LT1054CPE4 delivers up to 100 mA of regulated output current at a typical voltage loss of 1.1 V. This rating applies across its full operating input range (3.5 V to 15 V) and temperature range (0°C to 70°C). Exceeding 100 mA may cause thermal shutdown or regulation failure, especially in the PDIP package due to its 85°C/W junction-to-ambient thermal resistance.
How does the LT1054CPE4 achieve output regulation?
The LT1054CPE4 achieves regulation using an internal 2.5 V reference and error amplifier that compares the FB/SD pin voltage against the reference. An external resistor divider from VOUT to GND sets the desired output voltage; the error amplifier then controls the PNP switch duty cycle to maintain regulation. This architecture enables stable −5 V output with ≤50 mV load regulation across 10–100 mA.
Can the LT1054CPE4 be synchronized to an external clock?
Yes, the LT1054CPE4 supports external oscillator synchronization via the OSC pin (Pin 7). An open-collector gate or NPN transistor can drive this pin at the desired system clock frequency, allowing EMI reduction and timing coordination. A 20 kΩ pull-up to VREF is recommended. Synchronization preserves regulation functionality and does not require modification to the FB/SD feedback network.
What capacitors are required for stable operation of the LT1054CPE4?
The LT1054CPE4 requires three external capacitors: a 10 µF low-ESR tantalum flying capacitor (CIN) between CAP+ and CAP−, a 100 µF low-ESR tantalum output capacitor (COUT) from VOUT to GND, and a 0.002 µF ceramic capacitor (C1) from FB/SD to GND for loop stability. Using aluminum electrolytics alone degrades regulation; paralleling them with tantalum improves ESR performance.
Is the LT1054CPE4 pin-compatible with older charge-pump ICs?
Yes, the LT1054CPE4 is explicitly pin-to-pin compatible with the LTC1044 and ICL7660 families in the 8-pin PDIP package. Pin assignments for VCC, GND, CAP+, CAP−, VOUT, and OSC match exactly. However, LT1054CPE4 adds functional enhancements - including FB/SD shutdown/regulation and VREF - which remain unused in legacy footprints but enable immediate performance upgrades when wiring is modified.
LT1054CPE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- 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):
- -1.25V
- Voltage - Output (Max):
- -15V
- Current - Output:
- 100mA
- Frequency - Switching:
- 25kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1054CPE4 FAQ
1.How can I place an order for LT1054CPE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054CPE4 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 LT1054CPE4 reliable?
The price and inventory of LT1054CPE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054CPE4 is usually 5 days.
3.What payment methods are accepted for LT1054CPE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054CPE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054CPE4?
LT1054CPE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054CPE4 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 LT1054CPE4?
For technical support, including LT1054CPE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054CPE4 requirements.
6.How does Aetrix verify that LT1054CPE4 is sourced from the original manufacturer or authorized distributors?
All LT1054CPE4 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 LT1054CPE4 meets industry standards.
7.What is the process for return or replacement of LT1054CPE4?
All LT1054CPE4 units undergo pre-shipment inspection (PSI). If there is an issue with LT1054CPE4, 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 LT1054CPE4 part is unused and in its original packaging.
Return procedure for LT1054CPE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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