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Texas Instruments LT1054CP
- Part No.:
- LT1054CP
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1054CP.pdf
- Description:
- IC REG CHARG PUMP ADJ/3.5V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:414
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Product details
Overview
LT1054CP from Texas Instruments is a bipolar switched-capacitor voltage converter with integrated regulation, designed as a negative voltage generator or charge pump. It delivers up to 100 mA output current with typical voltage loss of 1.1 V at 100 mA, operates from 3.5 V to 15 V input, features an internal 2.5 V reference and error amplifier for feedback-based regulation, and supports external shutdown via the FB/SD pin - commonly used in RS-232 interface power supplies.
For engineers reviewing the LT1054CP datasheet, LT1054CP pinout, LT1054CP application, or LT1054CP equivalent, key selection considerations include regulated negative output capability, oscillator synchronization support, shutdown quiescent current (100 µA), output voltage loss vs. load, and compatibility with tantalum capacitor networks for industrial communications and data acquisition systems.
Technical Context
The LT1054CP implements a four-phase switched-capacitor topology with adaptive switch drive to minimize conduction and switching losses across 10–100 mA loads. Its internal oscillator runs nominally at 25 kHz and can be synchronized externally via the OSC pin or adjusted using external capacitors.
Regulation is achieved through an internal error amplifier comparing FB/SD voltage against a trimmed 2.5 V reference; output voltage is set by an external resistive divider. Shutdown is asserted by pulling FB/SD below ≈0.45 V, disabling switching and reducing supply current to 100 µA while discharging external capacitors through the load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100 mA maximum regulated output - sufficient for powering RS-232 transceivers or analog front-end bias rails. |
| Voltage Loss | 1.1 V typical at 100 mA - defines minimum input headroom required for target negative output (e.g., −5 V needs ≥6.1 V VCC). |
| Input Range | 3.5 V to 15 V - supports wide-input industrial and legacy logic-supply environments. |
| Oscillator Freq | 15–35 kHz - adjustable via OSC pin; optimized for minimal voltage loss in standard configurations. |
| Reference Voltage | 2.5 V ±0.25 V - stable internal reference enabling precise feedback-based regulation of VOUT. |
| Shutdown Current | 100 µA typical - enables low-power standby in battery-backed or intermittent-operation systems. |
| Operating Temp | 0°C to 70°C - commercial-grade temperature range suitable for non-automotive embedded applications. |
Pinout & Package
LT1054CP is packaged in an 8-pin PDIP (9.50 mm × 6.35 mm) with gull-wing leads and standard through-hole mounting. Pin 1 is FB/SD (feedback/shutdown), Pin 2 is CAP+ (positive side of input capacitor), Pin 3 is GND, Pin 4 is CAP− (negative side of input capacitor), Pin 5 is VOUT (regulated negative output), Pin 6 is VREF (2.5 V reference output), Pin 7 is OSC (oscillator control), and Pin 8 is VCC (positive supply input). Pins 1, 2, 7, and 8 are active; no internal connections on unused pins in this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/SD (Pin 1) | Error amp in / shutdown control | Pulling below 0.45 V disables switching and reduces ICC to 100 µA; used with R1/R2 divider to regulate VOUT. |
| CAP+ (Pin 2) | Positive terminal of CIN | Connects to positive plate of flying capacitor; carries bidirectional 2×IOUT ripple current. |
| GND (Pin 3) | Ground reference | Common return for VOUT, VREF, and internal circuitry; must be low-impedance for regulation stability. |
| CAP− (Pin 4) | Negative terminal of CIN | Connects to negative plate of flying capacitor; critical path for charge transfer during inversion cycle. |
| VOUT (Pin 5) | Regulated negative output | Delivers inverted, regulated voltage (e.g., −5 V); ESR of COUT directly impacts load regulation and ripple. |
| VREF (Pin 6) | 2.5 V reference output | Provides stable reference for feedback network; max load 60 µA to maintain accuracy. |
| OSC (Pin 7) | Oscillator timing control | Allows frequency adjustment or external clock synchronization; internal Ct ≈150 pF, ±7 µA charge/discharge. |
| VCC (Pin 8) | Positive supply input | Accepts 3.5–15 V; powers internal logic, drivers, and reference - not connected to output stage directly. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Enables precise negative output (e.g., −5.0 V ±50 mV) without external op-amps - simplifies BOM and layout for data acquisition supplies. |
| Adaptive switch drive | Optimizes efficiency across 10–100 mA load range - maintains low voltage loss even at light loads where fixed-drive converters degrade. |
| External oscillator sync | Permits noise-sensitive systems to lock LT1054CP switching to master clock - avoids beat frequencies in mixed-signal PCBs. |
| Parallel operation support | Multiple LT1054CP units can share load via common CAP+/CAP− nodes - scales output current beyond 100 mA without redesigning feedback. |
| Pin-to-pin compatibility | Direct replacement for LTC1044 and ICL7660 in PDIP-8 footprint - allows drop-in upgrade to higher-current, regulated performance. |
Applications
| Industrial RS-232 Power Supply | Data Acquisition Bias Rail |
|---|---|
Use Scenario: Generating isolated −5 V and +5 V rails from a single +5 V or +12 V supply for RS-232 line drivers/receivers in factory-floor PLC modules. IC Role / Device Role / Timing Role: Negative voltage generator with regulation - provides stable, low-noise VEE for MAX232-class transceivers under varying bus load conditions. Use Value: Eliminates need for dual-output DC/DC converters; 100 mA output supports multiple transceiver channels; shutdown mode cuts idle power by >99%. | Use Scenario: Creating a clean, regulated −5 V reference for ADC/DAC biasing and op-amp dual-rail operation in portable test equipment. IC Role / Device Role / Timing Role: Precision negative regulator - uses internal 2.5 V reference and external R1/R2 to fix VOUT at −5.00 V ±0.05 V over temperature and line variation. Use Value: Achieves <±0.1% output drift across 0–70°C; eliminates calibration drift in 16-bit measurement systems; low ESR capacitor support minimizes PSRR degradation. |
| Voltage Inverter for Sensor Excitation | Negative Voltage Doubler |
Use Scenario: Supplying symmetric ±10 V excitation to strain-gauge bridges or piezoelectric sensors in structural health monitoring nodes. IC Role / Device Role / Timing Role: High-efficiency inverter - converts +12 V input to −10 V output with <1.6 V loss, supporting 50 mA continuous sensor bias current. Use Value: Reduces thermal stress vs. linear regulators; OSC pin allows synchronization to data acquisition sampling clock to suppress switching noise coupling into analog signal chain. | Use Scenario: Generating −10 V from +5 V for high-voltage op-amp biasing in audio preamplifier gain stages. IC Role / Device Role / Timing Role: Configurable doubler - wired in negative-doubler topology to deliver |VOUT| ≈ 2×VCC minus switch losses, with regulation maintained via FB/SD feedback. Use Value: Enables rail-splitting from single supply without transformers; supports up to 40 mA at −10 V; external capacitor ratio (CIN:COUT ≈1:10) ensures stable loop response. |
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; 20 mA max output; fixed 10 kHz oscillator; no shutdown pin. | Suitable only for unregulated inversion; cannot replace LT1054CP in feedback-controlled designs. | Select when cost sensitivity outweighs regulation need and load <20 mA. |
| ICL7660CPA | No regulation; 20 mA output; no shutdown; oscillator not synchronizable; higher voltage loss (≈2.5 V at 20 mA). | Limited to low-current, non-critical inversion (e.g., LCD bias); incompatible with precision feedback networks. | Choose only for legacy designs where footprint matches and regulation is unnecessary. |
Compared with LTC1044CN8#PBF and ICL7660CPA, the LT1054CP provides 5× higher output current, integrated regulation, shutdown control, and oscillator flexibility - making it the sole option among the three capable of delivering stable −5 V at 100 mA in RS-232 or data acquisition systems.
Availability
LT1054CP is available at Aetrix Electronics and suitable for industrial communications (RS-232), data acquisition bias rails, and voltage inverter applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1054CP 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 specializing in analog, embedded processing, and power management ICs, with decades of leadership in precision voltage regulation and power conversion.
The LT1054CP belongs to TI's legacy switched-capacitor converter family, engineered specifically for high-current, regulated negative voltage generation in industrial and instrumentation applications where reliability and design simplicity are critical.
FAQ
What is the maximum regulated output current of the LT1054CP?
The LT1054CP delivers up to 100 mA of regulated output current under recommended operating conditions (VCC = 3.5 V to 15 V, TA = 0°C to 70°C). This rating assumes proper external capacitor selection (e.g., 10 μF tantalum CIN, 100 μF COUT) and thermal management. At 100 mA, typical voltage loss is 1.1 V, meaning a 7 V input yields approximately −5.9 V output before regulation. Exceeding 100 mA risks thermal overload and regulation dropout in the LT1054CP.
How does the LT1054CP achieve output voltage regulation?
The LT1054CP achieves regulation using an internal 2.5 V reference and error amplifier. The FB/SD pin serves as the inverting input to this amplifier; connecting an external resistor divider between VOUT and GND sets the regulated output voltage (e.g., R1 = 20 kΩ, R2 = 102.6 kΩ yields −5 V). The amplifier drives internal PNP switches to adjust charge transfer, maintaining constant VOUT despite variations in VCC or load current - a capability absent in non-regulated predecessors like the ICL7660.
Can the LT1054CP be synchronized to an external clock?
Yes, the LT1054CP 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, with a 20 kΩ pull-up to VREF recommended. Synchronization eliminates beat frequencies in noise-sensitive applications such as data acquisition systems. Unlike basic charge pumps, the LT1054CP's oscillator architecture allows both frequency adjustment and hard synchronization without compromising regulation stability.
What is the purpose of the VREF pin on the LT1054CP?
Pin 6 (VREF) on the LT1054CP provides a precision 2.5 V reference output, trimmed to ±0.25 V over temperature. It serves two roles: (1) as the reference for the internal error amplifier during regulation, and (2) as a stable external reference point for feedback dividers or auxiliary circuitry. Reference load must be limited to ≤60 µA to preserve accuracy; shorting VREF to GND draws ~100 µA but does not disrupt regulation - a feature leveraged in OSC synchronization circuits.
Does the LT1054CP support parallel operation for higher current?
Yes, the LT1054CP supports parallel operation to increase total output current beyond 100 mA. Multiple LT1054CP units can share the same CAP+, CAP−, VOUT, and GND nodes while retaining individual VCC and OSC connections. Internal adaptive drive ensures balanced current sharing without external ballast resistors. This configuration maintains regulation integrity and is documented in TI's application notes for high-current RS-232 supplies and multi-channel data acquisition systems.
LT1054CP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 3.5V (-Vin, 2Vin)
- Voltage - Output (Max):
- 26.4V
- Current - Output:
- 100mA
- Frequency - Switching:
- 25kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1054CP FAQ
1.How can I place an order for LT1054CP through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054CP 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 LT1054CP reliable?
The price and inventory of LT1054CP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054CP is usually 5 days.
3.What payment methods are accepted for LT1054CP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054CP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054CP?
LT1054CP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054CP 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 LT1054CP?
For technical support, including LT1054CP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054CP requirements.
6.How does Aetrix verify that LT1054CP is sourced from the original manufacturer or authorized distributors?
All LT1054CP 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 LT1054CP meets industry standards.
7.What is the process for return or replacement of LT1054CP?
All LT1054CP units undergo pre-shipment inspection (PSI). If there is an issue with LT1054CP, 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 LT1054CP part is unused and in its original packaging.
Return procedure for LT1054CP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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