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Texas Instruments LT1054IPE4
- Part No.:
- LT1054IPE4
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1054IPE4.pdf
- Description:
- IC REG CHG PUMP ADJ/-1.25V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:196
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Product details
Overview
LT1054IPE4 from Texas Instruments is a bipolar switched-capacitor voltage converter with integrated regulation, designed as a negative voltage generator (charge pump) for precision DC-DC conversion. It delivers up to 100 mA output current with typical voltage loss of 1.1 V at full load, operates from 3.5 V to 15 V input, and features an internal 2.5 V reference and shutdown capability via FB/SD pin - used in RS-232 interface supplies and data acquisition systems.
For engineers reviewing the LT1054IPE4 datasheet, LT1054IPE4 pinout, LT1054IPE4 application, or LT1054IPE4 equivalent, key selection criteria include regulated negative output capability, oscillator synchronization support, shutdown quiescent current (100 µA), external feedback resistor programming, and PDIP-8 package compatibility with legacy industrial designs.
Technical Context
The LT1054IPE4 implements a four-phase switched-capacitor topology with adaptive switch drive to minimize conduction and switching losses across 10 mA–100 mA loads. Its internal error amplifier compares FB/SD voltage against a trimmed 2.5 V reference, enabling precise output regulation independent of input variation or load changes.
Oscillator frequency is nominally 25 kHz (15–35 kHz over temperature and supply), adjustable via external capacitor on OSC pin or synchronizable to external clock. Shutdown is asserted by pulling FB/SD below ≈0.45 V, disabling switching and reducing supply current to 100 µA while discharging CIN/COUT through the load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100 mA max - supports moderate-power analog rails and interface supplies without external pass devices. |
| Voltage Loss | 1.1 V typ at 100 mA - defines minimum input-to-output differential required for regulation (e.g., ≥6.1 V input for −5 V output). |
| Input Range | 3.5 V to 15 V - enables direct operation from common industrial and telecom supply rails. |
| Reference Voltage | 2.5 V ±0.25 V - stable internal reference used with external R1/R2 divider to set regulated VOUT (e.g., −5 V with R1=20 kΩ, R2=102.5 kΩ). |
| Oscillator Freq | 25 kHz nominal (15–35 kHz) - optimized trade-off between capacitor size, ripple, and switching loss; externally adjustable/synchronizable. |
| Shutdown Current | 100 µA typ - enables low-power sleep modes in battery-backed or intermittent-use systems. |
| Operating Temp | −40°C to +85°C - qualified for extended industrial environments, matching LT1054I grade specification. |
Pinout & Package
LT1054IPE4 is housed in an 8-pin PDIP (Plastic Dual In-line Package) with body dimensions 9.50 mm × 6.35 mm, lead pitch 2.54 mm, and through-hole mounting. The package is RoHS-compliant and rated for industrial temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/SD (Pin 1) | Error amp in / shutdown control | Pull ≤0.45 V to enter shutdown (100 µA IQ); connect to resistor divider for regulated output (e.g., −5 V). |
| CAP+ (Pin 2) | Positive terminal of flying capacitor | Connects to positive plate of external 2 µF timing capacitor; carries bidirectional switch current ≈2× IOUT. |
| GND (Pin 3) | Ground reference | Primary return path for all internal circuits and external capacitors; must be low-impedance. |
| CAP− (Pin 4) | Negative terminal of flying capacitor | Connects to negative plate of external 2 µF capacitor; completes charge-transfer path during switching phases. |
| VOUT (Pin 5) | Regulated negative output | Delivers stabilized negative voltage (e.g., −5 V) referenced to GND; requires 100 µF low-ESR tantalum output capacitor. |
| VREF (Pin 6) | 2.5 V reference output | Provides precision reference for feedback network; max load 60 µA; used to set VOUT = −VREF × (1 + R2/R1). |
| OSC (Pin 7) | Oscillator control | Adjusts or synchronizes internal 25 kHz oscillator; add capacitor to GND to lower freq, or to VREF to raise freq. |
| 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 | Eliminates need for external op-amp and reference in negative supply designs; achieves <50 mV load regulation over 10–100 mA. |
| Adaptive switch drive | Optimizes gate drive strength dynamically to reduce conduction loss at light loads and switching loss at heavy loads. |
| External oscillator sync | Enables noise-sensitive applications to lock switching to system clock, avoiding beat frequencies and EMI peaks. |
| Parallel operation support | Multiple LT1054IPE4 units can share load via synchronized OSC pins and common CAP+/CAP− nodes - scales output current beyond 100 mA. |
| Pin-to-pin compatibility | Direct replacement for LTC1044 and ICL7660 in PDIP-8 footprint, enabling drop-in upgrade to higher current and regulation capability. |
Applications
| Industrial RS-232 Transceivers | Data Acquisition Front-Ends |
|---|---|
Use Scenario: Generating −5 V or −12 V bias for RS-232 line drivers (e.g., MAX232 alternatives) in programmable logic controllers and field instrumentation. IC Role / Device Role / Timing Role: Negative voltage generator with regulation, providing stable rail for level-shifting and driver ICs independent of varying 5 V or 12 V system supplies. Use Value: Enables single-supply microcontroller systems to drive true RS-232 signals without external transformers or isolated DC-DC modules. | Use Scenario: Supplying clean, regulated negative reference voltage for 12-bit+ ADCs and precision op-amps in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Low-noise regulated negative supply source; OSC pin synchronized to ADC sampling clock to suppress switching artifacts in analog measurements. Use Value: Reduces measurement offset drift and improves effective number of bits (ENOB) by minimizing supply-induced common-mode error. |
| Voltage-Inverting Power Supplies | Programmable Reference Generators |
Use Scenario: Converting +5 V or +12 V system rail into −5 V or −12 V for op-amp dual supplies in analog test equipment and audio preamps. IC Role / Device Role / Timing Role: Switched-capacitor inverter with adaptive drive and external capacitor control - configured as unregulated inverter or regulated output via FB/SD feedback. Use Value: Achieves >90% efficiency at 100 mA with minimal BOM count (only 3 external caps), eliminating inductors and reducing EMI vs. inductive converters. | Use Scenario: Creating user-adjustable negative reference voltages (e.g., −2.5 V to −10 V) for calibration sources and programmable gain amplifiers. IC Role / Device Role / Timing Role: Precision reference generator using VREF pin and programmable R1/R2 divider; FB/SD pin enables digital enable/disable control. Use Value: Delivers 2.5 V reference with <10 ppm/°C TC contribution to overall output, supporting <0.1% accuracy over −40°C to +85°C. |
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 −VIN output only; 20 mA max output; no FB/SD pin or VREF output. | Suitable only for basic unregulated inversion; cannot implement closed-loop regulation or shutdown control. | Select when cost and simplicity outweigh need for regulation, higher current, or power management features. |
| ICL7660CPA | Unregulated only; 20 mA output; no reference or error amp; oscillator not synchronizable; wider VIN range (1.5–10 V). | Limited to low-current, non-critical inversion tasks; lacks thermal and load regulation needed for precision analog rails. | Choose for legacy designs where pinout matches but performance requirements are minimal. |
Compared with LTC1044CN8#PBF and ICL7660CPA, the LT1054IPE4 provides 5× higher output current, integrated regulation, 100 µA shutdown mode, and oscillator synchronization - making it the only option among the three capable of delivering stable, programmable negative rails in industrial-grade applications.
Availability
LT1054IPE4 is available at Aetrix Electronics and suitable for industrial communications (RS-232), data acquisition front-ends, and voltage-inverting power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1054IPE4 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, specializing in analog, embedded processing, and silicon technology for industrial, automotive, and communications markets.
The LT1054 product line was developed to deliver high-current, regulated switched-capacitor voltage conversion in through-hole packages for reliability-critical industrial systems where inductor-based solutions are impractical.
FAQ
What is the maximum output current capability of the LT1054IPE4?
The LT1054IPE4 delivers up to 100 mA of continuous regulated output current under recommended operating conditions (VCC = 3.5 V to 15 V, TA = −40°C to +85°C). This rating assumes proper external capacitor selection (100 µF low-ESR tantalum for COUT, 2 µF for CIN) and adequate PCB thermal relief. Exceeding 100 mA risks thermal shutdown or degraded regulation performance in the LT1054IPE4.
How does the LT1054IPE4 achieve output voltage regulation?
The LT1054IPE4 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 it to a resistive divider from VOUT to GND sets the regulated output voltage as VOUT = −VREF × (1 + R2/R1). For example, with R1 = 20 kΩ and R2 = 102.5 kΩ, the LT1054IPE4 regulates to −5.0 V with <50 mV load regulation error.
Can the LT1054IPE4 be synchronized to an external clock?
Yes, the LT1054IPE4 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. A 20 kΩ pull-up to VREF is recommended. Synchronization eliminates beat frequencies and reduces EMI in noise-sensitive applications such as precision data acquisition - a capability not present in earlier charge pumps like the ICL7660 or LTC1044.
What is the purpose of the VREF pin on the LT1054IPE4?
The VREF pin (Pin 6) on the LT1054IPE4 provides a stable 2.5 V ±0.25 V reference output used to bias the external resistor divider that programs regulated VOUT. It sources up to 60 µA for feedback networks and can also serve as a pull-up point for OSC pin synchronization. Its temperature coefficient is intentionally adjusted to compensate for internal drift, ensuring minimal overall TC on the regulated output voltage in the LT1054IPE4.
Does the LT1054IPE4 support parallel operation for higher current?
Yes, the LT1054IPE4 supports parallel operation to increase total output current beyond 100 mA. Multiple LT1054IPE4 units can be synchronized by connecting their OSC pins together and sharing CAP+, CAP−, and VOUT nodes. Texas Instruments confirms this configuration in the datasheet and specifies matched timing and adaptive drive ensure balanced current sharing - a feature absent in non-regulated alternatives like the ICL7660.
LT1054IPE4 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1054IPE4 FAQ
1.How can I place an order for LT1054IPE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054IPE4 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 LT1054IPE4 reliable?
The price and inventory of LT1054IPE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054IPE4 is usually 5 days.
3.What payment methods are accepted for LT1054IPE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054IPE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054IPE4?
LT1054IPE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054IPE4 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 LT1054IPE4?
For technical support, including LT1054IPE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054IPE4 requirements.
6.How does Aetrix verify that LT1054IPE4 is sourced from the original manufacturer or authorized distributors?
All LT1054IPE4 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 LT1054IPE4 meets industry standards.
7.What is the process for return or replacement of LT1054IPE4?
All LT1054IPE4 units undergo pre-shipment inspection (PSI). If there is an issue with LT1054IPE4, 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 LT1054IPE4 part is unused and in its original packaging.
Return procedure for LT1054IPE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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