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Texas Instruments LT1054IPG4
- Part No.:
- LT1054IPG4
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1054IPG4.pdf
- Description:
- IC REG CHARG PUMP ADJ/3.5V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,348
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Product details
Overview
LT1054IPG4 from Texas Instruments is a bipolar switched-capacitor voltage converter with integrated regulation, designed as a negative voltage generator or regulated inverter. 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 supports external shutdown and oscillator synchronization - used in RS-232 power supplies and precision data acquisition rails.
For engineers reviewing the LT1054IPG4 datasheet, LT1054IPG4 pinout, LT1054IPG4 application, or LT1054IPG4 equivalent, key selection considerations include regulated negative output capability, shutdown quiescent current (100 µA), oscillator frequency adjustability (15–35 kHz), feedback-based output programming, and compatibility with tantalum capacitor networks for low-ESR operation.
Technical Context
The LT1054IPG4 implements a charge-pump topology with adaptive-switch drive to minimize conduction and switching losses across 10–100 mA loads. Its internal error amplifier compares FB/SD voltage against a trimmed 2.5 V reference, enabling precise output regulation via external resistor dividers - independent of input voltage and load variations.
It integrates a self-contained 25 kHz nominal oscillator with external synchronization capability via the OSC pin, and uses dual-phase capacitor switching between CAP+ and CAP− terminals to generate inverted or doubled outputs. Shutdown is asserted by pulling FB/SD below ≈0.45 V, disabling switching and reducing supply current to 100 µA.
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-to-output differential required for regulation (e.g., ≥6.1 V for −5 V output). |
| Input Range | 3.5 V to 15 V - supports wide industrial and legacy logic supply rails without external LDO pre-regulation. |
| Oscillator Freq | 15–35 kHz - adjustable via external capacitor or synchronizable to system clock; optimized for minimal voltage loss. |
| Reference Voltage | 2.5 V ±0.25 V - stable internal reference enables accurate output programming with R1/R2 divider (e.g., −5 V at R2 = 102.5 kΩ). |
| Shutdown Current | 100 µA typical - enables low-power sleep modes in battery-backed or intermittent-use systems. |
| Regulation Accuracy | ±25 mV line regulation, ±50 mV load regulation - ensures stable output under varying input and load conditions. |
Pinout & Package
LT1054IPG4 is housed in an 8-pin PDIP package (9.50 mm × 6.35 mm), rated for −40°C to +85°C operation (I-grade). Pin functions are validated per TI SLVS033G Rev G.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/SD (Pin 1) | Error amp in / shutdown control | Pull ≤0.45 V to disable switching and enter 100 µA shutdown; connect to R1–R2 divider for regulation. |
| CAP+ (Pin 2) | Positive charge pump node | Connects to positive terminal of flying capacitor (C1); carries ~2× output current during charge phase. |
| GND (Pin 3) | Power and signal reference | Common return for VCC, CAP−, and load; must be low-impedance to minimize ripple and regulation error. |
| CAP− (Pin 4) | Negative charge pump node | Connects to negative terminal of flying capacitor (C1); alternately charged/discharged to generate inverted output. |
| VOUT (Pin 5) | Regulated output | Delivers negative voltage (e.g., −5 V) referenced to GND; requires low-ESR COUT (e.g., 100 µF tantalum). |
| VREF (Pin 6) | 2.5 V reference output | Provides stable reference for feedback network; max load 60 µA; temperature-compensated for zero TC output. |
| OSC (Pin 7) | Oscillator timing/sync | Adjust frequency with external cap to ground (↓freq) or cap to VREF (↑freq); sync to external clock via open-collector drive. |
| VCC (Pin 8) | Positive supply input | Accepts 3.5–15 V; powers internal circuitry and charge pump switches; not internally regulated. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Eliminates need for external op-amp and reference in negative rail generation - reduces BOM count and layout area. |
| Adaptive-switch drive | Optimizes efficiency across 10–100 mA loads by dynamically adjusting switch timing - maintains <1.6 V loss over full range. |
| External shutdown | Enables system-level power sequencing and ultra-low standby current (100 µA) without external MOSFET or controller. |
| Oscillator synchronization | Allows noise-sensitive systems to lock switching to master clock - avoids beat frequencies and EMI peaks. |
| Parallel operation support | Multiple LT1054IPG4 devices can share load via synchronized OSC pins - scales output current beyond 100 mA. |
Applications
| RS-232 Transceiver Power | Data Acquisition Bias Supply |
|---|---|
Use Scenario: Generating ±12 V rails for legacy RS-232 interface ICs (e.g., MAX232) from a single 5 V or 12 V supply. IC Role / Device Role / Timing Role: Negative voltage generator providing regulated −12 V output with tight line/load regulation and low ripple. Use Value: Enables single-supply RS-232 operation without transformers or inductors - reduces cost and EMI vs. inductive DC/DC solutions. |
Use Scenario: Providing clean, stable −5 V bias for precision ADC reference buffers or op-amp dual-rail operation in sensor signal chains. IC Role / Device Role / Timing Role: Low-noise regulated inverter delivering 100 mA with <50 mV load regulation and 2.5 V reference accuracy. Use Value: Maintains ADC effective resolution by minimizing reference drift and supply-induced offset errors in high-precision measurement systems. |
| Industrial Sensor Excitation | Programmable Logic Controller (PLC) I/O Isolation |
Use Scenario: Supplying negative excitation voltage for strain gauge bridges or piezoelectric sensors requiring bipolar bias. IC Role / Device Role / Timing Role: Regulated charge-pump inverter with shutdown control - activated only during measurement cycles to conserve power. Use Value: Extends battery life in portable instrumentation by limiting active time; eliminates thermal drift from continuous operation. |
Use Scenario: Generating isolated negative supply for optocoupler LED drivers or digital I/O level-shifting circuits in PLC backplanes. IC Role / Device Role / Timing Role: Compact, capacitor-based negative rail generator compatible with DIN-rail mounted modules where space and heat dissipation are constrained. Use Value: Avoids transformer-based isolation supplies - simplifies certification, reduces footprint, and improves reliability in harsh industrial environments. |
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 |
|---|---|---|---|
| LT1054CPG4 | Commercial-grade (0°C to 70°C) version; identical electrical specs and pinout. | Not qualified for extended temperature industrial use; unsuitable for outdoor or automotive-adjacent deployments. | Select LT1054IPG4 when operating ambient exceeds 70°C or requires −40°C startup capability. |
| LTC1044CSW | No internal regulator; lacks VREF, FB/SD, and shutdown - requires external op-amp for regulation. | Higher design complexity for regulated outputs; limited to unregulated inversion or doubling. | Choose LTC1044CSW only if regulation is unnecessary and board space allows discrete compensation network. |
Compared with LT1054CPG4, the LT1054IPG4 offers guaranteed operation down to −40°C and up to 85°C - critical for industrial automation and remote sensing. Versus LTC1044CSW, it integrates regulation and shutdown, eliminating four external components and improving output accuracy by >10× under load variation.
Availability
LT1054IPG4 is available at Aetrix Electronics and suitable for RS-232 transceiver power, precision data acquisition bias supplies, and industrial sensor excitation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1054IPG4 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 leader specializing in analog, embedded processing, and power management technologies, with decades of heritage in precision linear and power conversion ICs.
The LT1054 product line was engineered to replace inductor-based inverters in space-constrained, low-noise analog systems - targeting industrial communications, test equipment, and sensor interfaces where reliability and regulation accuracy are paramount.
FAQ
What is the maximum output current capability of the LT1054IPG4?
The LT1054IPG4 delivers up to 100 mA of regulated output current under recommended operating conditions (VCC = 3.5 V to 15 V, TA = −40°C to +85°C). At 100 mA, typical voltage loss is 1.1 V; derating is required above this point due to thermal limits - junction temperature must remain ≤135°C. The device's RθJA of 85°C/W in PDIP means sustained 100 mA operation is viable at ambient ≤50°C with no heatsink.
How does the LT1054IPG4 achieve output regulation without an external op-amp?
The LT1054IPG4 achieves regulation using an integrated 2.5 V reference and error amplifier. The FB/SD pin serves as the inverting input to this amplifier; connecting an external resistor divider from VOUT to GND sets the regulated output voltage (e.g., −5 V with R1 = 20 kΩ, R2 = 102.5 kΩ). The amplifier drives internal PNP switches to maintain VFB/SD = VREF, enabling closed-loop control without external components.
Can the LT1054IPG4 be synchronized to an external clock, and how is it implemented?
Yes, the LT1054IPG4 supports external oscillator synchronization via the OSC pin (Pin 7). To synchronize, connect an open-collector gate or NPN transistor emitter to GND and collector to OSC, then drive the base with a square wave at the desired frequency. A 20 kΩ pull-up to VREF is recommended. This avoids beat frequencies in noise-sensitive systems and enables deterministic switching in time-critical applications - confirmed in TI SLVS033G Figure 12.
What capacitor types and values are recommended for stable LT1054IPG4 operation?
TI specifies solid tantalum capacitors for optimal LT1054IPG4 performance: CIN = 10 µF (low-ESR), COUT = 100 µF (low-ESR), and C1 = 0.002 µF ceramic. Tantalum minimizes ESR-related voltage loss - especially critical for CIN, where ESR impact is quadrupled. Aluminum electrolytic may be paralleled with tantalum for cost-sensitive COUT designs, but never substituted alone due to higher ESR and leakage.
Is the LT1054IPG4 pin-compatible with the LTC1044 or ICL7660?
Yes, the LT1054IPG4 is explicitly pin-to-pin compatible with the LTC1044 and ICL7660 in the 8-pin PDIP package, per TI's datasheet Feature section. However, unlike those parts, the LT1054IPG4 adds regulation, shutdown, and a 2.5 V reference - meaning it can directly replace them in inverter applications while enabling new regulated topologies without PCB changes.
LT1054IPG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1054IPG4 FAQ
1.How can I place an order for LT1054IPG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054IPG4 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 LT1054IPG4 reliable?
The price and inventory of LT1054IPG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054IPG4 is usually 5 days.
3.What payment methods are accepted for LT1054IPG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054IPG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054IPG4?
LT1054IPG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054IPG4 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 LT1054IPG4?
For technical support, including LT1054IPG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054IPG4 requirements.
6.How does Aetrix verify that LT1054IPG4 is sourced from the original manufacturer or authorized distributors?
All LT1054IPG4 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 LT1054IPG4 meets industry standards.
7.What is the process for return or replacement of LT1054IPG4?
All LT1054IPG4 units undergo pre-shipment inspection (PSI). If there is an issue with LT1054IPG4, 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 LT1054IPG4 part is unused and in its original packaging.
Return procedure for LT1054IPG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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