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Texas Instruments LT1054CDWR
- Part No.:
- LT1054CDWR
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1054CDWR.pdf
- Description:
- IC REG CHRG PUMP ADJ/3.5V 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
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Product details
Overview
LT1054CDWR from Texas Instruments is a bipolar switched-capacitor voltage converter with integrated regulation, delivering up to 100 mA output current at ≤1.6 V voltage loss across 3.5–15 V input range. It features an internal 2.5 V reference, external shutdown via FB/SD pin, and oscillator synchronization capability. It is used in RS-232 interface supplies requiring stable negative rail generation.
For engineers reviewing the LT1054CDWR datasheet, LT1054CDWR pinout, LT1054CDWR application, or LT1054CDWR equivalent, key selection criteria include regulated negative output capability, 25 kHz nominal switching frequency, shutdown quiescent current of 100 µA, compatibility with 10 µF/100 µF tantalum capacitor networks, and SOIC-16 package thermal resistance of 57 °C/W.
Technical Context
The LT1054CDWR implements a charge-pump topology with adaptive-switch drive to minimize conduction and switching losses across 10–100 mA load range. Its error amplifier compares FB/SD voltage against a trimmed 2.5 V internal reference to regulate output via external resistor divider (e.g., R1 = 20 kΩ, R2 = 102.5 kΩ for –5 V).
Oscillator frequency is internally set to 25 kHz (15–35 kHz over temperature) and adjustable via external capacitors on OSC pin; synchronization is supported by open-collector drive into OSC with 20 kΩ pull-up to VREF. Shutdown mode disables switching and reduces 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 regulated output - supports RS-232 driver stages and analog front-end bias rails. |
| Voltage loss | 1.1 V typical at 100 mA - enables efficient –5 V generation from 6 V input without excessive heat rise. |
| Input range | 3.5 V to 15 V - compatible with 5 V, 9 V, and 12 V system rails without external LDO pre-regulation. |
| Reference voltage | 2.5 V ±0.25 V - provides stable feedback node for precision output programming with <50 mV load regulation error. |
| Oscillator freq | 25 kHz nominal (15–35 kHz) - balances EMI, capacitor size, and voltage loss; externally adjustable/synchronizable. |
| Shutdown current | 100 µA - enables low-power sleep modes in portable instrumentation and sensor nodes. |
| Thermal resistance | 57 °C/W (SOIC-16) - allows 1 W dissipation with ≤57 °C rise above ambient under continuous 100 mA operation. |
Pinout & Package
LT1054CDWR is housed in a 16-pin SOIC (DW package), 10.30 mm × 10.30 mm body, with 1.27 mm pitch and exposed pad not present. Pin 1 is marked by notch or dot; pins 1, 2, 7, 8, 9, 10, 15, and 16 are no-connect (NC) internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/SD (Pin 3) | Error amp in / shutdown control | Pull below 0.45 V to enter 100 µA shutdown; connect to resistive divider for regulated output voltage setting. |
| CAP+ (Pin 4) | Positive charge pump node | Connects to positive terminal of flying capacitor (C1 = 0.002 µF); carries ~2× output current during charge phase. |
| GND (Pin 5) | Power and signal reference | Common return for VCC, CAP−, and load; must be low-impedance to minimize ripple coupling. |
| CAP− (Pin 6) | Negative charge pump node | Connects to negative terminal of flying capacitor; alternately charged/discharged to generate inverted output. |
| VOUT (Pin 11) | Regulated negative output | Delivers –5 V (or other programmed value) to load; requires 100 µF low-ESR tantalum for <50 mV load regulation. |
| VREF (Pin 12) | 2.5 V precision reference | Stable 2.5 V source for feedback divider; limited to ≤60 µA sink to maintain accuracy and TC performance. |
| OSC (Pin 13) | Oscillator timing/sync | Internal 150 pF capacitor node; add C1 to GND to lower freq, C2 between CAP+ and OSC to raise freq, or sync with external clock. |
| VCC (Pin 14) | Positive supply input | Accepts 3.5–15 V; powers internal logic, drivers, and reference; bypass with 0.1 µF ceramic near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Eliminates need for external op-amp and reference; achieves ±50 mV line/load regulation with simple resistor divider. |
| Adaptive-switch drive | Optimizes gate drive strength dynamically to reduce conduction loss at light loads and switching loss at heavy loads. |
| External shutdown | Reduces total system standby power by disabling all internal switching and reference circuitry, retaining only leakage paths. |
| Oscillator synchronization | Enables noise-sensitive systems (e.g., ADC reference supplies) to lock switching to master clock, avoiding beat frequencies. |
| Parallel operation support | Multiple LT1054CDWR units can share load via common VOUT and synchronized OSC, increasing available current beyond 100 mA. |
Applications
| Industrial RS-232 Transceivers | Data Acquisition Bias Rails |
|---|---|
Use Scenario: Providing isolated –5 V and +5 V rails for MAX232-class transceivers in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Negative voltage generator and regulator supplying clean, load-stable –5 V to RS-232 driver stages. Use Value: Enables single-supply 5 V systems to meet RS-232 voltage swing requirements (±5 V to ±15 V) without transformer-based DC/DC. | Use Scenario: Generating precision –5 V reference for 16-bit SAR ADC front-ends in portable environmental sensors. IC Role / Device Role / Timing Role: Regulated negative supply for ADC analog ground and reference buffer circuitry. Use Value: Delivers <10 mV ripple and <50 mV load regulation error, preserving ENOB in high-resolution data acquisition. |
| Voltage Inverter for Op-Amp Supplies | Negative Voltage Doubler |
Use Scenario: Creating dual ±12 V rails from a single 12 V input for rail-to-rail op-amp signal conditioning in test equipment. IC Role / Device Role / Timing Role: Inverting charge pump configured as regulated –12 V source with feedback loop. Use Value: Achieves 100 mA output at <1.6 V loss, enabling compact, low-heat dual-rail design without inductors or transformers. | Use Scenario: Generating –10 V from +5 V for EEPROM programming voltage in embedded microcontroller systems. IC Role / Device Role / Timing Role: Negative doubler topology using external capacitor reconfiguration and no feedback. Use Value: Provides doubled negative output (–2×VIN) at reduced current (≤50 mA), suitable for infrequent high-voltage pulses. |
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 |
|---|---|---|---|
| MAX1044CPA+ | Same 8-pin PDIP footprint; 10 mA max output; no internal reference or regulation; fixed 10 kHz oscillator. | Unregulated inverter only; unsuitable for precision –5 V rails requiring load/line regulation. | Select when cost and board space are critical and regulation is unnecessary. |
| LTC1044CSW#PBF | Pin-compatible SOIC-16; 20 mA output; no regulation; 10 kHz oscillator; higher quiescent current (1.5 mA). | Lacks FB/SD and VREF pins; cannot implement closed-loop regulation or shutdown. | Choose for legacy designs migrating from LTC1044 where regulation is handled externally. |
Compared with LT1054CDWR, MAX1044CPA+ offers lower cost but sacrifices regulation, output current, and frequency flexibility; LTC1044CSW#PBF matches package and pin count but omits key regulation and low-power features required for modern embedded systems.
Availability
LT1054CDWR is available at Aetrix Electronics and suitable for industrial communications, data acquisition systems, and analog signal conditioning requiring stable component supply with guaranteed long-term sourcing.
Supply support for LT1054CDWR 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 signal solutions for industrial, automotive, and communications markets.
The LT1054 product line was developed to deliver regulated switched-capacitor voltage conversion without inductors, targeting space-constrained and EMI-sensitive applications such as portable instrumentation and RS-232 interfaces.
FAQ
What is the maximum output current capability of the LT1054CDWR in regulated mode?
The LT1054CDWR delivers up to 100 mA of continuous regulated output current when operating within its recommended input voltage range (3.5 V to 15 V) and junction temperature limits. At 100 mA, typical voltage loss is 1.1 V, rising to 1.6 V maximum across temperature. Exceeding this current risks thermal shutdown or degraded regulation accuracy due to increased output resistance and ripple.
How does the LT1054CDWR achieve output voltage regulation?
The LT1054CDWR 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 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 constant voltage across the flying capacitor network, compensating for input and load variations.
Can the LT1054CDWR be synchronized to an external clock signal?
Yes, the LT1054CDWR supports external oscillator synchronization via the OSC pin (Pin 13). An open-collector gate or NPN transistor can drive OSC low at the desired system clock frequency, with a 20 kΩ pull-up to VREF (Pin 12) recommended. This avoids beat frequencies in noise-critical applications like ADC reference supplies and ensures deterministic switching timing.
What capacitor types and values are recommended for stable LT1054CDWR operation?
For stable LT1054CDWR operation, use low-ESR solid tantalum capacitors: 10 µF for CIN (CAP+/CAP−), 100 µF for COUT (VOUT to GND), and 0.002 µF for C1 (between CAP+ and CAP−). Aluminum electrolytics may supplement COUT for cost-effective bulk capacitance, but must be paralleled with tantalum to maintain low ESR. Ceramic bypass (0.1 µF) is required at VCC.
Does the LT1054CDWR support parallel operation to increase output current?
Yes, the LT1054CDWR supports parallel operation: multiple units can share a common VOUT node and synchronized OSC signals to scale output current beyond 100 mA. To ensure current sharing, match external components (capacitors, resistors) and route OSC and VOUT traces with equal length and impedance. Thermal derating is required - each additional LT1054CDWR contributes its own 57 °C/W θJA to total system thermal resistance.
LT1054CDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
LT1054CDWR FAQ
1.How can I place an order for LT1054CDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054CDWR 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 LT1054CDWR reliable?
The price and inventory of LT1054CDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054CDWR is usually 5 days.
3.What payment methods are accepted for LT1054CDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054CDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054CDWR?
LT1054CDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054CDWR 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 LT1054CDWR?
For technical support, including LT1054CDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054CDWR requirements.
6.How does Aetrix verify that LT1054CDWR is sourced from the original manufacturer or authorized distributors?
All LT1054CDWR 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 LT1054CDWR meets industry standards.
7.What is the process for return or replacement of LT1054CDWR?
All LT1054CDWR units undergo pre-shipment inspection (PSI). If there is an issue with LT1054CDWR, 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 LT1054CDWR part is unused and in its original packaging.
Return procedure for LT1054CDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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