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Analog Devices Inc. LT1026CN8#PBF
- Part No.:
- LT1026CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1026CN8#PBF.pdf
- Description:
- IC REG CHARGE PUMP INV DL 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:136
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Product details
Overview
LT1026CN8#PBF from Analog Devices (formerly Linear Technology) is a monolithic switched-capacitor voltage doubler and inverter IC that generates ±7V to ±18V outputs from a single 4V–10V input supply, delivering ≥10mA per output without inductors. It uses bipolar process technology, is latchup-immune, and operates across 0°C to 70°C in an 8-lead PDIP package - commonly used for RS232 power generation and op amp dual-rail biasing.
For engineers reviewing the LT1026CN8#PBF datasheet, LT1026CN8#PBF pinout, LT1026CN8#PBF application, or LT1026CN8#PBF equivalent, key selection criteria include input voltage range (4V–10V), output current capability (≥10mA per rail), capacitor-only external component requirement (four 1µF), absence of inductors, and bipolar-process reliability in noisy industrial signal chains.
Technical Context
The LT1026CN8#PBF implements a two-stage charge-pump architecture: first doubling VIN, then inverting the doubled voltage to produce complementary ±VOUT rails. Its substrate is internally tied to –VOUT, requiring grounding of –VOUT if unused to prevent forward-biasing substrate diodes.
No internal regulation or overload protection exists; output voltage varies with load and input voltage (e.g., ±18V at VIN = 10V, IL = 0mA; ±5.5V at VIN = 5V, IL = –10mA). Ripple is capacitor-dependent - reduced by ≥22µF output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 10V - supports direct use from 5V logic rails or battery inputs down to 4V without brownout. |
| Output Voltage Range | ±7V to ±18V - scalable positive/negative rails determined by VIN and load; e.g., ±18V achievable only at VIN = 10V, no load. |
| Output Current | ≥10mA per rail - sufficient to drive RS232 line drivers or low-power op amps without external buffering. |
| External Components | Four 1µF capacitors - eliminates inductors and simplifies layout; performance degrades gracefully down to 0.1µF. |
| Process Technology | Bipolar - ensures latchup immunity and stable operation in high-noise analog environments. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for embedded instrumentation and interface modules. |
Pinout & Package
LT1026CN8#PBF is housed in an 8-lead narrow-body PDIP (N8) package with 0.300-inch width, JEDEC MS-001 compliant, lead pitch 0.100 inch, and maximum height 0.200 inch. Thermal resistance θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1+) | Charge Pump Input | Connects to +VIN during first phase; forms first doubler stage with C1. |
| 2 (C1–) | Charge Pump Return | Reference node for C1; tied to GND during charging phase. |
| 3 (C2+) | Inverter Input | Accepts doubled voltage from C1; drives C2 during inversion phase. |
| 4 (C2–) | Inverter Return | Reference for C2; tied to –VOUT during inversion to generate negative rail. |
| 5 (–VOUT) | Negative Output | Final inverted output rail; substrate connection point - must be grounded if unused. |
| 6 (GND) | Ground Reference | System ground return; separate from substrate reference (tied to –VOUT). |
| 7 (+VOUT) | Positive Output | Doubled-and-inverted positive rail; not regulated - voltage drops under load. |
| 8 (VIN) | Input Supply | Single positive input (4V–10V); powers both charge pump stages. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage Doubling + Inversion | Generates true complementary ±VOUT rails from one input - enables dual-supply op amps from single 5V logic rail. |
| No Inductor Requirement | Eliminates EMI, size, and cost penalties of magnetic components - ideal for space-constrained PCBs. |
| Latchup Immunity | Bipolar fabrication prevents destructive latchup - critical for mixed-signal systems with transient coupling. |
| Minimal External Parts | Only four 1µF capacitors needed - reduces BOM count, assembly steps, and failure modes vs. inductor-based converters. |
| Substrate Diode Management | Internal substrate tie to –VOUT enforces safe biasing - prevents parasitic conduction when –VOUT is grounded or loaded. |
Applications
| RS232 Line Driver Power | Op Amp Dual-Rail Biasing |
|---|---|
Use Scenario: Generating ±12V rails for legacy RS232 transceivers (e.g., MAX232 replacement) from a 5V microcontroller supply. IC Role / Device Role / Timing Role: Voltage converter providing isolated positive and negative supplies to enable full-swing serial signaling. Use Value: Eliminates need for discrete charge pumps or transformer-based DC/DC - reduces board area by >40% vs. inductor solutions. | Use Scenario: Powering rail-to-rail op amps (e.g., LT1013) in portable data acquisition front-ends where dual supplies are required but only a 5V battery is available. IC Role / Device Role / Timing Role: Non-regulated dual-rail generator supplying precision analog circuitry with matched ±VOUT tracking under light-to-moderate load. Use Value: Maintains >95% output voltage symmetry at 5mA load - critical for offset-sensitive instrumentation amplifiers. |
| Battery Voltage Splitting | Interface Circuit Biasing |
Use Scenario: Splitting a single 9V alkaline battery into ±4.5V rails for low-power sensor signal conditioning in field-deployed IoT nodes. IC Role / Device Role / Timing Role: Low-quiescent, capacitor-based voltage splitter enabling symmetric analog bias without battery imbalance drift. Use Value: Draws only 7mA supply current at VIN = 4V, IL = 0 - extends battery life beyond 200 hours at 1mA system load. | Use Scenario: Providing clean ±7V supplies to analog multiplexers (e.g., ADG508A) and ADC drivers in automated test equipment. IC Role / Device Role / Timing Role: High-voltage charge-pump source supporting 12-bit ADC input ranges requiring ≥±5V full-scale swing. Use Value: Delivers ±6.7V at 10mA load from 5V input - meets SNR requirements for 70dB+ dynamic range systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1054CN8#PBF | Includes internal voltage regulator and 100mA output capability; requires different capacitor values (10µF). | Supports higher current and regulated outputs - suitable where load stability matters more than size or quiescent current. | Select LT1054CN8#PBF when ±5V regulation or >20mA per rail is required; not pin-compatible. |
| LTC1555ES5#TRPBF | Step-up/step-down SIM power supply in SOT-23; integrates short-circuit and overtemperature protection; 2.7V–10V input. | Designed for cellular modem power management - includes level translation and ESD hardening (>10kV). | Choose LTC1555ES5#TRPBF for portable comms designs needing fault tolerance and ultra-small footprint; different topology and pinout. |
Compared with LT1026CN8#PBF, LT1054CN8#PBF trades simplicity and low IQ for regulation and higher current, while LTC1555ES5#TRPBF replaces capacitor-based topology with integrated switching regulation and protection - making LT1026CN8#PBF optimal for cost-sensitive, low-noise, inductor-free dual-rail generation where moderate load variation is acceptable.
Availability
LT1026CN8#PBF is available at Aetrix Electronics and suitable for RS232 interface design, op amp biasing, and battery-powered instrumentation requiring stable component supply with long-term obsolescence planning.
Supply support for LT1026CN8#PBF 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
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio, including legacy bipolar-switched capacitor ICs known for robustness and noise resilience.
The LT1026 belongs to Linear's non-regulated charge-pump converter family, designed specifically for inductor-free dual-rail generation in space-constrained analog signal chains and legacy interface circuits.
FAQ
What is the minimum input voltage required for reliable operation of the LT1026CN8#PBF?
The LT1026CN8#PBF operates reliably down to 4V input voltage across its full 0°C to 70°C temperature range. At VIN = 4V and zero load, it delivers ±6.5V (positive) and ±6V (negative); output voltage scales linearly with input, so lower VIN yields proportionally lower rails. Operation below 4V is not characterized and may result in failure to initiate charge pumping.
Can the LT1026CN8#PBF be used without connecting the –VOUT pin?
No - the LT1026CN8#PBF substrate is internally tied to –VOUT, and leaving –VOUT floating risks forward-biasing substrate diodes, causing malfunction or damage. If only +VOUT is needed (e.g., voltage doubler mode), –VOUT must be connected directly to ground to maintain proper substrate biasing and ensure safe operation.
What capacitor values are recommended for optimal ripple performance with the LT1026CN8#PBF?
For minimal ripple (<5mVP-P) and lowest output impedance, 22µF tantalum or low-ESR ceramic capacitors are recommended on all four positions (C1+, C1–, C2+, C2–). The LT1026CN8#PBF functions with 1µF as standard, but ripple increases significantly below 10µF; performance remains functional down to 0.1µF at reduced current and higher ripple.
Does the LT1026CN8#PBF include built-in short-circuit or thermal protection?
No - the LT1026CN8#PBF has no internal short-circuit or thermal protection circuitry. Momentary shorts do not damage the device, but sustained overloads cause excessive junction heating due to unregulated current flow. Designers must limit continuous output current and ensure adequate PCB copper area or heatsinking to keep TJ ≤ 150°C under worst-case load conditions.
Is the LT1026CN8#PBF pin-compatible with other members of the LT1026 family such as LT1026CS8#PBF?
Yes - the LT1026CN8#PBF shares identical pinout and electrical functionality with LT1026CS8#PBF (SO-8), LT1026CJ8#PBF (CERDIP), and LT1026CH#PBF (TO-5 metal can). All variants use the same 8-pin configuration and terminal assignments; only package type, thermal resistance, and moisture sensitivity differ - allowing drop-in substitution where mechanical constraints permit.
LT1026CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 15mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1026CN8#PBF FAQ
1.How can I place an order for LT1026CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1026CN8#PBF 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 LT1026CN8#PBF reliable?
The price and inventory of LT1026CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1026CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1026CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1026CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1026CN8#PBF?
LT1026CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1026CN8#PBF 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 LT1026CN8#PBF?
For technical support, including LT1026CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1026CN8#PBF requirements.
6.How does Aetrix verify that LT1026CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1026CN8#PBF 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 LT1026CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1026CN8#PBF?
All LT1026CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1026CN8#PBF, 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 LT1026CN8#PBF part is unused and in its original packaging.
Return procedure for LT1026CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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