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Analog Devices Inc. LT1026IS8#PBF
- Part No.:
- LT1026IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1026IS8#PBF.pdf
- Description:
- IC REG CHRG PUMP INV 15MA DL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,856
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Product details
Overview
LT1026IS8#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 rail with no inductors required. It operates across –40°C to +85°C and is used in RS232 power supplies, op amp dual-rail generation, and battery-splitting applications.
For engineers reviewing the LT1026IS8#PBF datasheet, LT1026IS8#PBF pinout, LT1026IS8#PBF application, or LT1026IS8#PBF equivalent, key selection criteria include output voltage range under load, temperature-rated performance, capacitor count and value requirements, and substrate biasing constraints for safe operation.
Technical Context
The LT1026IS8#PBF implements a two-stage charge-pump architecture: first doubling VIN using C1, then inverting the doubled voltage via C2 to produce complementary ±VOUT rails. Its bipolar process eliminates latchup risk and supports up to 36V internal node swing.
Output regulation is unregulated - voltage levels track input and load conditions directly. Positive and negative outputs interact: loading one rail affects ripple and voltage on the other due to shared charge transfer paths and substrate coupling tied to –VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 10V - defines minimum logic-compatible supply and maximum safe operating input without derating. |
| Output Voltage Range | ±7V to ±18V - achievable at no load; drops to ±5.25V/±4.5V at ±10mA (VIN=4V), requiring design margining. |
| Output Current | ≥10mA per rail - sustained current capability before thermal shutdown or excessive voltage droop. |
| Operating Temperature | –40°C to +85°C - industrial-grade rating confirmed by "I" suffix and θJA = 150°C/W (SO-8 package). |
| External Components | Four 1µF capacitors - minimal BOM count; supports down to 0.1µF (reduced performance) or up to 22µF (lower ripple). |
| Substrate Bias Requirement | –VOUT tied to substrate - mandates grounding –VOUT if unused to prevent forward-biasing internal diodes. |
Pinout & Package
LT1026IS8#PBF is housed in an 8-lead plastic small-outline (SO-8, S8 package), 0.150" wide body, with gull-wing leads and JEDEC MS-012AC outline. Pin pitch is 0.050", package thickness ≤ 0.069", and thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1+) | Charge Pump Input | Connects to positive terminal of first flying capacitor (C1); driven by internal oscillator phase. |
| 2 (+VOUT) | Positive Output | Delivers doubled voltage rail; requires external storage capacitor (1µF typical) to ground. |
| 3 (C1–) | Charge Pump Return | Connects to negative terminal of C1; alternately switches between VIN and GND during pumping cycle. |
| 4 (C2+) | Inverter Input | Accepts doubled voltage from +VOUT node; drives second flying capacitor (C2) to generate inverted output. |
| 5 (C2–) | Inverter Return | Connects to negative terminal of C2; alternately switches between +VOUT and –VOUT nodes. |
| 6 (–VOUT) | Negative Output | Delivers inverted rail; substrate is internally tied here - must be grounded if unused. |
| 7 (VIN) | Input Supply | Single positive input (4V–10V); powers both charge pump stages and internal logic. |
| 8 (GND) | Ground Reference | System ground reference for input, control, and output storage capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor DC/DC conversion | Enables compact, EMI-quiet dual-rail generation where magnetics are prohibited or impractical. |
| Bipolar process immunity | Eliminates latchup risk in noisy or transient-prone environments such as industrial bus interfaces. |
| Minimal external components | Only four 1µF ceramic capacitors needed - reduces BOM cost, board area, and assembly complexity. |
| Wide input voltage support | Operates from 4V, enabling direct use with 5V logic rails or partially discharged batteries. |
| Industrial temperature grade | –40°C to +85°C operation verified per LT1026I part marking and SO-8 thermal specs. |
Applications
| RS232 Line Driver Power | Op Amp Dual-Rail Supply |
|---|---|
Use Scenario: Generating ±5V or ±12V from a single 5V microcontroller supply to drive RS232 transceivers like MAX232. IC Role / Device Role / Timing Role: Voltage converter providing isolated dual-polarity rails without transformers or inductors. Use Value: Enables full-duplex RS232 communication from low-voltage logic systems with <10mA per rail demand and minimal footprint. | Use Scenario: Powering precision op amps (e.g., LT1013) requiring symmetric ±V supplies in data acquisition front-ends. IC Role / Device Role / Timing Role: Dual-output charge-pump supplying matched positive/negative rails referenced to system ground. Use Value: Delivers stable ±7V at 10mA with <1% cross-regulation drift, supporting rail-to-rail input/output op amp operation. |
| Battery Voltage Splitting | Portable Instrumentation Bias |
Use Scenario: Splitting a 9V alkaline battery into ±4.5V rails for low-power analog sensor signal conditioning. IC Role / Device Role / Timing Role: Unregulated split-rail generator maintaining output symmetry under varying battery discharge (4V–9V input). Use Value: Extends usable battery life by operating down to 4V input while sustaining >8mA per rail at ±4V output. | Use Scenario: Providing clean ±15V bias for photodiode transimpedance amplifiers in handheld spectrometers. IC Role / Device Role / Timing Role: Low-noise, capacitor-based dual-rail source decoupled from noisy digital sections. Use Value: Achieves <30mVpp ripple with 22µF output caps, meeting noise floor requirements for sub-nA current measurement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1054CS8#PBF | Includes internal voltage regulator and 100mA output; requires different capacitor values and has higher quiescent current (1.5mA vs. 7–30mA). | Supports regulated ±5V/±12V outputs; better for fixed-rail, higher-current loads but less efficient at light loads. | Select LT1054CS8#PBF when regulation stability and >50mA output are required; avoid if minimal component count or ultra-low IQ is critical. |
| LTC1555ES5#TRMPBF | Integrated SIM power supply with step-up/step-down, 2.7V–10V input, 5V output, and ESD protection; not dual-rail capable. | Designed for GSM/UMTS SIM card interfaces; lacks negative output, so unsuitable for op amp or RS232 dual-rail needs. | Select LTC1555ES5#TRMPBF only for single 5V generation in secure comms modules; not a functional substitute for LT1026IS8#PBF's ±VOUT capability. |
Compared with LT1054CS8#PBF and LTC1555ES5#TRMPBF, the LT1026IS8#PBF uniquely delivers unregulated, high-voltage ±VOUT from minimal components and a wide 4V–10V input, making it optimal for space-constrained, inductor-free dual-rail generation where regulation is secondary to simplicity and voltage range.
Availability
LT1026IS8#PBF is available at Aetrix Electronics and suitable for RS232 interface design, op amp dual-supply systems, and portable instrumentation requiring stable component supply across industrial temperature ranges.
Supply support for LT1026IS8#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 switched-capacitor converters known for robustness and wide operating margins.
The LT1026 belongs to Linear's non-regulated charge-pump converter family, designed specifically for low-component-count dual-rail generation in test equipment, industrial interfaces, and portable analog systems where inductors are undesirable.
FAQ
What is the maximum output voltage achievable with LT1026IS8#PBF?
The LT1026IS8#PBF achieves up to ±18V output when VIN = 10V and load current is 0mA. At ±10mA load, output drops to ±16V to ±17.6V (positive) and ±15.3V to ±17V (negative), depending on input voltage. These values are specified over the full –40°C to +85°C range and validated in the official datasheet's Electrical Characteristics table.
Can LT1026IS8#PBF operate from a 3.3V input supply?
No, LT1026IS8#PBF cannot operate reliably from 3.3V. Its absolute minimum input voltage is 4V, and the datasheet specifies guaranteed operation only from 4V to 10V. Attempting 3.3V input results in failure to initiate switching, no output voltage, and possible undefined behavior - confirmed by Absolute Maximum Ratings and Electrical Characteristics tables.
Why must –VOUT be grounded if not used in LT1026IS8#PBF?
In LT1026IS8#PBF, the silicon substrate is internally tied to –VOUT. If –VOUT floats or rises above ground, substrate diodes become forward-biased, causing leakage, latchup risk, or device failure. Grounding –VOUT ensures reverse biasing of all substrate junctions - a mandatory requirement explicitly stated in the Applications Information section of the LT1026 datasheet.
What capacitor types and values are recommended for LT1026IS8#PBF?
LT1026IS8#PBF requires four 1µF ceramic capacitors (X7R or better) as standard: two flying caps (C1, C2) and two output storage caps (+VOUT–GND, –VOUT–GND). The datasheet confirms operation down to 0.1µF (with reduced output current/ripple performance) and up to 22µF (to lower ripple and output impedance). Tantalum or electrolytic caps are not recommended due to ESR and reliability concerns.
Does LT1026IS8#PBF include short-circuit or thermal protection?
No, LT1026IS8#PBF has no built-in short-circuit or thermal protection circuitry. The datasheet explicitly states "No overload protection is included" and warns that sustained shorts cause overheating and potential damage. Momentary shorts (<10 seconds) are tolerated per Absolute Maximum Ratings, but continuous fault conditions require external current limiting or thermal monitoring in the system design.
LT1026IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1026IS8#PBF FAQ
1.How can I place an order for LT1026IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1026IS8#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 LT1026IS8#PBF reliable?
The price and inventory of LT1026IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1026IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1026IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1026IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1026IS8#PBF?
LT1026IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1026IS8#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 LT1026IS8#PBF?
For technical support, including LT1026IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1026IS8#PBF requirements.
6.How does Aetrix verify that LT1026IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1026IS8#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 LT1026IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1026IS8#PBF?
All LT1026IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1026IS8#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 LT1026IS8#PBF part is unused and in its original packaging.
Return procedure for LT1026IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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