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Analog Devices Inc. LT1026CS8#PBF
- Part No.:
- LT1026CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1026CS8#PBF.pdf
- Description:
- IC REG CHRG PUMP INV 15MA DL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
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Product details
Overview
LT1026CS8#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 serves as a compact dual-rail power source for op amp biasing, RS232 interface circuitry, and battery-splitting applications.
For engineers reviewing the LT1026CS8#PBF datasheet, LT1026CS8#PBF pinout, LT1026CS8#PBF application, or LT1026CS8#PBF equivalent, key selection criteria include output voltage range under load, capacitor count and value requirements, latchup immunity, thermal performance in SO-8, and compatibility with logic-supply-derived bipolar rails.
Technical Context
The LT1026CS8#PBF implements a two-stage charge-pump architecture: first doubling VIN using C1, then inverting the doubled voltage via C2 to produce symmetrical ±VOUT rails. Its bipolar process ensures inherent latchup immunity and supports substrate biasing tied to –VOUT.
Operation requires only four external 1µF capacitors-two flying (C1, C2) and two output storage-and exhibits load-dependent regulation: e.g., at VIN = 5V and ±10mA load, +VOUT = 6.25–7.2V and –VOUT = –5.5 to –6.5V, with ripple reduced by increasing capacitor values to 22µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 10V - Enables direct use from 5V logic rails or 9V batteries without pre-regulation. |
| Output Voltage Range | ±7V to ±18V - Supports wide analog signal swing for op amps and line drivers requiring dual supplies. |
| Output Current | ≥10mA per rail - Sufficient for driving multiple low-power op amps or RS232 transceivers. |
| Capacitor Requirement | Four 1µF ceramic capacitors - Eliminates inductors and simplifies layout versus inductive DC/DC converters. |
| Package | 8-Lead Plastic SO (S8) - Surface-mount compatible with standard reflow profiles; θJA = 150°C/W. |
| Operating Temp | 0°C to 70°C - Rated for commercial temperature environments including industrial control panels. |
| Latchup Immunity | Bipolar process - Guarantees no latchup under transient overloads or supply sequencing stress. |
Pinout & Package
LT1026CS8#PBF is housed in an 8-lead plastic small-outline (SO-8, narrow 0.150") package with gull-wing leads. The package is RoHS-compliant and features a thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1+) | Flying capacitor positive terminal | Connects to positive plate of first charge pump capacitor (C1); toggles between VIN and ground during switching cycle. |
| 2 (+VOUT) | Positive output rail | Delivers doubled input voltage; requires external 1µF storage capacitor to ground. |
| 3 (C1–) | Flying capacitor negative terminal | Connects to negative plate of C1; toggles between ground and –VOUT node. |
| 4 (C2+) | Second flying capacitor positive terminal | Connected to +VOUT during inversion phase; drives C2 to generate inverted output. |
| 5 (C2–) | Second flying capacitor negative terminal | Switched between +VOUT and –VOUT; completes inversion stage of charge pump. |
| 6 (–VOUT) | Negative output rail | Delivers inverted doubled voltage; substrate tied to this pin for latchup protection. |
| 7 (VIN) | Positive input supply | Accepts 4V–10V unregulated input; powers internal oscillator and charge pump drivers. |
| 8 (GND) | Analog ground reference | Return path for input supply and output storage capacitors; must be low-impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail generation from single supply | Eliminates need for separate positive/negative supplies in portable instrumentation and sensor interfaces. |
| No inductor requirement | Reduces EMI, board area, and BOM cost compared to inductive boost/invert topologies. |
| 10mA minimum output per rail | Supports concurrent operation of multiple low-power analog stages without external buffering. |
| Substrate tied to –VOUT | Ensures reverse biasing of parasitic diodes across temperature and load, preventing latchup. |
| Wide input voltage range (4V–10V) | Accommodates aging batteries or variable logic rails while maintaining regulated dual outputs. |
Applications
| Op Amp Dual-Supply Biasing | RS232 Line Driver Power |
|---|---|
Use Scenario: Providing ±12V rails to rail-to-rail op amps in data acquisition front-ends powered from a 5V microcontroller system. IC Role / Device Role / Timing Role: Voltage converter generating isolated dual supplies without magnetic components. Use Value: Enables high-precision analog signal conditioning using standard op amps while avoiding inductor-induced noise and layout complexity. | Use Scenario: Supplying ±5V to MAX232-compatible line drivers in embedded serial communication modules. IC Role / Device Role / Timing Role: Compact bipolar supply generator meeting RS232 voltage compliance with minimal external parts. Use Value: Achieves full RS232 voltage swing (±5V min) from a single 5V logic supply using only four 1µF caps-no inductors or transformers required. |
| Battery Voltage Splitting | Portable Instrumentation Power |
Use Scenario: Splitting a 9V alkaline battery into ±4.5V rails for low-power analog sensors and signal chain ICs in handheld test equipment. IC Role / Device Role / Timing Role: Non-isolated bipolar supply splitter enabling symmetric analog bias from asymmetric source. Use Value: Doubles usable battery energy by supporting true bipolar analog circuits without dedicated negative regulators or charge pumps on separate ICs. | Use Scenario: Powering low-noise instrumentation amplifiers and ADC drivers in portable medical devices operating from 3.3V or 5V battery packs. IC Role / Device Role / Timing Role: Low-EMI dual-rail generator optimized for noise-sensitive analog signal paths. Use Value: Delivers stable ±7V rails with <10mVpp ripple (at 22µF caps) for precision analog stages where inductor-based converters introduce switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1054CS8#PBF | Integrated regulator; delivers regulated ±5V at up to 100mA; higher quiescent current (1.5mA vs. 7–30mA). | Used where stable, load-invariant output is critical (e.g., reference buffers), not just raw voltage scaling. | Select LT1054CS8#PBF when regulation accuracy and higher current outweigh size/cost constraints. |
| LTC1555ES5#TRPBF | Step-up/step-down SIM power supply; generates 5V from 2.7–10V input; includes ESD and short-circuit protection. | Targeted at cellular modem power management-not dual-rail generation-lacks native ±VOUT capability. | Choose LTC1555ES5#TRPBF only for single-rail 5V generation with protection; not a functional substitute for LT1026CS8#PBF's dual-rail topology. |
Compared with LT1026CS8#PBF, LT1054CS8#PBF offers regulation and higher current but larger solution size and no ±18V capability; LTC1555ES5#TRPBF provides protected single-rail output but cannot replace dual-rail generation-making LT1026CS8#PBF uniquely suited for unregulated, high-voltage, inductorless bipolar supply synthesis.
Availability
LT1026CS8#PBF is available at Aetrix Electronics and suitable for RS232 interface design, op amp biasing, and portable instrumentation requiring stable component supply with long-term manufacturability.
Supply support for LT1026CS8#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 legacy precision analog portfolio, emphasizing high-performance signal conditioning and power management ICs.
The LT1026 product line was designed for inductorless dual-rail generation in space-constrained analog systems-targeting instrumentation, interface ICs, and portable equipment where magnetic components are undesirable.
FAQ
What is the maximum output voltage achievable with LT1026CS8#PBF?
The LT1026CS8#PBF delivers up to ±18V output when VIN = 10V and unloaded. Under ±10mA load, typical +VOUT is 15–17.6V and –VOUT is –14.25 to –15.75V. Output voltage scales linearly with input voltage and decreases predictably with load current per the datasheet's electrical characteristics table.
Can LT1026CS8#PBF operate from a 3.3V input supply?
No. The LT1026CS8#PBF has a minimum input voltage of 4V per Absolute Maximum Ratings and Electrical Characteristics tables. At VIN < 4V, the internal oscillator and charge pump drivers fail to sustain reliable switching, resulting in unstable or zero output. For 3.3V systems, consider the LTC1555 or LT1044 instead.
Is LT1026CS8#PBF pin-compatible with LT1026CN8#PBF?
Yes. Both LT1026CS8#PBF and LT1026CN8#PBF share identical pinout and electrical specifications-the only difference is package type (SO-8 vs. PDIP). Layout adaptation is required for mounting, but schematic design, capacitor placement, and functionality remain fully interchangeable.
Does LT1026CS8#PBF require special PCB layout considerations for EMI reduction?
Yes. To minimize switching noise, place all four 1µF capacitors within 5mm of their respective pins, use short wide traces for C1/C2 flying paths, and route +VOUT/–VOUT away from sensitive analog nodes. Avoid shared ground vias between GND and –VOUT, since the substrate is tied to –VOUT and improper grounding risks forward-biasing parasitic diodes.
What happens if –VOUT is left floating in LT1026CS8#PBF applications?
If –VOUT is left floating, the substrate diodes become improperly biased, risking latchup or erratic behavior-even at room temperature. The datasheet mandates tying –VOUT to ground if unused (e.g., in voltage-doubler-only mode) to maintain reverse bias across all substrate junctions. Leaving it open violates absolute maximum ratings and may cause permanent damage.
LT1026CS8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1026CS8#PBF FAQ
1.How can I place an order for LT1026CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1026CS8#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 LT1026CS8#PBF reliable?
The price and inventory of LT1026CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1026CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1026CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1026CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1026CS8#PBF?
LT1026CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1026CS8#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 LT1026CS8#PBF?
For technical support, including LT1026CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1026CS8#PBF requirements.
6.How does Aetrix verify that LT1026CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1026CS8#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 LT1026CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1026CS8#PBF?
All LT1026CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1026CS8#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 LT1026CS8#PBF part is unused and in its original packaging.
Return procedure for LT1026CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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