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Analog Devices Inc. LT1026CS8#TRPBF
- Part No.:
- LT1026CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1026CS8#TRPBF.pdf
- Description:
- IC REG CHRG PUMP INV 15MA DL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,505
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Product details
Overview
LT1026CS8#TRPBF 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 in bipolar technology, is latchup-immune, and targets dual-rail analog subsystems powered from logic supplies.
For engineers reviewing the LT1026CS8#TRPBF datasheet, LT1026CS8#TRPBF pinout, LT1026CS8#TRPBF application, or LT1026CS8#TRPBF equivalent, key selection criteria include output voltage range under load, capacitor count and value (1µF typical), thermal performance in SO-8 (θJA = 150°C/W), and substrate biasing requirements for safe operation.
Technical Context
The LT1026CS8#TRPBF implements a two-stage charge-pump architecture: first doubling VIN, then inverting the doubled voltage to produce complementary ±VOUT rails. Its bipolar process eliminates latchup risk and supports up to 36V internal node swing.
Output regulation is non-switching and load-dependent - voltage accuracy degrades with increasing current (e.g., ±6.25V/±5.5V at ±10mA with VIN = 5V), and cross-loading between rails affects both magnitude and stability. Substrate is internally tied to –VOUT, requiring grounding of –VOUT if unused to prevent forward-biasing substrate diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 10V - defines minimum logic-supply compatibility and maximum internal stress limit |
| Output Voltage Range | ±7V to ±18V (no load); ±5.25V/±4.5V at ±10mA with VIN = 4V - sets usable headroom for op-amp rails or RS232 drivers |
| Output Current | ≥10mA per rail - sufficient for low-power op-amps, line drivers, or data acquisition front-ends |
| External Components | Four 1µF capacitors - eliminates inductors and simplifies layout versus inductive DC/DC converters |
| Package Thermal Resistance | θJA = 150°C/W (SO-8) - requires derating above ~40mA total output current in still air |
| Operating Temperature | 0°C to 70°C (C-grade) - suitable for commercial industrial and instrumentation applications |
| Process Technology | Bipolar - ensures inherent latchup immunity and stable operation across voltage transients |
Pinout & Package
LT1026CS8#TRPBF is housed in an 8-lead plastic small-outline (SO-8, narrow 0.150") package with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1+) | Charge pump stage 1 positive terminal | Connects to +VIN via 1µF flying capacitor C1; critical path for voltage doubling efficiency |
| 2 (+VOUT) | Positive regulated output | Delivers +2×VIN (inverted or direct); must be decoupled with 1µF storage capacitor |
| 3 (C1−) | Charge pump stage 1 negative terminal | Reference node for C1; ties to GND during first half-cycle of switching |
| 4 (C2+) | Charge pump stage 2 positive terminal | Accepts doubled voltage from C1; drives inversion stage to generate –VOUT |
| 5 (C2−) | Charge pump stage 2 negative terminal | Reference for C2; connects to +VOUT during second half-cycle |
| 6 (–VOUT) | Negative regulated output | Delivers –2×VIN; substrate is internally tied here - must be grounded if unused |
| 7 (VIN) | Positive input supply | Single input rail (4V–10V); powers both charge pump stages |
| 8 (GND) | Analog ground reference | System return for input, flying caps, and output storage caps; separate from substrate reference |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor dual-rail generation | Enables compact ±V power from 5V logic rails without EMI-prone magnetics or layout-sensitive inductors |
| Latchup-immune bipolar process | Allows safe operation in noisy environments and mixed-signal systems without system-level latchup mitigation |
| Substrate bias control | Internal tie of substrate to –VOUT prevents parasitic conduction - mandates –VOUT grounding when unused |
| Low-component-count topology | Only four 1µF ceramic capacitors needed - reduces BOM cost, board area, and assembly steps vs. regulator-based solutions |
| Wide input voltage support | Operates down to 4V, enabling use with partially discharged batteries or marginally regulated 5V supplies |
Applications
| RS232 Line Driver Power | Op-Amp Dual-Rail Supply |
|---|---|
Use Scenario: Generating ±5V to ±15V for RS232 transceivers (e.g., MAX232 replacement) from a single 5V microcontroller supply. IC Role / Device Role / Timing Role: Voltage converter providing isolated negative and boosted positive rails for driver IC biasing. Use Value: Eliminates need for external charge-pump ICs or transformer-based isolated supplies while maintaining signal integrity over long cables. | Use Scenario: Powering precision op-amps (e.g., LT1013, OP27) in portable data loggers where only a 5V battery is available. IC Role / Device Role / Timing Role: Dual-output charge-pump supplying symmetric analog rails for rail-to-rail input/output operation. Use Value: Enables true bipolar signal handling without compromising PSRR or introducing magnetic coupling noise from inductive converters. |
| Battery Voltage Splitting | Interface Circuit Biasing |
Use Scenario: Splitting a single Li-ion cell (3.0–4.2V) into ±1.5V rails for low-voltage sensor front-ends or ADC references. IC Role / Device Role / Timing Role: Non-regulated voltage splitter converting asymmetric input into balanced low-current outputs. Use Value: Provides stable mid-point reference and auxiliary bias without resistive divider losses or active regulator quiescent current. | Use Scenario: Supplying ±12V to analog multiplexers (e.g., ADG508A) or programmable gain amplifiers in automated test equipment. IC Role / Device Role / Timing Role: Auxiliary rail generator supporting wide-swing analog switching and gain control circuitry. Use Value: Maintains channel isolation and on-resistance consistency across temperature by avoiding shared ground bounce with digital sections. |
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 |
|---|---|---|---|
| LT1054CS8#TRPBF | Includes internal linear regulator; delivers up to 100mA with tighter output regulation (±1%) but higher IQ (1.5mA) | Preferred for high-current, low-noise analog rails where ripple < 20mVp-p is required | Select LT1054CS8#TRPBF when load exceeds 15mA or regulation error must stay below ±2% across temperature |
| LTC1555ES5#TRMPBF | Step-up/step-down SIM power supply in SOT-23; integrates short-circuit and overtemperature protection; 2.7V–10V input | Targeted at mobile SIM card interfaces needing robust fault tolerance and ultra-small footprint | Choose LTC1555ES5#TRMPBF for space-constrained designs requiring built-in protection and 5V output capability |
Compared with LT1026CS8#TRPBF, LT1054CS8#TRPBF trades higher quiescent current and larger SO-8 footprint for regulated output and 10× higher current, while LTC1555ES5#TRMPBF sacrifices dual-rail flexibility for integrated safety features and minimal PCB area - neither is pin-compatible, and all require distinct capacitor networks and layout review.
Availability
LT1026CS8#TRPBF is available at Aetrix Electronics and suitable for RS232 interface power, op-amp dual-rail supply, and battery-splitting applications requiring stable component supply and long-term industrial availability.
Supply support for LT1026CS8#TRPBF 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 high-reliability charge-pump ICs designed for industrial and instrumentation markets.
The LT1026 product line was engineered to replace discrete charge-pump circuits in analog signal chains, emphasizing latchup immunity, predictable load-dependent output behavior, and minimal external component count for dual-rail generation.
FAQ
What is the maximum output voltage achievable with LT1026CS8#TRPBF?
The LT1026CS8#TRPBF delivers up to ±18V output when VIN = 10V and no load is applied. Under 10mA load per rail, typical output drops to ±16V to ±17V depending on input voltage and capacitor quality. Absolute maximum ratings limit V+ to +20V and V– to –20V, so sustained operation above ±18V is not recommended.
Can LT1026CS8#TRPBF operate from a 3.3V input supply?
No - the LT1026CS8#TRPBF has a minimum specified input voltage of 4V per Absolute Maximum Ratings and Electrical Characteristics tables. At 3.3V, internal charge transfer fails to sustain full output swing, and device behavior becomes undefined. For 3.3V systems, consider LT1054L or LTC1555 instead.
Why must –VOUT be grounded if not used in LT1026CS8#TRPBF?
The LT1026CS8#TRPBF substrate is internally tied to –VOUT. If –VOUT floats or rises above GND, substrate diodes become forward-biased, causing leakage, latchup risk, or catastrophic failure. Grounding –VOUT ensures reverse biasing of all substrate junctions - a mandatory design requirement confirmed in Applications Information section.
What capacitor type and value are recommended for LT1026CS8#TRPBF?
The LT1026CS8#TRPBF specifies 1µF ceramic (X7R or better) for all four external capacitors (C1+, C1−, C2+, C2−). Values as low as 0.1µF function with reduced output current and increased ripple; 22µF lowers ripple and output impedance but increases start-up time. Tantalum or electrolytic caps are not recommended due to ESR and reliability concerns.
Does LT1026CS8#TRPBF include overload or short-circuit protection?
No - the LT1026CS8#TRPBF contains no internal overload protection. Momentary shorts do not damage the IC, but sustained short-circuit conditions cause thermal runaway due to unregulated current flow. External current limiting (e.g., series resistors or polyfuses) and thermal monitoring are required for robust system-level protection.
LT1026CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1026CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1026CS8#TRPBF 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#TRPBF reliable?
The price and inventory of LT1026CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1026CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1026CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1026CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1026CS8#TRPBF?
LT1026CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1026CS8#TRPBF 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#TRPBF?
For technical support, including LT1026CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1026CS8#TRPBF requirements.
6.How does Aetrix verify that LT1026CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1026CS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1026CS8#TRPBF?
All LT1026CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1026CS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1026CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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