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Analog Devices Inc. LTC3261EMSE#TRPBF
- Part No.:
- LTC3261EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3261EMSE#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 100MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,759
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Product details
Overview
LTC3261EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, low-quiescent-current inverting charge pump IC designed for bipolar supply generation in industrial and instrumentation systems. It operates from 4.5V to 32V input, delivers up to 100mA output current, regulates to –VIN in constant-frequency mode or –0.94·VIN in Burst Mode®, and features programmable 50kHz–500kHz switching via external RT resistor.
For engineers reviewing the LTC3261EMSE#TRPBF datasheet, LTC3261EMSE#TRPBF pinout, LTC3261EMSE#TRPBF application, or LTC3261EMSE#TRPBF equivalent, key selection criteria include input voltage range compatibility, quiescent current trade-offs between Burst vs. constant-frequency modes, thermal management requirements for MSOP-12 exposed-pad layout, and output impedance dependence on oscillator frequency and flying capacitor selection.
Technical Context
The LTC3261EMSE#TRPBF implements a four-switch inverting charge pump topology with internal logic-controlled phase sequencing. Its dual-mode operation-Burst Mode® (60µA IQ, hysteretic –0.94·VIN regulation) and constant-frequency mode (50kHz–500kHz, open-loop –VIN inversion)-is selected via the MODE pin and enables optimization for light-load efficiency or low-noise performance.
Switching frequency is set by an external resistor from RT to GND, with 1.2V regulation at RT enabling precise oscillator control. The device integrates short-circuit current limiting (~160mA), thermal shutdown (~175°C trip), soft-start, and undervoltage lockout (3.4V rising threshold), all operating within a –40°C to 125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 32V - supports wide-range industrial rails including 12V, 24V, and 28V systems without pre-regulation. |
| Quiescent Current (Burst Mode) | 60µA - enables multi-year battery life in portable medical or remote sensor bias supplies. |
| Output Current | Up to 100mA - sufficient for op-amp dual-rail biasing, ADC/DAC reference buffers, and analog front-end circuitry. |
| Oscillator Frequency Range | 50kHz to 500kHz - adjustable via RT resistor; higher frequencies reduce effective output impedance (ROL) and improve load transient response. |
| VOUT Regulation Accuracy | –0.94·VIN (Burst Mode), –VIN (Constant-Frequency Mode) - defines output voltage tolerance under varying load and input conditions. |
| Short-Circuit Current Limit | 160mA (typical) - protects downstream circuitry during fault conditions without requiring external current-sense components. |
| Thermal Shutdown Threshold | ~175°C - automatically disables output to prevent permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
The LTC3261EMSE#TRPBF is housed in a thermally enhanced 12-pin MSOP package with an exposed ground pad (Pin 13) that must be soldered to the PCB ground plane for proper thermal performance and electrical functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 3, 6, 7, 12 (NC) | No-connect | Internally unconnected; may be left floating or tied to GND for mechanical stability or EMI reduction. |
| Pin 2 (RT) | Oscillator frequency programming input | Serves at 1.2V; resistor to GND sets switching frequency from 50kHz to 500kHz - critical for optimizing ROL and ripple. |
| Pin 4 (VOUT) | Inverted charge pump output | Delivers regulated negative voltage; polarity and regulation mode depend on MODE pin state and load conditions. |
| Pin 5 (C–) | Flying capacitor negative terminal | High dv/dt node; requires short, low-inductance routing to minimize EMI and switching losses. |
| Pin 8 (C+) | Flying capacitor positive terminal | High dv/dt node paired with C–; forms charge transfer path - ceramic capacitor ≥1µF recommended. |
| Pin 9 (VIN) | Main power input | Accepts 4.5V–32V; requires ≥2µF low-ESR ceramic bypass capacitance close to the pin. |
| Pin 10 (EN) | Enable logic input | Active-high; pulls <2µA in shutdown - enables system-level power sequencing and low-power sleep states. |
| Pin 11 (MODE) | Operating mode select | High = Burst Mode® (low IQ, higher ripple); Low = constant-frequency inversion (lower noise, fixed fOSC). |
| Pin 13 (GND) | Ground / Exposed thermal pad | Primary ground return and thermal path; must be soldered to PCB ground plane with ≥6 vias for θJA = 40°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 60µA while maintaining –0.94·VIN regulation - ideal for always-on instrumentation with intermittent signal acquisition. |
| Programmable 50kHz–500kHz oscillator | Enables trade-off between output impedance (ROL), efficiency, and EMI; RT-to-GND yields fixed 500kHz for fastest transient response. |
| Integrated short-circuit and thermal protection | Eliminates need for external current-limiting or thermal monitoring circuits - improves BOM simplicity and reliability in harsh environments. |
| Low-noise constant-frequency inversion | Delivers clean –VIN output with predictable ripple (VRIPPLE ≈ IOUT / (COUT × fOSC)), supporting precision analog signal chains. |
| Wide 4.5V–32V input range | Directly interfaces with unregulated industrial supplies, automotive batteries (with transient clamping), and legacy 24V/28V systems. |
Applications
| Industrial Sensor Bias Supply | Portable Medical Instrumentation |
|---|---|
Use Scenario: Powering dual-rail op-amps and precision ADC drivers in handheld gas analyzers or ECG front-ends. IC Role / Device Role / Timing Role: Generates stable, low-noise –VIN rail from single 9V or 12V battery or Li-ion pack. Use Value: Enables rail-to-rail input/output swing and reduced offset drift without discrete DC/DC converters or transformers. |
Use Scenario: Providing isolated negative bias for photodiode transimpedance amplifiers and low-noise analog front-ends in battery-powered ultrasound probes. IC Role / Device Role / Timing Role: Inverting charge pump delivering ≤100mA at –5V to –15V with Burst Mode® for standby power savings. Use Value: Extends battery life beyond 100 hours per charge while maintaining fast wake-up and minimal output voltage droop. |
| Test & Measurement Equipment | Process Control Signal Conditioning |
Use Scenario: Generating matched ±15V rails for high-precision DACs and calibration references in benchtop multimeters and source-measure units. IC Role / Device Role / Timing Role: High-accuracy inverting charge pump operating in constant-frequency mode with 500kHz fOSC and low-ESR ceramic output capacitors. Use Value: Achieves <10mVpp ripple and <0.5% line/load regulation - meets Class A metrology-grade signal integrity requirements. |
Use Scenario: Biasing isolation amplifiers and 4–20mA loop drivers in hazardous-area PLC I/O modules powered from 24V DC field buses. IC Role / Device Role / Timing Role: Robust inverting supply with UVLO (3.4V), thermal shutdown, and short-circuit protection for continuous 24/7 operation. Use Value: Ensures uninterrupted analog signal conditioning even under brownout or overtemperature conditions common in factory-floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3260IMSE#TRPBF | Dual-output version with independent +VIN and –VIN rails; includes integrated LDOs (±50mA) for post-regulation; larger MSE-16 package. | Required when both positive and negative regulated rails are needed simultaneously - e.g., dual-supply op-amp stages with tight PSRR demands. | Select LTC3260 if system requires two independent, low-noise rails and board space allows larger footprint; LTC3261 remains optimal for single-rail inversion with minimal BOM count. |
| LT1054CN8#PBF | Legacy 8-pin SOIC; fixed 25kHz switching; no Burst Mode®; max 100mA but higher quiescent current (1.2mA); no RT programming or thermal shutdown. | Suitable only for cost-sensitive, non-battery, non-thermal-critical applications where 25kHz ripple is acceptable and UVLO/short-circuit protection is handled externally. | Choose LT1054 only for legacy redesigns with existing SOIC footprints and relaxed efficiency/thermal specs; LTC3261 offers superior integration, efficiency, and protection. |
Compared with LTC3260IMSE#TRPBF and LT1054CN8#PBF, the LTC3261EMSE#TRPBF provides the best balance of single-rail inversion efficiency, programmable frequency, ultra-low quiescent current, and comprehensive protection - making it the preferred choice for new industrial and portable designs requiring reliable, compact negative voltage generation.
Availability
LTC3261EMSE#TRPBF is available at Aetrix Electronics and suitable for industrial sensor bias supplies, portable medical instrumentation, test & measurement equipment, and process control signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3261EMSE#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 high-performance analog IC portfolio. Linear Technology was renowned for innovative power management, signal conditioning, and precision analog solutions targeting demanding industrial and instrumentation markets.
The LTC3261EMSE#TRPBF belongs to Linear's high-voltage charge pump family, engineered specifically for robust bipolar supply generation in environments where wide input range, low quiescent power, and integrated protection are essential - such as automated test equipment and portable diagnostic devices.
FAQ
What is the maximum input voltage the LTC3261EMSE#TRPBF can handle?
The LTC3261EMSE#TRPBF has an absolute maximum input voltage rating of 36V, with guaranteed operation across 4.5V to 32V. Operating continuously at 32V is supported per datasheet specifications, provided thermal design maintains junction temperature ≤125°C under full 100mA load. Exceeding 32V risks violating the specified operating range and may trigger undervoltage lockout or damage.
How does the MODE pin affect output voltage accuracy and ripple in the LTC3261EMSE#TRPBF?
In the LTC3261EMSE#TRPBF, MODE = HIGH enables Burst Mode® operation, regulating VOUT to –0.94·VIN with hysteretic control and 60µA quiescent current - resulting in higher output ripple (due to burst cycling) but superior light-load efficiency. MODE = LOW selects constant-frequency mode, delivering precisely –VIN with lower ripple (determined by fOSC and COUT), at the cost of higher quiescent current (3.5mA typ). Output accuracy depends on VIN tolerance and load-induced voltage drop across ROL.
Can the LTC3261EMSE#TRPBF drive a 100mA load continuously, and what thermal considerations apply?
Yes, the LTC3261EMSE#TRPBF is rated for continuous 100mA output current, but thermal design is critical. At VIN = 32V and VOUT = –32V, power dissipation reaches ~6.4W. With θJA = 40°C/W, this raises junction temperature by 256°C above ambient - exceeding safe limits. Real-world use requires derating: at 25°C ambient, max continuous power is ~1.5W (e.g., VIN = 15V, IOUT = 100mA). Proper PCB layout with the exposed pad soldered to a 2-layer ground plane is mandatory to achieve rated thermal performance.
What is the function of the RT pin in the LTC3261EMSE#TRPBF, and how is oscillator frequency calculated?
The RT pin in the LTC3261EMSE#TRPBF serves as the oscillator frequency programming input, regulated internally to 1.2V. A resistor (RRT) from RT to GND sets fOSC according to the empirical formula fOSC ≈ 106 / RRT (with RRT in ohms), yielding 50kHz at 20MΩ and 500kHz at 2MΩ. If RT is tied directly to GND, fOSC defaults to 500kHz. This direct resistor-based control enables precise optimization of output impedance and ripple without external clock sources.
Does the LTC3261EMSE#TRPBF require external components for basic operation, and which ones are mandatory?
Yes, the LTC3261EMSE#TRPBF requires four mandatory external components: (1) Input bypass capacitor (≥2µF ceramic) at VIN, (2) Flying capacitor (≥1µF ceramic) between C+ and C–, (3) Output capacitor (≥2µF ceramic) at VOUT, and (4) RT resistor (if programmable frequency is needed; GND suffices for 500kHz). Optional components include EN and MODE pull-up/down resistors for fixed-mode operation and additional bulk capacitance for high-current transients. No inductors or transformers are required.
LTC3261EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 32V
- Voltage - Output (Min/Fixed):
- -Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3261EMSE#TRPBF FAQ
1.How can I place an order for LTC3261EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3261EMSE#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 LTC3261EMSE#TRPBF reliable?
The price and inventory of LTC3261EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3261EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3261EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3261EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3261EMSE#TRPBF?
LTC3261EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3261EMSE#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 LTC3261EMSE#TRPBF?
For technical support, including LTC3261EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3261EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3261EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3261EMSE#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 LTC3261EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3261EMSE#TRPBF?
All LTC3261EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3261EMSE#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 LTC3261EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3261EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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