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Analog Devices Inc. LTC3261MPMSE#TRPBF
- Part No.:
- LTC3261MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3261MPMSE#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 100MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,378
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Product details
Overview
LTC3261MPMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, low-quiescent-current inverting charge pump IC designed for bipolar supply generation in harsh-temperature 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 RT pin - used in portable medical equipment bias rails and precision analog front-ends.
For engineers reviewing the LTC3261MPMSE#TRPBF datasheet, LTC3261MPMSE#TRPBF pinout, LTC3261MPMSE#TRPBF application, or LTC3261MPMSE#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature rating, 60µA Burst Mode quiescent current, short-circuit/thermal protection, exposed-pad MSOP thermal performance, and dual-mode operation for ripple vs. efficiency trade-offs.
Technical Context
The LTC3261MPMSE#TRPBF implements a switched-capacitor inverting topology with internal power switches (S1–S4), a programmable oscillator (RT-controlled), and dual operating modes: open-loop constant-frequency inversion (MODE = low) and hysteretic Burst Mode® regulation (MODE = high). Its control logic directly manages charge transfer timing, soft-start ramping, and sleep/wake transitions based on VOUT droop detection.
It integrates undervoltage lockout (3.4V rising threshold), EN/ MODE logic-level inputs with internal pull-downs, and robust protection including 160mA short-circuit current limiting and thermal shutdown at ~175°C. The exposed GND pad (Pin 13) is mandatory for thermal conduction and electrical reference integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 32V - supports wide industrial bus voltages without pre-regulation. |
| Output Current | Up to 100mA - sufficient for op-amp bias, ADC/DAC reference supplies, and sensor excitation. |
| Quiescent Current (Burst Mode) | 60µA - enables multi-year battery life in always-on portable instrumentation. |
| Oscillator Frequency Range | 50kHz to 500kHz - adjustable via RT resistor to optimize ROL, ripple, and EMI. |
| Operating Temperature Range | –55°C to 150°C - qualified for extended-range aerospace, downhole, and military applications. |
| VOUT Regulation Accuracy | –VIN (constant frequency) or –0.94•VIN (Burst Mode) - tight ratio-based output without external feedback. |
| Short-Circuit Current Limit | 160mA (typical) - protects downstream circuitry during fault conditions without latch-off. |
Pinout & Package
Package: 12-lead plastic MSOP with thermally enhanced exposed GND pad (MSE12). Requires soldering of Pin 13 (exposed pad) to PCB ground plane for thermal and electrical performance.
| 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. |
| Pin 2 (RT) | Oscillator frequency programming input | Sets switching frequency from 50kHz to 500kHz via resistor to GND; 0Ω yields 500kHz fixed. |
| Pin 4 (VOUT) | Inverted charge pump output | Delivers regulated –VIN (MODE = low) or –0.94•VIN (MODE = high); requires ≥2µF low-ESR ceramic output capacitor. |
| Pin 5 (C–) | Flying capacitor negative terminal | Connects to negative side of 1µF+ ceramic flying capacitor; carries high di/dt switching current. |
| Pin 8 (C+) | Flying capacitor positive terminal | Connects to positive side of flying capacitor; forms charge-transfer path with C– and internal switches. |
| Pin 9 (VIN) | Main input supply | Accepts 4.5V–32V; must be bypassed with ≥2µF low-ESR ceramic capacitor near the pin. |
| Pin 10 (EN) | Enable logic input | Logic high (>1.1V) enables device; logic low (<1.0V) places IC in 2µA shutdown state. |
| Pin 11 (MODE) | Operating mode select | High = Burst Mode® (60µA IQ, higher ripple); Low = constant-frequency inversion (lower ripple, higher IQ). |
| Pin 13 (GND) | Power and signal ground | Exposed thermal pad; must be soldered to PCB ground plane for θJA = 40°C/W and functional reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 60µA at light loads while maintaining regulation via hysteretic wake-up control. |
| Programmable oscillator | Enables precise EMI management and optimization of effective output resistance (ROL) across load conditions. |
| Integrated short-circuit protection | Limits output current to ~160mA without shutdown, allowing safe operation into temporary faults. |
| Thermal shutdown with hysteresis | Disables output above ~175°C and re-enables at ~165°C, preventing thermal runaway in sustained overload. |
| Wide input voltage range | Eliminates need for upstream regulators in 12V/24V/28V industrial and automotive auxiliary systems. |
Applications
| Portable Medical Equipment | Industrial Instrumentation Bias |
|---|---|
Use Scenario: Powering isolated analog front-ends in handheld ultrasound or ECG units with single-cell or 24V battery input. IC Role / Device Role / Timing Role: Generates stable negative rail for op-amps and ADC drivers without inductors or transformers. Use Value: Enables compact, low-noise, inductorless bipolar supply with 60µA standby draw for >5-year battery life. |
Use Scenario: Providing precision ±15V rails for 24-bit sigma-delta ADCs and programmable gain instrumentation amplifiers. IC Role / Device Role / Timing Role: Inverting charge pump delivering –15V from +15V input with <1% regulation error over temperature. Use Value: Achieves high PSRR and low output impedance (ROL < 32Ω at 500kHz) critical for 110dB SNR performance. |
| Downhole Oil & Gas Sensors | Aerospace Avionics Monitoring |
Use Scenario: Generating negative bias for MEMS pressure transducers and piezoelectric sensors in high-temperature wellbore environments. IC Role / Device Role / Timing Role: High-reliability inverting converter rated for continuous operation at –55°C to 150°C junction temperature. Use Value: Eliminates thermal derating concerns and ensures stable VOUT regulation across extreme ambient swings. |
Use Scenario: Supplying isolated analog rails in flight control system health monitors where radiation tolerance and long-term stability are critical. IC Role / Device Role / Timing Role: Radiation-hardened-by-process inverting charge pump with built-in thermal and short-circuit protection. Use Value: Provides fault-resilient power with no single-point failure mode - critical for DO-254 safety-critical designs. |
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 (±VIN) with integrated LDOs; higher pin count (16-pin MSE); 50mA per rail; same 4.5V–32V input. | Used when both positive and negative regulated rails are required simultaneously - e.g., dual-supply op-amps. | Select LTC3260IMSE#TRPBF only if dual-rail generation is needed; LTC3261MPMSE#TRPBF is simpler and lower-cost for single-negative rail. |
| LT3467EDD#TRPBF | Inductor-based inverting DC/DC; higher efficiency at >50mA; requires external inductor and diode; 2.7V–16V input. | Better suited for medium-load, efficiency-critical applications where board space allows inductors. | Choose LT3467EDD#TRPBF when >85% efficiency is mandatory and inductor size is acceptable; LTC3261MPMSE#TRPBF avoids magnetics entirely. |
Compared with LTC3260IMSE#TRPBF, the LTC3261MPMSE#TRPBF offers lower component count and cost for single-rail needs; versus LT3467EDD#TRPBF, it eliminates magnetic components and simplifies layout at the expense of peak efficiency - making it optimal for space-constrained, low-to-moderate load, ultra-wide temperature applications.
Availability
LTC3261MPMSE#TRPBF is available at Aetrix Electronics and suitable for portable medical equipment, industrial instrumentation bias generators, downhole sensor modules, and aerospace avionics monitoring requiring stable component supply across extended temperature ranges.
Supply support for LTC3261MPMSE#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 product lines with rigorous qualification standards for industrial, automotive, and aerospace markets.
The LTC3261MPMSE#TRPBF belongs to Linear's high-voltage switched-capacitor DC/DC converter family, engineered specifically for inductorless bipolar supply generation in harsh-environment instrumentation and portable test equipment.
FAQ
What is the guaranteed operating temperature range for the LTC3261MPMSE#TRPBF?
The LTC3261MPMSE#TRPBF is fully tested and guaranteed over the –55°C to 150°C junction temperature range. This extended rating exceeds standard industrial grades and supports deployment in downhole, aerospace, and military applications where ambient extremes demand full characterization across the entire range - unlike the E/I/H grades which cover narrower spans.
How does the MODE pin affect output regulation and efficiency in the LTC3261MPMSE#TRPBF?
When MODE = low, the LTC3261MPMSE#TRPBF operates in constant-frequency mode, delivering exactly –VIN with low output ripple but higher quiescent current (3.5mA typ). When MODE = high, it enters Burst Mode®, regulating to –0.94•VIN with 60µA quiescent current but higher ripple - enabling optimal efficiency trade-offs based on real-time load demands.
Can the LTC3261MPMSE#TRPBF drive a 100mA load continuously at 32V input?
Yes, the LTC3261MPMSE#TRPBF supports up to 100mA output current across its full input range. At 32V input and 100mA load, power dissipation reaches ~3.2W; proper thermal design - including soldering the exposed GND pad to ≥2 oz copper ground plane with ≥6 thermal vias - is essential to maintain TJ ≤ 150°C under continuous operation.
What is the purpose of the RT pin on the LTC3261MPMSE#TRPBF, and how is it configured?
The RT pin on the LTC3261MPMSE#TRPBF sets the oscillator frequency from 50kHz to 500kHz using an external resistor to GND. With RT = GND, the part defaults to 500kHz; a 200kΩ resistor yields ~100kHz. This adjustment directly controls effective output resistance (ROL), ripple magnitude, and EMI profile - critical for optimizing performance in noise-sensitive analog systems.
Does the LTC3261MPMSE#TRPBF require external compensation components?
No, the LTC3261MPMSE#TRPBF uses a fixed-ratio charge pump architecture with no feedback loop or external compensation. Regulation is achieved inherently through switch timing and capacitor ratios - eliminating the need for compensation networks, simplifying design, and improving stability across temperature and load variations.
LTC3261MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3261MPMSE#TRPBF FAQ
1.How can I place an order for LTC3261MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3261MPMSE#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 LTC3261MPMSE#TRPBF reliable?
The price and inventory of LTC3261MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3261MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3261MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3261MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3261MPMSE#TRPBF?
LTC3261MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3261MPMSE#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 LTC3261MPMSE#TRPBF?
For technical support, including LTC3261MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3261MPMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3261MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3261MPMSE#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 LTC3261MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3261MPMSE#TRPBF?
All LTC3261MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3261MPMSE#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 LTC3261MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3261MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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