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Analog Devices Inc. LTC3261MPMSE#PBF
- Part No.:
- LTC3261MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3261MPMSE#PBF.pdf
- Description:
- IC REG CHARGE PUMP 100MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:438
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Product details
Overview
LTC3261MPMSE#PBF 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 requiring stable negative bias rails.
For engineers reviewing the LTC3261MPMSE#PBF datasheet, LTC3261MPMSE#PBF pinout, LTC3261MPMSE#PBF application, or LTC3261MPMSE#PBF 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 efficiency vs. noise trade-offs.
Technical Context
The LTC3261MPMSE#PBF implements a four-switch inverting charge pump topology with hysteretic Burst Mode® control and fixed-frequency oscillator. Its MODE pin selects between open-loop constant-frequency inversion (–VIN) and closed-loop Burst Mode regulation (–0.94·VIN), while RT pin sets oscillator frequency from 50kHz to 500kHz using an external resistor.
It integrates undervoltage lockout (3.4V rising), shutdown current of 2µA, internal pull-downs on MODE/EN pins, and thermal shutdown at ~175°C with automatic recovery at ~165°C. The exposed GND pad (Pin 13) is mandatory for thermal management and electrical reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 32V - supports wide industrial bus voltages including 24V DC systems without pre-regulation. |
| Output Current | Up to 100mA - sufficient for powering op-amp bias networks, ADC reference buffers, or sensor excitation circuits. |
| Burst Mode IQ | 60µA - enables multi-year battery life in always-on portable instrumentation with light loads. |
| Oscillator Frequency | 50kHz to 500kHz (RT-programmable) - allows EMI tuning and ripple/noise optimization per system requirements. |
| Operating Temp Range | –55°C to 150°C - qualified for extended-temperature industrial, aerospace, and downhole applications. |
| VOUT Regulation | –VIN (constant freq) or –0.94·VIN (Burst Mode) - provides precise negative rail tracking or efficiency-optimized regulation. |
| Short-Circuit Current Limit | 160mA (typical) - protects against sustained faults without external current-sense components. |
Pinout & Package
The LTC3261MPMSE#PBF is housed in a thermally enhanced 12-pin MSOP package (MSE12) with an exposed GND pad (Pin 13) that must be soldered to PCB ground for thermal and electrical integrity. Package dimensions: 3.00mm × 3.00mm × 0.889mm, 0.5mm pitch.
| 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 - no functional impact. |
| Pin 2 (RT) | Oscillator frequency programming | Resistor-to-GND sets fOSC; 0Ω = 500kHz default - critical for ripple/noise/efficiency tuning. |
| Pin 4 (VOUT) | Inverted output voltage node | Delivers regulated –VIN or –0.94·VIN depending on MODE state - connects directly to load capacitance. |
| Pin 5 (C–) | Flying capacitor negative terminal | High-dV/dt node; requires short, low-inductance routing to CFLY - impacts charge transfer efficiency. |
| Pin 8 (C+) | Flying capacitor positive terminal | Paired with C–; forms charge-transfer path - mismatched layout causes imbalance and ripple. |
| Pin 9 (VIN) | Main power input | 4.5V–32V supply; requires ≥2µF low-ESR ceramic bypass close to pin - prevents input instability. |
| Pin 10 (EN) | Enable logic input | Active-high; <1.0V = shutdown (2µA IQ), >1.1V = enabled - supports system-level power sequencing. |
| Pin 11 (MODE) | Operating mode select | High = Burst Mode (60µA IQ, higher ripple), Low = constant-frequency (low-noise, –VIN) - defines system power/noise priority. |
| Pin 13 (GND) | Ground reference & thermal pad | Exposed copper pad; must be soldered to solid PCB ground plane - reduces θJA to 40°C/W and prevents thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Extended temperature grade | –55°C to 150°C operating range - validated for mission-critical industrial and defense applications where standard commercial parts fail. |
| Dual-mode regulation | Selectable Burst Mode (60µA IQ) or constant-frequency (50kHz–500kHz) - enables dynamic trade-off between standby power and output noise. |
| Integrated protection | Short-circuit current limit (~160mA) and thermal shutdown (~175°C) - eliminates need for external fault-handling circuitry. |
| Low-noise constant-frequency mode | Fixed 500kHz (RT = GND) or programmable oscillator - simplifies EMI filtering and supports sensitive analog signal chains. |
| Thermally optimized package | 12-lead MSOP with exposed GND pad - achieves 40°C/W θJA with proper PCB layout, enabling 100mA operation at high ambient temperatures. |
Applications
| Portable Medical Instrumentation | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Powering precision analog front-ends in handheld ultrasound or ECG devices requiring clean ±15V rails from a single 12V Li-ion battery. IC Role / Device Role / Timing Role: Inverting charge pump generating stable –12V rail with Burst Mode® operation during standby to extend battery life. Use Value: 60µA quiescent current enables >5-year shelf life; –55°C to 150°C rating ensures reliability across clinical and field environments. | Use Scenario: Biasing high-impedance pH or strain-gauge sensors in factory-floor analyzers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Generating low-noise –VIN rail for op-amp input stages and ADC reference buffers in noisy industrial settings. Use Value: Constant-frequency mode minimizes switching noise coupling into µV-level sensor signals; thermal shutdown prevents failure during enclosure overheating. |
| Downhole Oil & Gas Monitoring | Avionics Power Management |
Use Scenario: Providing isolated negative bias for pressure transducers and telemetry modems in borehole tools operating at 150°C ambient. IC Role / Device Role / Timing Role: High-reliability inverting charge pump delivering –24V from 32V bus under extreme thermal stress. Use Value: Full –55°C to 150°C qualification and exposed-pad thermal design ensure continuous operation where standard ICs derate to zero output. | Use Scenario: Generating auxiliary –5V rail for flight-control interface ICs in UAVs and satellite subsystems with strict SWaP-C constraints. IC Role / Device Role / Timing Role: Compact, inductorless negative supply replacing bulky discrete solutions in space-constrained avionics enclosures. Use Value: 12-pin MSOP footprint saves >70% board area vs. inductor-based inverters; RT-programmable frequency avoids critical EMI bands. |
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#PBF | Dual-output (±VIN), includes LDO regulators on both rails; higher IQ (120µA Burst Mode); same 4.5V–32V input and 100mA per rail. | Required when both positive and negative regulated rails are needed simultaneously - e.g., dual-supply op-amps or RS-485 transceivers. | Choose LTC3260IMSE#PBF only if dual-rail generation is required; LTC3261MPMSE#PBF offers lower cost and simpler layout for single-negative-rail use cases. |
| LT3467EMSE#PBF | Inductor-based inverting regulator; higher efficiency (>85%) at >20mA loads; fixed 1.3MHz switching; requires external inductor and diode. | Suitable for high-current, high-efficiency applications where board space permits magnetics - e.g., motor driver bias supplies. | Choose LT3467EMSE#PBF when >20mA continuous load and >85% efficiency are mandatory; LTC3261MPMSE#PBF avoids inductors and EMI filters for compact, low-noise designs. |
Compared with LTC3260IMSE#PBF and LT3467EMSE#PBF, the LTC3261MPMSE#PBF uniquely balances ultra-low quiescent current (60µA), inductorless simplicity, and extended temperature operation - making it optimal for space-constrained, battery-powered, or thermally aggressive single-negative-rail applications where magnetic components or dual outputs are unnecessary.
Availability
LTC3261MPMSE#PBF is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial sensor signal conditioning, downhole monitoring, and avionics power management requiring stable component supply across extended temperature ranges.
Supply support for LTC3261MPMSE#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 of high-performance analog ICs for precision power, signal conditioning, and timing applications.
The LTC3261MPMSE#PBF belongs to Linear's high-voltage charge pump family, engineered specifically for robust bipolar supply generation in industrial, medical, and aerospace systems demanding extended temperature operation and low-noise performance.
FAQ
What is the maximum output current capability of the LTC3261MPMSE#PBF?
The LTC3261MPMSE#PBF delivers up to 100mA of continuous output current in constant-frequency mode. Output current is load- and temperature-dependent: at full 100mA and 32V input, thermal limits require careful PCB layout with the exposed GND pad fully soldered. Short-circuit current is internally limited to ~160mA, protecting the device during faults. The LTC3261MPMSE#PBF maintains this rating across its full –55°C to 150°C operating junction temperature range.
How does Burst Mode® operation affect output voltage accuracy and ripple in the LTC3261MPMSE#PBF?
In Burst Mode®, the LTC3261MPMSE#PBF regulates VOUT to –0.94·VIN (typical) using a hysteretic comparator, resulting in ±1.5% regulation accuracy over temperature and line. Output ripple increases significantly versus constant-frequency mode - typically 20–50mVP-P at light loads due to burst-cycle discontinuities. This trade-off enables 60µA quiescent current, ideal for standby operation. The LTC3261MPMSE#PBF datasheet provides ripple vs. load curves for both modes to guide capacitor selection.
Can the LTC3261MPMSE#PBF be used with input voltages below 4.5V?
No - the LTC3261MPMSE#PBF has a guaranteed minimum input voltage of 4.5V per its Absolute Maximum Ratings and Electrical Characteristics tables. Below 4.5V, undervoltage lockout (UVLO) activates at ~3.4V (rising), disabling operation. Attempting to operate near or below 4.5V risks erratic behavior, failure to start, or undefined regulation. For sub-4.5V inputs, consider alternatives like LTC1144 or LTC3252, but the LTC3261MPMSE#PBF is strictly specified for 4.5V–32V operation.
What is the role of the exposed pad (Pin 13) on the LTC3261MPMSE#PBF, and is it mandatory to connect?
The exposed pad (Pin 13) on the LTC3261MPMSE#PBF is electrically and thermally connected to GND and is mandatory for both functionality and reliability. It reduces thermal resistance (θJA = 40°C/W) and prevents thermal shutdown under load. Leaving it unconnected raises junction temperature by >30°C at 100mA, risking premature shutdown or long-term degradation. Per the datasheet, the pad "must be soldered to PCB ground plane" - not optional. The LTC3261MPMSE#PBF will not meet its rated specifications without proper pad connection.
How does the RT pin programming work on the LTC3261MPMSE#PBF, and what happens if it's left floating?
The RT pin on the LTC3261MPMSE#PBF sets oscillator frequency via a resistor to GND: 0Ω yields 500kHz, 200kΩ yields ~100kHz, and values up to 10MΩ scale down to 50kHz. If left floating, the RT pin is undefined - the internal 1.2V regulation fails, causing unpredictable frequency, potential startup failure, or excessive current draw. Always tie RT to GND (for 500kHz) or to a defined resistor. The LTC3261MPMSE#PBF datasheet Figure 1 provides exact RT vs. fOSC data for precision design.
LTC3261MPMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3261MPMSE#PBF FAQ
1.How can I place an order for LTC3261MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3261MPMSE#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 LTC3261MPMSE#PBF reliable?
The price and inventory of LTC3261MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3261MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3261MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3261MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3261MPMSE#PBF?
LTC3261MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3261MPMSE#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 LTC3261MPMSE#PBF?
For technical support, including LTC3261MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3261MPMSE#PBF requirements.
6.How does Aetrix verify that LTC3261MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3261MPMSE#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 LTC3261MPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3261MPMSE#PBF?
All LTC3261MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3261MPMSE#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 LTC3261MPMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3261MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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