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Analog Devices Inc. LTC3261IMSE#TRPBF
- Part No.:
- LTC3261IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3261IMSE#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 100MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,865
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Product details
Overview
LTC3261IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage inverting charge pump IC designed for bipolar supply generation in industrial and portable instrumentation. 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.
For engineers reviewing the LTC3261IMSE#TRPBF datasheet, LTC3261IMSE#TRPBF pinout, LTC3261IMSE#TRPBF application, or LTC3261IMSE#TRPBF equivalent, key selection criteria include input voltage range compatibility, quiescent current trade-off between Burst vs constant-frequency modes, thermal management of the exposed-pad MSOP package, and verification of flying capacitor sizing for target load and ripple requirements.
Technical Context
The LTC3261IMSE#TRPBF implements a four-switch inverting charge pump topology with internal logic-controlled phase sequencing. Its dual-mode operation is determined solely by the MODE pin: low enables open-loop constant-frequency inversion (–VIN), while high activates hysteretic Burst Mode regulation (–0.94·VIN) with 60µA quiescent current.
Switching frequency is set externally via RT-to-GND resistor (50kHz–500kHz); grounding RT fixes fOSC at 500kHz. Internal short-circuit protection limits IOUT to ~160mA, and thermal shutdown disables output above ~175°C junction temperature, resuming at ~165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 32V - supports wide industrial input rails including 24V systems and battery-powered 9–32V instruments. |
| Output Current | Up to 100mA - sufficient for op-amp bias, ADC reference, and sensor excitation in portable instrumentation. |
| Quiescent Current (Burst) | 60µA - enables multi-day battery life in low-duty-cycle portable medical devices. |
| Regulation Accuracy | –0.94·VIN (Burst), –VIN (Constant Freq) - defines output tracking precision for symmetric rail generation. |
| Oscillator Frequency | 50kHz to 500kHz (RT-programmable) - higher frequencies reduce effective output resistance and improve transient response. |
| Thermal Protection | Active above ~175°C junction - prevents permanent damage during overload or poor PCB thermal design. |
| Package | 12-pin MSOP with exposed GND pad - requires soldered thermal connection to PCB ground plane for θJA = 40°C/W. |
Pinout & Package
The LTC3261IMSE#TRPBF is housed in a thermally enhanced 12-pin MSOP package (MSE12) with an exposed GND pad (Pin 13) that must be soldered to the PCB ground plane for functional and thermal performance compliance.
| 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 electrical function. |
| Pin 2 (RT) | Frequency programming input | Sets oscillator frequency from 50kHz–500kHz via external resistor to GND; grounded = 500kHz fixed. |
| Pin 4 (VOUT) | Inverted output voltage node | Delivers regulated –VIN (MODE = L) or –0.94·VIN (MODE = H); 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 power input | Accepts 4.5V–32V supply; requires ≥2µF low-ESR ceramic bypass capacitor close to pin. |
| Pin 10 (EN) | Enable control input | Logic high enables operation; logic low places device in shutdown (2µA IIN). |
| Pin 11 (MODE) | Operating mode select | High = Burst Mode (60µA IQ, –0.94·VIN); Low = Constant frequency (–VIN, lower ripple). |
| Pin 13 (GND) | Power and signal ground | Exposed thermal pad - must be soldered to PCB ground plane for thermal integrity and electrical reference. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 4.5V to 32V - eliminates need for pre-regulation in 24V industrial or multi-cell battery systems. |
| Dual-mode regulation | Selectable Burst Mode (60µA IQ) or constant-frequency (low-noise –VIN) via single MODE pin - optimizes efficiency vs. noise for varying load profiles. |
| Programmable switching frequency | 50kHz–500kHz via RT resistor - allows trade-off between output impedance, capacitor size, and EMI profile. |
| Integrated protection | Short-circuit current limit (~160mA) and thermal shutdown (>175°C) - enables robust operation without external fault management circuitry. |
| Thermally enhanced package | 12-pin MSOP with exposed GND pad - achieves θJA = 40°C/W with proper PCB copper layout, supporting 100mA continuous output. |
Applications
| Portable Medical Instrumentation | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Powering dual-rail op-amps and precision ADCs in handheld ECG or blood glucose meters operating from single Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Generates stable negative rail (–VIN or –0.94·VIN) from main battery to enable bipolar analog front-end operation. Use Value: 60µA Burst Mode quiescent current extends battery life; wide VIN range accommodates battery discharge down to 4.5V. | Use Scenario: Providing isolated negative bias for strain gauge bridges, RTD excitation, or 4–20mA loop transmitters in factory-floor sensors. IC Role / Device Role / Timing Role: Inverting charge pump delivering –15V or –24V from 24V system rail to establish clean, low-noise analog reference. Use Value: 100mA output supports multiple sensor channels; constant-frequency mode minimizes noise coupling into sensitive measurements. |
| Portable Test & Measurement Equipment | Bipolar Supply for Precision DACs |
Use Scenario: Generating matched ±15V rails in handheld oscilloscope front-ends or portable DMMs using a single 24V input. IC Role / Device Role / Timing Role: High-voltage inverting charge pump configured as primary negative rail generator, paired with linear regulator for positive rail. Use Value: 32V max input enables direct use of unregulated 24V supplies; programmable fOSC allows EMI tuning in compact enclosures. | Use Scenario: Biasing high-resolution DACs (e.g., 16–24-bit) requiring ultra-low-noise, tightly regulated dual supplies in automated test equipment. IC Role / Device Role / Timing Role: Delivers low-ripple –VIN output in constant-frequency mode to minimize DAC output spectral noise. Use Value: Fixed 500kHz operation (RT = GND) reduces effective output resistance, improving load regulation and transient recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3260IDE#TRPBF | Dual-output version (±VIN) in 16-pin DFN; includes dual LDOs (±1.2V–32V, 50mA each); higher pin count and cost. | Required when both positive and negative regulated rails are needed simultaneously - e.g., dual-supply op-amp stages with independent LDO filtering. | Select LTC3260 if system needs integrated dual LDO post-regulation; LTC3261 remains optimal for single-rail inversion with minimal BOM. |
| LT3467EDD#TRPBF | Inductor-based inverting DC/DC; VIN 2.7V–16V; VOUT = –1.25V to –34V; 150mA; 1.4MHz; requires external inductor and diode. | Better suited for ultra-low-noise, high-PSRR applications where inductor filtering is acceptable - e.g., RF bias or ultra-low-noise audio. | Choose LT3467 for higher efficiency at light loads or tighter output voltage tolerance; LTC3261 preferred for capacitor-only solution and wider VIN. |
Compared with LTC3260IDE#TRPBF and LT3467EDD#TRPBF, the LTC3261IMSE#TRPBF offers the simplest capacitor-only implementation for single negative rail generation across the widest input range (4.5V–32V), with lowest component count and smallest footprint - ideal for space-constrained portable instrumentation where inductors are undesirable.
Availability
LTC3261IMSE#TRPBF is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial sensor signal conditioning, and portable test & measurement equipment requiring stable component supply, long-lifecycle support, and guaranteed temperature-grade consistency.
Supply support for LTC3261IMSE#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 full product support, documentation, and manufacturing continuity for all Linear parts including the LTC series.
The LTC3261IMSE#TRPBF belongs to Linear's high-voltage charge pump family, engineered specifically for bipolar supply generation in portable and industrial instrumentation where wide input range, low quiescent current, and capacitor-only design are critical.
FAQ
What is the maximum input voltage rating for the LTC3261IMSE#TRPBF?
The LTC3261IMSE#TRPBF has an absolute maximum input voltage (VIN) rating of 36V, with recommended continuous operation up to 32V. Exceeding 36V risks permanent damage per Absolute Maximum Ratings. The device is specified to deliver full 100mA output across its operational 4.5V–32V input range, making it suitable for 24V industrial systems and multi-cell battery inputs.
How does Burst Mode operation affect output voltage accuracy in the LTC3261IMSE#TRPBF?
In Burst Mode (MODE = high), the LTC3261IMSE#TRPBF regulates VOUT to –0.94·VIN with typical accuracy, not –VIN. This intentional 6% loss improves light-load efficiency by reducing switching activity. Output voltage deviation increases slightly under load due to effective output resistance; for precise –VIN tracking, constant-frequency mode (MODE = low) must be used.
Can the LTC3261IMSE#TRPBF generate –24V from a 24V input?
Yes - the LTC3261IMSE#TRPBF can generate approximately –24V from a 24V input in constant-frequency mode (MODE = low), or –22.6V in Burst Mode (MODE = high). Verified in Typical Application TA03 (24V to –24V Inverter) and supported by the –VIN and –0.94·VIN regulation specifications across the full 4.5V–32V input range.
What is the purpose of the exposed pad (Pin 13) on the LTC3261IMSE#TRPBF package?
The exposed pad (Pin 13) on the LTC3261IMSE#TRPBF is electrically and thermally connected to GND. It must be soldered to the PCB ground plane to ensure proper thermal dissipation (θJA = 40°C/W) and functional stability. Leaving it unconnected degrades thermal performance and may cause premature thermal shutdown under 100mA load conditions.
Is an external flying capacitor required for the LTC3261IMSE#TRPBF, and what value is recommended?
Yes - the LTC3261IMSE#TRPBF requires an external flying capacitor between C+ (Pin 8) and C– (Pin 5). A minimum 1µF X5R/X7R ceramic capacitor is recommended for full 100mA output capability. Smaller values (e.g., 0.2µF) may suffice for ≤20mA loads but increase effective output resistance and reduce available current.
Does the LTC3261IMSE#TRPBF provide short-circuit protection, and how does it behave during fault conditions?
Yes - the LTC3261IMSE#TRPBF includes internal short-circuit current limiting that caps output current at ~160mA (typical) when VOUT is shorted to GND. During sustained short-circuit, the device remains operational but dissipates significant power; thermal shutdown activates above ~175°C junction temperature, disabling output until temperature falls to ~165°C, then automatically recovers.
LTC3261IMSE#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
LTC3261IMSE#TRPBF FAQ
1.How can I place an order for LTC3261IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3261IMSE#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 LTC3261IMSE#TRPBF reliable?
The price and inventory of LTC3261IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3261IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3261IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3261IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3261IMSE#TRPBF?
LTC3261IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3261IMSE#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 LTC3261IMSE#TRPBF?
For technical support, including LTC3261IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3261IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3261IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3261IMSE#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 LTC3261IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3261IMSE#TRPBF?
All LTC3261IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3261IMSE#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 LTC3261IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3261IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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