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Analog Devices Inc. LTC3261IMSE#PBF
- Part No.:
- LTC3261IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3261IMSE#PBF.pdf
- Description:
- IC REG CHARGE PUMP 100MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,415
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Product details
Overview
LTC3261IMSE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage 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 - used in portable medical equipment bias rails.
For engineers reviewing the LTC3261IMSE#PBF datasheet, LTC3261IMSE#PBF pinout, LTC3261IMSE#PBF application, or LTC3261IMSE#PBF equivalent, key selection criteria include input voltage range (4.5V–32V), quiescent current (60µA in Burst Mode), short-circuit/thermal protection, MSOP-12 package with exposed GND pad, and dual-mode operation (Burst vs constant-frequency).
Technical Context
The LTC3261IMSE#PBF implements a four-switch inverting charge pump topology with internal logic-controlled S1–S4 switching sequence. Its operation is governed by two independent control inputs: EN enables/disables the entire circuit, while MODE selects between open-loop constant-frequency inversion (MODE = low) or hysteretic Burst Mode regulation (MODE = high).
Frequency programming is achieved via RT pin servoing to 1.2V with an external resistor to GND, setting oscillator frequency from 50kHz to 500kHz. The device integrates soft-start, undervoltage lockout (3.4V rising), and thermal shutdown (~175°C trip, ~165°C recovery), with short-circuit current limiting at 160mA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 32V - supports wide industrial power rails including 24V systems and battery-powered instruments. |
| Output Current | Up to 100mA - sufficient for op-amp biasing, ADC/DAC reference supplies, and sensor excitation in portable instrumentation. |
| Quiescent Current | 60µA in Burst Mode - enables multi-day battery life in low-duty-cycle portable medical devices. |
| Oscillator Frequency | 50kHz to 500kHz (RT-programmable) - allows trade-off between efficiency, ripple, and EMI in noise-sensitive analog signal chains. |
| Output Regulation | –VIN (constant-frequency) or –0.94·VIN (Burst Mode) - provides precise negative rail tracking or ultra-low-power operation depending on load profile. |
| Protection Features | Short-circuit current limit (160mA typ) and thermal shutdown (~175°C) - ensures robustness during fault conditions without external circuitry. |
| Operating Temp Range | –40°C to +125°C junction - qualified for industrial environments including factory automation and field-deployed test equipment. |
Pinout & Package
The LTC3261IMSE#PBF 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 thermal performance and functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC (Pins 1, 3, 6, 7, 12) | No-connect terminals | Internally unconnected; may be left floating or tied to GND - no electrical function or timing impact. |
| RT (Pin 2) | Frequency programming input | Serves to 1.2V; resistor to GND sets oscillator frequency from 50kHz to 500kHz - determines charge pump strength and ripple. |
| VOUT (Pin 4) | Inverted output voltage node | Delivers regulated –VIN (MODE = low) or –0.94·VIN (MODE = high); requires ≥2µF low-ESR ceramic output capacitor. |
| C– (Pin 5) | Flying capacitor negative terminal | Connects to negative side of 1µF+ ceramic flying capacitor - critical path for charge transfer; sensitive to layout parasitics. |
| C+ (Pin 8) | Flying capacitor positive terminal | Connects to positive side of flying capacitor - forms charge-transfer loop with C–; high di/dt node requiring short traces. |
| VIN (Pin 9) | Main power input | Accepts 4.5V–32V supply; requires ≥2µF low-ESR ceramic bypass capacitor close to pin to suppress input ripple. |
| EN (Pin 10) | Enable logic input | Logic high (>1.1V) enables operation; logic low (<1.0V) places device in shutdown drawing only 2µA. |
| MODE (Pin 11) | Operating mode select | Logic high enables Burst Mode (60µA IQ, higher ripple); logic low enables constant-frequency inversion (lower ripple, higher IQ). |
| GND (Pin 13, Exposed Pad) | Power and signal ground reference | Primary thermal path and circuit return; must be soldered to large PCB ground plane using multiple vias for θJA = 40°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode operation | Reduces quiescent current to 60µA while regulating VOUT to –0.94·VIN - extends battery life in intermittent-use portable instruments. |
| Programmable oscillator | 50kHz–500kHz frequency set by single RT-to-GND resistor - enables optimization of efficiency, output impedance, and EMI profile. |
| Integrated protection | Automatic short-circuit current limiting (160mA typ) and thermal shutdown (~175°C) - eliminates need for external fault management circuitry. |
| Soft-start circuitry | Internal ramp limits inrush current during startup - prevents input voltage droop and avoids false triggering of upstream UVLO circuits. |
| Wide input range | 4.5V to 32V operation - accommodates 12V/24V industrial rails, Li-ion stacks, and unregulated adapter outputs without pre-regulation. |
Applications
| Industrial Instrumentation Bias | Portable Medical Equipment |
|---|---|
Use Scenario: Generating dual ±15V rails for precision op-amps and analog front-ends in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Inverting charge pump providing stable –15V rail from 15V input; MODE pin controlled by system microcontroller for dynamic power-state management. Use Value: Eliminates need for inductor-based converters - reduces board area, EMI, and cost while meeting 100mA load requirement with <10mVpp ripple at 500kHz. | Use Scenario: Supplying negative bias for ECG amplifier stages and sensor interfaces in battery-powered patient monitors. IC Role / Device Role / Timing Role: Low-quiescent-current charge pump delivering –5V rail from 9V alkaline stack; operated in Burst Mode during standby to minimize average current draw. Use Value: Achieves 60µA IQ enabling >100-hour battery life in sleep mode while maintaining fast wake-up response (<1ms) due to integrated soft-start. |
| High-Voltage Industrial Sensors | Test & Measurement Equipment |
Use Scenario: Powering isolated signal conditioning circuits for 24V industrial current-loop transmitters (4–20mA) requiring negative supply headroom. IC Role / Device Role / Timing Role: Inverting converter generating –24V rail from 24V bus; RT resistor set to 200kΩ for 200kHz operation to balance efficiency and ripple in noisy factory environments. Use Value: Withstands 32V absolute max input and includes built-in short-circuit protection - survives transient overvoltages common on industrial buses. | Use Scenario: Creating clean negative supply for high-resolution ADC references and DAC output buffers in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Constant-frequency charge pump operating at 500kHz with low-ESR ceramic capacitors to minimize output ripple (<5mVpp) across full 100mA load range. Use Value: Delivers –12V rail with effective open-loop resistance <32Ω - maintains <120mV voltage drop at full load, preserving reference accuracy. |
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 version (±VIN) with integrated LDOs; higher pin count (16-pin MSE); 50mA per rail; wider VIN range (4.5V–32V). | Required when both positive and negative regulated rails are needed simultaneously - e.g., dual-supply op-amps or fully differential ADC drivers. | Select LTC3260IMSE#PBF only if dual-rail generation and LDO post-regulation are required; not a drop-in replacement due to different pinout and functionality. |
| LT3467EMSE#PBF | Inductor-based inverting DC/DC; higher efficiency at >50mA loads; fixed 1.2MHz switching; requires external inductor and diode; IQ = 1.1mA. | Better suited for continuous high-current loads where efficiency >85% is critical and board space permits inductor placement. | Choose LT3467EMSE#PBF when efficiency outweighs size/EMI concerns; avoid for ultra-low-IQ or inductor-free designs. |
Compared with LTC3260IMSE#PBF, the LTC3261IMSE#PBF offers single-rail simplicity and lower component count; versus LT3467EMSE#PBF, it eliminates magnetics and reduces EMI but trades off peak efficiency - making LTC3261IMSE#PBF optimal for compact, low-noise, moderate-current inverting supplies.
Availability
LTC3261IMSE#PBF is available at Aetrix Electronics and suitable for industrial instrumentation bias generators, portable medical equipment power rails, high-voltage sensor interfaces, and test & measurement equipment requiring stable component supply across extended temperature ranges.
Supply support for LTC3261IMSE#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 continues its legacy of high-performance analog ICs. Linear Technology was founded in 1981 and specialized in precision power management, signal conditioning, and RF solutions.
The LTC3261IMSE#PBF belongs to Linear's high-voltage charge pump product line, engineered specifically for bipolar supply generation in noise-sensitive, space-constrained industrial and medical applications where inductors are undesirable.
FAQ
What is the maximum input voltage rating for the LTC3261IMSE#PBF?
The LTC3261IMSE#PBF has an absolute maximum input voltage rating of 36V on the VIN pin. Its specified operating input range is 4.5V to 32V. Operation above 32V is outside guaranteed specifications and may compromise long-term reliability or trigger undervoltage lockout behavior.
How does the MODE pin affect output regulation in the LTC3261IMSE#PBF?
When MODE is pulled low (≤1.0V), the LTC3261IMSE#PBF operates in constant-frequency mode and regulates VOUT to –VIN. When MODE is pulled high (≥1.1V), it enters Burst Mode and regulates VOUT to –0.94·VIN with 60µA quiescent current. The MODE pin directly selects between these two distinct regulation schemes.
Can the LTC3261IMSE#PBF drive a 100mA load continuously in Burst Mode?
No - the LTC3261IMSE#PBF is rated for up to 100mA output current only in constant-frequency mode. In Burst Mode, sustained 100mA loading causes excessive voltage droop beyond the –0.94·VIN regulation band, forcing continuous burst cycling and increasing average quiescent current well above 60µA. For full 100mA capability, MODE must be held low.
What is the purpose of the exposed pad (Pin 13) on the LTC3261IMSE#PBF package?
The exposed pad (Pin 13) on the LTC3261IMSE#PBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane using multiple thermal vias to achieve the specified θJA of 40°C/W and ensure proper thermal performance and functional stability under full-load conditions.
Is the LTC3261IMSE#PBF RoHS-compliant and lead-free?
Yes, the LTC3261IMSE#PBF is RoHS-compliant and features a lead-free finish, as indicated by the "#PBF" suffix in the part number. This designation confirms compliance with EU Directive 2011/65/EU and meets IPC/JEDEC J-STD-609 moisture sensitivity level 1 requirements.
LTC3261IMSE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3261IMSE#PBF FAQ
1.How can I place an order for LTC3261IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3261IMSE#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 LTC3261IMSE#PBF reliable?
The price and inventory of LTC3261IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3261IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3261IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3261IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3261IMSE#PBF?
LTC3261IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3261IMSE#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 LTC3261IMSE#PBF?
For technical support, including LTC3261IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3261IMSE#PBF requirements.
6.How does Aetrix verify that LTC3261IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3261IMSE#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 LTC3261IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3261IMSE#PBF?
All LTC3261IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3261IMSE#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 LTC3261IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3261IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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