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Analog Devices Inc. LTC3261HMSE#PBF
- Part No.:
- LTC3261HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3261HMSE#PBF.pdf
- Description:
- IC REG CHARGE PUMP 100MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,597
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Product details
Overview
LTC3261HMSE#PBF 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 RT pin. It is used in portable medical equipment requiring stable negative bias rails.
For engineers reviewing the LTC3261HMSE#PBF datasheet, LTC3261HMSE#PBF pinout, LTC3261HMSE#PBF application, or LTC3261HMSE#PBF equivalent, key selection criteria include guaranteed –40°C to 150°C junction temperature operation, 60µA quiescent current in Burst Mode®, short-circuit/thermal protection, exposed-pad MSOP thermal performance, and precise MODE/RT pin control of regulation behavior and noise trade-offs.
Technical Context
The LTC3261HMSE#PBF implements a four-switch flying-capacitor topology with internal logic controlling S1–S4 to invert VIN across C+ and C–. Its dual-mode operation-Burst Mode® (hysteretic regulation at –0.94·VIN, 60µA IQ) and constant-frequency mode (open-loop inversion at –VIN, 50kHz–500kHz fOSC)-is selected via the MODE pin voltage threshold (0.4V–1.0V falling, 1.1V–2.0V rising).
Switching frequency is set by an external resistor from RT to GND, which servos to 1.2V when EN is high; RT = GND yields fixed 500kHz. The exposed pad (Pin 13) is electrically GND and thermally critical-θJA = 40°C/W requires soldering to PCB ground plane for rated 150°C max junction temperature compliance.
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 instruments. |
| Output Regulation | –VIN (constant-frequency mode) or –0.94·VIN (Burst Mode®) - enables precise negative rail generation with selectable ripple/noise trade-off. |
| Max Output Current | 100mA - sufficient for op-amp biasing, ADC reference supplies, and sensor excitation in portable instrumentation. |
| Quiescent Current | 60µA in Burst Mode® - extends battery life in low-duty-cycle portable medical devices without sacrificing regulation accuracy. |
| Oscillator Frequency | 50kHz to 500kHz, programmable via RT resistor - allows EMI optimization and capacitor size reduction while maintaining charge pump strength. |
| Junction Temp Range | –40°C to 150°C - qualified for harsh environments including industrial control cabinets and automotive under-hood auxiliary circuits. |
| Short-Circuit Current Limit | 160mA typical - protects downstream circuitry during fault conditions without external current-sense components. |
| Thermal Shutdown | Activates at ~175°C, resumes at ~165°C - provides robust overtemperature protection while allowing recovery after transient overload. |
Pinout & Package
The LTC3261HMSE#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 and electrical integrity.
| 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-no electrical function. |
| Pin 2 (RT) | Oscillator frequency programming input | Servos to 1.2V when enabled; sets fOSC from 50kHz–500kHz via external resistor to GND-critical for ripple/noise/efficiency tuning. |
| Pin 4 (VOUT) | Inverted charge pump output | Delivers regulated –VIN (MODE = L) or –0.94·VIN (MODE = H); requires ≥2µF low-ESR ceramic output capacitor for stable regulation. |
| Pin 5 (C–) | Flying capacitor negative terminal | High dv/dt node; connects to negative side of 1µF+ ceramic flying capacitor-must be routed short and away from noise-sensitive pins like RT. |
| Pin 8 (C+) | Flying capacitor positive terminal | High dv/dt node; connects to positive side of flying capacitor-forms charge transfer path with C– and internal switches S1–S4. |
| Pin 9 (VIN) | Main power input | Accepts 4.5V–32V; requires ≥2µF low-ESR ceramic bypass capacitor close to pin to suppress input ripple and support peak current demands. |
| Pin 10 (EN) | Enable logic input | Active-high enable; pulls down internally-driving low disables all circuitry except bias, reducing IQ to 2µA for shutdown mode. |
| Pin 11 (MODE) | Operating mode select | Logic high selects Burst Mode® (low IQ, higher ripple); logic low selects constant-frequency inversion (lower ripple, higher IQ). |
| Pin 13 (GND) | Ground and thermal pad | Exposed copper pad; electrically GND and thermally essential-must be soldered to large PCB ground plane to achieve θJA = 40°C/W and 150°C rating. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 60µA while maintaining ±1% regulation at –0.94·VIN-ideal for battery-powered portable instruments with intermittent load demand. |
| Programmable 50kHz–500kHz oscillator | Enables EMI filtering and capacitor optimization: lower frequencies reduce switching loss but increase ROL; higher frequencies improve transient response and reduce required COUT. |
| Integrated short-circuit and thermal protection | Automatically limits output current to ~160mA and disables output above ~175°C-eliminates need for external fault management circuitry in safety-critical medical designs. |
| Exposed-pad MSOP thermal design | θJA = 40°C/W achievable with proper PCB layout-supports continuous 100mA operation at 125°C ambient when using two-layer 2oz Cu ground plane with six vias under the pad. |
| Wide 4.5V–32V input range | Accepts unregulated industrial rails (e.g., 24V PLC outputs) and extended battery voltages (e.g., 3S Li-ion), simplifying front-end power architecture. |
Applications
| Portable Medical Instrumentation | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Handheld ECG or blood glucose meters requiring isolated, low-noise negative supply for precision analog front-ends. IC Role / Device Role / Timing Role: Inverting charge pump generating stable –5V or –12V bias rail from single-cell or 24V input, with Burst Mode® enabling multi-week battery life. Use Value: 60µA quiescent current in Burst Mode® extends battery runtime; 100mA output supports simultaneous op-amp, ADC, and display biasing without external regulators. |
Use Scenario: 4–20mA loop-powered transmitters and industrial pressure/temperature sensors needing bipolar supplies for rail-to-rail signal conditioning. IC Role / Device Role / Timing Role: High-voltage inverter converting 24V loop supply into –24V rail for op-amp input stages and DAC references in harsh factory environments. Use Value: 32V absolute max input withstands load-dump transients; –40°C to 150°C rating ensures reliability in uncontrolled cabinet temperatures. |
| Portable Test & Measurement Equipment | Bipolar Bias Generation for Precision ADCs |
|
Use Scenario: Battery-operated oscilloscope probes or handheld multimeters requiring clean, low-ripple negative supply for active probe amplifiers. IC Role / Device Role / Timing Role: Constant-frequency mode (MODE = L) delivering –VIN with <10mVpp ripple at 500kHz, minimizing measurement noise floor in sensitive analog paths. Use Value: Programmable fOSC allows ripple vs. efficiency tuning; 12-pin MSOP fits compact PCB layouts while exposed pad maintains thermal headroom during burst measurements. |
Use Scenario: High-resolution data acquisition systems (e.g., 24-bit delta-sigma ADCs) needing matched ±VREF rails for differential input stages and reference buffers. IC Role / Device Role / Timing Role: Dual-rail generator where LTC3261HMSE#PBF creates –VREF while a separate LDO or DC/DC generates +VREF, ensuring tight tracking and low PSRR. Use Value: –0.94·VIN regulation accuracy (±1%) and low output impedance (<32Ω) minimize reference drift and maintain SNR >110dB in precision metrology applications. |
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; no Burst Mode®; fixed 500kHz only. | Used when both positive and negative rails are needed simultaneously (e.g., dual-supply op-amps), not for single-rail inversion. | Select LTC3260IMSE#PBF only if dual-rail generation and LDO post-regulation are required-LTC3261HMSE#PBF is simpler and more efficient for single-rail inversion. |
| LT1054CN8#PBF | Legacy 8-pin SOIC; 3.5V–15V input; 100mA output; no programmable frequency; no Burst Mode®; higher 120µA IQ; no thermal pad. | Suitable for cost-sensitive, non-extended-temp consumer applications where 32V input and 150°C rating are unnecessary. | Choose LT1054CN8#PBF only for legacy replacements in benign environments-LTC3261HMSE#PBF offers superior voltage range, thermal performance, and power efficiency. |
Compared with LTC3260IMSE#PBF, the LTC3261HMSE#PBF delivers higher single-rail current (100mA vs. 50mA), lower quiescent current (60µA vs. 120µA), and wider input range (4.5–32V vs. 4.5–15V), making it optimal for high-voltage portable instrumentation. Versus LT1054CN8#PBF, it adds Burst Mode®, thermal protection, and MSOP thermal performance-critical for modern industrial and medical designs.
Availability
LTC3261HMSE#PBF is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial sensor signal conditioning, portable test equipment, and precision ADC bias generation requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3261HMSE#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 high-performance analog IC portfolio, emphasizing precision, reliability, and ruggedness for demanding industrial, medical, and aerospace applications.
The LTC3261HMSE#PBF belongs to Linear's high-voltage charge pump family, engineered specifically for bipolar supply generation in portable and harsh-environment instrumentation where wide input range, low IQ, and thermal resilience are mandatory.
FAQ
What is the maximum junction temperature specification for the LTC3261HMSE#PBF?
The LTC3261HMSE#PBF is guaranteed over a junction temperature range of –40°C to 150°C, distinguishing it from commercial-grade variants (e.g., LTC3261EMSE#PBF, rated to 125°C). This rating is validated per Note 2 in the datasheet and requires proper thermal design-including soldering the exposed pad (Pin 13) to a PCB ground plane-to maintain θJA ≤ 40°C/W.
How does the MODE pin affect regulation accuracy and output ripple in the LTC3261HMSE#PBF?
In the LTC3261HMSE#PBF, a logic high on MODE enables Burst Mode® operation, regulating VOUT to –0.94·VIN with ±1% accuracy but higher output ripple due to hysteretic control and sleep/wake cycles. A logic low selects constant-frequency mode, delivering –VIN with lower ripple (e.g., <10mVpp at 500kHz) but higher quiescent current (~3.5mA), making it preferable for noise-sensitive signal chains.
Can the LTC3261HMSE#PBF operate with input voltages below 4.5V?
No-the LTC3261HMSE#PBF has a specified minimum input voltage of 4.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Below this, undervoltage lockout (UVLO) prevents operation; VUVLO rising threshold is 3.6V typical, but functional regulation is not guaranteed below 4.5V. For sub-4.5V applications, consider alternatives like LTC1144 or LTC3250.
What is the role of the exposed pad (Pin 13) in the LTC3261HMSE#PBF package?
The exposed pad (Pin 13) of the LTC3261HMSE#PBF is electrically connected to GND and serves as the primary thermal path. It must be soldered to a PCB ground plane with at least six thermal vias to achieve the specified θJA = 40°C/W. Failure to do so risks exceeding the 150°C junction limit under load, triggering thermal shutdown and compromising reliability in continuous operation.
Does the LTC3261HMSE#PBF require external components for basic operation?
Yes-the LTC3261HMSE#PBF requires at minimum: one 1µF ceramic flying capacitor between C+ and C–, one ≥2µF ceramic input capacitor at VIN, and one ≥2µF ceramic output capacitor at VOUT. An external resistor from RT to GND sets switching frequency; EN and MODE pins need pull-up/down resistors for defined logic states. No inductors are needed-true inductorless charge pump operation.
LTC3261HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3261HMSE#PBF FAQ
1.How can I place an order for LTC3261HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3261HMSE#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 LTC3261HMSE#PBF reliable?
The price and inventory of LTC3261HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3261HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3261HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3261HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3261HMSE#PBF?
LTC3261HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3261HMSE#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 LTC3261HMSE#PBF?
For technical support, including LTC3261HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3261HMSE#PBF requirements.
6.How does Aetrix verify that LTC3261HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3261HMSE#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 LTC3261HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3261HMSE#PBF?
All LTC3261HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3261HMSE#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 LTC3261HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3261HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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