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Analog Devices Inc. LTC3122IMSE#TRPBF
- Part No.:
- LTC3122IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3122IMSE#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,128
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Product details
Overview
LTC3122IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-up DC/DC converter with true output disconnect, 2.5A current limit, and programmable output voltage up to 15V. It operates from input voltages as low as 1.8V at startup and sustains regulation down to 500mV after startup, enabling extended runtime in battery-powered piezo actuators and RF power stages.
For engineers reviewing the LTC3122IMSE#TRPBF datasheet, LTC3122IMSE#TRPBF pinout, LTC3122IMSE#TRPBF application, or LTC3122IMSE#TRPBF equivalent, key selection criteria include its 100kHz–3MHz adjustable switching frequency, <1µA shutdown current, Burst Mode® operation delivering 25µA quiescent current, output disconnect capability, and thermally enhanced 12-lead MSOP package rated for –40°C to 125°C.
Technical Context
The LTC3122IMSE#TRPBF implements fixed-frequency current-mode PWM control with adaptive slope compensation for stable loop response and minimal output filtering. Its dual-MOSFET synchronous rectification-using an N-channel switch (0.121Ω RDS(ON)) and P-channel rectifier (0.188Ω RDS(ON))-enables up to 95% efficiency across load ranges.
It integrates a 10ms closed-loop soft-start, zero-current detection for light-load efficiency, anti-ringing control activated when VOUT ≥ VIN + 2V, and overvoltage lockout at ~16.2V. The VCC regulator delivers ~4.25V from VIN or VOUT depending on operating conditions, and the RT pin allows precise oscillator programming via external resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V startup; sustains regulation down to 500mV after startup - enables deep discharge battery utilization |
| Output Voltage Range | 2.2V to 15V, adjustable via FB resistor divider - supports 12V analog rails and high-voltage piezo drive |
| Switch Current Limit | 2.5A typical (3.5A max), independent of input/output voltage - ensures robust overload handling in motor and actuator loads |
| Quiescent Current (Burst) | 25µA - minimizes standby power in always-on sensor nodes and backup systems |
| Shutdown Current | <1µA - eliminates parasitic drain during system sleep modes |
| Switching Frequency | 100kHz to 3MHz, adjustable via RT pin or synchronizable to external clock - balances EMI, efficiency, and solution size |
| Efficiency | Up to 95% with synchronous rectification - reduces thermal load in space-constrained modules |
Pinout & Package
The LTC3122IMSE#TRPBF is housed in a 12-lead thermally enhanced MSOP package (4mm × 3mm × 1.1mm) with exposed PGND pad soldered to PCB ground plane for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Power switch node | Connects to inductor; internal anti-ringing resistor activates when VOUT ≥ VIN + 2V to suppress EMI |
| PGND (2,13) | Power ground return | Low-impedance path for high di/dt currents; exposed pad must be soldered to PCB ground plane |
| VIN (3) | Main input supply | Primary power source; supports operation down to 500mV after startup |
| PWM/SYNC (4) | Mode control & sync input | High = PWM mode; Low = Burst Mode®; external clock = synchronized operation |
| VCC (5) | Internal LDO output | ~4.25V regulated rail powering gate drivers and control logic; derived from VIN or VOUT |
| RT (6) | Oscillator frequency set | Resistor-to-SGND programs fOSC = 57.6 / RT (MHz/kΩ); enables precise noise optimization |
| VC (7) | Error amplifier output | Loop compensation node; RC network sets phase margin and transient response |
| FB (8) | Feedback input | 1.202V reference input; sets VOUT = 1.202V × (1 + R1/R2) |
| SD (9) | Logic shutdown control | <0.25V = shutdown (<1µA IQ); >1.6V = enabled - supports clean system-level power sequencing |
| SGND (10) | Signal ground reference | Separate from PGND to avoid noise coupling into feedback path |
| VOUT (11) | Regulated output & rectifier source | Drives synchronous P-channel MOSFET; disconnected from VIN during shutdown |
| CAP (12) | Synchronous rectifier bias reference | Capacitor-to-VOUT creates ~5.6V below VOUT to drive P-MOSFET gate above source |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | VOUT fully discharges to 0V in shutdown; prevents reverse current and enables safe hot-swap |
| Adjustable Burst Mode® | Reduces IQ to 25µA at no load while maintaining regulation - critical for energy-harvesting and battery longevity |
| Inrush current limiting | 10ms closed-loop soft-start limits peak input surge - protects weak sources like supercapacitors and coin cells |
| Robust protection suite | Includes short-circuit current foldback (1.6A limit), thermal shutdown (170°C), and output overvoltage lockout (16.2V) |
| Wide-input, high-efficiency boost | Operates from 500mV post-startup with up to 95% efficiency - maximizes usable energy from depleted batteries |
Applications
| Piezo Actuator Drive | RF Power Amplifier Bias |
|---|---|
Use Scenario: Driving high-voltage piezoelectric transducers in ultrasonic cleaners and precision positioning systems requiring 12V–15V from single-cell Li-ion or alkaline sources. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated high-voltage rail with true output disconnect to prevent residual charge retention. Use Value: Enables full discharge between actuation cycles, eliminating drift and improving repeatability; 2.5A current limit supports fast slew-rate charging. | Use Scenario: Generating stable 12V bias for GaN or LDMOS RF power amplifiers in portable radios and IoT edge transceivers powered by 3.3V or 5V supplies. IC Role / Device Role / Timing Role: High-efficiency, low-noise boost stage with external clock synchronization to avoid interference with RF bands. Use Value: 3MHz max switching frequency allows EMI filtering outside sensitive RF bands; <1µA shutdown current preserves battery life during receive-only intervals. |
| Small DC Motor Supply | 12V Analog Rail Generator |
Use Scenario: Powering miniature brushed DC motors (e.g., in medical pumps or micro-drones) from 3.7V Li-ion batteries where torque consistency requires stable 5V–12V output. IC Role / Device Role / Timing Role: Adjustable-output boost converter with inrush limiting and output disconnect to prevent motor back-EMF from damaging upstream circuitry. Use Value: 800mA output at 12V from 5V input ensures sufficient stall current; zero-current detection improves light-load efficiency during idle periods. | Use Scenario: Creating a clean, isolated 12V analog supply for op-amps, ADCs, and sensors in industrial data loggers using 5V USB or 3.3V system rails. IC Role / Device Role / Timing Role: Precision-regulated boost converter with low ripple (<2% pk-pk in Burst Mode) and programmable soft-start to avoid analog reference disturbance. Use Value: Feedback accuracy of ±2.1% (1.178V–1.225V) ensures stable 12V ±0.25V; CAP pin architecture enables efficient synchronous rectification without external FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 5.5A current limit; fixed 500kHz/1MHz switching; no output disconnect or sub-1V operation | Better suited for high-current digital loads; unsuitable for ultra-low-VIN or true-disconnect requirements | Select only if >3A output and no deep-discharge operation needed |
| MAX17222ETA+ | Lower 1.2A current limit; 0.5V startup; integrated inductor option; no programmable frequency or external sync | Optimized for space-constrained wearables; lacks thermal enhancement and high-voltage capability | Prefer for sub-1W, size-sensitive designs where 12V output is not required |
Compared with TPS61088RHLR and MAX17222ETA+, the LTC3122IMSE#TRPBF uniquely combines sub-1V operational headroom, true output disconnect, and 3MHz programmability-making it the only choice for battery-depleted piezo and RF bias applications demanding both ultra-low-VIN resilience and clean shutdown behavior.
Availability
LTC3122IMSE#TRPBF is available at Aetrix Electronics and suitable for piezo actuator drive, RF power amplifier bias, and 12V analog rail generation requiring stable component supply, long-lifecycle assurance, and guaranteed temperature-grade compliance.
Supply support for LTC3122IMSE#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 legacy of high-performance power management ICs with rigorous automotive and industrial qualification.
The LTC3122 product line was designed specifically for high-efficiency, wide-input-range boost conversion in space- and power-constrained applications such as portable instrumentation, medical devices, and wireless infrastructure-emphasizing ultra-low quiescent current, true output isolation, and robust fault protection.
FAQ
What is the minimum input voltage required to start up the LTC3122IMSE#TRPBF?
The LTC3122IMSE#TRPBF requires a minimum input voltage of 1.7V (typical) to initiate startup, with guaranteed operation from 1.8V across temperature. Once regulation is established and VOUT ≥ 2.2V, the device continues operating down to 500mV input - a critical feature for extracting maximum energy from deeply discharged batteries. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" and "Input Voltage Range After VOUT ≥ 2.2V".
Does the LTC3122IMSE#TRPBF provide true output disconnect, and how does it function?
Yes, the LTC3122IMSE#TRPBF provides true output disconnect: when the SD pin is pulled low (<0.25V), the internal P-channel synchronous rectifier is fully turned off, eliminating body-diode conduction and allowing VOUT to discharge completely to 0V. This prevents reverse current flow and enables safe hot-swap and system-level power sequencing. The feature is explicitly documented in the "Features" section and "Output Disconnect" subsection of the Applications Information.
What is the purpose of the CAP pin on the LTC3122IMSE#TRPBF, and how should it be connected?
The CAP pin on the LTC3122IMSE#TRPBF serves as the low-side reference for driving the gate of the internal P-channel synchronous rectifier. It must be connected to VOUT via a low-ESR capacitor (typically 100nF) to generate a local ground rail ~5.6V below VOUT, ensuring sufficient gate-source voltage to fully enhance the P-MOSFET. This configuration is detailed in the Pin Functions section and Block Diagram, and omission causes loss of synchronous rectification and reduced efficiency.
Can the LTC3122IMSE#TRPBF be synchronized to an external clock, and what are the requirements?
Yes, the LTC3122IMSE#TRPBF can be synchronized to an external clock applied to the PWM/SYNC pin. To achieve synchronization, an external resistor must be connected from RT to SGND, programmed to ~25% below the desired sync frequency (RT = 73.2 / fSYNC). The external clock pulse width must be between 100ns and 2µs. This capability is specified in the "Oscillator" section and Electrical Characteristics table under "SYNC Frequency Range".
What thermal considerations apply to the LTC3122IMSE#TRPBF in the MSOP package?
The LTC3122IMSE#TRPBF in the 12-lead MSOP package has θJA = 40°C/W and θJC = 10°C/W, but these ratings assume the exposed PGND pad (Pin 13) is soldered to a large PCB ground plane. Failure to do so results in significantly higher thermal impedance and potential thermal shutdown. The Absolute Maximum Ratings specify TJMAX = 150°C, and thermal shutdown activates at ~170°C (typical), with recovery after ~7°C hysteresis. These values are defined in the "Absolute Maximum Ratings" and "Pin Configuration" sections.
LTC3122IMSE#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:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.2V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 2.5A (Switch)
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3122IMSE#TRPBF FAQ
1.How can I place an order for LTC3122IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3122IMSE#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 LTC3122IMSE#TRPBF reliable?
The price and inventory of LTC3122IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3122IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3122IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3122IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3122IMSE#TRPBF?
LTC3122IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3122IMSE#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 LTC3122IMSE#TRPBF?
For technical support, including LTC3122IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3122IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3122IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3122IMSE#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 LTC3122IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3122IMSE#TRPBF?
All LTC3122IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3122IMSE#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 LTC3122IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3122IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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