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Analog Devices Inc. LTC3122EMSE#PBF
- Part No.:
- LTC3122EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3122EMSE#PBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:553
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Product details
Overview
LTC3122EMSE#PBF 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 down to 500mV after regulation, enabling extended runtime in battery-powered piezo actuators and RF power stages.
For engineers reviewing the LTC3122EMSE#PBF datasheet, LTC3122EMSE#PBF pinout, LTC3122EMSE#PBF application, or LTC3122EMSE#PBF equivalent, key selection criteria include its 100kHz–3MHz adjustable switching frequency, Burst Mode® operation delivering 25µA quiescent current, output disconnect capability, thermal shutdown at 170°C, and compatibility with 12-lead MSOP package layouts requiring minimal external components.
Technical Context
The LTC3122EMSE#PBF implements fixed-frequency current-mode PWM control with adaptive slope compensation for stable regulation across wide VIN/VOUT ratios. 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 while supporting discontinuous conduction mode via zero-current detection.
Startup and regulation rely on a closed-loop 10ms soft-start ramp referencing a 1.202V internal bandgap, with feedback derived from FB pin voltage. Output disconnect is achieved by fully isolating VOUT from VIN during shutdown using internal gate control, eliminating body-diode leakage and enabling full VOUT discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.8V to 5.5V startup; sustains regulation down to 500mV after VOUT ≥ 2.2V - enables deep battery discharge utilization |
| VOUT Range | 2.2V to 15V programmable via resistor divider - supports 12V analog rails and RF biasing |
| Switch Current Limit | 2.5A typical (3.5A max) - ensures robust operation under transient loads without external sensing |
| Quiescent Current | 25µA in Burst Mode®, <1µA in shutdown - minimizes standby drain in always-on sensor nodes |
| Switching Frequency | 100kHz to 3MHz adjustable via RT pin - balances EMI control against solution size in space-constrained designs |
| Efficiency | Up to 95% with synchronous rectification - reduces thermal load in sealed enclosures |
| Output Disconnect | True isolation in shutdown - prevents backfeed and allows VOUT to fully discharge to 0V |
Pinout & Package
The LTC3122EMSE#PBF is housed in a 12-lead plastic MSOP package (4mm × 3mm × 1.1mm), thermally enhanced with exposed PGND pad (Pin 13) requiring soldering to PCB ground plane for rated θJA = 40°C/W performance.
| 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 reference | Low-impedance return path for high di/dt currents; exposed pad must be soldered to PCB ground |
| VIN (3) | Main input supply | Primary power source; supports operation down to 500mV after startup |
| PWM/SYNC (4) | Mode control & clock sync | High = PWM mode; Low = Burst Mode®; external clock input disables Burst Mode and synchronizes oscillator |
| VCC (5) | Internal LDO output | Regulated ~4.25V rail powering gate drivers; sourced from VIN or VOUT depending on operating condition |
| RT (6) | Oscillator frequency set | Resistor-to-SGND programs fSW per fOSC(MHz) = 57.6 / RT(kΩ); enables precise noise shaping |
| VC (7) | Error amplifier output | Loop compensation node; RC network here sets phase margin and transient response |
| FB (8) | Feedback input | Monitors resistive divider; regulates VOUT = 1.202V × (1 + R1/R2) with ±2.1% tolerance over temperature |
| SD (9) | Shutdown control | Logic-level enable: >1.6V = active, <0.25V = shutdown with <1µA IQ |
| SGND (10) | Signal ground reference | Separate from PGND to minimize 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 elevated ground (~5.6V below VOUT) for P-MOSFET gate drive |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Eliminates reverse current and enables full VOUT discharge during shutdown - critical for system-level power sequencing |
| Adjustable Burst Mode® operation | Reduces IQ to 25µA at light loads while maintaining regulation - extends battery life in intermittent-sensing applications |
| Inrush current limiting | 10ms closed-loop soft-start limits peak input surge - protects weak sources like coin cells and supercaps |
| Wide input voltage range post-startup | Operates continuously from 500mV input - extracts maximum energy from depleting primary batteries |
| Robust protection suite | Integrated thermal shutdown (170°C), output overvoltage lockout (16.2V), and short-circuit current foldback - reduces need for external fault management |
Applications
| RF Power Amplifier Bias | Piezo Actuator Driver |
|---|---|
Use Scenario: Generating stable 12V bias for GaAs FET amplifiers in portable radios and IoT transceivers. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated, low-noise, high-efficiency rail with fast transient response. Use Value: Delivers 800mA at 12V from 5V input with 95% efficiency and output disconnect prevents RF stage latch-up during sleep cycles. |
Use Scenario: Driving high-voltage piezoelectric elements in ultrasonic cleaners, inkjet printheads, and precision positioning systems. IC Role / Device Role / Timing Role: Programmable boost regulator supplying 5V–15V outputs with controlled inrush to avoid mechanical shock. Use Value: Adjustable 2.2V–15V output range and 10ms soft-start prevent voltage overshoot that could fracture piezo ceramics. |
| Small DC Motor Supply | 12V Analog Rail Generator |
Use Scenario: Powering miniature brushed DC motors in medical pumps, lab automation, and robotics where battery voltage sags below motor requirements. IC Role / Device Role / Timing Role: High-current boost converter with 2.5A limit and thermal foldback protecting against stall conditions. Use Value: Maintains 12V output from 1.8V–3.6V Li-ion cells even at end-of-discharge, extending operational runtime by >30%. |
Use Scenario: Creating isolated 12V analog supply from 3.3V or 5V system rails in data acquisition, instrumentation, and sensor signal conditioning. IC Role / Device Role / Timing Role: Efficient, low-noise boost stage with synchronized switching to avoid interference with ADC sampling clocks. Use Value: 3MHz synchronization capability eliminates beat frequencies with system clocks, reducing measurement noise floor by 15dB. |
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 switch current limit; fixed 500kHz/1MHz/2.2MHz options; no true output disconnect | Lacks VOUT-to-VIN isolation in shutdown - unsuitable for systems requiring full rail discharge | Prefer for higher-current motor drives where output disconnect is not required |
| MAX17222ETA+ | Lower 1.2A current limit; 1.2V–5.5V input; integrated 1.2MHz oscillator; no RT pin adjustment | Optimized for ultra-low-IQ (0.9µA) but limited to ≤5.5V output - cannot replace LTC3122EMSE#PBF in 12V+ applications | Prefer for sub-5V always-on sensors where size and IQ dominate over output voltage range |
Compared with TPS61088RHLR and MAX17222ETA+, the LTC3122EMSE#PBF uniquely combines 15V output capability, true output disconnect, and 100kHz–3MHz frequency adjustability - making it the only option among the three for battery-powered 12V analog rail generation with strict power sequencing requirements.
Availability
LTC3122EMSE#PBF is available at Aetrix Electronics and suitable for RF power amplifiers, piezo actuator drivers, small DC motor supplies, and 12V analog rail generation requiring stable component supply across industrial and medical product lifecycles.
Supply support for LTC3122EMSE#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 power management ICs with rigorous characterization and long-term product stability.
The LTC3122EMSE#PBF belongs to Linear's synchronous boost converter family designed specifically for low-input-voltage, high-efficiency applications demanding output disconnect, wide VOUT programmability, and robust protection in compact MSOP/DFN packages.
FAQ
What is the minimum input voltage required for LTC3122EMSE#PBF to start up?
The LTC3122EMSE#PBF requires a minimum input voltage of 1.8V to initiate startup and regulate output. Once regulation is established (VOUT ≥ 2.2V), it continues operating with input voltages as low as 500mV - a key feature for maximizing energy extraction from aging or deeply discharged batteries. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" and "Input Voltage Range" parameters.
Does LTC3122EMSE#PBF support true output disconnect, and how is it implemented?
Yes, the LTC3122EMSE#PBF provides true output disconnect by fully isolating VOUT from VIN during shutdown via internal gate control of its P-channel synchronous rectifier. This eliminates body-diode conduction, allowing VOUT to discharge completely to 0V and preventing reverse current flow. The feature is explicitly documented in the Features section and Pin Functions description for Pin 11 (VOUT), and requires no external diodes to function correctly.
What is the purpose of the CAP pin on LTC3122EMSE#PBF, and what capacitor value is recommended?
The CAP pin on LTC3122EMSE#PBF serves as the low-side reference for driving the P-channel synchronous rectifier gate, generating an elevated ground rail approximately 5.6V below VOUT. A low-ESR ceramic capacitor (typically 100nF) must be connected between CAP and VOUT to stabilize this bias voltage. This configuration enables efficient high-side gate drive without external charge pumps, as detailed in the Pin Functions section and Block Diagram.
How does Burst Mode® operation reduce quiescent current in LTC3122EMSE#PBF?
Burst Mode® operation in the LTC3122EMSE#PBF reduces quiescent current to 25µA by entering sleep cycles when output regulation is satisfied: the IC delivers discrete energy packets until VOUT reaches target, then shuts down all switching and bias circuits except essential monitoring. When VOUT droops ~1%, it resumes switching. This behavior is measured and specified in the Electrical Characteristics table under "Quiescent Current, Burst" and validated in Typical Performance Characteristics curves.
Can LTC3122EMSE#PBF be synchronized to an external clock, and what are the requirements?
Yes, the LTC3122EMSE#PBF can synchronize its oscillator to an external clock applied to the PWM/SYNC pin. To do so, an external resistor must be connected from RT to SGND, sized per RT(kΩ) = 73.2 / fSYNC(MHz). The external clock pulse width must be between 100ns and 2µs, and the internal oscillator will lock to frequencies from 100kHz to 3MHz. This capability is confirmed in both the Features list and the Pin Functions description for Pin 4.
LTC3122EMSE#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:
- 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
LTC3122EMSE#PBF FAQ
1.How can I place an order for LTC3122EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3122EMSE#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 LTC3122EMSE#PBF reliable?
The price and inventory of LTC3122EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3122EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3122EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3122EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3122EMSE#PBF?
LTC3122EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3122EMSE#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 LTC3122EMSE#PBF?
For technical support, including LTC3122EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3122EMSE#PBF requirements.
6.How does Aetrix verify that LTC3122EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3122EMSE#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 LTC3122EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3122EMSE#PBF?
All LTC3122EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3122EMSE#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 LTC3122EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3122EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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