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Analog Devices Inc. LTC3122IMSE#PBF
- Part No.:
- LTC3122IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3122IMSE#PBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:262
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Product details
Overview
LTC3122IMSE#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-up DC/DC converter with true output disconnect, 2.5A current limit, adjustable 100kHz–3MHz switching frequency, and operation down to 500mV input after startup. It delivers up to 15V output and supports high-efficiency power conversion in space-constrained battery-powered systems such as piezo actuators and RF power stages.
For engineers reviewing the LTC3122IMSE#PBF datasheet, LTC3122IMSE#PBF pinout, LTC3122IMSE#PBF application, or LTC3122IMSE#PBF equivalent, key selection criteria include its 1.8V–5.5V input range, 2.2V–15V programmable output, <1µA shutdown current, Burst Mode® operation (25µA IQ), and thermally enhanced 12-lead MSOP package with exposed PGND pad.
Technical Context
The LTC3122IMSE#PBF implements fixed-frequency current-mode PWM control with adaptive slope compensation for stable regulation and fast transient response. Its dual-MOSFET synchronous rectification-N-channel switch (0.121Ω RDS(ON)) and P-channel rectifier (0.188Ω RDS(ON))-enables up to 95% efficiency at full load.
It integrates zero-current detection to disable the synchronous rectifier near inductor current zero-crossing, minimizing reverse conduction loss. The internal VCC LDO regulates to ~4.25V from VIN or VOUT, supporting gate drive under low-input conditions, while the CAP pin provides an elevated reference (~5.6V below VOUT) for robust P-channel gate biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V (startup), 0.5V to 5.5V (post-startup); enables deep discharge of single-cell Li-ion or NiMH batteries. |
| Output Voltage Range | 2.2V to 15V (programmable via FB divider); supports 12V analog rails, RF amplifiers, and piezo drivers. |
| Switching Frequency | 100kHz to 3MHz (adjustable via RT resistor or external SYNC clock); balances efficiency vs. size in compact layouts. |
| Peak Switch Current Limit | 2.5A (typical), 3.5A (max); sustains high pulse loads without foldback in motor or actuator drive applications. |
| Quiescent Current (Burst Mode) | 25µA (measured on VIN); extends battery life in always-on sensor nodes and low-power IoT endpoints. |
| Shutdown Current | <1µA; ensures negligible drain during system sleep or backup modes. |
| Efficiency | Up to 95% (synchronous rectification); eliminates external Schottky losses and reduces thermal footprint. |
Pinout & Package
Package: 12-lead thermally enhanced MSOP (3mm × 4mm × 1.1mm), with exposed PGND pad soldered to PCB ground plane for 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 inductor current and output capacitor; exposed pad must be soldered for thermal performance. |
| VIN (3) | Main input supply | Primary power source; supports operation down to 500mV after startup; bypass with ≥4.7µF ceramic capacitor. |
| PWM/SYNC (4) | Mode control & clock sync | High = PWM mode; Low = Burst Mode®; external clock = synchronized operation (100kHz–3MHz). |
| VCC (5) | Internal LDO output | ~4.25V regulated rail powering gate drivers and control logic; derived from VIN or VOUT depending on voltage levels. |
| RT (6) | Oscillator programming | Resistor to SGND sets fOSC = 57.6 / RT (MHz); enables precise frequency tuning or sync offset calibration. |
| VC (7) | Error amplifier output | Loop compensation node; RC network here stabilizes feedback control across load and line variations. |
| FB (8) | Feedback input | Resistive divider tap; sets VOUT = 1.202V × (1 + R1/R2); 1.178–1.225V reference tolerance affects output accuracy. |
| SD (9) | Logic shutdown | Active-high enable (≥1.6V); active-low shutdown (<0.25V); <1µA quiescent draw in shutdown state. |
| SGND (10) | Signal ground reference | Separate from PGND; connects to FB divider bottom and output capacitor negative terminal to minimize noise coupling. |
| VOUT (11) | Regulated output & rectifier source | Drives synchronous rectifier gate; disconnected from VIN during SD = low to prevent backfeed and enable full discharge. |
| CAP (12) | Synchronous rectifier reference | Capacitor to VOUT generates ~5.6V below VOUT for P-channel gate drive; ensures strong turn-on even at low VIN. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | VOUT fully discharges to 0V in shutdown; eliminates body diode leakage and enables safe hot-swap or backup capacitor isolation. |
| Adjustable Burst Mode® | Reduces IQ to 25µA at no load while maintaining regulation; avoids audible switching noise and extends battery runtime. |
| Inrush current limiting | 10ms closed-loop soft-start ramps VOUT reference linearly; prevents input surge during cold start from weak sources. |
| Robust protection suite | Includes overvoltage lockout (16.2V), thermal shutdown (170°C), short-circuit current foldback (1.6A), and UVLO on VCC. |
| Low-voltage operation | Starts from 1.8V and sustains regulation down to 0.5V input; maximizes usable energy from aging or depleted batteries. |
Applications
| Piezo Actuators | RF Power Amplifiers |
|---|---|
Use Scenario: Driving high-voltage piezoelectric transducers requiring 12–15V from a 3.3V or 5V supply in ultrasonic cleaners or precision positioning systems. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated high-voltage rail with fast transient response and minimal output droop during pulsed actuation. Use Value: Enables compact, efficient high-voltage generation without external transformers or charge pumps; output disconnect prevents residual voltage holdover between pulses. |
Use Scenario: Supplying 12V bias to GaAs or GaN RF power amplifiers in portable radios or IoT edge transceivers powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: High-efficiency step-up regulator delivering stable 12V rail with low-noise PWM or synchronized operation to avoid interference with RF front-end. Use Value: Maintains >90% efficiency across wide load range; SYNC capability allows clock alignment to baseband timing to suppress switching sidebands in sensitive bands. |
| Small DC Motors | 12V Analog Rail from Battery |
Use Scenario: Powering miniature brushed DC motors (e.g., in medical pumps or micro-drones) requiring 8–12V from a 2.5–3.6V lithium primary cell. IC Role / Device Role / Timing Role: Boost converter with inrush limiting and robust short-circuit protection to handle motor stall currents up to 2.5A peak. Use Value: Internal 2.5A current limit and thermal shutdown prevent damage during stall; low 500mV operating floor extends runtime beyond conventional boost ICs. |
Use Scenario: Generating clean 12V analog supply for op-amps, ADCs, or DACs in battery-powered instrumentation where noise and dropout are critical. IC Role / Device Role / Timing Role: Precision-regulated boost stage with low-output-ripple Burst Mode and optional external SYNC for EMI-sensitive signal chains. Use Value: 1.202V ±2.5mV reference and tight FB input current (≤50nA) ensure <1% output error; CAP pin architecture maintains gate drive strength even at low VIN. |
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 4.5A current limit, fixed 500kHz/1MHz/2.2MHz options, no true output disconnect, 2.7V min startup. | Better suited for high-current continuous loads; unsuitable where VOUT must fully discharge or operate below 2.7V. | Select TPS61088RHLR only if >3A output and fixed-frequency simplicity outweigh need for sub-2V startup or output isolation. |
| MAX17222ETA+ | Lower 1.2A current limit, 1.2V–5.5V input, integrated inductor option, no SYNC or programmable frequency. | Targeted at ultra-low-power wearables; lacks thermal enhancement and high-voltage capability of LTC3122IMSE#PBF. | Choose MAX17222ETA+ only for space-constrained, sub-500mA applications where integrated inductor simplifies layout and 15V output is unnecessary. |
Compared with TPS61088RHLR and MAX17222ETA+, the LTC3122IMSE#PBF uniquely combines sub-1V post-startup operation, true output disconnect, and 100kHz–3MHz adjustability-making it optimal for battery-depletion-critical, high-voltage, and noise-sensitive analog/RF systems where thermal management and functional safety matter.
Availability
LTC3122IMSE#PBF is available at Aetrix Electronics and suitable for RF power stages, piezo actuator drivers, small DC motor controllers, and 12V analog rail generation requiring stable component supply across industrial, medical, and portable electronics programs.
Supply support for LTC3122IMSE#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 LTC3122 product line was designed for demanding portable and industrial applications requiring wide input range, high efficiency at light loads, and robust fault protection-especially where battery depletion, thermal constraints, or output isolation are critical.
FAQ
What is the minimum input voltage required to start up the LTC3122IMSE#PBF?
The LTC3122IMSE#PBF requires a minimum of 1.8V on VIN to initiate startup. Once regulation is established and VOUT reaches ≥2.2V, it continues operating with input voltages as low as 0.5V-enabling maximum energy extraction from deeply discharged batteries. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" and "Input Voltage Range".
Does the LTC3122IMSE#PBF support true output disconnect, and how does it function?
Yes, the LTC3122IMSE#PBF provides true output disconnect: when SD is pulled low, the internal P-channel MOSFET is actively turned off, breaking the conductive path between VOUT and VIN. This prevents body diode conduction, allows VOUT to fully discharge to 0V, and eliminates reverse current flow-critical for backup capacitor isolation and hot-swap safety. The feature is explicitly documented in the Features and Applications sections.
How is switching frequency programmed on the LTC3122IMSE#PBF?
Switching frequency is set using an external resistor (RT) from Pin 6 (RT) to SGND, per the formula fOSC(MHz) = 57.6 / RT(kΩ). For example, a 57.6kΩ resistor yields 1MHz. Alternatively, the internal oscillator can be synchronized to an external clock applied to the PWM/SYNC pin (Pin 4), with RT adjusted to ~25% below the sync frequency for reliable locking.
What protection features are integrated into the LTC3122IMSE#PBF?
The LTC3122IMSE#PBF integrates overvoltage lockout (16.2V), thermal shutdown (170°C typical), short-circuit current foldback (reduced to 1.6A under overload), and VCC undervoltage lockout (1.6V). These are verified in the Absolute Maximum Ratings, Electrical Characteristics, and Applications Information sections-including explicit thresholds and recovery behaviors.
Can the LTC3122IMSE#PBF operate with an input voltage higher than the programmed output voltage?
Yes-the LTC3122IMSE#PBF maintains regulation even when VIN exceeds VOUT (buck-like mode), though efficiency and output current capability decrease. This behavior is documented in the "VIN > VOUT Operation" subsection of Applications Information and confirmed in Typical Performance Characteristics curves showing load current vs. VIN across multiple VOUT settings.
LTC3122IMSE#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
LTC3122IMSE#PBF FAQ
1.How can I place an order for LTC3122IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3122IMSE#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 LTC3122IMSE#PBF reliable?
The price and inventory of LTC3122IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3122IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3122IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3122IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3122IMSE#PBF?
LTC3122IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3122IMSE#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 LTC3122IMSE#PBF?
For technical support, including LTC3122IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3122IMSE#PBF requirements.
6.How does Aetrix verify that LTC3122IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3122IMSE#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 LTC3122IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3122IMSE#PBF?
All LTC3122IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3122IMSE#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 LTC3122IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3122IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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