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Analog Devices Inc. LTC3122EMSE#TRPBF
- Part No.:
- LTC3122EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3122EMSE#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,283
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Product details
Overview
LTC3122EMSE#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 (start-up) and down to 500mV after regulation, enabling extended runtime in battery-powered piezo actuators and RF power stages.
For engineers reviewing the LTC3122EMSE#TRPBF datasheet, LTC3122EMSE#TRPBF pinout, LTC3122EMSE#TRPBF application, or LTC3122EMSE#TRPBF equivalent, this page delivers verified specifications including 1.202V feedback reference, 25µA Burst Mode quiescent current, 100kHz–3MHz adjustable switching frequency, output disconnect capability, and thermal shutdown at 170°C - all critical for low-voltage boost design validation.
Technical Context
The LTC3122EMSE#TRPBF implements fixed-frequency current-mode PWM control with adaptive slope compensation, enabling fast transient response and stable operation across wide VIN/VOUT ratios. Its dual-MOSFET synchronous rectification uses an N-channel switch (0.121Ω RDS(ON)) and P-channel rectifier (0.188Ω RDS(ON)), supporting up to 95% efficiency at full load.
It integrates a closed-loop 10ms soft-start, zero-current detection for light-load efficiency, anti-ringing control above VOUT ≥ VIN + 2V, and a VCC LDO that auto-selects between VIN and VOUT to sustain gate drive under ultra-low input conditions. Shutdown draws <1µA, and output disconnect ensures VOUT fully discharges when SD is low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V start-up; sustains regulation down to 0.5V after VOUT ≥ 2.2V - enables deep discharge of single-cell Li-ion or NiMH batteries. |
| Output Voltage Range | 2.2V to 15V, set via external resistor divider with 1.202V feedback reference - supports 12V analog rails from 3.3V or 5V sources. |
| Switching Frequency | 100kHz to 3MHz, adjustable via RT pin (RT = 57.6kΩ/fOSC) or synchronizable to external clock - balances efficiency vs. size in space-constrained layouts. |
| Quiescent Current | 25µA in Burst Mode, <1µA in shutdown - extends shelf life and standby time in always-on sensor nodes. |
| Current Limit | 2.5A typical peak switch current (3.5A max), with reduction to 1.6A during short-circuit - protects internal MOSFETs under overload without external sensing. |
| Efficiency | Up to 95% at 800mA, VIN = 5V, VOUT = 12V - achieved via synchronous rectification and low RDS(ON) switches, minimizing conduction losses. |
| Thermal Protection | Thermal shutdown at 170°C (typical), with ~7°C hysteresis - prevents permanent damage during sustained overloads or poor heatsinking. |
Pinout & Package
Package: 12-lead thermally enhanced MSOP (3mm × 4mm × 1.1mm), exposed pad (Pin 13) connected to PGND for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor; internal anti-ringing resistor activates when VOUT ≥ VIN + 2V to suppress EMI in DCM. |
| PGND (2,13) | Power ground | High-current return path for inductor and output capacitor; exposed pad must be soldered to PCB ground plane. |
| VIN (3) | Main input supply | Primary power source; supports operation down to 0.5V post-startup; bypass with ≥4.7µF ceramic capacitor. |
| PWM/SYNC (4) | Mode control & sync input | High = PWM mode; Low = Burst Mode; external clock = synchronization - no floating allowed. |
| VCC (5) | Internal LDO output | Regulated ~4.25V rail derived from VIN or VOUT; powers gate drivers; requires ≥4.7µF capacitor to SGND. |
| RT (6) | Oscillator programming | Resistor to SGND sets fOSC (100kHz–3MHz); formula: RT(kΩ) = 57.6 / fOSC(MHz). |
| VC (7) | Error amplifier output | Loop compensation node; connects RC network to SGND for stability tuning. |
| FB (8) | Feedback input | Monitors resistive divider; 1.202V reference sets VOUT = 1.202V × (1 + R1/R2). |
| SD (9) | Shutdown control | Logic input: >1.6V = enable, <0.25V = shutdown with <1µA IQ and full output disconnect. |
| SGND (10) | Signal ground | Low-noise reference for FB and VC; separate from PGND but tied at single point near output capacitor. |
| 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 - requires 100nF low-ESR ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Eliminates body diode conduction, allowing VOUT to fully discharge and preventing reverse current into VIN during shutdown. |
| Adjustable Burst Mode | Reduces IQ to 25µA at light loads while maintaining regulation - ideal for energy-harvesting and battery-backed systems. |
| Inrush current limiting | 10ms closed-loop soft-start limits peak input surge regardless of output capacitance size or target VOUT. |
| Ultra-low start-up voltage | Starts from 1.8V and sustains operation down to 0.5V - extracts maximum usable energy from aging or depleted batteries. |
| Robust fault protection | Integrated short-circuit current foldback, output overvoltage lockout (16.2V), and thermal shutdown (170°C) - eliminates need for external protection circuitry. |
Applications
| Piezo Actuator Driver | RF Power Supply |
|---|---|
Use Scenario: Driving high-voltage piezoelectric transducers requiring 12V–15V from a 3.3V microcontroller rail. IC Role / Device Role / Timing Role: Synchronous boost converter with output disconnect and inrush limiting to prevent mechanical shock during actuation. Use Value: Enables precise, repeatable displacement control with minimal input surge and zero holdover voltage after deactivation. |
Use Scenario: Generating stable 12V bias for RF power amplifiers in portable transceivers powered by single-cell Li-ion. IC Role / Device Role / Timing Role: High-efficiency, low-noise boost regulator with external clock synchronization to avoid interference with RF bands. Use Value: Delivers clean 12V at up to 800mA with <1µA shutdown current, extending talk time and reducing spectral noise coupling. |
| Small DC Motor Driver | 12V Analog Rail Generator |
Use Scenario: Powering miniature 12V brushed DC motors in medical pumps or lab automation from 5V USB or 3.7V battery inputs. IC Role / Device Role / Timing Role: Step-up converter with robust short-circuit protection and thermal shutdown to survive motor stall conditions. Use Value: Sustains motor torque during startup surges and safely limits power dissipation during jams without external current sense. |
Use Scenario: Creating isolated 12V analog supply for op-amps, ADCs, or DACs in mixed-signal embedded systems using 5V or backup capacitor sources. IC Role / Device Role / Timing Role: Precision-regulated boost converter with 1.202V reference and low output ripple (<2% in Burst Mode). Use Value: Provides stable, low-noise 12V rail with minimal layout area - critical for high-resolution signal conditioning circuits. |
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, 2.7V–12V input range. | Lacks true output disconnect and sub-1V operation - unsuitable for ultra-low-VIN or zero-standby-voltage requirements. | Select when higher output current is needed and input never falls below 2.7V; avoid where VOUT must fully discharge on shutdown. |
| MAX17222ETA+ | Lower 0.5A current limit, 1.8V–5.5V input, 2.5V–5.5V output, 300nA shutdown IQ, no programmable frequency. | Optimized for micropower IoT sensors, not medium-power 12V generation - insufficient for >100mA loads at 12V. | Prefer for sub-100mA, ultra-low-IQ applications; reject for piezo/RF/motor use cases requiring >200mA at ≥7.5V. |
Compared with TPS61088RHLR and MAX17222ETA+, the LTC3122EMSE#TRPBF uniquely combines ultra-low start-up voltage (1.8V), true output disconnect, and 2.5A capability - making it the only viable choice for battery-depleted 12V rail generation with zero-standby leakage and safe turn-off.
Availability
LTC3122EMSE#TRPBF is available at Aetrix Electronics and suitable for RF power supplies, piezo actuator drivers, small DC motor controllers, and 12V analog rail generation requiring stable component supply across industrial and medical product lifecycles.
Supply support for LTC3122EMSE#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-grade qualification and long-term product support.
The LTC3122 belongs to Linear's precision synchronous boost converter family, designed specifically for applications demanding ultra-low input operation, output disconnect, and high efficiency across wide load ranges - especially in portable and energy-sensitive systems.
FAQ
What is the minimum input voltage required to start up the LTC3122EMSE#TRPBF?
The LTC3122EMSE#TRPBF starts up from a minimum input voltage of 1.8V (typical) with VOUT = 0V. Once regulation is established (VOUT ≥ 2.2V), it continues operating with input voltages as low as 0.5V - a key advantage for maximizing energy extraction from depleted 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 LTC3122EMSE#TRPBF provide true output disconnect, and how does it work?
Yes, the LTC3122EMSE#TRPBF provides true output disconnect via its internal P-channel synchronous rectifier. When the SD pin is pulled low (<0.25V), both MOSFET switches turn off and the body diode is blocked, isolating VOUT from VIN. This allows VOUT to fully discharge and eliminates reverse current - critical for safety and power sequencing. The feature is explicitly described in the "Output Disconnect" section of the datasheet and validated in the Absolute Maximum Ratings and Pin Functions.
What is the purpose of the CAP pin on the LTC3122EMSE#TRPBF, and what capacitor value is recommended?
The CAP pin on the LTC3122EMSE#TRPBF serves as the low-side reference for driving the internal P-channel synchronous rectifier gate. A low-ESR ceramic capacitor (typically 100nF) must be connected between CAP and VOUT to generate a local ~5.6V-below-VOUT rail for proper gate biasing. This configuration ensures efficient synchronous rectification and is specified in the Pin Functions section and Typical Application schematic.
How does Burst Mode operation reduce quiescent current in the LTC3122EMSE#TRPBF?
Burst Mode operation in the LTC3122EMSE#TRPBF reduces quiescent current to 25µA by entering sleep cycles when the output voltage reaches regulation. During sleep, both power switches are off and only essential bias circuitry remains active. When VOUT droops ~1%, switching resumes to recharge the output. This behavior is measured and documented in the Electrical Characteristics table under "Quiescent Current, Burst" and illustrated in the Typical Performance Characteristics curves.
Can the LTC3122EMSE#TRPBF be synchronized to an external clock, and what are the requirements?
Yes, the LTC3122EMSE#TRPBF can be synchronized to an external clock applied to the PWM/SYNC pin. The external clock frequency must be between 100kHz and 3MHz, with pulse width between 100ns and 2µs. An RT resistor must also be connected to program the internal oscillator to ~25% below the sync frequency (RT = 73.2kΩ / fSYNC). These requirements are detailed in the Pin Functions and Applications Information sections of the datasheet.
LTC3122EMSE#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
LTC3122EMSE#TRPBF FAQ
1.How can I place an order for LTC3122EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3122EMSE#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 LTC3122EMSE#TRPBF reliable?
The price and inventory of LTC3122EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3122EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3122EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3122EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3122EMSE#TRPBF?
LTC3122EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3122EMSE#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 LTC3122EMSE#TRPBF?
For technical support, including LTC3122EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3122EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3122EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3122EMSE#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 LTC3122EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3122EMSE#TRPBF?
All LTC3122EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3122EMSE#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 LTC3122EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3122EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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