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Analog Devices Inc. LTC3122EDE#TRPBF
- Part No.:
- LTC3122EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3122EDE#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,658
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Product details
Overview
LTC3122EDE#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 down to 500mV after regulation, enabling extended runtime in battery-powered RF power and piezo actuator systems.
For engineers reviewing the LTC3122EDE#TRPBF datasheet, LTC3122EDE#TRPBF pinout, LTC3122EDE#TRPBF application, or LTC3122EDE#TRPBF equivalent, key selection criteria include its 100kHz–3MHz adjustable switching frequency, 25µA Burst Mode quiescent current, output disconnect capability, and thermal performance in the 3mm × 4mm DFN package.
Technical Context
The LTC3122EDE#TRPBF employs current-mode PWM control with adaptive slope compensation for stable operation across wide input/output ranges. 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 and zero-current detection to prevent reverse inductor current.
It integrates a 10ms closed-loop soft-start, overvoltage lockout at ~16.2V, thermal shutdown at 170°C, and anti-ringing control activated when VOUT ≥ VIN + 2V. The VCC regulator delivers ~4.25V from VIN or VOUT, supporting gate drive under low-input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V startup; sustains regulation down to 500mV after VOUT ≥ 2.2V - enables deep discharge of single-cell Li-ion or NiMH batteries. |
| Output Voltage Range | 2.2V to 15V, set by external resistor divider on FB pin - supports 12V analog rails, RF power stages, and piezo biasing. |
| Switch Current Limit | 2.5A typical (3.5A max), independent of VIN/VOUT except below 1.5V - ensures robust short-circuit protection without external sensing. |
| Quiescent Current | 25µA in Burst Mode, <1µA in shutdown - minimizes standby drain in always-on sensor nodes or backup systems. |
| Switching Frequency | Adjustable 100kHz–3MHz via RT resistor; synchronizable to external clock - allows EMI optimization or noise-sensitive timing alignment. |
| Efficiency | Up to 95% at full load (e.g., 5V→12V @ 800mA) - reduces thermal load in space-constrained modules like portable medical devices. |
| Package | 12-lead 3mm × 4mm × 0.75mm DFN with exposed PGND pad - requires soldered thermal pad for θJA = 43°C/W performance. |
Pinout & Package
Package: 12-lead (3mm × 4mm) plastic DFN with exposed PGND pad (Pin 13), rated for –40°C to 125°C operating junction temperature. Exposed pad must be soldered to PCB ground plane for thermal compliance.
| 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 during DCM. |
| PGND (2,13) | Power ground | High-current return path for inductor and output capacitor; exposed pad is PGND and 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 & sync input | Logic high disables Burst Mode; logic low enables Burst Mode; external clock input synchronizes oscillator (100ns–2µs pulses). |
| VCC (5) | Internal LDO output | Regulated ~4.25V rail derived from VIN or VOUT; powers internal circuitry; requires ≥4.7µF capacitor to SGND. |
| RT (6) | Oscillator frequency programming | Resistor to SGND sets fOSC = 57.6 / RT (MHz/kΩ); sets base frequency before synchronization. |
| VC (7) | Error amplifier output | Loop compensation node; connects RC network to stabilize feedback loop per operating conditions. |
| FB (8) | Feedback input | Senses resistor divider output; regulates VOUT = 1.202V × (1 + R1/R2); reference tolerance ±2.1% over temperature. |
| SD (9) | Shutdown control | Logic high (>1.6V) enables operation; logic low (<0.25V) disables converter and disconnects VOUT from VIN. |
| SGND (10) | Signal ground | Low-noise reference for FB, VC, and CAP; separate from PGND but tied at single point near output capacitor. |
| VOUT (11) | Regulated output & rectifier source | Output voltage sense point; also source terminal of internal P-channel synchronous rectifier; disconnects from VIN in shutdown. |
| CAP (12) | Synchronous rectifier gate drive reference | Connects 100nF capacitor to VOUT to generate ~5.6V below VOUT for optimal P-channel gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | VOUT fully discharges to 0V in shutdown with <1µA input current - eliminates backfeed and enables safe hot-swap in multi-rail systems. |
| Programmable Burst Mode | Reduces IQ to 25µA while maintaining regulation - extends battery life in intermittent-load applications like wireless sensors. |
| Inrush current limiting | 10ms closed-loop soft-start with linear reference ramp - prevents input surge during cold start into large capacitive loads. |
| Wide input voltage operation | Starts from 1.8V and sustains regulation down to 500mV - extracts maximum energy from aging or deeply discharged batteries. |
| Robust fault protection | Integrated OVP (~16.2V), thermal shutdown (170°C), and short-circuit current foldback (1.6A limit) - eliminates need for external protection circuitry. |
Applications
| RF Power Amplifier Bias | Piezo Actuator Driver |
|---|---|
|
Use Scenario: Generating stable 12V bias for GaAs FET amplifiers in portable radios or IoT edge transceivers. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated, low-noise 12V rail with output disconnect during sleep cycles. Use Value: 95% efficiency at 800mA and 25µA Burst Mode IQ extend battery life while minimizing thermal rise near sensitive RF sections. |
Use Scenario: Driving high-voltage piezoelectric elements in ultrasonic cleaners, inkjet printheads, or precision positioning stages. IC Role / Device Role / Timing Role: Adjustable-output boost converter delivering 5V–15V with precise soft-start to avoid mechanical shock during actuation. Use Value: 10ms soft-start limits inrush current; output disconnect prevents unintended actuator movement during system standby. |
| Small DC Motor Supply | 12V Analog Rail from Battery |
|
Use Scenario: Powering miniature 12V brushed motors in portable medical pumps or robotic end-effectors. IC Role / Device Role / Timing Role: High-current boost regulator with 2.5A limit and thermal shutdown, enabling continuous torque delivery from low-VIN sources. Use Value: Sustained operation down to 500mV input extends usable battery range; synchronous rectification avoids external Schottky losses. |
Use Scenario: Creating clean 12V analog supply from 3.7V Li-ion or 5V USB power in data acquisition modules or instrumentation front-ends. IC Role / Device Role / Timing Role: Step-up converter with output disconnect and low-noise PWM/Burst Mode operation for noise-sensitive ADC/DAC references. Use Value: External clock synchronization eliminates switching noise coupling into analog signal paths; 1.202V reference ensures tight VOUT accuracy. |
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; fixed 500kHz/1MHz/2.2MHz frequencies; no output disconnect; 2.7V–12V input. | Lacks true output disconnect and sub-1V operation - unsuitable for deep-discharge battery systems requiring VOUT discharge. | Select when higher peak current and simpler frequency setup are prioritized over ultra-low IQ and output isolation. |
| MAX17222ETA+ | Lower 1.2A current limit; 1.8V–5.5V input; 2.5V–5.25V output; 2.5µA IQ in shutdown; no programmable frequency. | Restricted to low-voltage outputs only; lacks adjustable frequency and robust OVP - limited to low-power sensor rails. | Choose for compact, ultra-low-IQ applications where 15V output and 2.5A capability are unnecessary. |
Compared with TPS61088RHLR and MAX17222ETA+, the LTC3122EDE#TRPBF uniquely combines 15V programmable output, true output disconnect, 500mV minimum operating voltage, and 25µA Burst Mode IQ, making it optimal for high-voltage, battery-extending, and safety-critical boost applications.
Availability
LTC3122EDE#TRPBF is available at Aetrix Electronics and suitable for RF power amplifiers, piezo actuators, small DC motor drives, and 12V analog rail generation requiring stable component supply across industrial, medical, and portable electronics programs.
Supply support for LTC3122EDE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3122 belongs to Linear's high-efficiency synchronous boost converter product line, designed specifically for demanding portable and battery-operated systems requiring wide input range, output disconnect, and ultra-low quiescent current.
FAQ
What is the minimum input voltage required to start up the LTC3122EDE#TRPBF?
The LTC3122EDE#TRPBF requires a minimum input voltage of 1.7V to 1.8V for initial startup with VOUT = 0V. Once regulation begins and VOUT reaches ≥2.2V, it continues operating down to 500mV input - a critical feature 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".
Does the LTC3122EDE#TRPBF provide true output disconnect, and how does it function?
Yes, the LTC3122EDE#TRPBF provides true output disconnect: when the SD pin is pulled low, the internal P-channel MOSFET is actively turned off, breaking the conduction path between VOUT and VIN. This allows VOUT to fully discharge to 0V and draws <1µA from VIN. Unlike diode-based solutions, this eliminates body-diode leakage and enables safe hot-swap and zero-backfeed operation - explicitly detailed in the "Output Disconnect" section of the datasheet.
How is the switching frequency programmed on the LTC3122EDE#TRPBF?
The LTC3122EDE#TRPBF switching frequency is set using an external resistor (RT) from the RT pin to SGND, following fOSC(MHz) = 57.6 / RT(kΩ). For example, 57.6kΩ yields 1MHz. When synchronized to an external clock, RT is selected as 73.2 / fSYNC(MHz) to set the internal oscillator ~25% below the sync frequency. This relationship is validated in the "Oscillator" section and Figure 17 of the datasheet.
What protection features are integrated into the LTC3122EDE#TRPBF?
The LTC3122EDE#TRPBF integrates overvoltage lockout (~16.2V), thermal shutdown (170°C typical), short-circuit current foldback (reduced to 1.6A under overload), and input UVLO on the VCC rail (1.6V threshold). These protections are autonomous and require no external components - confirmed in the Absolute Maximum Ratings, Electrical Characteristics, and "Applications Information" sections of the datasheet.
Can the LTC3122EDE#TRPBF operate with input voltage higher than the programmed output voltage?
Yes, the LTC3122EDE#TRPBF maintains regulation even when VIN exceeds VOUT (e.g., 5V input with 3.3V output), though efficiency and output current capability decrease. This buck-mode operation is explicitly supported and characterized in the "VIN > VOUT Operation" subsection and Typical Performance Characteristics (Figure G01–G03). It enables flexible power routing in multi-source systems.
LTC3122EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN 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-DFN (4x3)
LTC3122EDE#TRPBF FAQ
1.How can I place an order for LTC3122EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3122EDE#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 LTC3122EDE#TRPBF reliable?
The price and inventory of LTC3122EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3122EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3122EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3122EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3122EDE#TRPBF?
LTC3122EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3122EDE#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 LTC3122EDE#TRPBF?
For technical support, including LTC3122EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3122EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3122EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3122EDE#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 LTC3122EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3122EDE#TRPBF?
All LTC3122EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3122EDE#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 LTC3122EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3122EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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