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Analog Devices Inc. LTC3122IDE#TRPBF
- Part No.:
- LTC3122IDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3122IDE#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:656
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Product details
Overview
LTC3122IDE#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 systems such as piezo actuators and RF power stages.
For engineers reviewing the LTC3122IDE#TRPBF datasheet, LTC3122IDE#TRPBF pinout, LTC3122IDE#TRPBF application, or LTC3122IDE#TRPBF equivalent, key selection criteria include its 100kHz–3MHz adjustable switching frequency, 25µA Burst Mode quiescent current, output disconnect capability, and dual-package availability in thermally enhanced 12-lead DFN (3mm × 4mm).
Technical Context
The LTC3122IDE#TRPBF implements fixed-frequency current-mode PWM control with adaptive slope compensation for stable operation across wide VIN/VOUT ratios and fast load transient response. Its internal N-channel MOSFET switch (RDS(ON) = 0.121Ω) and P-channel synchronous rectifier enable up to 95% efficiency while supporting discontinuous conduction mode via zero-current detection.
It integrates a 10ms closed-loop soft-start, programmable oscillator (via RT pin), external clock synchronization (PWM/SYNC pin), and robust protection including thermal shutdown (170°C), output overvoltage lockout (~16.2V), and short-circuit current limiting (1.6A under overload). The VCC regulator derives bias from VIN or VOUT, maintaining 4.25V ±0.25V operation independent of input source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V (startup); continues 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 (adjustable via FB resistor divider) - supports 5V, 7.5V, 12V, and 15V analog rails from low-voltage sources. |
| Switching Frequency | 100kHz to 3MHz (programmable via RT pin or synchronizable to external clock) - allows optimization for EMI reduction or minimal footprint using small inductors. |
| Peak Switch Current Limit | 2.5A (typical), 3.5A (max) - ensures reliable operation into heavy loads while limiting stress on internal MOSFETs. |
| Quiescent Current | 25µA in Burst Mode, <1µA in shutdown - preserves battery life in always-on or low-duty-cycle applications. |
| Efficiency | Up to 95% (synchronous rectification) - minimizes thermal rise and extends operating time in space-constrained designs. |
| Package | 12-lead 3mm × 4mm × 0.75mm DFN (exposed PGND pad) - provides low thermal resistance (θJA = 43°C/W) for high-power density layouts. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed thermal pad (Pin 13 = PGND). Must be soldered to PCB ground plane for rated thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace to minimize EMI and ringing. |
| 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 | Accepts 1.8V–5.5V; powers internal circuitry when >3.5V, otherwise VCC derives from VOUT. |
| PWM/SYNC (4) | Mode control & sync input | Logic high disables Burst Mode; logic low enables Burst Mode; external clock input synchronizes oscillator. |
| VCC (5) | Internal LDO output | Regulated ~4.25V rail powering gate drivers and control logic; requires ≥4.7µF ceramic bypass to SGND. |
| RT (6) | Oscillator programming | Resistor-to-SGND sets fSW: fOSC(MHz) = 57.6 / RT(kΩ); enables precise frequency tuning or sync offset. |
| VC (7) | Error amplifier output | Connects to RC compensation network - determines loop stability and transient response bandwidth. |
| FB (8) | Feedback input | Senses resistive divider from VOUT; regulates output using 1.202V reference - sets VOUT = 1.202V × (1 + R1/R2). |
| SD (9) | Shutdown control | Logic high (>1.6V) enables operation; logic low (<0.25V) disables converter and reduces IQ to <1µA. |
| SGND (10) | Signal ground | Low-noise reference for FB, VC, and CAP - must tie directly to (–) side of output capacitor, separate from PGND at single point. |
| VOUT (11) | Regulated output & rectifier source | Drives synchronous P-MOSFET gate; disconnected from VIN during shutdown - enables true output discharge. |
| CAP (12) | Synchronous rectifier reference | Capacitor-to-VOUT creates elevated ground (~5.6V below VOUT) for P-MOSFET gate drive - requires 100nF low-ESR ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | VOUT fully discharges to 0V in shutdown and draws no reverse current - eliminates need for external blocking diode in backup power paths. |
| Adjustable Burst Mode operation | Reduces quiescent current to 25µA at light loads while maintaining regulation - extends battery life without sacrificing start-up reliability. |
| Inrush current limiting | Integrated 10ms closed-loop soft-start limits peak input surge during turn-on - prevents brownout in weak input sources like supercapacitors. |
| Wide input voltage range after startup | Operates continuously with VIN as low as 500mV once VOUT ≥ 2.2V - maximizes usable energy from depleted batteries or energy-harvesting sources. |
| Robust fault protection | Includes thermal shutdown (170°C), output overvoltage lockout (~16.2V), short-circuit current limiting (1.6A), and UVLO on VCC - ensures safe operation under abnormal conditions. |
Applications
| Piezo Actuator Driver | RF Power Amplifier Supply |
|---|---|
Use Scenario: Driving high-voltage piezoelectric transducers requiring 12V–15V from a 3.3V or 5V microcontroller rail. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated, low-noise, high-current output with true output disconnect to prevent backfeed during sleep modes. Use Value: Enables precise actuator positioning with minimal power loss and no residual voltage holdover after deactivation. |
Use Scenario: Generating clean 12V bias for GaAs or SiGe RF power amplifiers in portable radios or IoT edge devices. IC Role / Device Role / Timing Role: High-efficiency step-up regulator with selectable Burst Mode/PWM operation and external clock sync to avoid interference with RF bands. Use Value: Delivers stable 12V at up to 800mA with <1% ripple in PWM mode and <25µA standby draw - critical for spectral purity and battery longevity. |
| Small DC Motor Drive | 12V Analog Rail Generator |
Use Scenario: Powering miniature 12V brushed DC motors in medical pumps or precision lab equipment from a 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Boost converter with inrush limiting and output disconnect - prevents motor stall current from collapsing input rail during startup. Use Value: Ensures consistent motor torque across full battery discharge curve while eliminating reverse current during motor coast-down. |
Use Scenario: Creating isolated 12V analog supply for op-amps, ADCs, or DACs in mixed-signal systems powered by 5V USB or 3.3V logic rails. IC Role / Device Role / Timing Role: Precision-adjustable boost regulator with low noise, high PSRR, and programmable switching frequency to avoid sensitive analog bands. Use Value: Provides clean, regulated 12V with <1µA shutdown drain - maintains signal integrity and system sleep current budget. |
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; 2.5V–18V output. | Lacks true output disconnect and sub-1V operation - unsuitable for ultra-low-VIN or zero-VOUT discharge requirements. | Select when higher output current is needed and output disconnect is not required; verify layout compatibility with larger package (14-pin QFN). |
| MAX17222ETA+ | Lower 1.2A current limit; 1.8V–5.5V input; 2.5V–5.5V output; 300nA shutdown current; no external frequency programming. | Restricted to ≤5.5V output and lacks programmable frequency or sync - limited to low-voltage, ultra-low-IQ applications only. | Choose only for sub-5.5V outputs where nanoscale shutdown current outweighs flexibility; not suitable for 12V/15V rail generation. |
Compared with TPS61088RHLR and MAX17222ETA+, the LTC3122IDE#TRPBF uniquely combines sub-1V post-startup operation, true output disconnect, and 100kHz–3MHz programmability - making it irreplaceable for battery-depletion-critical and zero-standby-leakage applications.
Availability
LTC3122IDE#TRPBF is available at Aetrix Electronics and suitable for piezo actuator drivers, RF power supplies, small DC motor controllers, and 12V analog rail generation requiring stable component supply across industrial, medical, and portable electronics programs.
Supply support for LTC3122IDE#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 characterization and long-term product support.
The LTC3122IDE#TRPBF belongs to Linear's high-efficiency synchronous boost converter family, designed specifically for demanding applications requiring ultra-low input voltage operation, output disconnect, and flexible frequency control in compact DFN packages.
FAQ
What is the minimum input voltage required for the LTC3122IDE#TRPBF to start up?
The LTC3122IDE#TRPBF requires a minimum input voltage of 1.8V to initiate startup. Once regulation is established (VOUT ≥ 2.2V), it continues operating with input voltages as low as 500mV - a key advantage for maximizing energy extraction from deeply discharged batteries or energy-harvesting sources. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" and "Input Voltage Range After VOUT ≥ 2.2V".
Does the LTC3122IDE#TRPBF support true output disconnect, and how is it implemented?
Yes, the LTC3122IDE#TRPBF provides true output disconnect by disabling the internal P-channel synchronous rectifier during shutdown (SD pin low), preventing body diode conduction. This allows VOUT to fully discharge to 0V and eliminates reverse current flow from VOUT to VIN. The feature is explicitly documented in the device description, Applications section, and Pin Functions - and requires no external components to function.
How is the switching frequency programmed on the LTC3122IDE#TRPBF?
The LTC3122IDE#TRPBF switching frequency is set via an external resistor (RT) connected between the RT pin and SGND, using the formula fOSC(MHz) = 57.6 / RT(kΩ). For example, a 57.6kΩ resistor yields 1MHz operation. The oscillator can also be synchronized to an external clock applied to the PWM/SYNC pin - in which case RT is selected to set the free-running frequency ~25% below the sync frequency.
What protection features does the LTC3122IDE#TRPBF include?
The LTC3122IDE#TRPBF integrates thermal shutdown (170°C typical), output overvoltage lockout (~16.2V), short-circuit current limiting (reduced to 1.6A under overload), and input undervoltage lockout on the VCC rail (<1.6V). These protections are detailed in the Absolute Maximum Ratings, Electrical Characteristics, and Applications Information sections - ensuring robust operation across industrial temperature ranges and fault conditions.
Can the LTC3122IDE#TRPBF operate with input voltage higher than output voltage?
Yes, the LTC3122IDE#TRPBF maintains regulation even when VIN exceeds VOUT (buck-like operation), though efficiency and output current capability decrease. This behavior is explicitly noted in the Applications Information section under "VIN > VOUT Operation", and is supported by the internal control architecture - but design trade-offs (e.g., reduced IOUT, higher losses) must be evaluated per application.
LTC3122IDE#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)
LTC3122IDE#TRPBF FAQ
1.How can I place an order for LTC3122IDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3122IDE#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 LTC3122IDE#TRPBF reliable?
The price and inventory of LTC3122IDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3122IDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3122IDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3122IDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3122IDE#TRPBF?
LTC3122IDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3122IDE#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 LTC3122IDE#TRPBF?
For technical support, including LTC3122IDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3122IDE#TRPBF requirements.
6.How does Aetrix verify that LTC3122IDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3122IDE#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 LTC3122IDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3122IDE#TRPBF?
All LTC3122IDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3122IDE#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 LTC3122IDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3122IDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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