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Analog Devices Inc. LTC3414IFE#TRPBF
- Part No.:
- LTC3414IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3414IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
LTC3414IFE#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC regulator delivering up to 4A output current at 0.8V–5V with ±2% output voltage accuracy, 67mΩ P-channel and 50mΩ N-channel internal MOSFETs, and programmable switching frequency from 300kHz to 4MHz. It supports point-of-load regulation in notebook computers and portable instruments.
For engineers reviewing the LTC3414IFE#TRPBF datasheet, LTC3414IFE#TRPBF pinout, LTC3414IFE#TRPBF application, or LTC3414IFE#TRPBF equivalent, key selection considerations include its 2.25V–5.5V input range, Burst Mode® vs forced continuous operation trade-offs, OPTI-LOOP® compensation for transient optimization, 64µA quiescent current in Burst Mode, and 20-lead exposed TSSOP package thermal performance (θJA = 38°C/W).
Technical Context
The LTC3414IFE#TRPBF employs constant-frequency current-mode control with internal P-channel (67mΩ) and N-channel (50mΩ) synchronous switches, enabling high efficiency (up to 95%) and 100% duty cycle low-dropout operation. Its error amplifier drives the ITH pin to regulate peak inductor current based on VFB feedback against a 0.8V reference.
Switching frequency is set by an external resistor on RT or synchronized externally via SYNC/MODE (300kHz–4MHz). The device implements slope compensation recovery to maintain consistent peak current across duty cycles >40%, and includes overtemperature protection, power-good monitoring (±7.5% window), and selectable Burst Mode® with adjustable burst clamp voltage (0–1V on SYNC/MODE).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion, USB, and intermediate bus rails without external LDO pre-regulation. |
| Output Current | Up to 4A - sufficient for core logic, FPGAs, and DDR memory rails in portable systems. |
| Output Voltage Accuracy | ±2% - ensures stable supply to sensitive analog and digital loads under line/load/temperature variation. |
| Quiescent Current | 64µA in Burst Mode - extends battery runtime in always-on subsystems like real-time clocks or sensor interfaces. |
| Switching Frequency | 300kHz to 4MHz - enables compact magnetics (e.g., 0.47µH inductor at 4MHz) while balancing gate loss vs conduction loss. |
| RDS(ON) (P-FET/N-FET) | 67mΩ / 50mΩ - reduces conduction losses and thermal rise at full load, supporting high-efficiency point-of-load conversion. |
| Feedback Reference | 0.8V - allows precise low-voltage outputs (e.g., 0.8V, 1.0V, 1.2V) using standard resistor dividers without external references. |
Pinout & Package
Package: 20-lead plastic TSSOP with exposed pad (Pin 21), requiring solder connection to PCB for thermal and electrical integrity (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1,10,11,20) | Power Ground | Low-impedance return path for high-current switch node; must be connected directly to CIN/COUT (–) terminals. |
| RT (2) | Oscillator Timing Input | Resistor-to-ground sets switching frequency; ROSC = 294kΩ yields ~1MHz per datasheet Figure G05. |
| SYNC/MODE (3) | Mode Control & Sync Input | 0–1V selects Burst Mode clamp level; SVIN tie forces continuous mode; external clock sync (300kHz–4MHz) locks switching edge. |
| RUN/SS (4) | Enable & Soft-Start | <0.5V disables IC (IQ < 1µA); capacitor-to-ground controls output ramp time during startup. |
| SGND (5) | Signal Ground | Reference for VFB, ITH, and compensation network; must connect to PGND at single point to avoid noise coupling. |
| PVIN (7,14) | Power Input Supply | High-current VIN feed; requires local ceramic decoupling to PGND to suppress switching transients. |
| SW (8,9,12,13) | Switch Node | Drain connection of internal P-FET/N-FET; connects directly to inductor; high dv/dt node requiring minimized trace area. |
| SVIN (16) | Signal Input Supply | Bias rail for internal circuitry; decoupled to SGND with 0.1µF ceramic to reduce noise sensitivity. |
| PGOOD (17) | Open-Drain Status Output | Pulled low when VOUT deviates >±7.5%; used for system power sequencing and fault detection. |
| ITH (18) | Error Amplifier Output | Controls peak inductor current threshold; voltage range 0.2V–1.4V; critical for loop stability and transient response tuning. |
| VFB (19) | Feedback Input | Monitors resistive divider output; regulates VOUT to 0.8V reference; input bias current <0.2µA minimizes divider error. |
| Exposed Pad (21) | Thermal & Electrical Ground | Mandatory solder connection to SGND plane; primary thermal path to PCB; improves θJA by ~15°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows external RC network on ITH to optimize transient response across wide output capacitance (22µF–470µF) and load ranges. |
| Selectably Forced Continuous/Burst Mode® | Enables noise-sensitive applications (e.g., audio, RF) to avoid subharmonic interference while retaining 95% peak efficiency at full load. |
| Adjustable Burst Clamp | External voltage on SYNC/MODE (0–1V) sets minimum peak inductor current (0–7A), directly controlling output ripple vs light-load efficiency trade-off. |
| 100% Duty Cycle Operation | Extends battery life in portable systems by maintaining regulation down to VIN ≈ VOUT + IOUT × RDS(ON), eliminating need for secondary LDO. |
| Integrated Power Good Monitor | PGOOD open-drain output provides system-level fault signaling without external comparators or voltage dividers. |
Applications
| Core Logic Power Supply | Notebook CPU Core Rail |
|---|---|
Use Scenario: Providing 1.0V/3A to ARM Cortex-A series SoCs in ultra-thin notebooks with aggressive thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with OPTI-LOOP® compensation for fast load-step response to CPU DVFS transitions. Use Value: 64µA quiescent current in Burst Mode extends standby time; 4MHz operation enables 0.47µH inductor, reducing board area by 40% vs 500kHz designs. | Use Scenario: Delivering 0.85V/4A to Intel Core i-series processors during turbo boost events with <100mV undershoot. IC Role / Device Role / Timing Role: High-current point-of-load regulator with forced continuous mode to suppress switching noise near high-speed SerDes lanes. Use Value: 67mΩ/50mΩ RDS(ON) limits junction temperature rise to <35°C at 4A, avoiding thermal throttling during sustained workloads. |
| Portable Instrument ADC Reference Rail | Distributed Power System Intermediate Bus |
Use Scenario: Generating ultra-low-noise 2.5V/1A supply for 16-bit SAR ADCs in handheld test equipment with battery-only operation. IC Role / Device Role / Timing Role: Low-ripple regulated source using forced continuous mode and ceramic output capacitors to minimize PSRR degradation. Use Value: ±2% output accuracy and 0.8V reference ensure absolute voltage tolerance <±25mV, meeting ADC reference spec without post-regulation. | Use Scenario: Stepping down 12V intermediate bus to 3.3V/4A for multiple downstream POL converters in industrial PLC backplanes. IC Role / Device Role / Timing Role: High-efficiency intermediate converter with synchronizable frequency to avoid beat frequencies in multi-rail systems. Use Value: External clock sync (300kHz–4MHz) eliminates EMI peaks in narrowband EMC testing; 95% efficiency reduces heat sink requirements by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20RJER | 4A, 2.95–16V input, 0.6V reference, integrated MOSFETs (3.5mΩ/1.8mΩ), but no Burst Mode®; higher IQ (2.5mA active) | Requires external enable sequencing; less suitable for battery-critical applications due to higher light-load IQ | Prefer for wide-input industrial systems where 16V max input and lower RDS(ON) outweigh Burst Mode® needs |
| MP2315GJ-Z | 4A, 4.5–28V input, 0.8V reference, 65mΩ/35mΩ MOSFETs, but fixed 500kHz frequency and no sync capability | Lacks frequency programming/sync; limited to fixed-frequency EMI filtering; no adjustable burst clamp | Prefer for cost-sensitive 12V-input applications where 500kHz simplifies filter design and thermal margin is ample |
Compared with TPS544B20RJER and MP2315GJ-Z, the LTC3414IFE#TRPBF offers superior light-load efficiency via programmable Burst Mode®, wider input range down to 2.25V for single-cell Li-ion, and flexible frequency tuning-making it optimal for portable, battery-constrained, and noise-sensitive designs despite its narrower max input voltage.
Availability
LTC3414IFE#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance over –40°C to 85°C.
Supply support for LTC3414IFE#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 (now part of Analog Devices, Inc. following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3414IFE#TRPBF belongs to Linear Technology's high-efficiency monolithic DC/DC regulator product line, designed specifically for demanding point-of-load applications in portable, computing, and industrial systems where thermal density, light-load efficiency, and transient response are critical.
FAQ
What is the maximum output current capability of the LTC3414IFE#TRPBF?
The LTC3414IFE#TRPBF delivers up to 4A of continuous output current under typical conditions (TA = 25°C, 20-lead TSSOP with exposed pad soldered). Derating applies above 85°C ambient or with insufficient PCB copper; the datasheet specifies 4A with θJA = 38°C/W and recommended layout. Peak current limit is 6–8A, but sustained operation beyond 4A risks thermal shutdown.
Does the LTC3414IFE#TRPBF support synchronization to an external clock?
Yes, the LTC3414IFE#TRPBF supports external clock synchronization via the SYNC/MODE pin. An external TTL/CMOS clock signal between 300kHz and 4MHz can lock the internal oscillator's switching edge to its falling edge. The internal resistor-set frequency must be ~25% lower than the sync frequency to ensure proper slope compensation. This feature is confirmed in the "Frequency Synchronization" section of the LTC3414 datasheet Rev C.
How does Burst Mode® operation improve efficiency in the LTC3414IFE#TRPBF?
Burst Mode® operation in the LTC3414IFE#TRPBF reduces quiescent current to 64µA by disabling most internal circuitry and holding both MOSFETs off during light loads. The device wakes only when output voltage droop triggers reactivation, minimizing gate charge and switching losses. This achieves >85% efficiency at 1mA load-critical for battery-powered standby functions-while maintaining tight output regulation via the adjustable burst clamp voltage on SYNC/MODE.
What is the purpose of the exposed pad (Pin 21) on the LTC3414IFE#TRPBF package?
The exposed pad (Pin 21) on the LTC3414IFE#TRPBF is a thermally and electrically conductive surface that must be soldered to the PCB ground plane. It serves as the primary thermal path (θJC = 10°C/W) and reduces junction-to-ambient resistance by ~15°C/W versus non-soldered pads. Per datasheet Package Information, failure to solder this pad risks exceeding TJMAX = 125°C under 4A load, triggering overtemperature protection.
Can the LTC3414IFE#TRPBF operate with input voltages below 2.5V?
Yes, the LTC3414IFE#TRPBF is fully specified to operate from 2.25V to 5.5V input. Its ability to start and regulate down to 2.25V makes it suitable for single-cell Li-ion (2.7–4.2V) and LiFePO4 (2.0–3.6V) batteries without pre-regulation. However, RDS(ON) increases at low VIN, so thermal design must verify junction temperature remains below 125°C at full load-particularly near dropout (e.g., 2.5V input to 2.5V output).
LTC3414IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 4A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3414IFE#TRPBF FAQ
1.How can I place an order for LTC3414IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3414IFE#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 LTC3414IFE#TRPBF reliable?
The price and inventory of LTC3414IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3414IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3414IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3414IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3414IFE#TRPBF?
LTC3414IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3414IFE#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 LTC3414IFE#TRPBF?
For technical support, including LTC3414IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3414IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3414IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3414IFE#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 LTC3414IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3414IFE#TRPBF?
All LTC3414IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3414IFE#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 LTC3414IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3414IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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