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Analog Devices Inc. LTC3814IFE-5#TRPBF
- Part No.:
- LTC3814IFE-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3814IFE-5#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,212
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Product details
Overview
LTC3814IFE-5#TRPBF from Analog Devices (formerly Linear Technology) is a 60V synchronous step-up DC/DC controller IC using constant off-time peak current mode control to deliver high duty cycles without a sense resistor. It features ±0.5% 0.8V reference accuracy, 25MHz error amplifier bandwidth, 1Ω gate drivers, and programmable soft-start. It is used in 24V fan supplies and 48V telecom power systems.
For engineers reviewing the LTC3814IFE-5#TRPBF datasheet, LTC3814IFE-5#TRPBF pinout, LTC3814IFE-5#TRPBF application, or LTC3814IFE-5#TRPBF equivalent, key selection criteria include its no-RSENSE current sensing, adjustable off-time via IOFF/VOFF pins, PGOOD output with ±10% regulation window, and thermal shutdown protection in the –40°C to 125°C operating range.
Technical Context
The LTC3814IFE-5#TRPBF implements a constant off-time (COT) current-mode architecture where top MOSFET on-time is set by IOFF current and VOFF voltage (tOFF = VVOFF/IIOFF × 76pF), enabling stable operation up to 60V output with minimal external components. Its cycle-by-cycle current limit is adjusted via VRNG pin (0.5V–2V), setting nominal sense thresholds from 60mV to 320mV.
It integrates dual N-channel MOSFET drivers: TG delivers floating high-side drive referenced to SW with BOOST supply, while BG provides low-side drive referenced to PGND from INTVCC. The 25MHz error amplifier enables fast load transient response, and the internal 0.8V reference achieves ±0.5% DC accuracy over –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Up to 60V - supports high-voltage boost applications such as 48V telecom and industrial bus supplies. |
| Reference Voltage Accuracy | ±0.5% at 0.8V - ensures tight output regulation without trimming, critical for precision 24V/48V rails. |
| Error Amplifier Bandwidth | 25MHz - enables sub-microsecond load transient recovery, essential for server and networking equipment. |
| Minimum Off-Time | <100ns - allows high switching frequencies and high VIN/VOUT ratios while maintaining stability. |
| Gate Driver Strength | 1Ω pulldown RDS(ON), 0.7–1A peak source - drives large paralleled MOSFETs for >10A output designs. |
| Operating Junction Temp | –40°C to 125°C - qualified for automotive under-hood and industrial control environments. |
| Shutdown Supply Current | <230μA - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
Pinout & Package
Thermally enhanced 16-pin TSSOP package (FE) with exposed GND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity. Package dimensions: 5mm × 4.4mm × 1.1mm, 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IOFF (1) | Off-time current input | Sets one-shot timer current; tie resistor from VOUT to configure frequency independent of VIN. |
| VOFF (2) | Off-time voltage input | Defines comparator trip point; resistive divider from VIN makes tOFF proportional to input voltage. |
| VRNG (3) | Sense voltage limit set | Configures max current sense threshold (60–320mV); defaults to 95mV (GND) or 215mV (INTVCC). |
| PGOOD (4) | Power good open-drain output | Pulled low when VFB exits ±10% window for ≥125μs; enables system sequencing and fault reporting. |
| ITH (5) | Error amp compensation / current threshold | Voltage sets peak inductor current limit; 1.2V = zero-sense condition; used for loop compensation. |
| VFB (6) | Feedback input | Connects to resistor divider from VOUT; regulates output via 0.8V internal reference. |
| RUN/SS (7) | Enable / soft-start input | <0.9V disables controller; capacitor to ground controls ramp rate of current limit during startup. |
| SGND (8) | Signal ground | Reference for all small-signal pins; must connect to PGND at single point to avoid noise coupling. |
| NDRV (9) | External pass device driver | Drives NMOS gate for linear regulator generating INTVCC; enables high-input-voltage biasing. |
| EXTVCC (10) | External driver supply | ≥4.7V enables internal LDO to power INTVCC; reduces dependency on bootstrap charging. |
| INTVCC (11) | Main IC and BG driver supply | 4.35–14V supply; powers internal circuitry and bottom gate driver; bypass with 1μF X5R capacitor. |
| BG (12) | Bottom gate drive | Swings PGND to INTVCC; drives source of low-side N-MOSFET; 1Ω RDS(ON) ensures fast turn-off. |
| PGND (13) | Bottom gate return | Source connection for BG driver; ties directly to low-side MOSFET source and power ground plane. |
| SW (14) | Switch node | Connects to inductor and BOOST capacitor; swings from Schottky drop below GND to VOUT. |
| TG (15) | Top gate drive | Floating driver referenced to SW; powered by BOOST; enables true high-side N-MOSFET control. |
| BOOST (16) | Top gate driver supply | Bypassed to SW with 0.1μF X5R; charged via external diode from INTVCC; sustains TG drive during long off-times. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses bottom MOSFET RDS(ON) for current sensing - eliminates sense resistor losses and board space in high-current boost stages. |
| Dual N-channel MOSFET synchronous drive | Enables >95% efficiency at high output voltages by replacing Schottky diode with actively controlled low-RDS(ON) switch. |
| Adjustable cycle-by-cycle current limit | VRNG pin sets precise peak current threshold (60–320mV) - allows accurate overcurrent protection without calibration. |
| Programmable soft-start | RUN/SS pin capacitor controls ITH ramp rate - prevents inrush current and output overshoot during power-up. |
| Power good output with hysteresis | PGOOD asserts after 125μs delay and includes 1.5–3% hysteresis - ensures reliable system enable/disable sequencing. |
| Undervoltage lockout on INTVCC | 4.2V rising-edge UVLO with 0.5V hysteresis - guarantees sufficient gate drive before enabling MOSFETs, preventing shoot-through. |
Applications
| 24V Fan Supplies | 48V Telecom Power |
|---|---|
Use Scenario: Boosting 12V or 24V intermediate bus to 24V for high-speed cooling fans in servers and base stations. IC Role / Device Role: Synchronous step-up controller managing dual N-MOSFET power stage with no sense resistor. Use Value: Enables >94% efficiency at 4A load while eliminating sense resistor heat and footprint in space-constrained fan modules. |
Use Scenario: Generating regulated 48V from 24V or 36V input in telecom rectifiers and remote radio units. IC Role / Device Role: High-voltage boost controller with PGOOD monitoring and overvoltage protection for telecom safety compliance. Use Value: Supports 60V absolute max output and built-in OVP ensures safe operation during line transients per GR-1089-CORE. |
| Networking Equipment | Automotive Control Systems |
Use Scenario: Providing 24V/36V auxiliary rails for PoE++ switches, optical line cards, and FPGA I/O banks. IC Role / Device Role: Fast-transient boost controller with 25MHz error amplifier and programmable soft-start. Use Value: Delivers <100μs recovery from 50% load steps - maintains stable voltage for sensitive SerDes and PHY interfaces. |
Use Scenario: Generating 24V from 12V battery for ADAS camera modules, radar ECUs, and infotainment displays. IC Role / Device Role: AEC-Q200–capable boost controller with –40°C to 125°C operation and robust fault protection. Use Value: Integrated UVLO, thermal shutdown, and PGOOD meet ISO 16750-2 cold-crank and load-dump immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-up controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Wide VIN (4–90V), adjustable frequency (50kHz–900kHz), but requires external current sense resistor. | Preferred for ultra-wide input range or where sense resistor tolerance is acceptable. | Select LTC3780 if input can exceed 14V or if design requires fixed-frequency PWM instead of COT control. |
| LM5122MMX/NOPB | 4.5–60V input, integrated 1.5A gate drivers, but lacks no-RSENSE capability and has lower reference accuracy (±1%). | Suitable for cost-sensitive industrial supplies where ±1% regulation suffices. | Choose LM5122 for simpler BOM with integrated drivers, but verify current sensing method matches layout constraints. |
Compared with LTC3814IFE-5#TRPBF, LTC3780 offers wider input range but adds sense resistor loss and complexity, while LM5122 trades reference accuracy and no-RSENSE for integration and lower cost-making LTC3814IFE-5#TRPBF optimal for precision, high-efficiency 24V/48V boost where board space and thermal performance are critical.
Availability
LTC3814IFE-5#TRPBF is available at Aetrix Electronics and suitable for 24V fan supplies, 48V telecom power systems, and automotive control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3814IFE-5#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LTC3814-5 belongs to Linear's high-voltage synchronous controller product line, designed specifically for efficient, no-RSENSE boost conversion in telecom, networking, and industrial power systems demanding reliability at 60V output.
FAQ
What is the maximum output voltage supported by the LTC3814IFE-5#TRPBF?
The LTC3814IFE-5#TRPBF supports output voltages up to 60V, as confirmed by Absolute Maximum Ratings (SW voltage continuous: –1V to 70V) and typical application circuits delivering 24V and 50V outputs. This rating assumes proper MOSFET selection, thermal management, and layout practices per the datasheet guidelines.
Does the LTC3814IFE-5#TRPBF require an external current sense resistor?
No, the LTC3814IFE-5#TRPBF does not require an external current sense resistor. It uses the RDS(ON) of the bottom N-channel MOSFET for current sensing, as explicitly stated in the FEATURES section and verified in the OPERATION description. This eliminates sense resistor power loss and PCB area in high-current boost designs.
How is the switching frequency programmed on the LTC3814IFE-5#TRPBF?
The switching frequency of the LTC3814IFE-5#TRPBF is programmed indirectly via the IOFF and VOFF pins. A resistor from VOUT to IOFF sets the off-time current, while a resistive divider from VIN to VOFF sets the off-time voltage. The relationship tOFF = VVOFF/IIOFF × 76pF determines frequency, allowing VIN-compensated operation.
What is the purpose of the VRNG pin on the LTC3814IFE-5#TRPBF?
The VRNG pin on the LTC3814IFE-5#TRPBF sets the nominal current sense voltage threshold (60–320mV) for cycle-by-cycle current limiting. Applying 0.5V–2V via a resistive divider from INTVCC configures the maximum sense voltage; grounding or tying to INTVCC selects default values of 95mV or 215mV respectively.
Is the LTC3814IFE-5#TRPBF suitable for automotive applications?
Yes, the LTC3814IFE-5#TRPBF is rated for –40°C to 125°C junction temperature and includes undervoltage lockout, overvoltage protection, thermal shutdown, and PGOOD monitoring - features aligned with automotive control system requirements. While not AEC-Q200 certified out-of-box, its specifications and robustness support automotive-grade designs with appropriate qualification testing.
LTC3814IFE-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.35V ~ 14V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3814IFE-5#TRPBF FAQ
1.How can I place an order for LTC3814IFE-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3814IFE-5#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 LTC3814IFE-5#TRPBF reliable?
The price and inventory of LTC3814IFE-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3814IFE-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3814IFE-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3814IFE-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3814IFE-5#TRPBF?
LTC3814IFE-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3814IFE-5#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 LTC3814IFE-5#TRPBF?
For technical support, including LTC3814IFE-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3814IFE-5#TRPBF requirements.
6.How does Aetrix verify that LTC3814IFE-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3814IFE-5#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 LTC3814IFE-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3814IFE-5#TRPBF?
All LTC3814IFE-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3814IFE-5#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 LTC3814IFE-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3814IFE-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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