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Analog Devices Inc. LTC3814IFE-5#PBF
- Part No.:
- LTC3814IFE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3814IFE-5#PBF.pdf
- Description:
- IC REG CTRLR BOOST 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,032
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Product details
Overview
LTC3814IFE-5#PBF 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% 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#PBF datasheet, LTC3814IFE-5#PBF pinout, LTC3814IFE-5#PBF application, or LTC3814IFE-5#PBF equivalent, key selection criteria include its 60V output capability, no-RSENSE current sensing, dual N-channel MOSFET drive, PGOOD monitoring, and thermal performance in the 16-pin TSSOP package with exposed pad.
Technical Context
The LTC3814IFE-5#PBF implements a constant off-time (COT) current-mode architecture where top MOSFET on-time is set by IOFF current and VOFF voltage, enabling stable operation at high duty cycles. Its cycle-by-cycle current limit is adjusted via VRNG pin voltage (0.5V–2V), setting nominal sense thresholds from 60mV to 320mV without external resistors.
It integrates dual 1Ω gate drivers (TG and BG), supports floating BOOST supply generation via external diode and capacitor, and includes undervoltage lockout on INTVCC (4.2V threshold), overvoltage protection, and 125μs PGOOD delay. The error amplifier delivers 65–100dB open-loop gain and 25MHz unity-gain bandwidth for fast transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Up to 60V - enables high-voltage boost applications like 48V telecom and industrial bus supplies. |
| Reference Accuracy | ±0.5% at –40°C to 125°C - ensures tight regulation across full operating temperature range. |
| Error Amplifier Bandwidth | 25MHz - provides rapid line/load transient response without complex compensation. |
| Gate Driver Strength | 1Ω pulldown RDS(ON), 0.7–1A peak source - drives large or paralleled MOSFETs with minimal switching loss. |
| Minimum Off-Time | <100ns - supports high input-to-output voltage ratios (e.g., 5V→60V) while maintaining stable frequency. |
| Operating Junction Temp | –40°C to 125°C - qualified for automotive, industrial, and telecom environments with thermal shutdown. |
| PGOOD Threshold | ±10% of VFB with 125μs delay - provides reliable power-good signaling for system sequencing and fault detection. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed GND pad (Pin 17), thermally enhanced for high-power operation. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IOFF (1) | Off-time current input | Sets one-shot timer current; ties to VOUT via ROFF to stabilize switching frequency vs. load. |
| VOFF (2) | Off-time voltage input | Defines on-time comparator trip point; tied to VIN divider to make tON proportional to input voltage. |
| VRNG (3) | Sense voltage limit set | Configures maximum current sense threshold (60–320mV) using internal scaling; eliminates need for sense resistor. |
| PGOOD (4) | Open-drain power-good output | Pulled low when VFB deviates >±10%; 125μs delay prevents false triggering during transients. |
| ITH (5) | Error amp compensation / current threshold | Voltage sets peak inductor current threshold (0–2.6V); also serves as loop compensation node. |
| VFB (6) | Feedback input | Connects to resistor divider from VOUT; regulates output to 0.8V reference with ±0.5% accuracy. |
| RUN/SS (7) | Enable & soft-start control | Pull <0.9V to shut down (IQ <230μA); capacitor to ground controls ramp rate of current limit for controlled start-up. |
| SGND (8) | Signal ground reference | Return for all small-signal pins (VFB, ITH, RUN/SS); must connect to PGND at single point to avoid noise coupling. |
| NDRV (9) | External LDO pass device driver | Drives gate of external NMOS to generate 5.5V INTVCC from VIN/VOUT; supports high-input-voltage biasing. |
| EXTVCC (10) | External driver supply input | When >4.7V, powers INTVCC via internal LDO and disables NDRV path; improves efficiency at higher input voltages. |
| INTVCC (11) | Main IC and bottom gate supply | 4.5–14V supply for internal circuitry and BG driver; requires local 1μF X5R bypass to SGND/PGND. |
| BG (12) | Bottom gate drive output | Drives source-connected N-MOSFET switch; swings from PGND to INTVCC with 1Ω pulldown and 1A peak source. |
| PGND (13) | Bottom gate return | Source connection for BG driver MOSFET; must be low-impedance path to system ground plane. |
| SW (14) | Switch node connection | Connects to inductor and BOOST capacitor; voltage swings from ~–0.3V (Schottky drop) to VOUT. |
| TG (15) | Top gate drive output | Drives gate of high-side N-MOSFET; powered from BOOST, returns to SW - true floating drive for synchronous boost. |
| BOOST (16) | Top gate driver supply | Bypassed to SW with 0.1μF X5R; charged via external diode from INTVCC during off-time to sustain TG drive. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses bottom MOSFET RDS(ON) for current sensing - reduces BOM cost, board space, and power loss. |
| Dual N-channel MOSFET synchronous drive | Integrated TG and BG drivers eliminate need for external level-shifters or bootstrap ICs in high-side configuration. |
| Programmable soft-start via RUN/SS capacitor | Controls inrush current and output voltage ramp rate by modulating ITH threshold - prevents overshoot and stress. |
| Power good output with ±10% window and 125μs delay | Enables safe system power sequencing and fault isolation without external comparators or timers. |
| Adjustable off-time/frequency via IOFF and VOFF | Allows frequency stabilization across wide VIN and VOUT ranges - critical for telecom and industrial input variations. |
| Thermally enhanced 16-pin TSSOP with exposed pad | θJA = 38°C/W enables >4A output designs without heatsink - validated for continuous operation at 125°C junction. |
Applications
| 24V Fan Supply | 48V Telecom Power |
|---|---|
|
Use Scenario: Boosting 12V or 24V battery or rail to stable 24V for high-speed cooling fans in base stations and servers. IC Role / Device Role / Timing Role: Synchronous step-up controller managing dual N-MOSFET switches, regulating output with ±0.5% accuracy and fast transient response. Use Value: Eliminates sense resistor losses and enables compact layout with integrated 1Ω drivers - improves efficiency by ≥2% vs. resistor-based controllers. |
Use Scenario: Generating regulated 48V from 24V or 36V intermediate bus in telecom equipment and remote radio units. IC Role / Device Role / Timing Role: High-voltage boost controller delivering up to 60V with programmable off-time to maintain stable frequency across varying input conditions. Use Value: Supports wide input range (4.5–14V INTVCC) and includes EXTVCC switchover - extends operational life under brownout and hot-swap events. |
| Networking Equipment PSU | Automotive Control System |
|
Use Scenario: Providing isolated 24V/48V auxiliary rails for PoE switches, routers, and optical line terminals requiring high reliability. IC Role / Device Role / Timing Role: Primary controller in non-isolated boost stage, using VRNG pin to set current limit and PGOOD for system-level fault reporting. Use Value: ±10% PGOOD window with 125μs delay ensures robust power sequencing - meets GR-1089 and IEC 61000-4 immunity requirements. |
Use Scenario: Generating 24V or 36V from 12V vehicle battery for ADAS sensors, infotainment displays, or ECU sub-systems. IC Role / Device Role / Timing Role: Automotive-grade (–40°C to 125°C) synchronous boost controller with undervoltage lockout and thermal protection. Use Value: INTVCC UVLO at 4.2V prevents MOSFET turn-on with insufficient gate drive - avoids shoot-through and ensures AEC-Q100-compliant startup behavior. |
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 |
|---|---|---|---|
| LTC3780 | Wide VIN range (4–90V), but requires external current sense resistor and lacks VRNG-based current limit programming. | Preferred for ultra-high input voltage (>60V) or precision current limiting with shunt resistors. | LTC3814IFE-5#PBF offers lower BOM cost and simpler layout where RDS(ON)-based sensing suffices. |
| LM5122 | Fixed 100kHz–1MHz frequency range, no adjustable off-time; uses traditional current-mode with sense resistor. | Better suited for fixed-frequency EMI-constrained designs requiring predictable spectral content. | LTC3814IFE-5#PBF provides superior light-load efficiency and wider output voltage flexibility (up to 60V). |
Compared with LTC3780 and LM5122, the LTC3814IFE-5#PBF uniquely combines no-RSENSE operation, 60V output capability, and programmable off-time - making it optimal for cost-sensitive, high-efficiency 24V/48V boost converters where layout simplicity and thermal performance are critical.
Availability
LTC3814IFE-5#PBF is available at Aetrix Electronics and suitable for 24V fan supplies, 48V telecom power systems, and networking equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3814IFE-5#PBF 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 with deep expertise in precision power conversion.
The LTC3814IFE-5#PBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for efficient, compact, and reliable step-up power conversion in telecom, industrial, and automotive applications.
FAQ
What is the maximum output voltage supported by the LTC3814IFE-5#PBF?
The LTC3814IFE-5#PBF supports output voltages up to 60V, as confirmed by Absolute Maximum Ratings (SW voltage continuous: –1V to 70V) and Typical Application circuits achieving 24V and 50V outputs. This limit is enforced by internal protection and practical duty-cycle constraints - exceeding 60V risks violating safe operating area and may trigger overvoltage protection.
Does the LTC3814IFE-5#PBF require an external current sense resistor?
No, the LTC3814IFE-5#PBF does not require an external current sense resistor. It uses the RDS(ON) of the bottom N-channel MOSFET for current sensing, with the VRNG pin (0.5V–2V) setting the nominal sense voltage (60–320mV). This is explicitly stated in the FEATURES section and verified in the OPERATION description and Electrical Characteristics table (VSENSE(MAX) values).
What is the purpose of the EXTVCC pin on the LTC3814IFE-5#PBF?
The EXTVCC pin on the LTC3814IFE-5#PBF provides an alternative power source for the INTVCC rail. When EXTVCC exceeds 4.7V, an internal switch connects it to INTVCC via an LDO, disabling the NDRV-controlled external linear regulator. This improves efficiency and reduces heat in high-input-voltage applications - a feature confirmed in the PIN FUNCTIONS and ELECTRICAL CHARACTERISTICS sections.
How is soft-start implemented on the LTC3814IFE-5#PBF?
Soft-start on the LTC3814IFE-5#PBF is implemented by connecting a capacitor from the RUN/SS pin to ground. During startup, this capacitor controls the ramp rate of the ITH voltage, which directly modulates the peak current limit threshold. This prevents inrush current and output overshoot - a function detailed in the PIN FUNCTIONS section and validated in the TYPICAL PERFORMANCE CHARACTERISTICS (Start-Up waveform).
What thermal considerations apply to the LTC3814IFE-5#PBF package?
The LTC3814IFE-5#PBF uses a 16-lead TSSOP with exposed GND pad (Pin 17), specified with θJA = 38°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity. Operating junction temperature is rated from –40°C to 125°C, and overtemperature protection activates above TJMAX to prevent damage - all confirmed in PACKAGE/ORDER INFORMATION and ABSOLUTE MAXIMUM RATINGS.
LTC3814IFE-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3814IFE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3814IFE-5#PBF 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#PBF reliable?
The price and inventory of LTC3814IFE-5#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3814IFE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3814IFE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3814IFE-5#PBF?
LTC3814IFE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3814IFE-5#PBF 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#PBF?
For technical support, including LTC3814IFE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3814IFE-5#PBF requirements.
6.How does Aetrix verify that LTC3814IFE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3814IFE-5#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3814IFE-5#PBF?
All LTC3814IFE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3814IFE-5#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3814IFE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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