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Analog Devices Inc. LTC3814EFE-5#PBF
- Part No.:
- LTC3814EFE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3814EFE-5#PBF.pdf
- Description:
- IC REG CTRLR BOOST 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,793
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Product details
Overview
LTC3814EFE-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% 0.8V reference accuracy, 25MHz error amplifier bandwidth, 1Ω gate drivers, and programmable soft-start - enabling stable 24V fan supplies and 48V telecom power systems.
For engineers reviewing the LTC3814EFE-5#PBF datasheet, LTC3814EFE-5#PBF pinout, LTC3814EFE-5#PBF application, or LTC3814EFE-5#PBF equivalent, key selection criteria include its 60V max output capability, cycle-by-cycle current limit without RSENSE, adjustable off-time via IOFF/VOFF pins, PGOOD monitoring, and thermal performance in the 16-pin TSSOP package with exposed pad.
Technical Context
The LTC3814EFE-5#PBF 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 frequency stability across input voltage variations. Its 25MHz error amplifier delivers fast transient response, and internal 0.8V reference ensures ±0.5% DC regulation over –40°C to 125°C.
It drives dual N-channel MOSFETs synchronously: TG provides floating 60V-capable high-side drive referenced to SW, while BG delivers 1Ω pulldown strength to PGND; both drivers are powered from INTVCC (4.5–14V). Protection includes undervoltage lockout on INTVCC (4.2V threshold), output overvoltage shutdown, and PGOOD with 125μs delay and ±10% window.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Voltage | 60V - supports high-voltage applications like 48V telecom and industrial bus supplies without external level-shifting. |
| Reference Accuracy | ±0.5% at 0.8V - enables precise output regulation critical for sensitive loads such as optical transceivers or ADC references. |
| Error Amplifier BW | 25MHz - ensures sub-microsecond load transient recovery, minimizing output droop during rapid current steps. |
| Min Off-Time | <100ns - allows operation at high VIN/VOUT ratios (e.g., 12V→60V) while maintaining stable switching frequency. |
| Gate Driver Strength | 1Ω pulldown RDS(ON) for TG/BG - supports fast slew of large QG MOSFETs, reducing transition losses in multi-amp designs. |
| Shutdown Current | <230μA - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Operating Temp Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed thermal pad (Pin 17 = GND), θJA = 38°C/W. Requires soldering of exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IOFF (1) | Off-time current input | Sets one-shot timer current; resistor from VOUT to IOFF programs switching frequency inversely proportional to VOUT. |
| VOFF (2) | Off-time voltage input | Defines comparator trip point; resistive divider from VIN makes tOFF proportional to VIN for input-voltage-compensated frequency. |
| VRNG (3) | Sense voltage limit set | Configures nominal current-sense threshold (60–320mV) using INTVCC-referenced divider; eliminates need for external sense resistor. |
| PGOOD (4) | Power-good open-drain output | Asserts low when VFB exits ±10% regulation window for ≥125μs; enables system sequencing and fault reporting. |
| ITH (5) | Error amp compensation / current threshold | Voltage sets peak inductor current threshold (0–2.6V range); direct interface for loop compensation and current limiting. |
| VFB (6) | Feedback input | Connects to resistor divider from VOUT; internal 0.8V reference enables precise output voltage setting (e.g., 24V, 48V). |
| RUN/SS (7) | Run enable / soft-start | Pull below 0.9V to shut down; capacitor to SGND controls ramp rate of ITH for controlled startup and inrush limiting. |
| SGND (8) | Signal ground | Reference for all small-signal pins (VFB, ITH, RUN/SS); must connect to PGND at single point to avoid noise coupling. |
| NDRV (9) | External pass device driver | Drives gate of NMOS linear regulator for INTVCC generation when EXTVCC is unavailable or out-of-range. |
| EXTVCC (10) | External driver supply | When >4.7V, powers INTVCC via internal LDO and disables NDRV path; improves efficiency in high-input-voltage applications. |
| INTVCC (11) | Main IC and gate driver supply | 4.5–14V supply for internal circuitry and BG driver; requires local 1μF X5R bypass to SGND/PGND. |
| BG (12) | Bottom gate drive | Drives source of bottom N-MOSFET; swings from PGND to INTVCC with 1Ω pulldown for fast turn-off. |
| PGND (13) | Bottom gate return | Source connection for BG driver and bottom MOSFET; must be low-impedance path to system ground plane. |
| SW (14) | Switch node | Connection to inductor, BOOST capacitor, and Schottky diode cathode; experiences full VOUT swing (–1V to 70V). |
| TG (15) | Top gate drive | Floating driver for top N-MOSFET gate; powered from BOOST, returns to SW - enables true high-side synchronous rectification. |
| BOOST (16) | Top gate driver supply | Charged via diode from INTVCC to SW; requires 0.1μF X5R capacitor to SW for stable floating bias. |
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 vs. discrete shunt solutions. |
| Dual N-channel MOSFET synchronous drive | Eliminates external Schottky diode conduction loss - improves efficiency by 3–5% at high load currents in 24V/48V boost converters. |
| Programmable soft-start | Capacitor on RUN/SS pin controls ITH ramp rate - prevents output overshoot and limits inrush current into large output capacitors. |
| Power good output with hysteresis | PGOOD asserts after 125μs delay and releases with 1.5% hysteresis - ensures reliable system power sequencing and avoids false fault triggers. |
| Adjustable cycle-by-cycle current limit | VRNG pin sets maximum sense voltage (60–320mV); enables precise overcurrent protection matched to MOSFET RDS(ON) and temperature drift. |
| Thermally enhanced TSSOP package | Exposed pad (Pin 17) soldered to PCB ground achieves θJA = 38°C/W - sustains 4A+ output current in compact layouts without heatsinks. |
Applications
| 24V Fan Supplies | 48V Telecom Power |
|---|---|
Use Scenario: High-reliability cooling for 5G base station RF amplifiers requiring stable 24V at up to 4A with minimal thermal derating. IC Role / Device Role / Timing Role: Synchronous step-up controller regulating 12V input to 24V output; manages dual N-MOSFET switching with cycle-by-cycle current limiting. Use Value: Eliminates sense resistor losses and leverages 1Ω gate drivers to sustain 94% efficiency at full load - reducing fan module temperature rise by >15°C vs. diode-based solutions. |
Use Scenario: Intermediate bus conversion in telecom shelf power systems, stepping 12V or 24V input to regulated 48V for distributed power architecture. IC Role / Device Role / Timing Role: High-voltage boost controller with PGOOD monitoring and INTVCC UVLO - ensures clean power sequencing and brownout immunity. Use Value: 60V absolute max output rating and ±0.5% reference accuracy maintain tight 48V ±0.5V regulation across line/load/temperature - meeting GR-1089 Class A immunity requirements. |
| Networking Equipment | Automotive Control Systems |
Use Scenario: PoE++ midspan power sourcing equipment requiring 57V output from 36–57V input with fast transient response to port insertion events. IC Role / Device Role / Timing Role: Constant off-time current mode controller with 25MHz error amplifier - delivers <50μs recovery from 50% load steps. Use Value: Adjustable off-time (via IOFF/VOFF) maintains stable 200–300kHz switching across wide input range - avoiding audible noise and EMI band conflicts. |
Use Scenario: 12V-to-24V boost for ADAS camera modules and radar sensors operating in under-hood environments (–40°C to +125°C). IC Role / Device Role / Timing Role: Automotive-grade synchronous controller with thermal shutdown and robust gate drive - ensures continuous operation despite engine bay thermal cycling. Use Value: Exposed-pad TSSOP package and –40°C to +125°C qualification enable direct mounting on sensor PCBs - eliminating need for remote power modules and interconnect losses. |
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 |
|---|---|---|---|
| LT3757AEDD#PBF | Fixed 100kHz–1MHz frequency range; requires external current sense resistor; no VRNG pin for RDS(ON)-based sensing. | Better suited for fixed-frequency noise-sensitive designs; lacks integrated sense-threshold programming. | Choose LT3757AEDD#PBF if strict EMI compliance requires deterministic switching frequency and external sensing is acceptable. |
| TPS40210DGQ | Current-mode controller with 2.5V reference; no PGOOD output; max 55V VSW; 0.5Ω gate drivers. | Lower gate drive strength and missing PGOOD limit use in high-reliability telecom/networking systems. | Choose TPS40210DGQ for cost-sensitive industrial 24V boost where PGOOD sequencing and 60V margin are not required. |
Compared with LT3757AEDD#PBF and TPS40210DGQ, the LTC3814EFE-5#PBF uniquely combines RSENSE-less current sensing, 60V output capability, PGOOD monitoring, and thermally optimized TSSOP packaging - making it the preferred choice for high-efficiency, high-reliability 24V/48V intermediate bus applications demanding minimal BOM count and thermal headroom.
Availability
LTC3814EFE-5#PBF is available at Aetrix Electronics and suitable for 24V fan supplies, 48V telecom power supplies, and networking equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3814EFE-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 and maintains full product support, datasheets, and design tools for legacy Linear parts including the LTC3814 series.
The LTC3814 family is designed for high-efficiency, high-voltage synchronous boost conversion in telecom, industrial, and automotive applications - emphasizing RSENSE-less current sensing, fast transient response, and robust thermal performance in compact packages.
FAQ
What is the maximum output voltage supported by the LTC3814EFE-5#PBF?
The LTC3814EFE-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 60V ceiling enables use in 48V telecom and industrial bus systems without external voltage clamping.
Does the LTC3814EFE-5#PBF require an external current sense resistor?
No, the LTC3814EFE-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 setting the nominal sense voltage (60–320mV). This eliminates shunt resistor losses and simplifies layout per the Applications Information section.
What is the purpose of the EXTVCC pin on the LTC3814EFE-5#PBF?
The EXTVCC pin on the LTC3814EFE-5#PBF serves as an auxiliary supply input that, when above 4.7V, powers INTVCC via an internal LDO and disables the NDRV-controlled linear regulator. This improves efficiency in high-input-voltage applications and reduces heat dissipation in the IC's internal regulators.
How is the switching frequency programmed on the LTC3814EFE-5#PBF?
The switching frequency of the LTC3814EFE-5#PBF is programmed implicitly via the IOFF and VOFF pins: tOFF = VVOFF/IIOFF × 76pF. A resistor from VOUT to IOFF sets IIOFF, while a resistive divider from VIN to VOFF makes tOFF proportional to VIN - stabilizing frequency across input voltage changes.
What thermal considerations apply to the LTC3814EFE-5#PBF package?
The LTC3814EFE-5#PBF uses a 16-lead TSSOP with exposed pad (Pin 17 = GND), rated at θJA = 38°C/W. The exposed pad must be soldered to a PCB ground plane for effective thermal conduction; failure to do so degrades thermal performance and risks junction temperature exceeding 125°C under sustained load.
LTC3814EFE-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
LTC3814EFE-5#PBF FAQ
1.How can I place an order for LTC3814EFE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3814EFE-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 LTC3814EFE-5#PBF reliable?
The price and inventory of LTC3814EFE-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 LTC3814EFE-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3814EFE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3814EFE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3814EFE-5#PBF?
LTC3814EFE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3814EFE-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 LTC3814EFE-5#PBF?
For technical support, including LTC3814EFE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3814EFE-5#PBF requirements.
6.How does Aetrix verify that LTC3814EFE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3814EFE-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 LTC3814EFE-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3814EFE-5#PBF?
All LTC3814EFE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3814EFE-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 LTC3814EFE-5#PBF part is unused and in its original packaging.
Return procedure for LTC3814EFE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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