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Analog Devices Inc. LTC3813EG#TRPBF
- Part No.:
- LTC3813EG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3813EG#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,459
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Product details
Overview
LTC3813EG#TRPBF from Analog Devices (formerly Linear Technology) is a 100V synchronous step-up DC/DC controller IC that implements constant off-time peak current mode control without requiring an external sense resistor. It delivers ±0.5% output voltage regulation, supports up to 100V output, integrates dual 1Ω gate drivers, and operates with input voltages from 7V to 40V in high-efficiency telecom and industrial power supplies.
For engineers reviewing the LTC3813EG#TRPBF datasheet, LTC3813EG#TRPBF pinout, LTC3813EG#TRPBF application, or LTC3813EG#TRPBF equivalent, key selection criteria include its 100V max VOUT capability, cycle-by-cycle current limiting architecture, 25MHz error amplifier bandwidth, programmable off-time via IOFF/VOFF, and 28-pin SSOP package with negative BGRTN support for high dV/dt immunity.
Technical Context
The LTC3813EG#TRPBF uses a constant off-time (COT) current-mode control architecture where top MOSFET on-time is set by a one-shot timer driven by IOFF current and modulated by VOFF voltage, enabling stable operation across wide VIN and load ranges. Its 25MHz error amplifier enables fast line/load transient response, while the ITH pin directly controls cycle-by-cycle current limit threshold with 0–2.6V mapping.
Fault protection includes ±10% PGOOD monitoring with 125μs delay, output overvoltage shutdown (M1 off/M2 on), dual UVLO comparators (INTVCC at 6.2V, VIN via UVIN pin), and thermal shutdown. Gate drive architecture features independent TG and BG outputs with 1.5A peak source/1Ω pulldown RDS(ON), supporting floating high-side drive via BOOST and negative BGRTN for shoot-through prevention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Voltage | 100V - Enables high-voltage applications such as 48V telecom supplies and 24V fan systems without cascaded stages. |
| Feedback Accuracy | ±0.5% at 0.8V reference - Ensures tight regulation for precision 50V/5A or 100V output rails. |
| Error Amp Bandwidth | 25MHz - Delivers sub-microsecond transient response critical for server VRMs and networking equipment. |
| Min Off-Time | <100ns - Supports high-frequency operation (>1MHz) at low duty cycles required for high-step-up ratios. |
| Gate Drive Strength | 1.5A peak / 1Ω RDS(ON) - Drives multiple paralleled N-channel MOSFETs (e.g., Si7850DP) for >5A output current. |
| Operating Temp Range | –40°C to +85°C - Qualified for industrial and automotive under-hood environments per E-grade spec. |
| Shutdown Current | 240μA - Enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
Pinout & Package
The LTC3813EG#TRPBF is housed in a 28-lead plastic SSOP (G package) with exposed pad for thermal enhancement, rated for –40°C to +85°C operation. Pin functions are validated per Linear Technology's official datasheet (3813fb) and functional diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IOFF (1) | Off-time current input | Sets switching frequency via external resistor to VOUT; enables VIN-independent frequency programming. |
| VOFF (4) | Off-time voltage comparator input | Adjusts on-time proportionally to VIN using resistive divider; default thresholds at 0.7V (ground) or 2.4V (INTVCC). |
| VRNG (5) | Sense voltage limit set | Configures nominal current sense threshold from 60mV to 320mV via INTVCC divider; defaults to 95mV (ground) or 215mV (INTVCC). |
| PGOOD (6) | Open-drain power-good output | Asserts low when VFB deviates >±10% for ≥125μs; used for system sequencing and fault reporting. |
| SYNC (7) | External clock input | Enables PLL synchronization to external clock for EMI-sensitive applications; eliminates beat frequencies. |
| ITH (8) | Error amp compensation / current limit threshold | 0–2.6V input sets peak inductor current limit; direct interface for loop compensation networks. |
| VFB (9) | Feedback input | Connects to resistor divider from VOUT; internal 0.8V reference enables precise output voltage setting. |
| SS (11) | Soft-start timing capacitor | Capacitor to ground ramps ITH voltage, controlling startup inrush current and preventing overshoot. |
| SHDN (13) | Shutdown control | Pull below 1.5V to disable both MOSFETs and reduce supply current to 240μA. |
| UVIN (14) | Input undervoltage lockout input | Resistive divider from VIN sets turn-on threshold; internal 0.8V comparator provides hysteresis. |
| NDRV (15) | External NMOS gate driver | Drives gate of external pass FET to generate 10V INTVCC from high-VIN sources (e.g., 40V input). |
| EXTVCC (16) | External driver supply input | Switches internal LDO on at 6.7V; powers controller and drivers directly when ≥6.7V available. |
| INTVCC (17) | Main IC supply | 6.35–14V supply for all internal circuitry except gate drivers; bypassed with ≥0.1μF capacitor. |
| DRVCC (18) | Bottom gate driver supply | Supplies BG driver; typically tied to INTVCC; bypassed to BGRTN with 1μF low-ESR capacitor. |
| BG (19) | Bottom N-channel gate driver | Drives source-connected MOSFET; swing from BGRTN to DRVCC; supports negative BGRTN for Miller immunity. |
| BGRTN (20) | Bottom gate return | Separate return path for BG driver; allows connection to –5V rail to suppress false turn-on during high dV/dt. |
| SENSE– (21) | Current sense negative input | Kelvin-senses bottom MOSFET source or sense resistor; enables accurate RDS(ON)-based current sensing. |
| SENSE+ (25) | Current sense positive input | Connected to SW node when using RDS(ON) sensing; to top of sense resistor when using discrete shunt. |
| SW (26) | Switch node | Connects to inductor, bootstrap diode, and SENSE+; swings from ~–0.3V to VOUT; defines high-side driver return. |
| TG (27) | Top N-channel gate driver | Floating driver powered from BOOST; drives gate of high-side MOSFET; requires external bootstrap capacitor. |
| BOOST (28) | Top gate driver supply | Charged via external Schottky diode from DRVCC; bypassed to SW with 0.1μF low-ESR capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses bottom MOSFET RDS(ON) for current sensing-eliminates shunt losses and board space, improving efficiency by ~1–2% in 5A designs. |
| Dual N-channel synchronous drive | Eliminates external Schottky diode conduction loss; enables >95% efficiency at 50V/5A with Si7850DP MOSFETs. |
| Programmable soft-start (SS) | Capacitor-controlled ramp prevents inrush current and output overshoot during startup into large capacitive loads. |
| Adjustable cycle-by-cycle current limit | VRNG pin sets nominal sense voltage (60–320mV); combined with ITH voltage scaling enables precise overcurrent protection. |
| Synchronizable to external clock | SYNC pin accepts 100kHz–2MHz clocks; eliminates variable-frequency noise in sensitive RF or audio subsystems. |
| Output overvoltage protection | PGOOD asserts low and forces M1 off/M2 on within microseconds-prevents damage to downstream 100V-rated components. |
Applications
| 48V Telecom Power Supply | High-Voltage Fan Controller |
|---|---|
Use Scenario: Generating regulated 48V from 12V or 24V intermediate bus in base station power systems with strict ripple and transient requirements. IC Role / Device Role / Timing Role: Primary step-up controller managing dual N-MOSFET power stage, providing 100V headroom for hold-up and surge tolerance. Use Value: Achieves 96% peak efficiency at 48V/3A using Si7850DP MOSFETs and eliminates sense resistor losses, reducing thermal stress in compact enclosures. | Use Scenario: Driving high-speed centrifugal fans requiring 24V–48V output from 12V automotive or industrial battery inputs. IC Role / Device Role / Timing Role: Constant off-time controller delivering fast load-step response (<10μs) to maintain fan speed during rapid airflow demand changes. Use Value: 25MHz error amplifier ensures <50mV output deviation during 0→4A load steps, preventing fan stall or audible whine. |
| Networking Equipment Mid-Range Supply | Industrial Control System Auxiliary Rail |
Use Scenario: Creating isolated 36V or 50V auxiliary rails for PoE++ injectors, optical transceivers, or FPGA I/O banks in enterprise switches. IC Role / Device Role / Timing Role: High-accuracy (±0.5%) voltage regulator with PGOOD signaling for system-level power sequencing and fault isolation. Use Value: ±10% PGOOD window with 125μs delay enables reliable coordination with microcontroller reset logic and hot-swap controllers. | Use Scenario: Providing stable 28V or 36V bias for PLC analog I/O modules, motor drivers, or solenoid interfaces operating in harsh factory environments. IC Role / Device Role / Timing Role: Robust controller with dual UVLO (VIN and INTVCC), thermal shutdown, and negative BGRTN support for high-noise industrial grounding schemes. Use Value: BGRTN pin allows –2V return to suppress Miller-induced shoot-through during 1kV/μs EFT events, ensuring MOSFET reliability over 10-year field life. |
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 |
|---|---|---|---|
| LTC3783 | Fixed 200kHz–2MHz frequency range; no IOFF/VOFF programmability; requires external sense resistor. | Targeted at lower-voltage (≤60V) applications; lacks 100V VOUT capability and RDS(ON) sensing. | Select LTC3783 only if fixed-frequency operation and lower cost outweigh need for 100V output and resistorless sensing. |
| LM5122 | Wide-input (3V–65V) synchronous boost controller; 100V absolute max SW rating but 65V recommended VOUT; uses external sense resistor. | Optimized for automotive 12V/24V systems; lacks negative BGRTN, PGOOD hysteresis, and 100V guaranteed output capability. | Choose LM5122 for AEC-Q100-compliant automotive designs where 65V VOUT suffices and ISO 16750 surge immunity is required. |
Compared with LTC3813EG#TRPBF, LTC3783 offers simpler frequency setup but sacrifices 100V capability and resistorless sensing, while LM5122 provides automotive qualification and wider VIN but limits practical VOUT to 65V and omits critical industrial features like BGRTN and ±0.5% reference accuracy.
Availability
LTC3813EG#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, high-voltage fan controllers, and industrial control system auxiliary rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3813EG#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, Inc. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, communications, automotive, and aerospace markets.
The LTC3813EG#TRPBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for efficient, robust, and flexible step-up conversion in telecom, networking, and industrial power systems demanding >60V output and precise current limiting.
FAQ
What is the maximum output voltage supported by the LTC3813EG#TRPBF?
The LTC3813EG#TRPBF supports a maximum output voltage of 100V, as specified in its absolute maximum ratings and confirmed in the "Maximum VOUT" parameter table. This capability enables use in high-step-up applications such as 48V telecom supplies and 24V fan systems without cascading converters. The device maintains stability and regulation up to this voltage when properly implemented with appropriate MOSFETs and layout practices.
Does the LTC3813EG#TRPBF require an external current sense resistor?
No, the LTC3813EG#TRPBF does not require an external current sense resistor. It supports RDS(ON)-based current sensing by connecting SENSE+ to the switch node (SW) and SENSE– to the source of the bottom N-channel MOSFET. This method eliminates shunt losses and PCB area, improving efficiency-though careful MOSFET selection is required to ensure temperature-stable on-resistance across the operating range.
What package type and temperature grade does the LTC3813EG#TRPBF use?
The LTC3813EG#TRPBF uses a 28-lead plastic SSOP (G package) with lead-free finish and is rated for operation from –40°C to +85°C (E-grade). This package includes an exposed pad for enhanced thermal performance and is compatible with standard surface-mount assembly processes. The "EG" suffix explicitly denotes the commercial temperature grade and SSOP packaging.
How does the LTC3813EG#TRPBF achieve fast transient response?
The LTC3813EG#TRPBF achieves fast transient response primarily through its 25MHz error amplifier bandwidth and constant off-time current-mode architecture. The high-bandwidth amplifier enables rapid correction of output deviations, while the COT control provides inherent stability and immediate cycle-by-cycle current limiting. In typical 50V/5A applications, this results in <50mV output deviation during 0→4A load steps with sub-10μs recovery time.
Can the LTC3813EG#TRPBF be synchronized to an external clock?
Yes, the LTC3813EG#TRPBF can be synchronized to an external clock via the SYNC pin (Pin 7). It accepts input frequencies from 100kHz to 2MHz and uses an internal phase-locked loop to align the rising edge of the top-gate signal with the external clock's rising edge. This feature is essential for reducing EMI in noise-sensitive applications such as RF front-ends and high-resolution data acquisition systems.
LTC3813EG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- 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):
- 6.35V ~ 14V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3813EG#TRPBF FAQ
1.How can I place an order for LTC3813EG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3813EG#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 LTC3813EG#TRPBF reliable?
The price and inventory of LTC3813EG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3813EG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3813EG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3813EG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3813EG#TRPBF?
LTC3813EG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3813EG#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 LTC3813EG#TRPBF?
For technical support, including LTC3813EG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3813EG#TRPBF requirements.
6.How does Aetrix verify that LTC3813EG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3813EG#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 LTC3813EG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3813EG#TRPBF?
All LTC3813EG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3813EG#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 LTC3813EG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3813EG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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