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Analog Devices Inc. LTC3813IG#TRPBF
- Part No.:
- LTC3813IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3813IG#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,607
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Product details
Overview
LTC3813IG#TRPBF from Analog Devices (formerly Linear Technology) is a 100V synchronous step-up DC/DC controller IC designed for high-voltage boost conversion in telecom, industrial, and automotive power supplies. It implements constant off-time peak current mode control without requiring a sense resistor, delivers ±0.5% output voltage regulation via a 0.8V internal reference, features 25MHz error amplifier bandwidth for fast transient response, and supports up to 100V output in applications such as 48V base station supplies and 24V fan supplies.
For engineers reviewing the LTC3813IG#TRPBF datasheet, LTC3813IG#TRPBF pinout, LTC3813IG#TRPBF application, or LTC3813IG#TRPBF equivalent, key selection considerations include its 100V max VOUT capability, IOFF-programmable switching frequency, dual N-channel MOSFET synchronous drive architecture, and –40°C to 125°C operating temperature range for rugged industrial deployment.
Technical Context
The LTC3813IG#TRPBF uses a constant off-time (COT) peak current mode control architecture with cycle-by-cycle current limiting, where top MOSFET on-time is set by an external IOFF current and VOFF voltage, enabling stable operation across wide VIN and load variations. Its 25MHz error amplifier enables sub-microsecond load transient recovery, and the ITH pin provides direct control of current limit threshold via voltage scaling.
It integrates dual high-current gate drivers (1.5A peak source, 1Ω pulldown RDS(ON)) for synchronous N-MOSFETs, supports external clock synchronization via SYNC pin, and includes independent INTVCC/DRVCC UVLO (6.2V/6.05V), PGOOD monitoring with ±10% window and 125μs delay, and programmable soft-start via SS pin capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Voltage | 100V - enables single-stage boost for 48V telecom and industrial HV rails |
| Feedback Reference Accuracy | ±0.5% at –40°C to 125°C - ensures tight output regulation over full temp range |
| Error Amplifier Bandwidth | 25MHz - delivers rapid line/load transient response without external compensation |
| Min Off-Time | <100ns - supports high-frequency operation even at high input-to-output ratios |
| Gate Driver Peak Current | 1.5A (TG/BG) - drives multiple parallel MOSFETs for >5A output designs |
| INTVCC UVLO Threshold | 6.05V (rising), 6.2V hysteresis - prevents premature turn-on before sufficient gate drive voltage |
| Shutdown Quiescent Current | 240μA - minimizes system standby power in battery-backed or energy-sensitive systems |
Pinout & Package
Package: 28-lead plastic SSOP (G package), RoHS-compliant, –40°C to 125°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IOFF (Pin 1) | Off-time current input | Sets one-shot timer current; resistor from VOUT determines switching frequency |
| VOFF (Pin 4) | Off-time voltage input | Adjusts on-time comparator trip point; ties to VIN divider for VIN-compensated frequency |
| VRNG (Pin 5) | Sense voltage limit set | Defines nominal current sense threshold (60–320mV) via resistive divider from INTVCC |
| PGOOD (Pin 6) | Power good open-drain output | Pulled low when VFB exits ±10% window for ≥125μs - enables system sequencing and fault signaling |
| SYNC (Pin 7) | External clock input | Phase-locks top gate edge to external clock - eliminates beat frequencies in noise-sensitive systems |
| ITH (Pin 8) | Error amp compensation / current limit threshold | Voltage (0–2.6V) sets peak inductor current; EA adjusts ITH to regulate VOUT |
| VFB (Pin 9) | Feedback input | Connects to resistor divider from VOUT; referenced to 0.8V internal precision bandgap |
| SS (Pin 11) | Soft-start input | Capacitor to ground ramps ITH threshold - controls inrush current and prevents overshoot |
| SHDN (Pin 13) | Shutdown control | <1.5V disables both MOSFETs and reduces INTVCC current to 240μA |
| UVIN (Pin 14) | Input undervoltage lockout | Resistive divider from VIN sets shutdown threshold (0.8V reference + 10% hysteresis) |
| NDRV (Pin 15) | External NMOS gate driver | Controls external pass device for INTVCC linear regulator - enables high-VIN (>15V) operation |
| EXTVCC (Pin 16) | External driver supply input | >6.7V enables internal LDO to power INTVCC/DRVCC - bypasses NDRV regulator |
| INTVCC (Pin 17) | Main IC supply | Powers all internal circuitry except gate drivers; requires ≥0.1μF local bypass to SGND |
| DRVCC (Pin 18) | Bottom gate driver supply | Supplies BG driver; tied to INTVCC by default; bypassed to BGRTN with 1μF low-ESR cap |
| BG (Pin 19) | Bottom gate driver output | Drives source of bottom N-MOSFET; swing from BGRTN to DRVCC |
| BGRTN (Pin 20) | Bottom gate return | Separate return path allows negative bias to suppress Miller-induced shoot-through |
| SENSE– (Pin 21) | Current sense negative input | Kelvin connection to bottom MOSFET source or sense resistor - enables accurate RDS(ON) sensing |
| SENSE+ (Pin 25) | Current sense positive input | Connected to SW node (for RDS(ON)) or top of sense resistor - completes current comparator path |
| SW (Pin 26) | Switch node | Connects to inductor, BOOST diode, and SENSE+; swings from ~–0.3V to VOUT |
| TG (Pin 27) | Top gate driver output | Floating driver for top N-MOSFET; powered from BOOST, returns to SW |
| BOOST (Pin 28) | Top gate driver supply | Charged via external Schottky from DRVCC; bypassed to SW with 0.1μF low-ESR cap |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Supports RDS(ON)-based current sensing using bottom MOSFET, eliminating sense resistor cost, power loss, and board space |
| Dual N-channel synchronous drive | Enables high-efficiency boost topology with discrete MOSFETs optimized for 100V VDS rating and low Qg |
| Programmable soft-start | SS pin capacitor controls ramp rate of current limit threshold - prevents output overshoot and inrush stress |
| Adjustable cycle-by-cycle current limit | VRNG pin sets nominal sense voltage (60–320mV); ITH voltage scales limit dynamically for precise peak current control |
| Synchronizable to external clock | SYNC pin accepts external clock up to 2MHz; PLL forces TG edge alignment - eliminates EMI beat frequencies |
| Output overvoltage protection | OV comparator immediately turns off TG and holds BG on during overvoltage - protects downstream loads and MOSFETs |
Applications
| 48V Telecom Power Supply | Automotive High-Voltage DC-DC |
|---|---|
Use Scenario: Generating regulated 48V from 12V vehicle battery for ADAS camera modules and radar units. IC Role / Device Role / Timing Role: Synchronous step-up controller managing dual N-MOSFET power stage with cycle-by-cycle current limiting and PGOOD sequencing. Use Value: Delivers 5A @ 48V with >92% efficiency at 24V input; 100V VOUT rating accommodates load dump transients up to 60V. |
Use Scenario: Boosting 24V rail to 100V for electric power steering motor pre-charge circuits. IC Role / Device Role / Timing Role: High-voltage controller implementing constant off-time regulation with synchronized switching to meet CISPR-25 Class 5 EMI limits. Use Value: Minimizes EMI through external clock sync; 25MHz error amp ensures <50μs recovery from 2A load steps. |
| Industrial 24V Fan Supply | Networking Equipment Mid-Rail Generator |
Use Scenario: Providing isolated 24V/3A output for server cooling fans from 12V backplane supply. IC Role / Device Role / Timing Role: Primary-side boost controller driving Si7850DP MOSFETs with programmable soft-start and UVLO hysteresis. Use Value: 240μA shutdown current extends system standby time; 28-pin SSOP fits compact thermal layouts near heatsinks. |
Use Scenario: Generating 50V intermediate bus from 48V PoE++ infrastructure for FPGA auxiliary rails. IC Role / Device Role / Timing Role: High-accuracy voltage controller using 0.8V ±0.5% reference and 25MHz EA for tight regulation under dynamic FPGA core loading. Use Value: ±10% PGOOD window with 125μs delay enables reliable power sequencing with ASICs; supports 100kHz–1MHz frequency tuning. |
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 |
|---|---|---|---|
| LTC3814IG#TRPBF | Max VOUT = 60V; lower INTVCC UVLO (4.2V); reduced gate drive voltage range (4.5–14V) | Not suitable for >60V output designs; better for 24–48V telecom where lower gate drive suffices | Select LTC3814IG#TRPBF only if VOUT ≤ 60V and lower gate drive voltage is acceptable |
| LM5122MMX/NOPB | Max VOUT = 65V; current-mode with slope compensation; integrated bootstrap diode; no VRNG pin for sense threshold scaling | Lacks programmable sense voltage range and 100V capability; requires external sense resistor | Choose LM5122MMX/NOPB for cost-sensitive 48V applications needing integrated bootstrap diode and smaller footprint |
Compared with LTC3814IG#TRPBF and LM5122MMX/NOPB, the LTC3813IG#TRPBF uniquely supports 100V output with resistorless RDS(ON) current sensing and scalable sense threshold via VRNG - making it the only option for high-reliability 48V→100V industrial boost converters requiring minimal BOM count and extended temperature operation.
Availability
LTC3813IG#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive high-voltage DC-DC systems, and industrial 24V fan supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3813IG#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 LTC3813IG#TRPBF belongs to Linear's high-voltage synchronous controller product line, engineered specifically for robust, efficient step-up conversion in harsh environments where 100V output, wide temperature operation, and resistorless current sensing are critical.
FAQ
What is the maximum output voltage supported by the LTC3813IG#TRPBF?
The LTC3813IG#TRPBF supports a maximum output voltage of 100V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This capability enables single-stage boost conversion for demanding applications like 48V telecom base station supplies and industrial HV rails. The 100V rating applies across the full –40°C to 125°C operating temperature range and is validated by design and characterization per Linear Technology documentation.
Does the LTC3813IG#TRPBF require an external current sense resistor?
No, the LTC3813IG#TRPBF does not require an external current sense resistor. It supports RDS(ON)-based current sensing using the bottom N-channel MOSFET's on-resistance, as detailed in the Applications Information section. The VRNG pin sets the nominal sense voltage (60–320mV), and SENSE+/SENSE– pins connect directly to the MOSFET drain and source for kelvin sensing - eliminating sense resistor cost, power loss, and PCB area while maintaining accurate cycle-by-cycle current limiting.
What is the operating temperature range of the LTC3813IG#TRPBF?
The LTC3813IG#TRPBF is rated for operation from –40°C to 125°C, as specified in the Order Information table for the "I" grade variant. This extended temperature range is guaranteed by design, characterization, and correlation with statistical process controls - making the LTC3813IG#TRPBF suitable for under-hood automotive, industrial control, and telecom equipment deployed in thermally demanding environments.
How is the switching frequency programmed on the LTC3813IG#TRPBF?
The switching frequency of the LTC3813IG#TRPBF is programmed via the IOFF pin (Pin 1) using an external resistor from VOUT to IOFF, which sets the one-shot timer current. Frequency can also be adjusted using the VOFF pin (Pin 4) with a resistive divider from VIN to maintain near-constant frequency across input voltage variations. Additionally, the SYNC pin (Pin 7) allows synchronization to an external clock up to 2MHz, enabling EMI reduction in noise-sensitive systems.
What protection features does the LTC3813IG#TRPBF include?
The LTC3813IG#TRPBF includes cycle-by-cycle current limiting (via VRNG and ITH), output overvoltage protection (OV comparator disables TG and holds BG on), input undervoltage lockout (UVIN pin with 0.8V reference), INTVCC undervoltage lockout (6.05V rising threshold), PGOOD monitoring with ±10% window and 125μs delay, and thermal shutdown. These protections are fully documented in the Fault Monitoring/Protection section and Electrical Characteristics tables.
LTC3813IG#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3813IG#TRPBF FAQ
1.How can I place an order for LTC3813IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3813IG#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 LTC3813IG#TRPBF reliable?
The price and inventory of LTC3813IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3813IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3813IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3813IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3813IG#TRPBF?
LTC3813IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3813IG#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 LTC3813IG#TRPBF?
For technical support, including LTC3813IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3813IG#TRPBF requirements.
6.How does Aetrix verify that LTC3813IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3813IG#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 LTC3813IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3813IG#TRPBF?
All LTC3813IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3813IG#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 LTC3813IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3813IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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