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Analog Devices Inc. LTC7813IUH#TRPBF
- Part No.:
- LTC7813IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC7813IUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST
- Quantity:
- Payment:
- Shipping:
Inventory:4,761
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Product details
Overview
LTC7813IUH#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous Boost+Buck DC/DC controller driving all-N-channel MOSFET stages. It delivers independent 4.5V–60V input operation, 0.8V–60V buck output and up to 60V boost output, with 34µA quiescent current (both channels active), enabling high-efficiency power conversion in automotive cold-crank and wide-input battery systems.
For engineers reviewing the LTC7813IUH#TRPBF datasheet, LTC7813IUH#TRPBF pinout, LTC7813IUH#TRPBF application, or LTC7813IUH#TRPBF equivalent, key selection criteria include cascaded VIN-above/below/equal-VOUT capability, OPTI-DRIVE gate voltage programmability (5V–10V), phase-lockable 75kHz–850kHz switching frequency, RSENSE/DCR current sensing, and robust 2.2V start-up support after bias initialization.
Technical Context
The LTC7813IUH#TRPBF integrates two fully independent control loops: a boost controller (Channel 2) regulating VOUT2 up to 60V using SENSE2+/– differential sensing and VFB2 feedback, and a buck controller (Channel 1) regulating VOUT1 from 0.8V to 60V via VFB1 and SENSE1+/–. Each channel features dedicated ITH compensation nodes, adjustable current limit thresholds (via ILIM pin), and soft-start (TRACK/SS1, SS2) with internal 10µA pull-up.
Its cascaded architecture enables continuous input/output currents-unlike conventional buck-boost topologies-reducing EMI and ripple. The device supports forced continuous, pulse-skipping, and Burst Mode® operation selected via PLLIN/MODE, with independent RUN1/RUN2 enable control and PGOOD1 open-drain status flag for the buck output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V bias supply; operates down to 2.2V after start-up when biased from boost output |
| Buck Output Range | 0.8V ≤ VOUT1 ≤ 60V; regulated by VFB1 = 0.800V ±1.2% over temperature |
| Boost Output Range | VOUT2 ≤ 60V; VFB2 = 1.200V (VPRG2 = 0V) or fixed 10V/12V (VPRG2 = FLOAT/INTVCC) |
| Quiescent Current | 34µA (both channels active, sleep mode); enables >100-hour runtime in 100µA-load battery systems |
| Switching Frequency | 75kHz–850kHz; programmable via FREQ resistor or synchronizable via PLLIN/MODE external clock |
| Gate Drive Voltage | 5V–10V programmable (OPTI-DRIVE) via DRVSET pin; supports low-RDS(on) MOSFETs with fast 25ns rise/fall times |
| Current Sensing | RSENSE or lossless DCR sensing; max sense threshold selectable as 43mV/75mV/90mV via ILIM pin state |
Pinout & Package
32-pin 5mm × 5mm QFN package (UH) with exposed thermal pad (Pin 33) soldered to PCB ground for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 (1, 30) | Switch node connections | Direct connection points to buck and boost inductor switches; require low-inductance layout to minimize ringing |
| TG1, TG2 (2, 29) | Top-gate drivers | Floating N-channel gate drives referenced to SW nodes; swing = DRVCC above SW voltage |
| BG1, BG2 (31, 27) | Bottom-gate drivers | Ground-referenced N-channel gate drives; swing = 0V to DRVCC |
| VFB1, VFB2 (6, 19) | Buck/boost feedback inputs | High-impedance inputs (±50nA/±7µA) sensing resistive divider outputs; set regulation points at 0.800V / 1.200V |
| SENSE1+, SENSE1– (7, 8) SENSE2+, SENSE2– (12, 13) | Differential current sense inputs | Enable accurate peak-current-mode control; SENSE2+ supplies current to comparator; SENSE1– sources current when > INTVCC |
| RUN1, RUN2 (16, 17) | Channel enable inputs | Logic-level shutdown: <1.22V disables respective channel; both <0.7V forces full shutdown (3.6µA IQ) |
| PLLIN/MODE (10) | Synchronization & light-load mode select | Accepts external clock for synchronization; selects Burst Mode®, pulse-skipping, or forced continuous based on voltage level |
| PGOOD1 (14) | Buck output status flag | Open-drain output pulled low when VFB1 deviates >±10% from target; enables system sequencing and fault reporting |
Key Features
| Feature | Design Value |
|---|---|
| Cascaded Boost+Buck topology | Enables continuous input/output current flow-reducing EMI by >15dB and eliminating pulsating ripple seen in 4-switch buck-boost converters |
| Independent loop compensation | Dedicated ITH1/ITH2 pins allow separate bandwidth and phase-margin tuning for buck and boost stages without interaction |
| OPTI-DRIVE gate voltage control | DRVSET pin configures DRVCC from 5V to 10V, optimizing gate drive strength for diverse MOSFET RDS(on) and Qg requirements |
| 2.2V start-up capability | After initial bias from boost output, regulator sustains operation during automotive cold-crank events where input dips below 4.5V |
| Three-level current limit programming | ILIM pin (GND/FLOAT/INTVCC) sets max sense threshold to 43mV/75mV/90mV-matching low-side RSENSE or DCR values across load ranges |
Applications
| Automotive Infotainment Power Supply | Industrial Wide-Input DC-DC Converter |
|---|---|
Use Scenario: Powering 12V display backlight and 5V MCU core from variable 6V–16V vehicle battery with cold-crank resilience. IC Role / Device Role / Timing Role: LTC7813IUH#TRPBF acts as dual-output controller-boosting to 12V for LED driver and bucking to 5V for logic-cascaded to maintain regulation during 2.2V dips. Use Value: Eliminates need for pre-regulator; 34µA IQ extends always-on system battery life; PGOOD1 enables safe MCU reset during undervoltage. | Use Scenario: Converting unregulated 24V–60V factory bus to stable 15V actuator rail and 3.3V sensor supply in PLC backplane. IC Role / Device Role / Timing Role: LTC7813IUH#TRPBF implements isolated dual-rail generation with independent feedback loops-enabling precise 0.8% VOUT accuracy and fast transient response (<50µs). Use Value: Cascaded architecture reduces input filter size by 40%; phase-lockable frequency avoids noise coupling into analog signal chains. |
| Battery-Powered Test Equipment | High-Power PoE++ Midspan |
Use Scenario: Portable oscilloscope requiring 24V analog front-end rail and 1.2V FPGA core voltage from 2S–3S Li-ion (6V–12.6V). IC Role / Device Role / Timing Role: LTC7813IUH#TRPBF operates in boost+buck cascade: boosting to 24V then bucking to 1.2V, with TRACK/SS1 enabling controlled power-up sequencing. Use Value: 29µA single-channel IQ enables >200-hour standby; RSENSE sensing ensures ±3% current limit accuracy across temperature. | Use Scenario: Midspan PoE++ injector delivering 90W to endpoint while deriving auxiliary 12V/5V rails from 57V PSE input. IC Role / Device Role / Timing Role: LTC7813IUH#TRPBF regulates 12V auxiliary rail (buck) and 5V management rail (boost from 12V), leveraging EXTVCC switchover for efficiency at high load. Use Value: Dual independent controllers avoid cross-regulation; 75kHz–850kHz programmability allows EMI filtering at 150kHz for EN55022 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-stage DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7810IUH#TRPBF | Single-channel buck controller only; no boost stage; 4.5V–40V input; 30µA IQ | Cannot replace LTC7813IUH#TRPBF in boost+buck or VIN-above/below-VOUT applications | Select only if system requires only buck regulation with tighter input range and lower cost |
| MPQ4332GR-A | Integrated dual-channel buck controller (no boost); 3.3V–36V input; 25µA IQ; 2.5MHz max fSW | Lacks VIN-above-VOUT capability and cascaded topology; unsuitable for cold-crank or wide-VIN industrial use | Consider for space-constrained 12V–24V systems needing high-frequency operation but no boost functionality |
Compared with LTC7810IUH#TRPBF and MPQ4332GR-A, the LTC7813IUH#TRPBF uniquely supports true buck-boost voltage conversion through cascaded topology, maintains regulation during 2.2V input dips, and provides independent loop optimization-making it irreplaceable in automotive and wide-input industrial power designs.
Availability
LTC7813IUH#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power supplies, and battery-powered test equipment requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term lifecycle continuity.
Supply support for LTC7813IUH#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, inheriting its high-performance analog and power management portfolio. The company specializes in precision signal chain and power solutions for demanding applications.
The LTC7813IUH#TRPBF belongs to the LTC78xx family of high-voltage multi-phase controllers, designed specifically for wide-input, high-reliability power conversion in automotive, industrial, and aerospace systems where input transients and efficiency under light load are critical.
FAQ
What is the minimum input voltage required for startup of the LTC7813IUH#TRPBF?
The LTC7813IUH#TRPBF requires a minimum 4.5V bias supply on VBIAS to initiate startup. Once the boost stage begins operating, it can sustain regulation with input as low as 2.2V by biasing the controller from the boost output rail-critical for automotive cold-crank scenarios where battery voltage collapses temporarily.
How does the LTC7813IUH#TRPBF achieve reduced EMI compared to conventional buck-boost regulators?
The LTC7813IUH#TRPBF uses a cascaded Boost+Buck architecture instead of a 4-switch buck-boost topology, resulting in continuous (non-pulsating) input and output currents. This eliminates high di/dt discontinuities that generate broadband EMI, reducing conducted emissions by up to 15dB and easing compliance with CISPR 25 Class 5 requirements in automotive designs.
Can the LTC7813IUH#TRPBF regulate both outputs simultaneously when VIN is below, above, or equal to the final VOUT?
Yes-the LTC7813IUH#TRPBF supports all three configurations by cascading its boost and buck stages: boost first (if VIN < VOUT), then buck (if intermediate voltage > VOUT); buck first (if VIN > VOUT), then boost (if intermediate < VOUT); or direct pass-through (if VIN ≈ VOUT). This enables single-controller solution for variable-input systems like solar charge controllers or wide-range industrial supplies.
What are the supported current sensing methods for the LTC7813IUH#TRPBF?
The LTC7813IUH#TRPBF supports both discrete RSENSE and lossless DCR current sensing on both channels. SENSE1+/– and SENSE2+/– accept differential inputs; SENSE2+ actively sources current to the comparator, while SENSE1– sources current when voltage exceeds INTVCC. Thresholds are configurable via ILIM pin (43mV/75mV/90mV) to match sense element sensitivity.
Does the LTC7813IUH#TRPBF provide output voltage tracking during startup?
Yes-the LTC7813IUH#TRPBF supports output voltage tracking via the TRACK/SS1 pin on the buck channel. By connecting a resistor divider from an external reference to TRACK/SS1, the buck output ramps proportionally to that reference during startup, ensuring controlled power sequencing between multiple rails-essential for FPGAs, ADCs, and mixed-signal SoCs.
LTC7813IUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 60V
- Frequency - Switching:
- 105kHz ~ 835kHz, 350kHz ~ 535kHz
- Duty Cycle (Max):
- 96%, 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC7813IUH#TRPBF FAQ
1.How can I place an order for LTC7813IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7813IUH#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 LTC7813IUH#TRPBF reliable?
The price and inventory of LTC7813IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7813IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7813IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7813IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7813IUH#TRPBF?
LTC7813IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7813IUH#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 LTC7813IUH#TRPBF?
For technical support, including LTC7813IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7813IUH#TRPBF requirements.
6.How does Aetrix verify that LTC7813IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7813IUH#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 LTC7813IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7813IUH#TRPBF?
All LTC7813IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7813IUH#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 LTC7813IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC7813IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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