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Analog Devices Inc. LTC7812HUH#TRPBF
- Part No.:
- LTC7812HUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC7812HUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,561
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Product details
Overview
LTC7812HUH#TRPBF from Analog Devices is a high-performance synchronous Boost+Buck DC/DC controller driving all-N-channel MOSFET stages. It integrates independent boost (up to 60V) and buck (0.8V–24V) controllers, operates from 4.5V–38V input (or 2.5V post-startup), delivers 33µA no-load quiescent current, and supports phase-lockable switching frequencies from 75kHz to 850kHz - enabling wide-input automotive and industrial power systems with continuous input/output currents.
For engineers reviewing the LTC7812HUH#TRPBF datasheet, LTC7812HUH#TRPBF pinout, LTC7812HUH#TRPBF application, or LTC7812HUH#TRPBF equivalent, key selection considerations include its dual-channel current-mode control architecture, RSENSE/DCR sensing flexibility, independent feedback compensation, cold-crank input dip tolerance down to 2.5V, and 32-pin 5mm × 5mm QFN package with exposed PGND pad for thermal management.
Technical Context
The LTC7812HUH#TRPBF implements two independent current-mode control loops: Channel 1 (buck) uses VFB1 = 0.800V reference with ITH1-based peak-current regulation and 95ns minimum on-time; Channel 2 (boost) uses VFB2 = 1.200V reference, 120ns minimum on-time, and BOOST2 charge pump capable of 65µA output. Both channels support programmable frequency via FREQ pin or external PLL synchronization through PLLIN/MODE.
Its cascaded topology enables VIN-above/below/equal-to-VOUT operation without pulsating input/output currents. Gate drivers feature matched rise/fall times (TG1: 25ns/16ns; BG2: 28ns/13ns), low on-resistance (TG2/BG2: 1.2Ω/1.0Ω), and precise dead-time control (70ns top-on delay in boost). UVLO thresholds are 4.15V (rising) and 3.5V (falling) on INTVCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V bias supply; supports 2.5V post-startup when biased from boost output - enables cold-crank operation in automotive systems. |
| Buck Output Range | 0.8V to 24V regulated output with 0.800V ±12mV feedback reference - supports precise low-voltage rail generation. |
| Boost Output Range | Up to 60V output with 1.200V ±18mV feedback reference - suitable for high-side LED drivers or industrial sensors. |
| Quiescent Current | 33µA (both channels active in sleep mode) - extends battery runtime in always-on applications. |
| Switching Frequency | 75kHz to 850kHz, phase-lockable via PLLIN/MODE - allows EMI reduction through spread-spectrum or fixed-frequency synchronization. |
| Package | 32-pin 5mm × 5mm QFN with exposed PGND pad - provides low thermal resistance (θJA = 44°C/W) and robust grounding for high-current gate drives. |
| Operating Temperature | –40°C to +150°C junction range (H-grade) - qualified for under-hood automotive and harsh industrial environments. |
Pinout & Package
32-pin 5mm × 5mm plastic QFN (UH package) with exposed PGND pad (Pin 33), requiring soldering to PCB for thermal and electrical performance. Pin numbering follows standard top-view layout with SGND on Pins 16, 18, 20, 21; RUN1/RUN2 on Pins 17/19; and dedicated BOOST1/BOOST2 (Pins 32/28) for floating gate drive supplies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 1) | Buck switch node | Connects to buck inductor and bottom MOSFET source; carries high di/dt buck switching current. |
| TG1 (Pin 2) | Buck top-gate driver output | Floating N-channel gate drive referenced to SW1; 2.5Ω pull-up / 1.5Ω pull-down for fast MOSFET turn-on/off. |
| PGOOD1 (Pin 3) | Buck power-good indicator | Open-drain output asserting low when VFB1 deviates >±10% from 0.8V - enables system sequencing and fault reporting. |
| TRACK/SS1 (Pin 4) | Buck soft-start/tracking input | 5µA internal pull-up; capacitor to ground sets ramp time; resistor divider enables output voltage tracking during startup. |
| ITH1 (Pin 5) | Buck error amplifier output | Compensation node setting peak current limit; voltage directly controls current comparator trip point in buck loop. |
| VFB1 (Pin 6) | Buck feedback input | High-impedance input sensing resistive divider output; regulates to 0.800V reference with ±12mV accuracy over temperature. |
| SENSE1+ (Pin 7) | Buck current sense (+) | Differential input for RSENSE or DCR sensing; supplies current to comparator when used with lossless sensing. |
| SENSE1– (Pin 8) | Buck current sense (–) | Differential input; sources/sinks current depending on VOUT vs INTVCC relationship - enables accurate current foldback. |
Key Features
| Feature | Design Value |
|---|---|
| Independent boost + buck control loops | Enables dual-output regulation or seamless buck-boost operation across wide VIN/VOUT ratios without input/output current discontinuity. |
| Low 33µA quiescent current (both channels) | Extends battery life in always-on telematics, ADAS, or IoT edge nodes where standby power is critical. |
| RSENSE or lossless DCR current sensing | Supports high-efficiency designs using copper trace or inductor DCR, eliminating sense resistor losses and board space. |
| Phase-lockable 75kHz–850kHz frequency | Allows EMI compliance via synchronization to system clock or noise-sensitive band avoidance in multi-rail power systems. |
| Input dip immunity down to 2.5V | Maintains regulation during automotive cold-crank events, preventing microcontroller brownouts or sensor dropout. |
| 150°C H-grade qualification | Guarantees full electrical performance in under-hood, motor-control, or industrial enclosures without derating. |
Applications
| Automotive Power Management | Industrial Wide-Input DC-DC |
|---|---|
Use Scenario: 12V battery-powered ADAS camera module requiring stable 5V and 3.3V rails despite engine cranking dips to 2.5V. IC Role / Device Role / Timing Role: LTC7812HUH#TRPBF acts as primary cascaded boost+buck controller, regulating both outputs while maintaining continuous current delivery during transients. Use Value: Eliminates need for separate pre-regulator and post-regulator ICs, reducing BOM count and improving transient response versus conventional buck-boost converters. | Use Scenario: Factory automation PLC with 24V nominal input but subject to 18–36V field variations, powering 15V analog sensors and 5V digital logic. IC Role / Device Role / Timing Role: LTC7812HUH#TRPBF serves as dual-output controller generating 15V (buck) and 5V (boost-derived) from same input, with independent loop compensation. Use Value: Enables single-chip solution for mismatched input/output requirements, minimizing footprint and simplifying thermal design in space-constrained DIN-rail modules. |
| High-Power Battery Systems | Test & Measurement Equipment |
Use Scenario: Portable Li-ion battery pack (10–28V) powering 12V motor drivers and 3.3V MCU, requiring >8A output with minimal heat generation. IC Role / Device Role / Timing Role: LTC7812HUH#TRPBF configures buck channel for 12V/8A output and boost channel for auxiliary 3.3V rail, leveraging low-RDS(on) gate drivers. Use Value: Achieves >95% efficiency at full load while maintaining <33µA quiescent draw in sleep mode - extending operational runtime between charges. | Use Scenario: Bench power supply with programmable 5–24V output and 0–3A current limit, needing precise voltage regulation and fast load-step response. IC Role / Device Role / Timing Role: LTC7812HUH#TRPBF operates in buck configuration with external DAC-controlled TRACK/SS1 input for programmable output voltage. Use Value: Delivers <1% load regulation and <200µs recovery from 50% load steps - meeting lab-grade stability requirements without external op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost+buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7813HUH#TRPBF | Same pinout and package; adds integrated MOSFET drivers with higher current capability (TG2/BG2: 1.0Ω/0.8Ω) and extended frequency range (50kHz–1MHz). | Preferred for higher-current (>10A) or higher-frequency (>850kHz) designs where gate drive strength and bandwidth are limiting. | Select LTC7813HUH#TRPBF when driving larger MOSFETs or requiring tighter EMI control via higher switching frequencies. |
| MPQ4333GL-AEC1-Z | Monolithic dual-channel buck-boost converter (not controller); integrates power MOSFETs; max 36V input; fixed 5V/3.3V outputs only. | Suitable for cost-sensitive, lower-power (<3A) automotive applications where integration outweighs flexibility. | Choose MPQ4333GL-AEC1-Z only for fixed-output, lower-complexity designs where external FET selection and loop tuning are unnecessary. |
Compared with LTC7813HUH#TRPBF, the LTC7812HUH#TRPBF offers identical thermal rating and control flexibility but lower gate drive strength and narrower frequency range; versus MPQ4333GL-AEC1-Z, it provides full external FET control, wider output adjustability, and superior transient performance at the cost of higher design complexity.
Availability
LTC7812HUH#TRPBF is available at Aetrix Electronics and suitable for automotive power management, industrial wide-input DC-DC conversion, and high-power battery-operated systems requiring stable component supply, long-term lifecycle support, and guaranteed 150°C operation.
Supply support for LTC7812HUH#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LTC7812HUH#TRPBF belongs to the Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive and industrial applications requiring wide input ranges, ultra-low quiescent current, and robust thermal performance.
FAQ
What is the maximum boost output voltage supported by the LTC7812HUH#TRPBF?
The LTC7812HUH#TRPBF supports a maximum boost output voltage of 60V, as specified in the Electrical Characteristics table under "VOUT2 Boost Regulated Output Voltage Set Point." This rating applies when using appropriate external components (e.g., high-voltage MOSFETs, boost diode, and output capacitor) and observing absolute maximum ratings for BOOST2 (–0.3V to 76V) and SW2 (–5V to 70V). The LTC7812HUH#TRPBF achieves this using its dedicated boost channel with 1.200V feedback reference and BOOST2 charge pump.
Does the LTC7812HUH#TRPBF support synchronization to an external clock?
Yes, the LTC7812HUH#TRPBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock signal is applied, the internal phase-locked loop synchronizes the rising edges of TG1 and BG2 to the external clock's rising edge, and forces both controllers into forced continuous conduction mode. The device accepts input frequencies from 75kHz to 850kHz, as confirmed in the Electrical Characteristics table under "Synchronizable Frequency." This capability is fully implemented in the LTC7812HUH#TRPBF.
What is the operating temperature range for the LTC7812HUH#TRPBF?
The LTC7812HUH#TRPBF is rated for an operating junction temperature range of –40°C to +150°C, as explicitly stated in the Order Information table under "LTC7812HUH#PBF / LTC7812HUH#TRPBF" and confirmed in the Absolute Maximum Ratings section. This H-grade qualification ensures full parametric performance across the full range without derating, making it suitable for under-hood automotive and high-temperature industrial applications. The LTC7812HUH#TRPBF's thermal design leverages the exposed PGND pad for effective heat dissipation.
Can the LTC7812HUH#TRPBF operate with input voltages below 4.5V?
Yes, the LTC7812HUH#TRPBF can operate with input voltages as low as 2.5V after startup when biased from the output of its own boost regulator - a capability clearly documented in the Description section: "When biased from the output of the boost regulator, the LTC7812 can operate from an input supply as low as 2.5V after start-up." However, the main VBIAS supply must remain within 4.5V–38V during initial startup. This feature enables cold-crank resilience in automotive applications. The LTC7812HUH#TRPBF maintains regulation throughout such dips.
How does the LTC7812HUH#TRPBF achieve low EMI compared to conventional buck-boost regulators?
The LTC7812HUH#TRPBF achieves low EMI by implementing a cascaded Boost+Buck topology that delivers continuous, non-pulsating input and output currents - unlike conventional four-switch buck-boost regulators that produce discontinuous current waveforms. This inherent current continuity significantly reduces voltage ripple and high-frequency harmonic content. Additional EMI mitigation features include phase-lockable frequency (enabling spread-spectrum or synchronized switching), independent loop compensation for optimized transient response, and low-noise gate drivers with controlled slew rates. These characteristics are intrinsic to the LTC7812HUH#TRPBF architecture.
LTC7812HUH#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 ~ 38V
- Frequency - Switching:
- 115kHz ~ 835kHz, 350kHz ~ 535kHz
- Duty Cycle (Max):
- 96%, 99%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC7812HUH#TRPBF FAQ
1.How can I place an order for LTC7812HUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7812HUH#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 LTC7812HUH#TRPBF reliable?
The price and inventory of LTC7812HUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7812HUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7812HUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7812HUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7812HUH#TRPBF?
LTC7812HUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7812HUH#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 LTC7812HUH#TRPBF?
For technical support, including LTC7812HUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7812HUH#TRPBF requirements.
6.How does Aetrix verify that LTC7812HUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7812HUH#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 LTC7812HUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7812HUH#TRPBF?
All LTC7812HUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7812HUH#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 LTC7812HUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC7812HUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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