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Analog Devices Inc. LTC7812EUH#TRPBF
- Part No.:
- LTC7812EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC7812EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,367
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Product details
Overview
LTC7812EUH#TRPBF from Analog Devices is a dual-channel synchronous Boost+Buck DC/DC controller driving all-N-channel MOSFETs. It integrates independent 38V boost and 24V buck regulators, 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. It enables stable 12V/8A output in automotive power systems with cold-crank resilience.
For engineers reviewing the LTC7812EUH#TRPBF datasheet, LTC7812EUH#TRPBF pinout, LTC7812EUH#TRPBF application, or LTC7812EUH#TRPBF equivalent, key selection criteria include cascaded VIN-above/below/VOUT capability, independent loop compensation for fast transient response, RSENSE or DCR current sensing, low-ripple continuous input/output currents, and QFN-32 thermal performance under industrial temperature range (–40°C to 125°C).
Technical Context
The LTC7812EUH#TRPBF implements two independent current-mode control loops: Channel 1 (buck) uses VFB1 = 0.800V reference with 95ns minimum on-time and SENSE1± differential sensing; Channel 2 (boost) uses VFB2 = 1.200V reference, 120ns minimum on-time, and SENSE2± with 170µA SENSE2+ bias current. Both channels support programmable frequency via FREQ pin or external PLL synchronization.
Its cascaded architecture eliminates pulsating input/output currents-unlike conventional buck-boost topologies-reducing EMI and output voltage ripple. The device features separate RUN1/RUN2 enable inputs, independent soft-start (TRACK/SS1 and SS2), and dual gate drivers (TG1/BG1 for buck; TG2/BG2 for boost) with sub-30ns transition times and matched dead-time control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V–38V bias supply; supports 2.5V operation after startup when biased from boost output |
| Buck Output Voltage Range | 0.8V–24V; regulated by 0.800V ±0.008V feedback reference at VFB1 |
| Boost Output Voltage Range | Up to 60V; regulated by 1.200V ±0.017V feedback reference at VFB2 |
| No-Load Quiescent Current | 33µA with both channels active; enables >100-hour battery runtime in low-power standby |
| Switching Frequency Range | 75kHz–850kHz; programmable via resistor or external clock on PLLIN/MODE pin |
| Package | 32-pin 5mm × 5mm QFN (UH); exposed pad tied to PGND for thermal and electrical integrity |
| Operating Temperature | –40°C to +125°C junction; qualified per industrial reliability standards |
Pinout & Package
32-pin 5mm × 5mm plastic QFN (UH package) with exposed PGND pad (Pin 33) requiring PCB soldering for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 (Pins 1, 30) | Switch node connections | Interface directly to buck and boost inductor outputs; high dv/dt nodes requiring tight layout and ground stitching |
| TG1, TG2 (Pins 2, 29) | Top-gate N-MOSFET drivers | Floating drivers with INTVCC-referenced swing; require bootstrap capacitors between BOOSTx and SWx |
| BG1, BG2 (Pins 31, 27) | Bottom-gate N-MOSFET drivers | Ground-referenced drivers; sink/source up to 1.5Ω pull-down for fast turn-off |
| VFB1, VFB2 (Pins 6, 14) | Feedback inputs | High-impedance (±50nA) inputs sensing divided output voltage; set regulation points at 0.800V and 1.200V respectively |
| SENSE1+, SENSE1– (Pins 7, 8) SENSE2+, SENSE2– (Pins 12, 13) | Differential current sense inputs | Support RSENSE or lossless DCR sensing; SENSE2+ supplies 170µA bias current for boost channel |
| RUN1, RUN2 (Pins 17, 19) | Independent enable inputs | 1.21V threshold with 70mV hysteresis; pulling both below 0.7V enters 10µA shutdown mode |
| PGOOD1 (Pin 3) OV2 (Pin 22) | Open-drain status outputs | PGOOD1 asserts low if VFB1 deviates >±10%; OV2 asserts low if VFB2 exceeds +10% - both support fault logging |
| INTVCC (Pin 24) EXTVCC (Pin 25) | Internal LDO output / external bias input | INTVCC = 5.4V ±0.2V; EXTVCC switchover at 4.7V enables higher-efficiency biasing from system rail |
Key Features
| Feature | Design Value |
|---|---|
| Cascaded Boost+Buck topology | Enables single-stage regulation across wide VIN ranges (VIN <, >, or = VOUT), eliminating intermediate bus stages and reducing component count |
| Independent loop compensation | Separate ITH1/ITH2 pins allow optimized transient response for each output without cross-coupling |
| Low-EMI continuous current waveforms | Non-pulsating input/output currents reduce conducted and radiated emissions versus traditional buck-boost converters |
| Multi-mode light-load operation | Burst Mode (PLLIN/MODE = GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced CCM (PLLIN/MODE = INTVCC) selectable per design requirement |
| Robust cold-crank support | Maintains regulation down to 2.5V input after startup - critical for automotive 12V systems during engine cranking |
Applications
| Automotive Infotainment Power Supply | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Powering 12V display, audio amplifier, and MCU core rails from a 9V–16V vehicle battery subject to cold-crank dips to 2.5V. IC Role / Device Role / Timing Role: Dual-output controller providing isolated 12V@8A (boost+buck cascade) and 3.3V@2A (buck-only) with independent sequencing. Use Value: Eliminates need for pre-regulator stage; maintains output regulation during 2.5V input dips; reduces EMI filtering cost by 40% vs. conventional buck-boost. | Use Scenario: Generating 24V fieldbus and 5V logic rails from unregulated 18V–36V industrial DC supply with high reliability requirements. IC Role / Device Role / Timing Role: Cascaded controller delivering 24V@3A (boost) and 5V@5A (buck) with synchronized switching to minimize beat-frequency noise. Use Value: Achieves >95% efficiency at full load; supports phase-locking to system clock for deterministic noise spectrum; meets IEC 61000-4-4 surge immunity via low-ripple operation. |
| High-Power Portable Test Equipment | Telecom Remote Radio Unit (RRU) |
Use Scenario: Battery-powered bench instrument requiring 15V analog front-end and 1.2V FPGA core rails from 2-cell Li-ion (6V–8.4V). IC Role / Device Role / Timing Role: Boost+buck controller generating 15V@2A and 1.2V@6A with ultra-low IQ (33µA) to extend runtime. Use Value: Delivers >12 hours continuous operation on 10,000mAh battery; fast transient response (<50µs) prevents FPGA brownout during burst processing. | Use Scenario: Base station RRU converting 48V backplane to 28V PA bias and 3.3V digital logic under -30°C to +70°C ambient. IC Role / Device Role / Timing Role: Industrial-grade controller regulating 28V@10A (boost) and 3.3V@4A (buck) with –40°C to +125°C junction rating. Use Value: Qualified for extended temperature operation; EXTVCC support enables direct 48V biasing to bypass VBIAS LDO losses; PGOOD1/OV2 enable real-time fault reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7813EUH#TRPBF | Same pinout and feature set; adds integrated MOSFET drivers with higher peak current (4A vs 2.5A) and lower RDS(on) for TG/BG outputs | Optimized for higher-current designs (>10A buck or >6A boost) where gate drive strength limits efficiency | Select LTC7813EUH#TRPBF when driving large gate-charge MOSFETs or operating above 500kHz switching frequency |
| MPQ4332GQ-AEC1-Z | Single-channel 36V synchronous buck controller; lacks boost stage, PLL sync, and independent loop compensation | Suitable only for step-down-only applications; requires external boost IC for VIN-above-VOUT scenarios | Choose MPQ4332GQ-AEC1-Z only for cost-sensitive, buck-only designs where cascaded topology is unnecessary |
Compared with LTC7813EUH#TRPBF, the LTC7812EUH#TRPBF offers identical control architecture and thermal footprint but trades driver strength for lower quiescent current (33µA vs 42µA), making it preferable for battery-critical systems. Versus MPQ4332GQ-AEC1-Z, the LTC7812EUH#TRPBF provides true VIN-above/below/VOUT flexibility and EMI advantages of continuous current mode - essential for automotive and industrial multi-rail systems.
Availability
LTC7812EUH#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, and high-power portable test equipment requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-aligned manufacturing traceability.
Supply support for LTC7812EUH#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 industrial, automotive, communications, and healthcare markets.
The LTC7812EUH#TRPBF belongs to the Power by Linear™ controller family, designed specifically for high-efficiency, low-EMI, wide-input-range DC/DC conversion in mission-critical automotive and industrial power systems.
FAQ
What is the minimum input voltage required for the LTC7812EUH#TRPBF to maintain regulation?
The LTC7812EUH#TRPBF sustains regulation down to 2.5V input after startup when biased from its own boost output. During initial startup, it requires ≥4.5V on the VBIAS pin. This cold-crank capability makes the LTC7812EUH#TRPBF suitable for automotive 12V systems experiencing battery dips during engine cranking. The device does not regulate below 2.5V once running.
Can the LTC7812EUH#TRPBF operate with only the buck or only the boost channel enabled?
Yes, the LTC7812EUH#TRPBF supports independent channel operation. RUN1 and RUN2 pins allow individual enable/disable control: pulling RUN1 <1.17V disables the buck channel while RUN2 remains active, and vice versa. In single-channel mode, quiescent current drops to 28µA (buck only) or 33µA (boost only), preserving battery life in partial-load configurations.
Does the LTC7812EUH#TRPBF support external synchronization of switching frequency?
Yes, the LTC7812EUH#TRPBF supports external synchronization via the PLLIN/MODE pin, accepting clock inputs from 75kHz to 850kHz. When an external clock is applied, the phase-locked loop aligns rising edges of TG1 and BG2 to the external clock's rising edge, enabling deterministic EMI reduction and multi-converter interleaving in dense power systems.
What current sensing methods are supported by the LTC7812EUH#TRPBF?
The LTC7812EUH#TRPBF supports both RSENSE shunt-based and lossless DCR current sensing on both channels. SENSE1± and SENSE2± inputs accept differential voltage signals, with maximum sense thresholds of 57mV (buck) and 50mV (boost). The boost channel's SENSE2+ pin sources 170µA bias current, simplifying DCR implementation using a single series RC network.
How is thermal performance managed in the LTC7812EUH#TRPBF QFN package?
The LTC7812EUH#TRPBF uses a 32-pin 5mm × 5mm QFN with an exposed PGND pad (Pin 33) that must be soldered to a thermally robust PCB copper area. With θJA = 44°C/W, the package delivers rated performance up to +125°C junction temperature. Proper thermal vias under the pad and connection to internal ground planes are mandatory to achieve specified efficiency and reliability.
LTC7812EUH#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC7812EUH#TRPBF FAQ
1.How can I place an order for LTC7812EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7812EUH#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 LTC7812EUH#TRPBF reliable?
The price and inventory of LTC7812EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7812EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7812EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7812EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7812EUH#TRPBF?
LTC7812EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7812EUH#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 LTC7812EUH#TRPBF?
For technical support, including LTC7812EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7812EUH#TRPBF requirements.
6.How does Aetrix verify that LTC7812EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7812EUH#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 LTC7812EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7812EUH#TRPBF?
All LTC7812EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7812EUH#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 LTC7812EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC7812EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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