My Inquiry
My Account
Analog Devices Inc. LTC7812IUH#TRPBF
- Part No.:
- LTC7812IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC7812IUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,562
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7812IUH#TRPBF from Analog Devices is a dual-channel synchronous Boost+Buck DC/DC controller IC driving all-N-channel MOSFETs, featuring independent 33 µA quiescent current (both channels active), 4.5 V to 38 V input range, and cascaded operation enabling regulated output with input voltage above, below, or equal to VOUT. It delivers 12 V/8 A in typical automotive cold-crank battery systems.
For engineers reviewing the LTC7812IUH#TRPBF datasheet, LTC7812IUH#TRPBF pinout, LTC7812IUH#TRPBF application, or LTC7812IUH#TRPBF equivalent, key selection criteria include its dual-loop compensation for fast transient response, RSENSE/DCR current sensing flexibility, phase-lockable 75–850 kHz switching frequency, and support for lossless high-efficiency operation in wide-input industrial and automotive power supplies.
Technical Context
The LTC7812IUH#TRPBF integrates two independent current-mode control loops: Channel 1 (buck) regulates 0.8 V–24 V outputs with 0.800 V feedback reference and 95 ns minimum on-time; Channel 2 (boost) regulates up to 60 V with 1.200 V reference and 120 ns minimum on-time. Both channels support programmable frequency and external synchronization via PLLIN/MODE.
It employs separate gate drivers (TG1/BG1 for buck; TG2/BG2 for boost), with dedicated SENSE+/– pins per channel, independent RUN/ITH/VFB/SS pins, and dual overvoltage protection (PGOOD1 and OV2). The device operates across –40°C to +125°C junction temperature and supports Burst Mode, pulse-skipping, and forced continuous conduction modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 38 V (bias supply); operates down to 2.5 V after startup when biased from boost output |
| Quiescent Current | 33 µA (both channels active in sleep mode) - extends battery runtime in portable and automotive systems |
| Buck Output Range | 0.8 V ≤ VOUT1 ≤ 24 V - supports logic rails, intermediate bus, and analog supply generation |
| Boost Output Range | Up to 60 V - enables LED drivers, industrial sensors, and HV bias supplies |
| Switching Frequency | 75 kHz to 850 kHz (phase-lockable) - allows EMI optimization and compact magnetics design |
| Feedback Reference | VFB1 = 0.800 V ±0.008 V (buck); VFB2 = 1.200 V ±0.014 V (boost) - ensures tight output regulation across temperature |
| Operating Temp | –40°C to +125°C (junction) - qualified for under-hood automotive and industrial environments |
Pinout & Package
32-pin 5 mm × 5 mm QFN package (UH) 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 low-side terminals; critical for layout EMI reduction |
| TG1, TG2 (Pins 2, 29) | Top-gate drivers | Floating N-channel gate drives referenced to SW nodes; require bootstrap capacitors between BOOSTx and SWx |
| BG1, BG2 (Pins 31, 27) | Bottom-gate drivers | Ground-referenced N-channel gate drives; drive synchronous rectifiers with 1.0–1.5 Ω pull-down resistance |
| SENSE1+, SENSE1– (Pins 7, 8) SENSE2+, SENSE2– (Pins 12, 13) | Differential current sense inputs | Support RSENSE or DCR sensing; enable accurate peak-current limiting and cycle-by-cycle protection |
| VFB1, VFB2 (Pins 6, 14) | Feedback inputs | High-impedance (±50 nA) inputs for resistor-divider monitoring of buck/boost outputs; set regulation points |
| RUN1, RUN2 (Pins 17, 19) | Independent enable inputs | Logic-controlled start-up with 1.21–1.27 V thresholds; allow staggered sequencing or fault isolation |
| PGOOD1, OV2 (Pins 3, 22) | Open-drain status outputs | PGOOD1 indicates buck regulation (±10%); OV2 signals boost overvoltage (>110%); both sink 2 mA |
| PLLIN/MODE (Pin 10) | Synchronization & light-load mode control | Accepts external clock (75–850 kHz) or sets operating mode: Burst, pulse-skip, or forced CCM |
Key Features
| Feature | Design Value |
|---|---|
| Independent boost + buck controllers | Enables flexible power architecture: dual-output regulation or single-output wide-VIN conversion without pulsating input/output currents |
| Low 33 µA quiescent current (both channels) | Extends battery life in always-on automotive modules (e.g., telematics, ADAS sensors) and IoT edge devices |
| Continuous input/output current waveform | Reduces EMI filter size by >50% vs. conventional buck-boost; eliminates need for large bulk input capacitors |
| Independent loop compensation (ITH1/ITH2) | Allows optimized transient response for each output-critical for mixed-signal systems with dynamic load steps |
| RSENSE or lossless DCR current sensing | Eliminates sense resistor losses in high-current applications; supports accurate current limiting without added heat |
| Phase-lockable frequency (75–850 kHz) | Enables synchronized multi-rail power systems and avoids beat frequencies in dense PCB layouts |
Applications
| Automotive Cold-Crank Power Supply | Industrial Wide-Input DC-DC Converter |
|---|---|
Use Scenario: Maintains stable 12 V rail during engine cranking where battery voltage dips to 2.5 V. IC Role / Device Role / Timing Role: LTC7812IUH#TRPBF acts as cascaded boost+buck controller, first boosting input to ~14 V then bucking to regulated 12 V. Use Value: Ensures uninterrupted operation of infotainment, ADAS ECUs, and body control modules during cranking events. | Use Scenario: Powers 24 V PLC I/O modules from unregulated 12–36 V industrial bus. IC Role / Device Role / Timing Role: LTC7812IUH#TRPBF configures buck channel for 24 V output and boost channel for auxiliary 5 V/3.3 V rails. Use Value: Single-chip solution replaces discrete boost+buck combinations, reducing BOM count and board area by 35%. |
| Battery-Powered Test Equipment | High-Efficiency LED Driver Bias Supply |
Use Scenario: Portable oscilloscope requiring ultra-low-noise 5 V and 15 V rails from 3.7 V Li-ion battery. IC Role / Device Role / Timing Role: LTC7812IUH#TRPBF operates buck channel in Burst Mode for 5 V and boost channel for 15 V with independent soft-start. Use Value: Achieves >92% efficiency at 10 mA load and extends runtime by 40% vs. linear regulators. | Use Scenario: Drives 48 V LED string from 12 V vehicle battery with dimming control. IC Role / Device Role / Timing Role: LTC7812IUH#TRPBF uses boost channel only, regulating 48 V with PWM dimming via TRACK/SS2 pin. Use Value: Delivers 60 V capability and <13% output ripple, meeting automotive LED photometric stability requirements. |
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 |
|---|---|---|---|
| LTC7813IUH#TRPBF | Same pinout and architecture but adds integrated LDO for gate driver bias; higher IQ (45 µA) | Preferred where INTVCC supply margin is limited or external LDO bypass is undesirable | Select when simplified biasing and reduced external components outweigh quiescent current penalty |
| MP2918GL-Z | Single-channel buck controller only; no boost stage; 12 V max input; 25 µA IQ | Only suitable for step-down-only applications with narrow VIN range | Choose only if system requires only buck regulation and operates strictly within 4.5–12 V input |
Compared with LTC7812IUH#TRPBF, LTC7813IUH#TRPBF offers integrated biasing at higher IQ, while MP2918GL-Z provides lower-cost buck-only control but cannot replace the cascaded Boost+Buck functionality required for wide-VIN or bidirectional VIN/VOUT relationships.
Availability
LTC7812IUH#TRPBF is available at Aetrix Electronics and suitable for automotive cold-crank systems, industrial wide-input power supplies, and battery-powered test equipment requiring stable component supply and long-term lifecycle support.
Supply support for LTC7812IUH#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 (now part of Analog Devices, Inc., following merger with Linear Technology) designs high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The LTC7812IUH#TRPBF belongs to the LTC78xx family of high-efficiency synchronous controllers, engineered specifically for wide-input, high-reliability power conversion in automotive and industrial environments where input voltage can vary significantly.
FAQ
What is the minimum input voltage for LTC7812IUH#TRPBF after startup?
The LTC7812IUH#TRPBF can operate from an input supply as low as 2.5 V after startup when biased from the output of its internal boost regulator. This capability is essential for automotive cold-crank applications where battery voltage collapses temporarily. During initial startup, however, the device requires ≥4.5 V on the VBIAS pin to power up the internal LDO and gate drivers before the boost stage becomes active.
Does LTC7812IUH#TRPBF support both RSENSE and DCR current sensing?
Yes, LTC7812IUH#TRPBF supports both RSENSE and lossless DCR current sensing on both buck and boost channels. The SENSE1+/– and SENSE2+/– pins accept differential voltage inputs, allowing direct connection to either a precision shunt resistor or the voltage drop across a power inductor's DCR. This flexibility reduces power loss and board space in high-current designs while maintaining accurate current limiting and cycle-by-cycle protection.
How does the PLLIN/MODE pin configure light-load operation for LTC7812IUH#TRPBF?
The PLLIN/MODE pin on LTC7812IUH#TRPBF determines light-load behavior: grounding it selects Burst Mode for highest light-load efficiency; tying it to INTVCC forces continuous conduction mode (CCM); applying a voltage between 1.2 V and (INTVCC − 1.3 V) enables pulse-skipping. This pin also accepts external clocks (75–850 kHz) for synchronization. All configurations apply to both buck and boost channels simultaneously.
What is the purpose of the EXTVCC pin on LTC7812IUH#TRPBF?
The EXTVCC pin on LTC7812IUH#TRPBF provides an alternative power path for the INTVCC regulator. When EXTVCC exceeds 4.7 V, the internal LDO switches from VBIAS to EXTVCC, improving efficiency and reducing thermal stress on the VBIAS LDO. This is especially beneficial in high-power designs where VBIAS current would otherwise exceed 50 mA. EXTVCC must not exceed 14 V and must be decoupled locally to PGND.
Can LTC7812IUH#TRPBF regulate outputs where input voltage crosses the output voltage level?
Yes, LTC7812IUH#TRPBF is explicitly designed for this scenario. When configured in cascaded mode-boost stage feeding buck stage-the system maintains regulation whether input voltage is above, below, or equal to the final output voltage. This eliminates the need for complex SEPIC or Ćuk topologies and avoids discontinuous input/output current waveforms that increase EMI and capacitor stress.
LTC7812IUH#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)
LTC7812IUH#TRPBF FAQ
1.How can I place an order for LTC7812IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7812IUH#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 LTC7812IUH#TRPBF reliable?
The price and inventory of LTC7812IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7812IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7812IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7812IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7812IUH#TRPBF?
LTC7812IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7812IUH#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 LTC7812IUH#TRPBF?
For technical support, including LTC7812IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7812IUH#TRPBF requirements.
6.How does Aetrix verify that LTC7812IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7812IUH#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 LTC7812IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7812IUH#TRPBF?
All LTC7812IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7812IUH#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 LTC7812IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC7812IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7812IUH#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
