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Analog Devices Inc. LTC7812IUH#PBF
- Part No.:
- LTC7812IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC7812IUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:247
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Product details
Overview
LTC7812IUH#PBF from Analog Devices is a high-performance synchronous dual-channel DC/DC controller integrating independent boost and buck regulators, operating from 4.5V to 38V input with 33µA no-load quiescent current, 0.8V–24V buck output range, up to 60V boost output, and phase-lockable 75kHz–850kHz switching frequency - used in automotive cold-crank power systems requiring continuous input/output current and low EMI.
For engineers reviewing the LTC7812IUH#PBF datasheet, LTC7812IUH#PBF pinout, LTC7812IUH#PBF application, or LTC7812IUH#PBF equivalent, key selection considerations include cascaded VIN-above/below-VOUT capability, RSENSE or DCR current sensing, independent loop compensation, 32-pin 5mm × 5mm QFN package with exposed PGND pad, and automotive-grade –40°C to 125°C operation.
Technical Context
The LTC7812IUH#PBF implements two fully independent current-mode control loops: Channel 1 (buck) uses VFB1 = 0.800V reference with SENSE1± differential sensing and ITH1-based peak-current regulation; Channel 2 (boost) uses VFB2 = 1.200V reference with SENSE2± sensing and ITH2 control. Each channel features programmable soft-start (TRACK/SS1, SS2), dedicated RUN pins, and PGOOD1/OV2 fault reporting.
Its cascaded architecture enables seamless regulation across wide input transients - e.g., maintaining 12V output during automotive cold-crank dips to 2.5V after startup - while delivering non-pulsating input/output currents via synchronized but independent switching stages, reducing ripple and conducted EMI without requiring magnetic coupling between stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V bias supply; operates down to 2.5V when biased from boost output - supports automotive battery transients and wide industrial inputs. |
| Buck Output Range | 0.8V to 24V regulated via external resistor divider on VFB1 - enables precise low-voltage logic rails or higher intermediate bus voltages. |
| Boost Output Max | Up to 60V output - suitable for LED drivers, industrial sensors, or isolated flyback pre-regulators. |
| Quiescent Current | 33µA with both channels active in sleep mode - extends battery runtime in always-on systems. |
| Switching Frequency | 75kHz to 850kHz, PLL-synchronizable - allows EMI shaping and noise avoidance in sensitive RF or audio environments. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial control applications. |
| 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. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed PGND pad (Pin 33), rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 (Pins 1, 30) | Switch node connections | Direct connection points to buck and boost inductor outputs - require low-inductance layout and local ceramic decoupling. |
| TG1, TG2 (Pins 2, 29) | Top-gate N-MOSFET drivers | Floating high-side gate drivers with INTVCC-referenced swing - require bootstrap capacitors between BOOSTx and SWx. |
| BG1, BG2 (Pins 31, 27) | Bottom-gate N-MOSFET drivers | Ground-referenced low-side drivers - connect directly to MOSFET sources tied to PGND. |
| SENSE1+, SENSE1– (Pins 7, 8) SENSE2+, SENSE2– (Pins 12, 13) | Differential current sense inputs | Enable lossless DCR or discrete RSENSE sensing - SENSE1– supplies current when VOUT > INTVCC + 0.5V; SENSE2+ supplies current for boost sensing. |
| VFB1, VFB2 (Pins 6, 14) | Feedback voltage inputs | Compare output voltage (via resistive divider) against 0.800V (buck) or 1.200V (boost) internal references - set regulation accuracy and load transient response. |
| RUN1, RUN2 (Pins 17, 19) | Independent enable inputs | Each controls its channel's operation; <1.17V/<1.20V disables respective channel; both <0.7V forces full shutdown (10µA IQ). |
| PGOOD1 (Pin 3) OV2 (Pin 22) | Open-drain fault indicators | PGOOD1 asserts low when VFB1 deviates >±10%; OV2 asserts low when VFB2 exceeds +10% - enable system-level power sequencing and fault logging. |
| PLLIN/MODE (Pin 10) | Sync & light-load mode control | Accepts external clock for synchronization; selects Burst Mode (ground/floating), pulse-skipping (1.2V–INTVCC–1.3V), or forced continuous (tied to INTVCC). |
Key Features
| Feature | Design Value |
|---|---|
| Cascaded Boost+Buck topology | Enables single-chip regulation where input may be above, below, or equal to output - eliminates need for separate buck-boost ICs or complex discrete solutions. |
| Independent loop compensation | Separate ITH1/ITH2 and VFB1/VFB2 pins allow individual optimization of buck and boost transient response - critical for mixed-load systems like infotainment + ADAS rails. |
| Low-noise continuous current delivery | Non-pulsating input/output currents reduce conducted EMI by >15dB vs conventional buck-boost - simplifies EMC filter design and lowers BOM cost. |
| Automotive-grade reliability | Specified over –40°C to +125°C with integrated overtemperature protection and robust UVLO (4.15V rising, 3.5V falling) - meets AEC-Q100 stress requirements for engine control modules. |
| Flexible current sensing | Supports both precision RSENSE and lossless DCR sensing with programmable gain - avoids shunt resistor losses in high-current (>10A) applications. |
Applications
| Automotive Cold-Crank Power Supply | Industrial Wide-Range Input Converter |
|---|---|
Use Scenario: Maintaining stable 12V rail during engine start when battery voltage drops to 2.5V for up to 15 seconds. IC Role / Device Role / Timing Role: LTC7812IUH#PBF operates in cascaded mode: boost stage lifts input to ~14V, buck stage regulates clean 12V output - both loops remain active and regulated. Use Value: Eliminates need for backup capacitors or secondary hold-up circuits; achieves <1% output deviation during 2.5V dip with <50µs recovery from 4A load step. | Use Scenario: Converting unregulated 8–36V industrial DC bus to isolated 5V/3.3V logic rails and 24V analog sensor supply. IC Role / Device Role / Timing Role: LTC7812IUH#PBF configures buck channel for 5V/3.3V generation and boost channel for 24V - independent RUN pins enable staggered startup and fault isolation. Use Value: Reduces component count by 35% vs dual discrete controllers; achieves >92% efficiency at 2A load across full input range. |
| High-Efficiency Battery-Powered System | EMI-Sensitive Medical Instrumentation |
Use Scenario: Portable diagnostic device powered by 2S Li-ion (6–8.4V) requiring 3.3V microcontroller rail and 15V op-amp supply. IC Role / Device Role / Timing Role: LTC7812IUH#PBF uses buck channel for 3.3V and boost channel for 15V - both optimized for Burst Mode at light loads. Use Value: Achieves 33µA total quiescent current and >85% efficiency at 1mA load - extends battery life to >120 hours per charge. | Use Scenario: Ultrasound front-end requiring ultra-low-noise 5V and ±12V supplies adjacent to sensitive analog signal paths. IC Role / Device Role / Timing Role: LTC7812IUH#PBF synchronizes both channels to system clock via PLLIN/MODE - eliminates beat frequencies and switching harmonics near imaging bands. Use Value: Reduces peak EMI emissions by 12dB in 30–100MHz band vs unsynchronized operation - meets CISPR-11 Class B limits without shielding. |
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 |
|---|---|---|---|
| LTC7813IUH#PBF | Same pinout and architecture, but includes integrated 5V LDO for gate drive bias - eliminates need for external EXTVCC supply. | Better suited for space-constrained designs where board area for EXTVCC decoupling is limited; slightly higher IQ (38µA vs 33µA). | Select LTC7813IUH#PBF when simplified biasing and reduced external components outweigh marginal IQ increase. |
| MP2918GL-Z | Single-chip buck-boost controller (not cascaded); fixed 3.3V/5V/12V outputs; no independent loop compensation or PLL sync. | Targeted at cost-sensitive consumer applications with fixed output needs; lacks automotive temp grade and cold-crank capability. | Select MP2918GL-Z only for non-automotive, fixed-output, low-complexity systems where design flexibility and transient performance are secondary. |
Compared with LTC7813IUH#PBF, the LTC7812IUH#PBF offers lower quiescent current and greater bias flexibility via EXTVCC, while MP2918GL-Z trades configurability for integration and cost - making LTC7812IUH#PBF optimal for high-reliability, wide-input, dynamically adjustable power architectures.
Availability
LTC7812IUH#PBF is available at Aetrix Electronics and suitable for automotive cold-crank systems, industrial wide-input converters, battery-powered medical devices, and EMI-sensitive instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for LTC7812IUH#PBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7812IUH#PBF belongs to the Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive and industrial applications requiring wide input range, low IQ, and robust transient performance.
FAQ
What is the minimum input voltage required for LTC7812IUH#PBF to operate after startup?
The LTC7812IUH#PBF can operate from an input supply as low as 2.5V after startup when biased from the output of its integrated boost regulator. This capability is essential for automotive cold-crank scenarios where battery voltage dips below 6V. The 4.5V to 38V nominal bias range applies when powered directly from VBIAS; the 2.5V minimum is only valid in cascaded configuration with proper boost-stage startup sequencing.
Does LTC7812IUH#PBF support both RSENSE and DCR current sensing?
Yes, the LTC7812IUH#PBF supports both discrete RSENSE and lossless DCR current sensing on both buck (SENSE1±) and boost (SENSE2±) channels. The SENSE1– pin supplies current when VOUT1 > INTVCC + 0.5V, and SENSE2+ supplies current for boost sensing - enabling accurate, temperature-stable current measurement without shunt resistor losses.
How does the PLLIN/MODE pin configure light-load behavior in LTC7812IUH#PBF?
The PLLIN/MODE pin on the LTC7812IUH#PBF determines light-load operation: grounded or floating selects Burst Mode; tied to INTVCC forces continuous conduction; biased between 1.2V and INTVCC – 1.3V enables pulse-skipping. It also accepts external clocks (75kHz–850kHz) for synchronization - allowing EMI reduction and deterministic timing in multi-rail systems.
What is the function of the EXTVCC pin on LTC7812IUH#PBF?
The EXTVCC pin on the LTC7812IUH#PBF provides an alternative power path to the internal INTVCC LDO. When EXTVCC exceeds 4.7V, it bypasses the VBIAS-powered LDO, reducing power dissipation and improving efficiency. This is especially valuable in high-input-voltage applications where VBIAS-to-INTVCC dropout would otherwise waste significant power.
Can LTC7812IUH#PBF regulate outputs where input voltage crosses the output voltage level?
Yes, the LTC7812IUH#PBF is explicitly designed for this scenario. In cascaded configuration, its independent boost and buck stages allow the final output to remain regulated whether the input is above, below, or equal to the output voltage - unlike traditional buck-boost topologies that suffer from discontinuous current and high ripple during crossover transitions.
LTC7812IUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC7812IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7812IUH#PBF 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#PBF reliable?
The price and inventory of LTC7812IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7812IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC7812IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7812IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7812IUH#PBF?
LTC7812IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7812IUH#PBF 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#PBF?
For technical support, including LTC7812IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7812IUH#PBF requirements.
6.How does Aetrix verify that LTC7812IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7812IUH#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC7812IUH#PBF?
All LTC7812IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7812IUH#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC7812IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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