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Analog Devices Inc. LTC7812EUH#PBF
- Part No.:
- LTC7812EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC7812EUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,792
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Product details
Overview
LTC7812EUH#PBF 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 enables continuous-input/output-current regulation for automotive cold-crank and wide-input industrial power systems.
For engineers reviewing the LTC7812EUH#PBF datasheet, LTC7812EUH#PBF pinout, LTC7812EUH#PBF application, or LTC7812EUH#PBF equivalent, key selection criteria include cascaded VIN-above/below/equal-VOUT capability, dual-channel independent compensation, low-ripple operation, phase-lockable 75kHz–850kHz switching, and QFN-32 thermal performance in –40°C to 125°C environments.
Technical Context
The LTC7812EUH#PBF implements two independent current-mode control loops: Channel 1 (buck) uses VFB1 = 0.800V reference with SENSE1± differential sensing and ITH1-based peak-current programming; Channel 2 (boost) uses VFB2 = 1.200V reference with SENSE2± sensing and ITH2 control. Each channel features dedicated RUN, SS, PGOOD/OV outputs and programmable frequency via FREQ resistor or PLLIN synchronization.
Its cascaded architecture avoids discontinuous conduction mode artifacts-enabling non-pulsating input/output currents, reduced EMI, and stable regulation during 2.5V input dips. Gate drivers support TG/BG N-MOSFETs with <30ns transition times, 1.0–2.5Ω on-resistance, and bootstrapped BOOST1/BOOST2 supplies referenced to SW1/SW2 nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V–38V bias supply; supports 2.5V minimum after startup when biased from boost output |
| Buck Output Range | 0.8V–24V regulated output with 0.800V ±1.0% feedback reference |
| Boost Output Range | Up to 60V with 1.200V ±1.0% feedback reference and SENSE2+ current sourcing |
| Quiescent Current | 33µA (both channels active in sleep mode), enabling >100-hour battery runtime in low-power systems |
| Switching Frequency | 75kHz–850kHz programmable via resistor or external clock; fixed 350kHz/535kHz options available |
| Operating Temp | –40°C to +125°C junction temperature (E-grade), validated for automotive under-hood use |
| Package | 32-pin 5mm × 5mm QFN with exposed PGND pad for thermal dissipation (θJA = 44°C/W) |
Pinout & Package
Package: 32-lead plastic QFN (5mm × 5mm), exposed thermal pad (Pin 33) soldered to PGND plane for electrical and thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 (1, 30) | Switch node connections | Direct connection points to buck and boost inductor terminals; high dv/dt nodes requiring tight layout |
| TG1, TG2 (2, 29) | Top gate drivers | Floating N-MOSFET gate drives with INTVCC-referenced swing; require bootstrap capacitors to SW |
| BG1, BG2 (31, 27) | Bottom gate drivers | Ground-referenced N-MOSFET gate drives; sink/source up to 1.5A peak current |
| SENSE1+, SENSE1– (7, 8) SENSE2+, SENSE2– (12, 13) | Differential current sense inputs | Enable RSENSE or DCR sensing; SENSE2+ sources current for accurate boost-side current measurement |
| VFB1, VFB2 (6, 14) | Feedback voltage inputs | Compare output divider voltage against 0.800V (buck) or 1.200V (boost); ±1% tolerance over temp |
| RUN1, RUN2 (17, 19) | Independent enable inputs | 1.17V/1.20V thresholds; both pulled below 0.7V shuts down entire IC to 10µA |
| PGOOD1 (3), OV2 (22) | Open-drain status outputs | PGOOD1 asserts when VFB1 deviates >±10%; OV2 asserts when VFB2 exceeds +10% setpoint |
| PLLIN/MODE (10) | Sync & light-load mode control | Accepts external clock for synchronization; selects Burst Mode (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced CCM (INTVCC) |
Key Features
| Feature | Design Value |
|---|---|
| Cascaded Boost+Buck topology | Enables single-output regulation from inputs above, below, or equal to VOUT-eliminating need for separate buck-boost ICs |
| Independent loop compensation | Separate ITH1/ITH2 pins allow optimized transient response for each output without cross-coupling |
| Low-noise current sensing | SENSE1– supplies current when VOUT > INTVCC+0.5V; SENSE2+ actively sources current-reducing offset errors |
| Thermal-aware gate drive | TG/BG drivers rated for 150°C operation with fast rise/fall times (<30ns) and matched dead-time control |
| Robust start-up support | UVLO threshold of 4.15V (rising) with 350mV hysteresis ensures reliable entry from weak batteries or cold-crank conditions |
Applications
| Automotive Infotainment Power | Industrial Programmable Logic Controller |
|---|---|
Use Scenario: Powering 12V/8A core rail in head-unit systems subjected to 2.5V cold-crank transients and 38V load-dump spikes. IC Role / Device Role / Timing Role: LTC7812EUH#PBF acts as primary cascaded regulator-boost stage maintains VMID at 14V, buck stage regulates stable 12V output independent of input variation. Use Value: Continuous input/output current eliminates ripple-induced EMI in sensitive RF sections and sustains regulation during 2.5V dips without brownout. | Use Scenario: Generating isolated 24V fieldbus supply from unregulated 18–36V industrial bus with strict efficiency and thermal constraints. IC Role / Device Role / Timing Role: LTC7812EUH#PBF configures boost-first to 36V, then buck to precise 24V with independent feedback-enabling dynamic adjustment of intermediate rail. Use Value: Dual-loop optimization reduces output overshoot to <2% during 5A load steps, meeting IEC 61000-4-4 immunity requirements. |
| High-Power Portable Test Equipment | Medical Imaging Sensor Bias Supply |
Use Scenario: Battery-powered oscilloscope requiring 5V/3A and ±15V analog rails from single Li-ion (2.7–4.2V) source. IC Role / Device Role / Timing Role: LTC7812EUH#PBF operates in boost-only mode for +15V, while buck channel generates clean 5V-both controlled via shared RUN logic. Use Value: 33µA sleep IQ extends 4-cell pack runtime to >12 hours in standby; programmable frequency avoids noise coupling into ADC front-end. | Use Scenario: Low-noise 48V bias for CMOS image sensor arrays in portable ultrasound devices, where EMI must not corrupt 16-bit pixel data. IC Role / Device Role / Timing Role: LTC7812EUH#PBF drives lossless DCR-sensed boost stage to 48V with phase-locked 400kHz switching synchronized to system clock. Use Value: Non-pulsating input current reduces conducted EMI by >15dB vs conventional buck-boost, easing CISPR-22 Class B 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 |
|---|---|---|---|
| LTC7813EUH#PBF | Same pinout and architecture but adds integrated LDO for VBIAS generation; higher IQ (45µA sleep) | Preferred when bias supply is unavailable or noisy; less suitable for ultra-low-IQ battery systems | Select LTC7813EUH#PBF only if internal LDO simplifies BOM and board space outweighs 12µA IQ penalty |
| MP2918GL-Z | Single-chip buck-boost controller (not cascaded); fixed 4.5V–36V input; no independent loop compensation | Lower cost for basic buck-boost needs but lacks VIN-above/below/equal-VOUT flexibility and transient optimization | Choose MP2918GL-Z for cost-sensitive, non-critical applications where cascaded topology isn't required |
Compared with LTC7813EUH#PBF, the LTC7812EUH#PBF offers lower quiescent current and greater design flexibility via independent boost/buck control; versus MP2918GL-Z, it provides superior transient response, wider input range, and true cascaded operation for demanding automotive and industrial systems.
Availability
LTC7812EUH#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and high-power portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC7812EUH#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 (now part of Analog Devices, Inc., following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC7812EUH#PBF belongs to Linear's high-voltage monolithic controller product line, engineered specifically for robust, efficient, and flexible multi-rail power conversion in automotive, industrial, and medical applications where reliability and thermal performance are critical.
FAQ
What is the minimum input voltage required for the LTC7812EUH#PBF to operate continuously?
The LTC7812EUH#PBF requires a minimum 4.5V bias supply on VBIAS for initial startup. Once running, if biased from its own boost output, it sustains regulation down to 2.5V input-critical for automotive cold-crank scenarios. This 2.5V capability is confirmed in the datasheet's "Output Remains in Regulation Through Input Dips" feature and Electrical Characteristics table under SENSE2 common-mode range.
Can the LTC7812EUH#PBF be used in a standalone boost-only configuration?
Yes, the LTC7812EUH#PBF supports standalone boost operation. Channel 2 (boost) functions independently: connect RUN2 high, disable RUN1, configure feedback via VFB2 and resistive divider, and route SENSE2+/– to current-sense elements. The datasheet's Typical Application diagram and Pin Functions section confirm full boost-channel autonomy without buck-stage involvement.
How does the PLLIN/MODE pin affect light-load efficiency in the LTC7812EUH#PBF?
The PLLIN/MODE pin directly selects light-load operating mode: grounded → Burst Mode (highest efficiency at µA loads); tied to INTVCC → forced continuous conduction (lowest noise); biased to 1.2V–(INTVCC–1.3V) → pulse-skipping. This is specified in the Pin Functions section and Electrical Characteristics table under "IQ Sleep Mode" conditions, with measured 28µA (buck-only) and 33µA (both-on) values.
What is the maximum achievable boost output voltage using the LTC7812EUH#PBF?
The LTC7812EUH#PBF supports boost output voltages up to 60V, as explicitly stated in the Features list and Electrical Characteristics table under "VOUT2 Boost Regulated Output Voltage Set Point." This limit is constrained by the absolute maximum rating of BOOST2 (–0.3V to 76V) and SW2 (–5V to 70V), allowing safe operation with appropriate external MOSFETs and layout.
Does the LTC7812EUH#PBF support lossless inductor DCR current sensing on both channels?
Yes, the LTC7812EUH#PBF supports lossless DCR sensing on both channels via dedicated SENSE1+/– and SENSE2+/– inputs. The datasheet states "RSENSE or Lossless DCR Current Sensing" as a key feature, and the Pin Functions section details how SENSE1– supplies current when VOUT1 > INTVCC+0.5V and SENSE2+ sources current-enabling accurate DCR-based current measurement without sense resistors.
LTC7812EUH#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)
LTC7812EUH#PBF FAQ
1.How can I place an order for LTC7812EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7812EUH#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 LTC7812EUH#PBF reliable?
The price and inventory of LTC7812EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7812EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC7812EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7812EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7812EUH#PBF?
LTC7812EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7812EUH#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 LTC7812EUH#PBF?
For technical support, including LTC7812EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7812EUH#PBF requirements.
6.How does Aetrix verify that LTC7812EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7812EUH#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 LTC7812EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC7812EUH#PBF?
All LTC7812EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7812EUH#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 LTC7812EUH#PBF part is unused and in its original packaging.
Return procedure for LTC7812EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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