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Analog Devices Inc. LTC7813EUH#PBF
- Part No.:
- LTC7813EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC7813EUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,959
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Product details
Overview
LTC7813EUH#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous Boost+Buck DC/DC controller driving all-N-channel MOSFET stages. It integrates independent 60V boost and buck controllers, supports input voltages from 4.5V to 60V (or down to 2.2V post-startup), delivers ≤34µA quiescent current with both channels active, and operates in a 32-pin 5mm × 5mm QFN package for automotive power systems requiring wide VIN range and cold-crank resilience.
For engineers reviewing the LTC7813EUH#PBF datasheet, LTC7813EUH#PBF pinout, LTC7813EUH#PBF application, or LTC7813EUH#PBF equivalent, key selection criteria include cascaded topology support for VIN-above/below/equal-VOUT regulation, OPTI-DRIVE gate voltage programmability (5V–10V), phase-lockable switching frequency (75kHz–850kHz), RSENSE/DCR current sensing, and independent loop compensation for fast transient response in battery-powered industrial converters.
Technical Context
The LTC7813EUH#PBF implements a non-inverting cascaded architecture: the boost stage elevates input voltage to an intermediate rail, which the buck stage then regulates to final output. This eliminates pulsating input/output currents-reducing EMI and ripple versus conventional buck-boost topologies. Each channel features dedicated error amplifiers (ITH1/ITH2), current sense comparators (SENSE1±/SENSE2±), and feedback references (VFB1 = 0.8V, VFB2 = 1.2V/10V/12V selectable).
Control logic enables flexible operation modes: Burst Mode® (low IQ), pulse-skipping, or forced continuous conduction via PLLIN/MODE pin; soft-start via TRACK/SS1 and SS2; and programmable current limit thresholds (50mV/75mV/100mV) via ILIM pin. Gate drivers support high-side N-MOSFETs using bootstrapped supplies (BOOST1/BOOST2) and deliver <100ns transition times with integrated dead-time control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V main bias; operates down to 2.2V after startup when biased from boost output |
| Buck Output Range | 0.8V to 60V - supports wide output regulation with external resistive divider |
| Boost Output Range | Up to 60V - enables high-voltage intermediate rail generation |
| Quiescent Current | 34µA (both channels active, sleep mode) - extends runtime in battery systems |
| Switching Frequency | 75kHz to 850kHz - programmable via resistor or synchronizable to external clock |
| Package | 32-pin 5mm × 5mm QFN (UH) - exposed pad required for thermal management |
| Operating Temp | –40°C to +125°C - qualified for automotive and industrial environments |
Pinout & Package
Package: 32-lead plastic QFN (5mm × 5mm), exposed thermal pad (Pin 33) must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 (1, 30) | Switch node connections | Connect to inductor terminals; carry high di/dt switching currents |
| TG1, TG2 (2, 29) | Top-gate drivers | Floating outputs driving N-MOSFET gates; swing = DRVCC above respective SW node |
| BG1, BG2 (31, 27) | Bottom-gate drivers | Ground-referenced outputs driving N-MOSFET gates; swing = 0V to DRVCC |
| VFB1 (6), VFB2 (19) | Feedback inputs | VFB1 senses buck output (0.8V reference); VFB2 senses boost output (1.2V/10V/12V selectable) |
| SENSE1+, SENSE1– (7, 8), SENSE2+, SENSE2– (12, 13) | Differential current sense inputs | Measure MOSFET RDS(on) or sense-resistor voltage to set overcurrent threshold |
| TRACK/SS1 (3), SS2 (23) | Soft-start & tracking inputs | Capacitor-based ramp control; TRACK/SS1 enables buck output to track another supply |
| PLLIN/MODE (10) | Synchronization & light-load mode control | Accepts external clock for synchronization; selects Burst Mode®, pulse-skipping, or forced CCM |
| DRVSET (22), DRVUV (21) | Gate drive voltage & UVLO configuration | DRVSET sets DRVCC to 5V–10V; DRVUV selects low/high UVLO thresholds for DRVCC/EXTVCC |
Key Features
| Feature | Design Value |
|---|---|
| Cascaded Boost+Buck topology | Enables continuous input/output current - reduces EMI and input/output capacitor stress vs. single-stage buck-boost |
| Independent loop compensation | Separate ITH1/ITH2 pins allow optimized transient response for each output without cross-coupling |
| OPTI-DRIVE gate voltage control | DRVSET pin programs DRVCC from 5V to 10V - balances gate drive strength and MOSFET switching loss |
| Three-level current limit programming | ILIM pin selects 50mV/75mV/100mV sense thresholds - adapts to RSENSE or DCR sensing schemes |
| Wide-frequency synchronization | PLLIN/MODE accepts 75kHz–850kHz external clocks - enables system-level EMI reduction through frequency alignment |
Applications
| Automotive Cold-Crank Power Supply | Industrial Dual-Output DC-DC Converter |
|---|---|
Use Scenario: Vehicle battery drops to 2.2V during engine cranking while maintaining stable 12V and 5V rails for infotainment and ADAS modules. IC Role / Device Role / Timing Role: LTC7813EUH#PBF acts as primary controller regulating cascaded boost+buck stages to sustain regulated outputs despite deep input dips. Use Value: Input operation down to 2.2V ensures uninterrupted power delivery during cold-crank events without brownout or reset. | Use Scenario: Programmable logic controller (PLC) requires isolated 24V and 5V outputs from a 12–48V industrial bus with minimal board space. IC Role / Device Role / Timing Role: LTC7813EUH#PBF configures boost stage for 24V intermediate rail and buck stage for clean 5V output with independent feedback loops. Use Value: Independent compensation and fast transient response prevent output droop during PLC I/O switching transients. |
| Battery-Powered Test Equipment | High-Voltage LED Driver Bias Supply |
Use Scenario: Portable oscilloscope uses Li-ion battery (3.0–4.2V) to generate ±15V analog rails and 3.3V digital supply. IC Role / Device Role / Timing Role: LTC7813EUH#PBF operates in cascaded mode: boost generates 18V intermediate rail, buck derives precise ±15V and 3.3V outputs. Use Value: 34µA quiescent current extends battery life between charges without sacrificing regulation accuracy. | Use Scenario: Medical endoscope LED array requires stable 48V bias from 24V input with low EMI to avoid image sensor interference. IC Role / Device Role / Timing Role: LTC7813EUH#PBF configured as standalone boost controller drives high-efficiency 48V LED string with low-ripple output. Use Value: Continuous boost current and low EMI reduce conducted noise coupling into sensitive imaging circuitry. |
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 |
|---|---|---|---|
| LTC7810EUH#PBF | Single-output synchronous buck controller; no boost stage; max VIN = 40V; IQ = 25µA | Only suitable for step-down-only designs; cannot regulate VIN-above-VOUT or support cold-crank below 4.5V | Select when only buck conversion is needed and input never falls below 4.5V |
| LTC3891EUF#PBF | 60V input, dual-output synchronous buck controller; includes integrated LDOs; no boost capability; IQ = 50µA | Lacks cascaded topology - cannot generate outputs higher than input; no cold-crank support below 4.5V | Choose for cost-sensitive dual-buck applications where input always exceeds both outputs |
Compared with LTC7810EUH#PBF and LTC3891EUF#PBF, the LTC7813EUH#PBF uniquely supports VIN-above/below/equal-VOUT regulation, cold-crank operation to 2.2V, and cascaded EMI reduction - making it the only option for automotive and wide-input industrial converters requiring dual-rail flexibility.
Availability
LTC7813EUH#PBF is available at Aetrix Electronics and suitable for automotive power systems, industrial PLCs, and battery-powered test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC7813EUH#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive qualification standards.
The LTC7813EUH#PBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for demanding automotive and industrial applications requiring wide input range, ultra-low quiescent current, and robust cold-crank performance.
FAQ
What is the minimum input voltage the LTC7813EUH#PBF can operate from after startup?
The LTC7813EUH#PBF can operate from as low as 2.2V after startup when biased from the output of its internal boost regulator. This capability is critical for automotive cold-crank scenarios where battery voltage temporarily collapses. The device requires ≥4.5V on VBIAS for initial startup, but once running, the boost output powers the controller allowing continued regulation even if input dips to 2.2V. This behavior is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
How does the LTC7813EUH#PBF achieve lower EMI compared to conventional buck-boost regulators?
The LTC7813EUH#PBF achieves lower EMI by using a cascaded Boost+Buck architecture that delivers continuous, non-pulsating input and output currents - unlike single-stage buck-boost topologies that produce discontinuous current waveforms. This reduces high-frequency harmonic content and simplifies EMI filter design. The datasheet explicitly states this advantage in the Description section and confirms it via typical performance plots showing reduced ripple in Figure 15 circuit measurements.
Can the LTC7813EUH#PBF regulate both outputs simultaneously, or must it be used in cascaded mode only?
The LTC7813EUH#PBF supports both configurations: independent dual-output regulation (e.g., boost generating 12V for one subsystem, buck generating 3.3V for another) and cascaded mode (boost output feeds buck input to regulate a final output regardless of VIN relative to VOUT). The Application section confirms "two separate outputs or be cascaded", and the Functional Diagram shows fully independent control paths for Channel 1 (buck) and Channel 2 (boost), enabling either use case without hardware change.
What is the purpose of the VPRG2 pin on the LTC7813EUH#PBF, and how does it affect boost output configuration?
The VPRG2 pin (Pin 4) configures the LTC7813EUH#PBF's boost channel output mode: grounding VPRG2 enables adjustable output via external resistors and VFB2 (1.2V reference); floating VPRG2 selects fixed 10V output; tying VPRG2 to INTVCC selects fixed 12V output. This is documented in the Pin Functions section and Electrical Characteristics table (VFB2 values listed for VPRG2 = 0V/FLOAT/INTVCC), allowing rapid reconfiguration without changing feedback networks.
Does the LTC7813EUH#PBF require external bootstrap diodes for high-side gate drive?
No, the LTC7813EUH#PBF does not require external bootstrap diodes. Its integrated charge pump circuitry for BOOST1 and BOOST2 provides self-contained high-side gate drive for N-channel MOSFETs. The datasheet explicitly lists "No External Bootstrap Diodes Required" under Features and details BOOST1/BOOST2 functionality in the Pin Functions section, confirming internal bootstrap capacitor charging without discrete diode components.
LTC7813EUH#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 ~ 60V
- Frequency - Switching:
- 105kHz ~ 835kHz, 350kHz ~ 535kHz
- Duty Cycle (Max):
- 96%, 99%
- Synchronous Rectifier:
- Yes
- 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)
LTC7813EUH#PBF FAQ
1.How can I place an order for LTC7813EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7813EUH#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 LTC7813EUH#PBF reliable?
The price and inventory of LTC7813EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7813EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC7813EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7813EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7813EUH#PBF?
LTC7813EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7813EUH#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 LTC7813EUH#PBF?
For technical support, including LTC7813EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7813EUH#PBF requirements.
6.How does Aetrix verify that LTC7813EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7813EUH#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 LTC7813EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC7813EUH#PBF?
All LTC7813EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7813EUH#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 LTC7813EUH#PBF part is unused and in its original packaging.
Return procedure for LTC7813EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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