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Analog Devices Inc. LTC7813HUH#PBF
- Part No.:
- LTC7813HUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC7813HUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,519
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Product details
Overview
LTC7813HUH#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous Boost+Buck DC/DC controller IC driving all-N-channel MOSFET stages. It integrates independent boost and buck controllers supporting input voltages from 4.5V to 60V, regulating two outputs or cascading for VIN above/below/equal to VOUT up to 60V, with 34µA no-load quiescent current (both channels active), used in automotive cold-crank power systems and high-efficiency battery-operated industrial supplies.
For engineers reviewing the LTC7813HUH#PBF datasheet, LTC7813HUH#PBF pinout, LTC7813HUH#PBF application, or LTC7813HUH#PBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, OPTI-DRIVE gate voltage programmability (5V–10V), phase-lockable 75kHz–850kHz switching frequency, RSENSE/DCR current sensing, and cascaded topology enabling continuous input/output current for low EMI.
Technical Context
The LTC7813HUH#PBF implements a true cascaded Boost+Buck architecture: the boost stage feeds the buck stage, enabling regulation across wide input ranges including sub-2.2V post-startup operation when biased from its own boost output. Its independent feedback loops (VFB1/VFB2) and compensation points (ITH1/ITH2) allow separate loop optimization for fast transient response on each rail.
It features dual N-channel gate drivers with programmable DRVCC (5V–10V), integrated 5V INTVCC LDO for analog/digital circuitry, and flexible startup control via RUN1/RUN2 pins. The PLLIN/MODE pin supports external synchronization, Burst Mode®, pulse-skipping, or forced continuous conduction-critical for light-load efficiency tuning in automotive and industrial applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V main bias supply; operates down to 2.2V after startup when self-biased from boost output. |
| Buck Output Range | 0.8V to 60V regulated output; feedback reference VFB1 = 0.800V ±12mV over temperature. |
| Boost Output Range | Up to 60V; VFB2 reference selectable as 1.200V (external resistive), 10V, or 12V via VPRG2 pin. |
| Quiescent Current | 34µA with both channels active in sleep mode; enables >100-hour runtime in 100µA-system standby applications. |
| Switching Frequency | 75kHz to 850kHz, programmable via resistor or external clock; supports EMI reduction via spread-spectrum sync. |
| Operating Temperature | –40°C to +150°C junction (H-grade); qualified for under-hood automotive and high-temp industrial environments. |
| Package | 32-pin 5mm × 5mm QFN (UH); exposed pad must be soldered to PCB for thermal and electrical performance. |
Pinout & Package
Package: 32-lead plastic QFN (5mm × 5mm), exposed thermal pad (Pin 33) tied to GND. Requires PCB copper pour and multiple vias for thermal management per Analog Devices UH package guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 (1, 30) | Switch node connections | Connect to buck and boost inductor switches; high dv/dt nodes requiring tight layout and Kelvin sensing. |
| TG1, TG2 (2, 29) | Top-gate drivers | Floating N-channel gate drives referenced to SWx; require BOOSTx–SWx bootstrap capacitors. |
| BG1, BG2 (31, 27) | Bottom-gate drivers | Ground-referenced N-channel gate drives; swing 0V to DRVCC (5V–10V). |
| VFB1, VFB2 (6, 19) | Buck/boost feedback inputs | High-impedance inputs (±50nA) sensing output divider; VFB1 = 0.8V ref, VFB2 = 1.2V/10V/12V ref. |
| ITH1, ITH2 (5, 20) | Error amplifier outputs | Compensation nodes for loop stability; set current limit threshold and regulate loop bandwidth. |
| RUN1, RUN2 (16, 17) | Channel enable controls | Logic-level inputs; <1.2V disables channel, <0.7V shuts down entire IC (3.6µA shutdown IQ). |
| PLLIN/MODE (10) | Synchronization & light-load mode | Accepts external clock (75–850kHz) or selects Burst Mode®/pulse-skipping/forced CCM via voltage level. |
| DRVSET (22) | Gate drive voltage programming | Resistor-to-GND sets DRVCC from 5V to 10V; critical for optimizing MOSFET RDS(on) vs gate charge trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Cascaded Boost+Buck topology | Delivers continuous input/output current-reducing RMS ripple by >5× vs conventional buck-boost, lowering EMI filter size/cost. |
| OPTI-DRIVE gate voltage control | DRVSET-programmable 5V–10V gate drive optimizes efficiency across load range and MOSFET selection without layout change. |
| Independent dual-loop compensation | Separate ITH1/ITH2 pins enable per-channel loop tuning-achieving <50µs output recovery from 50% load step at 24V/10A. |
| Wide-input cold-crank support | Maintains regulation during automotive cranking dips to 2.2V (post-startup), eliminating need for auxiliary bias rails. |
| Three current sense threshold options | ILIM pin selects 50mV/75mV/100mV sense thresholds-enabling optimal RSENSE choice for accuracy vs conduction loss. |
Applications
| Automotive Engine Control Unit (ECU) Power | Industrial Programmable Logic Controller (PLC) I/O Module |
|---|---|
Use Scenario: Powers 5V microcontroller and 24V solenoid drivers from a 12V battery subject to cold-crank dips to 2.2V. IC Role / Device Role / Timing Role: LTC7813HUH#PBF acts as primary cascaded regulator-boosting battery to 24V, then bucking to 5V-with independent loop control ensuring stable MCU supply during transients. Use Value: Eliminates need for discrete boost + buck ICs or complex PMICs; single-chip solution reduces BOM count by 40% and improves cold-crank immunity beyond AEC-Q100 Grade 1. | Use Scenario: Generates isolated 15V and 5V rails from a 24V factory bus for analog sensor front-ends and digital logic in harsh EMI environments. IC Role / Device Role / Timing Role: LTC7813HUH#PBF regulates both outputs simultaneously using shared current sensing and synchronized switching to minimize conducted noise. Use Value: Continuous current topology cuts input ripple by 70%, reducing common-mode choke size by 50% and meeting EN 61000-6-4 Class A emissions without shielding. |
| High-Power Portable Test Equipment | Telecom Remote Radio Head (RRH) Bias Supply |
Use Scenario: Supplies 12V/5A and 3.3V/10A from a 14.4V Li-ion pack in handheld spectrum analyzers requiring >8-hour runtime. IC Role / Device Role / Timing Role: LTC7813HUH#PBF operates in Burst Mode® at light loads and forced CCM at full load-maintaining >92% efficiency across 1mA–10A range. Use Value: 34µA dual-channel IQ extends battery life by 3.2× vs comparable dual controllers; programmable DRVCC allows use of low-RDS(on) MOSFETs without excessive gate charge penalty. | Use Scenario: Provides 28V/3A RF PA bias and 5V/2A digital core supply from a 48V telecom rectifier with strict thermal limits in sealed outdoor enclosures. IC Role / Device Role / Timing Role: LTC7813HUH#PBF's H-grade (–40°C to +150°C) operation and 5mm × 5mm QFN package enable direct mounting on heatsink-limited RRH PCBs. Use Value: Thermal resistance θJA = 44°C/W allows full 6A total output current at 85°C ambient-eliminating need for external thermal monitoring or derating. |
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 |
|---|---|---|---|
| LTC7810HUH#PBF | Single-channel synchronous buck controller; no boost stage; 3.5V–40V input; 20µA IQ (buck only). | Only suitable for step-down-only applications; cannot replace LTC7813HUH#PBF in cascaded or wide-VIN-range boost+buck topologies. | Select only if system requires only buck regulation and VIN never falls below 3.5V. |
| MPQ4333HG-AEC1-P | Monolithic 3.5A buck-boost converter (not controller); fixed 5V/3.3V outputs; 4.5V–36V input; AEC-Q100 Grade 1. | Integrated power stage limits max output voltage to 36V and peak current to 3.5A; no external MOSFET flexibility or cascaded configuration. | Choose for cost-sensitive automotive body electronics where 36V/3.5A limits are acceptable and layout simplicity outweighs design flexibility. |
Compared with LTC7810HUH#PBF and MPQ4333HG-AEC1-P, the LTC7813HUH#PBF uniquely supports 60V output, cascaded topology for ultra-wide VIN/VOUT ratios, and independent dual-loop control-making it irreplaceable in high-voltage industrial and under-hood automotive applications demanding >150°C operation and field-serviceable MOSFET replacement.
Availability
LTC7813HUH#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and high-power portable test equipment requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC7813HUH#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 and industrial qualification standards.
The LTC7813HUH#PBF belongs to the LTC78xx family of high-voltage synchronous controllers, designed specifically for demanding applications requiring wide input ranges, low quiescent current, and robust thermal performance in harsh environments.
FAQ
What is the maximum operating junction temperature for the LTC7813HUH#PBF?
The LTC7813HUH#PBF is rated for –40°C to +150°C junction temperature (H-grade). This specification is guaranteed per datasheet Absolute Maximum Ratings and validated through production testing across the full range. The exposed pad (Pin 33) must be soldered to a thermally robust PCB plane to achieve θJA = 44°C/W and sustain continuous operation at 150°C junction under typical load conditions.
Can the LTC7813HUH#PBF operate with an input voltage below 4.5V?
Yes-the LTC7813HUH#PBF can operate with input as low as 2.2V after startup when biased from its own boost output (VBIAS connected to VOUT2). However, initial startup requires ≥4.5V on VBIAS. This capability enables reliable regulation during automotive cold-crank events where battery voltage collapses transiently below 4.5V but remains above 2.2V post-startup.
How does the VPRG2 pin affect the boost output configuration of the LTC7813HUH#PBF?
The VPRG2 pin on the LTC7813HUH#PBF selects the boost output mode: grounding VPRG2 enables adjustable output via external resistors with VFB2 = 1.200V reference; floating VPRG2 sets fixed 10V output; tying VPRG2 to INTVCC sets fixed 12V output. This eliminates external resistor networks for standard voltages while retaining flexibility for custom outputs.
What is the purpose of the ILIM pin on the LTC7813HUH#PBF?
The ILIM pin on the LTC7813HUH#PBF configures the maximum current sense threshold for both boost and buck channels: tying ILIM to GND selects 50mV, to INTVCC selects 100mV, and floating selects 75mV. This allows designers to optimize RSENSE value for accuracy (low mV) versus power loss (high mV) without changing compensation or layout.
Does the LTC7813HUH#PBF support external clock synchronization?
Yes-the LTC7813HUH#PBF supports external synchronization via the PLLIN/MODE pin, accepting clocks from 75kHz to 850kHz. When an external clock is applied, the phase-locked loop aligns rising edges of TG1 and BG2 to the clock's rising edge, forcing forced continuous conduction mode and enabling deterministic EMI reduction in multi-rail systems.
LTC7813HUH#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC7813HUH#PBF FAQ
1.How can I place an order for LTC7813HUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7813HUH#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 LTC7813HUH#PBF reliable?
The price and inventory of LTC7813HUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7813HUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC7813HUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7813HUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7813HUH#PBF?
LTC7813HUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7813HUH#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 LTC7813HUH#PBF?
For technical support, including LTC7813HUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7813HUH#PBF requirements.
6.How does Aetrix verify that LTC7813HUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7813HUH#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 LTC7813HUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC7813HUH#PBF?
All LTC7813HUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7813HUH#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 LTC7813HUH#PBF part is unused and in its original packaging.
Return procedure for LTC7813HUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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