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Analog Devices Inc. LTC7813IUH#PBF
- Part No.:
- LTC7813IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC7813IUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:219
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Product details
Overview
LTC7813IUH#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 2.2V after startup), delivers ≤34µA quiescent current with both channels active, and operates in a 32-pin 5mm × 5mm QFN package for automotive and industrial power systems.
For engineers reviewing the LTC7813IUH#PBF datasheet, LTC7813IUH#PBF pinout, LTC7813IUH#PBF application, or LTC7813IUH#PBF equivalent, key selection considerations include cascaded VIN-above/below/equal-VOUT capability, OPTI-DRIVE gate drive level adjustment (5V–10V), phase-lockable switching frequency (75kHz–850kHz), lossless DCR or RSENSE current sensing, and cold-crank operation down to 2.2V input.
Technical Context
The LTC7813IUH#PBF implements two fully independent control loops: a constant-frequency current-mode boost controller (Channel 2) and a constant-frequency current-mode buck controller (Channel 1), each with dedicated ITH compensation nodes, VFB feedback inputs, and SENSE± differential current sense inputs. Its cascaded architecture enables continuous input/output currents-unlike conventional buck-boost topologies-reducing EMI and output ripple.
It features programmable DRVCC (5V–10V), selectable operating modes via PLLIN/MODE (Burst Mode®, pulse-skipping, or forced continuous), and flexible VPRG2-configurable boost output (adjustable via external resistors or fixed 10V/12V). The device supports synchronization, soft-start via TRACK/SS1 and SS2, and robust protection including PGOOD1, undervoltage lockout, and foldback current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V bias supply; operates down to 2.2V after startup when biased from boost output |
| Quiescent Current | 34µA with both channels active in sleep mode - extends battery runtime in portable and automotive systems |
| Switching Frequency | 75kHz to 850kHz, phase-lockable - enables EMI reduction via spread-spectrum or system clock synchronization |
| Buck Output Range | 0.8V to 60V - supports wide-range intermediate bus and point-of-load regulation |
| Boost Output Range | Up to 60V - suitable for high-voltage rails in industrial sensors and LED drivers |
| Current Sensing | RSENSE or lossless DCR - eliminates sense resistor losses while maintaining accurate cycle-by-cycle current limiting |
| Package | 32-pin 5mm × 5mm QFN with exposed thermal pad - provides low θJA (44°C/W) for high-power density designs |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN (UH), exposed pad (Pin 33) connected to GND and required to be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 (1, 30) | Switch node connections | Direct connection points to buck and boost inductor switches; high dV/dt nodes requiring careful layout |
| TG1, TG2 (2, 29) | Top-gate drivers | Floating N-channel gate drives referenced to SW nodes; swing = DRVCC above SW voltage |
| BG1, BG2 (31, 27) | Bottom-gate drivers | Ground-referenced N-channel gate drives; swing = 0V to DRVCC |
| VFB1, VFB2 (6, 19) | Buck/boost feedback inputs | High-impedance inputs sensing regulated output via resistor dividers; buck reference = 0.8V, boost reference = 1.2V (or 10V/12V if VPRG2 configured) |
| SENSE1+, SENSE1– (7, 8) SENSE2+, SENSE2– (12, 13) | Differential current sense inputs | Enable precise current-mode control; support RSENSE or DCR sensing with programmable threshold (43–109mV) |
| TRACK/SS1, SS2 (3, 23) | Soft-start and tracking inputs | Control output ramp rate during startup; TRACK/SS1 allows buck output to track another supply |
| PLLIN/MODE (10) | Synchronization and light-load mode select | Accepts external clock for synchronization; configures Burst Mode®, pulse-skipping, or forced continuous operation |
| DRVSET (22) | Gate drive voltage programming | Configures DRVCC output to 5V–10V via resistor divider - optimizes MOSFET RDS(on) vs switching loss trade-off |
Key Features
| Feature | Design Value |
|---|---|
| Cascaded Boost+Buck topology | Enables continuous input/output current - reduces EMI and input/output capacitor stress versus traditional buck-boost |
| OPTI-DRIVE gate drive level control | Adjusts DRVCC from 5V to 10V to optimize conduction vs switching losses across diverse MOSFET selections |
| Independent loop compensation | Dedicated ITH1/ITH2 pins allow separate bandwidth and transient response tuning for buck and boost channels |
| Cold-crank operation | Maintains regulation with input dips down to 2.2V after startup - critical for automotive stop-start and cranking conditions |
| No external bootstrap diodes required | Integrated charge pump for BOOST2 and internal bootstrapping for BOOST1 eliminate discrete diodes and reduce BOM count |
Applications
| Automotive Start-Stop Systems | Industrial Wide-Input Power Supplies |
|---|---|
Use Scenario: Regulating stable 12V or 24V rail during engine cranking where battery voltage drops to 2.2V–6V. IC Role / Device Role / Timing Role: Dual-channel controller managing cascaded boost-buck conversion to maintain regulated output despite severe input transients. Use Value: Ensures uninterrupted operation of infotainment, ADAS, and body control modules without brownouts or resets. | Use Scenario: Converting unregulated 12–48V industrial bus to multiple isolated or non-isolated rails (e.g., 3.3V, 5V, 12V, 24V). IC Role / Device Role / Timing Role: High-voltage synchronous controller delivering up to 60V output with independent buck/boost regulation and fast transient response. Use Value: Reduces need for pre-regulators and simplifies multi-rail power architecture while meeting IEC 61000-4-5 surge immunity requirements. |
| High-Power Battery-Operated Equipment | Programmable Test & Measurement Power |
Use Scenario: Portable medical devices or handheld test instruments powered by 2–4 cell Li-ion (6–16.8V) requiring 5V, 12V, and ±15V rails. IC Role / Device Role / Timing Role: Low-IQ dual controller enabling long runtime via 34µA sleep current and efficient light-load operation across load range. Use Value: Extends battery life by >30% versus standard controllers while supporting dynamic load steps without output droop. | Use Scenario: Precision lab power supplies needing programmable output voltage and tight regulation over wide input ranges. IC Role / Device Role / Timing Role: Programmable frequency (75–850kHz), adjustable feedback references, and external sync enable deterministic timing and low-noise operation. Use Value: Supports low-noise, low-ripple outputs essential for ADC/DAC reference supplies and sensitive analog circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous Boost+Buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7812IUH#PBF | Single-output version (boost-only); lacks buck channel and associated pins (VFB1, SENSE1±, TRACK/SS1, etc.) | Only suitable when only boost functionality is needed; cannot replace LTC7813IUH#PBF in dual-output or cascaded configurations | Select LTC7812IUH#PBF only for cost-sensitive boost-only designs where buck regulation is handled externally. |
| LTC3891EFE#PBF | Single-channel 60V input synchronous buck controller with integrated LDO; no boost capability or cascaded topology support | Cannot regulate outputs above input; unsuitable for VIN-above-VOUT or bidirectional voltage conversion use cases | Choose LTC3891EFE#PBF for high-efficiency buck-only applications with simpler layout and lower component count. |
Compared with LTC7812IUH#PBF and LTC3891EFE#PBF, the LTC7813IUH#PBF uniquely supports true VIN-above/below/equal-VOUT operation through its integrated dual-channel cascaded architecture - enabling single-chip solutions for wide-input industrial and automotive power where input voltage uncertainty is inherent.
Availability
LTC7813IUH#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial wide-input power supplies, and high-power battery-operated equipment requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term lifecycle availability.
Supply support for LTC7813IUH#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-grade qualification and reliability testing.
The LTC7813IUH#PBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for demanding industrial and automotive applications requiring wide input range, ultra-low quiescent current, and robust transient performance under cold-crank and load-dump conditions.
FAQ
What is the minimum input voltage for LTC7813IUH#PBF after startup?
The LTC7813IUH#PBF can operate with input voltage as low as 2.2V after startup when biased from the output of its integrated boost regulator. This capability is critical for automotive cold-crank scenarios where battery voltage temporarily collapses. During initial startup, however, the device requires ≥4.5V on VBIAS to initialize properly before transitioning to low-voltage operation.
How does the VPRG2 pin configure the boost output voltage on LTC7813IUH#PBF?
On the LTC7813IUH#PBF, grounding VPRG2 enables adjustable boost output using external feedback resistors with a 1.2V reference at VFB2. Floating VPRG2 sets a fixed 10V output, while tying it to INTVCC selects a fixed 12V output. This pin directly determines whether VFB2 functions as a sensing node (for adjustable mode) or a direct output monitor (for fixed mode), and must be configured before power-up.
Can LTC7813IUH#PBF synchronize to an external clock, and which pins are involved?
Yes, the LTC7813IUH#PBF supports external synchronization via the PLLIN/MODE pin (Pin 10). When an external clock signal is applied, the internal phase-locked loop aligns rising edges of TG1 and BG2 to the external clock's rising edge, forcing both controllers into forced continuous conduction mode. This feature reduces beat frequencies and EMI in multi-converter systems and requires no additional components beyond proper AC-coupling and level-shifting if needed.
What is the purpose of the ILIM pin on LTC7813IUH#PBF, and how does it affect current limiting?
The ILIM pin (Pin 18) on the LTC7813IUH#PBF selects one of three maximum current sense thresholds: 43mV (ILIM = INTVCC), 75mV (ILIM = floating), or 100mV (ILIM = GND). This setting applies identically to both buck and boost channels and directly scales the peak inductor current limit. Choosing a higher threshold allows greater output current but reduces current-sense accuracy and noise immunity - design trade-offs must be validated per application.
Does LTC7813IUH#PBF require external bootstrap diodes for high-side gate drive?
No, the LTC7813IUH#PBF does not require external bootstrap diodes. It integrates a charge pump for BOOST2 and uses internal bootstrapping for BOOST1, eliminating discrete diodes and associated PCB area and reliability concerns. The BOOST1 and BOOST2 pins connect directly to external capacitors (typically 0.1µF ceramic) between BOOSTx and SWx, forming self-contained floating gate drive supplies for the top N-channel MOSFETs.
LTC7813IUH#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)
LTC7813IUH#PBF FAQ
1.How can I place an order for LTC7813IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7813IUH#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 LTC7813IUH#PBF reliable?
The price and inventory of LTC7813IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7813IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC7813IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7813IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7813IUH#PBF?
LTC7813IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7813IUH#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 LTC7813IUH#PBF?
For technical support, including LTC7813IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7813IUH#PBF requirements.
6.How does Aetrix verify that LTC7813IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7813IUH#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 LTC7813IUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC7813IUH#PBF?
All LTC7813IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7813IUH#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 LTC7813IUH#PBF part is unused and in its original packaging.
Return procedure for LTC7813IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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