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Analog Devices Inc. LTC7840IUFD#TRPBF
- Part No.:
- LTC7840IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7840IUFD#TRPBF.pdf
- Description:
- DUAL PHASE/OUTPUT NON-SYNCH BOOS
- Quantity:
- Payment:
- Shipping:
Inventory:4,585
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Product details
Overview
LTC7840IUFD#TRPBF from Analog Devices is a dual-phase, dual-output nonsynchronous boost controller driving external N-channel MOSFETs in high-voltage DC/DC conversion. It operates from 5.5V to 60V input, delivers programmable 50kHz–425kHz switching frequency, features ±1% 1.2V internal reference, dual RUN pins, and hiccup-mode overcurrent protection - used in telecom power supplies delivering up to 240V output.
For engineers reviewing the LTC7840IUFD#TRPBF datasheet, LTC7840IUFD#TRPBF pinout, LTC7840IUFD#TRPBF application, or LTC7840IUFD#TRPBF equivalent, key selection criteria include dual-phase current-mode control with dynamic slope recovery, adjustable max duty cycle (75–96%), 10µA ILIM programming current, 120–200ns minimum on-time, and thermal performance in the 4mm × 5mm QFN package.
Technical Context
The LTC7840IUFD#TRPBF implements peak current-mode control with smooth quadratic slope compensation and dynamic slope recovery per channel, enabling stable operation across wide input/output ratios. Its two independent control loops operate 180° out-of-phase, supporting dual-output regulation or interleaved single-output configurations with reduced input/output ripple.
It integrates cascaded LDOs: a 10V DRVCC regulator (4.4V UVLO) powers gate drivers, and a 3.8V INTVCC regulator (3.3V UVLO) supplies analog/digital circuitry. Both LDOs require dedicated local bypassing and must not be externally biased to avoid catastrophic failure or thermal overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - accommodates automotive cold-crank, industrial surges, and telecom -48V systems with headroom. |
| Switching Frequency | 50kHz to 425kHz - programmable via FREQ pin voltage or synchronized to external clock for EMI reduction. |
| Feedback Reference | 1.2V ±1% - enables precise output voltage setting with minimal resistor divider error sensitivity. |
| Max Duty Cycle | 75% to 96% - set by DMAX pin voltage (SGND/INTVCC/float), directly limiting boost ratio and MOSFET stress. |
| Min On-Time | 120ns to 200ns - configured via BLANK pin, critical for high-frequency operation at low VIN or high VOUT. |
| Current Sense Threshold | 75mV typical - adjustable down to ≤70mV using ILIM1/ILIM2 pins, optimizing sense resistor power loss and noise immunity. |
| Thermal Rating | –40°C to +125°C junction - validated for industrial and automotive under-hood applications with QFN package θJA = 47°C/W. |
Pinout & Package
The LTC7840IUFD#TRPBF is housed in a 28-lead, 4mm × 5mm plastic QFN package (UFD28) with exposed thermal pad soldered to SGND. This thermally enhanced package supports high-power boost designs requiring efficient heat dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE1 / GATE2 | High-side N-MOSFET gate drive outputs | 10V rail-referenced, 2Ω pull-up / 1Ω pull-down drivers - directly interface with high-voltage MOSFETs without level-shifting. |
| SENSE1+/SENSE1− / SENSE2+/SENSE2− | Differential current sense inputs | Reject common-mode noise on source-sense resistors; support accurate peak-current detection per phase. |
| VFB1 / VFB2 | Output voltage feedback inputs | Connect to resistor dividers; internal 1.2V reference enables precise regulation of two independent outputs. |
| ITH1 / ITH2 | Error amplifier output / current threshold control | Set peak inductor current per channel; also serve as compensation nodes for loop stability tuning. |
| RUN1 / RUN2 | Independent enable inputs | 1.22V turn-on threshold with 80mV hysteresis - allow staged startup or fault-isolated shutdown per channel. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Assert after 135µs mask timer when output is within ±10% of target - enable sequencing and system monitoring. |
| DMAX / BLANK / FREQ / SS1 / SS2 | Configuration and timing control pins | Enable hardware-programmable max duty cycle, minimum on-time, frequency, and soft-start ramp rate - no firmware required. |
| DRVCC / INTVCC / SGND / PGND | Power and ground rails | Separated analog (SGND) and power (PGND) grounds prevent noise coupling; DRVCC (10V) and INTVCC (3.8V) LDOs require dedicated ceramic bypassing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaved operation | 180° phase shift reduces input/output capacitor RMS current and EMI, enabling smaller passive components in high-power boost converters. |
| Hiccup-mode overcurrent protection | Auto-retry fault response with timing set by SS1/SS2 capacitors - protects MOSFETs and magnetics during sustained overload without latch-off. |
| Programmable minimum on-time | 120ns (BLANK = SGND) to 200ns (BLANK = INTVCC) - ensures reliable switching at high frequencies and high step-up ratios. |
| Flexible topology support | Configurable for boost, SEPIC, or flyback - same IC reused across multiple isolated/non-isolated DC/DC architectures with minimal component changes. |
| Dual independent RUN and PGOOD | Enables asymmetric startup, independent channel disable, and fault isolation - critical for redundant power systems and multi-rail sequencing. |
| Internal 10V/3.8V cascaded LDOs | Eliminates need for external bias supplies; strict sequencing requirements prevent latch-up and thermal runaway during power-up. |
Applications
| Telecom Power Supply | Industrial High-Voltage Bias Supply |
|---|---|
|
Use Scenario: Generating 240V DC from 12V battery backup in telecom line cards. IC Role / Device Role / Timing Role: Dual-phase nonsynchronous boost controller regulating two 120V outputs or interleaving for 240V single output. Use Value: Interleaving cuts input ripple current by >70%, reducing bulk capacitor size and extending lifetime in space-constrained chassis. |
Use Scenario: Providing isolated 48V/24V bias rails for PLC I/O modules operating from 24V DC field bus. IC Role / Device Role / Timing Role: Configured as dual-output boost to generate two regulated rails simultaneously with independent RUN control. Use Value: Eliminates need for secondary regulators; ±1% reference and dual PGOOD enable safe sequencing of analog front-end and digital logic sections. |
| Automotive ADAS Camera Power | Test Equipment HV Source |
|
Use Scenario: Powering 70V image sensor bias in automotive surround-view cameras from 9–16V battery. IC Role / Device Role / Timing Role: Single-output dual-phase boost with hiccup-mode protection against shorted sensor cables. Use Value: 60V max input withstands load-dump transients; 120ns min on-time sustains regulation even at lowest VIN and highest VOUT. |
Use Scenario: Programmable 36–240V DC source in automated test equipment requiring fast voltage settling. IC Role / Device Role / Timing Role: Boost controller with adjustable soft-start (SS1/SS2) and precise 1.2V reference for calibration-grade output accuracy. Use Value: Independent soft-start ramps allow controlled voltage slew rates; ±10% PGOOD window validates output stability before test initiation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7841IUFD#TRPBF | Synchronous rectification support; integrated gate drivers optimized for low-RDS(ON) MOSFETs; no hiccup mode (latch-off only). | Better efficiency at medium loads (>1A); unsuitable where hiccup-mode fault recovery is required for intermittent shorts. | Select LTC7841IUFD#TRPBF when synchronous operation and higher light-load efficiency outweigh need for auto-retry protection. |
| LM5122MMX/NOPB | Single-channel, 65V max input; no dual-phase capability; fixed 1.215V reference (±1.5%); no ILIM programming current. | Requires two ICs for dual output; lacks channel-to-channel tracking and interleaving benefits; lower integration. | Choose LM5122MMX/NOPB only for cost-sensitive, lower-power single-output designs where dual-phase advantages are unnecessary. |
Compared with LTC7841IUFD#TRPBF, the LTC7840IUFD#TRPBF prioritizes robustness over peak efficiency via hiccup-mode protection and nonsynchronous flexibility; versus LM5122MMX/NOPB, it delivers true dual-phase integration, tighter reference tolerance, and hardware-programmable protection thresholds - reducing BOM count and improving system-level reliability.
Availability
LTC7840IUFD#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial high-voltage bias supplies, and automotive ADAS camera power systems requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade compliance.
Supply support for LTC7840IUFD#TRPBF 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 (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LTC7840IUFD#TRPBF belongs to ADI's Power by Linear™ controller family, engineered for high-input-voltage, high-step-up DC/DC conversion in harsh environments where reliability, thermal resilience, and flexible topology support are critical.
FAQ
What is the maximum input voltage rating for the LTC7840IUFD#TRPBF?
The LTC7840IUFD#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pin, with recommended continuous operation up to 60V. This allows robust handling of automotive load-dump transients and industrial power surges while maintaining full functionality across its –40°C to +125°C operating junction temperature range.
How does the hiccup-mode overcurrent protection work in the LTC7840IUFD#TRPBF?
The LTC7840IUFD#TRPBF enters hiccup mode when current limit is exceeded: it disables switching, waits for a timeout set by the SS1/SS2 capacitor value, then attempts restart. This cycle repeats until fault clears. Unlike latch-off, hiccup mode prevents thermal runaway during sustained shorts while enabling automatic recovery - a key safety feature in telecom and industrial systems.
Can the LTC7840IUFD#TRPBF be used in SEPIC or flyback topologies?
Yes, the LTC7840IUFD#TRPBF is explicitly designed for topology flexibility: its current-mode architecture and gate drive configuration support boost, SEPIC, and flyback implementations. External component reconfiguration - including transformer/coupled inductor selection and feedback network adjustment - enables reuse of the same LTC7840IUFD#TRPBF across these non-isolated and isolated topologies.
What is the purpose of the DMAX and BLANK pins on the LTC7840IUFD#TRPBF?
The DMAX pin sets the maximum duty cycle (75–96%) to limit boost ratio and prevent instability at extreme VIN/VOUT conditions; the BLANK pin configures minimum on-time (120–200ns) to ensure reliable MOSFET switching at high frequencies or high step-up ratios. Both are voltage-controlled analog inputs - no digital interface required.
Does the LTC7840IUFD#TRPBF require external power supplies for its internal LDOs?
No - the LTC7840IUFD#TRPBF integrates two self-powered LDOs: DRVCC (10V) is powered from VIN, and INTVCC (3.8V) is powered from DRVCC. External biasing of DRVCC or INTVCC is prohibited and may cause catastrophic failure due to internal body diode conduction; each must be bypassed locally with specified ceramic capacitors.
LTC7840IUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- PWM
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 5.5V ~ 60V
- Frequency - Switching:
- 50kHz ~ 425kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC7840IUFD#TRPBF FAQ
1.How can I place an order for LTC7840IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7840IUFD#TRPBF 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 LTC7840IUFD#TRPBF reliable?
The price and inventory of LTC7840IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7840IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7840IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7840IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7840IUFD#TRPBF?
LTC7840IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7840IUFD#TRPBF 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 LTC7840IUFD#TRPBF?
For technical support, including LTC7840IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7840IUFD#TRPBF requirements.
6.How does Aetrix verify that LTC7840IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7840IUFD#TRPBF 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 LTC7840IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7840IUFD#TRPBF?
All LTC7840IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7840IUFD#TRPBF, 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 LTC7840IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7840IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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