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Analog Devices Inc. LTC7840HUFD#TRPBF
- Part No.:
- LTC7840HUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7840HUFD#TRPBF.pdf
- Description:
- DUAL PHASE/OUTPUT NON-SYNCH BOOS
- Quantity:
- Payment:
- Shipping:
Inventory:4,486
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Product details
Overview
LTC7840HUFD#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 industrial 240V boost supplies and telecom power shelves.
For engineers reviewing the LTC7840HUFD#TRPBF datasheet, LTC7840HUFD#TRPBF pinout, LTC7840HUFD#TRPBF application, or LTC7840HUFD#TRPBF equivalent, key selection criteria include its 28-pin QFN (4mm × 5mm) package, dual independent current-mode control loops, 10V DRVCC gate driver LDO, adjustable max duty cycle (75–96%), and phase-delayed 180° dual-channel operation for ripple reduction.
Technical Context
The LTC7840HUFD#TRPBF implements peak current mode control with dynamic slope compensation and smooth quadratic ramp recovery per channel. Its two independent control loops operate 180° out-of-phase, sharing no internal coupling except for synchronized clock generation via FREQ/SYNC pins.
It integrates cascaded LDOs: a 10V DRVCC regulator (powered from VIN, 100mA capable) for gate drivers, and a 3.8V INTVCC regulator (powered from DRVCC) for analog/digital circuitry. Both feature undervoltage lockout (DRVCC UVLO = 4.4V rising; INTVCC UVLO = 3.3V rising), and neither supports external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - accommodates automotive load dump, industrial surges, and wide-range DC inputs without pre-regulation. |
| Switching Frequency | 50kHz to 425kHz - programmable via FREQ pin voltage or synchronizable to external clock (50–450kHz), enabling EMI optimization and multi-phase coordination. |
| Internal Reference | ±1% at 1.2V - enables precise output regulation across temperature and line/load variations in high-accuracy boost applications. |
| Max Duty Cycle | 75% (DMAX = INTVCC), 84% (DMAX = float), 96% (DMAX = SGND) - configurable per design trade-off between voltage gain and minimum on-time constraints. |
| Min On-Time | 120ns (BLANK = SGND), 160ns (BLANK = float), 200ns (BLANK = INTVCC) - sets practical lower limit on achievable output voltage at high input-to-output ratios. |
| Gate Driver Supply | 10V DRVCC LDO - powers external N-MOSFET gates directly; includes 4.4V UVLO to prevent weak turn-on during brownout. |
| Current Sense Threshold | 75mV typical (ILIM pins floating) - defines peak inductor current limit; adjustable down to ≤70mV via ILIM1/ILIM2 resistors. |
Pinout & Package
The LTC7840HUFD#TRPBF is housed in a 28-lead plastic QFN package (4mm × 5mm, UFD28), thermally enhanced with exposed SGND pad requiring PCB soldering. Pin pitch is 0.5mm; JEDEC MO-220 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BLANK (Pin 26) | Minimum on-time programming | Sets nominal min on-time to 120/160/200ns via SGND/float/INTVCC connection - critical for high-VOUT/low-VIN operation. |
| GATE1/GATE2 (Pins 18/16) | N-MOSFET gate drive outputs | 10V, low-RDS(ON) (2Ω pull-up / 1Ω pull-down) outputs referenced to PGND - drive high-side boost switches directly. |
| SENSE1+/SENSE2+ (Pins 25/11) | Current sense positive inputs | Accept differential voltage across external sense resistors - enable per-channel peak current limiting and slope compensation. |
| VFB1/VFB2 (Pins 4/9) | Feedback inputs | Connect to resistor dividers on each output - close servo loop using ±1% 1.2V internal reference for tight regulation. |
| RUN1/RUN2 (Pins 6/7) | Independent enable inputs | 1.22V threshold with 80mV hysteresis - allow staggered startup, fault isolation, or channel disable in redundant systems. |
| PGOOD1/PGOOD2 (Pins 15/14) | Open-drain power-good indicators | Assert low after 135µs mask timer when output is within ±10% of target - provide sequenced system monitoring and fault signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase 180° interleaving | Reduces input/output ripple current by ~70% vs single-phase, lowering capacitor RMS current and size in high-power boost designs. |
| Hiccup-mode overcurrent protection | Disables switching and retries after soft-start timeout upon sustained overcurrent - prevents thermal runaway while preserving system recoverability. |
| Configurable topology support | Validated for boost, SEPIC, and flyback configurations via external component re-routing - extends reuse across isolated/non-isolated HV applications. |
| Adjustable soft-start ramp rate | 10µA internal current charges SS1/SS2 capacitors - enables controlled inrush limiting and coordinated multi-rail sequencing. |
| Phase-lockable oscillator | FREQ pin accepts DC voltage or external SYNC clock (50–450kHz) - allows deterministic timing alignment across multiple LTC7840HUFD#TRPBF controllers in modular power systems. |
Applications
| Industrial High-Voltage Power Supplies | Telecom Rectifier Modules |
|---|---|
Use Scenario: Generating 240V DC from 12–48V battery or rectified AC bus in factory automation PLCs and motor drives. IC Role / Device Role / Timing Role: Dual-phase nonsynchronous boost controller managing two independent 120V output stages in interleaved 180° configuration. Use Value: Achieves >90% efficiency at 0.7A output with reduced input capacitor stress and lower EMI versus single-phase alternatives. | Use Scenario: Front-end DC/DC stage in 48V telecom rectifier shelves delivering regulated -54V or +54V to distributed power architecture. IC Role / Device Role / Timing Role: Dual-output controller regulating separate positive and negative rails using boost and inverting SEPIC topologies. Use Value: Enables independent rail control, fast transient response, and hiccup-mode fault containment without sacrificing footprint. |
| Automotive 48V Mild Hybrid Systems | Test Equipment High-Voltage Sources |
Use Scenario: Boosting 12V/48V vehicle battery to 200–300V for active suspension actuators or onboard chargers. IC Role / Device Role / Timing Role: Dual-phase boost controller operating across –40°C to +150°C junction range with robust UVLO and thermal protection. Use Value: Meets AEC-Q100 Grade H qualification requirements; 60V max input handles load-dump transients up to ISO 7637-2 Pulse 5a. | Use Scenario: Programmable HV source in automated test equipment requiring stable 100–400V outputs with remote sensing and sequencing. IC Role / Device Role / Timing Role: Precision-controlled dual-output boost IC with ±1% VREF, dual PGOOD, and SYNC-capable frequency locking. Use Value: Supports accurate calibration traceability and synchronized multi-channel stimulus generation without external timing ICs. |
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 boost architecture with integrated bottom-FET drivers; 3.1V–40V input; no hiccup mode; 100kHz–1MHz fSW. | Better efficiency at medium loads due to synchronous rectification; unsuitable for >40V input or hiccup-based fault containment. | Select LTC7841IUFD#TRPBF only when input <40V and efficiency >92% at 1A is required; LTC7840HUFD#TRPBF remains preferred for >40V or hiccup-critical systems. |
| TPS40101PWPR | Single-channel, nonsynchronous boost controller; 4.5V–60V input; 50kHz–1MHz fSW; no dual-phase or interleaving capability. | Requires two units and external phase synchronization for dual-output; lacks dual RUN/PGOOD and hiccup mode. | Choose TPS40101PWPR for cost-sensitive single-rail designs where interleaving is unnecessary; LTC7840HUFD#TRPBF provides integrated dual-channel control and reliability features. |
Compared with LTC7841IUFD#TRPBF and TPS40101PWPR, the LTC7840HUFD#TRPBF uniquely combines 60V input tolerance, hiccup-mode protection, and native dual-phase 180° interleaving in a single QFN package - making it optimal for high-reliability, high-voltage, dual-rail industrial and automotive boost converters.
Availability
LTC7840HUFD#TRPBF is available at Aetrix Electronics and suitable for industrial high-voltage power supplies, telecom rectifier modules, and automotive 48V mild hybrid systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 qualified operation.
Supply support for LTC7840HUFD#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC7840HUFD#TRPBF belongs to ADI's Power by Linear™ controller family, designed specifically for high-input-voltage, high-reliability DC/DC conversion in harsh environments - emphasizing robust fault handling, wide temperature operation, and flexible topology support.
FAQ
What is the maximum input voltage rating for the LTC7840HUFD#TRPBF?
The LTC7840HUFD#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pin, with guaranteed operation across 5.5V to 60V. This enables use in automotive load-dump scenarios and industrial 48V systems where transient spikes exceed nominal rail voltage. The device incorporates internal protection to sustain brief 65V events without latch-up or damage, provided layout follows recommended grounding and decoupling practices.
Does the LTC7840HUFD#TRPBF support synchronous rectification?
No, the LTC7840HUFD#TRPBF is a nonsynchronous boost controller and does not support synchronous rectification. It drives external high-side N-channel MOSFETs only, relying on external diodes for freewheeling. For synchronous operation, consider the pin-compatible LTC7841IUFD#TRPBF - which integrates bottom-FET drivers but limits input to 40V and omits hiccup-mode protection.
How is the switching frequency set on the LTC7840HUFD#TRPBF?
The LTC7840HUFD#TRPBF switching frequency is set either by applying a DC voltage to the FREQ pin (10µA sink current; 50kHz–425kHz range) or by connecting an external clock (50kHz–450kHz) to the SYNC pin. The internal oscillator locks to the external signal with integrated PLL compensation - no external loop components required. Frequency accuracy is ±10% over temperature and line, with typical nominal value of 185kHz at VFREQ = 1.03V.
What is the purpose of the BLANK pin on the LTC7840HUFD#TRPBF?
The BLANK pin on the LTC7840HUFD#TRPBF programs the minimum on-time of each channel's power switch: 120ns (BLANK = SGND), 160ns (BLANK = float), or 200ns (BLANK = INTVCC). This blanking time prevents false current-sense triggering during MOSFET turn-on transitions, especially critical in high-duty-cycle or high-frequency operation where gate drive ringing could corrupt sensing.
Can the LTC7840HUFD#TRPBF be used in SEPIC or flyback topologies?
Yes, the LTC7840HUFD#TRPBF is explicitly validated for SEPIC and flyback configurations per its datasheet. Its nonsynchronous architecture, independent current sensing per channel, and flexible feedback structure allow reconfiguration by relocating external components - e.g., moving the transformer/coupled inductor and adjusting feedback divider placement - without firmware or pin changes. Application circuits for both topologies are provided in the official datasheet.
LTC7840HUFD#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC7840HUFD#TRPBF FAQ
1.How can I place an order for LTC7840HUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7840HUFD#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 LTC7840HUFD#TRPBF reliable?
The price and inventory of LTC7840HUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7840HUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7840HUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7840HUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7840HUFD#TRPBF?
LTC7840HUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7840HUFD#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 LTC7840HUFD#TRPBF?
For technical support, including LTC7840HUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7840HUFD#TRPBF requirements.
6.How does Aetrix verify that LTC7840HUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7840HUFD#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 LTC7840HUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7840HUFD#TRPBF?
All LTC7840HUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7840HUFD#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 LTC7840HUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7840HUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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