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Analog Devices Inc. LTC7840HFE#TRPBF
- Part No.:
- LTC7840HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7840HFE#TRPBF.pdf
- Description:
- DUAL PHASE/OUTPUT NON-SYNCH BOOS
- Quantity:
- Payment:
- Shipping:
Inventory:4,956
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Product details
Overview
LTC7840HFE#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, supports hiccup-mode overcurrent protection, and features two independent RUN pins and power-good indicators-used in automotive front-end supplies and industrial 240V boost stages.
For engineers reviewing the LTC7840HFE#TRPBF datasheet, LTC7840HFE#TRPBF pinout, LTC7840HFE#TRPBF application, or LTC7840HFE#TRPBF equivalent, key selection criteria include its –40°C to 150°C H-grade junction temperature rating, 1.2V ±1% internal reference, dual-channel current sense threshold adjustability via ILIM pins, and TSSOP-28 thermal performance (θJA = 30°C/W).
Technical Context
The LTC7840HFE#TRPBF implements peak current mode control with dynamic slope compensation and 180° phase interleaving across two independent boost channels. Each channel uses a dedicated error amplifier (EA), ITH control node, and current comparator referenced to a precise 1.2V internal voltage source.
Its cascaded LDO architecture powers gate drivers from a 10V DRVCC regulator (UVLO at 4.4V/3.9V) and control circuitry from a 3.8V INTVCC regulator (UVLO at 3.3V/3.0V). The DMAX and BLANK pins independently program maximum duty cycle (75–96%) and minimum on-time (120–200ns), enabling robust operation under wide VIN and transient load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - accommodates automotive cold-crank surges and industrial 48V bus transients without external pre-regulation. |
| Switching Frequency | 50kHz to 425kHz - programmable via FREQ pin current or synchronized externally; enables EMI optimization and inductor size reduction. |
| Internal Reference | 1.2V ±1% - ensures stable output regulation across temperature and line/load variations in precision high-voltage supplies. |
| Max Junction Temp | 150°C - H-grade qualification enables deployment in under-hood automotive modules and high-ambient industrial enclosures. |
| DRVCC Output | 10V ±0.4V - powers external high-side N-MOSFET gates directly; includes UVLO (4.4V rising) to prevent weak turn-on during brownout. |
| Current Sense Threshold | 75mV (ILIM pin floating) - sets peak inductor current limit; adjustable down to ≤70mV using external resistor for fine-tuned overcurrent protection. |
| Power Good Accuracy | ±10% window with 135µs delay - provides reliable system-level sequencing and fault reporting for downstream converters or microcontrollers. |
Pinout & Package
The LTC7840HFE#TRPBF is housed in a 28-lead thermally enhanced TSSOP package (FE28) with exposed SGND pad for PCB heat sinking. θJA = 30°C/W enables high-power boost operation without forced air cooling in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1 / RUN2 | Channel enable inputs | Independent 1.22V turn-on threshold with 80mV hysteresis; each pulls up 1.0µA (4.5µA active) - enables staggered startup and fault isolation. |
| VFB1 / VFB2 | Error amplifier feedback inputs | Connect to resistor dividers on respective outputs; referenced to 1.2V internal reference - determines regulated output voltage per channel. |
| ITH1 / ITH2 | Current control threshold nodes | EA output controlling peak inductor current; voltage increase raises trip point - enables loop compensation and current limiting. |
| GATE1 / GATE2 | High-side N-MOSFET gate drivers | 10V push-pull outputs referenced to PGND; RDS(ON) = 2Ω (pull-up), 1.0Ω (pull-down) - drives Qg up to ~50nC at 150kHz without external buffers. |
| SENSE1+/– / SENSE2+/– | Differential current sense inputs | Measure voltage across low-side sense resistors; reject common-mode noise up to INTVCC - enables accurate current-mode control in noisy environments. |
| ILIM1 / ILIM2 | Current limit programming pins | 10µA sink current; resistor-to-SGND sets max sense voltage (≤75mV) - allows precise, temperature-stable overcurrent threshold tuning. |
| DMAX | Maximum duty cycle control | SGND = 96%, float = 84%, INTVCC = 75% - prevents shoot-through and inductor saturation in high-VIN boost configurations. |
| BLANK | Minimum on-time setting | SGND = 120ns, float = 160ns, INTVCC = 200ns - suppresses false triggering during MOSFET switching transitions. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Pulled low when output enters ±10% regulation window after 135µs mask timer - interfaces directly with MCU reset or FPGA configuration logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaved operation | Reduces input/output ripple current by up to 50% versus single-phase, lowering capacitor stress and EMI filter size in 240V boost applications. |
| Hiccup-mode overcurrent protection | Automatically restarts after fault clearance - avoids thermal runaway during short-circuit events while maintaining system availability. |
| Configurable topology support | Validated for boost, SEPIC, and flyback configurations via external component re-routing - extends reuse across multiple power architectures. |
| Programmable soft-start ramp | 10µA internal current charges SS1/SS2 capacitors - prevents inrush current and output overshoot during power-up of high-capacitance loads. |
| Integrated 10V/3.8V dual-LDO supply | Eliminates need for external bias rails; DRVCC powers gate drivers, INTVCC powers analog/digital core - simplifies BOM and layout. |
Applications
| Automotive Front-End Supply | Industrial High-Voltage Boost |
|---|---|
|
Use Scenario: 12V battery-fed DC-DC converter generating 48V for ADAS camera modules and radar systems in engine compartments. IC Role / Device Role / Timing Role: Dual-phase boost controller regulating two independent outputs (e.g., 48V/3.3V) with phase interleaving to minimize input ripple. Use Value: H-grade 150°C operation survives under-hood ambient temperatures; hiccup mode protects against load dump-induced overcurrent faults. |
Use Scenario: Telecom rectifier upgrading -48V DC plant to +240V for fiber-optic line cards requiring isolated downstream conversion. IC Role / Device Role / Timing Role: Dual-output boost controller delivering 240V at 0.7A and auxiliary 36V rail, operating at 150kHz with external synchronization. Use Value: 60V max input withstands rectifier surge transients; ±1% reference ensures tight regulation across 4:1 output voltage range. |
| Medical Imaging Power Module | Test Equipment High-Voltage Source |
|
Use Scenario: Portable X-ray generator requiring stable 200V output from 24V lithium battery pack with minimal EMI emissions. IC Role / Device Role / Timing Role: Interleaved dual-phase boost controller driving discrete SiC MOSFETs; CLKOUT daisy-chains to secondary LTC7840 for 4-phase scaling. Use Value: Programmable frequency (50–425kHz) enables spread-spectrum operation; 180° phase shift reduces conducted EMI peaks by 6dB. |
Use Scenario: Bench power supply generating programmable 100–300V outputs for semiconductor parametric testing with fast transient response. IC Role / Device Role / Timing Role: Dual-output controller supporting independent soft-start (SS1/SS2) and tracking (external ramp) for multi-rail sequencing. Use Value: Two RUN pins allow independent channel enable/disable; dual PGOOD outputs interface with safety interlock circuits. |
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 |
|---|---|---|---|
| LTC7841HFE#TRPBF | Includes synchronous rectification capability; replaces external boost diodes with integrated N-MOSFET drivers; higher efficiency at light loads. | Requires redesign of power stage (no external diode); not drop-in compatible due to different gate drive timing and ILIM pin behavior. | Select when >92% full-load efficiency is required and board space permits synchronous MOSFET layout. |
| LM5122MH/NOPB | Single-channel, 65V-input boost controller; no dual-phase or hiccup-mode; fixed 1.2V reference (±1.5%); no ILIM pin adjustment. | Suitable only for single-output systems; lacks channel independence, PGOOD2, and dual RUN control needed for redundant or split-rail designs. | Choose for cost-sensitive, non-redundant 48V boost where dual-phase ripple reduction is unnecessary. |
Compared with LTC7841HFE#TRPBF, the LTC7840HFE#TRPBF trades synchronous efficiency for simpler diode-based power stage design and direct hiccup-mode fault handling; versus LM5122MH/NOPB, it adds critical redundancy features (dual PGOOD, independent RUN, interleaving) essential for mission-critical 240V industrial supplies.
Availability
LTC7840HFE#TRPBF is available at Aetrix Electronics and suitable for automotive front-end supplies, industrial high-voltage boost converters, and medical imaging power modules requiring stable component supply across extended temperature ranges.
Supply support for LTC7840HFE#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The LTC7840 product line delivers dual-phase, high-input-voltage boost controllers optimized for automotive, industrial, and telecom applications demanding reliability, thermal robustness, and flexible topology support beyond standard single-channel solutions.
FAQ
What is the maximum operating junction temperature for the LTC7840HFE#TRPBF?
The LTC7840HFE#TRPBF is rated for –40°C to 150°C junction temperature, confirmed by Analog Devices' H-grade qualification. This specification enables use in under-hood automotive environments and high-ambient industrial settings where standard E/I-grade parts would exceed thermal limits. Derating curves in the datasheet define safe operating area based on PCB copper area and airflow.
Can the LTC7840HFE#TRPBF be configured for single-output, dual-phase operation?
Yes, the LTC7840HFE#TRPBF supports both dual-output and dual-phase single-output configurations. In dual-phase mode, channels operate 180° out-of-phase using shared feedback (VFB1/VFB2 tied together) and synchronized clocking. This reduces input/output ripple and improves thermal distribution compared to single-phase designs.
How does the hiccup-mode overcurrent protection work in the LTC7840HFE#TRPBF?
The LTC7840HFE#TRPBF enters hiccup mode when current sense voltage exceeds the programmed threshold (e.g., 75mV with ILIM pins floating). It disables both gate drivers, waits for the SS1/SS2 capacitor to discharge below 0.5V, then attempts automatic restart. This cycle repeats until the fault clears, preventing thermal damage during sustained overloads.
What is the purpose of the DMAX and BLANK pins on the LTC7840HFE#TRPBF?
The DMAX pin sets maximum duty cycle (75–96%) to prevent inductor saturation and MOSFET shoot-through at high input voltages. The BLANK pin configures minimum on-time (120–200ns) to suppress false current-sense triggering during gate-drive transitions. Both pins use simple resistor-to-ground or rail connections for robust, temperature-stable timing control.
Does the LTC7840HFE#TRPBF require external components for its internal LDOs?
Yes, the LTC7840HFE#TRPBF requires external bypass capacitors: ≥4.7µF ceramic (X5R) from DRVCC to PGND, and 1nF ceramic from INTVCC to SGND. These must be placed adjacent to their respective pins. Connecting external supplies to DRVCC or INTVCC violates the LDO architecture and risks catastrophic failure due to body-diode conduction.
LTC7840HFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC7840HFE#TRPBF FAQ
1.How can I place an order for LTC7840HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7840HFE#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 LTC7840HFE#TRPBF reliable?
The price and inventory of LTC7840HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7840HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7840HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7840HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7840HFE#TRPBF?
LTC7840HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7840HFE#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 LTC7840HFE#TRPBF?
For technical support, including LTC7840HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7840HFE#TRPBF requirements.
6.How does Aetrix verify that LTC7840HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7840HFE#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 LTC7840HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7840HFE#TRPBF?
All LTC7840HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7840HFE#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 LTC7840HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7840HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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