My Inquiry
My Account
Analog Devices Inc. LTC7840HFE#PBF
- Part No.:
- LTC7840HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7840HFE#PBF.pdf
- Description:
- DUAL PHASE/OUTPUT NON-SYNCH BOOS
- Quantity:
- Payment:
- Shipping:
Inventory:1,461
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7840HFE#PBF 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, hiccup-mode overcurrent protection, and supports boost, SEPIC, and flyback topologies - used in automotive 48V systems and industrial high-voltage power supplies.
For engineers reviewing the LTC7840HFE#PBF datasheet, LTC7840HFE#PBF pinout, LTC7840HFE#PBF application, or LTC7840HFE#PBF equivalent, key selection factors include its dual-channel phase-controlled operation, 180° channel-to-channel phase delay, adjustable max duty cycle (75–96%), dual RUN/PGOOD pins for independent channel control, and thermal-rated –40°C to 150°C junction operation in TSSOP-28 package.
Technical Context
The LTC7840HFE#PBF implements constant-frequency peak current mode control with dynamic slope compensation and smooth quadratic ramp recovery. Its two independent control loops feature separate ITH error amplifier outputs, VFB feedback inputs, RUN enable pins, and PGOOD indicators - enabling precise tracking and independent regulation of two output rails.
It integrates cascaded LDOs: a 10V DRVCC regulator (for gate drivers, UVLO threshold 4.4V rising) powered from VIN, and a 3.8V INTVCC regulator (for analog/digital circuitry, UVLO threshold 3.3V rising) powered from DRVCC. Both LDOs require dedicated local bypassing and must not be externally biased.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - accommodates automotive load dump surges and industrial wide-input systems without pre-regulation. |
| Switching Frequency | 50kHz to 425kHz - programmable via FREQ pin voltage or synchronized to external clock (50–450kHz), enabling EMI optimization and magnetics sizing. |
| Feedback Reference | 1.2V ±1% - high-accuracy internal reference ensures stable output regulation across temperature and line/load variations. |
| Max Duty Cycle | 75% to 96% - set by DMAX pin voltage (SGND=96%, INTVCC=75%), allowing flexible boost ratio design for varying VIN/VOUT requirements. |
| Min On-Time | 120ns to 200ns - selectable via BLANK pin (SGND=120ns, INTVCC=200ns), critical for high-VIN, low-duty-cycle operation at high frequencies. |
| Operating Junction Temp | –40°C to 150°C - H-grade qualification enables use in under-hood automotive and high-ambient industrial environments. |
| Gate Driver Output | 10V DRVCC with 2Ω pull-up / 1Ω pull-down - drives high-side N-MOSFETs directly with sufficient gate voltage margin for RDS(on) optimization at 10V VGS. |
Pinout & Package
The LTC7840HFE#PBF is housed in a 28-lead thermally enhanced TSSOP package (FE28) with exposed SGND pad (Pin 29), θJA = 30°C/W. Pin pitch is 0.65mm; SGND and PGND are isolated signal/power ground domains requiring separate PCB copper pours.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1, RUN2 (Pins 9, 10) | Independent channel enable inputs | 1.22V threshold with 80mV hysteresis; each has 1µA + 4.5µA pull-up - allows staggered startup or fault-isolated shutdown per channel. |
| VFB1, VFB2 (Pins 7, 12) | Output voltage feedback inputs | Connect to resistor divider midpoints; ±1% 1.2V reference sets regulation point - enables precise dual-rail tracking or independent setpoints. |
| ITH1, ITH2 (Pins 8, 13) | Error amplifier output / current sense threshold | Drives current comparator trip level; compensation network connects here - determines loop stability and transient response. |
| GATE1, GATE2 (Pins 21, 19) | High-side N-MOSFET gate drivers | 10V push-pull outputs referenced to PGND - drive external MOSFETs without level-shifting; support parallel FET configurations. |
| SENSE1+, SENSE1− (Pins 28, 27) SENSE2+, SENSE2− (Pins 14, 15) | Differential current sense inputs | Measure source-side sense resistor voltage drop; 75mV default max threshold (ILIM pins float) - enables accurate peak-current limiting per channel. |
| PGOOD1, PGOOD2 (Pins 18, 17) | Open-drain power-good indicators | Assert low after 135µs mask timer when output is within ±10% of target - provides sequenced system enable or fault signaling per rail. |
| DMAX (Pin 4), BLANK (Pin 1) | Configurable timing control | DMAX sets max duty cycle (96%/84%/75%); BLANK selects min on-time (120/160/200ns) - critical for high-VIN, high-frequency designs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase 180° interleaving | Reduces input/output ripple current by ~70% vs single-phase, lowering capacitor stress and EMI filter size. |
| Hiccup-mode overcurrent protection | Auto-retries after fault clearance using SS1/SS2 capacitor timing - prevents thermal runaway during sustained overload or short-circuit events. |
| Flexible topology support | Configurable as dual-output, dual-phase single-output, SEPIC, or flyback - reuses same IC across multiple converter architectures. |
| Independent channel RUN/PGOOD | Enables asymmetric startup sequencing, rail-specific fault isolation, and redundant power monitoring in safety-critical systems. |
| Thermally robust H-grade rating | Guaranteed operation to 150°C junction temperature - validated for under-hood automotive and high-ambient industrial deployments. |
Applications
| Automotive 48V Mild Hybrid Systems | Industrial High-Voltage DC Power Supplies |
|---|---|
Use Scenario: Boosting 12V/48V battery rails to 200–400V for e-turbo, active suspension, or 48V-to-400V DC-DC stages. IC Role / Device Role / Timing Role: Dual-phase nonsynchronous boost controller managing two parallel high-voltage boost stages with interleaved timing. Use Value: 180° phase shift cuts input capacitor RMS current by >50%, extending lifetime in harsh thermal environments. | Use Scenario: Generating stable 240V output from 9–24V industrial input for PLC I/O modules, motor drives, or test equipment. IC Role / Device Role / Timing Role: Dual-output controller regulating independent 48V and 240V rails from shared input, with separate RUN/PGOOD for system-level sequencing. Use Value: Independent feedback loops and hiccup-mode protection ensure one rail fault does not disrupt the other - improving system uptime. |
| Telecom Intermediate Bus Converters | Medical Imaging Power Subsystems |
Use Scenario: Converting 48V telecom rectified input to 240V intermediate bus for downstream isolated converters in base station RF amplifiers. IC Role / Device Role / Timing Role: Dual-phase single-output boost controller delivering high-efficiency, low-noise 240V with programmable 150kHz–300kHz switching. Use Value: Adjustable frequency and soft-start current ramping minimize inrush and meet strict EMI Class B limits without oversized filters. | Use Scenario: Powering X-ray detector bias supplies and high-voltage sensor interfaces requiring tightly regulated dual outputs (e.g., ±12V and +200V). IC Role / Device Role / Timing Role: Dual-output controller with independent VFB/ITH paths enabling precise tracking between positive and negative rails or asymmetrical outputs. Use Value: ±1% reference and 10µA soft-start current ensure <±0.5% output deviation during warm-up - critical for image fidelity. |
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#PBF | Synchronous boost architecture with integrated bottom-FET drivers; no external diode required; higher efficiency at light loads. | Requires synchronous rectifier layout; not drop-in compatible due to different pinout and gate drive configuration. | Select when >95% efficiency at 10–100% load range is mandatory and board space permits synchronous layout. |
| LTC3895HFE#PBF | Single-phase, wide-VIN (4–60V) controller with integrated 10V gate driver; lacks dual-channel interleaving and second PGOOD. | Lower cost and simpler layout for single-rail systems; cannot replace dual-phase ripple reduction or independent rail control. | Select for cost-sensitive single-output applications where interleaving and dual-rail monitoring are unnecessary. |
Compared with LTC7841HFE#PBF, the LTC7840HFE#PBF offers lower component count and higher voltage capability in nonsynchronous mode but requires external diodes; compared with LTC3895HFE#PBF, it provides true dual-channel control and phase interleaving at the expense of higher pin count and complexity.
Availability
LTC7840HFE#PBF is available at Aetrix Electronics and suitable for automotive 48V systems, industrial high-voltage DC power supplies, and telecom intermediate bus converters requiring stable component supply with extended temperature reliability.
Supply support for LTC7840HFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7840 product line delivers high-voltage, multi-phase DC-DC controller solutions optimized for ruggedized power conversion in automotive, industrial, and telecom infrastructure where wide input range, thermal resilience, and dual-rail flexibility are essential.
FAQ
What is the maximum operating junction temperature for the LTC7840HFE#PBF?
The LTC7840HFE#PBF is rated for continuous operation up to 150°C junction temperature, verified across the full –40°C to 150°C ambient range. This H-grade qualification distinguishes it from E/I-grade variants (125°C max) and enables deployment in under-hood automotive and high-ambient industrial environments where thermal margins are constrained.
Can the LTC7840HFE#PBF be configured for SEPIC or flyback topologies?
Yes, the LTC7840HFE#PBF supports SEPIC and flyback configurations per its datasheet. Its nonsynchronous architecture, dual-channel gate drivers, and flexible feedback/sense architecture allow reconfiguration by modifying external component connections - no internal register changes required. Application Note AN178 details implementation guidelines for both topologies using LTC7840HFE#PBF.
How does the hiccup-mode overcurrent protection work on the LTC7840HFE#PBF?
The LTC7840HFE#PBF enters hiccup mode when either current sense channel exceeds its programmed threshold. It disables switching, waits for the SS1/SS2 capacitor to discharge below 0.5V (determined by internal 10µA pull-down), then attempts restart. This cycle repeats until fault clears - preventing thermal damage during sustained overloads while maintaining automatic recovery without external intervention.
What are the key differences between the FE (TSSOP) and UFD (QFN) packages for the LTC7840HFE#PBF?
The LTC7840HFE#PBF is only offered in the FE (28-lead TSSOP) package per Analog Devices' ordering matrix. The UFD variant exists for other grades (e.g., LTC7840HUFD#PBF) but is not available for the H-grade in TSSOP form. FE package features θJA = 30°C/W and 0.65mm pitch; UFD offers smaller footprint but higher thermal resistance (47°C/W) and 0.5mm pitch.
Does the LTC7840HFE#PBF require external components for gate driver biasing?
No - the LTC7840HFE#PBF integrates a 10V DRVCC LDO powered from VIN, eliminating need for external gate driver supplies. However, DRVCC must be bypassed to PGND with ≥4.7µF ceramic capacitor placed adjacent to Pin 22; failure to do so risks instability or UVLO-induced shutdown during high gate charge demand.
LTC7840HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC7840HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7840HFE#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 LTC7840HFE#PBF reliable?
The price and inventory of LTC7840HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7840HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7840HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7840HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7840HFE#PBF?
LTC7840HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7840HFE#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 LTC7840HFE#PBF?
For technical support, including LTC7840HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7840HFE#PBF requirements.
6.How does Aetrix verify that LTC7840HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7840HFE#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 LTC7840HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7840HFE#PBF?
All LTC7840HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7840HFE#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 LTC7840HFE#PBF part is unused and in its original packaging.
Return procedure for LTC7840HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7840HFE#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
