My Inquiry
My Account
Analog Devices Inc. LTC7840IFE#TRPBF
- Part No.:
- LTC7840IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7840IFE#TRPBF.pdf
- Description:
- DUAL PHASE/OUTPUT NON-SYNCH BOOS
- Quantity:
- Payment:
- Shipping:
Inventory:3,840
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7840IFE#TRPBF from Analog Devices is a dual-phase, dual-output nonsynchronous boost controller driving 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 telecom power supplies delivering up to 240V output.
For engineers reviewing the LTC7840IFE#TRPBF datasheet, LTC7840IFE#TRPBF pinout, LTC7840IFE#TRPBF application, or LTC7840IFE#TRPBF equivalent, key selection considerations include dual-phase current-mode control with dynamic slope recovery, independent RUN/PGOOD per channel, adjustable max duty cycle (75–96%), 10V gate driver LDO, and thermal performance in TSSOP-28 package at –40°C to 125°C.
Technical Context
The LTC7840IFE#TRPBF implements constant-frequency peak current mode control with smooth quadratic slope compensation and dynamic slope recovery to stabilize operation across wide duty cycles. Its two independent control loops operate 180° out-of-phase, each with dedicated ITH error amplifier output, VFB feedback input, RUN enable, PGOOD indicator, and ILIM current limit programming.
It integrates cascaded LDOs: a 10V DRVCC regulator (powered from VIN) for gate drivers and a 3.8V INTVCC regulator (powered from DRVCC) for analog/digital circuitry. Undervoltage lockout thresholds are 4.4V/3.9V for DRVCC and 3.3V/3.0V for INTVCC, ensuring robust startup and fault isolation under brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - accommodates automotive load dump, industrial surges, and telecom battery backup inputs without external pre-regulation. |
| Switching Frequency | 50kHz to 425kHz - programmable via FREQ pin voltage or synchronized externally; enables EMI optimization and magnetics size reduction. |
| Internal Reference | ±1% at 1.2V - ensures precise output voltage regulation across temperature and line/load variations in high-accuracy applications. |
| Max Duty Cycle | 75% to 96% - set by DMAX pin voltage (SGND/INTVCC/floating), enabling flexible boost ratio design from moderate to extreme voltage step-up. |
| Gate Driver Supply | 10V DRVCC LDO - powers N-channel MOSFET gates directly; includes UVLO (4.4V rising) to prevent weak turn-on and shoot-through during low-VIN events. |
| Current Sense Threshold | 70mV to 80mV - factory-trimmed maximum sense voltage; adjustable downward via ILIM pins to optimize current limit accuracy and noise immunity. |
| Min On-Time | 120ns to 200ns - selectable via BLANK pin (SGND/floating/INTVCC), critical for stable operation at high VIN/VOUT ratios and light loads. |
| Operating Temp Range | –40°C to 125°C - qualified for industrial and automotive under-hood environments; junction temp limit is 150°C with θJA = 30°C/W (TSSOP). |
Pinout & Package
The LTC7840IFE#TRPBF is packaged in a 28-lead thermally enhanced TSSOP (FE28) with exposed SGND pad for improved thermal dissipation. Pin pitch is 0.65mm; JEDEC MS-013AC compliant. Requires soldering of exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1 / RUN2 | Channel-enable inputs | 1.22V threshold with 80mV hysteresis; internal 1µA + 4.5µA pull-up enables direct microcontroller GPIO control without external bias. |
| VFB1 / VFB2 | Feedback inputs | Connect to resistor dividers on respective outputs; ±1% 1.2V reference sets regulation point; ±5nA bias current minimizes divider error. |
| ITH1 / ITH2 | Error amplifier outputs | Drive external RC compensation networks; voltage controls peak inductor current; slope-compensated for stability in continuous conduction mode. |
| GATE1 / GATE2 | High-side gate drivers | 10V CMOS outputs referenced to PGND; 2Ω pull-up / 1Ω pull-down RDS(ON) drives >50nC MOSFETs at 425kHz with minimal dead-time loss. |
| SENSE1+/– / SENSE2+/– | Differential current sense inputs | Accept Kelvin-connected sense resistors; reject common-mode noise; support bidirectional sensing for SEPIC/flyback configurations. |
| ILIM1 / ILIM2 | Current limit programming | 10µA sink sets max sense threshold; floating = 75mV; resistor-to-SGND scales threshold linearly down to <0.5V for precision OCP tuning. |
| DMAX / BLANK / FREQ / SS1 / SS2 | Configuration & timing | Resistor- or voltage-programmable: DMAX sets duty cap, BLANK sets min on-time, FREQ sets frequency, SS pins control soft-start ramp and hiccup timeout. |
| PGOOD1 / PGOOD2 | Open-drain status indicators | Pull low after 135µs mask timer when output enters ±10% regulation window; compatible with FPGA/CPLD power sequencing logic. |
| DRVCC / INTVCC / SGND / PGND | Power domains | DRVCC (10V) powers gates; INTVCC (3.8V) powers control logic; SGND (signal) and PGND (power) must be separated and joined only at single-point star ground. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase 180° interleaving | Reduces input/output ripple current by ~70% vs single-phase, enabling smaller input capacitors and lower EMI filter cost in high-power boost designs. |
| Hiccup-mode overcurrent protection | Auto-retries after fault clearance; prevents thermal runaway during sustained overload or short-circuit without requiring manual reset or external latch. |
| Flexible topology support | Configurable as dual-output boost, dual-phase single-output boost, SEPIC, or flyback - reuses same IC across multiple power architectures with minimal BOM change. |
| Independent channel control | Separate RUN, PGOOD, VFB, ITH, and ILIM per channel allows asymmetric output voltages (e.g., 48V + 240V), staggered start-up, and independent fault management. |
| Programmable minimum on-time | 120ns/160ns/200ns selection via BLANK pin enables stable operation at high VIN/VOUT ratios (e.g., 12V→240V) where duty cycle approaches 96%. |
| Integrated cascaded LDOs | Eliminates need for external bias rails: 10V DRVCC powers gate drivers; 3.8V INTVCC powers control logic - simplifies layout and improves startup reliability. |
Applications
| Telecom Power Supply | Industrial High-Voltage Bias |
|---|---|
Use Scenario: Generating isolated 48V and 240V rails from 12V–60V battery or rectified AC input in central office equipment. IC Role / Device Role / Timing Role: Dual-output boost controller managing two independent regulated outputs with phase interleaving to reduce input capacitor stress. Use Value: Enables compact, efficient multi-rail power architecture with <1% output regulation error and hiccup-mode protection against line faults. | Use Scenario: Providing stable 200V+ bias voltage for industrial sensors, piezoelectric actuators, or HV amplifiers in factory automation systems. IC Role / Device Role / Timing Role: High-ratio boost controller operating in continuous conduction mode with programmable 120ns min on-time for reliable startup at 5.5V input. Use Value: Delivers >92% efficiency at 240V/0.7A output from 12V input while maintaining thermal margin in sealed enclosures. |
| Automotive LED Driver | Test Equipment Power Module |
Use Scenario: Driving high-brightness LED strings in commercial vehicle lighting with input ranging from cold-crank 5.5V to load-dump 60V. IC Role / Device Role / Timing Role: Nonsynchronous boost controller with dual-phase operation to minimize EMI and meet CISPR-25 Class 5 requirements. Use Value: Achieves <100mVpp output ripple and fast transient response (<50µs) due to independent ITH loop compensation per channel. | Use Scenario: Programmable high-voltage supply module in automated test equipment requiring precise, sequenced outputs up to 240V. IC Role / Device Role / Timing Role: Configurable dual-output controller supporting both boost and SEPIC modes for universal lab-grade output flexibility. Use Value: Enables software-controlled voltage ramping (via SS pins), overvoltage lockout (8.5–12.5%), and power-good confirmation for safe DUT interfacing. |
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 |
|---|---|---|---|
| LTC7841IFE#TRPBF | Synchronous boost controller with integrated gate drivers; supports higher efficiency at low VIN but requires external bootstrap diodes for high-side FETs. | Better suited for 5V–36V input range; not rated for 60V max VIN; lacks hiccup mode - uses latched shutdown instead. | Select when efficiency >94% at light loads is critical and input voltage stays below 36V; avoid for 48V telecom or 60V surge-prone systems. |
| LM5122MH/NOPB | Single-channel, wide-input (3V–65V) boost controller with integrated 10V gate driver; no dual-phase or second output capability. | Requires two ICs for dual-output; no channel interleaving; fixed 100kHz–750kHz frequency range without hiccup mode. | Choose for cost-sensitive single-rail designs where board space permits duplication; not suitable for phase-interleaved ripple reduction or independent channel control. |
Compared with LTC7841IFE#TRPBF and LM5122MH/NOPB, the LTC7840IFE#TRPBF uniquely combines dual-phase nonsynchronous operation, 60V absolute max input rating, hiccup-mode protection, and full configurability across boost/SEPIC/flyback - making it optimal for high-reliability, high-voltage industrial and telecom power systems where thermal margin and fault resilience are prioritized over peak efficiency.
Availability
LTC7840IFE#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial high-voltage bias generators, and automotive LED driver systems requiring stable component supply and long-term production continuity.
Supply support for LTC7840IFE#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 industrial, automotive, communications, and healthcare markets.
The LTC7840IFE#TRPBF belongs to ADI's Power by Linear™ controller family, designed specifically for high-voltage, high-efficiency DC-DC conversion in harsh environments where wide input range, thermal robustness, and fault tolerance are essential.
FAQ
What is the maximum input voltage rating for the LTC7840IFE#TRPBF?
The LTC7840IFE#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pin, with recommended continuous operation from 5.5V to 60V. This wide range accommodates automotive load-dump transients and industrial power surges without external clamping, making the LTC7840IFE#TRPBF suitable for demanding high-voltage applications.
Does the LTC7840IFE#TRPBF support synchronous rectification?
No, the LTC7840IFE#TRPBF is a nonsynchronous boost controller and does not support synchronous rectification. It drives external N-channel MOSFETs in the high-side switch position with external catch diodes. For synchronous operation, consider the pin-compatible LTC7841IFE#TRPBF, which integrates high-side gate drivers and supports bootstrap-based synchronous FET control - though with reduced max VIN rating.
How is the switching frequency programmed on the LTC7840IFE#TRPBF?
The switching frequency of the LTC7840IFE#TRPBF is programmed via the FREQ pin, which sources a precise 10µA current. A resistor from FREQ to SGND sets the oscillator frequency from 50kHz to 425kHz; alternatively, a DC voltage applied to FREQ directly adjusts frequency. The LTC7840IFE#TRPBF also supports external synchronization from 50kHz to 450kHz via the SYNC pin with integrated PLL.
What is the purpose of the DMAX and BLANK pins on the LTC7840IFE#TRPBF?
The DMAX pin sets the maximum duty cycle (75%, 84%, or 96%) by connecting to INTVCC, floating, or SGND respectively; this prevents instability at extreme boost ratios. The BLANK pin configures minimum on-time (120ns, 160ns, or 200ns) to ensure reliable MOSFET turn-on under high-VIN/high-VOUT conditions. Both pins provide critical timing guardbands for the LTC7840IFE#TRPBF in high-ratio applications.
Can the LTC7840IFE#TRPBF be used in SEPIC or flyback topologies?
Yes, the LTC7840IFE#TRPBF is explicitly designed for flexible topology implementation including SEPIC and flyback, in addition to standard boost. Its dual-channel architecture, independent current sensing, and programmable timing parameters allow reconfiguration via external component changes - no firmware or hardware revision required. This makes the LTC7840IFE#TRPBF ideal for multi-platform power designs where topology reuse reduces qualification effort.
LTC7840IFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LTC7840IFE#TRPBF FAQ
1.How can I place an order for LTC7840IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7840IFE#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 LTC7840IFE#TRPBF reliable?
The price and inventory of LTC7840IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7840IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7840IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7840IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7840IFE#TRPBF?
LTC7840IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7840IFE#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 LTC7840IFE#TRPBF?
For technical support, including LTC7840IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7840IFE#TRPBF requirements.
6.How does Aetrix verify that LTC7840IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7840IFE#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 LTC7840IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7840IFE#TRPBF?
All LTC7840IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7840IFE#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 LTC7840IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7840IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7840IFE#TRPBF 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…
