My Inquiry
My Account
Analog Devices Inc. LTC3802EGN#TRPBF
- Part No.:
- LTC3802EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3802EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,255
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3802EGN#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down DC/DC controller optimized for high-efficiency conversion from 3V to 30V input. It features leading-edge modulation, 550kHz fixed-frequency operation (adjustable 330–750kHz), 180° out-of-phase channel control, programmable up/down tracking, and ±1% 0.6V reference-enabling tightly regulated 3.3V/15A and 2.5V/15A outputs in notebook power systems.
For engineers reviewing the LTC3802EGN#TRPBF datasheet, LTC3802EGN#TRPBF pinout, LTC3802EGN#TRPBF application, or LTC3802EGN#TRPBF equivalent, key selection criteria include dual-channel phase synchronization, line feedforward compensation for fast line transient response, external N-MOSFET architecture with integrated gate drivers, programmable current limit without sense resistor, and Burst Mode® operation for light-load efficiency.
Technical Context
The LTC3802EGN#TRPBF implements voltage-mode control with leading-edge PWM architecture-eliminating slope compensation and enabling stable low-duty-cycle operation down to near 0%. Its dual controllers share a master clock and operate 180° out of phase to halve input capacitor RMS current and reduce ESR-related losses.
Line feedforward compensation via VINFF pin directly modulates the PWM comparator input, bypassing the feedback loop to achieve <100µs line transient response. The FBT pin enables real-time servo-based output tracking during power-up/down, while PHASEMD selects PLL phase relationships (0°, 90°, or 180° offset relative to PLLIN).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V - supports wide-input industrial and battery-powered systems without pre-regulation. |
| Switching Frequency | 550kHz typical (330–750kHz programmable via PLLLPF) - balances efficiency, size, and EMI compliance in compact layouts. |
| Output Voltage Accuracy | ±1% at 0.6V reference - ensures tight regulation across temperature and load for multi-rail digital supplies. |
| Current Limit Programming | Programmable via single resistor on IMAX1/IMAX2 - eliminates external sense resistor and associated power loss. |
| Burst Mode® Threshold | Activates automatically below ~0.2A load - maintains >85% efficiency at light loads without external enable control. |
| Phase Relationship | 180° out-of-phase dual channels - reduces input ripple current by ~70%, allowing smaller input bulk capacitors. |
| Shutdown Current | <100µA - enables ultra-low-power standby in portable devices with long battery life requirements. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), exposed pad not present - suitable for standard reflow assembly and thermal management via PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVCC (Pin 1) | Driver power supply | Supplies gate drive for both BG1/BG2 drivers; must be ≥5V and bypassed with ≥10µF to PGND for robust MOSFET turn-on. |
| BG1 (Pin 2) | Channel 1 bottom gate driver | Drives source of low-side N-MOSFET QB1; capable of driving up to 10,000pF gate capacitance. |
| BOOST1 (Pin 3) | Channel 1 top gate bootstrap supply | Bootstrapped from SW1 via 0.1µF capacitor; enables full enhancement of high-side N-MOSFET QA1. |
| TG1 (Pin 4) | Channel 1 top gate driver | Swings PVCC above SW1 node; drives gate of QA1 with rail-to-rail swing for minimal conduction loss. |
| SW1 (Pin 5) | Channel 1 switching node | Connects to drain of QA1 and source of QB1; monitored for current limit and Burst Mode detection via internal comparators. |
| PGND (Pin 6) | Power ground return | High-current return path for BG drivers and external MOSFET sources; must be low-inductance connection near VIN/PVCC caps. |
| IMAX1 (Pin 7) | Channel 1 current limit set | Internal 10µA current source pulls up; resistor to SGND sets ILIM threshold without sense resistor or power loss. |
| FBT (Pin 8) | Feedback tracking input | Servos CMPIN2 during startup/shutdown to enforce precise voltage ramp rates between VOUT1 and VOUT2. |
| CMPIN1 (Pin 9) | Channel 1 real-time output monitor | Directly connected to VOUT1 divider; feeds PGOOD, overvoltage, and Burst reset comparators - requires noise-free routing. |
| COMP1 (Pin 10) | Channel 1 error amplifier output | Drives line feedforward circuit and PWM comparator; RC network to FB1 provides Type 3 compensation for stability. |
| FB1 (Pin 11) | Channel 1 feedback input | Virtual-ground node for resistive divider; sets output voltage as VOUT = 0.6V × (1 + R1/R2). |
| SGND (Pin 12) | Signal ground reference | Low-noise return for all analog circuitry (FB, COMP, RUN/SS); must be separated from PGND except at single-point tie near VIN cap. |
| FCB (Pin 13) | Force continuous mode | Short to GND disables Burst Mode - forces CCM operation regardless of load for predictable EMI and ripple behavior. |
| RUN/SS (Pin 14) | Soft-start and shutdown control | 7µA internal pull-up; external capacitor sets ramp rate and soft-start delay (~300ms/µF); <0.8V shuts down device. |
| PGOOD (Pin 15) | Open-drain power-good flag | Asserts low when either output deviates >±10% from setpoint or during shutdown - enables system sequencing and fault reporting. |
| VINFF (Pin 16) | Line feedforward compensation | Directly modulates PWM comparator to cancel line-induced duty cycle changes - improves line regulation to <0.1%/V. |
| PHASEMD (Pin 17) | Phase selector input | Floating = 0° TG1–PLLIN alignment; high = 90° lead; low = power-down tracking - configures PLL synchronization topology. |
| FB2 (Pin 18) | Channel 2 feedback input | Identical function to FB1; sets VOUT2 independently using separate resistive divider. |
| COMP2 (Pin 19) | Channel 2 error amplifier output | Same compensation structure as COMP1; allows independent loop tuning for asymmetric output configurations. |
| VCC (Pin 20) | Analog core supply | 5V ±10% supply for internal logic, references, and amplifiers; bypassed with ≥10µF to SGND for noise immunity. |
| CMPIN2 (Pin 21) | Channel 2 real-time output monitor | Feeds tracking servo (with FBT), PGOOD, and protection comparators - critical for coordinated dual-rail sequencing. |
| IMAX2 (Pin 22) | Channel 2 current limit set | Functionally identical to IMAX1; enables independent current limiting for asymmetric load requirements. |
| PLLLPF (Pin 23) | PLL low-pass filter | Accepts DC voltage (0–2.4V) to set oscillator frequency from 330–750kHz - enables precise EMI band placement. |
| PLLIN (Pin 24) | External sync input | Falling-edge triggered; synchronizes both channels to external clock - eliminates beat frequencies in multi-controller systems. |
| SW2 (Pin 25) | Channel 2 switching node | Same role as SW1; connects to QA2/QB2 junction - monitored identically for protection and mode control. |
| TG2 (Pin 26) | Channel 2 top gate driver | Functionally identical to TG1; drives QA2 with same timing and drive strength. |
| BOOST2 (Pin 27) | Channel 2 top gate bootstrap supply | Same bootstrapping scheme as BOOST1; ensures consistent high-side gate drive across both phases. |
| BG2 (Pin 28) | Channel 2 bottom gate driver | Same capability as BG1; drives QB2 with matched timing and sink/source strength. |
Key Features
| Feature | Design Value |
|---|---|
| Leading-edge modulation architecture | Enables stable operation at sub-5% duty cycles - essential for high-input/low-output conversion (e.g., 24V→1.2V). |
| 180° out-of-phase dual controllers | Reduces input capacitor RMS current by ~70% - cuts required bulk capacitance and lowers board area/cost. |
| Line feedforward compensation (VINFF) | Improves line transient response to <100µs with no loop compensation changes - simplifies design for variable-input systems. |
| Programmable up/down tracking (FBT) | Ensures monotonic power sequencing between rails - prevents latch-up or bus contention in multi-core processors. |
| Burst Mode® operation | Maintains >85% efficiency at 0.2A load - extends battery runtime in portable instruments without sacrificing light-load regulation. |
| Integrated 0.6V ±1% reference | Eliminates need for external reference IC - reduces BOM count and improves long-term drift performance vs. discrete solutions. |
Applications
| Notebook Power Delivery | Portable Instrument Supply |
|---|---|
Use Scenario: Dual-rail CPU/GPU core voltage generation (3.3V/15A and 2.5V/15A) from 5–22V adapter input in ultrabook platforms. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller providing phase-aligned, low-noise, high-efficiency DC/DC conversion with precise power sequencing. Use Value: 180° interleaving cuts input ripple current by 70%, enabling smaller 10µF ceramic input caps instead of 100µF tantalum - reducing solution size by 35%. | Use Scenario: Precision analog front-end and microcontroller supply in handheld test equipment operating from 3–30V Li-ion or AC adapter input. IC Role / Device Role / Timing Role: Dual-channel step-down controller delivering tightly regulated, tracked outputs with Burst Mode® for battery-saver operation. Use Value: ±1% reference and line feedforward deliver <0.1% line regulation - critical for 16-bit ADC accuracy under varying input conditions. |
| DC Power Distribution | Battery-Operated Digital Systems |
Use Scenario: Centralized 12V-to-5V/3.3V/2.5V conversion in industrial rack-mounted systems with distributed point-of-load requirements. IC Role / Device Role / Timing Role: High-voltage input dual-phase controller supporting wide VIN range and synchronized multi-rail generation. Use Value: 3–30V input range eliminates need for intermediate pre-regulators - simplifies architecture and improves overall system efficiency by 3–5%. | Use Scenario: Main system power for ruggedized tablets using 3S Li-ion (9–12.6V) input with dynamic load steps from 0.1A to 15A. IC Role / Device Role / Timing Role: Dual-phase buck controller with fast transient response and programmable current limit for reliable overcurrent protection. Use Value: Leading-edge modulation achieves <5µs load-step recovery time - prevents brownout during processor burst activity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855EUH#PBF | 32-pin QFN only; integrates MOSFET drivers with higher peak current (4A vs 2.2A); supports 500kHz–900kHz range. | Requires different layout due to QFN-only package and higher drive strength; better suited for higher-current (>20A) designs. | Select when higher gate drive current or wider frequency range is needed; not pin-compatible with LTC3802EGN#TRPBF. |
| TPS546D24RQFT | Single-chip 60A dual-phase controller with PMBus interface; includes telemetry, margining, and digital loop compensation. | Targets server/telecom with digital control requirements; lacks analog simplicity and Burst Mode® efficiency at ultra-light loads. | Select for digitally managed systems requiring remote monitoring; requires firmware integration and adds complexity for basic analog designs. |
Compared with LTC3855EUH#PBF and TPS546D24RQFT, the LTC3802EGN#TRPBF offers superior light-load efficiency via analog Burst Mode®, simpler analog loop compensation, and SSOP packaging for easier prototyping - making it optimal for cost-sensitive, high-efficiency portable and instrumentation applications where digital control is unnecessary.
Availability
LTC3802EGN#TRPBF is available at Aetrix Electronics and suitable for notebook power delivery, portable instrument supply, and DC power distribution systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3802EGN#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 acquired Linear Technology in 2017 and maintains its high-performance analog IC portfolio, emphasizing precision, power efficiency, and reliability for demanding industrial and communications applications.
The LTC3802EGN#TRPBF belongs to Linear's high-voltage synchronous buck controller product line, designed specifically for efficient, low-noise, multi-rail DC/DC conversion in space-constrained portable and instrumentation systems.
FAQ
What is the maximum input voltage supported by the LTC3802EGN#TRPBF?
The LTC3802EGN#TRPBF supports an absolute maximum input voltage of 30V on the VINFF pin and operates continuously from 3V to 30V. This wide input range enables direct use with unregulated 24V industrial rails or multi-cell Li-ion batteries without pre-regulation stages, simplifying system architecture and improving overall efficiency in the LTC3802EGN#TRPBF-based design.
How does the LTC3802EGN#TRPBF achieve precise power sequencing between its two output channels?
The LTC3802EGN#TRPBF uses the FBT pin to servo CMPIN2 during startup and shutdown, enforcing matched slew rates between VOUT1 and VOUT2. By connecting FBT to a resistive divider matching that on CMPIN2, the LTC3802EGN#TRPBF guarantees monotonic, ratiometric voltage ramps - preventing bus contention or latch-up in multi-core processors and FPGAs powered by the LTC3802EGN#TRPBF.
Can the LTC3802EGN#TRPBF operate with only one channel active?
Yes, the LTC3802EGN#TRPBF supports single-channel operation. Leaving PLLIN floating or grounded disables synchronization, allowing Channel 1 to run freely at 550kHz while Channel 2 remains functional but unsynchronized. Both channels retain independent feedback, current limit, and protection functions - enabling flexible configuration in the LTC3802EGN#TRPBF for partial-load or redundancy applications.
What is the purpose of the VINFF pin on the LTC3802EGN#TRPBF?
The VINFF pin on the LTC3802EGN#TRPBF provides line feedforward compensation by directly modulating the PWM comparator input in proportion to input voltage changes. This bypasses the feedback loop, reducing line transient response time to under 100µs and improving line regulation to ±0.1%/V - a critical feature for the LTC3802EGN#TRPBF in systems with variable input sources like automotive or adapter-powered equipment.
Does the LTC3802EGN#TRPBF require external current sense resistors for overcurrent protection?
No, the LTC3802EGN#TRPBF does not require external current sense resistors. It uses the voltage drop across the low-side MOSFET (monitored at SWx) combined with an internal 10µA current source on IMAX1/IMAX2 pins to set the current limit threshold. This eliminates sense resistor power loss and layout sensitivity, enhancing efficiency and simplifying design for the LTC3802EGN#TRPBF in high-current applications.
LTC3802EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 30V
- Frequency - Switching:
- 330kHz ~ 750kHz
- Duty Cycle (Max):
- 89%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3802EGN#TRPBF FAQ
1.How can I place an order for LTC3802EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3802EGN#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 LTC3802EGN#TRPBF reliable?
The price and inventory of LTC3802EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3802EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3802EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3802EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3802EGN#TRPBF?
LTC3802EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3802EGN#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 LTC3802EGN#TRPBF?
For technical support, including LTC3802EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3802EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3802EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3802EGN#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 LTC3802EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3802EGN#TRPBF?
All LTC3802EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3802EGN#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 LTC3802EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3802EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3802EGN#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…
