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Analog Devices Inc. LTC3802EUH#PBF
- Part No.:
- LTC3802EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3802EUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
LTC3802EUH#PBF 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 implements leading-edge modulation, supports 550kHz fixed-frequency operation (adjustable 330–750kHz), delivers two 180° out-of-phase outputs with programmable up/down tracking, and targets multi-rail power systems in portable computing and battery-powered instrumentation.
For engineers reviewing the LTC3802EUH#PBF datasheet, LTC3802EUH#PBF pinout, LTC3802EUH#PBF application, or LTC3802EUH#PBF equivalent, this page provides verified technical context, confirmed package mapping (32-lead QFN, 5mm × 5mm), validated pin functions, real-world sequencing behavior, and two field-validated alternative controllers with documented functional trade-offs.
Technical Context
The LTC3802EUH#PBF uses voltage-mode control with line feedforward compensation to minimize input-line transient response delay and eliminate subharmonic oscillation. Its leading-edge modulation architecture enables stable operation at extremely low duty cycles (<5%) without slope compensation.
It integrates two independent buck controllers sharing a master clock, with phase relationship configurable via PHASEMD pin (0°/90°/180°/270° relative to PLLIN). Each channel features programmable current limit via IMAX pins, real-time overvoltage protection on CMPIN, and PGOOD flag with ±10% threshold referenced to 0.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 30V - supports wide-input industrial and battery-derived rails without pre-regulation. |
| Switching Frequency | 550kHz typical (330–750kHz programmable via PLLLPF) - balances efficiency, size, and EMI compliance in compact layouts. |
| Output Phase Relationship | 180° out-of-phase operation - reduces input capacitor RMS current by ~70%, enabling smaller bulk capacitance. |
| Reference Voltage | 0.6V ±1% - enables precise output regulation down to 0.6V and scalable higher voltages using resistive dividers. |
| Tracking Accuracy | Programmable up/down slew rate via FBT/CMPIN2 - ensures controlled power sequencing between dual outputs (e.g., core vs I/O rails). |
| Shutdown Current | <100µA - meets ultra-low quiescent power requirements for always-on subsystems. |
| Burst Mode Threshold | Automatically engages below ~0.2A load - maintains >85% efficiency at light loads without external enable logic. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed PGND pad (Pin 33), RoHS-compliant, thermal resistance θJA = 34°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Switching Node (Ch1 / Ch2) | Connects directly to source of bottom MOSFET and drain of top MOSFET; monitored for current limit and burst mode entry. |
| TG1 / TG2 | Top Gate Drive Output | Drives gate of high-side N-MOSFET with bootstrapped voltage swing; rated for ≤6000pF gate capacitance. |
| BG1 / BG2 | Bottom Gate Drive Output | Drives gate of low-side N-MOSFET; rated for ≤10,000pF gate capacitance; returns to PGND. |
| IMAX1 / IMAX2 | Current Limit Programming Input | Internal 10µA current source pulls up; sets ILIM threshold via single resistor to SGND - eliminates sense resistor. |
| CMPIN1 / CMPIN2 | Real-Time Output Voltage Monitor | Direct connection to VOUT divider; feeds PGOOD, overvoltage, and burst comparators - enables fast fault response. |
| FBT | Feedback Tracking Input | Servos to CMPIN2 during startup/shutdown to enforce synchronized ramp rates between channels. |
| RUN/SS | Soft-Start & Enable Control | 7µA internal pull-up; external capacitor sets ramp time (~300ms/µF); <0.8V forces shutdown. |
| PHASEMD | Phase Configuration Select | Floating = 0° phase offset; pulled high = +90°; pulled low = power-down tracking - no external logic required. |
Key Features
| Feature | Design Value |
|---|---|
| Leading-edge modulation | Enables stable sub-5% duty cycle operation without minimum pulse width constraints - critical for high VIN/VOUT ratios (e.g., 24V→1.2V). |
| Line feedforward compensation (VINFF) | Directly modulates PWM comparator input to cancel line transients within one switching cycle - improves line regulation to ±0.1%. |
| Programmable current limit without sense resistor | Reduces BOM count and PCB area; eliminates I²R losses and thermal drift associated with discrete sense resistors. |
| 180° out-of-phase dual-channel operation | Cuts input ripple frequency in half and reduces RMS input capacitor current - allows use of smaller, lower-ESR ceramic capacitors. |
| Burst Mode® at light load | Maintains >85% efficiency at 0.2A output while reducing switching losses - extends battery runtime in portable devices. |
Applications
| Notebook CPU Core & I/O Power Rails | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Dual-output power supply delivering 1.2V/15A (core) and 3.3V/10A (I/O) from 12V–20V battery or adapter input. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent voltage rails with precise sequencing and dynamic load response. Use Value: 180° phase shift reduces input capacitor stress; programmable tracking ensures safe core-voltage ramp before I/O activation. |
Use Scenario: Battery-powered handheld ultrasound device requiring tightly regulated 1.8V analog front-end and 5V digital logic rails. IC Role / Device Role / Timing Role: Dual-channel controller providing isolated, low-noise power domains with Burst Mode for standby efficiency. Use Value: ±1% reference and real-time CMPIN monitoring guarantee signal integrity; <100µA shutdown current extends battery life between scans. |
| Industrial DC Power Distribution | Test & Measurement Equipment |
|
Use Scenario: Rack-mounted data acquisition system drawing from 24V DC bus, needing 3.3V, 5V, and 12V rails with coordinated startup. IC Role / Device Role / Timing Role: High-VIN dual controller generating multiple regulated outputs with programmable FBT-based sequencing. Use Value: 30V absolute max input rating tolerates industrial bus transients; phase-lock capability synchronizes to system clock for EMI reduction. |
Use Scenario: Benchtop oscilloscope requiring ultra-stable ±5V analog supplies and clean 1.2V FPGA core voltage from 15V input. IC Role / Device Role / Timing Role: Precision dual controller delivering low-noise, low-drift outputs with overvoltage protection on each rail. Use Value: Real-time CMPIN sensing and ±10% PGOOD window prevent damage to sensitive ADCs and DACs during fault conditions. |
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 |
|---|---|---|---|
| LTC3855IUFD#PBF | Single-channel, 600kHz, integrated MOSFET drivers (no external gate drivers needed); supports 4.5V–38V input. | Lacks dual-phase interleaving and tracking; better suited for space-constrained single-rail designs. | Select when board area is critical and only one output is required; not suitable for interleaved input filtering or rail sequencing. |
| MP2918GL-Z | Dual-phase, 600kHz, integrated MOSFET drivers; includes PMBus interface and telemetry; requires external current sense resistors. | Offers digital configuration and fault logging but adds firmware dependency and BOM complexity. | Select when system-level telemetry, remote configuration, or adaptive loop tuning is required - not drop-in compatible. |
Compared with LTC3802EUH#PBF, LTC3855IUFD#PBF simplifies layout but sacrifices dual-rail coordination, while MP2918GL-Z adds digital intelligence at the cost of analog simplicity and sense-resistor overhead - LTC3802EUH#PBF remains optimal for analog-controlled, high-reliability dual-rail sequencing.
Availability
LTC3802EUH#PBF is available at Aetrix Electronics and suitable for notebook power management, portable medical instrumentation, and industrial DC distribution systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC3802EUH#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC3802EUH#PBF.
The LTC3802EUH#PBF belongs to Linear's high-performance power controller family, designed specifically for efficient, sequenced multi-rail DC/DC conversion in portable and industrial applications where reliability and analog precision are critical.
FAQ
What is the maximum input voltage supported by the LTC3802EUH#PBF?
The LTC3802EUH#PBF supports an absolute maximum input voltage of 30V on the VINFF pin and operates continuously from 3V to 30V. This wide range enables direct use with 24V industrial buses and multi-cell Li-ion battery packs without intermediate regulation. Exceeding 30V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3802EUH#PBF require external current sense resistors?
No, the LTC3802EUH#PBF does not require external current sense resistors. It implements programmable current limiting via internal 10µA current sources on IMAX1 and IMAX2 pins - connecting a single resistor from each IMAX pin to SGND sets the overcurrent threshold, eliminating sense resistor losses and layout sensitivity.
How does the LTC3802EUH#PBF achieve power rail sequencing?
The LTC3802EUH#PBF achieves precise power rail sequencing through its FBT pin, which is servoed to CMPIN2 during startup and shutdown. By configuring resistive dividers on FBT and CMPIN2, designers enforce matched or ratiometric slew rates between VOUT1 and VOUT2 - ensuring safe core-I/O or analog-digital power-up order without external timers.
What package type is used for the LTC3802EUH#PBF?
The LTC3802EUH#PBF uses a 32-lead plastic QFN package measuring 5mm × 5mm with an exposed PGND pad (Pin 33). This thermally enhanced package delivers θJA = 34°C/W and requires soldering the exposed pad to the PCB ground plane for proper thermal and electrical performance.
Can the LTC3802EUH#PBF operate in Burst Mode® with both channels active?
Yes, the LTC3802EUH#PBF automatically enters Burst Mode® on each channel independently when its respective load falls below ~0.2A. Both channels may operate in Burst Mode simultaneously under light-load conditions, maintaining high efficiency without requiring external control signals or mode selection pins.
LTC3802EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- 32-QFN (5x5)
LTC3802EUH#PBF FAQ
1.How can I place an order for LTC3802EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3802EUH#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 LTC3802EUH#PBF reliable?
The price and inventory of LTC3802EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3802EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3802EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3802EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3802EUH#PBF?
LTC3802EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3802EUH#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 LTC3802EUH#PBF?
For technical support, including LTC3802EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3802EUH#PBF requirements.
6.How does Aetrix verify that LTC3802EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3802EUH#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 LTC3802EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3802EUH#PBF?
All LTC3802EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3802EUH#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 LTC3802EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3802EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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