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Analog Devices Inc. LTC3802EUH#TRPBF
- Part No.:
- LTC3802EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3802EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,603
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Product details
Overview
LTC3802EUH#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, 180° out-of-phase operation at 550kHz (adjustable 330–750kHz), programmable up/down tracking, and ±1% 0.6V reference-enabling precise dual-rail power delivery in notebook computers and portable instrumentation.
For engineers reviewing the LTC3802EUH#TRPBF datasheet, LTC3802EUH#TRPBF pinout, LTC3802EUH#TRPBF application, or LTC3802EUH#TRPBF equivalent, key selection considerations include its dual-channel phase synchronization capability, external N-MOSFET architecture, line feedforward compensation for fast line transient response, and integrated overvoltage protection with PGOOD flag.
Technical Context
The LTC3802EUH#TRPBF implements a constant-frequency voltage-mode control architecture with leading-edge PWM modulation-enabling stable operation down to sub-5% duty cycles. Its two independent buck controllers share a master clock and are configured 180° out of phase to halve input capacitor RMS current and reduce EMI.
Phase-locking is achieved via PLLIN and PLLLPF pins, supporting synchronization from 330kHz to 750kHz; frequency tuning is analog via PLLLPF voltage (0–2.4V). The FBT pin enables real-time power-up/down sequencing between channels, while RUN/SS provides soft-start and externally programmable current limit without sense resistors.
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) - balances efficiency, size, and EMI; fixed-frequency avoids subharmonic instability. |
| Output Tracking | Programmable up/down slew rate via FBT/CMPIN2 - ensures controlled power sequencing for multi-rail FPGAs and processors. |
| Voltage Reference | ±1% 0.6V internal reference - enables accurate output regulation (e.g., 3.3V ±33mV, 2.5V ±25mV) across temperature. |
| Current Limit | Programmable without external sense resistor - IMAX1/IMAX2 pins source 10µA; threshold set by single resistor to SGND. |
| Protection Features | Overvoltage detection (±10% VFB), PGOOD flag, and shutdown current <100µA - ensures system-level safety and low-power standby. |
| Package | 32-lead 5mm × 5mm QFN with exposed PGND pad - thermally enhanced for high-current dual-phase designs. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = PGND, must be soldered to PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Channel 1/2 switching node | Connects to drain of top MOSFET and source of bottom MOSFET; used for current sensing and Burst Mode detection. |
| TG1 / TG2 | Top gate drive output | Drives gate of external high-side N-MOSFET; swing equals PVCC superimposed on SWx node voltage. |
| BG1 / BG2 | Bottom gate drive output | Drives gate of external low-side N-MOSFET; designed for ≤10,000pF load; returns to PGND. |
| FB1 / FB2 | Error amplifier inverting input | Connected to resistive divider from VOUTx; sets regulated output voltage (VOUT = 0.6V × (1 + R1/R2)). |
| CMPIN1 / CMPIN2 | Real-time output voltage monitor | Directly feeds PGOOD, overvoltage, and Burst Mode comparators; requires low-noise layout. |
| IMAX1 / IMAX2 | Current limit threshold set | 10µA internal current source pulls up; threshold = 0.6V + (IIMAX × RSET); no sense resistor needed. |
| RUN/SS | Soft-start and enable control | 7µA internal pull-up; external capacitor sets ramp rate; <0.8V forces shutdown; controls tracking timing. |
| PLLLPF | PLL low-pass filter / frequency set | Analog voltage input (0–2.4V) adjusts oscillator frequency from 330kHz to 750kHz; replaces external RC. |
Key Features
| Feature | Design Value |
|---|---|
| Leading-edge modulation | Enables stable operation below 5% duty cycle-critical for high VIN-to-low VOUT conversion (e.g., 24V → 1.2V). |
| 180° out-of-phase dual controllers | Reduces input capacitor RMS current by ~70%, allowing smaller, lower-ESR bulk capacitors and lower EMI. |
| Line feedforward compensation (VINFF) | Directly modulates PWM comparator input to reject line transients within one switching cycle-no loop delay. |
| Burst Mode® operation | Automatically engages at light load to maintain >85% efficiency down to 10mA output-extends battery life. |
| Programmable tracking (FBT pin) | Supports ratiometric, identical, or disabled sequencing between channels-meets FPGA, ASIC, and DDR memory power-up requirements. |
Applications
| Notebook Power Delivery | Portable Instrumentation |
|---|---|
Use Scenario: Dual-rail CPU core (1.2V) and I/O (3.3V) supply in ultra-thin notebooks with 12–20V battery input. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller providing tightly tracked, low-noise, high-efficiency regulation with fast load-step response. Use Value: 180° phase interleaving cuts input ripple current in half, enabling compact 10µF ceramic input caps instead of 100µF tantalum. |
Use Scenario: Precision analog front-end and digital logic rails in handheld multimeters or spectrum analyzers powered by 9V alkaline or Li-ion. IC Role / Device Role / Timing Role: Dual-output controller delivering sequenced 5V analog and 3.3V digital supplies with ±1% accuracy and <100µA shutdown current. Use Value: Integrated 0.6V reference and Burst Mode extend battery runtime by >30% versus continuous-mode alternatives at light loads. |
| DC Power Distribution Systems | Battery-Operated Digital Devices |
Use Scenario: Centralized 24V-to-12V/5V conversion in industrial IoT gateways with strict thermal limits and EMI requirements. IC Role / Device Role / Timing Role: High-VIN dual-phase controller with line feedforward and PLL synchronization to system clock for deterministic noise placement. Use Value: VINFF pin enables <50µs line transient recovery-prevents brownout during motor startup or relay switching on shared 24V bus. |
Use Scenario: Power management for portable medical devices (e.g., glucose meters) requiring dual outputs and long shelf life. IC Role / Device Role / Timing Role: Low-quiescent-current dual controller with programmable soft-start and PGOOD monitoring for safe power-up. Use Value: <100µA shutdown current and integrated OVP ensure compliance with IEC 62368-1 leakage limits and prevent battery drain during storage. |
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 |
|---|---|---|---|
| ISL6269CRZ-T | Fixed 500kHz frequency; no PLL sync; requires external current sense resistor; 24-lead QFN. | Lacks programmable tracking and line feedforward; less suitable for wide-VIN or strict sequencing applications. | Choose when cost sensitivity outweighs need for VINFF, FBT, or wide frequency range. |
| TPS546B24RVFT | Dual-output PMBus-enabled controller; 400kHz–2MHz range; integrated MOSFET drivers; 32-pin VQFN. | Includes digital telemetry and margining; higher BOM cost; requires PMBus interface and firmware support. | Choose when remote monitoring, dynamic voltage scaling, or fault logging are required. |
Compared with ISL6269CRZ-T and TPS546B24RVFT, the LTC3802EUH#TRPBF delivers superior line transient immunity via VINFF, simpler current limit programming, and analog frequency tuning-making it optimal for analog-intensive, wide-input, and sequencing-critical designs where digital overhead is undesirable.
Availability
LTC3802EUH#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and battery-operated digital devices requiring stable component supply, long-lifecycle availability, and guaranteed parametric performance over –40°C to 85°C.
Supply support for LTC3802EUH#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 power management portfolio with rigorous qualification and long-term product support.
The LTC3802EUH#TRPBF belongs to Linear's precision analog power controller family, designed specifically for high-efficiency, wide-input, dual-rail DC/DC conversion in space-constrained, thermally demanding applications.
FAQ
What is the operating temperature range for the LTC3802EUH#TRPBF?
The LTC3802EUH#TRPBF is specified for operation from –40°C to +85°C (extended commercial grade) with storage range from –65°C to +125°C. Its electrical characteristics-including ±1% reference accuracy and current limit threshold-are guaranteed across this full range per the datasheet's "G" conditions.
Does the LTC3802EUH#TRPBF require an external current sense resistor?
No, the LTC3802EUH#TRPBF does not require an external current sense resistor. Its IMAX1 and IMAX2 pins each source a precise 10µA internal current, allowing current limit threshold to be set with a single resistor to SGND-reducing BOM count and board area versus shunt-based solutions.
How is phase synchronization implemented on the LTC3802EUH#TRPBF?
The LTC3802EUH#TRPBF uses PLLIN and PLLLPF pins for phase synchronization. The falling edge of PLLIN serves as the reference; PHASEMD selects 0° or 90° offset for TG1 relative to PLLIN, while TG2 remains 180° out of phase with TG1-enabling precise multi-phase coordination without external clock dividers.
Can the LTC3802EUH#TRPBF operate with input voltages below 3V?
No, the LTC3802EUH#TRPBF has a minimum input voltage rating of 3V per its absolute maximum ratings and functional specifications. Operation below 3V violates the VCC and PVCC supply requirements and may result in undefined behavior, loss of regulation, or failure to start.
What is the purpose of the VINFF pin on the LTC3802EUH#TRPBF?
The VINFF pin on the LTC3802EUH#TRPBF provides line feedforward compensation: it directly modulates the PWM comparator input in inverse proportion to input voltage changes, enabling near-instantaneous correction of line transients-typically within one switching cycle-without relying on feedback loop bandwidth.
LTC3802EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- 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:
- 32-QFN (5x5)
LTC3802EUH#TRPBF FAQ
1.How can I place an order for LTC3802EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3802EUH#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 LTC3802EUH#TRPBF reliable?
The price and inventory of LTC3802EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3802EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3802EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3802EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3802EUH#TRPBF?
LTC3802EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3802EUH#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 LTC3802EUH#TRPBF?
For technical support, including LTC3802EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3802EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3802EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3802EUH#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 LTC3802EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3802EUH#TRPBF?
All LTC3802EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3802EUH#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 LTC3802EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3802EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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