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Analog Devices Inc. LTC7820IUFD#TRPBF
- Part No.:
- LTC7820IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7820IUFD#TRPBF.pdf
- Description:
- IC CHARGE PUMP DC/DC CTRLR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,933
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Product details
Overview
LTC7820IUFD#TRPBF from Analog Devices is a fixed-ratio, high-voltage, inductorless switched-capacitor DC/DC controller for voltage divider (2:1 step-down), doubler (1:2 step-up), or inverter (1:1) topologies. It drives four external N-channel MOSFETs with 50% duty cycle at programmable 100kHz–1MHz frequency, supports up to 72V input in divider mode, delivers >99% peak efficiency, and targets intermediate bus conversion in high-power distributed systems.
For engineers reviewing the LTC7820IUFD#TRPBF datasheet, LTC7820IUFD#TRPBF pinout, LTC7820IUFD#TRPBF application, or LTC7820IUFD#TRPBF equivalent, key selection considerations include its no-inductor charge-pump architecture, high-voltage gate drive timing (G1/G2/G3/G4), VHIGH_SENSE/VLOW_SENSE Kelvin sensing, EXTVCC-supported efficiency optimization, and fault-protected startup sequence with pre-balance timer.
Technical Context
The LTC7820IUFD#TRPBF implements open-loop, constant-frequency switched-capacitor control with anti-shoot-through logic and precise gate driver timing: G1/G2 tD = 50ns, G3/G4 tD = 60ns, and G1/G3 tD = 5ns. It uses floating bootstrap supplies (BOOST1–BOOST3) to bias high-side drivers and relies on external flying capacitors (CFLY) and output capacitors (CVLOW) for energy transfer.
Operation requires Kelvin-sensed VHIGH_SENSE (0–72V range) and VLOW_SENSE (0–36V range), with window-comparator-based fault detection set via HYS_PRGM. Input current sensing occurs at ISENSE+/ISENSE– with 50mV overcurrent threshold, and soft-start is controlled by TIMER pin capacitor programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Voltage divider (2:1), doubler (1:2), or inverter (1:1); no inductors required. |
| Input Voltage Range | Up to 72V for divider mode; up to 36V for doubler/inverter mode - defines max system bus voltage compatibility. |
| Switching Frequency | 100kHz to 1MHz, linearly programmed via FREQ pin current (10µA sink) - balances efficiency vs. capacitor size. |
| Peak Efficiency | Over 99% at 5A load (48V→24V), enabled by soft-switching and low RDS(on) gate drive (RG1,3 = 2.4Ω pull-up). |
| Fault Protections | Programmable overcurrent (50mV sense threshold), VLOW_SENSE window fault, UVLO (INTVCC = 4.85–5.05V), and thermal shutdown. |
| Package & Thermal | 28-pin 4mm × 5mm QFN with exposed GND pad (θJA = 43°C/W); rated for –40°C to 125°C junction temperature. |
| Power Supply Options | INTVCC regulated from VCC (6–72V) or EXTVCC (12–40V); EXTVCC switchover at 6.5V improves efficiency at high input voltages. |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN (UFD), thermally enhanced with exposed GND pad (Pin 29) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VHIGH_SENSE (1) | Kelvin input for top MOSFET drain voltage | Enables accurate high-side voltage monitoring up to 72V; critical for VLOW pre-balance and fault windowing. |
| G1 (24), G2 (21), G3 (17), G4 (15) | N-channel MOSFET gate drivers | G1/G3 drive upper MOSFETs with BOOST1/BOOST3 referenced swing; G2/G4 drive lower/synchronous MOSFETs with ground-referenced or VLOW-referenced swing. |
| ISENSE+ (27), ISENSE– (28) | High-side current sense inputs | Measure differential voltage across external RSENSE; 50mV threshold triggers FAULT for overcurrent protection. |
| VLOW_SENSE (19), VLOW (20) | Half-voltage node sensing and output | VLOW_SENSE monitors VLOW (target = VHIGH_SENSE/2); used for window fault detection and startup validation. |
| FREQ (5), TIMER (4), HYS_PRGM (3) | Configuration and timing control | FREQ sets switching frequency (10µA sink); TIMER programs pre-balance time and short-circuit retry; HYS_PRGM sets VLOW_SENSE window hysteresis. |
| FAULT (9), PGOOD (7), RUN (6) | System status and control | Open-drain FAULT indicates active faults; PGOOD signals valid operation when RUN high and no faults; RUN enables/disables controller (1.14V/1.22V thresholds). |
| EXTVCC (11), INTVCC (12), VCC (14) | Power supply inputs and outputs | VCC powers internal LDO; EXTVCC (12–40V) enables more efficient INTVCC regulation when VCC > 7V; INTVCC supplies all drivers and logic (5.4–5.9V). |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless charge-pump architecture | Eliminates magnetic components - reduces board area, EMI, and cost in high-power intermediate bus converters. |
| Four synchronized gate drivers with timing control | Guaranteed dead-time (G1/G2 = 50ns, G3/G4 = 60ns) prevents shoot-through and enables reliable high-voltage MOSFET switching. |
| VLOW pre-balance circuitry | 93mA source capability from ISENSE+ to VLOW during startup ensures safe capacitor voltage equalization before switching begins. |
| Programmable fault response | Timer-settable short-circuit retry delay and configurable VLOW_SENSE window (via HYS_PRGM resistor) enable application-specific fault recovery. |
| High-voltage compatible pin spacing | No-connect pins (2, 10, 13, 26) isolate adjacent high-voltage nodes (e.g., BOOST1/SW1, BOOST2/VLOW), supporting 72V operation in compact layout. |
Applications
| Telecom Intermediate Bus Converter | Industrial 48V-to-24V Power Distribution |
|---|---|
|
Use Scenario: Converting 48V backplane power to 24V intermediate bus in 1RU telecom servers with strict height constraints. IC Role / Device Role / Timing Role: Fixed-ratio charge-pump controller managing four external MOSFETs in 2:1 voltage divider configuration; operates at 250kHz for optimal efficiency/size trade-off. Use Value: Achieves >99% efficiency at 10A without inductors, reducing thermal footprint and enabling ultra-low-profile power modules compliant with NEBS GR-63-CORE. |
Use Scenario: Powering PLC I/O modules and motor drivers from centralized 48V industrial bus with high reliability requirements. IC Role / Device Role / Timing Role: High-voltage controller implementing robust 2:1 step-down with Kelvin-sensed VHIGH_SENSE/VLOW_SENSE and programmable overcurrent protection. Use Value: Delivers fault-protected operation under transient overload and brownout conditions, with EXTVCC support improving thermal performance at elevated ambient temperatures. |
| High-Density Data Center Voltage Doubler | Isolated Inverter for Bipolar Bias Supplies |
|
Use Scenario: Generating 48V from 24V input in modular server power supplies where space and efficiency are critical. IC Role / Device Role / Timing Role: Configured as 1:2 voltage doubler using same MOSFET layout as divider; leverages identical gate timing and fault logic. Use Value: Enables bidirectional topology reuse - same PCB layout supports both 48V→24V and 24V→48V with only firmware and component value changes. |
Use Scenario: Creating ±24V rails for precision op-amp and ADC biasing in test equipment with minimal component count. IC Role / Device Role / Timing Role: Operating in 1:1 inverting mode with GND tied to negative output; uses VLOW as reference and VHIGH_SENSE as input. Use Value: Provides tightly regulated inverted output (±24V @ 2A) with <100mV ripple and inherent short-circuit limiting - no additional isolation or regulation needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-ratio charge-pump controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4269GJ-A | Monolithic 2:1 charge-pump IC (integrated MOSFETs); max 36V input; no EXTVCC or VLOW_SENSE window programming. | Suitable for lower-power (<100W), space-constrained designs where integration outweighs flexibility. | Select MPQ4269GJ-A when board area is primary constraint and input voltage ≤36V; LTC7820IUFD#TRPBF preferred for >36V or programmable fault behavior. |
| LTC7821IUFD#TRPBF | Pin-compatible upgrade with integrated MOSFET drivers, higher current capability (10A+), and extended VCC range (up to 100V). | Direct drop-in replacement for higher-power or higher-input-voltage versions of same topology. | Choose LTC7821IUFD#TRPBF when scaling beyond 500W or requiring >72V input; retains identical pinout, timing, and feature set. |
Compared with MPQ4269GJ-A, LTC7820IUFD#TRPBF offers higher voltage capability and design flexibility via external MOSFETs and programmable fault response; compared with LTC7821IUFD#TRPBF, it provides cost-optimized performance for 500W-class systems without needing 100V rating or higher current drivers.
Availability
LTC7820IUFD#TRPBF is available at Aetrix Electronics and suitable for telecom intermediate bus converters, industrial 48V-to-24V distribution, and high-density data center voltage doublers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC7820IUFD#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 (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7820IUFD#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency, high-voltage DC/DC controllers designed specifically for inductorless, high-power-density intermediate bus conversion in space- and thermal-constrained systems.
FAQ
What is the maximum input voltage supported by the LTC7820IUFD#TRPBF in voltage divider mode?
The LTC7820IUFD#TRPBF supports up to 72V input voltage in voltage divider (2:1 step-down) mode, as confirmed by absolute maximum ratings and electrical characteristics tables. This rating applies specifically to VHIGH_SENSE and VIN connections in divider configurations; for doubler or inverter modes, the maximum input is limited to 36V per datasheet specifications.
How does the LTC7820IUFD#TRPBF achieve >99% peak efficiency without inductors?
The LTC7820IUFD#TRPBF achieves >99% peak efficiency through soft-switching operation enabled by precise gate timing (e.g., G1/G2 tD = 50ns), low-RDS(on) external MOSFET control, minimized flying capacitor voltage differential, and optimized charge transfer cycles - all verified in typical application measurements at 48V→24V/5A with 100kHz–300kHz switching.
Can the LTC7820IUFD#TRPBF be used in voltage doubler or inverter configurations?
Yes, the LTC7820IUFD#TRPBF supports three configurations: voltage divider (2:1), voltage doubler (1:2), and inverter (1:1). Datasheet Figures 8 and 9 explicitly demonstrate 24V→48V doubling and 24V→–24V inversion, with corresponding VHIGH_SENSE/VLOW_SENSE connections, BOOST pin assignments, and fault behavior validated for each mode.
What is the role of the HYS_PRGM pin on the LTC7820IUFD#TRPBF?
The HYS_PRGM pin on the LTC7820IUFD#TRPBF programs the hysteresis width of the VLOW_SENSE window comparator. A resistor from HYS_PRGM to GND sets two voltage thresholds (e.g., 12.2V/11.6V at VHYS_PRGM = 0V) that define acceptable deviation of VLOW_SENSE from VHIGH_SENSE/2 - critical for startup validation and fault detection in all operating modes.
Does the LTC7820IUFD#TRPBF require external components for startup pre-balancing?
Yes, the LTC7820IUFD#TRPBF integrates pre-balance circuitry but requires an external capacitor on the TIMER pin to set the duration of the VLOW pre-charge phase. During this period, the IC sources 93mA from ISENSE+ to VLOW to equalize flying capacitor voltages - preventing inrush current damage before steady-state switching begins.
LTC7820IUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Number of Outputs:
- 1
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 6V ~ 72V
- Frequency - Switching:
- 100kHz ~ 1MHz
- Duty Cycle (Max):
- 50%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC7820IUFD#TRPBF FAQ
1.How can I place an order for LTC7820IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7820IUFD#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 LTC7820IUFD#TRPBF reliable?
The price and inventory of LTC7820IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7820IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7820IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7820IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7820IUFD#TRPBF?
LTC7820IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7820IUFD#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 LTC7820IUFD#TRPBF?
For technical support, including LTC7820IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7820IUFD#TRPBF requirements.
6.How does Aetrix verify that LTC7820IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7820IUFD#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 LTC7820IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7820IUFD#TRPBF?
All LTC7820IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7820IUFD#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 LTC7820IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7820IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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