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Analog Devices Inc. LTC7820EUFD#TRPBF
- Part No.:
- LTC7820EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7820EUFD#TRPBF.pdf
- Description:
- IC CHARGE PUMP DC/DC CTRLR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,991
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Product details
Overview
LTC7820EUFD#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-ratio, high-voltage, inductorless switched-capacitor DC/DC controller for voltage divider (2:1 step-down), doubler (1:2 step-up), and inverter (1:1) topologies. It drives four external N-channel MOSFETs, supports up to 72V input in divider mode, delivers >99% peak efficiency, and operates in a thermally enhanced 28-lead 4mm × 5mm QFN package - used in high-power intermediate bus converters for telecom and industrial systems.
For engineers reviewing the LTC7820EUFD#TRPBF datasheet, LTC7820EUFD#TRPBF pinout, LTC7820EUFD#TRPBF application, or LTC7820EUFD#TRPBF equivalent, key selection considerations include its 100kHz–1MHz programmable switching frequency, 50% duty-cycle gate drive timing, high-side current sensing architecture, VHIGH_SENSE/VLOW_SENSE Kelvin sensing, and fault protection with programmable timer and retry.
Technical Context
The LTC7820EUFD#TRPBF implements open-loop, constant-frequency charge-pump control with precise 50% duty-cycle switching across all four gate drivers (G1–G4), enabling soft-switching operation without inductors. Its architecture relies on flying capacitor pre-balancing and synchronized phase interleaving to minimize inrush current and EMI.
It integrates dual LDOs (INTVCC and EXTVCC switchover), a window comparator for VLOW_SENSE monitoring (programmable via HYS_PRGM), and high-side current sensing with 50mV overcurrent threshold referenced to ISENSE+ and ISENSE–. Fault response includes FAULT pin assertion, PGOOD deactivation, and automatic shutdown with thermal protection up to 165°C junction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Voltage divider (2:1), doubler (1:2), inverter (1:1) - no feedback loop; output ratio fixed by topology and capacitor network. |
| Max Input Voltage (Divider) | 72V - enables direct conversion from 48V/60V intermediate bus rails without pre-regulation. |
| Max Input Voltage (Doubler/Inverter) | 36V - defines safe operating range when configured as step-up or polarity-inverting converter. |
| Switching Frequency Range | 100kHz to 1MHz - set linearly via resistor on FREQ pin; trade-off between efficiency (lower fS) and component size (higher fS). |
| Peak Efficiency | Over 99% - achieved via zero-voltage switching (ZVS) behavior and low RDS(on) driver on-resistance (1.1–2.5Ω). |
| Current Sense Threshold | 45–55mV - precise overcurrent detection at ISENSE+–ISENSE–; triggers FAULT and disables switching. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and telecom environments; thermal shutdown activates at ~165°C. |
Pinout & Package
The LTC7820EUFD#TRPBF is housed in a thermally enhanced 28-lead plastic QFN package (4mm × 5mm), with exposed pad (Pin 29) soldered to PCB ground for optimal thermal performance and noise immunity. Pin spacing accommodates high-voltage isolation requirements, including NC pins (2, 10, 13, 26) placed between adjacent high-voltage nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VHIGH_SENSE (1) | Kelvin sense input | Monitors drain voltage of top MOSFET (M1); enables accurate high-side voltage reference for VLOW pre-balance and fault detection. |
| G1 (24), G2 (21), G3 (17), G4 (15) | N-channel gate drivers | Drive external power MOSFETs with 50% duty cycle; G1/G2/G3 use floating bootstrapped supplies (BOOST1–BOOST3); G4 is ground-referenced. |
| ISENSE+ (27), ISENSE– (28) | High-side current sense inputs | Detect overcurrent via voltage drop across external sense resistor; ISENSE+ sources 93mA during pre-balance in divider mode. |
| VLOW_SENSE (19), VLOW (20) | Half-supply sense & node | VLOW_SENSE monitors VLOW (≈VHIGH_SENSE/2); window comparator detects OV/UV faults relative to programmed thresholds. |
| FREQ (5), HYS_PRGM (3), TIMER (4) | Programmable analog inputs | FREQ sets switching frequency via 10µA sink; HYS_PRGM configures VLOW_SENSE fault window; TIMER sets pre-balance and short-circuit retry time. |
| FAULT (9), PGOOD (7), RUN (6) | Open-drain status/control | FAULT asserts low on overcurrent, OV/UV, or INTVCC UVLO; PGOOD indicates healthy operation; RUN enables/disables controller with hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless architecture | Eliminates magnetic components - reduces board area, weight, and EMI; enables ultra-thin, high-power-density bus converters. |
| Soft-start pre-balancing | Internally sources 93mA to VLOW during startup to equalize flying capacitor voltages - prevents destructive inrush currents. |
| Programmable fault protection | HYS_PRGM pin sets VLOW_SENSE window thresholds; TIMER pin configures retry delay after short-circuit - enhances system robustness. |
| Dual LDO power architecture | INTVCC (5.6V) powered from VCC or EXTVCC (6.5–40V); improves efficiency at high input voltages and reduces IC self-heating. |
| High-voltage compatible layout | No-connect pins (2, 10, 13, 26) provide creepage/clearance between high-potential nodes - simplifies PCB design for 72V-rated applications. |
Applications
| Telecom Intermediate Bus Converter | Industrial 48V-to-24V Power Distribution |
|---|---|
|
Use Scenario: Converting 48V backplane supply to 24V intermediate rail in 5G base station RF modules. IC Role / Device Role / Timing Role: Fixed-ratio charge-pump controller managing four external MOSFETs in 2:1 voltage divider configuration; no closed-loop regulation required. Use Value: Achieves >99% efficiency at 10A load with minimal ripple and no inductor - critical for thermal-constrained RF front-end enclosures. |
Use Scenario: High-current 48V-to-24V conversion in programmable logic controller (PLC) power subsystems. IC Role / Device Role / Timing Role: Open-loop switched-capacitor controller driving discrete N-MOSFETs; uses VHIGH_SENSE/VLOW_SENSE Kelvin sensing for stable half-rail generation. Use Value: Enables compact, low-EMI 500W+ conversion without magnetics - improves system reliability in noisy industrial environments. |
| Data Center Server Voltage Doubler | Automotive Test Equipment Inverter |
|
Use Scenario: Generating 48V from 24V battery input in AI accelerator card power delivery networks. IC Role / Device Role / Timing Role: Configured as 1:2 voltage doubler; G1–G4 sequenced to charge flying capacitors in parallel then series. Use Value: Delivers 20A at 48V with <1.2W conduction loss - avoids bulky isolated DC/DC modules while maintaining safety isolation via capacitor coupling. |
Use Scenario: Providing ±24V dual-rail supply for precision analog test instrumentation in EV battery validation labs. IC Role / Device Role / Timing Role: Operated as 1:1 inverter; VLOW referenced to GND, output taken between M1 drain and VLOW node. Use Value: Generates clean, low-noise negative rail without transformers or charge-pump ICs - supports sub-mV ripple requirements for 16-bit DAC/ADC references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-ratio switched-capacitor controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7821IUFD#TRPBF | Same pinout and function; rated for –40°C to 125°C industrial temp grade (LTC7820E is extended temp, not automotive). | Identical topology support and protection features; differs only in guaranteed temperature range and screening. | Select LTC7821 for designs requiring full industrial-grade qualification across full –40°C to 125°C junction range. |
| MPQ4332GJ-AEC1-Z | Monolithic 2:1 buck-charge-pump IC (integrated MOSFETs); max 36V input; no external MOSFET flexibility or 72V capability. | Targeted at space-constrained automotive infotainment; lacks programmable fault timing, Kelvin sensing, or high-voltage divider support. | Choose MPQ4332 only for cost-sensitive, lower-power (<100W), automotive AEC-Q100 applications where integration outweighs flexibility. |
Compared with LTC7821IUFD#TRPBF and MPQ4332GJ-AEC1-Z, the LTC7820EUFD#TRPBF uniquely supports 72V input in divider mode, offers full external MOSFET control for thermal/power optimization, and provides precision programmable fault windows - making it the only option for high-reliability, high-power (>300W), non-isolated intermediate bus conversion.
Availability
LTC7820EUFD#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and data center power distribution requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC7820EUFD#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, communications, and automotive markets.
The LTC7820EUFD#TRPBF belongs to Linear's high-efficiency power controller product line, designed specifically for high-power, non-isolated, inductorless DC/DC conversion in intermediate bus architectures where efficiency, density, and reliability are critical.
FAQ
What is the maximum input voltage supported by the LTC7820EUFD#TRPBF in voltage divider mode?
The LTC7820EUFD#TRPBF supports up to 72V input voltage in voltage divider (2:1 step-down) configuration, as confirmed by Absolute Maximum Ratings and Electrical Characteristics tables. This enables direct conversion from standard 48V and 60V intermediate bus rails without pre-regulation stages. Operation above 72V risks permanent damage per datasheet limits.
Does the LTC7820EUFD#TRPBF require an output voltage feedback loop?
No, the LTC7820EUFD#TRPBF operates in open-loop mode with fixed voltage ratios determined by topology (2:1, 1:2, or 1:1). It does not regulate output voltage via feedback; instead, it monitors VLOW_SENSE against VHIGH_SENSE/2 and shuts down on deviation. Output accuracy depends on capacitor matching and MOSFET RDS(on) balance - not closed-loop control.
How is switching frequency programmed on the LTC7820EUFD#TRPBF?
Switching frequency on the LTC7820EUFD#TRPBF is set using a resistor from the FREQ pin (Pin 5) to GND. A precision 10µA current flows out of FREQ, generating a voltage (VFREQ = R × 10µA) that linearly controls frequency from 100kHz to 1MHz. For example, a 100kΩ resistor yields ~1V on FREQ and ~483kHz operation per the fS = RFREQ(kΩ) × 8 − 317kHz equation.
Can the LTC7820EUFD#TRPBF be used in inverting configurations?
Yes, the LTC7820EUFD#TRPBF supports 1:1 inverting operation with up to 36V input. In this mode, input is applied between VHIGH_SENSE and VLOW, and the inverted output appears at GND referenced to VLOW. The device maintains soft-switching behavior and full fault protection - including VLOW_SENSE window monitoring and overcurrent detection - as verified in Figure 9 and Applications Information.
What is the purpose of the EXTVCC pin on the LTC7820EUFD#TRPBF?
The EXTVCC pin (Pin 11) supplies an alternative input to the INTVCC LDO, improving efficiency when VCC exceeds 7V. When EXTVCC is >6.5V and VCC >7V, the IC switches from VCC-powered INTVCC to EXTVCC-powered INTVCC, reducing power dissipation and die temperature. EXTVCC must not exceed 40V and is intended for use with locally regulated auxiliary supplies.
LTC7820EUFD#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)
LTC7820EUFD#TRPBF FAQ
1.How can I place an order for LTC7820EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7820EUFD#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 LTC7820EUFD#TRPBF reliable?
The price and inventory of LTC7820EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7820EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7820EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7820EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7820EUFD#TRPBF?
LTC7820EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7820EUFD#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 LTC7820EUFD#TRPBF?
For technical support, including LTC7820EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7820EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC7820EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7820EUFD#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 LTC7820EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7820EUFD#TRPBF?
All LTC7820EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7820EUFD#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 LTC7820EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7820EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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