My Inquiry
My Account
Analog Devices Inc. LT8620IUDD#TRPBF
- Part No.:
- LT8620IUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LT8620IUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,034
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8620IUDD#TRPBF from Analog Devices (formerly Linear Technology) is a 65V input, 2A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode operation, 30ns minimum on-time, and internal compensation. It delivers regulated 5V/2A output in compact 3mm × 5mm QFN-24 package and is used in automotive infotainment power supplies where ultra-low standby power and high VIN tolerance are critical.
For engineers reviewing the LT8620IUDD#TRPBF datasheet, LT8620IUDD#TRPBF pinout, LT8620IUDD#TRPBF application, or LT8620IUDD#TRPBF equivalent, key selection criteria include its 65V absolute max input rating, ±9% power-good accuracy, 200kHz–2.2MHz programmable switching frequency via RT resistor, and BIAS pin support for efficiency optimization at 3.3V+ outputs.
Technical Context
The LT8620IUDD#TRPBF implements peak-current-mode control with internal 0.970V reference and fixed-frequency PWM architecture. Its 30ns minimum on-time enables high step-down ratios (e.g., 48V→3.3V at 700kHz), while fast transient response is ensured by internal compensation and low ESR output capacitor compatibility.
Burst Mode operation maintains <10mVP-P output ripple down to µA-level loads by delivering discrete energy packets and entering deep sleep (1.7µA IQ). Synchronization via SYNC pin disables Burst Mode and enables pulse-skipping or external clock alignment - critical for EMI-sensitive automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 65V - supports wide automotive battery transients (cold crank, load dump) without external protection. |
| Output Current | 2A continuous - sufficient for powering DSPs, microcontrollers, and interface ICs in embedded systems. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on telematics modules. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows trade-off between inductor size (e.g., 4.7µH @ 700kHz) and efficiency. |
| Feedback Reference | 0.970V ±0.006V - enables precise output regulation (±1% typical over temp) using standard 1% resistors. |
| Power-Good Accuracy | ±9% of VOUT - provides reliable system reset signaling without external monitoring circuitry. |
| Min On-Time | 30ns - supports high VIN/VOUT ratios (e.g., 48V→5V) at 2MHz without pulse skipping. |
Pinout & Package
LT8620IUDD#TRPBF uses a thermally enhanced 24-pin 3mm × 5mm QFN package with exposed pad (Pin 25 = GND). The package features dual SW pins (Pins 14 & 15), dual VIN pins (Pins 5 & 6), and dedicated BIAS, INTVCC, and PG pins for robust power sequencing and fault reporting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (14,15) | Switch Node | Connects to inductor and BST capacitor; must be minimized on PCB to reduce EMI and switching losses. |
| VIN (5,6) | Main Input Supply | Supplies internal circuitry and top switch; requires local 1µF ceramic bypass placed adjacent to pins. |
| BIAS (11) | Efficiency Optimization Bias | When tied to VOUT ≥3.3V, reduces VIN current draw and improves light-load efficiency. |
| PG (10) | Power-Good Flag | Open-drain output asserting low when VFB deviates >±9% or during fault; valid above 3.4V VIN. |
| EN/UV (4) | Enable / UVLO Input | Hysteretic 1.00V rising / 0.96V falling threshold; enables programmable input undervoltage lockout. |
| RT (3) | Frequency Set Resistor | Resistor to GND sets fSW from 200kHz to 2.2MHz; e.g., 60.4kΩ yields 700kHz. |
| TR/SS (2) | Soft-Start / Tracking | Capacitor here programs output ramp rate; also enables voltage tracking for multi-rail sequencing. |
| GND (1,17,18,19,20,25) | Ground / Thermal Pad | Exposed pad (Pin 25) must be soldered to PCB plane for θJC = 5°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode enables >10-year battery backup in always-on automotive modules. |
| Low-Ripple Burst Mode | Maintains <10mVP-P output ripple at µA loads via controlled energy pulses - eliminates need for post-regulation LDOs. |
| Wide Input Range | 65V absolute max rating tolerates ISO 7637-2 Pulse 5a (76V) without external TVS - reduces BOM count. |
| Programmable Switching | 200kHz–2.2MHz range via single RT resistor allows optimization for size (high fSW) or efficiency (low fSW). |
| Internal Compensation | Eliminates external compensation network - reduces layout sensitivity and accelerates design validation. |
| BIAS Pin Efficiency Boost | Draws bias current from VOUT instead of VIN when VBIAS ≥3.1V - improves full-load efficiency by ~1.5% at 12V→5V. |
Applications
| Automotive Infotainment Power | Industrial IoT Sensor Hub |
|---|---|
|
Use Scenario: Powers display controller, audio codec, and CAN transceiver in head unit with 9V–16V battery input and cold-crank survival requirement. IC Role / Device Role / Timing Role: Primary 5V/2A buck converter with BIAS pin connected to 5V rail and PG flag feeding MCU reset line. Use Value: 2.5µA quiescent current extends battery drain time during vehicle sleep mode; 65V rating avoids external clamping diodes. |
Use Scenario: Supplies 3.3V to ARM Cortex-M4 MCU, BLE radio, and MEMS accelerometer in battery-powered edge node. IC Role / Device Role / Timing Role: Main system regulator operating in Burst Mode with TR/SS pin controlling startup sequencing with analog front-end. Use Value: 30ns min on-time enables direct 12V→3.3V conversion at 2MHz, reducing inductor size by 40% vs. legacy controllers. |
| GSM Base Station Backhaul | Railway Signaling Controller |
|
Use Scenario: Generates stable 5V for FPGA configuration and RF front-end in outdoor macrocell base station with 48V DC plant supply. IC Role / Device Role / Timing Role: Secondary regulator fed from intermediate 12V bus; SYNC pin synchronized to system clock to suppress conducted EMI. Use Value: Programmable 200kHz–2.2MHz fSW allows EMI filtering at fixed frequency bands; ±9% PG accuracy ensures FPGA configuration integrity. |
Use Scenario: Provides 24V→5V/2A power to safety-critical PLC logic in EN 5012x-compliant railway signaling cabinet. IC Role / Device Role / Timing Role: Isolated secondary-side regulator with EN/UV pin configured for 20V undervoltage lockout to prevent brownout resets. Use Value: Dual VIN pins and exposed thermal pad ensure reliable 2A operation at 70°C ambient; AEC-Q100 Grade I qualification (via LT8620I grade) meets rail standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1A output, 1.5µA IQ, no BIAS pin, requires external compensation. | Lacks BIAS pin efficiency boost and internal compensation; lower current rating limits use in 2A systems. | Select when 1A output suffices and cost minimization outweighs layout simplicity and thermal performance. |
| MAX20008AATP/VY+ | 3.5V–60V input, 2A output, 2.2µA IQ, integrated MOSFETs, but only 500kHz max fSW. | Lower max switching frequency restricts inductor miniaturization; no SYNC pin for EMI synchronization. | Prefer for space-constrained designs needing lowest possible IQ, accepting larger magnetics and fixed-frequency operation. |
Compared with LM5164QPWPRQ1 and MAX20008AATP/VY+, the LT8620IUDD#TRPBF uniquely combines 2A capability, 2.5µA IQ, 2.2MHz programmability, BIAS pin support, and internal compensation - enabling smaller, cooler, and more flexible power designs in automotive and industrial environments.
Availability
LT8620IUDD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial IoT sensor hubs, and railway signaling controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8620IUDD#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 automotive and industrial qualification standards.
The LT8620 series was designed for high-input-voltage, ultra-low-quiescent-current DC/DC conversion in harsh environments - targeting automotive subsystems, industrial controls, and telecom infrastructure where reliability and efficiency coexist.
FAQ
What is the maximum input voltage rating for the LT8620IUDD#TRPBF?
The LT8620IUDD#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pins. This allows it to withstand automotive load-dump transients per ISO 7637-2 without external protection components. Continuous operation is specified from 3.4V to 65V, making the LT8620IUDD#TRPBF suitable for 24V and 48V industrial and transportation systems.
How does the BIAS pin improve efficiency in the LT8620IUDD#TRPBF?
The BIAS pin on the LT8620IUDD#TRPBF sources internal regulator current from VOUT (when ≥3.1V) instead of VIN, reducing input supply current and improving full-load efficiency by up to 1.5% at 12V→5V. For the LT8620IUDD#TRPBF, connecting BIAS directly to VOUT is recommended for outputs ≥3.3V - a design choice confirmed in the datasheet's Applications Information section.
Can the LT8620IUDD#TRPBF operate in Burst Mode and still meet EMI requirements?
Yes - the LT8620IUDD#TRPBF's low-ripple Burst Mode operation maintains output ripple below 10mVP-P while drawing only 2.5µA at no load. Its controlled burst profile and fast 30ns minimum on-time minimize spectral spreading, enabling compliance with CISPR 25 Class 5 when combined with proper layout (small SW node, ground plane under exposed pad) and input filtering.
What is the purpose of the TR/SS pin on the LT8620IUDD#TRPBF?
The TR/SS (Track/Soft-Start) pin on the LT8620IUDD#TRPBF serves two functions: soft-start control (via capacitor to set output voltage ramp rate) and voltage tracking (by driving TR/SS with an external reference to coordinate startup with other rails). During fault or shutdown, an internal 220Ω FET pulls TR/SS to GND - a behavior explicitly documented in the Pin Functions section of the LT8620 datasheet.
Is the LT8620IUDD#TRPBF pin-compatible with other LT8620 variants?
No - the LT8620IUDD#TRPBF uses a 24-pin 3mm × 5mm QFN package, while LT8620 variants in MSOP-16 (e.g., LT8620IMSE#TRPBF) have different pin count, layout, and thermal pad configuration. The QFN and MSOP packages are not interchangeable; PCB layout and thermal design must be specific to the UDD variant for the LT8620IUDD#TRPBF.
LT8620IUDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 64.75V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3x5)
LT8620IUDD#TRPBF FAQ
1.How can I place an order for LT8620IUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8620IUDD#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 LT8620IUDD#TRPBF reliable?
The price and inventory of LT8620IUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8620IUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8620IUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8620IUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8620IUDD#TRPBF?
LT8620IUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8620IUDD#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 LT8620IUDD#TRPBF?
For technical support, including LT8620IUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8620IUDD#TRPBF requirements.
6.How does Aetrix verify that LT8620IUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8620IUDD#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 LT8620IUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8620IUDD#TRPBF?
All LT8620IUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8620IUDD#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 LT8620IUDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8620IUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8620IUDD#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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…
