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Analog Devices Inc. LT8390AHFE#TRPBF
- Part No.:
- LT8390AHFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8390AHFE#TRPBF.pdf
- Description:
- 60V SYNCHRONOUS 4-SWITCH BUCK-BO
- Quantity:
- Payment:
- Shipping:
Inventory:4,503
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Product details
Overview
LT8390AHFE#TRPBF from Analog Devices is a synchronous 4-switch buck-boost DC/DC controller supporting 4V–60V input and 0V–60V output, operating at up to 2MHz with ±1.5% VOUT accuracy, spread-spectrum EMI reduction, and AEC-Q100 qualification for automotive voltage regulation and battery charging.
For engineers reviewing the LT8390AHFE#TRPBF datasheet, LT8390AHFE#TRPBF pinout, LT8390AHFE#TRPBF application, or LT8390AHFE#TRPBF equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade thermal performance (–40°C to 150°C), and real-world current-mode control behavior across buck/buck-boost/boost transitions.
Technical Context
The LT8390AHFE#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN) and dual independent gate drivers (TG1/BG1, TG2/BG2). It supports seamless region transitions-buck (VIN/VOUT ≤ 0.77), buck-boost (0.77–1.35), and boost (≥1.31)-with hysteresis to prevent mode chattering.
Its oscillator supports fixed-frequency operation (600kHz–2MHz) via RT resistor or external SYNC, plus triangle spread-spectrum modulation (21–25% above base frequency) when SYNC/SPRD is tied to INTVCC. Fault protection includes FB overvoltage (1.08–1.12V), short-circuit detection (FB < 0.24–0.26V), and configurable latch-off/hiccup modes via SS pin resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide automotive battery transients (e.g., cold crank 4V, load dump 60V) |
| Output Voltage Range | 0V to 60V - enables bidirectional regulation for battery charging/discharging and supercapacitor management |
| Switching Frequency | 600kHz to 2MHz - adjustable via RT pin; high-frequency operation allows compact magnetics and low-profile designs |
| VOUT Regulation Accuracy | ±1.5% (1V ≤ VOUT ≤ 60V) - ensures stable power rail tolerance for sensitive analog and digital loads |
| Current Sense Accuracy | ±3% for ISP/ISN monitoring - enables precise input/output current limiting and telemetry in battery systems |
| Junction Temperature Range | –40°C to +150°C - qualified per AEC-Q100 Grade H; supports under-hood automotive deployment without derating |
| Spread Spectrum Modulation | 21–25% triangle FM - reduces peak EMI by spreading switching energy across frequency band, easing EMC compliance |
Pinout & Package
LT8390AHFE#TRPBF is housed in a 28-lead plastic TSSOP package with exposed pad (FE), θJA = 30°C/W, θJC = 5°C/W. The exposed pad (Pin 29) must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 | Buck/Boost switch nodes | Connect to inductor and MOSFET bridges; swing from Schottky drop below GND to VIN (SW1) or VOUT (SW2) |
| TG1, BG1, TG2, BG2 | N-channel MOSFET gate drivers | Drive top/bottom switches with 2.6Ω pull-up / 1.4Ω pull-down (TG) and 3.2Ω/1.2Ω (BG); enable synchronous rectification |
| LSP, LSN | Buck-side inductor current sense inputs | Kelvin-connected to RSENSE; support reverse-current detection and peak-buck current mode control |
| ISP, ISN | Input/output current monitor inputs | Measure system-level current flow; feed into programmable current limit (CTRL pin) and ISMON output |
| FB | Voltage feedback input | Regulates VOUT to 1.00V reference; triggers PGOOD (±10%) and fault protection (OV/UV thresholds) |
| LOADEN / LOADTG | High-side PMOS load switch control | LOADEN enables/disables external PMOS; LOADTG provides buffered inverted drive referenced to VOUT |
| SYNC/SPRD | Frequency control terminal | Ground = internal oscillator; INTVCC = 25% spread spectrum; external clock = synchronization to system master |
| RT | Oscillator timing resistor | Resistor to GND sets frequency: 59.0kΩ → ~2MHz, 100kΩ → ~1.3MHz, 226kΩ → ~685kHz |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; reduces BOM count and board area in wide-input-range systems |
| Seamless buck/buck-boost/boost transitions | No output disturbance during VIN/VOUT crossovers (e.g., 12V battery powering 12V rail during engine start-stop) |
| Programmable current limit via CTRL pin | Linear 5–90mV threshold (0.3–1.15V CTRL) and fixed 100mV full-scale (≥1.35V CTRL) enable flexible CC/CV battery charge profiles |
| VOUT disconnect during shutdown | Isolates output from input when EN/UVLO < 0.3V - prevents backfeed and meets automotive "zero leakage" requirements |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation with lifetime reliability data - suitable for front-end ADAS, infotainment, and body control modules |
Applications
| Automotive Front-End Power Supply | Industrial 24V/48V Battery Charger |
|---|---|
Use Scenario: Regulating 6V–16V automotive battery to stable 12V rail for ADAS camera modules during cold-crank and load-dump events. IC Role / Device Role / Timing Role: 4-switch buck-boost controller managing bidirectional power flow and maintaining regulation across VIN/VOUT crossover. Use Value: Eliminates need for pre-regulator + post-regulator cascade; achieves >95% efficiency at 2MHz while meeting CISPR 25 Class 5 EMI limits via spread spectrum. |
Use Scenario: Charging 24V LiFePO4 battery stack from variable 36V–60V industrial DC bus with constant-current/constant-voltage profile. IC Role / Device Role / Timing Role: Current-mode controller regulating both input current (ISP/ISN) and output voltage (FB) with ±3% accuracy and thermal foldback. Use Value: Single-chip solution replaces discrete buck+boost controllers; supports programmable CC limit (via CTRL) and isolated current monitoring (ISMON). |
| Telecom 48V Intermediate Bus Converter | High-Frequency Supercapacitor Backup System |
Use Scenario: Stepping down 54V telecom rectified input to 48V intermediate bus while accommodating brownouts to 36V and surges to 60V. IC Role / Device Role / Timing Role: Wide-input buck-boost controller operating in buck-boost region with 2MHz switching to minimize filter size. Use Value: Maintains regulation without output sag during transient dips; spread spectrum reduces conducted EMI on shared backplane. |
Use Scenario: Bidirectional power conversion between 12V system rail and 0–24V supercapacitor bank for ride-through during AC mains failure. IC Role / Device Role / Timing Role: Dual-role controller enabling charging (buck mode) and discharging (boost mode) with seamless transition at VIN = VOUT. Use Value: Single-inductor topology avoids polarity reversal circuitry; ±1.5% VOUT accuracy ensures precise capacitor voltage clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-switch buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780 | Fixed 100kHz–600kHz range; no spread spectrum; lower max input (40V); no ISP/ISN current monitor | Lacks automotive temp grade and integrated current sensing - suited for non-automotive industrial supplies only | Select LTC3780 only if 600kHz max frequency and absence of EMI spread spectrum are acceptable |
| MPQ4332-AEC1 | Integrated MOSFETs (40V max); fixed 2.2MHz; no ISP/ISN monitor; ±2% VOUT accuracy | Not suitable for >40V input or precision current telemetry; limited to lower-power (<15W) applications | Choose MPQ4332-AEC1 only for space-constrained, lower-voltage automotive modules where integration outweighs flexibility |
Compared with LTC3780 and MPQ4332-AEC1, the LT8390AHFE#TRPBF uniquely combines 60V rating, 2MHz capability, spread-spectrum EMI reduction, ISP/ISN current monitoring, and AEC-Q100 Grade H qualification - making it the only option for high-reliability, high-frequency, wide-input automotive and industrial buck-boost systems requiring precise current control.
Availability
LT8390AHFE#TRPBF is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial battery chargers, and telecom intermediate bus converters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8390AHFE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8390A product line delivers high-efficiency, wide-input-range buck-boost controllers optimized for automotive and industrial applications demanding robustness, EMI control, and seamless voltage crossover operation.
FAQ
What is the maximum junction temperature rating for the LT8390AHFE#TRPBF?
The LT8390AHFE#TRPBF is rated for continuous operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified to Grade H. This specification is explicitly confirmed in the Order Information table (Rev. C datasheet, Page 3) and Absolute Maximum Ratings (Page 2), distinguishing it from lower-grade variants (E/I/J). Thermal derating applies above 125°C per Note 2.
Does the LT8390AHFE#TRPBF support spread-spectrum frequency modulation?
Yes, the LT8390AHFE#TRPBF supports triangle spread-spectrum modulation with 21–25% frequency deviation above the base oscillator frequency when the SYNC/SPRD pin is tied to INTVCC. This feature is documented in the FEATURES section (Page 1), Electrical Characteristics (Page 6), and PIN FUNCTIONS (Page 12), and directly reduces peak EMI emissions in automotive and industrial environments.
How does the LT8390AHFE#TRPBF handle transitions between buck, buck-boost, and boost regions?
The LT8390AHFE#TRPBF uses proprietary peak-buck/peak-boost current mode control with hysteresis to ensure seamless, low-noise transitions. Region boundaries are defined by VIN/VOUT ratios: buck (≤0.77), buck-boost (0.77–1.35), and boost (≥1.31), as specified in the Electrical Characteristics table (Page 6). No output disturbance occurs during crossover, verified in Typical Performance waveforms (Pages 7–8).
Can the LT8390AHFE#TRPBF regulate both input and output current?
Yes, the LT8390AHFE#TRPBF provides dedicated ISP/ISN inputs for precise input or output current regulation and monitoring, with ±3% accuracy. The CTRL pin programs the current sense threshold from 5mV to 100mV, and ISMON outputs 10×(VISP–VISN) + 0.25V. These functions are fully detailed in the Electrical Characteristics (Page 5) and PIN FUNCTIONS (Page 11–12).
What package and pin count does the LT8390AHFE#TRPBF use?
The LT8390AHFE#TRPBF uses a 28-lead plastic TSSOP package with exposed pad (FE package), as confirmed in the ORDER INFORMATION table (Page 3) and PIN CONFIGURATION diagrams (Page 2). Pin 29 is the exposed pad, which must be soldered to PCB ground for thermal and electrical performance - not a signal pin.
LT8390AHFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 645kHz ~ 2.1MHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8390AHFE#TRPBF FAQ
1.How can I place an order for LT8390AHFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8390AHFE#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 LT8390AHFE#TRPBF reliable?
The price and inventory of LT8390AHFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8390AHFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8390AHFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8390AHFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8390AHFE#TRPBF?
LT8390AHFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8390AHFE#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 LT8390AHFE#TRPBF?
For technical support, including LT8390AHFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8390AHFE#TRPBF requirements.
6.How does Aetrix verify that LT8390AHFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8390AHFE#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 LT8390AHFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8390AHFE#TRPBF?
All LT8390AHFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8390AHFE#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 LT8390AHFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8390AHFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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