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Analog Devices Inc. LT3697EMSE#PBF
- Part No.:
- LT3697EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3697EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LT3697EMSE#PBF from Analog Devices (formerly Linear Technology) is a 35V input, 2.5A synchronous step-down DC/DC converter optimized for USB 5V power delivery with cable drop compensation. It maintains precise 5V regulation at the remote USB socket across long cables (e.g., 4m AWG20), features programmable current limiting (up to 2.5A), active load transient suppression (180mA), and dual feedback for USB switch integration. Used in automotive infotainment head units requiring robust 5V bus power.
For engineers reviewing the LT3697EMSE#PBF datasheet, LT3697EMSE#PBF pinout, LT3697EMSE#PBF application, or LT3697EMSE#PBF equivalent, key selection criteria include its 300kHz–2.2MHz adjustable switching frequency, 60V input transient tolerance, 16-lead MSOP package with exposed pad, ±0.1% USB5V output accuracy, and integrated FLT fault flag with 1.5ms deglitching - all critical for USB-C power delivery in harsh environments.
Technical Context
The LT3697EMSE#PBF employs a current-mode control architecture with three independent feedback paths: USB5V (primary 5V regulation), SYS (6.1V overvoltage clamp and auxiliary supply), and ISP/ISN (current-sense amplifier for programmable limit). Its oscillator supports external RT resistor programming and synchronization up to 2.2MHz, enabling EMI optimization.
It integrates an 180mA active load tied to the SYS pin to suppress output overshoot during fast load transients and maintain BST capacitor charge during startup. Cable drop compensation is implemented via RCBL pin current sourcing proportional to VISP–VISN, enabling dynamic VOUT boost without Kelvin sensing - capped at 6.1V by SYS regulation to protect downstream USB devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 35V continuous; withstands 60V non-repetitive transients - enables direct battery connection in 12V/24V automotive systems. |
| Output Current | 2.5A maximum continuous - sufficient for dual-port USB charging or USB hub + controller power. |
| USB5V Accuracy | ±0.1% (4.95V–5.03V at 25°C) - ensures compliance with USB 2.0/3.0 voltage tolerance at point-of-load. |
| Switching Frequency | 300kHz to 2.2MHz (RT-programmable) - allows trade-off between efficiency (lower fSW) and size/EMI (higher fSW). |
| Cable Drop Compensation | Programmable up to 1.1V offset (max VOUT = 6.1V) - compensates for ≥0.26Ω cable resistance at full load. |
| Current Limit Accuracy | ±2% typical (via RLIM pin and RSENSE) - eliminates need for external USB power switch in many designs. |
| Shutdown Current | <1µA - meets automotive "always-on" low-power requirements during vehicle sleep mode. |
Pinout & Package
LT3697EMSE#PBF is housed in a thermally enhanced 16-lead MSOP package (MSE) with exposed pad (Pin 17) soldered to PCB ground for low θJA (40°C/W). The exposed pad is electrically connected to GND and mandatory for thermal performance and reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2) | Main power input | Supplies internal regulator and NPN switch; requires local ceramic bypassing; rated to 60V transient. |
| EN (3) | Enable control | Active-high logic input (2.5V threshold); <1µA shutdown current when pulled low. |
| FLT (4) | Fault indicator | Open-drain output asserting low after 1.5ms sustained overcurrent; resets after 1.5ms below threshold. |
| SYNC (5) | External clock input | Accepts 300kHz–2.2MHz square wave for EMI reduction; ties to GND if unused. |
| RT (6) | Oscillator frequency set | Resistor-to-GND sets switching frequency; 22.1k → 2MHz, 453k → 350kHz. |
| VC (7) | Error amplifier output | Compensation node; connects to R-C network for loop stability; clamped at 1.8V. |
| RLIM (8) | Current limit reference | 11µA internal pull-up; resistor-to-GND programs current limit threshold (e.g., 29.4k → 2.1A). |
| RCBL (9) | Cable compensation control | Sources current proportional to VISP–VISN; resistor-to-GND sets compensation gain for RCDC ratio. |
| ISN (10) | Inverting current sense | Connects to low-side of RSENSE; differential input with ISP forms current monitor path. |
| ISP (11) | Non-inverting current sense | Connects to high-side of RSENSE; referenced to USB output or USB switch output. |
| USB5V (12) | Main feedback input | Regulated to 5.00V ±0.1%; also sources current for cable compensation via RCDC. |
| SYS (13) | Auxiliary feedback & supply | Regulated to 6.1V max; powers internal bias and external circuitry (e.g., USB hub controller); sinks 180mA active load. |
| BST (14) | Bootstrap drive | Drives internal NPN switch gate above VIN; requires external 10nF ceramic capacitor to SW. |
| SW (15,16) | Power switch output | Connects to inductor, catch diode, and BST capacitor; handles peak 6.7A switch current. |
| GND (17) | Ground / Exposed Pad | Primary signal and thermal ground; exposed pad must be soldered to PCB for thermal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual feedback regulation (USB5V + SYS) | Enables regulation at USB switch output while limiting VOUT to 6.1V for fault protection - avoids overvoltage damage to downstream ICs. |
| Programmable cable drop compensation | Compensates up to 1.1V drop using RCBL/RCDC/RSENSE ratio - maintains 5V at load without Kelvin wiring or complex compensation networks. |
| Integrated 180mA active load | Drawn from SYS pin to suppress output overshoot during 25mA/µs load steps - improves transient response without external components. |
| Accurate, programmable current limit | ±2% typical accuracy via RLIM pin; eliminates discrete USB power switch and reduces BOM count in automotive USB ports. |
| 1.5ms FLT deglitching | Filters hot-plug events and brief inrush currents - prevents false fault latching during normal USB device insertion. |
| 60V input transient tolerance | Withstands load-dump pulses per ISO 7637-2 without external TVS - simplifies front-end protection in automotive applications. |
Applications
| Automotive USB Charging Port | Industrial USB Hub Power |
|---|---|
|
Use Scenario: Powering dual USB-A ports in a vehicle head unit with 4m cable runs to rear-seat connectors. IC Role / Device Role / Timing Role: Primary 5V buck regulator with cable drop compensation and overcurrent fault signaling. Use Value: Maintains 5.00V ±0.05V at USB socket under 2.5A load despite 0.26Ω cable resistance - meets USB BC1.2 specification without external sensing. |
Use Scenario: Providing regulated 5V to a 4-port industrial USB 3.0 hub mounted remotely from the host controller. IC Role / Device Role / Timing Role: Point-of-load DC/DC converter with active load and dual feedback for switch-integrated topology. Use Value: SYS pin supplies 5V to hub controller while USB5V regulates at port; FLT flag triggers system-level fault logging on overcurrent. |
| USB-Powered Test Equipment | Ruggedized Tablet Docking Station |
|
Use Scenario: Powering handheld test instruments via USB-C PD sink emulation with local 5V generation. IC Role / Device Role / Timing Role: High-accuracy, low-noise 5V source with programmable current limit and transient immunity. Use Value: 0.1% output accuracy and 180mA active load ensure stable 5V supply during instrument self-test sequences with rapid load changes. |
Use Scenario: Docking station delivering 5V/2.5A to tablet via 3m shielded cable while supporting hot-plug detection. IC Role / Device Role / Timing Role: Cable-compensated buck regulator with 1.5ms FLT deglitching and 60V transient survival. Use Value: Compensates for voltage drop across docking connector and cable; FLT flag disables charging on short-circuit - prevents thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB 5V buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIV#PBF | 42V input, 3A, Silent Switcher® architecture; no integrated cable compensation or dual feedback; requires external current sense. | Better EMI performance but lacks native USB cable drop compensation and SYS-based overvoltage clamp. | Select when ultra-low EMI is critical and cable compensation can be implemented externally or is unnecessary. |
| TPS62130ARGTR | 6V input max, 3A, fixed 5V output; no cable compensation, no current limit programming, no FLT flag; smaller 16-pin QFN. | Lower cost and size for simple 5V loads where input is stabilized and cable length is negligible. | Select only for non-automotive, short-cable (<0.5m), fixed-input applications with no fault reporting requirement. |
Compared with LT8609SIV#PBF and TPS62130ARGTR, the LT3697EMSE#PBF uniquely integrates cable drop compensation, dual feedback for USB switch integration, and a dedicated FLT fault flag - making it the only option among the three qualified for automotive USB charging with >2m cable runs and system-level fault handling.
Availability
LT3697EMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial USB hubs, and ruggedized docking stations requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term lifecycle support.
Supply support for LT3697EMSE#PBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, and communications markets.
The LT3697EMSE#PBF belongs to Linear's legacy high-voltage monolithic buck regulator family, designed specifically for robust 5V USB power delivery in automotive and industrial environments with long cable runs and stringent fault tolerance requirements.
FAQ
What is the maximum cable resistance the LT3697EMSE#PBF can compensate for?
The LT3697EMSE#PBF supports cable drop compensation up to 1.1V (6.1V – 5.0V), which corresponds to ~0.26Ω at 2.5A load when using standard RSENSE values (e.g., 22mΩ). This is validated in the datasheet's Figure 1 load line with RCABLE = 0.26Ω, RCBL = 16.5k, and RCDC = 10k. Compensation beyond this requires verifying SYS pin regulation margin and stability with CCDC adjustment.
Can the LT3697EMSE#PBF operate without cable drop compensation?
Yes - the LT3697EMSE#PBF operates as a standard 5V buck regulator when RCBL is left floating and USB5V is tied directly to the output. In this configuration, USB5V is regulated precisely to 5.00V ±0.1%, and all other features (current limit, FLT flag, SYS auxiliary supply) remain fully functional. No reconfiguration of RLIM or RCDC is required.
How does the FLT pin behave during startup or low-VIN conditions?
The FLT pin is only valid when VIN > 4V and EN is high. If VIN drops below 4V or EN is low, the FLT latch resets and the pin goes high-impedance. During startup, FLT remains inactive until regulation is established; it asserts low only after ≥1.5ms of sustained overcurrent (≥99.5% of programmed limit), preventing false triggering from inrush.
What is the role of the SYS pin beyond auxiliary power supply?
Beyond powering auxiliary circuitry (e.g., USB hub controllers), the SYS pin serves two critical control functions in the LT3697EMSE#PBF: (1) it acts as a second feedback input enabling regulation at the output of a USB switch, and (2) it is clamped to 6.1V maximum to prevent overvoltage damage during cable compensation faults or open-switch conditions - a safety feature absent in most standard buck regulators.
Is the LT3697EMSE#PBF pin-compatible with other members of the LT3697 family?
Yes - the LT3697EMSE#PBF shares identical pinout, package (16-lead MSOP), and electrical interface with LT3697IMSE#PBF and LT3697HMSE#PBF. The only difference is temperature grade: EMSE#PBF is rated for –40°C to 125°C junction, matching the I-grade version. All share identical absolute maximum ratings, timing, and feature set.
LT3697EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 6.1V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 300kHz ~ 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3697EMSE#PBF FAQ
1.How can I place an order for LT3697EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3697EMSE#PBF 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 LT3697EMSE#PBF reliable?
The price and inventory of LT3697EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3697EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3697EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3697EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3697EMSE#PBF?
LT3697EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3697EMSE#PBF 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 LT3697EMSE#PBF?
For technical support, including LT3697EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3697EMSE#PBF requirements.
6.How does Aetrix verify that LT3697EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3697EMSE#PBF 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 LT3697EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3697EMSE#PBF?
All LT3697EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3697EMSE#PBF, 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 LT3697EMSE#PBF part is unused and in its original packaging.
Return procedure for LT3697EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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