Datasheet LT3697 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | USB 5V, 2.5A Output, 35V Input Buck with Cable Drop Compensation |
| Pages / Page | 32 / 1 — FeaTures. DescripTion. Accurate 5V Output. Programmable Cable Drop … |
| File Format / Size | PDF / 451 Kb |
| Document Language | English |
FeaTures. DescripTion. Accurate 5V Output. Programmable Cable Drop Compensation. Programmable Output Current Limit
Model Line for this Datasheet
Text Version of Document
LT3697 USB 5V, 2.5A Output, 35V Input Buck with Cable Drop Compensation
FeaTures DescripTion
n
Accurate 5V Output
The LT®3697 is a 35V, 2.5A step-down switching regulator n
Programmable Cable Drop Compensation
designed to power 5V USB applications. A precise output n
Programmable Output Current Limit
voltage and programmable cable drop compensation n
Adjustable Output from 5.0V to 6.1V
maintain accurate 5V regulation at the USB socket connected n
Dual Input Feedback Permits Regulation on Output
to the end of a long cable. The accurate, programmable
of USB Switch
current limit can eliminate the need for a USB power switch n
Active Load Reduces Output Overshoot
and improve system reliability. The provided 180mA active n FLT Flag Indicates Overcurrent on the USB Output load reduces output overshoot during load transients. Dual n 1.5ms FLT Flag Delay Filters Hot Plug Events feedback allows regulation on the output of a USB switch n USB Output Current Monitor and limits cable drop compensation to a maximum of 6.1V n Wide Input Rage: Operation from 5V to 35V output, protecting USB devices during fault conditions. A n Withstands Input Transient to 60V separate 5V output can be taken from the SYS terminal n 2.5A Maximum Output Current to power auxiliary circuitry such as a USB hub controller. n Survives Output Short to GND and Car Battery The LT3697 also provides a load current monitor output n Adjustable Switching Frequency: 300kHz to 2.2MHz and an overcurrent fault indicator. n Synchronizable from 300kHz to 2.2MHz The LT3697 operates from 300kHz to 2.2MHz and with- n Small, Thermally Enhanced 16-Lead MSOP Package stands input voltage transients up to 60V. The device's output survives shorts to ground and to the battery. A current
applicaTions
mode topology is used for fast transient response and good n Automotive USB loop stability. Shutdown reduces input supply current to n Industrial USB less than 1µA. The LT3697 is available in a 16-lead MSOP package with an exposed pad for low thermal resistance. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion 5V Step-Down Converter with Cable Drop Compensation and Output Current Limit Transient Response
V 5.75 6.0 IN 6V TO 35V 4 METERS AWG 20 TRANSIENT TO 60V VOUT TWISTED PAIR CABLE 10µF 1µF V 0.022Ω OUT V 0.13Ω IN BST 5.50 5.0 EN SW 10µH LT3697 47µF 10nF 10k CURRENT (A) 5.25 4.0 + V FLT SYS LOAD RT ISP VLOAD 5.00 3.0 VC ISN LOAD 5V, 2.5A VOLTAGE (V) RLIM USB5V 255k 7.5k I SYNC RCBL – LOAD + 4.75 2.0 330pF 1nF 25mA/µs GND 16.5k 100µF 0.13Ω 4.50 1.0 3697 TA01 250µs/DIV 3697 TA01a 3697f 1 For more information www.linear.com/LT3697
FeaTures DescripTion
n
Accurate 5V Output
The LT®3697 is a 35V, 2.5A step-down switching regulator n
Programmable Cable Drop Compensation
designed to power 5V USB applications. A precise output n
Programmable Output Current Limit
voltage and programmable cable drop compensation n
Adjustable Output from 5.0V to 6.1V
maintain accurate 5V regulation at the USB socket connected n
Dual Input Feedback Permits Regulation on Output
to the end of a long cable. The accurate, programmable
of USB Switch
current limit can eliminate the need for a USB power switch n
Active Load Reduces Output Overshoot
and improve system reliability. The provided 180mA active n FLT Flag Indicates Overcurrent on the USB Output load reduces output overshoot during load transients. Dual n 1.5ms FLT Flag Delay Filters Hot Plug Events feedback allows regulation on the output of a USB switch n USB Output Current Monitor and limits cable drop compensation to a maximum of 6.1V n Wide Input Rage: Operation from 5V to 35V output, protecting USB devices during fault conditions. A n Withstands Input Transient to 60V separate 5V output can be taken from the SYS terminal n 2.5A Maximum Output Current to power auxiliary circuitry such as a USB hub controller. n Survives Output Short to GND and Car Battery The LT3697 also provides a load current monitor output n Adjustable Switching Frequency: 300kHz to 2.2MHz and an overcurrent fault indicator. n Synchronizable from 300kHz to 2.2MHz The LT3697 operates from 300kHz to 2.2MHz and with- n Small, Thermally Enhanced 16-Lead MSOP Package stands input voltage transients up to 60V. The device's output survives shorts to ground and to the battery. A current
applicaTions
mode topology is used for fast transient response and good n Automotive USB loop stability. Shutdown reduces input supply current to n Industrial USB less than 1µA. The LT3697 is available in a 16-lead MSOP package with an exposed pad for low thermal resistance. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion 5V Step-Down Converter with Cable Drop Compensation and Output Current Limit Transient Response
V 5.75 6.0 IN 6V TO 35V 4 METERS AWG 20 TRANSIENT TO 60V VOUT TWISTED PAIR CABLE 10µF 1µF V 0.022Ω OUT V 0.13Ω IN BST 5.50 5.0 EN SW 10µH LT3697 47µF 10nF 10k CURRENT (A) 5.25 4.0 + V FLT SYS LOAD RT ISP VLOAD 5.00 3.0 VC ISN LOAD 5V, 2.5A VOLTAGE (V) RLIM USB5V 255k 7.5k I SYNC RCBL – LOAD + 4.75 2.0 330pF 1nF 25mA/µs GND 16.5k 100µF 0.13Ω 4.50 1.0 3697 TA01 250µs/DIV 3697 TA01a 3697f 1 For more information www.linear.com/LT3697
