Datasheet LT8698S, LT8698S-1 (Analog Devices) - 9

LT8698S/LT8698S-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VIN = 12V unless otherwise noted. Switching Frequency Switching Frequency vs Load Current Switch Rising Edge Soft-Start vs Time Soft–Start vs Time
2.40 2.00 1.60 VBUS 1V/DIV VSW IBUS = 0A 1.20 2V/DIV 0.80 VIN = 12V IBUS = 2A SWITCHING FREQUENCY (MHz) 0.40 1ns/DIV 8698S G20 200µs/DIV 8698S G21 SYNC/MODE = FLOAT SYNC/MODE = LOW 0 0 0.5 1 1.5 2 2.5 IBUS CURRENT (A) 8698S G19
Minimum V Minimum V IN for Full Frequency Regulation @ 2MHz with 400m IN for Full Frequency
Ω
Load T Load T ransient Response Through Regulation @ 2MHz with 400mΩ ransient Response Start-Up/Dropout Start–Up / Dropout Cable Drop Compensation Cable Drop Comp Cable Through Cable
8.0 6.00 4.0 IBUS = 0A VIN @ IBUS = 2.5A FRONT PAGE CIRCUIT V 5.75 CABLE = 3m AWG24 3.5 IN 400mΩ CABLE COMP 7.5 L = XAL5030–222 CLOAD = 0µF R 5.50 3.0 SEN = 10mΩ 7.0 V VBUS CURRENT (A) 2V/DIV IN @ IBUS = 1A 5.25 2.5 6.5 5.00 2.0 VBUS TAGE (V) TAGE (V) VBUS @ IBUS = 2.5A VOL VOL 4.75 1.5 6.0 VLOAD 4.50 1.0 V I BUS @ IBUS = 1A BUS 5.5 25mA/µs 4.25 0.5 10ms/DIV 8698S G22 5.0 4.00 0 –50 –25 0 25 50 75 100 125 150 40µs/DIV 8698S G24 TEMPERATURE (°C) 8698S G23
Load T Load T ransient Response Through ransient Response USB5V (Feedback) Shorted to Cable Through Cable Output Current Limit Transient Output Current Limit T Ground Transient FB Shorted to Ground
6.00 4.0 VBUS 5.75 3.5 VBUS 5.50 3.0 RSEN = 10mΩ CURRENT (A) 1V/DIV 5.25 2.5 R V CDC = 0Ω BUS VLOAD 2V/DIV 5.00 2.0 TAGE (V) VOL 4.75 1.5 VBUS VBUS VUSB5V OVERLOAD OVERLOAD 4.50 1.0 FRONT PAGE CIRCUIT APPLIED RELEASED I I BUS BUS = 1A FRONT PAGE CIRCUIT IBUS 4.25 25mA/µs CABLE = 3m AWG 0.5 1A/DIV 8698S G27 1ms/DIV 8698S G26 10µs/DIV CLOAD = 0µF 4.00 0 40µs/DIV 8698S G25 Rev. A For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Related Parts