ChongMing Group (HK) Int'l Co., Ltd
CHONGMING GROUP (HK) INT'L CO., LTD.
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LT3980EDE#TRPBF Power Path Management IC Switching Voltage Regulators 58V, 2A, 2.4MHz Step-Down Switching Regulator with
FeaTures
Wide Input Range: Operation from 3.6V to 58V
Overvoltage Lockout Protects Circuits Through 80V
Transients
2A Maximum Output Current
Low Ripple (<15mVP-P) Burst Mode® Operation:
IQ = 85μA at 12VIN to 3.3VOUT
Adjustable Switching Frequency: 100kHz to 2.4MHz
Low Shutdown Current: IQ < 1μA
Catch Diode Current Sense Protects Circuit Through
Short-Circuit and Input Overvoltage
Synchronizable Between 250kHz to 2MHz
Power Good Flag
Saturating Switch Design: 200mΩ On-Resistance
Thermal Protection
Soft-Start Capability
Small 16-Pin Thermally Enhanced MSOP and
3mm × 4mm DFN Packages
ApplicaTions
Automotive Battery Regulation
Distributed Supply Regulation
Industrial Supplies
DescripTion
The LT®3980 is an adjustable frequency (100kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 58V (80V transient). A high ef ciency 200mΩ switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Catch diode current sense (DA pin) protects the circuit during input voltage transients even when a high switching frequency is used. Low ripple Burst Mode operation maintains high ef ciency at low output currents while keeping output ripple below 15mV in a typical application. In addition, the LT3980 can further enhance low output current ef ciency by drawing bias current from the output when VOUT is above 3V. Shutdown reduces input supply current to less than 1μA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good ag signals when VOUT reaches 91% of the programmed output voltage. The LT3980 is available in 16-pin MSOP and 3mm × 4mm DFN packages with exposed pads for low thermal resistance.