ST L5987

降压降压2.9V18V3A

Overview

The L5987 is a step-down switching regulator with a 3.5 A (minimum) current limited embedded Power MOSFET, so it is able to deliver an up to 3 A current to the load depending on the application conditions.

The input voltage can range from 2.9 V to 18 V, while the output voltage can be set starting from 0.6 V to VIN. Having a minimum input voltage of 2.9 V, the device is suitable also for a 3.3 V bus. Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz. The VFQFPN8 and the HSOP packages with an exposed pad allow reducing the RthJAdown to 60 °C/W and 40 °C/W respectively.

Features

Tube Package
Positive Output Configuration
Buck Topology
Adjustable Output Type
1 Number of Outputs
2.9V Voltage - Input (Min)
18V Voltage - Input (Max)
0.6V Voltage - Output (Min/Fixed)
18V Voltage - Output (Max)
3A Current - Output
250kHz ~ 1MHz Frequency - Switching
No Synchronous Rectifier
Surface Mount Mounting Type

Applications

· 3 A DC output current

· 2.9 V to 18 V input voltage

· Output voltage adjustable from 0.6 V

· 250 kHz switching frequency, programmable

up to 1 MHz

· Internal soft-start and inhibit

· Low dropout operation: 100% duty cycle

· Voltage feedforward

· Zero load current operation

· Overcurrent and thermal protection

· VFQFPN 3 x 3 -8L and HSOP8 package

L5987  Applications

· Consumer: STB, DVD, DVD recorder, car

audio, LCD TV and monitors

 Industrial: PLD, PLA, FPGA, chargers

· Networking: XDSL, modems, DC-DC modules

· Computer: optical storage, hard disk drive,

printers, audio/graphic cards

· LED driving