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STMicroelectronics L5987

3 A step-down switching regulator

Overview

TopologyBuck Converter
Input voltage2.9-18 V
Switching frequency250-1000 kHz
Output 12.9 V / 2 A
IC revision4

Description

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

  • 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

Typical applications

  • Industrial: PLD, PLA, FPGA, chargers
  • Computer: optical storage, hard disk drive,
  • Consumer: STB, DVD, DVD recorder, car
  • Networking: XDSL, modems, DC-DC modules
  • LED driving

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples
7447714022SPEC
7 files WE-PD SMT Power Inductor 2.2 8.6 9.5 6.8 8 53 1050 Performance
7447714033SPEC
7 files WE-PD SMT Power Inductor 3.3 7.5 9 8.9 10.5 42 1050 Performance
7447714047SPEC
7 files WE-PD SMT Power Inductor 4.7 7 8 10.4 12.4 34 1050 Performance
7447713082SPEC
7 files WE-PD SMT Power Inductor 8.2 3 4.7 41 49 30 1030 Performance
7447713100SPEC
7 files WE-PD SMT Power Inductor 10 2.6 4.1 52 62 25 1030 Performance
7447713150SPEC
7 files WE-PD SMT Power Inductor 15 2.2 3.4 74 89 19.5 1030 Performance
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples