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reference designL5985

STMicroelectronics L5985

2 A step-down switching regulator

Overview

TopologyBuck Converter
Input voltage3.3-18 V
Switching frequency250-1000 kHz
Output 13.3 V / 2 A
IC revision6

Description

The L5985 is a step-down switching regulator with a 2.5 A (min.) current limited embedded Power MOSFET, so it is able to deliver up to 2 A DC current to the load depending on the application condition.

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 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 externallyadjusted up to 1 MHz.The VFQFPN8 package with an exposed pad allows reducing the RthJA down to approximately 60 °C/W.

Features

  • 2 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
  • VFQFPN8 3 mm x 3 mm package

Remarks

  • Inductor value 15uH is added from design example, refer page number 21.
  • Suggested inductor value ranges is also given in table in 7.
  • Another 15uH inductor inductor is added from A VERY COMPACT NEW MONOLITHIC STEP-DOWN REGULATOR MANAGES HIGH CURRENT CONVERSIONS
  • Output current to be taken from general value. i.e 2A
  • Some of the Product and series to be added nearest inductor values rangesREMARKS:-TABLE 7 INDUCTOR

Typical applications

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

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
RDC max.(mΩ)
fres(MHz)
Size
Version
SamplesAvailability & Sample
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7447779006
SPECWE-PD SMT Power Inductor, 6.8 µH, 4.25 A

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PD SMT Power Inductor
Inductance6.8 µH
Performance Rated Current4.25 A
DC Resistance35 mΩ
Self Resonant Frequency32 MHz
Size7345 
VersionRobust 
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